[ 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 '10.128.0.110' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 36.287427] audit: type=1400 audit(1589465981.402:8): avc: denied { execmem } for pid=6332 comm="syz-executor045" 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 [ 36.426389] Bluetooth: psm cannot be added err -98 executing program executing program executing program executing program executing program executing program executing program [ 36.496679] ================================================================== [ 36.504244] BUG: KASAN: use-after-free in l2cap_chan_close+0x4f6/0x770 [ 36.511026] Read of size 1 at addr ffff888097935360 by task kworker/1:2/2796 [ 36.518216] [ 36.519856] CPU: 1 PID: 2796 Comm: kworker/1:2 Not tainted 4.14.180-syzkaller #0 [ 36.527391] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.536760] Workqueue: events do_enable_set [ 36.541195] Call Trace: executing program executing program executing program executing program [ 36.543803] dump_stack+0x13e/0x194 [ 36.547435] ? l2cap_chan_close+0x4f6/0x770 [ 36.551846] print_address_description.cold+0x7c/0x1e2 [ 36.557139] ? l2cap_chan_close+0x4f6/0x770 [ 36.561468] kasan_report.cold+0xa9/0x2ae [ 36.565710] l2cap_chan_close+0x4f6/0x770 [ 36.569879] ? l2cap_retransmit.isra.0+0x240/0x240 [ 36.574823] ? lock_downgrade+0x6e0/0x6e0 [ 36.578979] do_enable_set+0x45a/0x7f0 [ 36.582870] ? __lock_is_held+0xad/0x140 [ 36.586937] ? lowpan_control_write+0x3f0/0x3f0 [ 36.591625] process_one_work+0x813/0x1540 executing program executing program executing program [ 36.595884] ? pwq_dec_nr_in_flight+0x2b0/0x2b0 [ 36.600557] ? worker_thread+0x15d/0x1070 [ 36.604751] ? _raw_spin_unlock_irq+0x24/0x80 [ 36.609250] worker_thread+0x5d1/0x1070 [ 36.613242] ? process_one_work+0x1540/0x1540 [ 36.617762] kthread+0x30d/0x420 [ 36.621220] ? kthread_create_on_node+0xd0/0xd0 [ 36.626066] ret_from_fork+0x24/0x30 [ 36.629794] [ 36.631425] Allocated by task 2796: [ 36.635052] save_stack+0x32/0xa0 [ 36.638524] kasan_kmalloc+0xbf/0xe0 [ 36.642251] kmem_cache_alloc_trace+0x14d/0x7b0 executing program executing program executing program executing program [ 36.646925] l2cap_chan_create+0x3e/0x3c0 [ 36.651084] chan_create+0xc/0xd0 [ 36.654538] do_enable_set+0x493/0x7f0 [ 36.658511] process_one_work+0x813/0x1540 [ 36.662744] worker_thread+0x5d1/0x1070 [ 36.666743] kthread+0x30d/0x420 [ 36.670116] ret_from_fork+0x24/0x30 [ 36.673826] [ 36.675446] Freed by task 25: [ 36.678557] save_stack+0x32/0xa0 [ 36.682006] kasan_slab_free+0x75/0xc0 [ 36.685956] kfree+0xcb/0x260 [ 36.689055] l2cap_chan_put+0x27/0x30 [ 36.692857] do_enable_set+0x466/0x7f0 executing program executing program executing program executing program [ 36.696747] process_one_work+0x813/0x1540 [ 36.701069] worker_thread+0x5d1/0x1070 [ 36.705045] kthread+0x30d/0x420 [ 36.708430] ret_from_fork+0x24/0x30 [ 36.712169] [ 36.713789] The buggy address belongs to the object at ffff888097935340 [ 36.713789] which belongs to the cache kmalloc-2048 of size 2048 [ 36.726714] The buggy address is located 32 bytes inside of [ 36.726714] 2048-byte region [ffff888097935340, ffff888097935b40) [ 36.738590] The buggy address belongs to the page: executing program executing program executing program executing program [ 36.743524] page:ffffea00025e4d00 count:1 mapcount:0 mapping:ffff888097934240 index:0x0 compound_mapcount: 0 [ 36.753515] flags: 0xfffe0000008100(slab|head) [ 36.758488] raw: 00fffe0000008100 ffff888097934240 0000000000000000 0000000100000003 [ 36.766898] raw: ffffea00025fd0a0 ffffea0002609b20 ffff88812fe54c40 0000000000000000 [ 36.774781] page dumped because: kasan: bad access detected [ 36.780490] [ 36.782114] Memory state around the buggy address: [ 36.787057] ffff888097935200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc executing program executing program executing program executing program executing program executing program executing program executing program [ 36.794435] ffff888097935280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 36.802203] >ffff888097935300: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 36.810438] ^ [ 36.817049] ffff888097935380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.824417] ffff888097935400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.831872] ================================================================== [ 36.839231] Disabling lock debugging due to kernel taint 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 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 [ 37.821098] Kernel panic - not syncing: panic_on_warn set ... [ 37.821098] [ 37.828520] CPU: 1 PID: 2796 Comm: kworker/1:2 Tainted: G B 4.14.180-syzkaller #0 [ 37.837299] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.846675] Workqueue: events do_enable_set [ 37.851078] Call Trace: [ 37.853692] dump_stack+0x13e/0x194 [ 37.857339] panic+0x1f9/0x42d [ 37.860537] ? add_taint.cold+0x16/0x16 [ 37.864508] ? preempt_schedule_common+0x4a/0xc0 executing program executing program executing program executing program executing program [ 37.869795] ? l2cap_chan_close+0x4f6/0x770 [ 37.875515] ? ___preempt_schedule+0x16/0x18 [ 37.879930] ? l2cap_chan_close+0x4f6/0x770 [ 37.884269] kasan_end_report+0x43/0x49 [ 37.888282] kasan_report.cold+0x12f/0x2ae [ 37.892515] l2cap_chan_close+0x4f6/0x770 [ 37.896670] ? l2cap_retransmit.isra.0+0x240/0x240 [ 37.901601] ? lock_downgrade+0x6e0/0x6e0 [ 37.905761] do_enable_set+0x45a/0x7f0 [ 37.909767] ? __lock_is_held+0xad/0x140 [ 37.913827] ? lowpan_control_write+0x3f0/0x3f0 executing program executing program executing program [ 37.918675] process_one_work+0x813/0x1540 [ 37.923531] ? pwq_dec_nr_in_flight+0x2b0/0x2b0 [ 37.928201] ? worker_thread+0x15d/0x1070 [ 37.932347] ? _raw_spin_unlock_irq+0x24/0x80 [ 37.937195] worker_thread+0x5d1/0x1070 [ 37.941174] ? process_one_work+0x1540/0x1540 [ 37.945670] kthread+0x30d/0x420 [ 37.949044] ? kthread_create_on_node+0xd0/0xd0 [ 37.953716] ret_from_fork+0x24/0x30 [ 37.958926] Kernel Offset: disabled [ 37.962732] Rebooting in 86400 seconds..