Warning: Permanently added '10.128.0.114' (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 syzkaller login: [ 548.143217] audit: type=1400 audit(1596523693.796:8): avc: denied { execmem } for pid=6464 comm="syz-executor800" 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 [ 548.218765] ================================================================== [ 548.226417] BUG: KASAN: use-after-free in l2cap_chan_close+0x58b/0x820 [ 548.233087] Read of size 1 at addr ffff8880a517e1a0 by task kworker/0:2/3402 [ 548.240256] [ 548.241883] CPU: 0 PID: 3402 Comm: kworker/0:2 Not tainted 4.19.136-syzkaller #0 [ 548.249415] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 548.258832] Workqueue: events do_enable_set [ 548.263146] Call Trace: [ 548.265776] dump_stack+0x1fc/0x2fe [ 548.269408] print_address_description.cold+0x54/0x219 [ 548.274681] kasan_report_error.cold+0x8a/0x1c7 [ 548.279346] ? l2cap_chan_close+0x58b/0x820 [ 548.283660] __asan_report_load1_noabort+0x88/0x90 [ 548.288588] ? l2cap_chan_close+0x58b/0x820 [ 548.292903] l2cap_chan_close+0x58b/0x820 [ 548.297046] ? __set_monitor_timer+0x130/0x130 [ 548.301620] ? lock_downgrade+0x720/0x720 [ 548.305769] ? lock_acquire+0x170/0x3c0 [ 548.309802] ? debug_object_deactivate+0xfc/0x2e0 [ 548.314663] ? trace_hardirqs_off+0x64/0x200 [ 548.319072] do_enable_set+0x4e3/0x975 [ 548.322954] ? process_one_work+0x77b/0x1570 [ 548.327361] ? chan_recv_cb+0xa70/0xa70 [ 548.331330] ? check_preemption_disabled+0x41/0x280 [ 548.336345] process_one_work+0x864/0x1570 [ 548.340585] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 548.345272] worker_thread+0x64c/0x1130 [ 548.349252] ? __kthread_parkme+0xfd/0x1b0 [ 548.353481] ? process_one_work+0x1570/0x1570 [ 548.357971] kthread+0x30b/0x410 [ 548.361347] ? kthread_park+0x180/0x180 [ 548.365398] ret_from_fork+0x24/0x30 [ 548.369121] [ 548.370741] Allocated by task 3402: [ 548.374369] kmem_cache_alloc_trace+0x12f/0x380 [ 548.379036] l2cap_chan_create+0x40/0x380 [ 548.383177] do_enable_set+0x525/0x975 [ 548.387059] process_one_work+0x864/0x1570 [ 548.391282] worker_thread+0x64c/0x1130 [ 548.395248] kthread+0x30b/0x410 [ 548.398608] ret_from_fork+0x24/0x30 [ 548.402304] [ 548.403917] Freed by task 2927: [ 548.407275] kfree+0xcc/0x210 [ 548.410374] l2cap_chan_put+0x16b/0x1c0 [ 548.414340] do_enable_set+0x4ef/0x975 [ 548.418216] process_one_work+0x864/0x1570 [ 548.422456] worker_thread+0x64c/0x1130 [ 548.426420] kthread+0x30b/0x410 [ 548.429778] ret_from_fork+0x24/0x30 [ 548.433474] [ 548.435092] The buggy address belongs to the object at ffff8880a517e180 [ 548.435092] which belongs to the cache kmalloc-2048 of size 2048 [ 548.447916] The buggy address is located 32 bytes inside of [ 548.447916] 2048-byte region [ffff8880a517e180, ffff8880a517e980) [ 548.459883] The buggy address belongs to the page: [ 548.464816] page:ffffea0002945f80 count:1 mapcount:0 mapping:ffff88812c39cc40 index:0x0 compound_mapcount: 0 [ 548.474774] flags: 0xfffe0000008100(slab|head) [ 548.479964] raw: 00fffe0000008100 ffffea000295f508 ffffea000294a508 ffff88812c39cc40 [ 548.487840] raw: 0000000000000000 ffff8880a517e180 0000000100000003 0000000000000000 [ 548.495704] page dumped because: kasan: bad access detected [ 548.501401] [ 548.503013] Memory state around the buggy address: [ 548.507934] ffff8880a517e080: 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 [ 548.515282] ffff8880a517e100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 548.522630] >ffff8880a517e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 548.529976] ^ [ 548.534372] ffff8880a517e200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 548.541721] ffff8880a517e280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 548.549064] ================================================================== [ 548.556409] 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 [ 548.702509] Kernel panic - not syncing: panic_on_warn set ... [ 548.702509] [ 548.709920] CPU: 0 PID: 3402 Comm: kworker/0:2 Tainted: G B 4.19.136-syzkaller #0 [ 548.718836] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 548.728192] Workqueue: events do_enable_set [ 548.732511] Call Trace: [ 548.735105] dump_stack+0x1fc/0x2fe [ 548.738760] panic+0x26a/0x50e [ 548.741955] ? __warn_printk+0xf3/0xf3 [ 548.745847] ? preempt_schedule_common+0x45/0xc0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 548.750608] ? ___preempt_schedule+0x16/0x18 [ 548.755045] ? trace_hardirqs_on+0x55/0x210 [ 548.759373] kasan_end_report+0x43/0x49 [ 548.763350] kasan_report_error.cold+0xa7/0x1c7 [ 548.768022] ? l2cap_chan_close+0x58b/0x820 [ 548.772344] __asan_report_load1_noabort+0x88/0x90 [ 548.777277] ? l2cap_chan_close+0x58b/0x820 [ 548.781600] l2cap_chan_close+0x58b/0x820 [ 548.785749] ? __set_monitor_timer+0x130/0x130 [ 548.790345] ? lock_downgrade+0x720/0x720 [ 548.794494] ? lock_acquire+0x170/0x3c0 [ 548.798471] ? debug_object_deactivate+0xfc/0x2e0 [ 548.803314] ? trace_hardirqs_off+0x64/0x200 [ 548.807727] do_enable_set+0x4e3/0x975 [ 548.811615] ? process_one_work+0x77b/0x1570 [ 548.816030] ? chan_recv_cb+0xa70/0xa70 [ 548.820010] ? check_preemption_disabled+0x41/0x280 [ 548.825033] process_one_work+0x864/0x1570 [ 548.829270] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 548.833945] worker_thread+0x64c/0x1130 [ 548.837926] ? __kthread_parkme+0xfd/0x1b0 [ 548.842192] ? process_one_work+0x1570/0x1570 [ 548.846689] kthread+0x30b/0x410 [ 548.850057] ? kthread_park+0x180/0x180 [ 548.854041] ret_from_fork+0x24/0x30 [ 548.858877] Kernel Offset: disabled [ 548.862529] Rebooting in 86400 seconds..