[ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ 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. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.222' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 30.295387] BTRFS: device fsid c60cf190-3c65-4298-abf6-b290b3ceb27d devid 0 transid 7 /dev/loop0 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 30.570194] BTRFS: device fsid c60cf190-3c65-4298-abf6-b290b3ceb27d devid 1 transid 7 /dev/loop4 [ 30.596311] BTRFS info (device loop4): disk space caching is enabled executing program executing program [ 30.621601] BTRFS info (device loop4): has skinny extents executing program executing program executing program executing program [ 30.696106] BTRFS error (device loop4): bad tree block start 0 30441472 [ 30.706502] BTRFS info (device loop4): read error corrected: ino 0 off 30441472 (dev /dev/loop5 sector 75840) [ 30.717855] BTRFS info (device loop4): read error corrected: ino 0 off 30445568 (dev /dev/loop5 sector 75848) [ 30.728800] BTRFS info (device loop4): read error corrected: ino 0 off 30449664 (dev /dev/loop5 sector 75856) executing program executing program executing program executing program executing program [ 30.779381] BTRFS info (device loop4): read error corrected: ino 0 off 30453760 (dev /dev/loop5 sector 75864) [ 30.808476] BTRFS error (device loop4): bad tree block start 0 30490624 [ 30.820580] BTRFS error (device loop4): bad tree block start 0 30490624 executing program executing program executing program executing program [ 30.832052] BTRFS warning (device loop4): failed to recover relocation: -5 executing program executing program [ 30.904110] BTRFS error (device loop4): open_ctree failed [ 30.915434] BTRFS info (device loop4): disk space caching is enabled executing program [ 30.955379] BTRFS info (device loop4): has skinny extents executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.117147] BTRFS error (device loop4): bad tree block start 0 30490624 [ 31.126390] BTRFS error (device loop4): bad tree block start 0 30490624 [ 31.133905] BTRFS warning (device loop4): failed to recover relocation: -5 executing program executing program executing program executing program [ 31.203028] BTRFS error (device loop4): open_ctree failed [ 31.211744] BTRFS info (device loop4): disk space caching is enabled [ 31.219242] BTRFS info (device loop4): has skinny extents executing program executing program executing program [ 31.291882] BTRFS error (device loop4): bad tree block start 0 30490624 [ 31.319161] BTRFS error (device loop4): bad tree block start 0 30490624 [ 31.327253] BTRFS warning (device loop4): failed to recover relocation: -5 executing program executing program executing program executing program [ 31.372803] BTRFS error (device loop4): open_ctree failed [ 31.383622] BTRFS info (device loop4): disk space caching is enabled [ 31.390163] BTRFS info (device loop4): has skinny extents executing program executing program executing program executing program executing program [ 31.481302] BTRFS error (device loop4): bad tree block start 0 30490624 [ 31.488827] BTRFS error (device loop4): bad tree block start 0 30490624 [ 31.496705] BTRFS warning (device loop4): failed to recover relocation: -5 executing program executing program [ 31.542711] BTRFS error (device loop4): open_ctree failed [ 31.550431] BTRFS info (device loop4): disk space caching is enabled [ 31.557253] BTRFS info (device loop4): has skinny extents executing program executing program executing program [ 31.667493] BTRFS error (device loop4): bad tree block start 0 30490624 [ 31.680502] BTRFS warning (device loop4): failed to recover relocation: -5 executing program executing program executing program executing program executing program executing program executing program [ 31.822943] ------------[ cut here ]------------ [ 31.827821] WARNING: CPU: 0 PID: 8089 at fs/btrfs/volumes.c:936 __btrfs_close_devices+0x888/0xb20 [ 31.836826] Kernel panic - not syncing: panic_on_warn set ... [ 31.836826] [ 31.844205] CPU: 0 PID: 8089 Comm: syz-executor014 Not tainted 4.14.218-syzkaller #0 [ 31.852084] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.861437] Call Trace: [ 31.864034] dump_stack+0x1b2/0x281 [ 31.867672] panic+0x1f9/0x42d executing program executing program [ 31.870869] ? add_taint.cold+0x16/0x16 [ 31.874847] ? __btrfs_close_devices+0x888/0xb20 [ 31.879608] ? __btrfs_close_devices+0x888/0xb20 [ 31.884366] __warn.cold+0x20/0x44 [ 31.887905] ? ist_end_non_atomic+0x10/0x10 [ 31.892228] ? __btrfs_close_devices+0x888/0xb20 [ 31.896984] report_bug+0x208/0x250 [ 31.900613] do_error_trap+0x195/0x2d0 [ 31.904504] ? math_error+0x2d0/0x2d0 [ 31.908330] ? trace_hardirqs_on_caller+0x3a8/0x580 [ 31.913348] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 31.918451] ? debug_object_active_state+0x236/0x330 executing program executing program executing program executing program [ 31.923558] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.928405] invalid_op+0x1b/0x40 [ 31.931859] RIP: 0010:__btrfs_close_devices+0x888/0xb20 [ 31.937226] RSP: 0018:ffff888096fd7618 EFLAGS: 00010297 [ 31.942584] RAX: ffff8880b31d8140 RBX: dffffc0000000000 RCX: ffff888096fd7688 [ 31.950388] RDX: 0000000000000000 RSI: ffff8880b31d89f0 RDI: ffff8880a1fdc560 [ 31.957667] RBP: ffff8880b6104040 R08: 0000000000000282 R09: 0000000000000000 [ 31.964929] R10: 0000000000000000 R11: 0000000000000000 R12: dead000000000200 executing program executing program executing program executing program [ 31.972198] R13: dead000000000100 R14: ffff88808fea0340 R15: ffff8880b61040e0 [ 31.979491] ? __btrfs_close_devices+0x888/0xb20 [ 31.984257] ? btrfs_alloc_device+0x580/0x580 [ 31.988761] btrfs_close_devices+0x24/0x140 [ 31.993086] open_ctree+0x241/0x7400 [ 31.996840] ? close_ctree+0x840/0x840 [ 32.000741] ? dlm_unlock_lock_handler+0x8d0/0x8d0 [ 32.005680] btrfs_mount+0x1915/0x1fe0 [ 32.009581] ? btrfs_get_subvol_name_from_objectid+0x8c0/0x8c0 [ 32.015566] ? rcu_lockdep_current_cpu_online+0xed/0x140 executing program executing program executing program executing program executing program executing program executing program [ 32.021048] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 32.026057] ? __lockdep_init_map+0x100/0x560 [ 32.030543] ? __lockdep_init_map+0x100/0x560 [ 32.035047] mount_fs+0x92/0x2a0 [ 32.038415] vfs_kern_mount.part.0+0x5b/0x470 [ 32.042953] vfs_kern_mount+0x3c/0x60 [ 32.046748] btrfs_mount+0x42a/0x1fe0 [ 32.050585] ? lock_downgrade+0x740/0x740 [ 32.054727] ? _find_next_bit+0xdb/0x100 [ 32.058790] ? btrfs_get_subvol_name_from_objectid+0x8c0/0x8c0 [ 32.064770] ? rcu_lockdep_current_cpu_online+0xed/0x140 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 32.070222] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 32.075233] ? __lockdep_init_map+0x100/0x560 [ 32.079729] ? __lockdep_init_map+0x100/0x560 [ 32.084246] mount_fs+0x92/0x2a0 [ 32.087619] vfs_kern_mount.part.0+0x5b/0x470 [ 32.092123] do_mount+0xe53/0x2a00 [ 32.095673] ? copy_mount_string+0x40/0x40 [ 32.099909] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 32.104923] ? copy_mnt_ns+0xa30/0xa30 [ 32.108811] ? copy_mount_options+0x1fa/0x2f0 [ 32.113301] ? copy_mnt_ns+0xa30/0xa30 [ 32.117191] SyS_mount+0xa8/0x120 [ 32.120641] ? copy_mnt_ns+0xa30/0xa30 executing program executing program executing program executing program executing program executing program executing program [ 32.124536] do_syscall_64+0x1d5/0x640 [ 32.128427] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 32.133613] RIP: 0033:0x44790a [ 32.136799] RSP: 002b:00007ffe069674f8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 [ 32.144506] RAX: ffffffffffffffda RBX: 00007ffe06967590 RCX: 000000000044790a [ 32.151775] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffe06967550 [ 32.159147] RBP: 00007ffe06967550 R08: 00007ffe06967590 R09: 0000000000000000 [ 32.166407] R10: 0000000000000000 R11: 0000000000000282 R12: 0000000000000059 [ 32.173679] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000020000100 [ 32.181890] Kernel Offset: disabled [ 32.185562] Rebooting in 86400 seconds..