[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.155' (ECDSA) to the list of known hosts. syzkaller login: [ 1104.947633] 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 [ 1106.984940] 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 [ 1109.064603] 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 [ 1111.144062] 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 [ 1113.223809] 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 [ 1115.303693] 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 [ 1117.383329] 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 [ 1149.780340] ================================================================== [ 1149.787730] BUG: KASAN: use-after-free in __lock_acquire+0x2c57/0x3f20 [ 1149.794370] Read of size 8 at addr ffff8880b0af8d60 by task kworker/0:0/7978 [ 1149.801523] [ 1149.803130] CPU: 0 PID: 7978 Comm: kworker/0:0 Not tainted 4.14.280-syzkaller #0 [ 1149.810635] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1149.819977] Workqueue: events sco_sock_timeout [ 1149.824541] Call Trace: [ 1149.827106] dump_stack+0x1b2/0x281 [ 1149.830712] print_address_description.cold+0x54/0x1d3 [ 1149.835960] kasan_report_error.cold+0x8a/0x191 [ 1149.840606] ? __lock_acquire+0x2c57/0x3f20 [ 1149.844907] __asan_report_load8_noabort+0x68/0x70 [ 1149.849816] ? __lock_acquire+0x2c57/0x3f20 [ 1149.854115] __lock_acquire+0x2c57/0x3f20 [ 1149.858234] ? trace_hardirqs_on+0x10/0x10 [ 1149.862441] ? debug_object_deactivate+0x1da/0x2e0 [ 1149.867340] ? trace_hardirqs_on+0x10/0x10 [ 1149.871547] ? sco_sock_timeout+0x5d/0x1a0 [ 1149.875871] lock_acquire+0x170/0x3f0 [ 1149.879643] ? sco_sock_timeout+0x7b/0x1a0 [ 1149.883858] _raw_spin_lock+0x2a/0x40 [ 1149.887637] ? sco_sock_timeout+0x7b/0x1a0 [ 1149.891856] sco_sock_timeout+0x7b/0x1a0 [ 1149.895888] process_one_work+0x793/0x14a0 [ 1149.900095] ? work_busy+0x320/0x320 [ 1149.903779] ? worker_thread+0x158/0xff0 [ 1149.907824] ? _raw_spin_unlock_irq+0x24/0x80 [ 1149.912292] worker_thread+0x5cc/0xff0 [ 1149.916585] ? rescuer_thread+0xc80/0xc80 [ 1149.920715] kthread+0x30d/0x420 [ 1149.924056] ? kthread_create_on_node+0xd0/0xd0 [ 1149.928699] ret_from_fork+0x24/0x30 [ 1149.932382] [ 1149.933985] Allocated by task 8136: [ 1149.937672] kasan_kmalloc+0xeb/0x160 [ 1149.941443] __kmalloc+0x15a/0x400 [ 1149.944964] sk_prot_alloc+0x1ba/0x290 [ 1149.948823] sk_alloc+0x36/0xcd0 [ 1149.952160] sco_sock_alloc.constprop.0+0x31/0x200 [ 1149.957061] sco_sock_create+0xc5/0x180 [ 1149.961007] bt_sock_create+0x13b/0x280 [ 1149.964951] __sock_create+0x303/0x620 [ 1149.968810] SyS_socket+0xd1/0x1b0 [ 1149.972321] do_syscall_64+0x1d5/0x640 [ 1149.976178] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1149.981333] [ 1149.982930] Freed by task 8137: [ 1149.986183] kasan_slab_free+0xc3/0x1a0 [ 1149.990130] kfree+0xc9/0x250 [ 1149.993213] __sk_destruct+0x5e3/0x760 [ 1149.997071] __sk_free+0xd9/0x2d0 [ 1150.000495] sk_free+0x2b/0x40 [ 1150.003660] sco_sock_kill.part.0+0x97/0xb0 [ 1150.007955] sco_sock_release+0x17d/0x2f0 [ 1150.012092] __sock_release+0xcd/0x2b0 [ 1150.015948] sock_close+0x15/0x20 [ 1150.019376] __fput+0x25f/0x7a0 [ 1150.022627] task_work_run+0x11f/0x190 [ 