Extracting prog: 1m32.898144726s Minimizing prog: 11m19.248321992s Simplifying prog options: 0s Extracting C: 26.335908645s Simplifying C: 5m20.425403712s extracting reproducer from 1 programs testing a last program of every proc single: executing 1 programs separately with timeout 30s testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event detailed listing: executing program 0: r0 = syz_open_dev$tty20(0xc, 0x4, 0x0) ioctl$VT_ACTIVATE(r0, 0x5606, 0x14) ioctl$KDSKBENT(r0, 0x4b47, &(0x7f0000000000)={0x0, 0x1c, 0x20f}) r1 = openat$uinput(0xffffffffffffff9c, &(0x7f0000000040), 0x2, 0x0) ioctl$UI_SET_EVBIT(r1, 0x40045564, 0x1) ioctl$UI_SET_KEYBIT(r1, 0x40045565, 0x1c) ioctl$UI_DEV_SETUP(r1, 0x405c5503, &(0x7f0000000080)={{}, 'syz0\x00', 0x1}) ioctl$UI_DEV_CREATE(r1, 0x5501) write$input_event(r1, &(0x7f0000000100)={{}, 0x1, 0x1c, 0x1}, 0x18) program crashed: possible deadlock in n_tty_flush_buffer single: successfully extracted reproducer found reproducer with 9 syscalls minimizing guilty program testing program (duration=44.577580606s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE detailed listing: executing program 0: r0 = syz_open_dev$tty20(0xc, 0x4, 0x0) ioctl$VT_ACTIVATE(r0, 0x5606, 0x14) ioctl$KDSKBENT(r0, 0x4b47, &(0x7f0000000000)={0x0, 0x1c, 0x20f}) r1 = openat$uinput(0xffffffffffffff9c, &(0x7f0000000040), 0x2, 0x0) ioctl$UI_SET_EVBIT(r1, 0x40045564, 0x1) ioctl$UI_SET_KEYBIT(r1, 0x40045565, 0x1c) ioctl$UI_DEV_SETUP(r1, 0x405c5503, &(0x7f0000000080)={{}, 'syz0\x00', 0x1}) ioctl$UI_DEV_CREATE(r1, 0x5501) program did not crash testing program (duration=44.577580606s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-write$input_event detailed listing: executing program 0: r0 = syz_open_dev$tty20(0xc, 0x4, 0x0) ioctl$VT_ACTIVATE(r0, 0x5606, 0x14) ioctl$KDSKBENT(r0, 0x4b47, &(0x7f0000000000)={0x0, 0x1c, 0x20f}) r1 = openat$uinput(0xffffffffffffff9c, &(0x7f0000000040), 0x2, 0x0) ioctl$UI_SET_EVBIT(r1, 0x40045564, 0x1) ioctl$UI_SET_KEYBIT(r1, 0x40045565, 0x1c) ioctl$UI_DEV_SETUP(r1, 0x405c5503, &(0x7f0000000080)={{}, 'syz0\x00', 0x1}) write$input_event(r1, &(0x7f0000000100)={{}, 0x1, 0x1c, 0x1}, 0x18) program did not crash testing program (duration=44.577580606s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_CREATE-write$input_event detailed listing: executing program 0: r0 = syz_open_dev$tty20(0xc, 0x4, 0x0) ioctl$VT_ACTIVATE(r0, 0x5606, 0x14) ioctl$KDSKBENT(r0, 0x4b47, &(0x7f0000000000)={0x0, 0x1c, 0x20f}) r1 = openat$uinput(0xffffffffffffff9c, &(0x7f0000000040), 0x2, 0x0) ioctl$UI_SET_EVBIT(r1, 0x40045564, 0x1) ioctl$UI_SET_KEYBIT(r1, 0x40045565, 0x1c) ioctl$UI_DEV_CREATE(r1, 0x5501) write$input_event(r1, &(0x7f0000000100)={{}, 0x1, 0x1c, 0x1}, 0x18) program did not crash testing program (duration=44.577580606s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event detailed listing: executing program 0: r0 = syz_open_dev$tty20(0xc, 0x4, 0x0) ioctl$VT_ACTIVATE(r0, 0x5606, 0x14) ioctl$KDSKBENT(r0, 0x4b47, &(0x7f0000000000)={0x0, 0x1c, 0x20f}) r1 = openat$uinput(0xffffffffffffff9c, &(0x7f0000000040), 0x2, 0x0) ioctl$UI_SET_EVBIT(r1, 0x40045564, 0x1) ioctl$UI_DEV_SETUP(r1, 0x405c5503, &(0x7f0000000080)={{}, 'syz0\x00', 0x1}) ioctl$UI_DEV_CREATE(r1, 0x5501) write$input_event(r1, &(0x7f0000000100)={{}, 0x1, 0x1c, 0x1}, 0x18) program did not crash testing program (duration=44.577580606s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event detailed listing: executing program 0: r0 = syz_open_dev$tty20(0xc, 0x4, 0x0) ioctl$VT_ACTIVATE(r0, 0x5606, 0x14) ioctl$KDSKBENT(r0, 0x4b47, &(0x7f0000000000)={0x0, 0x1c, 0x20f}) r1 = openat$uinput(0xffffffffffffff9c, &(0x7f0000000040), 0x2, 0x0) ioctl$UI_SET_KEYBIT(r1, 0x40045565, 0x1c) ioctl$UI_DEV_SETUP(r1, 0x405c5503, &(0x7f0000000080)={{}, 'syz0\x00', 0x1}) ioctl$UI_DEV_CREATE(r1, 0x5501) write$input_event(r1, &(0x7f0000000100)={{}, 