[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.157' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 32.186142] EXT4-fs error (device sda1): ext4_read_block_bitmap_nowait:429: comm kworker/u4:2: Invalid block bitmap block 5 in block_group 3 [ 32.200458] EXT4-fs (sda1): Delayed block allocation failed for inode 13854 at logical offset 2048 with max blocks 2048 with error 117 [ 32.214595] EXT4-fs (sda1): This should not happen!! Data will be lost [ 32.214595] [ 32.235001] EXT4-fs error (device sda1): ext4_read_block_bitmap_nowait:429: comm kworker/u4:2: Invalid block bitmap block 6 in block_group 4 [ 32.248912] EXT4-fs error (device sda1): ext4_read_block_bitmap_nowait:429: comm kworker/u4:2: Invalid block bitmap block 7 in block_group 5 [ 32.262663] EXT4-fs error (device sda1): ext4_read_block_bitmap_nowait:429: comm kworker/u4:2: Invalid block bitmap block 8 in block_group 6 [ 32.276935] EXT4-fs error (device sda1): ext4_read_block_bitmap_nowait:429: comm kworker/u4:2: Invalid block bitmap block 9 in block_group 7 [ 32.295384] EXT4-fs error (device sda1): ext4_read_block_bitmap_nowait:429: comm kworker/u4:2: Invalid block bitmap block 10 in block_group 8 [ 32.309579] EXT4-fs error (device sda1): ext4_read_block_bitmap_nowait:429: comm kworker/u4:2: Invalid block bitmap block 11 in block_group 9 [ 32.323755] EXT4-fs error (device sda1): ext4_read_block_bitmap_nowait:429: comm kworker/u4:2: Invalid block bitmap block 12 in block_group 10 [ 32.338064] EXT4-fs error (device sda1): ext4_read_block_bitmap_nowait:429: comm kworker/u4:2: Invalid block bitmap block 13 in block_group 11 [ 32.351752] EXT4-fs error (device sda1): ext4_read_block_bitmap_nowait:429: comm kworker/u4:2: Invalid block bitmap block 14 in block_group 12 [ 32.368746] EXT4-fs (sda1): Delayed block allocation failed for inode 13855 at logical offset 0 with max blocks 435 with error 117 [ 32.380649] EXT4-fs (sda1): This should not happen!! Data will be lost [ 32.380649] [ 32.390665] ------------[ cut here ]------------ [ 32.395478] kernel BUG at fs/ext4/ext4.h:2870! [ 32.400231] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 32.405594] CPU: 0 PID: 7823 Comm: rs:main Q:Reg Not tainted 4.19.204-syzkaller #0 [ 32.413279] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.422622] RIP: 0010:ext4_mb_load_buddy_gfp+0x1460/0x1a90 [ 32.428223] Code: 26 06 9f ff e9 b9 f6 ff ff e8 7c e9 7f ff e9 b4 f4 ff ff e8 72 e9 7f ff 48 89 ef e8 0a 06 9f ff e9 51 fa ff ff e8 60 e9 7f ff <0f> 0b e8 59 e9 7f ff 8b 54 24 1c 44 89 e6 48 89 ef e8 da d4 ff ff [ 32.447102] RSP: 0018:ffff8880a2d97588 EFLAGS: 00010293 [ 32.452444] RAX: ffff8880a2c662c0 RBX: ffff8880a2d976c8 RCX: ffffffff81e295e3 [ 32.459689] RDX: 0000000000000000 RSI: ffffffff81e2a930 RDI: 0000000000000004 [ 32.466948] RBP: ffff8882350aee80 R08: 0000000000000000 R09: 00000000fffe8f8c [ 32.474193] R10: 0000000000000004 R11: 0000000000074071 R12: 00000000fffe8f8c [ 32.481443] R13: ffff8882350b0ec0 R14: ffff8882350af500 R15: 0000000000000010 [ 32.488692] FS: 00007f9793e71700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 32.496891] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.502749] CR2: 0000556e2a562d68 CR3: 00000000b2cf7000 CR4: 00000000001406f0 [ 32.509997] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.517244] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.524490] Call Trace: [ 32.527069] ? ext4_discard_preallocations+0x251/0xfb0 [ 32.532327] ? ext4_get_group_number+0x146/0x1d0 [ 32.537060] ext4_discard_preallocations+0xaf4/0xfb0 [ 32.542141] ? ext4_exit_mballoc+0xb0/0xb0 [ 32.546350] ? ext4_orphan_add+0x253/0xb90 [ 32.550581] ? lock_acquire+0x170/0x3c0 [ 32.554531] ? ext4_truncate+0x746/0x1380 [ 32.558662] ext4_truncate+0x74e/0x1380 [ 32.562615] ? ext4_punch_hole+0x11f0/0x11f0 [ 