[[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 '10.128.0.252' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 31.879075]
[ 31.880707] ======================================================
[ 31.886995] WARNING: possible circular locking dependency detected
[ 31.893316] 4.14.289-syzkaller #0 Not tainted
[ 31.897777] ------------------------------------------------------
[ 31.904068] kworker/u4:1/23 is trying to acquire lock:
[ 31.909327] (sk_lock-AF_INET6){+.+.}, at: [<ffffffff8681e12e>] strp_work+0x3e/0x100
[ 31.917208]
[ 31.917208] but task is already holding lock:
[ 31.923149] ((&strp->work)){+.+.}, at: [<ffffffff81364ee6>] process_one_work+0x6e6/0x14a0
[ 31.931537]
[ 31.931537] which lock already depends on the new lock.
[ 31.931537]
[ 31.939906]
[ 31.939906] the existing dependency chain (in reverse order) is:
[ 31.947523]
[ 31.947523] -> #1 ((&strp->work)){+.+.}:
[ 31.953038] flush_work+0xad/0x770
[ 31.957070] __cancel_work_timer+0x321/0x460
[ 31.961968] strp_done+0x53/0xd0
[ 31.965826] kcm_ioctl+0x828/0xfb0
[ 31.969860] sock_ioctl+0x2cc/0x4c0
[ 31.973977] do_vfs_ioctl+0x75a/0xff0
[ 31.978272] SyS_ioctl+0x7f/0xb0
[ 31.982146] do_syscall_64+0x1d5/0x640
[ 31.986524] entry_SYSCALL_64_after_hwframe+0x46/0xbb
[ 31.992203]
[ 31.992203] -> #0 (sk_lock-AF_INET6){+.+.}:
[ 31.997977] lock_acquire+0x170/0x3f0
[ 32.002271] lock_sock_nested+0xb7/0x100
[ 32.006823] strp_work+0x3e/0x100
[ 32.010769] process_one_work+0x793/0x14a0
[ 32.015494] worker_thread+0x5cc/0xff0
[ 32.019871] kthread+0x30d/0x420
[ 32.023734] ret_from_fork+0x24/0x30
[ 32.027949]
[ 32.027949] other info that might help us debug this:
[ 32.027949]
[ 32.036059] Possible unsafe locking scenario:
[ 32.036059]
[ 32.042084] CPU0 CPU1
[ 32.046718] ---- ----
[ 32.051367] lock((&strp->work));
[ 32.054891] lock(sk_lock-AF_INET6);
[ 32.061179] lock((&strp->work));
[ 32.067205] lock(sk_lock-AF_INET6);
[ 32.070974]
[ 32.070974] *** DEADLOCK ***
[ 32.070974]
[ 32.077003] 2 locks held by kworker/u4:1/23:
[ 32.081378] #0: ("%s""kstrp"){+.+.}, at: [<ffffffff81364eb0>] process_one_work+0x6b0/0x14a0
[ 32.090018] #1: ((&strp->work)){+.+.}, at: [<ffffffff81364ee6>] process_one_work+0x6e6/0x14a0
[ 32.098834]
[ 32.098834] stack backtrace:
[ 32.103303] CPU: 1 PID: 23 Comm: kworker/u4:1 Not tainted 4.14.289-syzkaller #0
[ 32.110715] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
[ 32.120048] Workqueue: kstrp strp_work
[ 32.123909] Call Trace:
[ 32.126488] dump_stack+0x1b2/0x281
[ 32.130088] print_circular_bug.constprop.0.cold+0x2d7/0x41e
[ 32.135878] __lock_acquire+0x2e0e/0x3f20
[ 32.140000] ? __schedule+0x893/0x1de0
[ 32.143856] ? trace_hardirqs_on+0x10/0x10
[ 32.148061] ? lock_acquire+0x170/0x3f0
[ 32.152015] ? lock_sock_nested+0x98/0x100
[ 32.156223] lock_acquire+0x170/0x3f0
[ 32.159993] ? strp_work+0x3e/0x100
[ 32.163607] lock_sock_nested+0xb7/0x100
[ 32.167650] ? strp_work+0x3e/0x100
[ 32.171255] strp_work+0x3e/0x100
[ 32.174679] process_one_work+0x793/0x14a0
[ 32.178883] ?