[[0;32m OK [0m] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch.
[[0;32m OK [0m] Started Getty on tty6.
[[0;32m OK [0m] Started Getty on tty5.
[[0;32m OK [0m] Reached target Login Prompts.
[[0;32m OK [0m] Reached target Multi-User System.
[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
Starting Load/Save RF Kill Switch Status...
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
[[0;32m OK [0m] Started Load/Save RF Kill Switch Status.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.254' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 27.593573]
[ 27.595206] ======================================================
[ 27.601495] WARNING: possible circular locking dependency detected
[ 27.607789] 4.14.289-syzkaller #0 Not tainted
[ 27.612254] ------------------------------------------------------
[ 27.618545] kworker/u4:1/23 is trying to acquire lock:
[ 27.623790] (sk_lock-AF_INET6){+.+.}, at: [<ffffffff8681e12e>] strp_work+0x3e/0x100
[ 27.631651]
[ 27.631651] but task is already holding lock:
[ 27.637591] ((&strp->work)){+.+.}, at: [<ffffffff81364ee6>] process_one_work+0x6e6/0x14a0
[ 27.645971]
[ 27.645971] which lock already depends on the new lock.
[ 27.645971]
[ 27.654255]
[ 27.654255] the existing dependency chain (in reverse order) is:
[ 27.661866]
[ 27.661866] -> #1 ((&strp->work)){+.+.}:
[ 27.667388] flush_work+0xad/0x770
[ 27.671422] __cancel_work_timer+0x321/0x460
[ 27.676322] strp_done+0x53/0xd0
[ 27.680200] kcm_ioctl+0x828/0xfb0
[ 27.684234] sock_ioctl+0x2cc/0x4c0
[ 27.688358] do_vfs_ioctl+0x75a/0xff0
[ 27.692659] SyS_ioctl+0x7f/0xb0
[ 27.696519] do_syscall_64+0x1d5/0x640
[ 27.700901] entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 27.706579]
[ 27.706579] -> #0 (sk_lock-AF_INET6){+.+.}:
[ 27.712356] lock_acquire+0x170/0x3f0
[ 27.716666] lock_sock_nested+0xb7/0x100
[ 27.721221] strp_work+0x3e/0x100
[ 27.725193] process_one_work+0x793/0x14a0
[ 27.729940] worker_thread+0x5cc/0xff0
[ 27.734319] kthread+0x30d/0x420
[ 27.738195] ret_from_fork+0x24/0x30
[ 27.742398]
[ 27.742398] other info that might help us debug this:
[ 27.742398]
[ 27.750511] Possible unsafe locking scenario:
[ 27.750511]
[ 27.756539] CPU0 CPU1
[ 27.761179] ---- ----
[ 27.765816] lock((&strp->work));
[ 27.769327] lock(sk_lock-AF_INET6);
[ 27.775639] lock((&strp->work));
[ 27.781669] lock(sk_lock-AF_INET6);
[ 27.785457]
[ 27.785457] *** DEADLOCK ***
[ 27.785457]
[ 27.791488] 2 locks held by kworker/u4:1/23:
[ 27.795866] #0: ("%s""kstrp"){+.+.}, at: [<ffffffff81364eb0>] process_one_work+0x6b0/0x14a0
[ 27.804533] #1: ((&strp->work)){+.+.}, at: [<ffffffff81364ee6>] process_one_work+0x6e6/0x14a0
[ 27.813346]
[ 27.813346] stack backtrace:
[ 27.817840] CPU: 0 PID: 23 Comm: kworker/u4:1 Not tainted 4.14.289-syzkaller #0
[ 27.825272] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
[ 27.834608] Workqueue: kstrp strp_work
[ 27.838469] Call Trace:
[ 27.841038] dump_stack+0x1b2/0x281
[ 27.845074] print_circular_bug.constprop.0.cold+0x2d7/0x41e
[ 27.850845] __lock_acquire+0x2e0e/0x3f20
[ 27.854977] ? __schedule+0x893/0x1de0
[ 27.858838] ? trace_hardirqs_on+0x10/0x10
[ 27.863045] ? lock_acquire+0x170/0x3f0
[ 27.866996] ? lock_sock_nested+0x98/0x100
[ 27.871204] lock_acquire+0x170/0x3f0
[ 27.875065] ? strp_work+0x3e/0x100
[ 27.878691] lock_sock_nested+0xb7/0x100
[ 27.882732] ? strp_work+0x3e/0x100
[ 27.886348] strp_work+0x3e/0x100
[ 27.889778] process_one_work+0x793/0x14a0
[ 27.894