0x1, 0x1c, 0x1}, 0x18) program did not crash testing program (duration=44.577580606s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event detailed listing: executing program 0: r0 = syz_open_dev$tty20(0xc, 0x4, 0x0) ioctl$VT_ACTIVATE(r0, 0x5606, 0x14) ioctl$KDSKBENT(r0, 0x4b47, &(0x7f0000000000)={0x0, 0x1c, 0x20f}) ioctl$UI_SET_EVBIT(0xffffffffffffffff, 0x40045564, 0x1) ioctl$UI_SET_KEYBIT(0xffffffffffffffff, 0x40045565, 0x1c) ioctl$UI_DEV_SETUP(0xffffffffffffffff, 0x405c5503, &(0x7f0000000080)={{}, 'syz0\x00', 0x1}) ioctl$UI_DEV_CREATE(0xffffffffffffffff, 0x5501) write$input_event(0xffffffffffffffff, &(0x7f0000000100)={{}, 0x1, 0x1c, 0x1}, 0x18) program did not crash testing program (duration=44.577580606s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event detailed listing: executing program 0: r0 = syz_open_dev$tty20(0xc, 0x4, 0x0) ioctl$VT_ACTIVATE(r0, 0x5606, 0x14) r1 = openat$uinput(0xffffffffffffff9c, &(0x7f0000000040), 0x2, 0x0) ioctl$UI_SET_EVBIT(r1, 0x40045564, 0x1) ioctl$UI_SET_KEYBIT(r1, 0x40045565, 0x1c) ioctl$UI_DEV_SETUP(r1, 0x405c5503, &(0x7f0000000080)={{}, 'syz0\x00', 0x1}) ioctl$UI_DEV_CREATE(r1, 0x5501) write$input_event(r1, &(0x7f0000000100)={{}, 0x1, 0x1c, 0x1}, 0x18) program did not crash testing program (duration=44.577580606s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event detailed listing: executing program 0: r0 = syz_open_dev$tty20(0xc, 0x4, 0x0) ioctl$KDSKBENT(r0, 0x4b47, &(0x7f0000000000)={0x0, 0x1c, 0x20f}) r1 = openat$uinput(0xffffffffffffff9c, &(0x7f0000000040), 0x2, 0x0) ioctl$UI_SET_EVBIT(r1, 0x40045564, 0x1) ioctl$UI_SET_KEYBIT(r1, 0x40045565, 0x1c) ioctl$UI_DEV_SETUP(r1, 0x405c5503, &(0x7f0000000080)={{}, 'syz0\x00', 0x1}) ioctl$UI_DEV_CREATE(r1, 0x5501) write$input_event(r1, &(0x7f0000000100)={{}, 0x1, 0x1c, 0x1}, 0x18) program did not crash testing program (duration=44.577580606s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event detailed listing: executing program 0: ioctl$VT_ACTIVATE(0xffffffffffffffff, 0x5606, 0x14) ioctl$KDSKBENT(0xffffffffffffffff, 0x4b47, &(0x7f0000000000)={0x0, 0x1c, 0x20f}) r0 = openat$uinput(0xffffffffffffff9c, &(0x7f0000000040), 0x2, 0x0) ioctl$UI_SET_EVBIT(r0, 0x40045564, 0x1) ioctl$UI_SET_KEYBIT(r0, 0x40045565, 0x1c) ioctl$UI_DEV_SETUP(r0, 0x405c5503, &(0x7f0000000080)={{}, 'syz0\x00', 0x1}) ioctl$UI_DEV_CREATE(r0, 0x5501) write$input_event(r0, &(0x7f0000000100)={{}, 0x1, 0x1c, 0x1}, 0x18) program did not crash testing program (duration=44.577580606s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event detailed listing: executing program 0: r0 = syz_open_dev$tty20(0xc, 0x4, 0x0) ioctl$VT_ACTIVATE(r0, 0x5606, 0x14) ioctl$KDSKBENT(r0, 0x4b47, 0x0) r1 = openat$uinput(0xffffffffffffff9c, &(0x7f0000000040), 0x2, 0x0) ioctl$UI_SET_EVBIT(r1, 0x40045564, 0x1) ioctl$UI_SET_KEYBIT(r1, 0x40045565, 0x1c) ioctl$UI_DEV_SETUP(r1, 0x405c5503, &(0x7f0000000080)={{}, 'syz0\x00', 0x1}) ioctl$UI_DEV_CREATE(r1, 0x5501) write$input_event(r1, &(0x7f0000000100)={{}, 0x1, 0x1c, 0x1}, 0x18) program did not crash testing program (duration=44.577580606s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event detailed listing: executing program 0: r0 = syz_open_dev$tty20(0xc, 0x4, 0x0) ioctl$VT_ACTIVATE(r0, 0x5606, 0x14) ioctl$KDSKBENT(r0, 0x4b47, &(0x7f0000000000)={0x0, 0x1c, 0x20f}) r1 = openat$uinput(0xffffffffffffff9c, 0x0, 0x2, 0x0) ioctl$UI_SET_EVBIT(r1, 0x40045564, 0x1) ioctl$UI_SET_KEYBIT(r1, 0x40045565, 0x1c) ioctl$UI_DEV_SETUP(r1, 0x405c5503, &(0x7f0000000080)={{}, 'syz0\x00', 0x1}) ioctl$UI_DEV_CREATE(r1, 0x5501) write$input_event(r1, &(0x7f0000000100)={{}, 0x1, 0x1c, 0x1}, 0x18) program did not crash testing program (duration=44.577580606s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event detailed listing: executing program 0: r0 = syz_open_dev$tty20(0xc, 0x4, 0x0) ioctl$VT_ACTIVATE(r0, 