[ 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 '10.128.10.21' (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 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: [ 36.840542] audit: type=1400 audit(1596726478.036:8): avc: denied { execmem } for pid=6361 comm="syz-executor456" 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 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 [ 37.240877] ================================================================== [ 37.248382] BUG: KASAN: use-after-free in ex_handler_refcount+0x164/0x1a0 [ 37.255309] Write of size 4 at addr ffff888087e1b258 by task kworker/1:2/2700 [ 37.262573] [ 37.264199] CPU: 1 PID: 2700 Comm: kworker/1:2 Not tainted 4.14.192-syzkaller #0 [ 37.271723] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.281084] Workqueue: events do_enable_set [ 37.285401] Call Trace: [ 37.288082] dump_stack+0x1b2/0x283 [ 37.291734] print_address_description.cold+0x54/0x1d3 [ 37.297016] kasan_report_error.cold+0x8a/0x194 [ 37.301685] ? ex_handler_refcount+0x164/0x1a0 [ 37.306289] __asan_report_store4_noabort+0x68/0x70 [ 37.311312] ? ex_handler_refcount+0x164/0x1a0 [ 37.315894] ex_handler_refcount+0x164/0x1a0 [ 37.320298] ? ex_handler_clear_fs+0xb0/0xb0 [ 37.324701] fixup_exception+0x8a/0xc3 [ 37.328589] do_trap+0x61/0x250 [ 37.331870] ? do_error_trap+0x1d0/0x2d0 [ 37.335933] do_error_trap+0x132/0x2d0 [ 37.339817] ? math_error+0x2d0/0x2d0 [ 37.343617] ? inat_get_avx_attribute+0x52f2/0x6a9a [ 37.348639] ? __lock_acquire+0x5fc/0x3f20 [ 37.352882] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.357727] invalid_op+0x1b/0x40 [ 37.361180] RIP: 0010:inat_get_avx_attribute+0x52f2/0x6a9a [ 37.366793] RSP: 0018:ffff88809f827c88 EFLAGS: 00010297 [ 37.372152] RAX: ffff88809fd5c340 RBX: 0000000000000001 RCX: ffff888087e1b258 [ 37.379419] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888087e1b240 [ 37.386684] RBP: ffff888087e1b240 R08: ffffffff8a07b358 R09: 000000000004057a [ 37.393948] R10: ffff88809fd5cbf0 R11: ffff88809fd5c340 R12: ffff8880971c5c10 [ 37.401214] R13: ffff88809ff7bf00 R14: ffff8880aeb2ad00 R15: ffff8880971c5c00 [ 37.408501] ? l2cap_chan_put+0x10/0x1b0 [ 37.412569] do_enable_set+0x47f/0x8a0 [ 37.416463] ? lock_acquire+0x170/0x3f0 [ 37.420435] ? chan_recv_cb+0x970/0x970 [ 37.424411] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 37.429871] process_one_work+0x793/0x14a0 [ 37.434111] ? work_busy+0x320/0x320 [ 37.437825] ? worker_thread+0x158/0xff0 [ 37.441893] ? _raw_spin_unlock_irq+0x24/0x80 [ 37.446390] worker_thread+0x5cc/0xff0 [ 37.450321] ? rescuer_thread+0xc80/0xc80 [ 37.454466] kthread+0x30d/0x420 [ 37.457831] ? kthread_create_on_node+0xd0/0xd0 [ 37.462526] ret_from_fork+0x24/0x30 [ 37.466264] [ 37.467890] Allocated by task 2700: [ 37.471512] kasan_kmalloc+0xeb/0x160 [ 37.475339] kmem_cache_alloc_trace+0x131/0x3d0 [ 37.480010] l2cap_chan_create+0x3e/0x3c0 [ 37.484153] do_enable_set+0x4ac/0x8a0 [ 37.488062] process_one_work+0x793/0x14a0 [ 37.492295] worker_thread+0x5cc/0xff0 [ 37.496214] kthread+0x30d/0x420 [ 37.499578] ret_from_fork+0x24/0x30 [ 37.503278] [ 37.505865] Freed by task 3653: [ 37.509143] kasan_slab_free+0xc3/0x1a0 [ 37.513121] kfree+0xc9/0x250 [ 37.516222] l2cap_chan_put+0x152/0x1b0 [ 37.520193] do_enable_set+0x47f/0x8a0 [ 37.524074] process_one_work+0x793/0x14a0 [ 37.528305] worker_thread+0x5cc/0xff0 [ 37.532185] kthread+0x30d/0x420 [ 37.535547] ret_from_fork+0x24/0x30 [ 37.539248] [ 37.541825] The buggy address belongs to the object at ffff888087e1b240 [ 37.541825] which belongs to the cache kmalloc-2048 of size 2048 [ 37.554653] The