[ OK ] Reached target Multi-User System. [ 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. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.139' (ECDSA) to the list of known hosts. syzkaller login: [ 96.357185] audit: type=1400 audit(1596674024.520:8): avc: denied { execmem } for pid=6446 comm="syz-executor289" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 96.377573] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 99.334031] ================================================================== [ 99.341515] BUG: KASAN: use-after-free in __list_del_entry_valid+0xcc/0xef [ 99.348576] Read of size 8 at addr ffff88808a9d3b50 by task syz-executor289/7079 [ 99.356128] [ 99.357757] CPU: 0 PID: 7079 Comm: syz-executor289 Not tainted 4.19.137-syzkaller #0 [ 99.366074] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 99.375449] Call Trace: [ 99.378205] dump_stack+0x1fc/0x2fe [ 99.381820] print_address_description.cold+0x54/0x219 [ 99.387084] kasan_report_error.cold+0x8a/0x1c7 [ 99.391752] ? __list_del_entry_valid+0xcc/0xef [ 99.396404] __asan_report_load8_noabort+0x88/0x90 [ 99.401329] ? __list_del_entry_valid+0xcc/0xef [ 99.405997] __list_del_entry_valid+0xcc/0xef [ 99.410492] l2cap_chan_put+0x5e/0x1c0 [ 99.414379] l2cap_sock_destruct+0x47/0xf0 [ 99.418629] ? l2cap_sock_bind+0x750/0x750 [ 99.422848] __sk_destruct+0x4b/0x810 [ 99.426637] __sk_free+0x165/0x3b0 [ 99.430231] sk_free+0x3b/0x50 [ 99.433444] l2cap_sock_kill.part.0+0x6b/0x80 [ 99.437943] l2cap_sock_release+0x158/0x190 [ 99.442262] __sock_release+0xcd/0x2a0 [ 99.446151] ? __sock_release+0x2a0/0x2a0 [ 99.450296] sock_close+0x15/0x20 [ 99.453748] __fput+0x2ce/0x890 [ 99.457031] task_work_run+0x148/0x1c0 [ 99.460908] exit_to_usermode_loop+0x251/0x2a0 [ 99.465497] do_syscall_64+0x538/0x620 [ 99.469389] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 99.474562] RIP: 0033:0x405c61 [ 99.477752] Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 99.496660] RSP: 002b:00007ffea2c16330 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 99.504371] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000405c61 [ 99.511656] RDX: fffffffffffffff7 RSI: 0000000020000180 RDI: 0000000000000004 [ 99.518954] RBP: 00007ffea2c16370 R08: 0000000000000004 R09: 00007ffea2c162e0 [ 99.526217] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000018402 [ 99.533509] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 99.540785] [ 99.542396] Allocated by task 7079: [ 99.546011] kmem_cache_alloc_trace+0x12f/0x380 [ 99.550677] l2cap_chan_create+0x40/0x380 [ 99.554815] l2cap_sock_alloc.constprop.0+0x16c/0x210 [ 99.560009] l2cap_sock_create+0x110/0x1b0 [ 99.564317] bt_sock_create+0x154/0x2a0 [ 99.568275] __sock_create+0x3d8/0x740 [ 99.572156] __sys_socket+0xef/0x200 [ 99.575874] __x64_sys_socket+0x6f/0xb0 [ 99.579831] do_syscall_64+0xf9/0x620 [ 99.583633] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 99.588800] [ 99.590407] Freed by task 6472: [ 99.593670] kfree+0xcc/0x210 [ 99.596755] l2cap_chan_put+0x16b/0x1c0 [ 99.600724] l2cap_recv_frame+0xd36/0xa550 [ 99.604938] l2cap_recv_acldata+0x80e/0x910 [ 99.609239] hci_rx_work+0x455/0xa90 [ 99.612944] process_one_work+0x864/0x1570 [ 99.617171] worker_thread+0x64c/0x1130 [ 99.621142] kthread+0x30b/0x410 [ 99.624503] ret_from_fork+0x24/0x30 [ 99.628192] [ 99.629802] The buggy address belongs to