Extracting prog: 42.806581793s
Minimizing prog: 14m27.151723484s
Simplifying prog options: 3m48.609927663s
Extracting C: 1m34.897607155s
Simplifying C: 0s


extracting reproducer from 4 programs
first checking the prog from the crash report
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_mptcp-pselect6-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000040)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r0, 0x0)
r1 = socket$inet_mptcp(0x2, 0x1, 0x106)
pselect6(0x40, &(0x7f0000000140)={0x9, 0x100000001, 0xf, 0xb, 0x9, 0x81, 0x60a82359}, 0x0, 0x0, 0x0, 0x0)
connect$inet(r1, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program crashed: possible deadlock in smc_release
single: successfully extracted reproducer
found reproducer with 8 syscalls
minimizing guilty program
testing program (duration=53.18083393s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_mptcp-pselect6
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000040)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r0, 0x0)
socket$inet_mptcp(0x2, 0x1, 0x106)
pselect6(0x40, &(0x7f0000000140)={0x9, 0x100000001, 0xf, 0xb, 0x9, 0x81, 0x60a82359}, 0x0, 0x0, 0x0, 0x0)

program did not crash
testing program (duration=53.18083393s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_mptcp-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000040)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r0, 0x0)
r1 = socket$inet_mptcp(0x2, 0x1, 0x106)
connect$inet(r1, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program did not crash
testing program (duration=53.18083393s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet6_tcp-close-socket-bind$inet6-listen-pselect6-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000040)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r0, 0x0)
pselect6(0x40, &(0x7f0000000140)={0x9, 0x100000001, 0xf, 0xb, 0x9, 0x81, 0x60a82359}, 0x0, 0x0, 0x0, 0x0)
connect$inet(0xffffffffffffffff, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program did not crash
testing program (duration=53.18083393s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet6_tcp-close-socket-bind$inet6-socket$inet_mptcp-pselect6-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000040)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
r1 = socket$inet_mptcp(0x2, 0x1, 0x106)
pselect6(0x40, &(0x7f0000000140)={0x9, 0x100000001, 0xf, 0xb, 0x9, 0x81, 0x60a82359}, 0x0, 0x0, 0x0, 0x0)
connect$inet(r1, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program did not crash
testing program (duration=53.18083393s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet6_tcp-close-socket-listen-socket$inet_mptcp-pselect6-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
socket(0x2b, 0x1, 0x1)
listen(r0, 0x0)
r1 = socket$inet_mptcp(0x2, 0x1, 0x106)
pselect6(0x40, &(0x7f0000000140)={0x9, 0x100000001, 0xf, 0xb, 0x9, 0x81, 0x60a82359}, 0x0, 0x0, 0x0, 0x0)
connect$inet(r1, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program did not crash
testing program (duration=53.18083393s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet6_tcp-close-bind$inet6-listen-socket$inet_mptcp-pselect6-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
bind$inet6(r0, &(0x7f0000000040)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r0, 0x0)
r1 = socket$inet_mptcp(0x2, 0x1, 0x106)
pselect6(0x40, &(0x7f0000000140)={0x9, 0x100000001, 0xf, 0xb, 0x9, 0x81, 0x60a82359}, 0x0, 0x0, 0x0, 0x0)
connect$inet(r1, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program did not crash
testing program (duration=53.18083393s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet6_tcp-socket-bind$inet6-listen-socket$inet_mptcp-pselect6-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000040)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r0, 0x0)
r1 = socket$inet_mptcp(0x2, 0x1, 0x106)
pselect6(0x40, &(0x7f0000000140)={0x9, 0x100000001, 0xf, 0xb, 0x9, 0x81, 0x60a82359}, 0x0, 0x0, 0x0, 0x0)
connect$inet(r1, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program did not crash
testing program (duration=53.18083393s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): close-socket-bind$inet6-listen-socket$inet_mptcp-pselect6-connect$inet
detailed listing:
executing program 0:
close(0xffffffffffffffff)
socket(0x2b, 0x1, 0x1)
bind$inet6(0xffffffffffffffff, &(0x7f0000000040)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(0xffffffffffffffff, 0x0)
r0 = socket$inet_mptcp(0x2, 0x1, 0x106)
pselect6(0x40, &(0x7f0000000140)={0x9, 0x100000001, 0xf, 0xb, 0x9, 0x81, 0x60a82359}, 0x0, 0x0, 0x0, 0x0)
connect$inet(r0, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program did not crash
testing program (duration=53.18083393s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_mptcp-pselect6-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
socket(0x2b, 0x1, 0x1)
bind$inet6(r0, 0x0, 0x0)
listen(r0, 0x0)
r1 = socket$inet_mptcp(0x2, 0x1, 0x106)
pselect6(0x40, &(0x7f0000000140)={0x9, 0x100000001, 0xf, 0xb, 0x9, 0x81, 0x60a82359}, 0x0, 0x0, 0x0, 0x0)
connect$inet(r1, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program did not crash
testing program (duration=53.18083393s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_mptcp-pselect6-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000040)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r0, 0x0)
r1 = socket$inet_mptcp(0x2, 0x1, 0x106)
pselect6(0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
connect$inet(r1, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program did not crash
testing program (duration=53.18083393s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_mptcp-pselect6-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000040)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r0, 0x0)
r1 = socket$inet_mptcp(0x2, 0x1, 0x106)
pselect6(0x40, &(0x7f0000000140)={0x9, 0x100000001, 0xf, 0xb, 0x9, 0x81, 0x60a82359}, 0x0, 0x0, 0x0, 0x0)
connect$inet(r1, 0x0, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=53.18083393s, {Threaded:true Repeat:true RepeatTimes:0 Procs:6 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_mptcp-pselect6-connect$inet
program did not crash
simplifying guilty program options
testing program (duration=53.18083393s, {Threaded:false Repeat:true RepeatTimes:0 Procs:6 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_mptcp-pselect6-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000040)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r0, 0x0)
r1 = socket$inet_mptcp(0x2, 0x1, 0x106)
pselect6(0x40, &(0x7f0000000140)={0x9, 0x100000001, 0xf, 0xb, 0x9, 0x81, 0x60a82359}, 0x0, 0x0, 0x0, 0x0)
connect$inet(r1, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program did not crash
testing program (duration=53.18083393s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_mptcp-pselect6-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000040)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r0, 0x0)
r1 = socket$inet_mptcp(0x2, 0x1, 0x106)
pselect6(0x40, &(0x7f0000000140)={0x9, 0x100000001, 0xf, 0xb, 0x9, 0x81, 0x60a82359}, 0x0, 0x0, 0x0, 0x0)
connect$inet(r1, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program did not crash
testing program (duration=53.18083393s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet6_tcp-close-socket-bind$inet6-listen-socket$inet_mptcp-pselect6-connect$inet
detailed listing:
executing program 0:
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
close(r0)
socket(0x2b, 0x1, 0x1)
bind$inet6(r0, &(0x7f0000000040)={0xa, 0x4e22, 0x0, @empty}, 0x1c)
listen(r0, 0x0)
r1 = socket$inet_mptcp(0x2, 0x1, 0x106)
pselect6(0x40, &(0x7f0000000140)={0x9, 0x100000001, 0xf, 0xb, 0x9, 0x81, 0x60a82359}, 0x0, 0x0, 0x0, 0x0)
connect$inet(r1, &(0x7f0000000000)={0x2, 0x4e22, @local}, 0x10)

program did not crash
reproducing took 20m33.465878711s
repro crashed as (corrupted=false):
======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc1-syzkaller-00026-gd009de7d5428 #0 Not tainted
------------------------------------------------------
syz.5.36/6640 is trying to acquire lock:
ffff888011be70d0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
ffff888011be70d0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
ffff888011be70d0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: start_flush_work kernel/workqueue.c:4148 [inline]
ffff888011be70d0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: __flush_work+0xe9/0xc60 kernel/workqueue.c:4206

but task is already holding lock:
ffff888011be52d8 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x234/0x540

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_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
       lock_sock_nested+0x48/0x100 net/core/sock.c:3645
       smc_listen_out+0x11b/0x3e0 net/smc/af_smc.c:1908
       process_one_work kernel/workqueue.c:3236 [inline]
       process_scheduled_works+0xa68/0x1840 kernel/workqueue.c:3317
       worker_thread+0x870/0xd30 kernel/workqueue.c:3398
       kthread+0x7ab/0x920 kernel/kthread.c:464
       ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

-> #0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3163 [inline]
       check_prevs_add kernel/locking/lockdep.c:3282 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
       __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
       touch_work_lockdep_map kernel/workqueue.c:3920 [inline]
       start_flush_work kernel/workqueue.c:4174 [inline]
       __flush_work+0x739/0xc60 kernel/workqueue.c:4206
       __cancel_work_sync+0xbc/0x110 kernel/workqueue.c:4362
       smc_clcsock_release+0x62/0xf0 net/smc/smc_close.c:29
       __smc_release+0x683/0x800 net/smc/af_smc.c:301
       smc_close_non_accepted+0xd8/0x1f0 net/smc/af_smc.c:1839
       smc_close_cleanup_listen net/smc/smc_close.c:45 [inline]
       smc_close_active+0xadb/0xe90 net/smc/smc_close.c:225
       __smc_release+0xa0/0x800 net/smc/af_smc.c:277
       smc_release+0x2dc/0x540 net/smc/af_smc.c:344
       __sock_release net/socket.c:642 [inline]
       sock_close+0xbe/0x240 net/socket.c:1393
       __fput+0x3eb/0x9f0 fs/file_table.c:448
       task_work_run+0x251/0x310 kernel/task_work.c:227
       resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
       exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
       exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
       __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
       syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
       do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
       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.5.36/6640:
 #0: ffff8880750fe808 (&sb->s_type->i_mutex_key#10
){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:865 [inline]
){+.+.}-{4:4}, at: __sock_release net/socket.c:641 [inline]
){+.+.}-{4:4}, at: sock_close+0x90/0x240 net/socket.c:1393
 #1: ffff888011be52d8 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x234/0x540
 #2: ffffffff8e9387e0 (
rcu_read_lock){....}-{1:3}
, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
, at: start_flush_work kernel/workqueue.c:4148 [inline]
, at: __flush_work+0xe9/0xc60 kernel/workqueue.c:4206

stack backtrace:
CPU: 1 UID: 0 PID: 6640 Comm: syz.5.36 Not tainted 6.14.0-rc1-syzkaller-00026-gd009de7d5428 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208
 check_prev_add kernel/locking/lockdep.c:3163 [inline]
 check_prevs_add kernel/locking/lockdep.c:3282 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
 touch_work_lockdep_map kernel/workqueue.c:3920 [inline]
 start_flush_work kernel/workqueue.c:4174 [inline]
 __flush_work+0x739/0xc60 kernel/workqueue.c:4206
 __cancel_work_sync+0xbc/0x110 kernel/workqueue.c:4362
 smc_clcsock_release+0x62/0xf0 net/smc/smc_close.c:29
 __smc_release+0x683/0x800 net/smc/af_smc.c:301
 smc_close_non_accepted+0xd8/0x1f0 net/smc/af_smc.c:1839
 smc_close_cleanup_listen net/smc/smc_close.c:45 [inline]
 smc_close_active+0xadb/0xe90 net/smc/smc_close.c:225
 __smc_release+0xa0/0x800 net/smc/af_smc.c:277
 smc_release+0x2dc/0x540 net/smc/af_smc.c:344
 __sock_release net/socket.c:642 [inline]
 sock_close+0xbe/0x240 net/socket.c:1393
 __fput+0x3eb/0x9f0 fs/file_table.c:448
 task_work_run+0x251/0x310 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f89f738cda9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc793e90c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f89f75a7ba0 RCX: 00007f89f738cda9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f89f75a7ba0 R08: 0000000000000000 R09: 00007ffc793e93cf
R10: 000000000003fda0 R11: 0000000000000246 R12: 00000000008ae603
R13: 00007f89f75a6080 R14: 0000000000000032 R15: ffffffffffffffff
 </TASK>

final repro crashed as (corrupted=false):
======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc1-syzkaller-00026-gd009de7d5428 #0 Not tainted
------------------------------------------------------
syz.5.36/6640 is trying to acquire lock:
ffff888011be70d0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
ffff888011be70d0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
ffff888011be70d0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: start_flush_work kernel/workqueue.c:4148 [inline]
ffff888011be70d0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: __flush_work+0xe9/0xc60 kernel/workqueue.c:4206

but task is already holding lock:
ffff888011be52d8 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x234/0x540

