[ 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. 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 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. 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 [ 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 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 executing program executing program executing program executing program executing program executing program executing program [ 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..