------------[ cut here ]------------
kernel BUG at fs/ext4/extents.c:3181!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 1003 Comm: syz.6.120 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:ext4_split_extent_at+0xe4c/0xe70 fs/ext4/extents.c:3181
Code: fb ff ff 89 d9 80 e1 07 fe c1 38 c1 0f 8c c0 fb ff ff 48 89 df 49 89 f6 e8 a1 5d d3 ff 4c 89 f6 e9 ad fb ff ff e8 34 6f 99 ff <0f> 0b e8 2d 6f 99 ff 0f 0b e8 26 6f 99 ff 0f 0b e8 1f 6f 99 ff 0f
RSP: 0000:ffffc90001796c80 EFLAGS: 00010293
RAX: ffffffff81ca354c RBX: 0000000000000000 RCX: ffff88811af393c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000049
RBP: ffffc90001796df0 R08: 0000000000000017 R09: 000000000000043b
R10: ffffed102342394a R11: 1ffff11023423948 R12: 0000000000000017
R13: 0000000000000030 R14: 0000000000000000 R15: 0000000000000030
FS:  00007fd5744d86c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557d80f4a8 CR3: 000000010f069000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_split_extent+0x386/0x4e0 fs/ext4/extents.c:3380
 ext4_split_convert_extents fs/ext4/extents.c:3709 [inline]
 ext4_ext_handle_unwritten_extents fs/ext4/extents.c:3870 [inline]
 ext4_ext_map_blocks+0x1084/0x5d80 fs/ext4/extents.c:4225
 ext4_map_blocks+0x978/0x1bc0 fs/ext4/inode.c:674
 mpage_map_one_extent fs/ext4/inode.c:2452 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2505 [inline]
 ext4_writepages+0x11d5/0x2e00 fs/ext4/inode.c:2873
 do_writepages+0x12a/0x270 mm/page-writeback.c:2380
 __filemap_fdatawrite_range+0x2bc/0x360 mm/filemap.c:427
 filemap_write_and_wait_range+0x65/0x290 mm/filemap.c:660
 ext4_punch_hole+0x120/0xad0 fs/ext4/inode.c:4118
 ext4_fallocate+0x271/0x1a70 fs/ext4/extents.c:4758
 vfs_fallocate+0x4b4/0x590 fs/open.c:310
 madvise_remove mm/madvise.c:880 [inline]
 madvise_vma_behavior mm/madvise.c:904 [inline]
 madvise_walk_vmas mm/madvise.c:1131 [inline]
 do_madvise+0x12cf/0x1df0 mm/madvise.c:1308
 __do_sys_madvise mm/madvise.c:1322 [inline]
 __se_sys_madvise mm/madvise.c:1320 [inline]
 __x64_sys_madvise+0xa9/0xc0 mm/madvise.c:1320
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fd574668749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd5744d8038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007fd5748befa0 RCX: 00007fd574668749
RDX: 0000000000000009 RSI: 0000000000600003 RDI: 0000200000000000
RBP: 00007fd5746ecf91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd5748bf038 R14: 00007fd5748befa0 R15: 00007ffdfb314518
Modules linked in:
---[ end trace 8877949fd1b01b39 ]---
RIP: 0010:ext4_split_extent_at+0xe4c/0xe70 fs/ext4/extents.c:3181
Code: fb ff ff 89 d9 80 e1 07 fe c1 38 c1 0f 8c c0 fb ff ff 48 89 df 49 89 f6 e8 a1 5d d3 ff 4c 89 f6 e9 ad fb ff ff e8 34 6f 99 ff <0f> 0b e8 2d 6f 99 ff 0f 0b e8 26 6f 99 ff 0f 0b e8 1f 6f 99 ff 0f
RSP: 0000:ffffc90001796c80 EFLAGS: 00010293
RAX: ffffffff81ca354c RBX: 0000000000000000 RCX: ffff88811af393c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000049
RBP: ffffc90001796df0 R08: 0000000000000017 R09: 000000000000043b
R10: ffffed102342394a R11: 1ffff11023423948 R12: 0000000000000017
R13: 0000000000000030 R14: 0000000000000000 R15: 0000000000000030
FS:  00007fd5744d86c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd41ff21000 CR3: 000000010f069000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400