======================================================
WARNING: possible circular locking dependency detected
6.1.92-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.0/3924 is trying to acquire lock:
ffff88807ccc1450 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: __flush_work+0xe5/0xad0 kernel/workqueue.c:3072

but task is already holding lock:
ffff88807ccc0130 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x22d/0x530

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+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       lock_sock_nested+0x44/0x100 net/core/sock.c:3485
       smc_listen_out+0x113/0x3d0 net/smc/af_smc.c:1882
       process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
       worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
       kthread+0x28d/0x320 kernel/kthread.c:376
       ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

-> #0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3090 [inline]
       check_prevs_add kernel/locking/lockdep.c:3209 [inline]
       validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
       __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       __flush_work+0xfe/0xad0 kernel/workqueue.c:3072
       __cancel_work_timer+0x519/0x6a0 kernel/workqueue.c:3163
       smc_clcsock_release+0x5e/0xe0 net/smc/smc_close.c:29
       __smc_release+0x678/0x7f0 net/smc/af_smc.c:300
       smc_close_non_accepted+0xd4/0x1e0 net/smc/af_smc.c:1816
       smc_close_cleanup_listen net/smc/smc_close.c:45 [inline]
       smc_close_active+0xa75/0xe20 net/smc/smc_close.c:225
       __smc_release+0xa0/0x7f0 net/smc/af_smc.c:276
       smc_release+0x2d5/0x530 net/smc/af_smc.c:343
       __sock_release net/socket.c:654 [inline]
       sock_close+0xcd/0x230 net/socket.c:1400
       __fput+0x3b7/0x890 fs/file_table.c:320
       task_work_run+0x246/0x300 kernel/task_work.c:179
       resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
       exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177
       exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
       __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
       syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
       do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

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 ***

2 locks held by syz-executor.0/3924:
 #0: ffff888070592010 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
 #0: ffff888070592010 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release net/socket.c:653 [inline]
 #0: ffff888070592010 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: sock_close+0x98/0x230 net/socket.c:1400
 #1: ffff88807ccc0130 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x22d/0x530

stack backtrace:
CPU: 1 PID: 3924 Comm: syz-executor.0 Not tainted 6.1.92-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170
 check_prev_add kernel/locking/lockdep.c:3090 [inline]
 check_prevs_add kernel/locking/lockdep.c:3209 [inline]
 validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
 __flush_work+0xfe/0xad0 kernel/workqueue.c:3072
 __cancel_work_timer+0x519/0x6a0 kernel/workqueue.c:3163
 smc_clcsock_release+0x5e/0xe0 net/smc/smc_close.c:29
 __smc_release+0x678/0x7f0 net/smc/af_smc.c:300
 smc_close_non_accepted+0xd4/0x1e0 net/smc/af_smc.c:1816
 smc_close_cleanup_listen net/smc/smc_close.c:45 [inline]
 smc_close_active+0xa75/0xe20 net/smc/smc_close.c:225
 __smc_release+0xa0/0x7f0 net/smc/af_smc.c:276
 smc_release+0x2d5/0x530 net/smc/af_smc.c:343
 __sock_release net/socket.c:654 [inline]
 sock_close+0xcd/0x230 net/socket.c:1400
 __fput+0x3b7/0x890 fs/file_table.c:320
 task_work_run+0x246/0x300 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f764f67bc9a
Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 03 7f 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 63 7f 02 00 8b 44 24
RSP: 002b:00007ffc220c04a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 00007f764f67bc9a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 0000000000000032 R08: 0000001b2c760000 R09: 00007f764f7abf8c
R10: 00007ffc220c05f0 R11: 0000000000000293 R12: 00007f764f2003f8
R13: ffffffffffffffff R14: 00007f764f200000 R15: 0000000000013a51
 </TASK>