Extracting prog: 4m35.603503216s
Minimizing prog: 47m47.353027116s
Simplifying prog options: 14m26.83320652s
Extracting C: 6m16.534389868s
Simplifying C: 0s


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}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_smc-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
r1 = socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000080)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r1, 0x5)
r2 = socket$inet_smc(0x2b, 0x1, 0x0)
connect$inet(r2, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program did not crash
single: failed to extract reproducer
single: executing 1 programs separately with timeout 6m0s
testing program (duration=6m0s, {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}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_smc-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
r1 = socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000080)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r1, 0x5)
r2 = socket$inet_smc(0x2b, 0x1, 0x0)
connect$inet(r2, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program crashed: possible deadlock in smc_release
single: successfully extracted reproducer
found reproducer with 7 syscalls
minimizing guilty program
testing program (duration=6m0s, {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}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_smc
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
r1 = socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000080)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r1, 0x5)
socket$inet_smc(0x2b, 0x1, 0x0)

program did not crash
testing program (duration=6m0s, {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}}): socket$inet6_tcp-close-socket-bind$inet6-listen-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
r1 = socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000080)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r1, 0x5)
connect$inet(0xffffffffffffffff, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program crashed: lost connection to test machine
suppressed program crash: lost connection to test machine
testing program (duration=6m0s, {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}}): socket$inet6_tcp-close-socket-bind$inet6-socket$inet_smc-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000080)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
r1 = socket$inet_smc(0x2b, 0x1, 0x0)
connect$inet(r1, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program did not crash
testing program (duration=6m0s, {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}}): socket$inet6_tcp-close-socket-listen-socket$inet_smc-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
r1 = socket(0x2b, 0x1, 0x1)
listen(r1, 0x5)
r2 = socket$inet_smc(0x2b, 0x1, 0x0)
connect$inet(r2, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program did not crash
testing program (duration=6m0s, {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}}): socket$inet6_tcp-close-bind$inet6-listen-socket$inet_smc-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
bind$inet6(r0, &(0x7f0000000080)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(0xffffffffffffffff, 0x5)
r1 = socket$inet_smc(0x2b, 0x1, 0x0)
connect$inet(r1, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program crashed: lost connection to test machine
suppressed program crash: lost connection to test machine
testing program (duration=6m0s, {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}}): socket$inet6_tcp-socket-bind$inet6-listen-socket$inet_smc-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
r1 = socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000080)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r1, 0x5)
r2 = socket$inet_smc(0x2b, 0x1, 0x0)
connect$inet(r2, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program crashed: lost connection to test machine
suppressed program crash: lost connection to test machine
testing program (duration=6m0s, {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}}): close-socket-bind$inet6-listen-socket$inet_smc-connect$inet
detailed listing:
executing program 0:
close(0xffffffffffffffff)
r0 = socket(0x2b, 0x1, 0x1)
bind$inet6(0xffffffffffffffff, &(0x7f0000000080)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r0, 0x5)
r1 = socket$inet_smc(0x2b, 0x1, 0x0)
connect$inet(r1, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program did not crash
testing program (duration=6m0s, {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}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_smc-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
r1 = socket(0x2b, 0x1, 0x1)
bind$inet6(r0, 0x0, 0x0)
listen(r1, 0x5)
r2 = socket$inet_smc(0x2b, 0x1, 0x0)
connect$inet(r2, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program did not crash
testing program (duration=6m0s, {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}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_smc-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
r1 = socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000080)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r1, 0x5)
r2 = socket$inet_smc(0x2b, 0x1, 0x0)
connect$inet(r2, 0x0, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=6m0s, {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}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_smc-connect$inet
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
simplifying guilty program options
testing program (duration=6m0s, {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}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_smc-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
r1 = socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000080)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r1, 0x5)
r2 = socket$inet_smc(0x2b, 0x1, 0x0)
connect$inet(r2, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program crashed: possible deadlock in smc_release
extracting C reproducer
testing compiled C program (duration=6m0s, {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}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_smc-connect$inet
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
testing program (duration=6m0s, {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}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_smc-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
r1 = socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000080)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r1, 0x5)
r2 = socket$inet_smc(0x2b, 0x1, 0x0)
connect$inet(r2, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program crashed: possible deadlock in smc_release
extracting C reproducer
testing compiled C program (duration=6m0s, {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}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_smc-connect$inet
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
testing program (duration=6m0s, {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}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_smc-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
r1 = socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000080)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r1, 0x5)
r2 = socket$inet_smc(0x2b, 0x1, 0x0)
connect$inet(r2, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program crashed: possible deadlock in smc_release
validation run: crashed=true
testing program (duration=6m0s, {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}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_smc-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
r1 = socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000080)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r1, 0x5)
r2 = socket$inet_smc(0x2b, 0x1, 0x0)
connect$inet(r2, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program crashed: possible deadlock in smc_release
validation run: crashed=true
testing program (duration=6m0s, {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}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_smc-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
r1 = socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000080)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r1, 0x5)
r2 = socket$inet_smc(0x2b, 0x1, 0x0)
connect$inet(r2, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program crashed: possible deadlock in smc_release
validation run: crashed=true
reproducing took 1h15m25.19236176s
repro crashed as (corrupted=false):
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.346/6324 is trying to acquire lock:
ffff8880730b7ae8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
ffff8880730b7ae8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
ffff8880730b7ae8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: start_flush_work kernel/workqueue.c:4255 [inline]
ffff8880730b7ae8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: __flush_work+0x100/0xc50 kernel/workqueue.c:4313

