Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_page_mkwrite (4)

[syzbot <syzbot+42984127d45ad96219de@syzkaller.appspotmail.com>]

syzbot has found a reproducer for the following issue on:

HEAD commit:    abf8c33470f7 Merge tag 'spi-fix-v7.4-merge-window' of git:..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14bd94b1580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4a49f7c2815c8df7
dashboard link: https://syzkaller.appspot.com/bug?extid=42984127d45ad96219de
compiler:       Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16bd94b1580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1170f04e580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-abf8c334.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2fa6d9134089/vmlinux-abf8c334.xz
kernel image: https://storage.googleapis.com/syzbot-assets/17b6a19466ca/bzImage-abf8c334.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/afd449083684/mount_1.gz
  fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=10bd94b1580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+42984127d45ad96219de@syzkaller.appspotmail.com

(syz.0.17,5578,0):__ocfs2_journal_access:730 ERROR: Error -30 getting 1 access to buffer!
(syz.0.17,5578,0):ocfs2_write_end_nolock:1945 ERROR: status = -30
------------[ cut here ]------------
kernel BUG at fs/ocfs2/mmap.c:106!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5578 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__ocfs2_page_mkwrite fs/ocfs2/mmap.c:106 [inline]
RIP: 0010:ocfs2_page_mkwrite+0xb59/0xb60 fs/ocfs2/mmap.c:143
Code: 50 42 fe e9 27 fd ff ff e8 44 4d 07 08 e8 5f af c9 fd 4c 89 e7 48 c7 c6 40 21 77 8c e8 00 af 28 fd 90 0f 0b e8 48 af c9 fd 90 <0f> 0b cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90001c3f960 EFLAGS: 00010293
RAX: ffffffff83ff77b8 RBX: 00000000ffffffe2 RCX: ffff88803c8ea580
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 00000000ffffffe2
RBP: ffffc90001c3faf0 R08: ffffffff91be13bf R09: 1ffffffff237c277
R10: dffffc0000000000 R11: fffffbfff237c278 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000001000
FS:  000055557db80500(0000) GS:ffff88808aa01000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6af90e5440 CR3: 0000000040472000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 do_page_mkwrite+0x147/0x310 mm/memory.c:3879
 do_shared_fault mm/memory.c:6145 [inline]
 do_fault mm/memory.c:6207 [inline]
 do_pte_missing+0x70f/0x3570 mm/memory.c:4763
 handle_pte_fault mm/memory.c:6627 [inline]
 __handle_mm_fault mm/memory.c:6776 [inline]
 handle_mm_fault+0x1a53/0x3750 mm/memory.c:6943
 do_user_addr_fault+0x7f6/0x1480 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: 0033:0x7f8bc2868b02
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:00007ffe54034e30 EFLAGS: 00010246
RAX: 0000200000000480 RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 000055557db803d8
RBP: 00007ffe54034f50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000000
R13: 00007f8bc2c25fac R14: 000000000001c34b R15: 00007f8bc2c25fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__ocfs2_page_mkwrite fs/ocfs2/mmap.c:106 [inline]
RIP: 0010:ocfs2_page_mkwrite+0xb59/0xb60 fs/ocfs2/mmap.c:143
Code: 50 42 fe e9 27 fd ff ff e8 44 4d 07 08 e8 5f af c9 fd 4c 89 e7 48 c7 c6 40 21 77 8c e8 00 af 28 fd 90 0f 0b e8 48 af c9 fd 90 <0f> 0b cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90001c3f960 EFLAGS: 00010293
RAX: ffffffff83ff77b8 RBX: 00000000ffffffe2 RCX: ffff88803c8ea580
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 00000000ffffffe2
RBP: ffffc90001c3faf0 R08: ffffffff91be13bf R09: 1ffffffff237c277
R10: dffffc0000000000 R11: fffffbfff237c278 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000001000
FS:  000055557db80500(0000) GS:ffff88808aa01000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005598dcb9a660 CR3: 0000000040472000 CR4: 0000000000352ef0


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