0x5606, 0x14) ioctl$KDSKBENT(r0, 0x4b47, &(0x7f0000000000)={0x0, 0x1c, 0x20f}) r1 = openat$uinput(0xffffffffffffff9c, &(0x7f0000000040), 0x2, 0x0) ioctl$UI_SET_EVBIT(r1, 0x40045564, 0x1) ioctl$UI_SET_KEYBIT(r1, 0x40045565, 0x1c) ioctl$UI_DEV_SETUP(r1, 0x405c5503, 0x0) ioctl$UI_DEV_CREATE(r1, 0x5501) write$input_event(r1, &(0x7f0000000100)={{}, 0x1, 0x1c, 0x1}, 0x18) program did not crash testing program (duration=44.577580606s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event detailed listing: executing program 0: r0 = syz_open_dev$tty20(0xc, 0x4, 0x0) ioctl$VT_ACTIVATE(r0, 0x5606, 0x14) ioctl$KDSKBENT(r0, 0x4b47, &(0x7f0000000000)={0x0, 0x1c, 0x20f}) r1 = openat$uinput(0xffffffffffffff9c, &(0x7f0000000040), 0x2, 0x0) ioctl$UI_SET_EVBIT(r1, 0x40045564, 0x1) ioctl$UI_SET_KEYBIT(r1, 0x40045565, 0x1c) ioctl$UI_DEV_SETUP(r1, 0x405c5503, &(0x7f0000000080)={{}, 'syz0\x00', 0x1}) ioctl$UI_DEV_CREATE(r1, 0x5501) write$input_event(r1, 0x0, 0x0) program did not crash extracting C reproducer testing compiled C program (duration=44.577580606s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event program crashed: possible deadlock in n_tty_flush_buffer simplifying C reproducer testing compiled C program (duration=44.577580606s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event program crashed: possible deadlock in n_tty_flush_buffer testing compiled C program (duration=44.577580606s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event program did not crash testing compiled C program (duration=44.577580606s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event program did not crash testing compiled C program (duration=44.577580606s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event program crashed: possible deadlock in n_tty_flush_buffer testing compiled C program (duration=44.577580606s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event program crashed: possible deadlock in n_tty_flush_buffer testing compiled C program (duration=44.577580606s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event program crashed: possible deadlock in n_tty_flush_buffer testing compiled C program (duration=44.577580606s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event program crashed: possible deadlock in n_tty_flush_buffer testing compiled C program (duration=44.577580606s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event program crashed: possible deadlock in n_tty_flush_buffer testing program (duration=44.577580606s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event detailed listing: executing program 0: r0 = syz_open_dev$tty20(0xc, 0x4, 0x0) ioctl$VT_ACTIVATE(r0, 0x5606, 0x14) ioctl$KDSKBENT(r0, 0x4b47, &(0x7f0000000000)={0x0, 0x1c, 0x20f}) r1 = openat$uinput(0xffffffffffffff9c, &(0x7f0000000040), 0x2, 0x0) ioctl$UI_SET_EVBIT(r1, 0x40045564, 0x1) ioctl$UI_SET_KEYBIT(r1, 0x40045565, 0x1c) ioctl$UI_DEV_SETUP(r1, 0x405c5503, &(0x7f0000000080)={{}, 'syz0\x00', 0x1}) ioctl$UI_DEV_CREATE(r1, 0x5501) write$input_event(r1, &(0x7f0000000100)={{}, 0x1, 0x1c, 0x1}, 0x18) program crashed: possible deadlock in n_tty_flush_buffer validation run: crashed=true testing program (duration=44.577580606s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event detailed listing: executing program 0: r0 = syz_open_dev$tty20(0xc, 0x4, 0x0) ioctl$VT_ACTIVATE(r0, 0x5606, 0x14) ioctl$KDSKBENT(r0, 0x4b47, &(0x7f0000000000)={0x0, 0x1c, 0x20f}) r1 = openat$uinput(0xffffffffffffff9c, &(0x7f0000000040), 0x2, 0x0) ioctl$UI_SET_EVBIT(r1, 0x40045564, 0x1) ioctl$UI_SET_KEYBIT(r1, 0x40045565, 0x1c) ioctl$UI_DEV_SETUP(r1, 0x405c5503, &(0x7f0000000080)={{}, 'syz0\x00', 0x1}) ioctl$UI_DEV_CREATE(r1, 0x5501) write$input_event(r1, &(0x7f0000000100)={{}, 0x1, 0x1c, 0x1}, 0x18) program crashed: possible deadlock in n_tty_flush_buffer validation run: crashed=true testing program (duration=44.577580606s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$tty20-ioctl$VT_ACTIVATE-ioctl$KDSKBENT-openat$uinput-ioctl$UI_SET_EVBIT-ioctl$UI_SET_KEYBIT-ioctl$UI_DEV_SETUP-ioctl$UI_DEV_CREATE-write$input_event detailed listing: executing program 0: r0 = syz_open_dev$tty20(0xc, 0x4, 0x0) ioctl$VT_ACTIVATE(r0, 0x5606, 0x14) ioctl$KDSKBENT(r0, 0x4b47, &(0x7f0000000000)={0x0, 0x1c, 0x20f}) r1 = openat$uinput(0xffffffffffffff9c, &(0x7f0000000040), 0x2, 0x0) ioctl$UI_SET_EVBIT(r1, 0x40045564, 0x1) ioctl$UI_SET_KEYBIT(r1, 0x40045565, 0x1c) ioctl$UI_DEV_SETUP(r1, 0x405c5503, &(0x7f0000000080)={{}, 'syz0\x00', 0x1}) ioctl$UI_DEV_CREATE(r1, 0x5501) write$input_event(r1, &(0x7f0000000100)={{}, 0x1, 0x1c, 0x1}, 0x18) program crashed: possible deadlock in n_tty_flush_buffer validation run: crashed=true reproducing took 20m40.507590185s repro crashed as (corrupted=false): ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ kworker/1:4/5984 is trying to acquire lock: ffff88802cd722c8 (&tty->termios_rwsem){++++}-{4:4}, at: class_rwsem_write_constructor include/linux/rwsem.h:270 [inline] ffff88802cd722c8 (&tty->termios_rwsem){++++}-{4:4}, at: n_tty_flush_buffer+0x21/0x1a0 drivers/tty/n_tty.c:349 but task is already holding lock: ffff888027ed30b8 (&buf->lock){+.+.}-{4:4}, at: tty_buffer_flush+0x72/0x310 drivers/tty/tty_buffer.c:236 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&buf->lock){+.+.}-{4:4}: lock_acquire kernel/locking/lockdep.c:5886 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5843 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a4/0x1bc0 kernel/locking/mutex.c:821 tty_buffer_flush+0x72/0x310 drivers/tty/tty_buffer.c:236 tty_ldisc_flush+0xd2/0xf0 drivers/tty/tty_ldisc.c:388 __do_SAK+0x35f/0x470 drivers/tty/tty_io.c:2998 vc_SAK+0x7f/0x320 drivers/tty/vt/vt_ioctl.c:996 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3387 process_scheduled_works kernel/workqueue.c:3470 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3551 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #2 (console_lock){+.+.}-{0:0}: lock_acquire kernel/locking/lockdep.c:5886 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5843 console_lock+0x7a/0xa0 kernel/printk/printk.c:2896 uart_configure_port drivers/tty/serial/serial_core.c:2530 [inline] serial_core_add_one_port drivers/tty/serial/serial_core.c:3101 [inline] serial_core_register_port+0xe65/0x16f0 drivers/tty/serial/serial_core.c:3322 serial8250_register_8250_port+0x15af/0x2330 drivers/tty/serial/8250/8250_core.c:828 serial_pnp_probe+0x436/0x930 drivers/tty/serial/8250/8250_pnp.c:480 pnp_device_probe+0x2b3/0x4a0 drivers/pnp/driver.c:111 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x210/0x460 drivers/base/dd.c:868 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __driver_attach+0x21f/0x5b0 drivers/base/dd.c:1292 bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383 bus_add_driver+0x305/0x5b0 drivers/base/bus.c:763 driver_register+0x1e2/0x360 drivers/base/driver.c:174 serial8250_init+0xcc/0x1c0 drivers/tty/serial/8250/8250_platform.c:317 do_one_initcall+0x11c/0x6f0 init/main.c:1353 do_initcall_level init/main.c:1415 [inline] do_initcalls init/main.c:1431 [inline] do_basic_setup init/main.c:1451 [inline] kernel_init_freeable+0x6ea/0x7b0 init/main.c:1666 kernel_init+0x21/0x1e0 init/main.c:1556 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #1 (&port->mutex){+.+.