but task is already holding lock:
ffff888073018260 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x255/0x560 net/smc/af_smc.c:-1

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (sk_lock-AF_SMC/1){+.+.}-{0:0}:
       lock_sock_nested+0x41/0x100 net/core/sock.c:3780
       smc_listen_out+0x109/0x3e0 net/smc/af_smc.c:1926
       smc_listen_work+0x813/0x13f0 net/smc/af_smc.c:-1
       process_one_work+0x9ab/0x1780 kernel/workqueue.c:3289
       process_scheduled_works kernel/workqueue.c:3380 [inline]
       worker_thread+0xb49/0x1140 kernel/workqueue.c:3461
       kthread+0x388/0x470 kernel/kthread.c:436
       ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237
       lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
       touch_work_lockdep_map kernel/workqueue.c:4027 [inline]
       start_flush_work kernel/workqueue.c:4281 [inline]
       __flush_work+0x700/0xc50 kernel/workqueue.c:4313
       __cancel_work_sync+0xbe/0x110 kernel/workqueue.c:4469
       smc_clcsock_release+0x60/0xf0 net/smc/smc_close.c:29
       __smc_release+0x66b/0x7e0 net/smc/af_smc.c:306
       smc_close_non_accepted+0xd5/0x1f0 net/smc/af_smc.c:1857
       smc_close_cleanup_listen net/smc/smc_close.c:45 [inline]
       smc_close_active+0xb67/0xf10 net/smc/smc_close.c:225
       __smc_release+0x8d/0x7e0 net/smc/af_smc.c:282
       smc_release+0x2ce/0x560 net/smc/af_smc.c:349
       __sock_release+0xb9/0x250 net/socket.c:731
       sock_close+0x1c/0x30 net/socket.c:1534
       __fput+0x44f/0xa70 fs/file_table.c:469
       task_work_run+0x1d9/0x270 kernel/task_work.c:233
       resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
       __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
       exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
       __exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
       syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [inline]
       syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
       do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(sk_lock-AF_SMC/1);
                               lock((work_completion)(&new_smc->smc_listen_work));
                               lock(sk_lock-AF_SMC/1);
  lock((work_completion)(&new_smc->smc_listen_work));

 *** DEADLOCK ***

3 locks held by syz.0.346/6324:
 #0: ffff88805c48b848 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
 #0: ffff88805c48b848 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: __sock_release+0x89/0x250 net/socket.c:730
 #1: ffff888073018260 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x255/0x560 net/smc/af_smc.c:-1
 #2: ffffffff8eb5f3a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #2: ffffffff8eb5f3a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #2: ffffffff8eb5f3a0 (rcu_read_lock){....}-{1:3}, at: start_flush_work kernel/workqueue.c:4255 [inline]
 #2: ffffffff8eb5f3a0 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x100/0xc50 kernel/workqueue.c:4313

stack backtrace:
CPU: 1 UID: 0 PID: 6324 Comm: syz.0.346 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043
 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237
 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
 touch_work_lockdep_map kernel/workqueue.c:4027 [inline]
 start_flush_work kernel/workqueue.c:4281 [inline]
 __flush_work+0x700/0xc50 kernel/workqueue.c:4313
 __cancel_work_sync+0xbe/0x110 kernel/workqueue.c:4469
 smc_clcsock_release+0x60/0xf0 net/smc/smc_close.c:29
 __smc_release+0x66b/0x7e0 net/smc/af_smc.c:306
 smc_close_non_accepted+0xd5/0x1f0 net/smc/af_smc.c:1857
 smc_close_cleanup_listen net/smc/smc_close.c:45 [inline]
 smc_close_active+0xb67/0xf10 net/smc/smc_close.c:225
 __smc_release+0x8d/0x7e0 net/smc/af_smc.c:282
 smc_release+0x2ce/0x560 net/smc/af_smc.c:349
 __sock_release+0xb9/0x250 net/socket.c:731
 sock_close+0x1c/0x30 net/socket.c:1534
 __fput+0x44f/0xa70 fs/file_table.c:469
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
 do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f815ed9c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc5e15ea38 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffc5e15eb20 RCX: 00007f815ed9c799
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000001b89f R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2f420000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f815f015fac R14: 00007f815f015fa8 R15: 00007f815f015fa0
 </TASK>

final repro crashed as (corrupted=false):
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.346/6324 is trying to acquire lock:
ffff8880730b7ae8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
ffff8880730b7ae8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
ffff8880730b7ae8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: start_flush_work kernel/workqueue.c:4255 [inline]
ffff8880730b7ae8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: __flush_work+0x100/0xc50 kernel/workqueue.c:4313

but task is already holding lock:
ffff888073018260 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x255/0x560 net/smc/af_smc.c:-1

