======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc1-syzkaller-00034-g92514ef226f5 #0 Not tainted
------------------------------------------------------
syz.6.367/7307 is trying to acquire lock:
ffff88807bcf14d0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: touch_work_lockdep_map kernel/workqueue.c:3920 [inline]
ffff88807bcf14d0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: start_flush_work kernel/workqueue.c:4174 [inline]
ffff88807bcf14d0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: __flush_work+0x4db/0xcd0 kernel/workqueue.c:4206

but task is already holding lock:
ffff88807bcf0258 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x378/0x5f0 net/smc/af_smc.c:336

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+0x3a/0xf0 net/core/sock.c:3645
       smc_listen_out+0x202/0x4a0 net/smc/af_smc.c:1908
       smc_listen_out_connected net/smc/af_smc.c:1928 [inline]
       smc_listen_work+0x5b5/0x50b0 net/smc/af_smc.c:2450
       process_one_work+0x9c8/0x1ba0 kernel/workqueue.c:3236
       process_scheduled_works kernel/workqueue.c:3317 [inline]
       worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
       kthread+0x3b2/0x750 kernel/kthread.c:464
       ret_from_fork+0x48/0x80 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 kernel/locking/lockdep.c:3906 [inline]
       __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5228
       lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851
       touch_work_lockdep_map kernel/workqueue.c:3920 [inline]
       start_flush_work kernel/workqueue.c:4174 [inline]
       __flush_work+0x4e5/0xcd0 kernel/workqueue.c:4206
       __cancel_work_sync+0x10c/0x130 kernel/workqueue.c:4362
       smc_clcsock_release+0x5f/0xe0 net/smc/smc_close.c:29
       __smc_release+0x5c2/0x880 net/smc/af_smc.c:301
       smc_close_non_accepted+0xda/0x200 net/smc/af_smc.c:1839
       smc_close_cleanup_listen net/smc/smc_close.c:45 [inline]
       smc_close_active+0xc3c/0x1070 net/smc/smc_close.c:225
       __smc_release+0x634/0x880 net/smc/af_smc.c:277
       smc_release+0x1fc/0x5f0 net/smc/af_smc.c:344
       __sock_release+0xb3/0x270 net/socket.c:642
       sock_close+0x1c/0x30 net/socket.c:1393
       __fput+0x402/0xb70 fs/file_table.c:448
       task_work_run+0x151/0x250 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+0x27b/0x2a0 kernel/entry/common.c:218
       do_syscall_64+0xda/0x250 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.6.367/7307:
 #0: ffff88807b52b808 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:865 [inline]
 #0: ffff88807b52b808 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: __sock_release+0x86/0x270 net/socket.c:641
 #1: ffff88807bcf0258 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x378/0x5f0 net/smc/af_smc.c:336
 #2: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #2: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #2: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: start_flush_work kernel/workqueue.c:4148 [inline]
 #2: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x107/0xcd0 kernel/workqueue.c:4206

stack backtrace:
CPU: 1 UID: 0 PID: 7307 Comm: syz.6.367 Not tainted 6.14.0-rc1-syzkaller-00034-g92514ef226f5 #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+0x116/0x1f0 lib/dump_stack.c:120
 print_circular_bug+0x490/0x760 kernel/locking/lockdep.c:2076
 check_noncircular+0x31a/0x400 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 kernel/locking/lockdep.c:3906 [inline]
 __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5228
 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851
 touch_work_lockdep_map kernel/workqueue.c:3920 [inline]
 start_flush_work kernel/workqueue.c:4174 [inline]
 __flush_work+0x4e5/0xcd0 kernel/workqueue.c:4206
 __cancel_work_sync+0x10c/0x130 kernel/workqueue.c:4362
 smc_clcsock_release+0x5f/0xe0 net/smc/smc_close.c:29
 __smc_release+0x5c2/0x880 net/smc/af_smc.c:301
 smc_close_non_accepted+0xda/0x200 net/smc/af_smc.c:1839
 smc_close_cleanup_listen net/smc/smc_close.c:45 [inline]
 smc_close_active+0xc3c/0x1070 net/smc/smc_close.c:225
 __smc_release+0x634/0x880 net/smc/af_smc.c:277
 smc_release+0x1fc/0x5f0 net/smc/af_smc.c:344
 __sock_release+0xb3/0x270 net/socket.c:642
 sock_close+0x1c/0x30 net/socket.c:1393
 __fput+0x402/0xb70 fs/file_table.c:448
 task_work_run+0x151/0x250 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+0x27b/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3cf358cde9
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:00007ffc5bd7b8b8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000002ae53 RCX: 00007f3cf358cde9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f3cf37a7ba0 R08: 0000000000000001 R09: 000000085bd7bbaf
R10: 00007f3cf3400000 R11: 0000000000000246 R12: 00007f3cf37a608c
R13: 00007f3cf37a6080 R14: ffffffffffffffff R15: 00007ffc5bd7b9d0
 </TASK>