======================================================
WARNING: possible circular locking dependency detected
6.12.0-rc3-syzkaller-gc964ced77262 #0 Not tainted
------------------------------------------------------
syz-executor.0/28763 is trying to acquire lock:
ffff88801218d9d0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
ffff88801218d9d0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
ffff88801218d9d0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: start_flush_work kernel/workqueue.c:4123 [inline]
ffff88801218d9d0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: __flush_work+0xe7/0xc50 kernel/workqueue.c:4181

but task is already holding lock:
ffff88802fd0bbd8 (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:5825
       lock_sock_nested+0x48/0x100 net/core/sock.c:3611
       smc_listen_out+0x113/0x3e0 net/smc/af_smc.c:1905
       process_one_work kernel/workqueue.c:3229 [inline]
       process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
       worker_thread+0x870/0xd30 kernel/workqueue.c:3391
       kthread+0x2f0/0x390 kernel/kthread.c:389
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
       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:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
       __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
       touch_work_lockdep_map kernel/workqueue.c:3895 [inline]
       start_flush_work kernel/workqueue.c:4149 [inline]
       __flush_work+0x74e/0xc50 kernel/workqueue.c:4181
       __cancel_work_sync+0xbc/0x110 kernel/workqueue.c:4337
       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:1837
       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:658 [inline]
       sock_close+0xbc/0x240 net/socket.c:1426
       __fput+0x23f/0x880 fs/file_table.c:431
       __do_sys_close fs/open.c:1565 [inline]
       __se_sys_close fs/open.c:1550 [inline]
       __x64_sys_close+0x7f/0x110 fs/open.c:1550
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       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-executor.0/28763:
 #0: ffff8880685ae208 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline]
 #0: ffff8880685ae208 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release net/socket.c:657 [inline]
 #0: ffff8880685ae208 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: sock_close+0x90/0x240 net/socket.c:1426
 #1: ffff88802fd0bbd8 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x234/0x540
 #2: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #2: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #2: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: start_flush_work kernel/workqueue.c:4123 [inline]
 #2: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: __flush_work+0xe7/0xc50 kernel/workqueue.c:4181

stack backtrace:
CPU: 1 UID: 0 PID: 28763 Comm: syz-executor.0 Not tainted 6.12.0-rc3-syzkaller-gc964ced77262 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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:2074
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
 check_prev_add kernel/locking/lockdep.c:3161 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
 touch_work_lockdep_map kernel/workqueue.c:3895 [inline]
 start_flush_work kernel/workqueue.c:4149 [inline]
 __flush_work+0x74e/0xc50 kernel/workqueue.c:4181
 __cancel_work_sync+0xbc/0x110 kernel/workqueue.c:4337
 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:1837
 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:658 [inline]
 sock_close+0xbc/0x240 net/socket.c:1426
 __fput+0x23f/0x880 fs/file_table.c:431
 __do_sys_close fs/open.c:1565 [inline]
 __se_sys_close fs/open.c:1550 [inline]
 __x64_sys_close+0x7f/0x110 fs/open.c:1550
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc76a47bc9a
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:00007ffc15a2feb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007fc76a47bc9a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 0000000000000032 R08: 0000001b2de60000 R09: 00007fc76a5abf8c
R10: 00007ffc15a30000 R11: 0000000000000293 R12: 00007fc76a0003f8
R13: ffffffffffffffff R14: 00007fc76a000000 R15: 0000000000042565
 </TASK>