[ OK ] Reached target Multi-User System. [ 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... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts. syzkaller login: [ 615.285048][ T6849] IPVS: ftp: loaded support on port[0] = 21 [ 615.285069][ T6850] IPVS: ftp: loaded support on port[0] = 21 [ 615.298224][ T6848] IPVS: ftp: loaded support on port[0] = 21 [ 615.373388][ T6844] IPVS: ftp: loaded support on port[0] = 21 [ 615.385410][ T6851] IPVS: ftp: loaded support on port[0] = 21 [ 615.417280][ T6852] 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 [ 617.283401][ T12] Bluetooth: hci5: command 0x0409 tx timeout [ 617.283409][ T17] Bluetooth: hci2: command 0x0409 tx timeout [ 617.283842][ T12] Bluetooth: hci4: command 0x0409 tx timeout [ 617.292021][ T17] Bluetooth: hci1: command 0x0409 tx timeout [ 617.322775][ T12] Bluetooth: hci3: command 0x0409 tx timeout executing program [ 617.363031][ T17] 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 [ 619.362684][ T17] Bluetooth: hci3: command 0x041b tx timeout [ 619.370015][ T17] Bluetooth: hci4: command 0x041b tx timeout [ 619.373085][ T12] Bluetooth: hci2: command 0x041b tx timeout [ 619.382270][ T12] Bluetooth: hci5: command 0x041b tx timeout [ 619.442706][ T17] Bluetooth: hci0: command 0x041b tx timeout [ 619.451117][ T17] Bluetooth: hci1: 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 [ 621.442911][ T17] Bluetooth: hci4: command 0x040f tx timeout [ 621.449183][ T17] Bluetooth: hci5: command 0x040f tx timeout [ 621.470921][ T17] Bluetooth: hci2: command 0x040f tx timeout [ 621.497252][ T17] Bluetooth: hci3: command 0x040f tx timeout [ 621.524731][ T17] Bluetooth: hci1: command 0x040f tx timeout [ 621.552404][ T17] 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 [ 623.522712][ T17] Bluetooth: hci2: command 0x0419 tx timeout [ 623.531072][ T17] Bluetooth: hci5: command 0x0419 tx timeout [ 623.559337][ T17] Bluetooth: hci4: command 0x0419 tx timeout executing program [ 623.602819][ T17] Bluetooth: hci0: command 0x0419 tx timeout [ 623.623827][ T17] Bluetooth: hci1: command 0x0419 tx timeout executing program [ 623.652757][ T17] Bluetooth: hci3: command 0x0419 tx timeout executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 625.602956][ T17] Bluetooth: hci5: 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 [ 660.563604][ T7317] ================================================================== [ 660.572844][ T7317] BUG: KASAN: use-after-free in __lock_acquire+0x41d0/0x5640 [ 660.580521][ T7317] Read of size 8 at addr ffff8880a285a0a0 by task kworker/0:0/7317 [ 660.589315][ T7317] [ 660.591756][ T7317] CPU: 0 PID: 7317 Comm: kworker/0:0 Not tainted 5.8.0-syzkaller #0 [ 660.601740][ T7317] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 660.612203][ T7317] Workqueue: events l2cap_chan_timeout [ 660.617820][ T7317] Call Trace: [ 660.622146][ T7317] dump_stack+0x18f/0x20d [ 660.626495][ T7317] ? __lock_acquire+0x41d0/0x5640 [ 660.631834][ T7317] ? __lock_acquire+0x41d0/0x5640 [ 660.636973][ T7317] print_address_description.constprop.0.cold+0xae/0x497 [ 660.644725][ T7317] ? check_path+0x22/0x40 [ 660.649167][ T7317] ? vprintk_func+0x97/0x1a6 [ 660.653801][ T7317] ? __lock_acquire+0x41d0/0x5640 [ 660.658835][ T7317] ? __lock_acquire+0x41d0/0x5640 [ 660.663888][ T7317] kasan_report.cold+0x1f/0x37 [ 660.668767][ T7317] ? debug_object_assert_init+0x240/0x2e0 [ 660.674967][ T7317] ? __lock_acquire+0x41d0/0x5640 [ 660.680458][ T7317] __lock_acquire+0x41d0/0x5640 [ 660.685889][ T7317] ? lockdep_hardirqs_off+0x89/0xc0 [ 660.691146][ T7317] ? trace_hardirqs_off+0x27/0x210 [ 660.697878][ T7317] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 660.708467][ T7317] ? debug_object_assert_init+0x246/0x2e0 [ 