Warning: Permanently added '10.128.1.52' (ECDSA) to the list of known hosts.
executing program
[   29.835835] 
[   29.837472] ======================================================
[   29.843763] WARNING: possible circular locking dependency detected
[   29.850052] 4.14.288-syzkaller #0 Not tainted
[   29.854529] ------------------------------------------------------
[   29.860829] kworker/u4:0/5 is trying to acquire lock:
[   29.865987]  (sk_lock-AF_INET6){+.+.}, at: [<ffffffff8681dfbe>] strp_work+0x3e/0x100
[   29.873851] 
[   29.873851] but task is already holding lock:
[   29.879886]  ((&strp->work)){+.+.}, at: [<ffffffff81364f26>] process_one_work+0x6e6/0x14a0
[   29.888269] 
[   29.888269] which lock already depends on the new lock.
[   29.888269] 
[   29.896557] 
[   29.896557] the existing dependency chain (in reverse order) is:
[   29.904149] 
[   29.904149] -> #1 ((&strp->work)){+.+.}:
[   29.909669]        flush_work+0xad/0x770
[   29.913760]        __cancel_work_timer+0x321/0x460
[   29.918663]        strp_done+0x53/0xd0
[   29.922520]        kcm_ioctl+0x828/0xfb0
[   29.926555]        sock_ioctl+0x2cc/0x4c0
[   29.930675]        do_vfs_ioctl+0x75a/0xff0
[   29.934974]        SyS_ioctl+0x7f/0xb0
[   29.938831]        do_syscall_64+0x1d5/0x640
[   29.943216]        entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   29.948897] 
[   29.948897] -> #0 (sk_lock-AF_INET6){+.+.}:
[   29.954675]        lock_acquire+0x170/0x3f0
[   29.958975]        lock_sock_nested+0xb7/0x100
[   29.963547]        strp_work+0x3e/0x100
[   29.967495]        process_one_work+0x793/0x14a0
[   29.974307]        worker_thread+0x5cc/0xff0
[   29.978699]        kthread+0x30d/0x420
[   29.982560]        ret_from_fork+0x24/0x30
[   29.986762] 
[   29.986762] other info that might help us debug this:
[   29.986762] 
[   29.994877]  Possible unsafe locking scenario:
[   29.994877] 
[   30.000906]        CPU0                    CPU1
[   30.005571]        ----                    ----
[   30.010211]   lock((&strp->work));
[   30.013725]                                lock(sk_lock-AF_INET6);
[   30.020017]                                lock((&strp->work));
[   30.026055]   lock(sk_lock-AF_INET6);
[   30.029828] 
[   30.029828]  *** DEADLOCK ***
[   30.029828] 
[   30.035858] 2 locks held by kworker/u4:0/5:
[   30.040159]  #0:  ("%s""kstrp"){+.+.}, at: [<ffffffff81364ef0>] process_one_work+0x6b0/0x14a0
[   30.048802]  #1:  ((&strp->work)){+.+.}, at: [<ffffffff81364f26>] process_one_work+0x6e6/0x14a0
[   30.057622] 
[   30.057622] stack backtrace:
[   30.062096] CPU: 1 PID: 5 Comm: kworker/u4:0 Not tainted 4.14.288-syzkaller #0
[   30.069428] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
[   30.078762] Workqueue: kstrp strp_work
[   30.082621] Call Trace:
[   30.085183]  dump_stack+0x1b2/0x281
[   30.088788]  print_circular_bug.constprop.0.cold+0x2d7/0x41e
[   30.094564]  __lock_acquire+0x2e0e/0x3f20
[   30.098690]  ? __schedule+0x893/0x1de0
[   30.102552]  ? trace_hardirqs_on+0x10/0x10
[   30.106774]  ? lock_acquire+0x170/0x3f0
[   30.110722]  ? lock_sock_nested+0x98/0x100
[   30.114933]  lock_acquire+0x170/0x3f0
[   30.118707]  ? strp_work+0x3e/0x100
[   30.122308]  lock_sock_nested+0xb7/0x100
[   30.126346]  ? strp_work+0x3e/0x100
[   30.129950]  strp_work+0x3e/0x100
[   30.133382]  process_one_work+0x793/0x14