[syzbot] [fs?] general protection fault in iter_file_splice_write

[syzbot]

syzbot suspects this issue was fixed by commit:

commit a3de58b12ce074ec05b8741fa28d62ccb1070468
Author: David Howells <dhowells at redhat.com>
Date:   Thu Aug 14 21:45:50 2025 +0000

    netfs: Fix unbuffered write error handling

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=162dc142580000
start commit:   5189dafa4cf9 Merge tag 'nfsd-6.11-1' of git://git.kernel.o..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=e8a2eef9745ade09
dashboard link: https://syzkaller.appspot.com/bug?extid=d2125fcb6aa8c4276fd2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16828c5d980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=103c7805980000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: netfs: Fix unbuffered write error handling

For information about bisection process see: https://goo.gl/tpsmEJ#bisection