660.714555][ T7317] ? debug_object_init_on_stack+0x20/0x20 [ 660.720298][ T7317] lock_acquire+0x1f1/0xad0 [ 660.725001][ T7317] ? lock_sock_nested+0x3b/0x110 [ 660.730663][ T7317] ? lock_release+0x8e0/0x8e0 [ 660.735389][ T7317] ? mark_held_locks+0x9f/0xe0 [ 660.740189][ T7317] ? lock_is_held_type+0xbb/0xf0 [ 660.745662][ T7317] _raw_spin_lock_bh+0x2f/0x40 [ 660.751045][ T7317] ? lock_sock_nested+0x3b/0x110 [ 660.756091][ T7317] lock_sock_nested+0x3b/0x110 [ 660.761243][ T7317] l2cap_sock_teardown_cb+0x88/0x400 [ 660.766563][ T7317] l2cap_chan_del+0xad/0x1300 [ 660.771518][ T7317] l2cap_chan_close+0x118/0xb10 [ 660.776494][ T7317] ? lock_acquire+0x27b/0xad0 [ 660.782431][ T7317] ? l2cap_retransmit_all+0x760/0x760 [ 660.787995][ T7317] ? lock_release+0x8e0/0x8e0 [ 660.792878][ T7317] ? lock_downgrade+0x830/0x830 [ 660.802279][ T7317] ? __schedule+0x88e/0x21e0 [ 660.807365][ T7317] ? _raw_spin_unlock_irq+0x1f/0x80 [ 660.813727][ T7317] l2cap_chan_timeout+0x173/0x450 [ 660.819164][ T7317] process_one_work+0x94c/0x1670 [ 660.825347][ T7317] ? lock_release+0x8e0/0x8e0 [ 660.830068][ T7317] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 660.835628][ T7317] ? rwlock_bug.part.0+0x90/0x90 [ 660.840580][ T7317] worker_thread+0x64c/0x1120 [ 660.845393][ T7317] ? __kthread_parkme+0x13f/0x1e0 [ 660.850990][ T7317] ? process_one_work+0x1670/0x1670 [ 660.856765][ T7317] kthread+0x3b5/0x4a0 [ 660.860961][ T7317] ? __kthread_bind_mask+0xc0/0xc0 [ 660.866089][ T7317] ? __kthread_bind_mask+0xc0/0xc0 [ 660.871730][ T7317] ret_from_fork+0x1f/0x30 [ 660.876255][ T7317] [ 660.878673][ T7317] Allocated by task 8515: [ 660.883121][ T7317] kasan_save_stack+0x1b/0x40 [ 660.888480][ T7317] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 660.894496][ T7317] kmem_cache_alloc_trace+0x16e/0x2c0 [ 660.900404][ T7317] l2cap_chan_create+0x40/0x3a0 [ 660.906564][ T7317] l2cap_sock_alloc.constprop.0+0x185/0x230 [ 660.913165][ T7317] l2cap_sock_create+0x110/0x1b0 [ 660.918689][ T7317] bt_sock_create+0x154/0x2a0 [ 660.923708][ T7317] __sock_create+0x3ca/0x740 [ 660.928577][ T7317] __sys_socket+0xef/0x200 [ 660.933176][ T7317] __x64_sys_socket+0x6f/0xb0 [ 660.937855][ T7317] do_syscall_64+0x2d/0x70 [ 660.942283][ T7317] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 660.948279][ T7317] [ 660.950613][ T7317] Freed by task 8518: [ 660.954610][ T7317] kasan_save_stack+0x1b/0x40 [ 660.959301][ T7317] kasan_set_track+0x1c/0x30 [ 660.964048][ T7317] kasan_set_free_info+0x1b/0x30 [ 660.969011][ T7317] __kasan_slab_free+0xd8/0x120 [ 660.973901][ T7317] kfree+0x103/0x2c0 [ 660.977808][ T7317] l2cap_chan_put+0x1b2/0x230 [ 660.982583][ T7317] l2cap_sock_release+0x181/0x1d0 [ 660.987712][ T7317] __sock_release+0xcd/0x280 [ 660.992777][ T7317] sock_close+0x18/0x20 [ 660.997062][ T7317] __fput+0x285/0x920 [ 661.001828][ T7317] task_work_run+0xdd/0x190 [ 661.006441][ T7317] get_signal+0xd6c/0x1ee0 [ 661.011001][ T7317] arch_do_signal+0x82/0x2520 [ 661.015772][ T7317] exit_to_user_mode_prepare+0x15d/0x1c0 [ 661.021450][ T7317] syscall_exit_to_user_mode+0x59/0x2b0 [ 661.027025][ T7317] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 661.032912][ T7317] [ 661.035266][ T7317] The buggy address belongs to the object at ffff8880a285a000 [ 661.035266][ T7317] which belongs to the cache kmalloc-2k of size 2048 [ 661.049843][ T7317] The buggy address is located 160 bytes inside of [ 661.049843][ T7317] 2048-byte region [ffff8880a285a000, ffff8880a285a800) [ 661.063195][ T7317] The buggy address belongs to the page: [ 661.069278][ T7317] page:00000000a543b656 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa285a [ 661.079540][ T7317] flags: 0xfffe0000000200(slab) [ 661.084436][ T7317] raw: 00fffe0000000200 ffffea00024272c8 