Extracting prog: 1m10.441725146s Minimizing prog: 6m57.522335484s Simplifying prog options: 0s Extracting C: 22.520429692s Simplifying C: 4m11.58510377s 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:5 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID detailed listing: executing program 0: r0 = socket$pppl2tp(0x18, 0x1, 0x1) r1 = socket$inet6_udp(0xa, 0x2, 0x0) connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32) sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5) syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58) ioctl$EXT4_IOC_GETFSUUID(r2, 0x40047452, 0x0) program crashed: KASAN: use-after-free Write in pppol2tp_release single: successfully extracted reproducer found reproducer with 6 syscalls minimizing guilty program testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3 detailed listing: executing program 0: r0 = socket$pppl2tp(0x18, 0x1, 0x1) r1 = socket$inet6_udp(0xa, 0x2, 0x0) connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32) sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5) syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040), 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-ioctl$EXT4_IOC_GETFSUUID detailed listing: executing program 0: r0 = socket$pppl2tp(0x18, 0x1, 0x1) r1 = socket$inet6_udp(0xa, 0x2, 0x0) connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32) sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5) ioctl$EXT4_IOC_GETFSUUID(0xffffffffffffffff, 0x40047452, 0x0) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-syz_clone3-ioctl$EXT4_IOC_GETFSUUID detailed listing: executing program 0: r0 = socket$pppl2tp(0x18, 0x1, 0x1) r1 = socket$inet6_udp(0xa, 0x2, 0x0) connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32) syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58) ioctl$EXT4_IOC_GETFSUUID(r2, 0x40047452, 0x0) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID detailed listing: executing program 0: socket$pppl2tp(0x18, 0x1, 0x1) socket$inet6_udp(0xa, 0x2, 0x0) sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5) syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58) ioctl$EXT4_IOC_GETFSUUID(r0, 0x40047452, 0x0) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID detailed listing: executing program 0: r0 = socket$pppl2tp(0x18, 0x1, 0x1) connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, 0xffffffffffffffff, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32) sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5) syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58) ioctl$EXT4_IOC_GETFSUUID(r1, 0x40047452, 0x0) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID detailed listing: executing program 0: r0 = socket$inet6_udp(0xa, 0x2, 0x0) connect$pppl2tp(0xffffffffffffffff, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32) sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5) syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58) ioctl$EXT4_IOC_GETFSUUID(r1, 0x40047452, 0x0) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID detailed listing: executing program 0: r0 = socket$pppl2tp(0x18, 0x1, 0x1) socket$inet6_udp(0xa, 0x2, 0x0) connect$pppl2tp(r0, 0x0, 0x0) sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5) syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58) ioctl$EXT4_IOC_GETFSUUID(r1, 0x40047452, 0x0) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID detailed listing: executing program 0: r0 = socket$pppl2tp(0x18, 0x1, 0x1) r1 = socket$inet6_udp(0xa, 0x2, 0x0) connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32) sendfile(0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0xac5) syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58) ioctl$EXT4_IOC_GETFSUUID(r2, 0x40047452, 0x0) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID detailed listing: executing program 0: r0 = socket$pppl2tp(0x18, 0x1, 0x1) r1 = socket$inet6_udp(0xa, 0x2, 0x0) connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32) sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5) syz_clone3(0x0, 0x0) ioctl$EXT4_IOC_GETFSUUID(0xffffffffffffffff, 0x40047452, 0x0) program did not crash testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID detailed listing: executing program 0: r0 = socket$pppl2tp(0x18, 0x1, 0x1) r1 = socket$inet6_udp(0xa, 0x2, 0x0) connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32) sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5) syz_clone3(&(0x7f0000000900)={0x23800000, 0x0, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58) ioctl$EXT4_IOC_GETFSUUID(0xffffffffffffffff, 