}-{4:4}: lock_acquire kernel/locking/lockdep.c:5886 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5843 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a4/0x1bc0 kernel/locking/mutex.c:821 class_mutex_constructor include/linux/mutex.h:253 [inline] uart_set_termios+0x8e/0x690 drivers/tty/serial/serial_core.c:1645 tty_set_termios+0x64d/0x980 drivers/tty/tty_ioctl.c:341 set_termios+0x5c8/0x880 drivers/tty/tty_ioctl.c:516 tty_mode_ioctl+0x17e/0xd40 drivers/tty/tty_ioctl.c:803 n_tty_ioctl_helper+0x47/0x2b0 drivers/tty/tty_ioctl.c:982 n_tty_ioctl+0x53/0x340 drivers/tty/n_tty.c:2496 tty_ioctl+0x11b4/0x1640 drivers/tty/tty_io.c:2774 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&tty->termios_rwsem){++++}-{4:4}: check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3181 check_prevs_add kernel/locking/lockdep.c:3300 [inline] validate_chain kernel/locking/lockdep.c:3924 [inline] __lock_acquire+0x1492/0x1ec0 kernel/locking/lockdep.c:5253 lock_acquire kernel/locking/lockdep.c:5886 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5843 down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1631 class_rwsem_write_constructor include/linux/rwsem.h:270 [inline] n_tty_flush_buffer+0x21/0x1a0 drivers/tty/n_tty.c:349 tty_buffer_flush+0x239/0x310 drivers/tty/tty_buffer.c:248 tty_ldisc_flush+0x68/0xf0 drivers/tty/tty_ldisc.c:388 __do_SAK+0x35f/0x470 drivers/tty/tty_io.c:2998 vc_SAK+0x7f/0x320 drivers/tty/vt/vt_ioctl.c:996 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3387 process_scheduled_works kernel/workqueue.c:3470 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3551 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 other info that might help us debug this: Chain exists of: &tty->termios_rwsem --> console_lock --> &buf->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&buf->lock); lock(console_lock); lock(&buf->lock); lock(&tty->termios_rwsem); *** DEADLOCK *** locks held by kworker/1:4/5984: 5, last CPU#1: #0: ffff88801c0aa940 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3362 #1: ffffc900034c7d08 ((work_completion)(&vc_cons[currcons].SAK_work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3363 #2: ffffffff8edd6100 (console_lock){+.+.}-{0:0}, at: class_console_lock_constructor include/linux/console.h:734 [inline] #2: ffffffff8edd6100 (console_lock){+.+.}-{0:0}, at: vc_SAK+0x13/0x320 drivers/tty/vt/vt_ioctl.c:987 #3: ffff88802cd720a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref drivers/tty/tty_ldisc.c:263 [inline] #3: ffff88802cd720a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_flush+0x1c/0xf0 drivers/tty/tty_ldisc.c:386 #4: ffff888027ed30b8 (&buf->lock){+.+.}-{4:4}, at: tty_buffer_flush+0x72/0x310 drivers/tty/tty_buffer.c:236 stack backtrace: CPU: 1 UID: 0 PID: 5984 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: events vc_SAK Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_circular_bug.cold+0x178/0x1be kernel/locking/lockdep.c:2059 check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2191 check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3181 check_prevs_add kernel/locking/lockdep.c:3300 [inline] validate_chain kernel/locking/lockdep.c:3924 [inline] __lock_acquire+0x1492/0x1ec0 kernel/locking/lockdep.c:5253 lock_acquire kernel/locking/lockdep.c:5886 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5843 down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1631 class_rwsem_write_constructor include/linux/rwsem.h:270 [inline] n_tty_flush_buffer+0x21/0x1a0 drivers/tty/n_tty.c:349 tty_buffer_flush+0x239/0x310 drivers/tty/tty_buffer.c:248 tty_ldisc_flush+0x68/0xf0 drivers/tty/tty_ldisc.c:388 __do_SAK+0x35f/0x470 drivers/tty/tty_io.c:2998 vc_SAK+0x7f/0x320 drivers/tty/vt/vt_ioctl.c:996 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3387 process_scheduled_works kernel/workqueue.c:3470 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3551 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 tty tty20: SAK: killed process 6065 (syz.0.86): by fd#3 tty tty20: SAK: killed process 6080 (syz.0.94): by fd#3 Oops: general protection fault, probably for non-canonical address 0xdffffc000000044c: 0000 [#1] SMP KASAN NOPTI KASAN: probably user-memory-access in range [0x0000000000002260-0x0000000000002267] CPU: 1 UID: 0 PID: 5984 