[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.91' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 32.251243] EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue [ 32.267938] EXT4-fs error (device loop0): ext4_mb_generate_buddy:754: group 0, block bitmap and bg descriptor inconsistent: 25 vs 150994969 free clusters [ 32.283049] ------------[ cut here ]------------ [ 32.287838] kernel BUG at fs/ext4/inode.c:2861! [ 32.292561] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 32.297907] Modules linked in: [ 32.301077] CPU: 1 PID: 7975 Comm: syz-executor328 Not tainted 4.14.300-syzkaller #0 [ 32.308928] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 32.318263] task: ffff888095950680 task.stack: ffff8880b31c0000 [ 32.324299] RIP: 0010:ext4_writepages+0x27fc/0x32a0 [ 32.329286] RSP: 0018:ffff8880b31c7638 EFLAGS: 00010297 [ 32.334621] RAX: ffff888095950680 RBX: 00000000a802c010 RCX: 1ffff11012b2a2d1 [ 32.341899] RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff888095951688 [ 32.349230] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000001be6 [ 32.356475] R10: 0000000000000001 R11: ffff888095950680 R12: 0000000000000001 [ 32.363719] R13: dffffc0000000000 R14: ffff88808df83870 R15: ffff8880b31c7a60 [ 32.370964] FS: 00007fc87263f700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 32.379161] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.385015] CR2: 0000000020000f88 CR3: 00000000b2f6d000 CR4: 00000000003406e0 [ 32.392265] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.399512] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.406756] Call Trace: [ 32.409374] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 32.414477] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 32.419898] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 32.424892] ? ext4_mark_inode_dirty+0x7a0/0x7a0 [ 32.429616] ? __ext4_handle_dirty_metadata+0x120/0x480 [ 32.434950] ? find_inode_nowait+0x142/0x180 [ 32.439331] ? __lock_acquire+0x5fc/0x3f20 [ 32.443539] ? ext4_chunk_trans_blocks+0x30/0x30 [ 32.448282] ? trace_hardirqs_on+0x10/0x10 [ 32.452495] ? ext4_mark_inode_dirty+0x1db/0x7a0 [ 32.457222] ? ext4_expand_extra_isize+0x460/0x460 [ 32.462125] ? ext4_mark_inode_dirty+0x7a0/0x7a0 [ 32.466854] do_writepages+0xc3/0x240 [ 32.470627] ? ext4_get_nojournal+0x46/0xa0 [ 32.474919] ? page_writeback_cpu_online+0x10/0x10 [ 32.479821] ? lock_acquire+0x170/0x3f0 [ 32.483766] ? do_raw_spin_unlock+0x164/0x220 [ 32.488232] ? _raw_spin_unlock+0x29/0x40 [ 32.492354] ? wbc_attach_and_unlock_inode+0x5e8/0x8d0 [ 32.497605] __filemap_fdatawrite_range+0x236/0x310 [ 32.502592] ? replace_page_cache_page+0x700/0x700 [ 32.507496] file_write_and_wait_range+0x86/0xd0 [ 32.512223] __generic_file_fsync+0x70/0x190 [ 32.516602] ext4_sync_file+0x8ed/0x12c0 [ 32.520633] ? ext4_getfsmap+0x8c0/0x8c0 [ 32.524666] vfs_fsync_range+0x103/0x260 [ 32.528698] ext4_file_write_iter+0x5fa/0xd20 [ 32.533166] ? aa_file_perm+0x304/0xab0 [ 32.537110] ? ext4_file_read_iter+0x330/0x330 [ 32.541664] ? trace_hardirqs_on+0x10/0x10 [ 32.545873] ? iov_iter_init+0xa6/0x1c0 [ 32.549818] __vfs_write+0x44c/0x630 [ 32.553505] ? kernel_read+0x110/0x110 [ 32.557368] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 32.562360] vfs_write+0x17f/0x4d0 [ 32.565907] SyS_write+0xf2/0x210 [ 32.569339] ? SyS_read+0x210/0x210 [ 32.572938] ? __do_page_fault+0x159/0xad0 [ 32.577146] ? do_syscall_64+0x4c/0x640 [ 32.581099] ? SyS_read+0x210/0x210 [ 32.584698] do_syscall_64+0x1d5/0x640 [ 32.588559] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 32.593721] Code: ff ff 4c 89 ff e8 95 b5 c3 ff e9 98 db ff ff e8 cb f7 99 ff 48 8b bc 24 b8 00 00 00 e8 7e 5b b1 ff e9 18 f5 ff ff e8 b4 f7 99 ff <0f> 0b e8 ad f7 99 ff 48 8b bc 24 b8 00 00 00 e8 60 5b b1 ff 8b [ 32.612953] RIP: ext4_writepages+0x27fc/0x32a0 RSP: ffff8880b31c7638 [ 32.623876] ---[ end trace 84fbe390458e3df8 ]--- [ 32.628620] Kernel panic - not syncing: Fatal exception [ 32.634114] Kernel Offset: disabled [ 32.637724] Rebooting in 86400 seconds..