[ 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 '10.128.1.5' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 36.621480] BTRFS: device fsid 24c7a497-3402-47dd-bef8-82358f5f30e0 devid 1 transid 8 /dev/loop0 [ 36.637174] BTRFS info (device loop0): turning on flush-on-commit [ 36.643553] BTRFS info (device loop0): using free space tree [ 36.650595] BTRFS info (device loop0): has skinny extents [ 36.668490] BTRFS info (device loop0): checking UUID tree [ 36.678160] ------------[ cut here ]------------ [ 36.683156] WARNING: CPU: 1 PID: 8129 at fs/fs-writeback.c:2370 __writeback_inodes_sb_nr.cold+0x11/0x18 [ 36.692691] Kernel panic - not syncing: panic_on_warn set ... [ 36.692691] [ 36.700065] CPU: 1 PID: 8129 Comm: btrfs-transacti Not tainted 4.19.211-syzkaller #0 [ 36.707943] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 36.717296] Call Trace: [ 36.719894] dump_stack+0x1fc/0x2ef [ 36.723516] panic+0x26a/0x50e [ 36.726698] ? __warn_printk+0xf3/0xf3 [ 36.730568] ? __writeback_inodes_sb_nr.cold+0x11/0x18 [ 36.735823] ? __probe_kernel_read+0x130/0x1b0 [ 36.740380] ? __warn.cold+0x5/0x5a [ 36.743980] ? __warn+0xe4/0x200 [ 36.747325] ? __writeback_inodes_sb_nr.cold+0x11/0x18 [ 36.752576] __warn.cold+0x20/0x5a [ 36.756189] ? __writeback_inodes_sb_nr.cold+0x11/0x18 [ 36.761442] report_bug+0x262/0x2b0 [ 36.765050] do_error_trap+0x1d7/0x310 [ 36.768912] ? math_error+0x310/0x310 [ 36.772687] ? __irq_work_queue_local+0x101/0x160 [ 36.777508] ? irq_work_queue+0x29/0x80 [ 36.781456] ? error_entry+0x72/0xd0 [ 36.785145] ? trace_hardirqs_off_caller+0x6e/0x210 [ 36.790139] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.794958] invalid_op+0x14/0x20 [ 36.798387] RIP: 0010:__writeback_inodes_sb_nr.cold+0x11/0x18 [ 36.804249] Code: e1 e8 36 ba 6d f9 48 c7 c7 c0 f9 74 88 e8 95 eb fe ff 0f 0b e9 75 12 b9 f9 e8 1e ba 6d f9 48 c7 c7 c0 f9 74 88 e8 7d eb fe ff <0f> 0b e9 c9 34 b9 f9 e8 06 ba 6d f9 48 c7 c7 c0 f9 74 88 e8 65 eb [ 36.823136] RSP: 0018:ffff8880a1b8fc48 EFLAGS: 00010286 [ 36.828475] RAX: 0000000000000024 RBX: 1ffff11014371f8b RCX: 0000000000000000 [ 36.835723] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1014371f7b [ 36.843140] RBP: ffff8880b0594980 R08: 0000000000000024 R09: 0000000000000000 [ 36.850386] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000006400 [ 36.857642] R13: ffff888099dbf100 R14: ffff8880b0594ab0 R15: ffff8880a1b8fc88 [ 36.864899] ? vprintk_func+0x81/0x180 [ 36.868773] ? __writeback_inodes_sb_nr.cold+0x11/0x18 [ 36.874031] ? bdi_split_work_to_wbs+0xfa0/0xfa0 [ 36.878765] ? btrfs_commit_transaction+0x1dfa/0x2480 [ 36.883934] ? get_nr_dirty_inodes+0x19e/0x210 [ 36.888506] btrfs_commit_transaction+0x1bb1/0x2480 [ 36.893499] ? do_raw_spin_unlock+0x171/0x230 [ 36.897969] ? _raw_spin_unlock+0x29/0x40 [ 36.902095] ? btrfs_apply_pending_changes+0x150/0x150 [ 36.907353] ? btrfs_record_root_in_trans+0x13c/0x190 [ 36.912621] ? start_transaction+0x239/0xf90 [ 36.917017] transaction_kthread+0x385/0x490 [ 36.921402] ? __kthread_parkme+0x133/0x1e0 [ 36.925698] ? open_ctree+0x61e0/0x61e0 [ 36.929656] kthread+0x33f/0x460 [ 36.932997] ? kthread_park+0x180/0x180 [ 36.936953] ret_from_fork+0x24/0x30 [ 36.941079] Kernel Offset: disabled [ 36.944741] Rebooting in 86400 seconds..