ffffea00029b9508 ffff8880aa040800 [ 661.093402][ T7317] raw: 0000000000000000 ffff8880a285a000 0000000100000001 0000000000000000 [ 661.102155][ T7317] page dumped because: kasan: bad access detected [ 661.108838][ T7317] [ 661.111159][ T7317] Memory state around the buggy address: [ 661.116874][ T7317] ffff8880a2859f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 661.124967][ T7317] ffff8880a285a000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 661.133062][ T7317] >ffff8880a285a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 661.141140][ T7317] ^ [ 661.146648][ T7317] ffff8880a285a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 661.154835][ T7317] ffff8880a285a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 661.162914][ T7317] ================================================================== [ 661.170970][ T7317] Disabling lock debugging due to kernel taint [ 661.177119][ T7317] Kernel panic - not syncing: panic_on_warn set ... [ 661.183970][ T7317] CPU: 0 PID: 7317 Comm: kworker/0:0 Tainted: G B 5.8.0-syzkaller #0 [ 661.193329][ T7317] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 661.203395][ T7317] Workqueue: events l2cap_chan_timeout [ 661.208864][ T7317] Call Trace: [ 661.212257][ T7317] dump_stack+0x18f/0x20d [ 661.216609][ T7317] ? __lock_acquire+0x4140/0x5640 [ 661.221738][ T7317] panic+0x2e3/0x75c [ 661.225635][ T7317] ? __warn_printk+0xf3/0xf3 [ 661.230234][ T7317] ? _raw_spin_unlock_irqrestore+0x5b/0xe0 [ 661.236046][ T7317] ? __lock_acquire+0x41d0/0x5640 [ 661.241102][ T7317] ? __lock_acquire+0x41d0/0x5640 [ 661.246122][ T7317] end_report+0x4d/0x53 [ 661.250282][ T7317] kasan_report.cold+0xd/0x37 [ 661.254961][ T7317] ? debug_object_assert_init+0x240/0x2e0 [ 661.261636][ T7317] ? __lock_acquire+0x41d0/0x5640 executing program [ 661.266662][ T7317] __lock_acquire+0x41d0/0x5640 [ 661.271520][ T7317] ? lockdep_hardirqs_off+0x89/0xc0 [ 661.276716][ T7317] ? trace_hardirqs_off+0x27/0x210 [ 661.281842][ T7317] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 661.287830][ T7317] ? debug_object_assert_init+0x246/0x2e0 [ 661.293550][ T7317] ? debug_object_init_on_stack+0x20/0x20 [ 661.299278][ T7317] lock_acquire+0x1f1/0xad0 [ 661.303787][ T7317] ? lock_sock_nested+0x3b/0x110 [ 661.308726][ T7317] ? lock_release+0x8e0/0x8e0 [ 661.313400][ T7317] ? mark_held_locks+0x9f/0xe0 [ 661.318186][ T7317] ? lock_is_held_type+0xbb/0xf0 [ 661.323126][ T7317] _raw_spin_lock_bh+0x2f/0x40 [ 661.327884][ T7317] ? lock_sock_nested+0x3b/0x110 [ 661.332819][ T7317] lock_sock_nested+0x3b/0x110 [ 661.337612][ T7317] l2cap_sock_teardown_cb+0x88/0x400 [ 661.342894][ T7317] l2cap_chan_del+0xad/0x1300 [ 661.347587][ T7317] l2cap_chan_close+0x118/0xb10 [ 661.352441][ T7317] ? lock_acquire+0x27b/0xad0 [ 661.357119][ T7317] ? l2cap_retransmit_all+0x760/0x760 [ 661.362489][ T7317] ? lock_release+0x8e0/0x8e0 [ 661.367164][ T7317] ? lock_downgrade+0x830/0x830 [ 661.372037][ T7317] ? __schedule+0x88e/0x21e0 [ 661.376624][ T7317] ? _raw_spin_unlock_irq+0x1f/0x80 [ 661.381822][ T7317] l2cap_chan_timeout+0x173/0x450 [ 661.386868][ T7317] process_one_work+0x94c/0x1670 [ 661.391808][ T7317] ? lock_release+0x8e0/0x8e0 [ 661.396480][ T7317] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 661.401853][ T7317] ? rwlock_bug.part.0+0x90/0x90 [ 661.406797][ T7317] worker_thread+0x64c/0x1120 [ 661.411476][ T7317] ? __kthread_parkme+0x13f/0x1e0 [ 661.416502][ T7317] ? process_one_work+0x1670/0x1670 [ 661.421704][ T7317] kthread+0x3b5/0x4a0 [ 661.425784][ T7317] ? __kthread_bind_mask+0xc0/0xc0 [ 661.430894][ T7317] ? __kthread_bind_mask+0xc0/0xc0 [ 661.436007][ T7317] ret_from_fork+0x1f/0x30 [ 661.441568][ T7317] Kernel Offset: disabled [ 661.446033][ T7317] Rebooting in 86400 seconds..