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Date:   Sat, 10 Dec 2022 10:06:42 -0800
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Message-ID: <000000000000eb761405ef7d2113@google.com>
Subject: Re: [syzbot] WARNING in do_mkdirat
From:   syzbot <syzbot+919c5a9be8433b8bf201@syzkaller.appspotmail.com>
To:     dvyukov@google.com, elver@google.com, hdanton@sina.com,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, syzkaller-bugs@googlegroups.com,
        viro@zeniv.linux.org.uk, willy@infradead.org
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Precedence: bulk

syzbot has found a reproducer for the following issue on:

HEAD commit:    3ecc37918c80 Merge tag 'media/v6.1-4' of git://git.kernel...
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13ae071d880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d58e7fe7f9cf5e24
dashboard link: https://syzkaller.appspot.com/bug?extid=919c5a9be8433b8bf201
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=10aaf2b7880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17b652b7880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/be14794fd26b/disk-3ecc3791.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/35b850996388/vmlinux-3ecc3791.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0eec0f8f6777/bzImage-3ecc3791.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/547e98eae9c0/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+919c5a9be8433b8bf201@syzkaller.appspotmail.com

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DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff888072216a70, owner = 0x0, curr 0xffff888078ce57c0, list empty
WARNING: CPU: 0 PID: 4093 at kernel/locking/rwsem.c:1361 __up_write kernel/locking/rwsem.c:1360 [inline]
WARNING: CPU: 0 PID: 4093 at kernel/locking/rwsem.c:1361 up_write+0x4f9/0x580 kernel/locking/rwsem.c:1615
Modules linked in:
CPU: 0 PID: 4093 Comm: syz-executor196 Not tainted 6.1.0-rc8-syzkaller-00152-g3ecc37918c80 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:__up_write kernel/locking/rwsem.c:1360 [inline]
RIP: 0010:up_write+0x4f9/0x580 kernel/locking/rwsem.c:1615
Code: c7 c0 a3 ed 8a 48 c7 c6 60 a6 ed 8a 48 8b 54 24 28 48 8b 4c 24 18 4d 89 e0 4c 8b 4c 24 30 31 c0 53 e8 ab 7c e8 ff 48 83 c4 08 <0f> 0b e9 6b fd ff ff 48 c7 c1 18 2a 76 8e 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc900043ffd40 EFLAGS: 00010292
RAX: 7c48dcb6c422ab00 RBX: ffffffff8aeda4a0 RCX: ffff888078ce57c0
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc900043ffe10 R08: ffffffff816e5c7d R09: fffff5200087ff21
R10: fffff5200087ff21 R11: 1ffff9200087ff20 R12: 0000000000000000
R13: ffff888072216a70 R14: 1ffff9200087ffb0 R15: dffffc0000000000
FS:  00007f68743c0700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000026c1b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:761 [inline]
 done_path_create fs/namei.c:3857 [inline]
 do_mkdirat+0x2de/0x550 fs/namei.c:4064
 __do_sys_mkdirat fs/namei.c:4076 [inline]
 __se_sys_mkdirat fs/namei.c:4074 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4074
 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: 0033:0x7f687c635589
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:00007f68743c02f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f687c6d97b0 RCX: 00007f687c635589
RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000004
RBP: 00007f687c6d97bc R08: 00007f68743c0700 R09: 0000000000000000
R10: 00007f68743c0700 R11: 0000000000000246 R12: 00007f687c6a6258
R13: 0032656c69662f2e R14: 69662f7375622f2e R15: 00007f687c6d97b8
 </TASK>