Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.1.46' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   33.825989] BTRFS: device fsid f90cac8b-044b-4fa8-8bee-4b8d3da88dc2 devid 1 transid 7 /dev/loop0
[   33.841205] BTRFS info (device loop0): turning on flush-on-commit
[   33.850930] BTRFS info (device loop0): disk space caching is enabled
[   33.863760] BTRFS info (device loop0): has skinny extents
[   33.907145] ------------[ cut here ]------------
[   33.913174] WARNING: CPU: 1 PID: 8119 at fs/fs-writeback.c:2390 __writeback_inodes_sb_nr.cold+0x11/0x18
[   33.922706] Kernel panic - not syncing: panic_on_warn set ...
[   33.922706] 
[   33.930055] CPU: 1 PID: 8119 Comm: btrfs-transacti Not tainted 4.19.184-syzkaller #0
[   33.937912] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   33.947246] Call Trace:
[   33.949836]  dump_stack+0x1fc/0x2ef
[   33.953447]  panic+0x26a/0x50e
[   33.956643]  ? __warn_printk+0xf3/0xf3
[   33.960516]  ? __writeback_inodes_sb_nr.cold+0x11/0x18
[   33.965774]  ? __probe_kernel_read+0x130/0x1b0
[   33.970338]  ? __warn.cold+0x5/0x5a
[   33.973944]  ? __warn+0xe4/0x200
[   33.977291]  ? __writeback_inodes_sb_nr.cold+0x11/0x18
[   33.982549]  __warn.cold+0x20/0x5a
[   33.986071]  ? io_schedule_timeout+0x140/0x140
[   33.990650]  ? __writeback_inodes_sb_nr.cold+0x11/0x18
[   33.995912]  report_bug+0x262/0x2b0
[   33.999521]  do_error_trap+0x1d7/0x310
[   34.003407]  ? math_error+0x310/0x310
[   34.007191]  ? __irq_work_queue_local+0x101/0x160
[   34.012041]  ? irq_work_queue+0x29/0x80
[   34.015996]  ? error_entry+0x72/0xd0
[   34.019707]  ? trace_hardirqs_off_caller+0x6e/0x210
[   34.024706]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   34.029531]  invalid_op+0x14/0x20
[   34.032981] RIP: 0010:__writeback_inodes_sb_nr.cold+0x11/0x18
[   34.038846] Code: bb e8 9d 02 6f f9 48 c7 c7 a0 f3 74 88 e8 76 ea fe ff 0f 0b e9 6c 50 ba f9 e8 85 02 6f f9 48 c7 c7 a0 f3 74 88 e8 5e ea fe ff <0f> 0b e9 c0 72 ba f9 e8 6d 02 6f f9 48 c7 c7 a0 f3 74 88 e8 46 ea
[   34.057738] RSP: 0018:ffff88809ce67c48 EFLAGS: 00010286
[   34.063083] RAX: 0000000000000024 RBX: 1ffff110139ccf8b RCX: 0000000000000000
[   34.070335] RDX: 0000000000000000 RSI: ffffffff814ddd51 RDI: ffffed10139ccf7b
[   34.077590] RBP: ffff8880b0c8e300 R08: 0000000000000024 R09: 0000000000000000
[   34.084841] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000006400
[   34.092092] R13: ffff8880957ba480 R14: ffff8880b0c8e430 R15: ffff88809ce67c88
[   34.099365]  ? vprintk_func+0x81/0x180
[   34.103247]  ? __writeback_inodes_sb_nr.cold+0x11/0x18
[   34.108506]  ? bdi_split_work_to_wbs+0xfa0/0xfa0
[   34.113244]  ? btrfs_commit_transaction+0x1dfa/0x2480
[   34.118417]  ? get_nr_dirty_inodes+0x19e/0x210
[   34.122981]  btrfs_commit_transaction+0x1bb1/0x2480
[   34.128001]  ? do_raw_spin_unlock+0x171/0x230
[   34.132497]  ? _raw_spin_unlock+0x29/0x40
[   34.136636]  ? btrfs_apply_pending_changes+0x150/0x150
[   34.142123]  ? btrfs_record_root_in_trans+0x13c/0x190
[   34.147299]  ? start_transaction+0x239/0xf90
[   34.151696]  transaction_kthread+0x385/0x490
[   34.156114]  ? __kthread_parkme+0x133/0x1e0
[   34.160432]  ? open_ctree+0x61e0/0x61e0
[   34.164701]  kthread+0x33f/0x460
[   34.168066]  ? kthread_park+0x180/0x180
[   34.172053]  ret_from_fork+0x24/0x30
[   34.176677] Kernel Offset: disabled
[   34.180661] Rebooting in 86400 seconds..