the object at ffff88808a9d3700 [ 99.629802] which belongs to the cache kmalloc-2048 of size 2048 [ 99.642629] The buggy address is located 1104 bytes inside of [ 99.642629] 2048-byte region [ffff88808a9d3700, ffff88808a9d3f00) [ 99.654670] The buggy address belongs to the page: [ 99.659598] page:ffffea00022a7480 count:1 mapcount:0 mapping:ffff88812c39cc40 index:0x0 compound_mapcount: 0 [ 99.669563] flags: 0xfffe0000008100(slab|head) [ 99.674144] raw: 00fffe0000008100 ffffea000231e108 ffff88812c394948 ffff88812c39cc40 [ 99.682025] raw: 0000000000000000 ffff88808a9d2600 0000000100000003 0000000000000000 [ 99.689888] page dumped because: kasan: bad access detected [ 99.695577] [ 99.697215] Memory state around the buggy address: [ 99.702136] ffff88808a9d3a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 99.709494] ffff88808a9d3a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 99.716837] >ffff88808a9d3b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 99.724179] ^ [ 99.730146] ffff88808a9d3b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 99.737490] ffff88808a9d3c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 99.744832] ================================================================== [ 99.752219] Disabling lock debugging due to kernel taint [ 99.757907] Kernel panic - not syncing: panic_on_warn set ... [ 99.757907] [ 99.765285] CPU: 0 PID: 7079 Comm: syz-executor289 Tainted: G B 4.19.137-syzkaller #0 [ 99.766069] Bluetooth: hci0: command 0x0409 tx timeout [ 99.774558] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 99.789162] Call Trace: [ 99.791767] dump_stack+0x1fc/0x2fe [ 99.795401] panic+0x26a/0x50e [ 99.798599] ? __warn_printk+0xf3/0xf3 [ 99.802511] ? retint_kernel+0x2d/0x2d [ 99.806404] ? trace_hardirqs_on+0x55/0x210 [ 99.810731] kasan_end_report+0x43/0x49 [ 99.814714] kasan_report_error.cold+0xa7/0x1c7 [ 99.819396] ? __list_del_entry_valid+0xcc/0xef [ 99.824058] __asan_report_load8_noabort+0x88/0x90 [ 99.828979] ? __list_del_entry_valid+0xcc/0xef [ 99.833635] __list_del_entry_valid+0xcc/0xef [ 99.838113] l2cap_chan_put+0x5e/0x1c0 [ 99.841997] l2cap_sock_destruct+0x47/0xf0 [ 99.846250] ? l2cap_sock_bind+0x750/0x750 [ 99.850482] __sk_destruct+0x4b/0x810 [ 99.854265] __sk_free+0x165/0x3b0 [ 99.857785] sk_free+0x3b/0x50 [ 99.860961] l2cap_sock_kill.part.0+0x6b/0x80 [ 99.865447] l2cap_sock_release+0x158/0x190 [ 99.869765] __sock_release+0xcd/0x2a0 [ 99.873632] ? __sock_release+0x2a0/0x2a0 [ 99.877762] sock_close+0x15/0x20 [ 99.881195] __fput+0x2ce/0x890 [ 99.884457] task_work_run+0x148/0x1c0 [ 99.888343] exit_to_usermode_loop+0x251/0x2a0 [ 99.892923] do_syscall_64+0x538/0x620 [ 99.896802] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 99.901996] RIP: 0033:0x405c61 [ 99.905173] Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 99.924063] RSP: 002b:00007ffea2c16330 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 99.931774] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000405c61 [ 99.939033] RDX: fffffffffffffff7 RSI: 0000000020000180 RDI: 0000000000000004 [ 99.946290] RBP: 00007ffea2c16370 R08: 0000000000000004 R09: 00007ffea2c162e0 [ 99.953557] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000018402 [ 99.960809] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 99.969136] Kernel Offset: disabled [ 99.972762] Rebooting in 86400 seconds..