[syzbot] [xfs?] WARNING in xfs_bmapi_convert_delalloc (3)

Hello,

syzbot found the following issue on:

HEAD commit:    3708dd948844 Merge tag 'pm-7.2-rc6' of git://git.kernel.or..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13b597b1580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4e38b15c29e6a1d9
dashboard link: https://syzkaller.appspot.com/bug?extid=0ce92d16209e30011ebc
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/52be26782cb7/disk-3708dd94.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/75068ef5ea5b/vmlinux-3708dd94.xz
kernel image: https://storage.googleapis.com/syzbot-assets/cacb93088fbd/bzImage-3708dd94.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]

------------[ cut here ]------------
whichfork != XFS_COW_FORK
WARNING: fs/xfs/libxfs/xfs_bmap.c:4395 at xfs_bmapi_convert_one_delalloc fs/xfs/libxfs/xfs_bmap.c:4395 [inline], CPU#1: syz.5.576/8381
WARNING: fs/xfs/libxfs/xfs_bmap.c:4395 at xfs_bmapi_convert_delalloc+0x117b/0x1540 fs/xfs/libxfs/xfs_bmap.c:4501, CPU#1: syz.5.576/8381
Modules linked in:

CPU: 1 UID: 0 PID: 8381 Comm: syz.5.576 Tainted: G S           L      syzkaller #0 PREEMPT(full) 
Tainted: [S]=CPU_OUT_OF_SPEC, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:xfs_bmapi_convert_one_delalloc fs/xfs/libxfs/xfs_bmap.c:4395 [inline]
RIP: 0010:xfs_bmapi_convert_delalloc+0x117b/0x1540 fs/xfs/libxfs/xfs_bmap.c:4501
Code: df 31 f6 e8 a7 50 01 00 eb 05 e8 c0 ee 48 fe 48 8b bc 24 e0 01 00 00 e8 73 ce 1e 00 41 89 c4 e9 e0 f2 ff ff e8 a6 ee 48 fe 90 <0f> 0b 90 e9 bf f2 ff ff 44 89 e1 80 e1 07 38 c1 0f 8c 0e f1 ff ff
RSP: 0018:ffffc90005d86f60 EFLAGS: 00010287
RAX: ffffffff837e25ca RBX: 1ffff92000bb0e04 RCX: 0000000000080000
RDX: ffffc9000f6e3000 RSI: 00000000000004e1 RDI: 00000000000004e2
RBP: ffffc90005d871b0 R08: ffffc90005d87090 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000002 R12: 0000000000000002
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000bb0e04
FS:  00007fb5b0f8b6c0(0000) GS:ffff88812504d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34821ff8 CR3: 000000007d12c000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 xfs_buffered_write_iomap_begin+0xd50/0x2350 fs/xfs/xfs_iomap.c:2082
 iomap_iter+0x5f5/0xf80 fs/iomap/iter.c:110
 iomap_zero_range+0xb85/0xca0 fs/iomap/buffered-io.c:1762
 xfs_zero_range+0x9a/0x100 fs/xfs/xfs_iomap.c:2371
 xfs_file_write_zero_eof fs/xfs/xfs_file.c:443 [inline]
 xfs_file_write_checks+0x5f0/0xa80 fs/xfs/xfs_file.c:510
 xfs_file_buffered_write+0x19f/0x870 fs/xfs/xfs_file.c:1051
 aio_write+0x5cd/0x870 fs/aio.c:1687
 __io_submit_one fs/aio.c:-1 [inline]
 io_submit_one+0x798/0x13d0 fs/aio.c:2106
 __do_sys_io_submit fs/aio.c:2165 [inline]
 __se_sys_io_submit+0x195/0x340 fs/aio.c:2135
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb5b019e019
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:00007fb5b0f8b028 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 00007fb5b0426090 RCX: 00007fb5b019e019
RDX: 0000200000000540 RSI: 0000000000000008 RDI: 00007fb5b0f6a000
RBP: 00007fb5b023500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb5b0426128 R14: 00007fb5b0426090 R15: 00007ffd02aa14a8
 </TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at [email protected].

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup