Extracting prog: 3m14.670334879s Minimizing prog: 13m32.942052648s Simplifying prog options: 7m24.015557109s Extracting C: 2m49.368736444s 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: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: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$inet_smc-bind$inet-listen-socket$inet_smc-connect$inet detailed listing: executing program 0: r0 = socket$inet_smc(0x2b, 0x1, 0x0) bind$inet(r0, &(0x7f0000000200)={0x2, 0x4e20, @loopback}, 0x10) listen(r0, 0x5) r1 = socket$inet_smc(0x2b, 0x1, 0x0) connect$inet(r1, &(0x7f0000000300)={0x2, 0x4e20, @loopback}, 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: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: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$inet_smc-bind$inet-listen-socket$inet_smc-connect$inet detailed listing: executing program 0: r0 = socket$inet_smc(0x2b, 0x1, 0x0) bind$inet(r0, &(0x7f0000000200)={0x2, 0x4e20, @loopback}, 0x10) listen(r0, 0x5) r1 = socket$inet_smc(0x2b, 0x1, 0x0) connect$inet(r1, &(0x7f0000000300)={0x2, 0x4e20, @loopback}, 0x10) program crashed: possible deadlock in smc_release single: successfully extracted reproducer found reproducer with 5 syscalls minimizing guilty program testing program (duration=1m32.56280625s, {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: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$inet_smc-bind$inet-listen-socket$inet_smc detailed listing: executing program 0: r0 = socket$inet_smc(0x2b, 0x1, 0x0) bind$inet(r0, &(0x7f0000000200)={0x2, 0x4e20, @loopback}, 0x10) listen(r0, 0x5) socket$inet_smc(0x2b, 0x1, 0x0) program did not crash testing program (duration=1m32.56280625s, {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: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$inet_smc-bind$inet-listen-connect$inet detailed listing: executing program 0: r0 = socket$inet_smc(0x2b, 0x1, 0x0) bind$inet(r0, &(0x7f0000000200)={0x2, 0x4e20, @loopback}, 0x10) listen(r0, 0x5) connect$inet(0xffffffffffffffff, &(0x7f0000000300)={0x2, 0x4e20, @loopback}, 0x10) program did not crash testing program (duration=1m32.56280625s, {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: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$inet_smc-bind$inet-socket$inet_smc-connect$inet detailed listing: executing program 0: r0 = socket$inet_smc(0x2b, 0x1, 0x0) bind$inet(r0, &(0x7f0000000200)={0x2, 0x4e20, @loopback}, 0x10) r1 = socket$inet_smc(0x2b, 0x1, 0x0) connect$inet(r1, &(0x7f0000000300)={0x2, 0x4e20, @loopback}, 0x10) program did not crash testing program (duration=1m32.56280625s, {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: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$inet_smc-listen-socket$inet_smc-connect$inet detailed listing: executing program 0: r0 = socket$inet_smc(0x2b, 0x1, 0x0) listen(r0, 0x5) r1 = socket$inet_smc(0x2b, 0x1, 0x0) connect$inet(r1, &(0x7f0000000300)={0x2, 0x4e20, @loopback}, 0x10) program did not crash testing program (duration=1m32.56280625s, {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: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}}): bind$inet-listen-socket$inet_smc-connect$inet detailed listing: executing program 0: bind$inet(0xffffffffffffffff, &(0x7f0000000200)={0x2, 0x4e20, @loopback}, 0x10) listen(0xffffffffffffffff, 0x5) r0 = socket$inet_smc(0x2b, 0x1, 0x0) connect$inet(r0, &(0x7f0000000300)={0x2, 0x4e20, @loopback}, 0x10) program did not crash testing program (duration=1m32.56280625s, {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: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$inet_smc-bind$inet-listen-socket$inet_smc-connect$inet detailed listing: executing program 0: r0 = socket$inet_smc(0x2b, 0x1, 0x0) bind$inet(r0, 0x0, 0x0) listen(r0, 0x5) r1 = socket$inet_smc(0x2b, 0x1, 0x0) connect$inet(r1, &(0x7f0000000300)={0x2, 0x4e20, @loopback}, 0x10) program did not crash testing program (duration=1m32.56280625s, {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: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$inet_smc-bind$inet-listen-socket$inet_smc-connect$inet