F2FS-fs (loop3): Found nat_bits in checkpoint
F2FS-fs (loop3): Start checkpoint disabled!
F2FS-fs (loop3): Mounted with checkpoint version = 48b305e6
------------[ cut here ]------------
kernel BUG at fs/f2fs/segment.c:3481!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 7590 Comm: syz.3.477 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:f2fs_allocate_data_block+0x3f6f/0x3fb0 fs/f2fs/segment.c:3481
Code: 1a fe 48 8b 54 24 30 e9 88 eb ff ff e8 6a 01 c2 fd 48 c7 c7 90 e5 6f 8d 4c 89 f6 e8 fb 76 97 00 e9 a4 eb ff ff e8 51 01 c2 fd <0f> 0b e8 4a 01 c2 fd 0f 0b e8 43 01 c2 fd 0f 0b e8 3c 01 c2 fd 0f
RSP: 0018:ffffc900033e7410 EFLAGS: 00010287
RAX: ffffffff83c5135f RBX: 0000000000000201 RCX: 0000000000080000
RDX: ffffc9000cb89000 RSI: 000000000002ab94 RDI: 000000000002ab95
RBP: 0000000000000200 R08: ffff888026310c5f R09: 1ffff11004c6218b
R10: dffffc0000000000 R11: ffffed1004c6218c R12: 1ffff9200067cef8
R13: 0000000000000000 R14: 0000000000001a01 R15: dffffc0000000000
FS:  00007f71d9afc6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f388620e000 CR3: 0000000069bb5000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 __allocate_data_block fs/f2fs/data.c:1421 [inline]
 f2fs_map_blocks+0x1338/0x3e60 fs/f2fs/data.c:1604
 f2fs_expand_inode_data+0x67a/0xa10 fs/f2fs/file.c:1851
 f2fs_fallocate+0x416/0x890 fs/f2fs/file.c:1954
 vfs_fallocate+0x58e/0x700 fs/open.c:324
 ioctl_preallocate fs/ioctl.c:291 [inline]
 file_ioctl fs/ioctl.c:331 [inline]
 do_vfs_ioctl+0x19f6/0x1cc0 fs/ioctl.c:850
 __do_sys_ioctl fs/ioctl.c:869 [inline]
 __se_sys_ioctl+0x83/0x170 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f71d8b9aeb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f71d9afc028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f71d8e15fa0 RCX: 00007f71d8b9aeb9
RDX: 00002000000000c0 RSI: 0000000040305828 RDI: 0000000000000004
RBP: 00007f71d8c08c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f71d8e16038 R14: 00007f71d8e15fa0 R15: 00007ffd0c560c08
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:f2fs_allocate_data_block+0x3f6f/0x3fb0 fs/f2fs/segment.c:3481
Code: 1a fe 48 8b 54 24 30 e9 88 eb ff ff e8 6a 01 c2 fd 48 c7 c7 90 e5 6f 8d 4c 89 f6 e8 fb 76 97 00 e9 a4 eb ff ff e8 51 01 c2 fd <0f> 0b e8 4a 01 c2 fd 0f 0b e8 43 01 c2 fd 0f 0b e8 3c 01 c2 fd 0f
RSP: 0018:ffffc900033e7410 EFLAGS: 00010287
RAX: ffffffff83c5135f RBX: 0000000000000201 RCX: 0000000000080000
RDX: ffffc9000cb89000 RSI: 000000000002ab94 RDI: 000000000002ab95
RBP: 0000000000000200 R08: ffff888026310c5f R09: 1ffff11004c6218b
R10: dffffc0000000000 R11: ffffed1004c6218c R12: 1ffff9200067cef8
R13: 0000000000000000 R14: 0000000000001a01 R15: dffffc0000000000
FS:  00007f71d9afc6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f742abe4198 CR3: 0000000069bb5000 CR4: 00000000003506e0