1150.026488] get_signal+0x18a3/0x1ca0 [ 1150.030263] do_signal+0x7c/0x1550 [ 1150.033789] exit_to_usermode_loop+0x160/0x200 [ 1150.038340] do_syscall_64+0x4a3/0x640 [ 1150.042200] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1150.047356] [ 1150.048986] The buggy address belongs to the object at ffff8880b0af8cc0 [ 1150.048986] which belongs to the cache kmalloc-2048 of size 2048 [ 1150.061794] The buggy address is located 160 bytes inside of [ 1150.061794] 2048-byte region [ffff8880b0af8cc0, ffff8880b0af94c0) [ 1150.073730] The buggy address belongs to the page: [ 1150.078639] page:ffffea0002c2be00 count:1 mapcount:0 mapping:ffff8880b0af8440 index:0x0 compound_mapcount: 0 [ 1150.088601] flags: 0xfff00000008100(slab|head) [ 1150.093157] raw: 00fff00000008100 ffff8880b0af8440 0000000000000000 0000000100000003 [ 1150.101013] raw: ffffea00024f96a0 ffffea0002c184a0 ffff88813fe74c40 0000000000000000 [ 1150.108865] page dumped because: kasan: bad access detected [ 1150.114544] [ 1150.116144] Memory state around the buggy address: [ 1150.121048] ffff8880b0af8c00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 1150.128379] ffff8880b0af8c80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 1150.135711] >ffff8880b0af8d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1150.143037] ^ [ 1150.149501] ffff8880b0af8d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1150.156844] ffff8880b0af8e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1150.164177] ================================================================== [ 1150.171515] Disabling lock debugging due to kernel taint [ 1150.177063] Kernel panic - not syncing: panic_on_warn set ... [ 1150.177063] [ 1150.184409] CPU: 0 PID: 7978 Comm: kworker/0:0 Tainted: G B 4.14.280-syzkaller #0 [ 1150.193136] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1150.202564] Workqueue: events sco_sock_timeout [ 1150.207118] Call Trace: [ 1150.209684] dump_stack+0x1b2/0x281 [ 1150.213488] panic+0x1f9/0x42d [ 1150.216658] ? add_taint.cold+0x16/0x16 [ 1150.220608] ? lock_downgrade+0x740/0x740 [ 1150.224747] kasan_end_report+0x43/0x49 [ 1150.228696] kasan_report_error.cold+0xa7/0x191 [ 1150.233349] ? __lock_acquire+0x2c57/0x3f20 [ 1150.237644] __asan_report_load8_noabort+0x68/0x70 [ 1150.242548] ? __lock_acquire+0x2c57/0x3f20 [ 1150.246842] __lock_acquire+0x2c57/0x3f20 [ 1150.250964] ? trace_hardirqs_on+0x10/0x10 [ 1150.255176] ? debug_object_deactivate+0x1da/0x2e0 [ 1150.260074] ? trace_hardirqs_on+0x10/0x10 [ 1150.264280] ? sco_sock_timeout+0x5d/0x1a0 [ 1150.268494] lock_acquire+0x170/0x3f0 [ 1150.272264] ? sco_sock_timeout+0x7b/0x1a0 [ 1150.276471] _raw_spin_lock+0x2a/0x40 [ 1150.280241] ? sco_sock_timeout+0x7b/0x1a0 [ 1150.284450] sco_sock_timeout+0x7b/0x1a0 [ 1150.288484] process_one_work+0x793/0x14a0 [ 1150.292693] ? work_busy+0x320/0x320 [ 1150.296378] ? worker_thread+0x158/0xff0 [ 1150.300412] ? _raw_spin_unlock_irq+0x24/0x80 [ 1150.304976] worker_thread+0x5cc/0xff0 [ 1150.308836] ? rescuer_thread+0xc80/0xc80 [ 1150.312959] kthread+0x30d/0x420 [ 1150.316301] ? kthread_create_on_node+0xd0/0xd0 [ 1150.320961] ret_from_fork+0x24/0x30 [ 1150.324725] Kernel Offset: disabled [ 1150.328328] Rebooting in 86400 seconds..