------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:3676!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 316 Comm: kworker/u4:4 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work

RIP: 0010:ext4_mb_normalize_request+0x1283/0x12e0 fs/ext4/mballoc.c:3676
Code: 4d a8 80 e1 07 80 c1 03 38 c1 0f 8c 79 fc ff ff 48 8b 7d a8 e8 7e c8 cb ff e9 6b fc ff ff e8 f4 d9 91 ff 0f 0b e8 ed d9 91 ff <0f> 0b e8 e6 d9 91 ff 0f 0b e8 df d9 91 ff 0f 0b e8 d8 d9 91 ff 0f
RSP: 0018:ffffc90000c17410 EFLAGS: 00010293
RAX: ffffffff81d1ca93 RBX: 0000000000000027 RCX: ffff88812ba98000
RDX: 0000000000000000 RSI: 0000000000000027 RDI: 0000000000000030
RBP: ffffc90000c174f0 R08: 0000000000000004 R09: 0000000000000003
R10: fffff52000182e74 R11: 1ffff92000182e74 R12: 0000000000000030
R13: 0000000000000027 R14: ffff8881312bc738 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb446f26000 CR3: 0000000114072000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_mb_new_blocks+0xc21/0x42f0 fs/ext4/mballoc.c:5233
 ext4_ext_map_blocks+0x167f/0x5d80 fs/ext4/extents.c:4335
 ext4_map_blocks+0x978/0x1bc0 fs/ext4/inode.c:674
 ext4_convert_unwritten_extents+0x21c/0x3f0 fs/ext4/extents.c:4862
 ext4_convert_unwritten_io_end_vec+0x103/0x180 fs/ext4/extents.c:4901
 ext4_end_io_end fs/ext4/page-io.c:189 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:262 [inline]
 ext4_end_io_rsv_work+0x2b9/0x600 fs/ext4/page-io.c:276
 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301
 worker_thread+0xa6a/0x13b0 kernel/workqueue.c:2447
 kthread+0x346/0x3d0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
Modules linked in:
---[ end trace f22aa54242357acf ]---
RIP: 0010:ext4_mb_normalize_request+0x1283/0x12e0 fs/ext4/mballoc.c:3676
Code: 4d a8 80 e1 07 80 c1 03 38 c1 0f 8c 79 fc ff ff 48 8b 7d a8 e8 7e c8 cb ff e9 6b fc ff ff e8 f4 d9 91 ff 0f 0b e8 ed d9 91 ff <0f> 0b e8 e6 d9 91 ff 0f 0b e8 df d9 91 ff 0f 0b e8 d8 d9 91 ff 0f
RSP: 0018:ffffc90000c17410 EFLAGS: 00010293
RAX: ffffffff81d1ca93 RBX: 0000000000000027 RCX: ffff88812ba98000
RDX: 0000000000000000 RSI: 0000000000000027 RDI: 0000000000000030
RBP: ffffc90000c174f0 R08: 0000000000000004 R09: 0000000000000003
R10: fffff52000182e74 R11: 1ffff92000182e74 R12: 0000000000000030
R13: 0000000000000027 R14: ffff8881312bc738 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb446f26000 CR3: 0000000114072000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400