detailed listing: executing program 0: r0 = socket$inet_smc(0x2b, 0x1, 0x0) bind$inet(r0, &(0x7f0000000200)={0x2, 0x4e20, @loopback}, 0x10) listen(r0, 0x5) r1 = socket$inet_smc(0x2b, 0x1, 0x0) connect$inet(r1, 0x0, 0x0) program did not crash extracting C reproducer testing compiled C program (duration=1m32.56280625s, {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: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$inet_smc-bind$inet-listen-socket$inet_smc-connect$inet program did not crash simplifying guilty program options testing program (duration=1m32.56280625s, {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: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$inet_smc-bind$inet-listen-socket$inet_smc-connect$inet detailed listing: executing program 0: r0 = socket$inet_smc(0x2b, 0x1, 0x0) bind$inet(r0, &(0x7f0000000200)={0x2, 0x4e20, @loopback}, 0x10) listen(r0, 0x5) r1 = socket$inet_smc(0x2b, 0x1, 0x0) connect$inet(r1, &(0x7f0000000300)={0x2, 0x4e20, @loopback}, 0x10) program crashed: possible deadlock in smc_release extracting C reproducer testing compiled C program (duration=1m32.56280625s, {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: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$inet_smc-bind$inet-listen-socket$inet_smc-connect$inet program did not crash testing program (duration=1m32.56280625s, {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$inet_smc-bind$inet-listen-socket$inet_smc-connect$inet detailed listing: executing program 0: r0 = socket$inet_smc(0x2b, 0x1, 0x0) bind$inet(r0, &(0x7f0000000200)={0x2, 0x4e20, @loopback}, 0x10) listen(r0, 0x5) r1 = socket$inet_smc(0x2b, 0x1, 0x0) connect$inet(r1, &(0x7f0000000300)={0x2, 0x4e20, @loopback}, 0x10) program crashed: possible deadlock in smc_release extracting C reproducer testing compiled C program (duration=1m32.56280625s, {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$inet_smc-bind$inet-listen-socket$inet_smc-connect$inet program did not crash testing program (duration=1m32.56280625s, {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$inet_smc-bind$inet-listen-socket$inet_smc-connect$inet detailed listing: executing program 0: r0 = socket$inet_smc(0x2b, 0x1, 0x0) bind$inet(r0, &(0x7f0000000200)={0x2, 0x4e20, @loopback}, 0x10) listen(r0, 0x5) r1 = socket$inet_smc(0x2b, 0x1, 0x0) connect$inet(r1, &(0x7f0000000300)={0x2, 0x4e20, @loopback}, 0x10) program did not crash validation run: crashed=false testing program (duration=1m32.56280625s, {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$inet_smc-bind$inet-listen-socket$inet_smc-connect$inet detailed listing: executing program 0: r0 = socket$inet_smc(0x2b, 0x1, 0x0) bind$inet(r0, &(0x7f0000000200)={0x2, 0x4e20, @loopback}, 0x10) listen(r0, 0x5) r1 = socket$inet_smc(0x2b, 0x1, 0x0) connect$inet(r1, &(0x7f0000000300)={0x2, 0x4e20, @loopback}, 0x10) program crashed: possible deadlock in smc_release validation run: crashed=true testing program (duration=1m32.56280625s, {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$inet_smc-bind$inet-listen-socket$inet_smc-connect$inet detailed listing: executing program 0: r0 = socket$inet_smc(0x2b, 0x1, 0x0) bind$inet(r0, &(0x7f0000000200)={0x2, 0x4e20, @loopback}, 0x10) listen(r0, 0x5) r1 = socket$inet_smc(0x2b, 0x1, 0x0) connect$inet(r1, &(0x7f0000000300)={0x2, 0x4e20, @loopback}, 0x10) program crashed: possible deadlock in smc_release validation run: crashed=true testing program (duration=1m32.56280625s, {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$inet_smc-bind$inet-listen-socket$inet_smc-connect$inet detailed listing: executing program 0: r0 = socket$inet_smc(0x2b, 0x1, 0x0) bind$inet(r0, &(0x7f0000000200)={0x2, 0x4e20, @loopback}, 0x10) listen(r0, 0x5) r1 = socket$inet_smc(0x2b, 0x1, 0x0) connect$inet(r1, &(0x7f0000000300)={0x2, 0x4e20, @loopback}, 0x10) program crashed: possible deadlock in smc_release validation run: crashed=true reproducing took 