loop2: detected capacity change from 0 to 40427
F2FS-fs (loop2): invalid crc value
F2FS-fs (loop2): Found nat_bits in checkpoint
F2FS-fs (loop2): Mounted with checkpoint version = 48b305e5
------------[ cut here ]------------
kernel BUG at fs/f2fs/segment.c:3481!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 5979 Comm: syz.2.19 Not tainted 6.6.102-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:f2fs_allocate_data_block+0x3f08/0x3f50 fs/f2fs/segment.c:3481
Code: 21 fe 48 8b 54 24 30 e9 c6 eb ff ff e8 21 51 ca fd 48 c7 c7 f0 cd 2f 8d 4c 89 f6 e8 d2 e5 95 00 e9 e2 eb ff ff e8 08 51 ca fd <0f> 0b e8 01 51 ca fd 0f 0b e8 fa 50 ca fd 0f 0b e8 f3 50 ca fd 0f
RSP: 0018:ffffc9000502f830 EFLAGS: 00010283
RAX: ffffffff83bb3a18 RBX: 0000000000000201 RCX: 0000000000080000
RDX: ffffc9000d88b000 RSI: 0000000000026e6d RDI: 0000000000026e6e
RBP: 0000000000000200 R08: ffff88802c91685f R09: 1ffff11005922d0b
R10: dffffc0000000000 R11: ffffed1005922d0c R12: 1ffff92000a05f7c
R13: 0000000000000000 R14: 0000000000002401 R15: dffffc0000000000
FS:  00007fb16bb616c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e805ff8 CR3: 0000000074cef000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 __allocate_data_block fs/f2fs/data.c:1421 [inline]
 f2fs_map_blocks+0x1301/0x3d60 fs/f2fs/data.c:1604
 f2fs_expand_inode_data+0x5c2/0x970 fs/f2fs/file.c:1837
 f2fs_fallocate+0x416/0x8a0 fs/f2fs/file.c:1940
 vfs_fallocate+0x58e/0x700 fs/open.c:324
 ksys_fallocate fs/open.c:347 [inline]
 __do_sys_fallocate fs/open.c:355 [inline]
 __se_sys_fallocate fs/open.c:353 [inline]
 __x64_sys_fallocate+0xc1/0x110 fs/open.c:353
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb16ad8ebe9
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:00007fb16bb61038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fb16afb5fa0 RCX: 00007fb16ad8ebe9
RDX: 000000000000fc01 RSI: 0000000000000000 RDI: 000000000000000a
RBP: 00007fb16ae11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000001000f4 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb16afb6038 R14: 00007fb16afb5fa0 R15: 00007ffd24a6afa8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:f2fs_allocate_data_block+0x3f08/0x3f50 fs/f2fs/segment.c:3481
Code: 21 fe 48 8b 54 24 30 e9 c6 eb ff ff e8 21 51 ca fd 48 c7 c7 f0 cd 2f 8d 4c 89 f6 e8 d2 e5 95 00 e9 e2 eb ff ff e8 08 51 ca fd <0f> 0b e8 01 51 ca fd 0f 0b e8 fa 50 ca fd 0f 0b e8 f3 50 ca fd 0f
RSP: 0018:ffffc9000502f830 EFLAGS: 00010283
RAX: ffffffff83bb3a18 RBX: 0000000000000201 RCX: 0000000000080000
RDX: ffffc9000d88b000 RSI: 0000000000026e6d RDI: 0000000000026e6e
RBP: 0000000000000200 R08: ffff88802c91685f R09: 1ffff11005922d0b
R10: dffffc0000000000 R11: ffffed1005922d0c R12: 1ffff92000a05f7c
R13: 0000000000000000 R14: 0000000000002401 R15: dffffc0000000000
FS:  00007fb16bb616c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e805ff8 CR3: 0000000074cef000 CR4: 00000000003506e0