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: events vc_SAK RIP: 0010:reset_buffer_flags+0x22/0x1c0 drivers/tty/n_tty.c:314 Code: 90 90 90 90 90 90 90 90 55 53 48 89 fb e8 76 e9 6a fc 48 8d bb 60 22 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 75 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d RSP: 0018:ffffc900034c7af0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 000000000000044c RSI: ffffffff85a0185a RDI: 0000000000002260 RBP: ffffffff85a049f0 R08: 0000000000000001 R09: ffffed100af3f44d R10: ffff8880579fa26f R11: ffffffff81d66229 R12: ffff8880579fa260 R13: ffff8880579fa4d0 R14: ffff88802cf191e0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880d5ca2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f210fe27dac CR3: 0000000054aa8000 CR4: 0000000000352ef0 Call Trace: n_tty_flush_buffer+0x56/0x1a0 drivers/tty/n_tty.c:350 tty_buffer_flush+0x239/0x310 drivers/tty/tty_buffer.c:248 tty_ldisc_flush+0x68/0xf0 drivers/tty/tty_ldisc.c:388 __do_SAK+0x35f/0x470 drivers/tty/tty_io.c:2998 vc_SAK+0x7f/0x320 drivers/tty/vt/vt_ioctl.c:996 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3387 process_scheduled_works kernel/workqueue.c:3470 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3551 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:reset_buffer_flags+0x22/0x1c0 drivers/tty/n_tty.c:314 Code: 90 90 90 90 90 90 90 90 55 53 48 89 fb e8 76 e9 6a fc 48 8d bb 60 22 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 75 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d RSP: 0018:ffffc900034c7af0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 000000000000044c RSI: ffffffff85a0185a RDI: 0000000000002260 RBP: ffffffff85a049f0 R08: 0000000000000001 R09: ffffed100af3f44d R10: ffff8880579fa26f R11: ffffffff81d66229 R12: ffff8880579fa260 R13: ffff8880579fa4d0 R14: ffff88802cf191e0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880d5ca2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f210fe27dac CR3: 0000000054aa8000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 55 push %rbp 9: 53 push %rbx a: 48 89 fb mov %rdi,%rbx d: e8 76 e9 6a fc call 0xfc6ae988 12: 48 8d bb 60 22 00 00 lea 0x2260(%rbx),%rdi 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 75 01 00 00 jne 0x1a9 34: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 3b: fc ff df 3e: 48 rex.W 3f: 8d .byte 0x8d final repro crashed as (corrupted=false): ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ kworker/1:4/5984 is trying to acquire lock: ffff88802cd722c8 (&tty->termios_rwsem){++++}-{4:4}, at: class_rwsem_write_constructor include/linux/rwsem.h:270 [inline] ffff88802cd722c8 (&tty->termios_rwsem){++++}-{4:4}, at: n_tty_flush_buffer+0x21/0x1a0 drivers/tty/n_tty.c:349 but task is already holding lock: ffff888027ed30b8 (&buf->lock){+.+.}-{4:4}, at: tty_buffer_flush+0x72/0x310 drivers/tty/tty_buffer.c:236 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&buf->lock){+.+.}-{4:4}: lock_acquire kernel/locking/lockdep.c:5886 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5843 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a4/0x1bc0 kernel/locking/mutex.c:821 tty_buffer_flush+0x72/0x310 drivers/tty/tty_buffer.c:236 tty_ldisc_flush+0xd2/0xf0 drivers/tty/tty_ldisc.c:388 __do_SAK+0x35f/0x470 drivers/tty/tty_io.c:2998 vc_SAK+0x7f/0x320 drivers/tty/vt/vt_ioctl.c:996 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3387 process_scheduled_works kernel/workqueue.c:3470 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3551 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #2 (console_lock){+.+.