[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.67' (ECDSA) to the list of known hosts. syzkaller login: [ 234.102755] 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 [ 236.148665] Bluetooth: hci0: command 0x0409 tx timeout executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 238.227998] Bluetooth: hci0: command 0x041b tx timeout executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 240.307615] Bluetooth: hci0: command 0x040f tx timeout executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 242.387384] Bluetooth: hci0: command 0x0419 tx timeout executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 244.467192] Bluetooth: hci0: command 0x0405 tx timeout executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 246.546968] Bluetooth: hci0: command 0x0405 tx timeout executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 274.785070] ================================================================== [ 274.792454] BUG: KASAN: use-after-free in __lock_acquire+0x2cb4/0x3ff0 [ 274.799102] Read of size 8 at addr ffff8880b25a4d20 by task kworker/1:1/34 [ 274.806108] [ 274.807724] CPU: 1 PID: 34 Comm: kworker/1:1 Not tainted 4.19.211-syzkaller #0 [ 274.815057] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 274.824400] Workqueue: events sco_sock_timeout [ 274.828960] Call Trace: [ 274.831537] dump_stack+0x1fc/0x2ef [ 274.835153] print_address_description.cold+0x54/0x219 [ 274.840423] kasan_report_error.cold+0x8a/0x1b9 [ 274.845079] ? __lock_acquire+0x2cb4/0x3ff0 [ 274.849385] __asan_report_load8_noabort+0x88/0x90 [ 274.854298] ? __lock_acquire+0x2cb4/0x3ff0 [ 274.858616] __lock_acquire+0x2cb4/0x3ff0 [ 274.862823] ? mark_held_locks+0xf0/0xf0 [ 274.866879] ? mark_held_locks+0xf0/0xf0 [ 274.870929] ? lock_acquire+0x170/0x3c0 [ 274.874889] ? trace_hardirqs_off+0x64/0x200 [ 274.879281] ? sco_sock_timeout+0x5d/0x1b0 [ 274.883499] lock_acquire+0x170/0x3c0 [ 274.887298] ? sco_sock_timeout+0x7b/0x1b0 [ 274.891523] _raw_spin_lock+0x2a/0x40 [ 274.895316] ? sco_sock_timeout+0x7b/0x1b0 [ 274.899535] sco_sock_timeout+0x7b/0x1b0 [ 274.903594] process_one_work+0x864/0x1570 [ 274.907814] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 274.912467] worker_thread+0x64c/0x1130 [ 274.916423] ? __kthread_parkme+0x133/0x1e0 [ 274.920727] ? process_one_work+0x1570/0x1570 [ 274.925204] kthread+0x33f/0x460 [ 274.928550] ? kthread_park+0x180/0x180 [ 274.932512] ret_from_fork+0x24/0x30 [ 274.936213] [ 274.937818] Allocated by task 8153: [ 274.941425] __kmalloc+0x15a/0x3c0 [ 274.944944] sk_prot_alloc+0x1e2/0x2d0 [ 274.948810] sk_alloc+0x36/0xec0 [ 274.952164] sco_sock_alloc.constprop.0+0x31/0x200 [ 274.957077] sco_sock_create+0xd5/0x180 [ 274.961050] bt_sock_create+0x154/0x2a0 [ 274.965009] __sock_create+0x3d8/0x740 [ 274.968877] __sys_socket+0xef/0x200 [ 274.972571] __x64_sys_socket+0x6f/0xb0 [ 274.976522] do_syscall_64+0xf9/0x620 [ 274.980305] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 274.985467] [ 274.987070] Freed by task 8154: [ 274.990334] kfree+0xcc/0x210 [ 274.993442] __sk_destruct+0x684/0x8a0 [ 274.997318] __sk_free+0x165/0x3b0 [ 275.001274] sk_free+0x3b/0x50 [ 275.004447] sco_sock_kill.part.0+0xaa/0xc0 [ 275.008750] sco_sock_release+0x1a2/0x330 [ 275.012876] __sock_release+0xcd/0x2a0 [ 275.016741] sock_close+0x15/0x20 [ 