ext4 filesystem being mounted at /0/file0aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa supports timestamps until 2038-01-19 (0x7fffffff)
------------[ cut here ]------------
kernel BUG at fs/ext4/extents.c:3181!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 2152 Comm: syz.2.523 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2025
RIP: 0010:ext4_split_extent_at+0xe6e/0xe90 fs/ext4/extents.c:3181
Code: 48 89 df 48 89 74 24 68 e8 1f 80 d3 ff 48 8b 74 24 68 e9 5a fb ff ff e8 00 93 99 ff 0f 0b e8 f9 92 99 ff 0f 0b e8 f2 92 99 ff <0f> 0b e8 eb 92 99 ff 0f 0b e8 e4 92 99 ff 0f 0b e8 dd 92 99 ff 0f
RSP: 0018:ffffc90003f174a0 EFLAGS: 00010293
RAX: ffffffff81ca131e RBX: 0000000000000000 RCX: ffff888136410000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000002c
RBP: ffffc90003f17610 R08: 0000000000000000 R09: 0000000050000028
R10: ffffed1023a6c72a R11: 1ffff11023a6c728 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff11021315229 R15: 0000000000000000
FS:  00007f8535adb6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000001007f CR3: 0000000119eb9000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_force_split_extent_at fs/ext4/extents.c:318 [inline]
 ext4_ext_remove_space+0x677/0x4920 fs/ext4/extents.c:2875
 ext4_punch_hole+0x6f8/0xad0 fs/ext4/inode.c:4217
 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: 0033:0x7f853606a929
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:00007f8535adb038 EFLAGS: 00000246
 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f8536291fa0 RCX: 00007f853606a929
RDX: 0000000000000009 RSI: 000000000060000b RDI: 0000200000000000
RBP: 00007f85360ecb39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8536291fa0 R15: 00007ffe16880ba8
Modules linked in:

---[ end trace ea1cda33a86c8ca6 ]---
RIP: 0010:ext4_split_extent_at+0xe6e/0xe90 fs/ext4/extents.c:3181
Code: 48 89 df 48 89 74 24 68 e8 1f 80 d3 ff 48 8b 74 24 68 e9 5a fb ff ff e8 00 93 99 ff 0f 0b e8 f9 92 99 ff 0f 0b e8 f2 92 99 ff <0f> 0b e8 eb 92 99 ff 0f 0b e8 e4 92 99 ff 0f 0b e8 dd 92 99 ff 0f
RSP: 0018:ffffc90003f174a0 EFLAGS: 00010293
RAX: ffffffff81ca131e RBX: 0000000000000000 RCX: ffff888136410000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000002c
RBP: ffffc90003f17610 R08: 0000000000000000 R09: 0000000050000028
R10: ffffed1023a6c72a R11: 1ffff11023a6c728 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff11021315229 R15: 0000000000000000
FS:  00007f8535adb6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7503596ba0 CR3: 0000000119eb9000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400