Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.53' (ECDSA) to the list of known hosts. syzkaller login: [ 35.280306] IPVS: ftp: loaded support on port[0] = 21 [ 35.334676] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready [ 35.352482] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 35.359805] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 35.369722] IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready executing program [ 35.383935] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 35.391983] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 35.392560] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 35.407893] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready [ 35.434404] BTRFS: device fsid f90cac8b-044b-4fa8-8bee-4b8d3da88dc2 devid 1 transid 7 /dev/loop0 [ 35.458180] BTRFS info (device loop0): turning on flush-on-commit [ 35.465137] BTRFS info (device loop0): disk space caching is enabled [ 35.473401] BTRFS info (device loop0): has skinny extents [ 35.518936] ------------[ cut here ]------------ [ 35.524111] WARNING: CPU: 1 PID: 8151 at fs/fs-writeback.c:2390 __writeback_inodes_sb_nr.cold+0x11/0x18 [ 35.533756] Kernel panic - not syncing: panic_on_warn set ... [ 35.533756] [ 35.541141] CPU: 1 PID: 8151 Comm: btrfs-transacti Not tainted 4.19.190-syzkaller #0 [ 35.549027] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.558392] Call Trace: [ 35.560970] dump_stack+0x1fc/0x2ef [ 35.564585] panic+0x26a/0x50e [ 35.567762] ? __warn_printk+0xf3/0xf3 [ 35.571648] ? __writeback_inodes_sb_nr.cold+0x11/0x18 [ 35.576908] ? __probe_kernel_read+0x130/0x1b0 [ 35.581474] ? __warn.cold+0x5/0x5a [ 35.585093] ? __warn+0xe4/0x200 [ 35.588454] ? __writeback_inodes_sb_nr.cold+0x11/0x18 [ 35.593719] __warn.cold+0x20/0x5a [ 35.597254] ? io_schedule_timeout+0x140/0x140 [ 35.601838] ? __writeback_inodes_sb_nr.cold+0x11/0x18 [ 35.607160] report_bug+0x262/0x2b0 [ 35.610781] do_error_trap+0x1d7/0x310 [ 35.614656] ? math_error+0x310/0x310 [ 35.618469] ? __irq_work_queue_local+0x101/0x160 [ 35.623300] ? irq_work_queue+0x29/0x80 [ 35.627267] ? error_entry+0x72/0xd0 [ 35.630968] ? trace_hardirqs_off_caller+0x6e/0x210 [ 35.635972] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.640810] invalid_op+0x14/0x20 [ 35.644255] RIP: 0010:__writeback_inodes_sb_nr.cold+0x11/0x18 [ 35.650181] Code: bb e8 5d e2 6e f9 48 c7 c7 e0 f3 74 88 e8 76 ea fe ff 0f 0b e9 ac 33 ba f9 e8 45 e2 6e f9 48 c7 c7 e0 f3 74 88 e8 5e ea fe ff <0f> 0b e9 00 56 ba f9 e8 2d e2 6e f9 48 c7 c7 e0 f3 74 88 e8 46 ea [ 35.669088] RSP: 0018:ffff88808bd5fc48 EFLAGS: 00010286 [ 35.674502] RAX: 0000000000000024 RBX: 1ffff110117abf8b RCX: 0000000000000000 [ 35.681762] RDX: 0000000000000000 RSI: ffffffff814dde61 RDI: ffffed10117abf7b [ 35.689085] RBP: ffff8880b257c680 R08: 0000000000000024 R09: 0000000000000000 [ 35.696709] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000006400 [ 35.703986] R13: ffff8880952b2bc0 R14: ffff8880b257c7b0 R15: ffff88808bd5fc88 [ 35.711282] ? vprintk_func+0x81/0x180 [ 35.715302] ? __writeback_inodes_sb_nr.cold+0x11/0x18 [ 35.720602] ? bdi_split_work_to_wbs+0xfa0/0xfa0 [ 35.725364] ? btrfs_commit_transaction+0x1dfa/0x2480 [ 35.730644] ? get_nr_dirty_inodes+0x19e/0x210 [ 35.735234] btrfs_commit_transaction+0x1bb1/0x2480 [ 35.740250] ? do_raw_spin_unlock+0x171/0x230 [ 35.744741] ? _raw_spin_unlock+0x29/0x40 [ 35.748885] ? btrfs_apply_pending_changes+0x150/0x150 [ 35.754159] ? btrfs_record_root_in_trans+0x13c/0x190 [ 35.759362] ? start_transaction+0x239/0xf90 [ 35.763783] transaction_kthread+0x385/0x490 [ 35.768199] ? __kthread_parkme+0x133/0x1e0 [ 35.772850] ? open_ctree+0x61e0/0x61e0 [ 35.776824] kthread+0x33f/0x460 [ 35.780193] ? kthread_park+0x180/0x180 [ 35.784305] ret_from_fork+0x24/0x30 [ 35.789069] Kernel Offset: disabled [ 35.792743] Rebooting in 86400 seconds..