31m33.82643926s repro crashed as (corrupted=false): ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.690/6648 is trying to acquire lock: ffff8880256216e8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] ffff8880256216e8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] ffff8880256216e8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: start_flush_work kernel/workqueue.c:4354 [inline] ffff8880256216e8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: __flush_work+0x101/0xca0 kernel/workqueue.c:4412 but task is already holding lock: ffff88807ce88ee0 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x24d/0x550 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:3830 smc_listen_out+0xd4/0x3d0 net/smc/af_smc.c:1934 smc_listen_work+0x81d/0x1410 net/smc/af_smc.c:-1 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 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:3209 [inline] check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942 touch_work_lockdep_map kernel/workqueue.c:4126 [inline] start_flush_work kernel/workqueue.c:4380 [inline] __flush_work+0x74c/0xca0 kernel/workqueue.c:4412 __cancel_work_sync+0xbf/0x110 kernel/workqueue.c:4568 smc_clcsock_release+0x60/0xf0 net/smc/smc_close.c:29 __smc_release+0x64e/0x7c0 net/smc/af_smc.c:318 smc_close_non_accepted+0xd5/0x1f0 net/smc/af_smc.c:1866 smc_close_cleanup_listen net/smc/smc_close.c:45 [inline] smc_close_active+0xb30/0xf20 net/smc/smc_close.c:225 __smc_release+0x9c/0x7c0 net/smc/af_smc.c:294 smc_release+0x2c5/0x550 net/smc/af_smc.c:361 __sock_release+0xa0/0x1f0 net/socket.c:735 sock_close+0x1c/0x30 net/socket.c:1526 __fput+0x418/0xa50 fs/file_table.c:512 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:70 [inline] exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.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 *** locks held by syz.0.690/6648: 3, last CPU#0: #0: ffff88805a8a52c0 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #0: ffff88805a8a52c0 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: __sock_release+0x7a/0x1f0 net/socket.c:734 #1: ffff88807ce88ee0 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x24d/0x550 net/smc/af_smc.c:-1 #2: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #2: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #2: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: start_flush_work kernel/workqueue.c:4354 [inline] #2: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x101/0xca0 kernel/workqueue.c:4412 stack backtrace: CPU: 0 UID: 0 PID: 6648 Comm: syz.0.690 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2087 check_noncircular+0x12f/0x150 kernel/locking/lockdep.c:2219 check_prev_add kernel/locking/lockdep.c:3209 [inline] check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942 touch_work_lockdep_map kernel/workqueue.c:4126 [inline] start_flush_work kernel/workqueue.c:4380 [inline] __flush_work+0x74c/0xca0 kernel/workqueue.c:4412 __cancel_work_sync+0xbf/0x110 kernel/workqueue.c:4568 smc_clcsock_release+0x60/0xf0 net/smc/smc_close.c:29 __smc_release+0x64e/0x7c0 net/smc/af_smc.c:318 smc_close_non_accepted+0xd5/0x1f0 net/smc/af_smc.c:1866 smc_close_cleanup_listen net/smc/smc_close.c:45 [inline] smc_close_active+0xb30/0xf20 net/smc/smc_close.c:225 __smc_release+0x9c/0x7c0 net/smc/af_smc.c:294 smc_release+0x2c5/0x550 net/smc/af_smc.c:361 __sock_release+0xa0/0x1f0 net/socket.c:735 sock_close+0x1c/0x30 net/socket.c:1526 __fput+0x418/0xa50 fs/file_table.c:512 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:70 [inline] exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fda0719e159 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:00007ffc3a3b3688 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007ffc3a3b3770 RCX: 00007fda0719e159 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 000000000001e0c4 R08: 0000000000000001 R09: 0000000000000000 R10: 0000001b30120000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fda07425fac R14: 00007fda07425fa8 R15: 00007fda07425fa0 