syzbot

netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
======================================================
WARNING: possible circular locking dependency detected
5.15.182-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor149/4025 is trying to acquire lock:
ffff0000c8451450 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: __flush_work+0xcc/0x1bc kernel/workqueue.c:3087

but task is already holding lock:
ffff0000c8450120 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x1f4/0x568 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+0xd8/0x1d4 net/core/sock.c:3251
       smc_listen_out+0x11c/0x3e8 net/smc/af_smc.c:1524
       smc_listen_out_connected net/smc/af_smc.c:1544 [inline]
       smc_listen_work+0x1d0/0xd2c net/smc/af_smc.c:-1
       process_one_work+0x79c/0x1140 kernel/workqueue.c:2310
       worker_thread+0x8f4/0x101c kernel/workqueue.c:2457
       kthread+0x374/0x454 kernel/kthread.c:334
       ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870

-> #0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3053 [inline]
       check_prevs_add kernel/locking/lockdep.c:3172 [inline]
       validate_chain kernel/locking/lockdep.c:3788 [inline]
       __lock_acquire+0x2928/0x651c kernel/locking/lockdep.c:5012
       lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623
       __flush_work+0xf4/0x1bc kernel/workqueue.c:3090
       __cancel_work_timer+0x2ec/0x448 kernel/workqueue.c:3181
       cancel_work_sync+0x24/0x38 kernel/workqueue.c:3217
       smc_clcsock_release+0x64/0xe8 net/smc/smc_close.c:29
       __smc_release+0x3bc/0x530 net/smc/af_smc.c:211
       smc_close_non_accepted+0xdc/0x298 net/smc/af_smc.c:1466
       smc_close_cleanup_listen net/smc/smc_close.c:45 [inline]
       smc_close_active+0x890/0xc20 net/smc/smc_close.c:219
       __smc_release+0x2dc/0x530 net/smc/af_smc.c:187
       smc_release+0x264/0x568 net/smc/af_smc.c:254
       __sock_release net/socket.c:649 [inline]
       sock_close+0xb4/0x1f8 net/socket.c:1336
       __fput+0x1c0/0x7f8 fs/file_table.c:311
       ____fput+0x20/0x30 fs/file_table.c:339
       task_work_run+0x12c/0x1e0 kernel/task_work.c:188
       exit_task_work include/linux/task_work.h:33 [inline]
       do_exit+0x67c/0x1f58 kernel/exit.c:874
       do_group_exit+0x100/0x268 kernel/exit.c:996
       __do_sys_exit_group kernel/exit.c:1007 [inline]
       __se_sys_exit_group kernel/exit.c:1005 [inline]
       __wake_up_parent+0x0/0x60 kernel/exit.c:1005
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
       do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
       el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
       el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
       el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

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-executor149/4025:
 #0: ffff0000e209d010 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
 #0: ffff0000e209d010 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: __sock_release net/socket.c:648 [inline]
 #0: ffff0000e209d010 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: sock_close+0x7c/0x1f8 net/socket.c:1336
 #1: ffff0000c8450120 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x1f4/0x568 net/smc/af_smc.c:-1

stack backtrace:
CPU: 0 PID: 4025 Comm: syz-executor149 Not tainted 5.15.182-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2011
 check_noncircular+0x240/0x2d4 kernel/locking/lockdep.c:2133
 check_prev_add kernel/locking/lockdep.c:3053 [inline]
 check_prevs_add kernel/locking/lockdep.c:3172 [inline]
 validate_chain kernel/locking/lockdep.c:3788 [inline]
 __lock_acquire+0x2928/0x651c kernel/locking/lockdep.c:5012
 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623
 __flush_work+0xf4/0x1bc kernel/workqueue.c:3090
 __cancel_work_timer+0x2ec/0x448 kernel/workqueue.c:3181
 cancel_work_sync+0x24/0x38 kernel/workqueue.c:3217
 smc_clcsock_release+0x64/0xe8 net/smc/smc_close.c:29
 __smc_release+0x3bc/0x530 net/smc/af_smc.c:211
 smc_close_non_accepted+0xdc/0x298 net/smc/af_smc.c:1466
 smc_close_cleanup_listen net/smc/smc_close.c:45 [inline]
 smc_close_active+0x890/0xc20 net/smc/smc_close.c:219
 __smc_release+0x2dc/0x530 net/smc/af_smc.c:187
 smc_release+0x264/0x568 net/smc/af_smc.c:254
 __sock_release net/socket.c:649 [inline]
 sock_close+0xb4/0x1f8 net/socket.c:1336
 __fput+0x1c0/0x7f8 fs/file_table.c:311
 ____fput+0x20/0x30 fs/file_table.c:339
 task_work_run+0x12c/0x1e0 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0x67c/0x1f58 kernel/exit.c:874
 do_group_exit+0x100/0x268 kernel/exit.c:996
 __do_sys_exit_group kernel/exit.c:1007 [inline]
 __se_sys_exit_group kernel/exit.c:1005 [inline]
 __wake_up_parent+0x0/0x60 kernel/exit.c:1005
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584