[  OK  ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
         Starting Load/Save RF Kill Switch Status...


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.136' (ECDSA) to the list of known hosts.
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syzkaller login: [   46.963225][ T6832] IPVS: ftp: loaded support on port[0] = 21
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[   47.388112][ T4133] ------------[ cut here ]------------
[   47.393803][ T4133] refcount_t: addition on 0; use-after-free.
[   47.400004][ T4133] WARNING: CPU: 1 PID: 4133 at lib/refcount.c:25 refcount_warn_saturate+0x13d/0x1a0
[   47.409353][ T4133] Kernel panic - not syncing: panic_on_warn set ...
[   47.415926][ T4133] CPU: 1 PID: 4133 Comm: kworker/u4:8 Not tainted 5.9.0-rc6-syzkaller #0
[   47.424705][ T4133] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.434938][ T4133] Workqueue: qrtr_ns_handler qrtr_ns_worker
[   47.440814][ T4133] Call Trace:
[   47.444171][ T4133]  dump_stack+0x1d6/0x29e
[   47.448482][ T4133]  panic+0x2c0/0x800
[   47.452367][ T4133]  ? __warn+0x102/0x250
[   47.456679][ T4133]  ? refcount_warn_saturate+0x13d/0x1a0
[   47.462216][ T4133]  ? refcount_warn_saturate+0x13d/0x1a0
[   47.467930][ T4133]  __warn+0x227/0x250
[   47.471893][ T4133]  ? refcount_warn_saturate+0x13d/0x1a0
[   47.477423][ T4133]  report_bug+0x1b1/0x2e0
[   47.481748][ T4133]  handle_bug+0x42/0x80
[   47.485891][ T4133]  exc_invalid_op+0x16/0x40
[   47.490472][ T4133]  asm_exc_invalid_op+0x12/0x20
[   47.495310][ T4133] RIP: 0010:refcount_warn_saturate+0x13d/0x1a0
[   47.501435][ T4133] Code: c7 03 f4 37 89 31 c0 e8 01 5f 88 fd 0f 0b eb a3 e8 c8 bf b6 fd c6 05 1a 33 ed 05 01 48 c7 c7 3a f4 37 89 31 c0 e8 e3 5e 88 fd <0f> 0b eb 85 e8 aa bf b6 fd c6 05 fd 32 ed 05 01 48 c7 c7 66 f4 37
[   47.521318][ T4133] RSP: 0018:ffffc900072f79c0 EFLAGS: 00010046
[   47.527364][ T4133] RAX: 1ceabb8756dc6c00 RBX: 0000000000000002 RCX: ffff8880a3208300
[   47.535360][ T4133] RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
[   47.543308][ T4133] RBP: 0000000000000002 R08: ffffffff815e37c0 R09: ffffed1015d241c3
[   47.551352][ T4133] R10: ffffed1015d241c3 R11: 0000000000000000 R12: ffff888096c23098
[   47.559300][ T4133] R13: 1ffff1101454b39e R14: 0000000000000282 R15: ffff888096c23000
[   47.567258][ T4133]  ? vprintk_emit+0x2f0/0x370
[   47.571915][ T4133]  qrtr_node_lookup+0xc0/0xd0
[   47.576571][ T4133]  qrtr_recvmsg+0x429/0xa80
[   47.581935][ T4133]  qrtr_ns_worker+0x176/0x45f0
[   47.586697][ T4133]  ? __lock_acquire+0x110b/0x2ae0
[   47.591728][ T4133]  ? lock_acquire+0x148/0x720
[   47.596392][ T4133]  ? process_one_work+0x733/0xfc0
[   47.601405][ T4133]  ? lock_is_held_type+0xb3/0xe0
[   47.606340][ T4133]  process_one_work+0x789/0xfc0
[   47.611177][ T4133]  worker_thread+0xaa4/0x1460
[   47.615869][ T4133]  kthread+0x37e/0x3a0
[   47.619925][ T4133]  ? rcu_lock_release+0x20/0x20
[   47.624799][ T4133]  ? kthread_blkcg+0xd0/0xd0
[   47.629396][ T4133]  ret_from_fork+0x1f/0x30
[   48.734102][ T4133] Shutting down cpus with NMI
[   48.740397][ T4133] Kernel Offset: disabled
[   48.744768][ T4133] Rebooting in 86400 seconds..