[ OK ] Started OpenBSD Secure Shell server. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.208' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 54.639708][ T359] EXT4-fs warning (device sda1): ext4_da_update_reserve_space:344: ext4_da_update_reserve_space: ino 15722, used 1 with only 0 reserved data blocks [ 54.655169][ T359] ------------[ cut here ]------------ [ 54.660651][ T359] WARNING: CPU: 1 PID: 359 at fs/ext4/inode.c:348 ext4_da_update_reserve_space+0x622/0x7d0 [ 54.671085][ T359] Kernel panic - not syncing: panic_on_warn set ... [ 54.677675][ T359] CPU: 1 PID: 359 Comm: kworker/u4:5 Not tainted 5.6.0-rc7-syzkaller #0 executing program [ 54.685997][ T359] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.696064][ T359] Workqueue: writeback wb_workfn (flush-8:0) [ 54.702046][ T359] Call Trace: [ 54.705347][ T359] dump_stack+0x188/0x20d [ 54.709686][ T359] ? ext4_da_update_reserve_space+0x5c0/0x7d0 [ 54.715760][ T359] panic+0x2e3/0x75c [ 54.719677][ T359] ? add_taint.cold+0x16/0x16 [ 54.724366][ T359] ? printk+0xba/0xed [ 54.728361][ T359] ? kmsg_dump_rewind_nolock+0xd9/0xd9 [ 54.733828][ T359] ? __warn.cold+0x14/0x35 [ 54.738253][ T359] ? __warn+0xd5/0x1c8 [ 54.742328][ T359] ? ext4_da_update_reserve_space+0x622/0x7d0 [ 54.748400][ T359] __warn.cold+0x2f/0x35 [ 54.752649][ T359] ? ext4_da_update_reserve_space+0x622/0x7d0 [ 54.758723][ T359] report_bug+0x27b/0x2f0 [ 54.763061][ T359] do_error_trap+0x12b/0x220 [ 54.767660][ T359] ? ext4_da_update_reserve_space+0x622/0x7d0 [ 54.773732][ T359] do_invalid_op+0x32/0x40 [ 54.778150][ T359] ? ext4_da_update_reserve_space+0x622/0x7d0 [ 54.784218][ T359] invalid_op+0x23/0x30 executing program [ 54.788376][ T359] RIP: 0010:ext4_da_update_reserve_space+0x622/0x7d0 [ 54.795037][ T359] Code: 02 00 0f 85 94 01 00 00 48 8b 7d 28 49 c7 c0 20 72 3c 88 41 56 48 c7 c1 80 60 3c 88 53 ba 58 01 00 00 4c 89 c6 e8 1e 6d 0d 00 <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 0f b6 04 [ 54.814635][ T359] RSP: 0018:ffffc90002197288 EFLAGS: 00010296 [ 54.820700][ T359] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 [ 54.828671][ T359] RDX: 0000000000000000 RSI: ffffffff820bf066 RDI: fffff52000432e21 [ 54.836646][ T359] RBP: ffff888086b744c8 R08: 0000000000000091 R09: ffffed1015ce6659 [ 54.844616][ T359] R10: ffffed1015ce6658 R11: ffff8880ae7332c7 R12: 0000000000000001 [ 54.852587][ T359] R13: ffff888086b74990 R14: 0000000000000000 R15: ffff888086b74a40 [ 54.860578][ T359] ? __ext4_warning+0xe6/0x140 [ 54.865351][ T359] ? ext4_da_update_reserve_space+0x622/0x7d0 [ 54.871428][ T359] ext4_ext_map_blocks+0x24aa/0x37d0 [ 54.876724][ T359] ? ext4_ext_release+0x10/0x10 [ 54.882629][ T359] ? lock_acquire+0x197/0x420 [ 54.887310][ T359] ? ext4_map_blocks+0x459/0x1650 [ 54.892343][ T359] ? __down_timeout+0x2d0/0x2d0 [ 54.897199][ T359] ? ext4_es_lookup_extent+0x41d/0xd30 [ 54.902667][ T359] ext4_map_blocks+0x4cb/0x1650 [ 54.907523][ T359] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 54.912729][ T359] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 54.920446][ T359] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 54.926426][ T359] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 54.931900][ T359] ext4_writepages+0x19eb/0x3080 [ 54.936856][ T359] ? ext4_mark_inode_dirty+0x900/0x900 [ 54.942320][ T359] ? __lock_acquire+0x14bd/0x3ca0 [ 54.947356][ T359] ? mark_held_locks+0xe0/0xe0 [ 54.952132][ T359] ? ext4_mark_inode_dirty+0x900/0x900 [ 54.957598][ T359] ? do_writepages+0xfa/0x2a0 [ 54.962282][ T359] do_writepages+0xfa/0x2a0 [ 54.966795][ T359] ? page_writeback_cpu_online+0x10/0x10 [ 54.972441][ T359] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 54.977992][ T359] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 54.983976][ T359] ? lock_downgrade+0x7f0/0x7f0 [ 54.988842][ T359] __writeback_single_inode+0x12a/0x1410 [ 54.994482][ T359] ? _raw_spin_unlock+0x24/0x40 [ 54.999340][ T359] ? wbc_attach_and_unlock_inode+0x60a/0x9c0 [ 55.005326][ T359] writeback_sb_inodes+0x515/0xdd0 [ 55.010461][ T359] ? __writeback_single_inode+0x1410/0x1410 [ 55.017059][ T359] ? wb_io_lists_populated+0x5a/0x130 [ 55.022432][ T359] ? queue_io+0x3fd/0x560 [ 55.026809][ T359] wb_writeback+0x2a5/0xd90 [ 55.031300][ T359] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 55.037616][ T359] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 55.043229][ T359] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 55.049195][ T359] wb_workfn+0x339/0x11c0 [ 55.053557][ T359] ? inode_wait_for_writeback+0x30/0x30 [ 55.059138][ T359] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 55.064701][ T359] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 55.070769][ T359] process_one_work+0x94b/0x1690 [ 55.075712][ T359] ? pwq_dec_nr_in_flight+0x310/0x310 [ 55.081115][ T359] ? do_raw_spin_lock+0x129/0x2e0 [ 55.086212][ T359] worker_thread+0x96/0xe20 [ 55.090698][ T359] ? process_one_work+0x1690/0x1690 [ 55.095883][ T359] kthread+0x357/0x430 [ 55.099940][ T359] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 55.105678][ T359] ret_from_fork+0x24/0x30 [ 55.111362][ T359] Kernel Offset: disabled [ 55.115858][ T359] Rebooting in 86400 seconds..