------------[ cut here ]------------
kernel BUG at fs/ext4/extents.c:3186!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 476 Comm: syz.2.16 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:ext4_split_extent_at+0xe5a/0xe80 fs/ext4/extents.c:3186
Code: 6c 76 d3 ff e9 d1 fb ff ff 89 d9 80 e1 07 fe c1 38 c1 0f 8c de fb ff ff 48 89 df e8 30 76 d3 ff e9 d1 fb ff ff e8 96 f4 94 ff <0f> 0b e8 8f f4 94 ff 0f 0b e8 88 f4 94 ff 0f 0b e8 81 f4 94 ff 0f
RSP: 0018:ffffc90000be7940 EFLAGS: 00010293
RAX: ffffffff81d3ca4a RBX: 0000000000000000 RCX: ffff888117b63b40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc90000be7ab0 R08: 0000000000000000 R09: 0000000050000028
R10: ffffed1022c5e04a R11: 1ffff11022c5e048 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000030 R15: 0000000000000000
FS:  00007fd66032f6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000032000 CR3: 000000012ed86000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_force_split_extent_at fs/ext4/extents.c:319 [inline]
 ext4_ext_remove_space+0x64b/0x4180 fs/ext4/extents.c:2880
 ext4_punch_hole+0x77c/0xbd0 fs/ext4/inode.c:4137
 ext4_fallocate+0x2b6/0x1de0 fs/ext4/extents.c:4765
 vfs_fallocate+0x4b4/0x590 fs/open.c:309
 ksys_fallocate fs/open.c:332 [inline]
 __do_sys_fallocate fs/open.c:340 [inline]
 __se_sys_fallocate fs/open.c:338 [inline]
 __x64_sys_fallocate+0xc0/0x110 fs/open.c:338
 x64_sys_call+0x7ec/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:286
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fd6608df969
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:00007fd66032f038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fd660b07080 RCX: 00007fd6608df969
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 00007fd660961ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001a00 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd660b07080 R15: 00007ffddb92d368
 </TASK>
Modules linked in:
---[ end trace 44d6abea335fe39d ]---
RIP: 0010:ext4_split_extent_at+0xe5a/0xe80 fs/ext4/extents.c:3186
Code: 6c 76 d3 ff e9 d1 fb ff ff 89 d9 80 e1 07 fe c1 38 c1 0f 8c de fb ff ff 48 89 df e8 30 76 d3 ff e9 d1 fb ff ff e8 96 f4 94 ff <0f> 0b e8 8f f4 94 ff 0f 0b e8 88 f4 94 ff 0f 0b e8 81 f4 94 ff 0f
RSP: 0018:ffffc90000be7940 EFLAGS: 00010293
RAX: ffffffff81d3ca4a RBX: 0000000000000000 RCX: ffff888117b63b40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc90000be7ab0 R08: 0000000000000000 R09: 0000000050000028
R10: ffffed1022c5e04a R11: 1ffff11022c5e048 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000030 R15: 0000000000000000
FS:  00007fd66032f6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000032000 CR3: 000000012ed86000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400