275.020177] __fput+0x2ce/0x890 [ 275.023451] task_work_run+0x148/0x1c0 [ 275.027412] get_signal+0x1b64/0x1f70 [ 275.031195] do_signal+0x8f/0x1670 [ 275.034716] exit_to_usermode_loop+0x204/0x2a0 [ 275.039276] do_syscall_64+0x538/0x620 [ 275.043151] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 275.048313] [ 275.049919] The buggy address belongs to the object at ffff8880b25a4c80 [ 275.049919] which belongs to the cache kmalloc-2048 of size 2048 [ 275.062730] The buggy address is located 160 bytes inside of [ 275.062730] 2048-byte region [ffff8880b25a4c80, ffff8880b25a5480) [ 275.074680] The buggy address belongs to the page: [ 275.079591] page:ffffea0002c96900 count:1 mapcount:0 mapping:ffff88813bff0c40 index:0x0 compound_mapcount: 0 [ 275.089550] flags: 0xfff00000008100(slab|head) [ 275.094117] raw: 00fff00000008100 ffffea0002541c08 ffffea0002544388 ffff88813bff0c40 [ 275.101980] raw: 0000000000000000 ffff8880b25a4400 0000000100000003 0000000000000000 [ 275.109921] page dumped because: kasan: bad access detected [ 275.115690] [ 275.117295] Memory state around the buggy address: [ 275.122201] ffff8880b25a4c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 275.129624] ffff8880b25a4c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 275.136960] >ffff8880b25a4d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 275.144292] ^ [ 275.148679] ffff8880b25a4d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 275.156534] ffff8880b25a4e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 275.163866] ================================================================== [ 275.171201] Disabling lock debugging due to kernel taint [ 275.176629] Kernel panic - not syncing: panic_on_warn set ... [ 275.176629] [ 275.183973] CPU: 1 PID: 34 Comm: kworker/1:1 Tainted: G B 4.19.211-syzkaller #0 [ 275.192698] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 275.202039] Workqueue: events sco_sock_timeout [ 275.206598] Call Trace: [ 275.209171] dump_stack+0x1fc/0x2ef [ 275.212781] panic+0x26a/0x50e [ 275.215957] ? __warn_printk+0xf3/0xf3 [ 275.219833] ? lock_downgrade+0x720/0x720 [ 275.223964] ? print_shadow_for_address+0xb8/0x114 [ 275.228877] ? trace_hardirqs_off+0x64/0x200 [ 275.233270] kasan_end_report+0x43/0x49 [ 275.237230] kasan_report_error.cold+0xa7/0x1b9 [ 275.241881] ? __lock_acquire+0x2cb4/0x3ff0 [ 275.246201] __asan_report_load8_noabort+0x88/0x90 [ 275.251114] ? __lock_acquire+0x2cb4/0x3ff0 [ 275.255418] __lock_acquire+0x2cb4/0x3ff0 [ 275.259554] ? mark_held_locks+0xf0/0xf0 [ 275.263597] ? mark_held_locks+0xf0/0xf0 [ 275.267650] ? lock_acquire+0x170/0x3c0 [ 275.271608] ? trace_hardirqs_off+0x64/0x200 [ 275.276008] ? sco_sock_timeout+0x5d/0x1b0 [ 275.280227] lock_acquire+0x170/0x3c0 [ 275.284098] ? sco_sock_timeout+0x7b/0x1b0 [ 275.288322] _raw_spin_lock+0x2a/0x40 [ 275.292105] ? sco_sock_timeout+0x7b/0x1b0 [ 275.296323] sco_sock_timeout+0x7b/0x1b0 [ 275.300368] process_one_work+0x864/0x1570 [ 275.304586] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 275.309239] worker_thread+0x64c/0x1130 [ 275.313197] ? __kthread_parkme+0x133/0x1e0 [ 275.317500] ? process_one_work+0x1570/0x1570 [ 275.321974] kthread+0x33f/0x460 [ 275.325321] ? kthread_park+0x180/0x180 [ 275.329278] ret_from_fork+0x24/0x30 [ 275.333132] Kernel Offset: disabled [ 275.336754] Rebooting in 86400 seconds..