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (sk_lock-AF_SMC/1){+.+.}-{0:0}:
       lock_sock_nested+0x41/0x100 net/core/sock.c:3780
       smc_listen_out+0x109/0x3e0 net/smc/af_smc.c:1926
       smc_listen_work+0x813/0x13f0 net/smc/af_smc.c:-1
       process_one_work+0x9ab/0x1780 kernel/workqueue.c:3289
       process_scheduled_works kernel/workqueue.c:3380 [inline]
       worker_thread+0xb49/0x1140 kernel/workqueue.c:3461
       kthread+0x388/0x470 kernel/kthread.c:436
       ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237
       lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
       touch_work_lockdep_map kernel/workqueue.c:4027 [inline]
       start_flush_work kernel/workqueue.c:4281 [inline]
       __flush_work+0x700/0xc50 kernel/workqueue.c:4313
       __cancel_work_sync+0xbe/0x110 kernel/workqueue.c:4469
       smc_clcsock_release+0x60/0xf0 net/smc/smc_close.c:29
       __smc_release+0x66b/0x7e0 net/smc/af_smc.c:306
       smc_close_non_accepted+0xd5/0x1f0 net/smc/af_smc.c:1857
       smc_close_cleanup_listen net/smc/smc_close.c:45 [inline]
       smc_close_active+0xb67/0xf10 net/smc/smc_close.c:225
       __smc_release+0x8d/0x7e0 net/smc/af_smc.c:282
       smc_release+0x2ce/0x560 net/smc/af_smc.c:349
       __sock_release+0xb9/0x250 net/socket.c:731
       sock_close+0x1c/0x30 net/socket.c:1534
       __fput+0x44f/0xa70 fs/file_table.c:469
       task_work_run+0x1d9/0x270 kernel/task_work.c:233
       resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
       __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
       exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
       __exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
       syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [inline]
       syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
       do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(sk_lock-AF_SMC/1);
                               lock((work_completion)(&new_smc->smc_listen_work));
                               lock(sk_lock-AF_SMC/1);
  lock((work_completion)(&new_smc->smc_listen_work));

 *** DEADLOCK ***

3 locks held by syz.0.346/6324:
 #0: ffff88805c48b848 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
 #0: ffff88805c48b848 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: __sock_release+0x89/0x250 net/socket.c:730
 #1: ffff888073018260 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x255/0x560 net/smc/af_smc.c:-1
 #2: ffffffff8eb5f3a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #2: ffffffff8eb5f3a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #2: ffffffff8eb5f3a0 (rcu_read_lock){....}-{1:3}, at: start_flush_work kernel/workqueue.c:4255 [inline]
 #2: ffffffff8eb5f3a0 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x100/0xc50 kernel/workqueue.c:4313

stack backtrace:
CPU: 1 UID: 0 PID: 6324 Comm: syz.0.346 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043
 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237
 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
 touch_work_lockdep_map kernel/workqueue.c:4027 [inline]
 start_flush_work kernel/workqueue.c:4281 [inline]
 __flush_work+0x700/0xc50 kernel/workqueue.c:4313
 __cancel_work_sync+0xbe/0x110 kernel/workqueue.c:4469
 smc_clcsock_release+0x60/0xf0 net/smc/smc_close.c:29
 __smc_release+0x66b/0x7e0 net/smc/af_smc.c:306
 smc_close_non_accepted+0xd5/0x1f0 net/smc/af_smc.c:1857
 smc_close_cleanup_listen net/smc/smc_close.c:45 [inline]
 smc_close_active+0xb67/0xf10 net/smc/smc_close.c:225
 __smc_release+0x8d/0x7e0 net/smc/af_smc.c:282
 smc_release+0x2ce/0x560 net/smc/af_smc.c:349
 __sock_release+0xb9/0x250 net/socket.c:731
 sock_close+0x1c/0x30 net/socket.c:1534
 __fput+0x44f/0xa70 fs/file_table.c:469
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
 do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f815ed9c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc5e15ea38 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffc5e15eb20 RCX: 00007f815ed9c799
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000001b89f R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2f420000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f815f015fac R14: 00007f815f015fa8 R15: 00007f815f015fa0
 </TASK>