}-{0:0}: lock_acquire kernel/locking/lockdep.c:5886 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5843 console_lock+0x7a/0xa0 kernel/printk/printk.c:2896 uart_configure_port drivers/tty/serial/serial_core.c:2530 [inline] serial_core_add_one_port drivers/tty/serial/serial_core.c:3101 [inline] serial_core_register_port+0xe65/0x16f0 drivers/tty/serial/serial_core.c:3322 serial8250_register_8250_port+0x15af/0x2330 drivers/tty/serial/8250/8250_core.c:828 serial_pnp_probe+0x436/0x930 drivers/tty/serial/8250/8250_pnp.c:480 pnp_device_probe+0x2b3/0x4a0 drivers/pnp/driver.c:111 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x210/0x460 drivers/base/dd.c:868 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __driver_attach+0x21f/0x5b0 drivers/base/dd.c:1292 bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383 bus_add_driver+0x305/0x5b0 drivers/base/bus.c:763 driver_register+0x1e2/0x360 drivers/base/driver.c:174 serial8250_init+0xcc/0x1c0 drivers/tty/serial/8250/8250_platform.c:317 do_one_initcall+0x11c/0x6f0 init/main.c:1353 do_initcall_level init/main.c:1415 [inline] do_initcalls init/main.c:1431 [inline] do_basic_setup init/main.c:1451 [inline] kernel_init_freeable+0x6ea/0x7b0 init/main.c:1666 kernel_init+0x21/0x1e0 init/main.c:1556 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #1 (&port->mutex){+.+.}-{4:4}: lock_acquire kernel/locking/lockdep.c:5886 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5843 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a4/0x1bc0 kernel/locking/mutex.c:821 class_mutex_constructor include/linux/mutex.h:253 [inline] uart_set_termios+0x8e/0x690 drivers/tty/serial/serial_core.c:1645 tty_set_termios+0x64d/0x980 drivers/tty/tty_ioctl.c:341 set_termios+0x5c8/0x880 drivers/tty/tty_ioctl.c:516 tty_mode_ioctl+0x17e/0xd40 drivers/tty/tty_ioctl.c:803 n_tty_ioctl_helper+0x47/0x2b0 drivers/tty/tty_ioctl.c:982 n_tty_ioctl+0x53/0x340 drivers/tty/n_tty.c:2496 tty_ioctl+0x11b4/0x1640 drivers/tty/tty_io.c:2774 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&tty->termios_rwsem){++++}-{4:4}: check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3181 check_prevs_add kernel/locking/lockdep.c:3300 [inline] validate_chain kernel/locking/lockdep.c:3924 [inline] __lock_acquire+0x1492/0x1ec0 kernel/locking/lockdep.c:5253 lock_acquire kernel/locking/lockdep.c:5886 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5843 down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1631 class_rwsem_write_constructor include/linux/rwsem.h:270 [inline] n_tty_flush_buffer+0x21/0x1a0 drivers/tty/n_tty.c:349 tty_buffer_flush+0x239/0x310 drivers/tty/tty_buffer.c:248 tty_ldisc_flush+0x68/0xf0 drivers/tty/tty_ldisc.c:388 __do_SAK+0x35f/0x470 drivers/tty/tty_io.c:2998 vc_SAK+0x7f/0x320 drivers/tty/vt/vt_ioctl.c:996 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3387 process_scheduled_works kernel/workqueue.c:3470 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3551 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 other info that might help us debug this: Chain exists of: &tty->termios_rwsem --> console_lock --> &buf->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&buf->lock); lock(console_lock); lock(&buf->lock); lock(&tty->termios_rwsem); *** DEADLOCK *** locks held by kworker/1:4/5984: 5, last CPU#1: #0: ffff88801c0aa940 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3362 #1: ffffc900034c7d08 ((work_completion)(&vc_cons[currcons].SAK_work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3363 #2: ffffffff8edd6100 (console_lock){+.+.}-{0:0}, at: class_console_lock_constructor include/linux/console.h:734 [inline] #2: ffffffff8edd6100 (console_lock){+.+.}-{0:0}, at: vc_SAK+0x13/0x320 drivers/tty/vt/vt_ioctl.c:987 #3: ffff88802cd720a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref drivers/tty/tty_ldisc.c:263 [inline] #3: ffff88802cd720a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_flush+0x1c/0xf0 drivers/tty/tty_ldisc.c:386 #4: ffff888027ed30b8 (&buf->lock){+.+.