====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.2.3071/17280 is trying to acquire lock: ffff88807a861f98 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] ffff88807a861f98 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] ffff88807a861f98 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: start_flush_work kernel/workqueue.c:3412 [inline] ffff88807a861f98 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}, at: __flush_work+0x118/0xaa0 kernel/workqueue.c:3470 but task is already holding lock: ffff88807a860c70 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x255/0x530 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+0x48/0x100 net/core/sock.c:3535 smc_listen_out+0x109/0x3d0 net/smc/af_smc.c:1922 smc_listen_out_connected net/smc/af_smc.c:1942 [inline] smc_listen_decline net/smc/af_smc.c:1977 [inline] smc_listen_work+0x581/0xf40 net/smc/af_smc.c:2574 process_one_work kernel/workqueue.c:2653 [inline] process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 -> #0 ((work_completion)(&new_smc->smc_listen_work)){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2df1/0x7d40 kernel/locking/lockdep.c:5137 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 touch_work_lockdep_map kernel/workqueue.c:3186 [inline] start_flush_work kernel/workqueue.c:3438 [inline] __flush_work+0x64e/0xaa0 kernel/workqueue.c:3470 __cancel_work_timer+0x3f8/0x560 kernel/workqueue.c:3558 smc_clcsock_release+0x60/0xf0 net/smc/smc_close.c:29 __smc_release+0x661/0x7d0 net/smc/af_smc.c:311 smc_close_non_accepted+0xd5/0x1f0 net/smc/af_smc.c:1853 smc_close_cleanup_listen net/smc/smc_close.c:45 [inline] smc_close_active+0xb61/0xf00 net/smc/smc_close.c:225 __smc_release+0x8d/0x7d0 net/smc/af_smc.c:287 smc_release+0x2ce/0x530 net/smc/af_smc.c:354 __sock_release net/socket.c:659 [inline] sock_close+0xbd/0x230 net/socket.c:1420 __fput+0x234/0x970 fs/file_table.c:384 __do_sys_close fs/open.c:1573 [inline] __se_sys_close+0x15f/0x220 fs/open.c:1558 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 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 *** 3 locks held by syz.2.3071/17280: #0: ffff88805e189420 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #0: ffff88805e189420 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: __sock_release net/socket.c:658 [inline] #0: ffff88805e189420 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: sock_close+0x9b/0x230 net/socket.c:1420 #1: ffff88807a860c70 (sk_lock-AF_SMC/1){+.+.}-{0:0}, at: smc_release+0x255/0x530 net/smc/af_smc.c:-1 #2: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #2: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #2: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: start_flush_work kernel/workqueue.c:3412 [inline] #2: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: __flush_work+0x118/0xaa0 kernel/workqueue.c:3470 stack backtrace: CPU: 0 PID: 17280 Comm: syz.2.3071 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 check_noncircular+0x2fc/0x400 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2df1/0x7d40 kernel/locking/lockdep.c:5137 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 touch_work_lockdep_map kernel/workqueue.c:3186 [inline] start_flush_work kernel/workqueue.c:3438 [inline] __flush_work+0x64e/0xaa0 kernel/workqueue.c:3470 __cancel_work_timer+0x3f8/0x560 kernel/workqueue.c:3558 smc_clcsock_release+0x60/0xf0 net/smc/smc_close.c:29 __smc_release+0x661/0x7d0 net/smc/af_smc.c:311 smc_close_non_accepted+0xd5/0x1f0 net/smc/af_smc.c:1853 smc_close_cleanup_listen net/smc/smc_close.c:45 [inline] smc_close_active+0xb61/0xf00 net/smc/smc_close.c:225 __smc_release+0x8d/0x7d0 net/smc/af_smc.c:287 smc_release+0x2ce/0x530 net/smc/af_smc.c:354 __sock_release net/socket.c:659 [inline] sock_close+0xbd/0x230 net/socket.c:1420 __fput+0x234/0x970 fs/file_table.c:384 __do_sys_close fs/open.c:1573 [inline] __se_sys_close+0x15f/0x220 fs/open.c:1558 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fb4c2f9ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb4c3e66028 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 00007fb4c3215fa0 RCX: 00007fb4c2f9ce59 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007fb4c3032d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb4c3216038 R14: 00007fb4c3215fa0 R15: 00007ffe7e105a98