[syzbot] [ocfs2?] kernel BUG in ocfs2_write_begin_nolock

[syzbot <syzbot+7c88f40b30ec95353951@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    2d5404caa8c7 Linux 6.12-rc7
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=133a335f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1503500c6f615d24
dashboard link: https://syzkaller.appspot.com/bug?extid=7c88f40b30ec95353951
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a2d329b82126/disk-2d5404ca.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/37a04ca225dd/vmlinux-2d5404ca.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4f837ce9d9dc/bzImage-2d5404ca.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7c88f40b30ec95353951@syzkaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at fs/ocfs2/aops.c:1410!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 6836 Comm: syz.6.125 Not tainted 6.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:ocfs2_populate_write_desc fs/ocfs2/aops.c:1410 [inline]
RIP: 0010:ocfs2_write_begin_nolock+0x4da3/0x4ec0 fs/ocfs2/aops.c:1707
Code: e8 92 d7 11 fe 48 89 df e8 da 60 0f 00 e9 b5 fc ff ff e8 80 d7 11 fe e9 ab fc ff ff e8 76 d7 11 fe 90 0f 0b e8 6e d7 11 fe 90 <0f> 0b e8 66 d7 11 fe 90 0f 0b e8 5e d7 11 fe 90 0f 0b e8 56 d7 11
RSP: 0000:ffffc90004466f60 EFLAGS: 00010293
RAX: ffffffff83830242 RBX: 0000000000000002 RCX: ffff88801e743c00
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffffc90004467540 R08: ffffffff8382c05f R09: ffffffff8382c025
R10: 0000000000000006 R11: ffff88801e743c00 R12: 0000000000000000
R13: 1ffff1100ffea802 R14: 0000000000000000 R15: 0000000000000000
FS:  000055559101b500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 0000000034ff8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __ocfs2_page_mkwrite fs/ocfs2/mmap.c:93 [inline]
 ocfs2_page_mkwrite+0x752/0xed0 fs/ocfs2/mmap.c:144
 do_page_mkwrite+0x198/0x480 mm/memory.c:3162
 wp_page_shared mm/memory.c:3563 [inline]
 do_wp_page+0x23d3/0x52d0 mm/memory.c:3713
 handle_pte_fault+0x10e3/0x6820 mm/memory.c:5782
 __handle_mm_fault mm/memory.c:5909 [inline]
 handle_mm_fault+0x1053/0x1ad0 mm/memory.c:6077
 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7fb6b79461d8
Code: fc 89 37 c3 c5 fa 6f 06 c5 fa 6f 4c 16 f0 c5 fa 7f 07 c5 fa 7f 4c 17 f0 c3 66 0f 1f 84 00 00 00 00 00 48 8b 4c 16 f8 48 8b 36 <48> 89 37 48 89 4c 17 f8 c3 c5 fe 6f 54 16 e0 c5 fe 6f 5c 16 c0 c5
RSP: 002b:00007ffc5c043b08 EFLAGS: 00010206
RAX: 0000000020000000 RBX: 0000000000000004 RCX: 006c7274635f6962
RDX: 000000000000000e RSI: 6962752f7665642f RDI: 0000000020000000
RBP: 00007fb6b7b37a80 R08: 00007fb6b7800000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000009 R12: 000000000001ceeb
R13: 00007ffc5c043c10 R14: 0000000000000032 R15: fffffffffffffffe
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_populate_write_desc fs/ocfs2/aops.c:1410 [inline]
RIP: 0010:ocfs2_write_begin_nolock+0x4da3/0x4ec0 fs/ocfs2/aops.c:1707
Code: e8 92 d7 11 fe 48 89 df e8 da 60 0f 00 e9 b5 fc ff ff e8 80 d7 11 fe e9 ab fc ff ff e8 76 d7 11 fe 90 0f 0b e8 6e d7 11 fe 90 <0f> 0b e8 66 d7 11 fe 90 0f 0b e8 5e d7 11 fe 90 0f 0b e8 56 d7 11
RSP: 0000:ffffc90004466f60 EFLAGS: 00010293
RAX: ffffffff83830242 RBX: 0000000000000002 RCX: ffff88801e743c00
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffffc90004467540 R08: ffffffff8382c05f R09: ffffffff8382c025
R10: 0000000000000006 R11: ffff88801e743c00 R12: 0000000000000000
R13: 1ffff1100ffea802 R14: 0000000000000000 R15: 0000000000000000
FS:  000055559101b500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa88b6763b0 CR3: 0000000034ff8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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