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_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
       lock_sock_nested+0x48/0x100 net/core/sock.c:3645
       smc_listen_out+0x11b/0x3e0 net/smc/af_smc.c:1908
       process_one_work kernel/workqueue.c:3236 [inline]
       process_scheduled_works+0xa68/0x1840 kernel/workqueue.c:3317
       worker_thread+0x870/0xd30 kernel/workqueue.c:3398
       kthread+0x7ab/0x920 kernel/kthread.c:464
       ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

-> #0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3163 [inline]
       check_prevs_add kernel/locking/lockdep.c:3282 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
       __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
       touch_work_lockdep_map kernel/workqueue.c:3920 [inline]
       start_flush_work kernel/workqueue.c:4174 [inline]
       __flush_work+0x739/0xc60 kernel/workqueue.c:4206
       __cancel_work_sync+0xbc/0x110 kernel/workqueue.c:4362
       smc_clcsock_release+0x62/0xf0 net/smc/smc_close.c:29
       __smc_release+0x683/0x800 net/smc/af_smc.c:301
       smc_close_non_accepted+0xd8/0x1f0 net/smc/af_smc.c:1839
       smc_close_cleanup_listen net/smc/smc_close.c:45 [inline]
       smc_close_active+0xadb/0xe90 net/smc/smc_close.c:225
       __smc_release+0xa0/0x800 net/smc/af_smc.c:277
       smc_release+0x2dc/0x540 net/smc/af_smc.c:344
       __sock_release net/socket.c:642 [inline]
       sock_close+0xbe/0x240 net/socket.c:1393
       __fput+0x3eb/0x9f0 fs/file_table.c:448
       task_work_run+0x251/0x310 kernel/task_work.c:227
       resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
       exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
       exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
       __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
       syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
       do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
       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.5.36/6640:
 #0: ffff8880750fe808 (&sb->s_type->i_mutex_key#10
){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:865 [inline]
){+.+.}-{4:4}, at: __sock_release net/socket.c:641 [inline]
){+.+.}-{4:4}, at: sock_close+0x90/0x240 net/socket.c:1393
 #1: ffff888011be52d8 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x234/0x540
 #2: ffffffff8e9387e0 (
rcu_read_lock){....}-{1:3}
, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
, at: start_flush_work kernel/workqueue.c:4148 [inline]
, at: __flush_work+0xe9/0xc60 kernel/workqueue.c:4206

stack backtrace:
CPU: 1 UID: 0 PID: 6640 Comm: syz.5.36 Not tainted 6.14.0-rc1-syzkaller-00026-gd009de7d5428 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208
 check_prev_add kernel/locking/lockdep.c:3163 [inline]
 check_prevs_add kernel/locking/lockdep.c:3282 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
 touch_work_lockdep_map kernel/workqueue.c:3920 [inline]
 start_flush_work kernel/workqueue.c:4174 [inline]
 __flush_work+0x739/0xc60 kernel/workqueue.c:4206
 __cancel_work_sync+0xbc/0x110 kernel/workqueue.c:4362
 smc_clcsock_release+0x62/0xf0 net/smc/smc_close.c:29
 __smc_release+0x683/0x800 net/smc/af_smc.c:301
 smc_close_non_accepted+0xd8/0x1f0 net/smc/af_smc.c:1839
 smc_close_cleanup_listen net/smc/smc_close.c:45 [inline]
 smc_close_active+0xadb/0xe90 net/smc/smc_close.c:225
 __smc_release+0xa0/0x800 net/smc/af_smc.c:277
 smc_release+0x2dc/0x540 net/smc/af_smc.c:344
 __sock_release net/socket.c:642 [inline]
 sock_close+0xbe/0x240 net/socket.c:1393
 __fput+0x3eb/0x9f0 fs/file_table.c:448
 task_work_run+0x251/0x310 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f89f738cda9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc793e90c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f89f75a7ba0 RCX: 00007f89f738cda9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f89f75a7ba0 R08: 0000000000000000 R09: 00007ffc793e93cf
R10: 000000000003fda0 R11: 0000000000000246 R12: 00000000008ae603
R13: 00007f89f75a6080 R14: 0000000000000032 R15: ffffffffffffffff
 </TASK>