32.567001] ext4_write_begin+0xb37/0x1610 [ 32.571213] ? ext4_truncate+0x1380/0x1380 [ 32.575440] ? up_read+0x17/0x110 [ 32.578877] ? try_to_writeback_inodes_sb+0xe2/0x110 [ 32.583956] ext4_da_write_begin+0x737/0x10e0 [ 32.588429] ? balance_dirty_pages_ratelimited+0x684/0x1df0 [ 32.594118] ? iov_iter_fault_in_readable+0x1fc/0x3f0 [ 32.599284] ? ext4_write_begin+0x1610/0x1610 [ 32.603755] ? iov_iter_init+0x1d0/0x1d0 [ 32.607794] ? iov_iter_advance+0x210/0xdb0 [ 32.612095] generic_perform_write+0x1f8/0x4d0 [ 32.616657] ? __mnt_drop_write_file+0x6f/0xa0 [ 32.621215] ? filemap_page_mkwrite+0x2f0/0x2f0 [ 32.625861] ? current_time+0x1c0/0x1c0 [ 32.629812] ? lock_acquire+0x170/0x3c0 [ 32.633760] __generic_file_write_iter+0x24b/0x610 [ 32.638666] ext4_file_write_iter+0x2fe/0xf20 [ 32.643140] ? ext4_file_open+0x600/0x600 [ 32.647261] ? do_futex+0x171/0x1880 [ 32.650953] ? mark_held_locks+0xf0/0xf0 [ 32.654995] __vfs_write+0x51b/0x770 [ 32.658702] ? kernel_read+0x110/0x110 [ 32.662572] ? check_preemption_disabled+0x41/0x280 [ 32.667570] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 32.672567] vfs_write+0x1f3/0x540 [ 32.676083] ksys_write+0x12b/0x2a0 [ 32.679703] ? __ia32_sys_read+0xb0/0xb0 [ 32.683741] ? trace_hardirqs_off_caller+0x6e/0x210 [ 32.688733] ? do_syscall_64+0x21/0x620 [ 32.692683] do_syscall_64+0xf9/0x620 [ 32.696465] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.701629] RIP: 0033:0x7f97968b51cd [ 32.705322] Code: c2 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ae fc ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 f7 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 32.724201] RSP: 002b:00007f9793e70590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 [ 32.731887] RAX: ffffffffffffffda RBX: 00007f9788024dd0 RCX: 00007f97968b51cd [ 32.739133] RDX: 0000000000000146 RSI: 00007f9788024dd0 RDI: 0000000000000008 [ 32.746375] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 32.753619] R10: 0000000000000000 R11: 0000000000000293 R12: 00007f9788024b50 [ 32.760863] R13: 00007f9793e705b0 R14: 00005632acf09440 R15: 0000000000000146 [ 32.768112] Modules linked in: [ 32.772557] ---[ end trace 5761d10fee6ec9a5 ]--- [ 32.777316] RIP: 0010:ext4_mb_load_buddy_gfp+0x1460/0x1a90 [ 32.777559] EXT4-fs (sda1): Delayed block allocation failed for inode 13856 at logical offset 0 with max blocks 301 with error 117 [ 32.783081] Code: 26 06 9f ff e9 b9 f6 ff ff e8 7c e9 7f ff e9 b4 f4 ff ff e8 72 e9 7f ff 48 89 ef e8 0a 06 9f ff e9 51 fa ff ff e8 60 e9 7f ff <0f> 0b e8 59 e9 7f ff 8b 54 24 1c 44 89 e6 48 89 ef e8 da d4 ff ff [ 32.808105] EXT4-fs (sda1): This should not happen!! Data will be lost [ 32.808105] [ 32.814029] RSP: 0018:ffff8880a2d97588 EFLAGS: 00010293 [ 32.827511] RAX: ffff8880a2c662c0 RBX: ffff8880a2d976c8 RCX: ffffffff81e295e3 [ 32.834844] RDX: 0000000000000000 RSI: ffffffff81e2a930 RDI: 0000000000000004 [ 32.834862] EXT4-fs (sda1): Delayed block allocation failed for inode 13858 at logical offset 0 with max blocks 1 with error 117 [ 32.842145] RBP: ffff8882350aee80 R08: 0000000000000000 R09: 00000000fffe8f8c [ 32.854799] EXT4-fs (sda1): This should not happen!! Data will be lost [ 32.854799] [ 32.861149] R10: 0000000000000004 R11: 0000000000074071 R12: 00000000fffe8f8c [ 32.861156] R13: ffff8882350b0ec0 R14: ffff8882350af500 R15: 0000000000000010 [ 32.861166] FS: 00007f9793e71700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 32.861174] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.861180] CR2: 0000556e2a562d68 CR3: 00000000b2cf7000 CR4: 00000000001406f0 [ 32.861190] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.861204] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.920115] Kernel panic - not syncing: Fatal exception [ 32.926981] Kernel Offset: disabled [ 32.930589] Rebooting in 86400 seconds..