Warning: Permanently added '10.128.0.196' (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 executing program executing program syzkaller login: [ 47.162013] audit: type=1400 audit(1596853400.598:8): avc: denied { execmem } for pid=6351 comm="syz-executor498" 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 [ 47.258082] ================================================================== [ 47.265569] BUG: KASAN: use-after-free in l2cap_chan_close+0x4fb/0x770 [ 47.272231] Read of size 1 at addr ffff888097aa4a60 by task kworker/1:0/18 [ 47.279233] [ 47.280858] CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 4.14.193-syzkaller #0 [ 47.288207] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.297561] Workqueue: events do_enable_set [ 47.301877] Call Trace: [ 47.304462] dump_stack+0x1b2/0x283 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 47.308091] print_address_description.cold+0x54/0x1d3 [ 47.313370] kasan_report_error.cold+0x8a/0x194 [ 47.318035] ? l2cap_chan_close+0x4fb/0x770 [ 47.322350] __asan_report_load1_noabort+0x68/0x70 [ 47.327279] ? l2cap_chan_close+0x4fb/0x770 [ 47.331596] l2cap_chan_close+0x4fb/0x770 [ 47.335741] ? __set_monitor_timer+0x110/0x110 [ 47.340322] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 47.345427] do_enable_set+0x473/0x8a0 [ 47.349323] ? lock_acquire+0x170/0x3f0 [ 47.353298] ? chan_recv_cb+0x970/0x970 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 47.357269] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 47.362714] process_one_work+0x793/0x14a0 [ 47.366950] ? work_busy+0x320/0x320 [ 47.370661] ? worker_thread+0x158/0xff0 [ 47.374719] ? _raw_spin_unlock_irq+0x24/0x80 [ 47.379213] worker_thread+0x5cc/0xff0 [ 47.383101] ? rescuer_thread+0xc80/0xc80 [ 47.387245] kthread+0x30d/0x420 [ 47.390606] ? kthread_create_on_node+0xd0/0xd0 [ 47.395269] ret_from_fork+0x24/0x30 [ 47.398982] [ 47.400601] Allocated by task 18: [ 47.404049] kasan_kmalloc+0xeb/0x160 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 47.407844] kmem_cache_alloc_trace+0x131/0x3d0 [ 47.412508] l2cap_chan_create+0x3e/0x3c0 [ 47.416647] do_enable_set+0x4ac/0x8a0 [ 47.420538] process_one_work+0x793/0x14a0 [ 47.424765] worker_thread+0x5cc/0xff0 [ 47.428656] kthread+0x30d/0x420 [ 47.432020] ret_from_fork+0x24/0x30 [ 47.435722] [ 47.437344] Freed by task 2749: [ 47.440619] kasan_slab_free+0xc3/0x1a0 [ 47.444696] kfree+0xc9/0x250 [ 47.447799] l2cap_chan_put+0x152/0x1b0 [ 47.451765] do_enable_set+0x47f/0x8a0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 47.455646] process_one_work+0x793/0x14a0 [ 47.459876] worker_thread+0x5cc/0xff0 [ 47.463755] kthread+0x30d/0x420 [ 47.467118] ret_from_fork+0x24/0x30 [ 47.470818] [ 47.472436] The buggy address belongs to the object at ffff888097aa4a40 [ 47.472436] which belongs to the cache kmalloc-2048 of size 2048 [ 47.485259] The buggy address is located 32 bytes inside of [ 47.485259] 2048-byte region [ffff888097aa4a40, ffff888097aa5240) [ 47.497207] The buggy address belongs to the page: executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 47.502125] page:ffffea00025ea900 count:1 mapcount:0 mapping:ffff888097aa41c0 index:0x0 compound_mapcount: 0 [ 47.512103] flags: 0xfffe0000008100(slab|head) [ 47.516696] raw: 00fffe0000008100 ffff888097aa41c0 0000000000000000 0000000100000003 [ 47.524570] raw: ffffea00025f1620 ffffea00025d48a0 ffff88812fe52c40 0000000000000000 [ 47.532437] page dumped because: kasan: bad access detected [ 47.538166] [ 47.539783] Memory state around the buggy address: [ 47.544702] ffff888097aa4900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 47.552053] ffff888097aa4980: 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 47.559402] >ffff888097aa4a00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 47.566750] ^ [ 47.573234] ffff888097aa4a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 47.580585] ffff888097aa4b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 47.587931] ================================================================== [ 47.595283] 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 [ 47.642853] Kernel panic - not syncing: panic_on_warn set ... [ 47.642853] [ 47.650240] CPU: 1 PID: 18 Comm: kworker/1:0 Tainted: G B 4.14.193-syzkaller #0 [ 47.658805] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.668163] Workqueue: events do_enable_set [ 47.672473] Call Trace: [ 47.675054] dump_stack+0x1b2/0x283 [ 47.678677] panic+0x1f9/0x42d [ 47.681865] ? add_taint.cold+0x16/0x16 [ 47.685837] ? ___preempt_schedule+0x16/0x18 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 47.690242] kasan_end_report+0x43/0x49 [ 47.694211] kasan_report_error.cold+0xa7/0x194 [ 47.698873] ? l2cap_chan_close+0x4fb/0x770 [ 47.703273] __asan_report_load1_noabort+0x68/0x70 [ 47.708195] ? l2cap_chan_close+0x4fb/0x770 [ 47.712510] l2cap_chan_close+0x4fb/0x770 [ 47.716653] ? __set_monitor_timer+0x110/0x110 [ 47.721246] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 47.726345] do_enable_set+0x473/0x8a0 [ 47.730226] ? lock_acquire+0x170/0x3f0 [ 47.734191] ? chan_recv_cb+0x970/0x970 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 47.738156] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 47.743597] process_one_work+0x793/0x14a0 [ 47.747831] ? work_busy+0x320/0x320 [ 47.751534] ? worker_thread+0x158/0xff0 [ 47.755588] ? _raw_spin_unlock_irq+0x24/0x80 [ 47.760075] worker_thread+0x5cc/0xff0 [ 47.763956] ? rescuer_thread+0xc80/0xc80 [ 47.768098] kthread+0x30d/0x420 [ 47.771460] ? kthread_create_on_node+0xd0/0xd0 [ 47.776121] ret_from_fork+0x24/0x30 [ 47.780992] Kernel Offset: disabled [ 47.784601] Rebooting in 86400 seconds..