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Date:   Fri, 05 May 2023 01:32:29 -0700
In-Reply-To: <20230505075628.4150-1-hdanton@sina.com>
Message-ID: <0000000000002bf72005faee211a@google.com>
Subject: Re: [syzbot] [reiserfs?] possible deadlock in open_xa_dir
From:   syzbot <syzbot+8fb64a61fdd96b50f3b8@syzkaller.appspotmail.com>
To:     hdanton@sina.com, linux-kernel@vger.kernel.org,
        syzkaller-bugs@googlegroups.com
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Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in reiserfs_check_lock_depth

REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using r5 hash to sort names
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5415 at fs/reiserfs/lock.c:91 reiserfs_check_lock_depth+0x71/0x90
Modules linked in:
CPU: 1 PID: 5415 Comm: syz-executor.0 Not tainted 6.3.0-syzkaller-13164-g78b421b6a7c6-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
RIP: 0010:reiserfs_check_lock_depth+0x71/0x90 fs/reiserfs/lock.c:91
Code: 03 42 0f b6 04 38 84 c0 75 24 41 8b 1e 31 ff 89 de e8 a3 4f 58 ff 85 db 78 0b e8 ea 4b 58 ff 5b 41 5e 41 5f c3 e8 df 4b 58 ff <0f> 0b eb f1 44 89 f1 80 e1 07 80 c1 03 38 c1 7c cf 4c 89 f7 e8 86
RSP: 0018:ffffc9000581f520 EFLAGS: 00010293
RAX: ffffffff82334431 RBX: 00000000ffffffff RCX: ffff888025ed0000
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: ffffc9000581f7b0 R08: ffffffff8233441d R09: ffffed100e877044
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000b03f05
R13: dffffc0000000000 R14: ffff88807783b0c0 R15: dffffc0000000000
FS:  00007f9491058700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f62321d1ff8 CR3: 000000002a3c7000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_journal_end+0x20f/0x4770 fs/reiserfs/journal.c:4018
 reiserfs_create+0x68e/0x710 fs/reiserfs/namei.c:694
 lookup_open fs/namei.c:3492 [inline]
 open_last_lookups fs/namei.c:3560 [inline]
 path_openat+0x13df/0x3170 fs/namei.c:3788
 do_filp_open+0x234/0x490 fs/namei.c:3818
 do_sys_openat2+0x13f/0x500 fs/open.c:1356
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_openat fs/open.c:1388 [inline]
 __se_sys_openat fs/open.c:1383 [inline]
 __x64_sys_openat+0x247/0x290 fs/open.c:1383
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f949028c169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9491058168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f94903abf80 RCX: 00007f949028c169
RDX: 000000000000275a RSI: 0000000020000080 RDI: ffffffffffffff9c
RBP: 00007f94902e7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff4aaf8b4f R14: 00007f9491058300 R15: 0000000000022000
 </TASK>


Tested on:

commit:         78b421b6 Merge tag 'linux-watchdog-6.4-rc1' of git://w..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=1271004c280000
kernel config:  https://syzkaller.appspot.com/x/.config?x=73a06f6ef2d5b492
dashboard link: https://syzkaller.appspot.com/bug?extid=8fb64a61fdd96b50f3b8
compiler:       Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1194d2f4280000