[syzbot] [ocfs2?] kernel BUG in ocfs2_write_begin_nolock (3)

[syzbot <syzbot+fd44623201beb5f3b462@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    4352b8aee980 Merge tag 'i3c/for-7.3' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14fc3549580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=335632b21d0ce540
dashboard link: https://syzkaller.appspot.com/bug?extid=fd44623201beb5f3b462
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/8491c9d0d35e/disk-4352b8ae.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/51cc3aee80d1/vmlinux-4352b8ae.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e0bcbebdbede/bzImage-4352b8ae.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fd44623201beb5f3b462@syzkaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at fs/ocfs2/aops.c:1391!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 7883 Comm: syz.6.469 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:ocfs2_populate_write_desc fs/ocfs2/aops.c:1391 [inline]
RIP: 0010:ocfs2_write_begin_nolock+0x41b2/0x41f0 fs/ocfs2/aops.c:1689
Code: 84 3a e3 fd 49 bf 00 00 00 00 00 fc ff df 4c 8b 24 24 e9 62 fe ff ff e8 7c 50 fc 07 e8 67 3a e3 fd 90 0f 0b e8 5f 3a e3 fd 90 <0f> 0b e8 57 3a e3 fd 90 0f 0b e8 4f 3a e3 fd 90 0f 0b e8 47 3a e3
RSP: 0018:ffffc900060df2e0 EFLAGS: 00010293
RAX: ffffffff83e3f321 RBX: ffff88802a26c010 RCX: ffff88802ec5be80
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffffc900060df880 R08: ffff88802ec5be80 R09: 0000000000000006
R10: 00000000fffffffc R11: 0000000000000000 R12: ffff88802a26c000
R13: 1ffff110041ec81f R14: 0000000000000003 R15: 0000000000000000
FS:  0000555591908500(0000) GS:ffff888124cf3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc5117ed158 CR3: 000000005a889000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __ocfs2_page_mkwrite fs/ocfs2/mmap.c:92 [inline]
 ocfs2_page_mkwrite+0x640/0xb60 fs/ocfs2/mmap.c:143
 do_page_mkwrite+0x147/0x310 mm/memory.c:3754
 wp_page_shared mm/memory.c:4155 [inline]
 do_wp_page+0x1a9c/0x4b80 mm/memory.c:4378
 handle_pte_fault mm/memory.c:6520 [inline]
 __handle_mm_fault mm/memory.c:6645 [inline]
 handle_mm_fault+0x1576/0x3720 mm/memory.c:6814
 do_user_addr_fault+0x746/0x1340 arch/x86/mm/fault.c:1394
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f5f73c67682
Code: 30 48 8b 14 24 48 85 d2 74 17 8b 44 24 10 0f c8 89 c0 48 89 44 24 10 48 83 fa 01 0f 85 aa 02 00 00 48 8b 44 24 18 8b 74 24 10 <89> 30 e9 1e fe ff ff 48 8b 44 24 18 8b 10 48 8b 04 24 48 85 c0 0f
RSP: 002b:00007ffd7d7d31a0 EFLAGS: 00010246
RAX: 0000200000000180 RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00005555919083d8
RBP: 00007ffd7d7d32c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00007ffd7d7d3300
R13: 00007f5f7402609c R14: 000000000002ae89 R15: 00007ffd7d7d32e0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_populate_write_desc fs/ocfs2/aops.c:1391 [inline]
RIP: 0010:ocfs2_write_begin_nolock+0x41b2/0x41f0 fs/ocfs2/aops.c:1689
Code: 84 3a e3 fd 49 bf 00 00 00 00 00 fc ff df 4c 8b 24 24 e9 62 fe ff ff e8 7c 50 fc 07 e8 67 3a e3 fd 90 0f 0b e8 5f 3a e3 fd 90 <0f> 0b e8 57 3a e3 fd 90 0f 0b e8 4f 3a e3 fd 90 0f 0b e8 47 3a e3
RSP: 0018:ffffc900060df2e0 EFLAGS: 00010293
RAX: ffffffff83e3f321 RBX: ffff88802a26c010 RCX: ffff88802ec5be80
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffffc900060df880 R08: ffff88802ec5be80 R09: 0000000000000006
R10: 00000000fffffffc R11: 0000000000000000 R12: ffff88802a26c000
R13: 1ffff110041ec81f R14: 0000000000000003 R15: 0000000000000000
FS:  0000555591908500(0000) GS:ffff888124cf3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc50359f6c CR3: 000000005a889000 CR4: 0000000000350ef0


---
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 syzkaller@googlegroups.com.

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