linux-kernel - Re: [syzbot] [exfat?] [ocfs2?] kernel BUG in link_path

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Message-ID: <69395726.a70a0220.33cd7b.0006.GAE@google.com>
Date: Wed, 10 Dec 2025 03:19:02 -0800
From: syzbot <syzbot+d222f4b7129379c3d5bc@...kaller.appspotmail.com>
To: brauner@...nel.org, jack@...e.cz, jlbec@...lplan.org, 
	joseph.qi@...ux.alibaba.com, linkinjeon@...nel.org, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, mark@...heh.com, 
	mjguzik@...il.com, ocfs2-devel@...ts.linux.dev, sj1557.seo@...sung.com, 
	syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: [syzbot] [exfat?] [ocfs2?] kernel BUG in link_path_walk

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in ocfs2_journal_toggle_dirty

(syz.0.554,7359,0):ocfs2_assign_bh:2417 ERROR: status = -30
(syz.0.554,7359,0):ocfs2_inode_lock_full_nested:2512 ERROR: status = -30
(syz.0.554,7359,0):ocfs2_shutdown_local_alloc:412 ERROR: status = -30
------------[ cut here ]------------
kernel BUG at fs/ocfs2/journal.c:1027!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 7359 Comm: syz.0.554 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:ocfs2_journal_toggle_dirty+0x33f/0x350 fs/ocfs2/journal.c:1027
Code: ff ff e8 44 bf b0 07 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 4e fe ff ff 48 89 df e8 fc 5a 7d fe e9 41 fe ff ff e8 f2 7e 15 fe 90 <0f> 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffc9000d436fc0 EFLAGS: 00010293
RAX: ffffffff83ac415e RBX: 00000000ffffffff RCX: ffff88803ae90000
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: ffffc9000d437070 R08: ffffffff8fa21977 R09: 1ffffffff1f4432e
R10: dffffc0000000000 R11: fffffbfff1f4432f R12: 1ffff110024dca22
R13: ffff88804353b600 R14: ffff888011a24000 R15: ffff8880126e5110
FS:  00007ff6959f66c0(0000) GS:ffff88808d22f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3a33db2000 CR3: 000000005209e000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_journal_shutdown+0x524/0xab0 fs/ocfs2/journal.c:1109
 ocfs2_mount_volume fs/ocfs2/super.c:1785 [inline]
 ocfs2_fill_super+0x5574/0x63a0 fs/ocfs2/super.c:1083
 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691
 vfs_get_tree+0x92/0x2a0 fs/super.c:1751
 fc_mount fs/namespace.c:1199 [inline]
 do_new_mount_fc fs/namespace.c:3636 [inline]
 do_new_mount+0x302/0xa10 fs/namespace.c:3712
 do_mount fs/namespace.c:4035 [inline]
 __do_sys_mount fs/namespace.c:4224 [inline]
 __se_sys_mount+0x313/0x410 fs/namespace.c:4201
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff696390f6a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff6959f5e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ff6959f5ef0 RCX: 00007ff696390f6a
RDX: 0000200000004440 RSI: 0000200000000040 RDI: 00007ff6959f5eb0
RBP: 0000200000004440 R08: 00007ff6959f5ef0 R09: 00000000000008c0
R10: 00000000000008c0 R11: 0000000000000246 R12: 0000200000000040
R13: 00007ff6959f5eb0 R14: 0000000000004421 R15: 0000200000000080
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_journal_toggle_dirty+0x33f/0x350 fs/ocfs2/journal.c:1027
Code: ff ff e8 44 bf b0 07 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 4e fe ff ff 48 89 df e8 fc 5a 7d fe e9 41 fe ff ff e8 f2 7e 15 fe 90 <0f> 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffc9000d436fc0 EFLAGS: 00010293
RAX: ffffffff83ac415e RBX: 00000000ffffffff RCX: ffff88803ae90000
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: ffffc9000d437070 R08: ffffffff8fa21977 R09: 1ffffffff1f4432e
R10: dffffc0000000000 R11: fffffbfff1f4432f R12: 1ffff110024dca22
R13: ffff88804353b600 R14: ffff888011a24000 R15: ffff8880126e5110
FS:  00007ff6959f66c0(0000) GS:ffff88808d22f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa8e1fff000 CR3: 000000005209e000 CR4: 0000000000352ef0


Tested on:

commit:         0048fbb4 Merge tag 'locking-futex-2025-12-10' of git:/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1477da1a580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=de48dccdf203ea90
dashboard link: https://syzkaller.appspot.com/bug?extid=d222f4b7129379c3d5bc
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=11e2ea1a580000