0x40047452, 0x0) program did not crash extracting C reproducer testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID program crashed: KASAN: use-after-free Write in pppol2tp_release simplifying C reproducer testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session a never seen crash title: KASAN: use-after-free Read in pppol2tp_sock_to_session, ignore testing compiled C program (duration=30s, {Threaded:true 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session a never seen crash title: KASAN: use-after-free Read in pppol2tp_sock_to_session, ignore testing compiled C program (duration=30s, {Threaded:true 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session a never seen crash title: KASAN: use-after-free Read in pppol2tp_sock_to_session, ignore testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID program crashed: KASAN: use-after-free Write in pppol2tp_release testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session a never seen crash title: KASAN: use-after-free Read in pppol2tp_sock_to_session, ignore testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session a never seen crash title: KASAN: use-after-free Read in pppol2tp_sock_to_session, ignore testing compiled C program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session a never seen crash title: KASAN: use-after-free Read in pppol2tp_sock_to_session, ignore testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID detailed listing: executing program 0: r0 = socket$pppl2tp(0x18, 0x1, 0x1) r1 = socket$inet6_udp(0xa, 0x2, 0x0) connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32) sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5) syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58) ioctl$EXT4_IOC_GETFSUUID(r2, 0x40047452, 0x0) program crashed: KASAN: use-after-free Write in pppol2tp_release validation run: crashed=true testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID detailed listing: executing program 0: r0 = socket$pppl2tp(0x18, 0x1, 0x1) r1 = socket$inet6_udp(0xa, 0x2, 0x0) connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32) sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5) syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58) ioctl$EXT4_IOC_GETFSUUID(r2, 0x40047452, 0x0) program crashed: KASAN: use-after-free Write in pppol2tp_release validation run: crashed=true testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID detailed listing: executing program 0: r0 = socket$pppl2tp(0x18, 0x1, 0x1) r1 = socket$inet6_udp(0xa, 0x2, 0x0) connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32) sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5) syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58) ioctl$EXT4_IOC_GETFSUUID(r2, 0x40047452, 0x0) program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session validation run: crashed=true reproducing took 14m30.397437176s repro crashed as (corrupted=false): ================================================================== BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 net/l2tp/l2tp_ppp.c:156 Read of size 4 at addr ffff888127addc00 by task syz.5.17/396 CPU: 0 PID: 396 Comm: syz.5.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x10f/0x150 mm/kasan/report.c:444 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 pppol2tp_sock_to_session+0x1a0/0x1b0 net/l2tp/l2tp_ppp.c:156 pppol2tp_release+0x150/0x2b0 net/l2tp/l2tp_ppp.c:435 __sock_release net/socket.c:649 [inline] sock_close+0xb8/0x200 net/socket.c:1336 __fput+0x22b/0x900 fs/file_table.c:311 ____fput+0x15/0x20 fs/file_table.c:339 task_work_run+0x127/0x190 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xb70/0x29a0 kernel/exit.c:896 __do_sys_exit kernel/exit.c:979 [inline] __se_sys_exit kernel/exit.c:977 [inline] __x64_sys_exit+0x40/0x40 kernel/exit.c:977 x64_sys_call+0x44/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:61 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fbb33b74b19 Code: Unable to access opcode bytes at RIP 0x7fbb33b74aef. RSP: 002b:00007fbb339d3ef8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c RAX: ffffffffffffffda RBX: 0000000000000058 RCX: 00007fbb33b74b19 RDX: 00007fbb339d49c8 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fbb33c0cb70 R08: 0000000000000000 R09: 0000000000000058 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbb33dfb038 R14: 00007fbb33dfafa0 R15: 00007ffd9bc57918 Allocated by task 395: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc+0x13d/0x2c0 mm/slub.c:4436 kmalloc include/linux/slab.h:624 [inline] kzalloc include/linux/slab.h:750 [inline] l2tp_session_create+0x39/0xb60 net/l2tp/l2tp_core.c:1616 pppol2tp_connect+0xbf5/0x1640 net/l2tp/l2tp_ppp.c:772 __sys_connect_file net/socket.c:1923 [inline] __sys_connect+0x3cb/0x450 net/socket.c:1940 __do_sys_connect net/socket.c:1950 [inline] __se_sys_connect net/socket.c:1947 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:1947 x64_sys_call+0x7c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:43 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 393: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kfree+0xc4/0x270 mm/slub.c:4588 l2tp_session_free net/l2tp/l2tp_core.c:168 [inline] l2tp_session_put+0xaf/0x1a0 net/l2tp/l2tp_core.c:193 l2tp_session_delete+0x3a9/0x4a0 net/l2tp/l2tp_core.c:1589 l2tp_tunnel_closeall net/l2tp/l2tp_core.c:1235 [inline] l2tp_tunnel_del_work+0x180/0x3d0 net/l2tp/l2tp_core.c:1273 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328 worker_thread+0xaa0/0x1250 kernel/workqueue.c:2475 kthread+0x3f5/0x4f0 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff888127addc00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of 512-byte region [ffff888127addc00, ffff888127adde00) The buggy address belongs to the page: page:ffffea00049eb700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x127adc head:ffffea00049eb700 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100042f00 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 379, ts 28248749093, free_ts 26680263708 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2610 prep_new_page+0x1c/0x110 mm/page_alloc.c:2616 get_page_from_freelist+0x2d42/0x2dd0 mm/page_alloc.c:4492 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5829 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa0/0x4d0 mm/slub.c:2000 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0x210/0x730 net/core/skbuff.c:428 alloc_skb include/linux/skbuff.h:1183 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1182 [inline] netlink_sendmsg+0x611/0xb80 net/netlink/af_netlink.c:1898 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] __sys_sendto+0x46d/0x620 net/socket.c:2063 __do_sys_sendto net/socket.c:2075 [inline] __se_sys_sendto net/socket.c:2071 [inline] __x64_sys_sendto+0xe5/0x100 net/socket.c:2071 x64_sys_call+0x178/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:45 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1477 [inline] free_pcp_prepare mm/page_alloc.c:1549 [inline] free_unref_page_prepare+0x5fa/0x600 mm/page_alloc.c:3540 free_unref_page+0xae/0x540 mm/page_alloc.c:3622 free_the_page mm/page_alloc.c:808 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5905 free_pages+0x82/0x90 mm/page_alloc.c:5916 kasan_depopulate_vmalloc_pte+0x6b/0x90 mm/kasan/shadow.c:354 apply_to_pte_range mm/memory.c:2645 [inline] apply_to_pmd_range mm/memory.c:2689 [inline] apply_to_pud_range mm/memory.c:2725 [inline] apply_to_p4d_range mm/memory.c:2761 [inline] __apply_to_page_range+0x8ca/0xc70 mm/memory.c:2797 apply_to_existing_page_range+0x38/0x50 mm/memory.c:2830 kasan_release_vmalloc+0x97/0xb0 mm/kasan/shadow.c:464 __purge_vmap_area_lazy+0xa8d/0x1890 mm/vmalloc.c:1723 try_purge_vmap_area_lazy+0x38/0x50 mm/vmalloc.c:1742 free_vmap_area_noflush+0xa59/0xaa0 mm/vmalloc.c:1784 free_unmap_vmap_area mm/vmalloc.c:1797 [inline] remove_vm_area+0x1c1/0x1e0 mm/vmalloc.c:2552 vm_remove_mappings mm/vmalloc.c:2581 [inline] __vunmap+0x259/0x980 mm/vmalloc.c:2650 __vfree mm/vmalloc.c:2709 [inline] vfree+0x8b/0xc0 mm/vmalloc.c:2740 kcov_put kernel/kcov.c:422 [inline] kcov_close+0x2b/0x50 kernel/kcov.c:524 __fput+0x22b/0x900 fs/file_table.c:311 Memory state around the buggy address: ffff888127addb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888127addb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888127addc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888127addc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888127addd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ------------[ cut here ]------------ WARNING: CPU: 1 PID: 396 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 net/l2tp/l2tp_ppp.c:156 Modules linked in: CPU: 0 PID: 396 Comm: syz.5.17 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 net/l2tp/l2tp_ppp.c:156 Code: 5d c3 e8 ec 16 0a fd be 02 00 00 00 eb 0a e8 e0 16 0a fd be 01 00 00 00 4c 89 f7 e8 b3 bc f0 fd e9 0f ff ff ff e8 c9 16 0a fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 b8 16 0a fd 4c 89 f7 be 03 RSP: 0018:ffffc90001497bf0 EFLAGS: 00010293 RAX: ffffffff845fc037 RBX: ffff888111a4f000 RCX: ffff88810c1fe400 