------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:4219!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8 Comm: kworker/u4:0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work

RIP: 0010:ext4_mb_normalize_request+0x192c/0x1990 fs/ext4/mballoc.c:4219
Code: ff e8 48 ea 8b ff 48 c7 c7 a0 b1 89 86 48 89 de 48 8b 55 c8 e8 45 a2 90 00 e9 8e fa ff ff e8 2b ea 8b ff 0f 0b e8 24 ea 8b ff <0f> 0b e8 1d ea 8b ff e9 b7 fb ff ff e8 13 ea 8b ff 0f 0b e8 0c ea
RSP: 0018:ffffc900000873c8 EFLAGS: 00010293
RAX: ffffffff81dddcbc RBX: 0000000000000000 RCX: ffff8881002713c0
RDX: 0000000000000000 RSI: 0000000000000027 RDI: 0000000000000030
RBP: ffffc900000874b0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000010e68 R12: 0000000000000030
R13: 0000000000000027 R14: ffff8881313753f0 R15: 0000000000000027
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4686b25000 CR3: 000000010d6c3000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_mb_new_blocks+0xbfd/0x42c0 fs/ext4/mballoc.c:5779
 ext4_ext_map_blocks+0x1722/0x61e0 fs/ext4/extents.c:4347
 ext4_map_blocks+0x988/0x1b30 fs/ext4/inode.c:674
 ext4_convert_unwritten_extents+0x2b7/0x5f0 fs/ext4/extents.c:4875
 ext4_convert_unwritten_io_end_vec+0x103/0x180 fs/ext4/extents.c:4914
 ext4_end_io_end fs/ext4/page-io.c:186 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:259 [inline]
 ext4_end_io_rsv_work+0x2c1/0x610 fs/ext4/page-io.c:273
 process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
 worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
 kthread+0x411/0x500 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Modules linked in:
---[ end trace f87a43cd90fc1c81 ]---
RIP: 0010:ext4_mb_normalize_request+0x192c/0x1990 fs/ext4/mballoc.c:4219
Code: ff e8 48 ea 8b ff 48 c7 c7 a0 b1 89 86 48 89 de 48 8b 55 c8 e8 45 a2 90 00 e9 8e fa ff ff e8 2b ea 8b ff 0f 0b e8 24 ea 8b ff <0f> 0b e8 1d ea 8b ff e9 b7 fb ff ff e8 13 ea 8b ff 0f 0b e8 0c ea
RSP: 0018:ffffc900000873c8 EFLAGS: 00010293
RAX: ffffffff81dddcbc RBX: 0000000000000000 RCX: ffff8881002713c0
RDX: 0000000000000000 RSI: 0000000000000027 RDI: 0000000000000030
RBP: ffffc900000874b0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000010e68 R12: 0000000000000030
R13: 0000000000000027 R14: ffff8881313753f0 R15: 0000000000000027
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4686b25000 CR3: 000000010d6c3000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400