}-{4:4}, at: tty_buffer_flush+0x72/0x310 drivers/tty/tty_buffer.c:236 stack backtrace: CPU: 1 UID: 0 PID: 5984 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: events vc_SAK Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_circular_bug.cold+0x178/0x1be kernel/locking/lockdep.c:2059 check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2191 check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3181 check_prevs_add kernel/locking/lockdep.c:3300 [inline] validate_chain kernel/locking/lockdep.c:3924 [inline] __lock_acquire+0x1492/0x1ec0 kernel/locking/lockdep.c:5253 lock_acquire kernel/locking/lockdep.c:5886 [inline] lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5843 down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1631 class_rwsem_write_constructor include/linux/rwsem.h:270 [inline] n_tty_flush_buffer+0x21/0x1a0 drivers/tty/n_tty.c:349 tty_buffer_flush+0x239/0x310 drivers/tty/tty_buffer.c:248 tty_ldisc_flush+0x68/0xf0 drivers/tty/tty_ldisc.c:388 __do_SAK+0x35f/0x470 drivers/tty/tty_io.c:2998 vc_SAK+0x7f/0x320 drivers/tty/vt/vt_ioctl.c:996 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3387 process_scheduled_works kernel/workqueue.c:3470 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3551 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 tty tty20: SAK: killed process 6065 (syz.0.86): by fd#3 tty tty20: SAK: killed process 6080 (syz.0.94): by fd#3 Oops: general protection fault, probably for non-canonical address 0xdffffc000000044c: 0000 [#1] SMP KASAN NOPTI KASAN: probably user-memory-access in range [0x0000000000002260-0x0000000000002267] CPU: 1 UID: 0 PID: 5984 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: events vc_SAK RIP: 0010:reset_buffer_flags+0x22/0x1c0 drivers/tty/n_tty.c:314 Code: 90 90 90 90 90 90 90 90 55 53 48 89 fb e8 76 e9 6a fc 48 8d bb 60 22 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 75 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d RSP: 0018:ffffc900034c7af0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 000000000000044c RSI: ffffffff85a0185a RDI: 0000000000002260 RBP: ffffffff85a049f0 R08: 0000000000000001 R09: ffffed100af3f44d R10: ffff8880579fa26f R11: ffffffff81d66229 R12: ffff8880579fa260 R13: ffff8880579fa4d0 R14: ffff88802cf191e0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880d5ca2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f210fe27dac CR3: 0000000054aa8000 CR4: 0000000000352ef0 Call Trace: n_tty_flush_buffer+0x56/0x1a0 drivers/tty/n_tty.c:350 tty_buffer_flush+0x239/0x310 drivers/tty/tty_buffer.c:248 tty_ldisc_flush+0x68/0xf0 drivers/tty/tty_ldisc.c:388 __do_SAK+0x35f/0x470 drivers/tty/tty_io.c:2998 vc_SAK+0x7f/0x320 drivers/tty/vt/vt_ioctl.c:996 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3387 process_scheduled_works kernel/workqueue.c:3470 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3551 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:reset_buffer_flags+0x22/0x1c0 drivers/tty/n_tty.c:314 Code: 90 90 90 90 90 90 90 90 55 53 48 89 fb e8 76 e9 6a fc 48 8d bb 60 22 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 75 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d RSP: 0018:ffffc900034c7af0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 000000000000044c RSI: ffffffff85a0185a RDI: 0000000000002260 RBP: ffffffff85a049f0 R08: 0000000000000001 R09: ffffed100af3f44d R10: ffff8880579fa26f R11: ffffffff81d66229 R12: ffff8880579fa260 R13: ffff8880579fa4d0 R14: ffff88802cf191e0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880d5ca2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f210fe27dac CR3: 0000000054aa8000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 55 push %rbp 9: 53 push %rbx a: 48 89 fb mov %rdi,%rbx d: e8 76 e9 6a fc call 0xfc6ae988 12: 48 8d bb 60 22 00 00 lea 0x2260(%rbx),%rdi 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 75 01 00 00 jne 0x1a9 34: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 3b: fc ff df 3e: 48 rex.W 3f: 8d .byte 0x8d