buggy address is located 24 bytes inside of [ 37.554653] 2048-byte region [ffff888087e1b240, ffff888087e1ba40) [ 37.566524] The buggy address belongs to the page: [ 37.571448] page:ffffea00021f8680 count:1 mapcount:0 mapping:ffff888087e1a140 index:0x0 compound_mapcount: 0 [ 37.581415] flags: 0xfffe0000008100(slab|head) [ 37.585991] raw: 00fffe0000008100 ffff888087e1a140 0000000000000000 0000000100000003 [ 37.593865] raw: ffffea00025cc620 ffffea00025bdf20 ffff88812fe52c40 0000000000000000 [ 37.601740] page dumped because: kasan: bad access detected [ 37.607442] [ 37.609065] Memory state around the buggy address: [ 37.614016] ffff888087e1b100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.621421] ffff888087e1b180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 37.628785] >ffff888087e1b200: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 37.636134] ^ 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 [ 37.642359] ffff888087e1b280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.649717] ffff888087e1b300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.657073] ================================================================== [ 37.664467] Disabling lock debugging due to kernel taint [ 37.673284] Kernel panic - not syncing: panic_on_warn set ... [ 37.673284] [ 37.680656] CPU: 1 PID: 2700 Comm: kworker/1:2 Tainted: G B 4.14.192-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 executing program [ 37.689411] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.698771] Workqueue: events do_enable_set [ 37.703085] Call Trace: [ 37.705665] dump_stack+0x1b2/0x283 [ 37.709288] panic+0x1f9/0x42d [ 37.712500] ? add_taint.cold+0x16/0x16 [ 37.716498] ? ___preempt_schedule+0x16/0x18 [ 37.720906] kasan_end_report+0x43/0x49 [ 37.724878] kasan_report_error.cold+0xa7/0x194 [ 37.729549] ? ex_handler_refcount+0x164/0x1a0 [ 37.734132] __asan_report_store4_noabort+0x68/0x70 [ 37.739148] ? ex_handler_refcount+0x164/0x1a0 [ 37.743727] ex_handler_refcount+0x164/0x1a0 [ 37.748130] ? ex_handler_clear_fs+0xb0/0xb0 [ 37.752533] fixup_exception+0x8a/0xc3 [ 37.756415] do_trap+0x61/0x250 [ 37.759704] ? do_error_trap+0x1d0/0x2d0 [ 37.763760] do_error_trap+0x132/0x2d0 [ 37.767644] ? math_error+0x2d0/0x2d0 [ 37.771472] ? inat_get_avx_attribute+0x52f2/0x6a9a [ 37.776483] ? __lock_acquire+0x5fc/0x3f20 [ 37.780712] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.785551] invalid_op+0x1b/0x40 [ 37.788998] RIP: 0010:inat_get_avx_attribute+0x52f2/0x6a9a [ 37.794610] RSP: 0018:ffff88809f827c88 EFLAGS: 00010297 [ 37.799966] RAX: ffff88809fd5c340 RBX: 0000000000000001 RCX: ffff888087e1b258 [ 37.807690] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888087e1b240 [ 37.815065] RBP: ffff888087e1b240 R08: ffffffff8a07b358 R09: 000000000004057a [ 37.822332] R10: ffff88809fd5cbf0 R11: ffff88809fd5c340 R12: ffff8880971c5c10 [ 37.829594] R13: ffff88809ff7bf00 R14: ffff8880aeb2ad00 R15: ffff8880971c5c00 [ 37.836871] ? l2cap_chan_put+0x10/0x1b0 [ 37.840930] do_enable_set+0x47f/0x8a0 [ 37.844821] ? lock_acquire+0x170/0x3f0 [ 37.848791] ? chan_recv_cb+0x970/0x970 [ 37.852760] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 37.858205] process_one_work+0x793/0x14a0 [ 37.862446] ? work_busy+0x320/0x320 [ 37.866154] ? worker_thread+0x158/0xff0 [ 37.870214] ? _raw_spin_unlock_irq+0x24/0x80 [ 37.874706] worker_thread+0x5cc/0xff0 [ 37.878590] ? rescuer_thread+0xc80/0xc80 [ 37.882730] kthread+0x30d/0x420 [ 37.886089] ? kthread_create_on_node+0xd0/0xd0 [ 37.890753] ret_from_fork+0x24/0x30 [ 37.895572] Kernel Offset: disabled [ 37.899186] Rebooting in 86400 seconds..