RDX: 0000000000000000 RSI: 00000000299ac8c0 RDI: 000000000c04eb7d RBP: ffffc90001497c10 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff0e1904c R12: dffffc0000000000 R13: dffffc0000000000 R14: 00000000299ac8c0 R15: ffff888127addc00 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbb33b35320 CR3: 00000001209f9000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pppol2tp_release+0x150/0x2b0 net/l2tp/l2tp_ppp.c:435 __sock_release net/socket.c:649 [inline] sock_close+0xb8/0x200 net/socket.c:1336 __fput+0x22b/0x900 fs/file_table.c:311 ____fput+0x15/0x20 fs/file_table.c:339 task_work_run+0x127/0x190 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xb70/0x29a0 kernel/exit.c:896 __do_sys_exit kernel/exit.c:979 [inline] __se_sys_exit kernel/exit.c:977 [inline] __x64_sys_exit+0x40/0x40 kernel/exit.c:977 x64_sys_call+0x44/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:61 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fbb33b74b19 Code: Unable to access opcode bytes at RIP 0x7fbb33b74aef. RSP: 002b:00007fbb339d3ef8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c RAX: ffffffffffffffda RBX: 0000000000000058 RCX: 00007fbb33b74b19 RDX: 00007fbb339d49c8 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fbb33c0cb70 R08: 0000000000000000 R09: 0000000000000058 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbb33dfb038 R14: 00007fbb33dfafa0 R15: 00007ffd9bc57918 ---[ end trace 325abccce7c74347 ]--- final repro crashed as (corrupted=false): ================================================================== BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 net/l2tp/l2tp_ppp.c:156 Read of size 4 at addr ffff888127addc00 by task syz.5.17/396 CPU: 0 PID: 396 Comm: syz.5.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x10f/0x150 mm/kasan/report.c:444 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 pppol2tp_sock_to_session+0x1a0/0x1b0 net/l2tp/l2tp_ppp.c:156 pppol2tp_release+0x150/0x2b0 net/l2tp/l2tp_ppp.c:435 __sock_release net/socket.c:649 [inline] sock_close+0xb8/0x200 net/socket.c:1336 __fput+0x22b/0x900 fs/file_table.c:311 ____fput+0x15/0x20 fs/file_table.c:339 task_work_run+0x127/0x190 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xb70/0x29a0 kernel/exit.c:896 __do_sys_exit kernel/exit.c:979 [inline] __se_sys_exit kernel/exit.c:977 [inline] __x64_sys_exit+0x40/0x40 kernel/exit.c:977 x64_sys_call+0x44/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:61 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fbb33b74b19 Code: Unable to access opcode bytes at RIP 0x7fbb33b74aef. RSP: 002b:00007fbb339d3ef8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c RAX: ffffffffffffffda RBX: 0000000000000058 RCX: 00007fbb33b74b19 RDX: 00007fbb339d49c8 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fbb33c0cb70 R08: 0000000000000000 R09: 0000000000000058 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbb33dfb038 R14: 00007fbb33dfafa0 R15: 00007ffd9bc57918 Allocated by task 395: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc+0x13d/0x2c0 mm/slub.c:4436 kmalloc include/linux/slab.h:624 [inline] kzalloc include/linux/slab.h:750 [inline] l2tp_session_create+0x39/0xb60 net/l2tp/l2tp_core.c:1616 pppol2tp_connect+0xbf5/0x1640 net/l2tp/l2tp_ppp.c:772 __sys_connect_file net/socket.c:1923 [inline] __sys_connect+0x3cb/0x450 net/socket.c:1940 __do_sys_connect net/socket.c:1950 [inline] __se_sys_connect net/socket.c:1947 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:1947 x64_sys_call+0x7c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:43 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 393: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kfree+0xc4/0x270 mm/slub.c:4588 l2tp_session_free net/l2tp/l2tp_core.c:168 [inline] l2tp_session_put+0xaf/0x1a0 net/l2tp/l2tp_core.c:193 l2tp_session_delete+0x3a9/0x4a0 net/l2tp/l2tp_core.c:1589 l2tp_tunnel_closeall net/l2tp/l2tp_core.c:1235 [inline] l2tp_tunnel_del_work+0x180/0x3d0 net/l2tp/l2tp_core.c:1273 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328 worker_thread+0xaa0/0x1250 kernel/workqueue.c:2475 kthread+0x3f5/0x4f0 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff888127addc00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of 512-byte region [ffff888127addc00, ffff888127adde00) The buggy address belongs to the page: page:ffffea00049eb700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x127adc head:ffffea00049eb700 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100042f00 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 379, ts 