[ 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 '10.128.1.17' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 33.418785] BTRFS: device fsid 24c7a497-3402-47dd-bef8-82358f5f30e0 devid 1 transid 8 /dev/loop0 [ 33.433859] BTRFS info (device loop0): turning on flush-on-commit [ 33.440719] BTRFS info (device loop0): trying to use backup root at mount time [ 33.448435] BTRFS info (device loop0): setting nodatasum [ 33.454078] BTRFS info (device loop0): using free space tree [ 33.460351] BTRFS info (device loop0): has skinny extents [ 33.473766] BTRFS warning (device loop0): loop0 checksum verify failed on 5332992 wanted A976C57C found 955E4C5E level 0 [ 33.485187] BTRFS warning (device loop0): failed to read tree root [ 33.491980] BTRFS warning (device loop0): loop0 checksum verify failed on 5332992 wanted A976C57C found 955E4C5E level 0 [ 33.505619] BTRFS warning (device loop0): failed to read tree root [ 33.522558] BTRFS info (device loop0): clearing free space tree [ 33.528957] BTRFS info (device loop0): clearing 1 ro feature flag [ 33.536303] BTRFS info (device loop0): clearing 2 ro feature flag [ 33.548358] BTRFS info (device loop0): creating free space tree [ 33.555041] BTRFS info (device loop0): setting 1 ro feature flag [ 33.561707] BTRFS info (device loop0): setting 2 ro feature flag executing program [ 33.571164] BTRFS info (device loop0): checking UUID tree [ 33.583572] ------------[ cut here ]------------ [ 33.589539] WARNING: CPU: 0 PID: 8132 at fs/fs-writeback.c:2370 __writeback_inodes_sb_nr.cold+0x11/0x18 [ 33.599080] Kernel panic - not syncing: panic_on_warn set ... [ 33.599080] [ 33.606445] CPU: 0 PID: 8132 Comm: btrfs-transacti Not tainted 4.19.211-syzkaller #0 [ 33.614326] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 33.623679] Call Trace: [ 33.626457] dump_stack+0x1fc/0x2ef [ 33.630095] panic+0x26a/0x50e [ 33.633295] ? __warn_printk+0xf3/0xf3 [ 33.637191] ? __writeback_inodes_sb_nr.cold+0x11/0x18 [ 33.642478] ? __probe_kernel_read+0x130/0x1b0 [ 33.647070] ? __warn.cold+0x5/0x5a [ 33.650706] ? __warn+0xe4/0x200 [ 33.654084] ? __writeback_inodes_sb_nr.cold+0x11/0x18 [ 33.659371] __warn.cold+0x20/0x5a [ 33.662920] ? io_schedule_timeout+0x140/0x140 [ 33.667684] ? __writeback_inodes_sb_nr.cold+0x11/0x18 [ 33.672978] report_bug+0x262/0x2b0 [ 33.676619] do_error_trap+0x1d7/0x310 [ 33.680514] ? math_error+0x310/0x310 [ 33.684317] ? __irq_work_queue_local+0x101/0x160 [ 33.689168] ? irq_work_queue+0x29/0x80 [ 33.693150] ? error_entry+0x72/0xd0 [ 33.696875] ? trace_hardirqs_off_caller+0x6e/0x210 [ 33.701901] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.706752] invalid_op+0x14/0x20 [ 33.710214] RIP: 0010:__writeback_inodes_sb_nr.cold+0x11/0x18 [ 33.716101] 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 [ 33.735005] RSP: 0018:ffff888095777c48 EFLAGS: 00010286 [ 33.740458] RAX: 0000000000000024 RBX: 1ffff11012aeef8b RCX: 0000000000000000 [ 33.747729] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1012aeef7b [ 33.754999] RBP: ffff8880b1548e40 R08: 0000000000000024 R09: 0000000000000000 [ 33.762270] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000006400 [ 33.769630] R13: ffff8880b2af6bc0 R14: ffff8880b1548f70 R15: ffff888095777c88 [ 33.776913] ? vprintk_func+0x81/0x180 [ 33.780819] ? __writeback_inodes_sb_nr.cold+0x11/0x18 [ 33.786125] ? bdi_split_work_to_wbs+0xfa0/0xfa0 [ 33.790887] ? btrfs_commit_transaction+0x1dfa/0x2480 [ 33.796091] ? get_nr_dirty_inodes+0x19e/0x210 [ 33.800675] btrfs_commit_transaction+0x1bb1/0x2480 [ 33.805675] ? do_raw_spin_unlock+0x171/0x230 [ 33.810159] ? _raw_spin_unlock+0x29/0x40 [ 33.814288] ? btrfs_apply_pending_changes+0x150/0x150 [ 33.819543] ? btrfs_record_root_in_trans+0x13c/0x190 [ 33.824715] ? start_transaction+0x239/0xf90 [ 33.829106] transaction_kthread+0x385/0x490 [ 33.833498] ? __kthread_parkme+0x133/0x1e0 [ 33.837796] ? open_ctree+0x61e0/0x61e0 [ 33.841752] kthread+0x33f/0x460 [ 33.845097] ? kthread_park+0x180/0x180 [ 33.849063] ret_from_fork+0x24/0x30 [ 33.853153] Kernel Offset: disabled [ 33.856812] Rebooting in 86400 seconds..