linux-kernel - [syzbot] [vfs?] [ntfs3?] [tmpfs?] WARNING in lookup

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Message-ID: <000000000000299cf505f02be9ef@google.com>
Date:   Mon, 19 Dec 2022 02:37:49 -0800
From:   syzbot <syzbot+7923cf13ed6110fc744d@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org,
        almaz.alexandrovich@...agon-software.com, hughd@...gle.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, ntfs3@...ts.linux.dev,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: [syzbot] [vfs?] [ntfs3?] [tmpfs?] WARNING in lookup_slow

Hello,

syzbot found the following issue on:

HEAD commit:    84e57d292203 Merge tag 'exfat-for-6.2-rc1' of git://git.ke..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1400b79d880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=35448eec2d733f7a
dashboard link: https://syzkaller.appspot.com/bug?extid=7923cf13ed6110fc744d
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1526a8f7880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13005d9f880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e387d46e5fde/disk-84e57d29.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/edcdbee22654/vmlinux-84e57d29.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f906e9373d31/bzImage-84e57d29.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/7e801c3092a5/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7923cf13ed6110fc744d@...kaller.appspotmail.com

------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON(!is_rwsem_reader_owned(sem)): count = 0x0, magic = 0xffff8880725a36d0, owner = 0x0, curr 0xffff888028060000, list empty
WARNING: CPU: 1 PID: 5283 at kernel/locking/rwsem.c:1336 __up_read+0x5ff/0x690 kernel/locking/rwsem.c:1336
Modules linked in:
CPU: 0 PID: 5283 Comm: syz-executor217 Not tainted 6.1.0-syzkaller-11674-g84e57d292203 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:__up_read+0x5ff/0x690 kernel/locking/rwsem.c:1336
Code: 44 d8 48 c7 c7 a0 ab ed 8a 48 c7 c6 40 ac ed 8a 48 8b 54 24 20 4c 89 f1 4d 89 f8 4d 89 e9 31 c0 53 e8 85 61 e8 ff 48 83 c4 08 <0f> 0b 48 bb 00 00 00 00 00 fc ff df 4c 8b 6c 24 18 e9 53 fb ff ff
RSP: 0018:ffffc90003fffa60 EFLAGS: 00010296
RAX: 9113eee468a99100 RBX: ffffffff8aedac80 RCX: ffff888028060000
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc90003fffb38 R08: ffffffff816f274d R09: fffff520007fff05
R10: fffff520007fff05 R11: 1ffff920007fff04 R12: ffff8880725a3728
R13: ffff888028060000 R14: ffff8880725a36d0 R15: 0000000000000000
FS:  00007f6f26a5d700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6f26a5d718 CR3: 000000001d340000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_unlock_shared include/linux/fs.h:771 [inline]
 lookup_slow+0x5e/0x70 fs/namei.c:1703
 walk_component+0x2e1/0x410 fs/namei.c:1993
 lookup_last fs/namei.c:2450 [inline]
 path_lookupat+0x17d/0x450 fs/namei.c:2474
 filename_lookup+0x274/0x650 fs/namei.c:2503
 user_path_at_empty+0x40/0x1a0 fs/namei.c:2876
 user_path_at include/linux/namei.h:57 [inline]
 __do_sys_chdir fs/open.c:514 [inline]
 __se_sys_chdir+0xb8/0x210 fs/open.c:508
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f6f2ecd2659
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 15 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:00007f6f26a5d2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000050
RAX: ffffffffffffffda RBX: 0000000000000032 RCX: 00007f6f2ecd2659
RDX: 00007f6f2ecd2659 RSI: ffffffffffffffb8 RDI: 0000000020000380
RBP: 00007f6f2ed76798 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6f2ed76790
R13: 00007f6f2ed7679c R14: 6174656d776f6873 R15: 0030656c69662f2e
 </TASK>


---
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