Warning: Permanently added '10.128.0.179' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   26.987525] 
[   26.989160] ======================================================
[   26.995448] WARNING: possible circular locking dependency detected
[   27.001735] 4.14.288-syzkaller #0 Not tainted
[   27.006196] ------------------------------------------------------
[   27.012487] kworker/u4:3/239 is trying to acquire lock:
[   27.017815]  (sk_lock-AF_INET6){+.+.}, at: [<ffffffff8681dfbe>] strp_work+0x3e/0x100
[   27.025676] 
[   27.025676] but task is already holding lock:
[   27.031616]  ((&strp->work)){+.+.}, at: [<ffffffff81364f26>] process_one_work+0x6e6/0x14a0
[   27.039999] 
[   27.039999] which lock already depends on the new lock.
[   27.039999] 
[   27.048289] 
[   27.048289] the existing dependency chain (in reverse order) is:
[   27.055890] 
[   27.055890] -> #1 ((&strp->work)){+.+.}:
[   27.061418]        flush_work+0xad/0x770
[   27.065463]        __cancel_work_timer+0x321/0x460
[   27.070379]        strp_done+0x53/0xd0
[   27.074242]        kcm_ioctl+0x828/0xfb0
[   27.078280]        sock_ioctl+0x2cc/0x4c0
[   27.082403]        do_vfs_ioctl+0x75a/0xff0
[   27.086698]        SyS_ioctl+0x7f/0xb0
[   27.090572]        do_syscall_64+0x1d5/0x640
[   27.094955]        entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   27.100632] 
[   27.100632] -> #0 (sk_lock-AF_INET6){+.+.}:
[   27.106423]        lock_acquire+0x170/0x3f0
[   27.110717]        lock_sock_nested+0xb7/0x100
[   27.115271]        strp_work+0x3e/0x100
[   27.119216]        process_one_work+0x793/0x14a0
[   27.124030]        worker_thread+0x5cc/0xff0
[   27.128408]        kthread+0x30d/0x420
[   27.132268]        ret_from_fork+0x24/0x30
[   27.136472] 
[   27.136472] other info that might help us debug this:
[   27.136472] 
[   27.144585]  Possible unsafe locking scenario:
[   27.144585] 
[   27.150623]        CPU0                    CPU1
[   27.155279]        ----                    ----
[   27.159919]   lock((&strp->work));
[   27.163432]                                lock(sk_lock-AF_INET6);
[   27.169722]                                lock((&strp->work));
[   27.175755]   lock(sk_lock-AF_INET6);
[   27.179528] 
[   27.179528]  *** DEADLOCK ***
[   27.179528] 
[   27.185559] 2 locks held by kworker/u4:3/239:
[   27.190019]  #0:  ("%s""kstrp"){+.+.}, at: [<ffffffff81364ef0>] process_one_work+0x6b0/0x14a0
[   27.198662]  #1:  ((&strp->work)){+.+.}, at: [<ffffffff81364f26>] process_one_work+0x6e6/0x14a0
[   27.207475] 
[   27.207475] stack backtrace:
[   27.211942] CPU: 1 PID: 239 Comm: kworker/u4:3 Not tainted 4.14.288-syzkaller #0
[   27.219448] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
[   27.228786] Workqueue: kstrp strp_work
[   27.232645] Call Trace:
[   27.235223]  dump_stack+0x1b2/0x281
[   27.238827]  print_circular_bug.constprop.0.cold+0x2d7/0x41e
[   27.244600]  __lock_acquire+0x2e0e/0x3f20
[   27.248737]  ? __schedule+0x893/0x1de0
[   27.252607]  ? trace_hardirqs_on+0x10/0x10
[   27.256810]  ? lock_acquire+0x170/0x3f0
[   27.260756]  ? lock_sock_nested+0x98/0x100
[   27.264962]  lock_acquire+0x170/0x3f0
[   27.268738]  ? strp_work+0x3e/0x100
[   27.272335]  lock_sock_nested+0xb7/0x100
[   27.276368]  ? strp_work+0x3e/0x100
[   27.279965]  strp_work+0x3e/0x100
[   27.283392]  process_one_work+0x793/0x14a0
[   27.287606]