EXT4-fs error (device loop2): ext4_lookup:1641: inode #2: comm syz-executor.2: deleted inode referenced: 15
EXT4-fs error (device loop0): ext4_lookup:1641: inode #2: comm syz-executor.0: deleted inode referenced: 15
EXT4-fs error (device loop5): ext4_lookup:1641: inode #2: comm syz-executor.5: deleted inode referenced: 15
------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2861!
EXT4-fs error (device loop5): ext4_validate_block_bitmap:405: comm syz-executor.5: bg 0: block 5: invalid block bitmap
EXT4-fs error (device loop2): ext4_validate_block_bitmap:405: comm syz-executor.2: bg 0: block 5: invalid block bitmap
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
EXT4-fs (loop2): Delayed block allocation failed for inode 18 at logical offset 0 with max blocks 1 with error 117
CPU: 1 PID: 7988 Comm: kworker/u4:0 Not tainted 4.14.299-syzkaller #0
EXT4-fs (loop2): This should not happen!! Data will be lost

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: writeback wb_workfn (flush-7:2)
EXT4-fs error (device loop0): ext4_validate_block_bitmap:405: comm syz-executor.0: bg 0: block 5: invalid block bitmap
task: ffff8880b28421c0 task.stack: ffff88809a320000
RIP: 0010:ext4_writepages+0x27fc/0x32a0 fs/ext4/inode.c:2861
RSP: 0018:ffff88809a327578 EFLAGS: 00010297
RAX: ffff8880b28421c0 RBX: 00000000a802e014 RCX: 1ffff11016508639
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff8880b28431c8
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000050510
R10: ffff8880b2842ac0 R11: ffff8880b28421c0 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff88808938b7b0 R15: ffff88809a327a50
FS:  0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb557fa6718 CR3: 0000000099892000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
EXT4-fs (loop0): Delayed block allocation failed for inode 18 at logical offset 0 with max blocks 1 with error 117
EXT4-fs (loop0): This should not happen!! Data will be lost

 do_writepages+0xc3/0x240 mm/page-writeback.c:2361
 __writeback_single_inode+0xda/0x1010 fs/fs-writeback.c:1382
EXT4-fs (loop5): Delayed block allocation failed for inode 18 at logical offset 0 with max blocks 1 with error 117
 writeback_sb_inodes+0x48b/0xd30 fs/fs-writeback.c:1645
EXT4-fs (loop5): This should not happen!! Data will be lost

 __writeback_inodes_wb+0xbf/0x230 fs/fs-writeback.c:1716
 wb_writeback+0x710/0xb80 fs/fs-writeback.c:1822
 wb_do_writeback fs/fs-writeback.c:1952 [inline]
 wb_workfn+0x2bd/0xf50 fs/fs-writeback.c:1988
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406
Code: ff ff 4c 89 ff e8 b5 b5 c3 ff e9 98 db ff ff e8 eb f7 99 ff 48 8b bc 24 b8 00 00 00 e8 9e 5b b1 ff e9 18 f5 ff ff e8 d4 f7 99 ff <0f> 0b e8 cd f7 99 ff 48 8b bc 24 b8 00 00 00 e8 80 5b b1 ff 8b 
RIP: ext4_writepages+0x27fc/0x32a0 fs/ext4/inode.c:2861 RSP: ffff88809a327578
---[ end trace 1d946943efa64870 ]---