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kernel BUG at fs/ext4/extents.c:3181!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 479 Comm: syz.2.16 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:ext4_split_extent_at+0xe6e/0xe90 fs/ext4/extents.c:3181
Code: 48 89 df 48 89 74 24 68 e8 1f 7e d3 ff 48 8b 74 24 68 e9 5a fb ff ff e8 b0 8e 99 ff 0f 0b e8 a9 8e 99 ff 0f 0b e8 a2 8e 99 ff <0f> 0b e8 9b 8e 99 ff 0f 0b e8 94 8e 99 ff 0f 0b e8 8d 8e 99 ff 0f
RSP: 0018:ffffc900027a7900 EFLAGS: 00010293
RAX: ffffffff81ca176e RBX: 0000000000000000 RCX: ffff8881171e93c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc900027a7a70 R08: 0000000000000000 R09: 0000000050000028
R10: ffffed1022ce282a R11: 1ffff11022ce2828 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff11024d147ff R15: 0000000000000000
FS:  00007fa8c2fa26c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa8c2fa2d58 CR3: 0000000116efa000 CR4: 00000000003506b0
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
 ksys_fallocate fs/open.c:333 [inline]
 __do_sys_fallocate fs/open.c:341 [inline]
 __se_sys_fallocate fs/open.c:339 [inline]
 __x64_sys_fallocate+0xc0/0x110 fs/open.c:339
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fa8c3550de9
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:00007fa8c2fa2038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fa8c376a080 RCX: 00007fa8c3550de9
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 00007fa8c35d22a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001a00 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa8c376a080 R15: 00007ffe0fb31e78
Modules linked in:
---[ end trace 3e879b2c99fde65d ]---
RIP: 0010:ext4_split_extent_at+0xe6e/0xe90 fs/ext4/extents.c:3181
Code: 48 89 df 48 89 74 24 68 e8 1f 7e d3 ff 48 8b 74 24 68 e9 5a fb ff ff e8 b0 8e 99 ff 0f 0b e8 a9 8e 99 ff 0f 0b e8 a2 8e 99 ff <0f> 0b e8 9b 8e 99 ff 0f 0b e8 94 8e 99 ff 0f 0b e8 8d 8e 99 ff 0f
RSP: 0018:ffffc900027a7900 EFLAGS: 00010293
RAX: ffffffff81ca176e RBX: 0000000000000000 RCX: ffff8881171e93c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc900027a7a70 R08: 0000000000000000 R09: 0000000050000028
R10: ffffed1022ce282a R11: 1ffff11022ce2828 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff11024d147ff R15: 0000000000000000
FS:  00007fa8c2fa26c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa8c2fa2d58 CR3: 0000000116efa000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400