Warning: Permanently added '10.128.0.228' (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: [ 40.854320] audit: type=1400 audit(1589773311.990:8): avc: denied { execmem } for pid=6466 comm="syz-executor638" 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 [ 40.919734] ================================================================== [ 40.927259] BUG: KASAN: use-after-free in l2cap_chan_close+0x586/0x810 [ 40.933941] Read of size 1 at addr ffff88808e5ad320 by task kworker/0:1/14 [ 40.940960] [ 40.942628] CPU: 0 PID: 14 Comm: kworker/0:1 Not tainted 4.19.123-syzkaller #0 [ 40.950071] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.959951] Workqueue: events do_enable_set [ 40.964272] Call Trace: executing program executing program executing program [ 40.966911] dump_stack+0x188/0x20d [ 40.970545] ? l2cap_chan_close+0x586/0x810 [ 40.974874] print_address_description.cold+0x7c/0x212 [ 40.980160] ? l2cap_chan_close+0x586/0x810 [ 40.984485] kasan_report.cold+0x88/0x2b9 [ 40.988664] l2cap_chan_close+0x586/0x810 [ 40.992832] ? l2cap_connect_create_rsp+0x6f0/0x6f0 [ 40.997866] ? trace_hardirqs_off+0x50/0x200 [ 41.002290] do_enable_set+0x4c5/0x8d0 [ 41.006183] ? process_one_work+0x82c/0x1640 [ 41.010598] ? lowpan_control_write+0x480/0x480 [ 41.015285] ? __lock_is_held+0xad/0x140 [ 41.019625] process_one_work+0x91f/0x1640 [ 41.023869] ? pwq_dec_nr_in_flight+0x310/0x310 [ 41.028554] worker_thread+0x96/0xe20 [ 41.032366] ? process_one_work+0x1640/0x1640 [ 41.036872] kthread+0x34a/0x420 [ 41.040241] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 41.045782] ret_from_fork+0x24/0x30 [ 41.049502] [ 41.051123] Allocated by task 14: [ 41.054583] kasan_kmalloc+0xbf/0xe0 [ 41.058300] kmem_cache_alloc_trace+0x14d/0x7a0 [ 41.062970] l2cap_chan_create+0x40/0x380 [ 41.067300] chan_create+0xc/0xd0 [ 41.070752] do_enable_set+0x507/0x8d0 [ 41.074638] process_one_work+0x91f/0x1640 [ 41.078871] worker_thread+0x96/0xe20 [ 41.082670] kthread+0x34a/0x420 [ 41.086034] ret_from_fork+0x24/0x30 [ 41.089742] [ 41.091361] Freed by task 24: [ 41.094464] __kasan_slab_free+0xf7/0x140 [ 41.098639] kfree+0xce/0x220 [ 41.101746] l2cap_chan_put+0x35/0x40 [ 41.105547] do_enable_set+0x4d1/0x8d0 [ 41.109435] process_one_work+0x91f/0x1640 [ 41.113668] worker_thread+0x96/0xe20 [ 41.117497] kthread+0x34a/0x420 [ 41.120857] ret_from_fork+0x24/0x30 [ 41.124561] [ 41.126185] The buggy address belongs to the object at ffff88808e5ad300 [ 41.126185] which belongs to the cache kmalloc-2048 of size 2048 [ 41.139019] The buggy address is located 32 bytes inside of [ 41.139019] 2048-byte region [ffff88808e5ad300, ffff88808e5adb00) [ 41.150894] The buggy address belongs to the page: [ 41.155828] page:ffffea0002396b00 count:1 mapcount:0 mapping:ffff88812c39cc40 index:0x0 compound_mapcount: 0 [ 41.165797] flags: 0xfffe0000008100(slab|head) [ 41.170387] raw: 00fffe0000008100 ffffea0002396c08 ffffea0002998188 ffff88812c39cc40 [ 41.178285] raw: 0000000000000000 ffff88808e5ac200 0000000100000003 0000000000000000 [ 41.186160] page dumped because: kasan: bad access detected [ 41.191867] [ 41.193491] Memory state around the buggy address: [ 41.198422] ffff88808e5ad200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 41.208908] ffff88808e5ad280: 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 [ 41.216269] >ffff88808e5ad300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 41.223626] ^ [ 41.228035] ffff88808e5ad380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 41.235394] ffff88808e5ad400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 41.242747] ================================================================== [ 41.250100] 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 [ 41.566604] Kernel panic - not syncing: panic_on_warn set ... [ 41.566604] [ 41.574026] CPU: 0 PID: 14 Comm: kworker/0:1 Tainted: G B 4.19.123-syzkaller #0 [ 41.582774] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.592134] Workqueue: events do_enable_set [ 41.596460] Call Trace: [ 41.599044] dump_stack+0x188/0x20d [ 41.602671] panic+0x26a/0x50e [ 41.605861] ? __warn_printk+0xf3/0xf3 [ 41.609749] ? preempt_schedule_common+0x4a/0xc0 executing program executing program executing program [ 41.614509] ? l2cap_chan_close+0x586/0x810 [ 41.618834] ? ___preempt_schedule+0x16/0x18 [ 41.623245] ? trace_hardirqs_on+0x55/0x210 [ 41.627584] ? l2cap_chan_close+0x586/0x810 [ 41.631903] kasan_end_report+0x43/0x49 [ 41.635888] kasan_report.cold+0xa4/0x2b9 [ 41.640037] l2cap_chan_close+0x586/0x810 [ 41.644190] ? l2cap_connect_create_rsp+0x6f0/0x6f0 [ 41.649213] ? trace_hardirqs_off+0x50/0x200 [ 41.653624] do_enable_set+0x4c5/0x8d0 [ 41.657512] ? process_one_work+0x82c/0x1640 [ 41.661918] ? lowpan_control_write+0x480/0x480 [ 41.666585] ? __lock_is_held+0xad/0x140 [ 41.670676] process_one_work+0x91f/0x1640 [ 41.674914] ? pwq_dec_nr_in_flight+0x310/0x310 [ 41.679591] worker_thread+0x96/0xe20 [ 41.683398] ? process_one_work+0x1640/0x1640 [ 41.687891] kthread+0x34a/0x420 [ 41.691256] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 41.696793] ret_from_fork+0x24/0x30 [ 41.701900] Kernel Offset: disabled [ 41.705527] Rebooting in 86400 seconds..