final repro crashed as (corrupted=false): ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.690/6648 is trying to acquire lock: ffff8880256216e8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] ffff8880256216e8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] ffff8880256216e8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: start_flush_work kernel/workqueue.c:4354 [inline] ffff8880256216e8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: __flush_work+0x101/0xca0 kernel/workqueue.c:4412 but task is already holding lock: ffff88807ce88ee0 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x24d/0x550 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:3830 smc_listen_out+0xd4/0x3d0 net/smc/af_smc.c:1934 smc_listen_work+0x81d/0x1410 net/smc/af_smc.c:-1 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 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:3209 [inline] check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942 touch_work_lockdep_map kernel/workqueue.c:4126 [inline] start_flush_work kernel/workqueue.c:4380 [inline] __flush_work+0x74c/0xca0 kernel/workqueue.c:4412 __cancel_work_sync+0xbf/0x110 kernel/workqueue.c:4568 smc_clcsock_release+0x60/0xf0 net/smc/smc_close.c:29 __smc_release+0x64e/0x7c0 net/smc/af_smc.c:318 smc_close_non_accepted+0xd5/0x1f0 net/smc/af_smc.c:1866 smc_close_cleanup_listen net/smc/smc_close.c:45 [inline] smc_close_active+0xb30/0xf20 net/smc/smc_close.c:225 __smc_release+0x9c/0x7c0 net/smc/af_smc.c:294 smc_release+0x2c5/0x550 net/smc/af_smc.c:361 __sock_release+0xa0/0x1f0 net/socket.c:735 sock_close+0x1c/0x30 net/socket.c:1526 __fput+0x418/0xa50 fs/file_table.c:512 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:70 [inline] exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.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 *** locks held by syz.0.690/6648: 3, last CPU#0: #0: ffff88805a8a52c0 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #0: ffff88805a8a52c0 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: __sock_release+0x7a/0x1f0 net/socket.c:734 #1: ffff88807ce88ee0 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x24d/0x550 net/smc/af_smc.c:-1 #2: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #2: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #2: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: start_flush_work kernel/workqueue.c:4354 [inline] #2: ffffffff8ed5c8a0 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x101/0xca0 kernel/workqueue.c:4412 stack backtrace: CPU: 0 UID: 0 PID: 6648 Comm: syz.0.690 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2087 check_noncircular+0x12f/0x150 kernel/locking/lockdep.c:2219 check_prev_add kernel/locking/lockdep.c:3209 [inline] check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942 touch_work_lockdep_map kernel/workqueue.c:4126 [inline] start_flush_work kernel/workqueue.c:4380 [inline] __flush_work+0x74c/0xca0 kernel/workqueue.c:4412 __cancel_work_sync+0xbf/0x110 kernel/workqueue.c:4568 smc_clcsock_release+0x60/0xf0 net/smc/smc_close.c:29 __smc_release+0x64e/0x7c0 net/smc/af_smc.c:318 smc_close_non_accepted+0xd5/0x1f0 net/smc/af_smc.c:1866 smc_close_cleanup_listen net/smc/smc_close.c:45 [inline] smc_close_active+0xb30/0xf20 net/smc/smc_close.c:225 __smc_release+0x9c/0x7c0 net/smc/af_smc.c:294 smc_release+0x2c5/0x550 net/smc/af_smc.c:361 __sock_release+0xa0/0x1f0 net/socket.c:735 sock_close+0x1c/0x30 net/socket.c:1526 __fput+0x418/0xa50 fs/file_table.c:512 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:70 [inline] exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fda0719e159 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:00007ffc3a3b3688 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007ffc3a3b3770 RCX: 00007fda0719e159 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 000000000001e0c4 R08: 0000000000000001 R09: 0000000000000000 R10: 0000001b30120000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fda07425fac R14: 00007fda07425fa8 R15: 00007fda07425fa0