======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz-executor171/5612 is trying to acquire lock:
ffff888042e2f7b8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
ffff888042e2f7b8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
ffff888042e2f7b8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: start_flush_work kernel/workqueue.c:4354 [inline]
ffff888042e2f7b8 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: __flush_work+0x101/0xd70 kernel/workqueue.c:4412

but task is already holding lock:
ffff888035d31298 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x22f/0x580 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+0x41/0x130 net/core/sock.c:3865
       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/0x470 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+0x6c5/0xd70 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+0x662/0x7d0 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+0xb59/0xf50 net/smc/smc_close.c:225
       __smc_release+0x9e/0x7d0 net/smc/af_smc.c:294
       smc_release+0x2cd/0x580 net/smc/af_smc.c:361
       __sock_release+0xa0/0x1f0 net/socket.c:735
       sock_close+0x1c/0x30 net/socket.c:1526
       __fput+0x41f/0xa80 fs/file_table.c:512
       fput_close_sync+0x11f/0x240 fs/file_table.c:618
       filp_close_sync+0x6e/0xa0 fs/open.c:1573
       __range_close fs/file.c:919 [inline]
       __do_sys_close_range fs/file.c:1003 [inline]
       __se_sys_close_range+0xa7d/0xf00 fs/file.c:954
       do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
       do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
       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-executor171/5612: 3, last CPU#0:
 #0: ffff888046839038 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
 #0: ffff888046839038 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: __sock_release+0x7a/0x1f0 net/socket.c:734
 #1: ffff888035d31298 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x22f/0x580 net/smc/af_smc.c:-1
 #2: ffffffff8f3c3d80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #2: ffffffff8f3c3d80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #2: ffffffff8f3c3d80 (rcu_read_lock){....}-{1:3}, at: start_flush_work kernel/workqueue.c:4354 [inline]
 #2: ffffffff8f3c3d80 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x101/0xd70 kernel/workqueue.c:4412

stack backtrace:
CPU: 0 UID: 0 PID: 5612 Comm: syz-executor171 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
 <TASK>
 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+0x6c5/0xd70 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+0x662/0x7d0 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+0xb59/0xf50 net/smc/smc_close.c:225
 __smc_release+0x9e/0x7d0 net/smc/af_smc.c:294
 smc_release+0x2cd/0x580 net/smc/af_smc.c:361
 __sock_release+0xa0/0x1f0 net/socket.c:735
 sock_close+0x1c/0x30 net/socket.c:1526
 __fput+0x41f/0xa80 fs/file_table.c:512
 fput_close_sync+0x11f/0x240 fs/file_table.c:618
 filp_close_sync+0x6e/0xa0 fs/open.c:1573
 __range_close fs/file.c:919 [inline]
 __do_sys_close_range fs/file.c:1003 [inline]
 __se_sys_close_range+0xa7d/0xf00 fs/file.c:954
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9ae652cdc9
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd19324f78 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9ae652cdc9
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000003
RBP: 000000000001923e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd19324fac
R13: 431bde82d7b634db R14: 00007ffd19324fc0 R15: 0000000000000002
 </TASK>