------------[ cut here ]------------
kernel BUG at fs/ext4/extents.c:2142!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 43 Comm: kworker/u4:2 Tainted: G        W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work
RIP: 0010:ext4_ext_insert_extent+0x4790/0x47d0 fs/ext4/extents.c:2142
Code: ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c c6 e8 ff ff 4c 89 f7 e8 e1 52 d1 ff e9 b9 e8 ff ff e8 b7 20 8c ff 0f 0b e8 b0 20 8c ff <0f> 0b e8 a9 20 8c ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 40
RSP: 0018:ffffc900002cf4c0 EFLAGS: 00010293
RAX: ffffffff81e54c50 RBX: ffff88815a131400 RCX: ffff888109536540
RDX: 0000000000000000 RSI: 0000000000000054 RDI: 0000000000000054
RBP: ffffc900002cf670 R08: ffff88811818e0af R09: 1ffff11023031c15
R10: dffffc0000000000 R11: ffffed1023031c16 R12: 0000000000000054
R13: ffff8881004b3a98 R14: ffff88815a131454 R15: 0000000000000054
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc96c501ff8 CR3: 000000013072d000 CR4: 00000000003526a0
Call Trace:
 <TASK>
 ext4_ext_map_blocks+0x1869/0x61d0 fs/ext4/extents.c:4361
 ext4_map_blocks+0x9d8/0x1b70 fs/ext4/inode.c:679
 ext4_convert_unwritten_extents+0x2b7/0x5f0 fs/ext4/extents.c:4865
 ext4_convert_unwritten_io_end_vec+0x103/0x180 fs/ext4/extents.c:4904
 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+0x71f/0xc40 kernel/workqueue.c:2302
 worker_thread+0xa29/0x11e0 kernel/workqueue.c:2449
 kthread+0x281/0x320 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_ext_insert_extent+0x4790/0x47d0 fs/ext4/extents.c:2142
Code: ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c c6 e8 ff ff 4c 89 f7 e8 e1 52 d1 ff e9 b9 e8 ff ff e8 b7 20 8c ff 0f 0b e8 b0 20 8c ff <0f> 0b e8 a9 20 8c ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 40
RSP: 0018:ffffc900002cf4c0 EFLAGS: 00010293
RAX: ffffffff81e54c50 RBX: ffff88815a131400 RCX: ffff888109536540
RDX: 0000000000000000 RSI: 0000000000000054 RDI: 0000000000000054
RBP: ffffc900002cf670 R08: ffff88811818e0af R09: 1ffff11023031c15
R10: dffffc0000000000 R11: ffffed1023031c16 R12: 0000000000000054
R13: ffff8881004b3a98 R14: ffff88815a131454 R15: 0000000000000054
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc96b5e9e80 CR3: 000000012e45a000 CR4: 00000000003526a0