[  OK  ] Reached target Login Prompts.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.143' (ECDSA) to the list of known hosts.
executing program
executing program
executing program
executing program
executing program
syzkaller login: [  224.791442][   T26] audit: type=1400 audit(1599936382.104:8): avc:  denied  { execmem } for  pid=6848 comm="syz-executor117" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
executing program
[  239.374437][ T7382] ------------[ cut here ]------------
[  239.397947][ T7382] refcount_t: underflow; use-after-free.
[  239.430545][ T7382] WARNING: CPU: 0 PID: 7382 at lib/refcount.c:28 refcount_warn_saturate+0x1d1/0x1e0
[  239.476214][ T7382] Kernel panic - not syncing: panic_on_warn set ...
[  239.482838][ T7382] CPU: 0 PID: 7382 Comm: io_wqe_worker-1 Not tainted 5.9.0-rc4-syzkaller #0
[  239.491506][ T7382] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  239.501555][ T7382] Call Trace:
[  239.504857][ T7382]  dump_stack+0x198/0x1fd
[  239.509193][ T7382]  panic+0x347/0x7c0
[  239.513091][ T7382]  ? __warn_printk+0xf3/0xf3
[  239.518474][ T7382]  ? __warn.cold+0x5/0x46
[  239.522801][ T7382]  ? __warn+0xd6/0x1f2
[  239.527134][ T7382]  ? refcount_warn_saturate+0x1d1/0x1e0
[  239.532680][ T7382]  __warn.cold+0x20/0x46
[  239.536920][ T7382]  ? wake_up_klogd.part.0+0x8c/0xc0
[  239.542119][ T7382]  ? refcount_warn_saturate+0x1d1/0x1e0
[  239.547683][ T7382]  report_bug+0x1bd/0x210
[  239.552092][ T7382]  handle_bug+0x38/0x90
[  239.556273][ T7382]  exc_invalid_op+0x14/0x40
[  239.560809][ T7382]  asm_exc_invalid_op+0x12/0x20
[  239.565667][ T7382] RIP: 0010:refcount_warn_saturate+0x1d1/0x1e0
[  239.571839][ T7382] Code: e9 db fe ff ff 48 89 df e8 2c dd 18 fe e9 8a fe ff ff e8 c2 d6 d8 fd 48 c7 c7 60 dc 93 88 c6 05 0d 0d 12 07 01 e8 b1 d7 a9 fd <0f> 0b e9 af fe ff ff 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 55
[  239.591443][ T7382] RSP: 0018:ffffc9000810fe08 EFLAGS: 00010286
[  239.597507][ T7382] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  239.605477][ T7382] RDX: ffff88809592a200 RSI: ffffffff815db9a7 RDI: fffff52001021fb3
[  239.613444][ T7382] RBP: 0000000000000003 R08: 0000000000000001 R09: ffff8880ae6318e7
[  239.621425][ T7382] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809a6080b8
[  239.629395][ T7382] R13: ffff8880a7896e30 R14: ffff8880a7896e00 R15: ffff8880a6727f00
[  239.637384][ T7382]  ? vprintk_func+0x97/0x1a6
[  239.642005][ T7382]  ? refcount_warn_saturate+0x1d1/0x1e0
[  239.647568][ T7382]  io_wqe_worker+0xcdb/0x10e0
[  239.652253][ T7382]  ? lockdep_hardirqs_on_prepare+0x354/0x530
[  239.658235][ T7382]  ? io_worker_handle_work+0x13f0/0x13f0
[  239.663872][ T7382]  ? lockdep_hardirqs_on+0x53/0x100
[  239.669074][ T7382]  ? __kthread_parkme+0x13f/0x1e0
[  239.674097][ T7382]  ? io_worker_handle_work+0x13f0/0x13f0
[  239.679738][ T7382]  kthread+0x3b5/0x4a0
[  239.683808][ T7382]  ? __kthread_bind_mask+0xc0/0xc0
[  239.689707][ T7382]  ret_from_fork+0x1f/0x30
[  239.695271][ T7382] Kernel Offset: disabled
[  239.699634][ T7382] Rebooting in 86400 seconds..