28248749093, free_ts 26680263708 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2610 prep_new_page+0x1c/0x110 mm/page_alloc.c:2616 get_page_from_freelist+0x2d42/0x2dd0 mm/page_alloc.c:4492 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5829 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa0/0x4d0 mm/slub.c:2000 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0x210/0x730 net/core/skbuff.c:428 alloc_skb include/linux/skbuff.h:1183 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1182 [inline] netlink_sendmsg+0x611/0xb80 net/netlink/af_netlink.c:1898 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] __sys_sendto+0x46d/0x620 net/socket.c:2063 __do_sys_sendto net/socket.c:2075 [inline] __se_sys_sendto net/socket.c:2071 [inline] __x64_sys_sendto+0xe5/0x100 net/socket.c:2071 x64_sys_call+0x178/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:45 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1477 [inline] free_pcp_prepare mm/page_alloc.c:1549 [inline] free_unref_page_prepare+0x5fa/0x600 mm/page_alloc.c:3540 free_unref_page+0xae/0x540 mm/page_alloc.c:3622 free_the_page mm/page_alloc.c:808 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5905 free_pages+0x82/0x90 mm/page_alloc.c:5916 kasan_depopulate_vmalloc_pte+0x6b/0x90 mm/kasan/shadow.c:354 apply_to_pte_range mm/memory.c:2645 [inline] apply_to_pmd_range mm/memory.c:2689 [inline] apply_to_pud_range mm/memory.c:2725 [inline] apply_to_p4d_range mm/memory.c:2761 [inline] __apply_to_page_range+0x8ca/0xc70 mm/memory.c:2797 apply_to_existing_page_range+0x38/0x50 mm/memory.c:2830 kasan_release_vmalloc+0x97/0xb0 mm/kasan/shadow.c:464 __purge_vmap_area_lazy+0xa8d/0x1890 mm/vmalloc.c:1723 try_purge_vmap_area_lazy+0x38/0x50 mm/vmalloc.c:1742 free_vmap_area_noflush+0xa59/0xaa0 mm/vmalloc.c:1784 free_unmap_vmap_area mm/vmalloc.c:1797 [inline] remove_vm_area+0x1c1/0x1e0 mm/vmalloc.c:2552 vm_remove_mappings mm/vmalloc.c:2581 [inline] __vunmap+0x259/0x980 mm/vmalloc.c:2650 __vfree mm/vmalloc.c:2709 [inline] vfree+0x8b/0xc0 mm/vmalloc.c:2740 kcov_put kernel/kcov.c:422 [inline] kcov_close+0x2b/0x50 kernel/kcov.c:524 __fput+0x22b/0x900 fs/file_table.c:311 Memory state around the buggy address: ffff888127addb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888127addb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888127addc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888127addc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888127addd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ------------[ cut here ]------------ WARNING: CPU: 1 PID: 396 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 net/l2tp/l2tp_ppp.c:156 Modules linked in: CPU: 0 PID: 396 Comm: syz.5.17 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 net/l2tp/l2tp_ppp.c:156 Code: 5d c3 e8 ec 16 0a fd be 02 00 00 00 eb 0a e8 e0 16 0a fd be 01 00 00 00 4c 89 f7 e8 b3 bc f0 fd e9 0f ff ff ff e8 c9 16 0a fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 b8 16 0a fd 4c 89 f7 be 03 RSP: 0018:ffffc90001497bf0 EFLAGS: 00010293 RAX: ffffffff845fc037 RBX: ffff888111a4f000 RCX: ffff88810c1fe400 RDX: 0000000000000000 RSI: 00000000299ac8c0 RDI: 000000000c04eb7d RBP: ffffc90001497c10 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff0e1904c R12: dffffc0000000000 R13: dffffc0000000000 R14: 00000000299ac8c0 R15: ffff888127addc00 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbb33b35320 CR3: 00000001209f9000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pppol2tp_release+0x150/0x2b0 net/l2tp/l2tp_ppp.c:435 __sock_release net/socket.c:649 [inline] sock_close+0xb8/0x200 net/socket.c:1336 __fput+0x22b/0x900 fs/file_table.c:311 ____fput+0x15/0x20 fs/file_table.c:339 task_work_run+0x127/0x190 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xb70/0x29a0 kernel/exit.c:896 __do_sys_exit kernel/exit.c:979 [inline] __se_sys_exit kernel/exit.c:977 [inline] __x64_sys_exit+0x40/0x40 kernel/exit.c:977 x64_sys_call+0x44/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:61 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fbb33b74b19 Code: Unable to access opcode bytes at RIP 0x7fbb33b74aef. RSP: 002b:00007fbb339d3ef8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c RAX: ffffffffffffffda RBX: 0000000000000058 RCX: 00007fbb33b74b19 RDX: 00007fbb339d49c8 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fbb33c0cb70 R08: 0000000000000000 R09: 0000000000000058 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbb33dfb038 R14: 00007fbb33dfafa0 R15: 00007ffd9bc57918 ---[ end trace 325abccce7c74347 ]---