[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Update UTMP about System Runlevel Changes.
[  OK  ] Started Load/Save RF Kill Switch Status.


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.1.18' (ECDSA) to the list of known hosts.
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syzkaller login: [  520.179416][   T27] audit: type=1400 audit(1596400938.782:8): avc:  denied  { execmem } for  pid=6840 comm="syz-executor266" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
[  520.206744][ T3853] ------------[ cut here ]------------
[  520.213310][ T3853] refcount_t: underflow; use-after-free.
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[  520.240276][ T3853] WARNING: CPU: 0 PID: 3853 at lib/refcount.c:28 refcount_warn_saturate+0x1d1/0x1e0
[  520.270142][ T3853] Kernel panic - not syncing: panic_on_warn set ...
[  520.276943][ T3853] CPU: 0 PID: 3853 Comm: kworker/0:8 Not tainted 5.8.0-rc7-syzkaller #0
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[  520.285261][ T3853] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  520.295560][ T3853] Workqueue: events do_enable_set
[  520.300588][ T3853] Call Trace:
[  520.303936][ T3853]  dump_stack+0x18f/0x20d
[  520.308347][ T3853]  panic+0x2e3/0x75c
[  520.312252][ T3853]  ? __warn_printk+0xf3/0xf3
[  520.316885][ T3853]  ? __warn.cold+0x5/0x45
[  520.321306][ T3853]  ? __warn+0xd6/0x1f2
[  520.325470][ T3853]  ? refcount_warn_saturate+0x1d1/0x1e0
[  520.331022][ T3853]  __warn.cold+0x20/0x45
[  520.335295][ T3853]  ? refcount_warn_saturate+0x1d1/0x1e0
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[  520.340851][ T3853]  report_bug+0x1bd/0x210
[  520.345280][ T3853]  handle_bug+0x38/0x90
[  520.349449][ T3853]  ? __warn_printk+0xc6/0xf3
[  520.354139][ T3853]  exc_invalid_op+0x13/0x40
[  520.358968][ T3853]  asm_exc_invalid_op+0x12/0x20
[  520.363856][ T3853] RIP: 0010:refcount_warn_saturate+0x1d1/0x1e0
[  520.370101][ T3853] Code: e9 db fe ff ff 48 89 df e8 0c 7e 1b fe e9 8a fe ff ff e8 f2 17 dc fd 48 c7 c7 40 54 93 88 c6 05 fb a4 12 07 01 e8 91 55 ad fd <0f> 0b e9 af fe ff ff 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 55
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[  520.390154][ T3853] RSP: 0018:ffffc90001b97bd0 EFLAGS: 00010282
[  520.396487][ T3853] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  520.404461][ T3853] RDX: ffff88809905e380 RSI: ffffffff815d4ef7 RDI: fffff52000372f6c
[  520.412432][ T3853] RBP: 0000000000000003 R08: 0000000000000001 R09: ffff8880ae6318e7
[  520.420414][ T3853] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809eaad018
[  520.428424][ T3853] R13: ffff888098071390 R14: ffff8880a19b1c00 R15: ffff888098071380
[  520.436486][ T3853]  ? vprintk_func+0x97/0x1a6
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[  520.441154][ T3853]  l2cap_chan_put+0x1d3/0x230
[  520.445844][ T3853]  do_enable_set+0x4f9/0x980
[  520.450448][ T3853]  ? chan_recv_cb+0xa10/0xa10
[  520.455314][ T3853]  ? _raw_spin_unlock_irq+0x1f/0x80
[  520.460548][ T3853]  ? _raw_spin_unlock_irq+0x1f/0x80
[  520.465785][ T3853]  ? lock_is_held_type+0xb0/0xe0
[  520.470822][ T3853]  process_one_work+0x94c/0x1670
[  520.475856][ T3853]  ? lock_release+0x8d0/0x8d0
[  520.480544][ T3853]  ? pwq_dec_nr_in_flight+0x2d0/0x2d0
[  520.485927][ T3853]  ? rwlock_bug.part.0+0x90/0x90
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[  520.490881][ T3853]  ? lockdep_hardirqs_off+0x66/0xa0
[  520.496091][ T3853]  worker_thread+0x64c/0x1120
[  520.500801][ T3853]  ? process_one_work+0x1670/0x1670
[  520.506010][ T3853]  kthread+0x3b5/0x4a0
[  520.510224][ T3853]  ? __kthread_bind_mask+0xc0/0xc0
[  520.515350][ T3853]  ? __kthread_bind_mask+0xc0/0xc0
[  520.520555][ T3853]  ret_from_fork+0x1f/0x30
[  520.526150][ T3853] Kernel Offset: disabled
[  520.530528][ T3853] Rebooting in 86400 seconds..