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Date:   Thu, 01 Dec 2022 19:18:45 -0800
Message-ID: <000000000000a0d7f305eecfcbb9@google.com>
Subject: [syzbot] WARNING in path_openat
From:   syzbot <syzbot+be8872fcb764bf9fea73@syzkaller.appspotmail.com>
To:     linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk
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Hello,

syzbot found the following issue on:

HEAD commit:    cf562a45a0d5 Merge tag 'pull-fixes' of git://git.kernel.or..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1673fbc9880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8d01b6e3197974dd
dashboard link: https://syzkaller.appspot.com/bug?extid=be8872fcb764bf9fea73
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6a92dc058341/disk-cf562a45.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c320c2307225/vmlinux-cf562a45.xz
kernel image: https://storage.googleapis.com/syzbot-assets/00049e41b3c5/bzImage-cf562a45.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+be8872fcb764bf9fea73@syzkaller.appspotmail.com

------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff8880471d2810, owner = 0x0, curr 0xffff88802277d7c0, list empty
WARNING: CPU: 0 PID: 16685 at kernel/locking/rwsem.c:1361 __up_write kernel/locking/rwsem.c:1360 [inline]
WARNING: CPU: 0 PID: 16685 at kernel/locking/rwsem.c:1361 up_write+0x4f9/0x580 kernel/locking/rwsem.c:1615
Modules linked in:
CPU: 0 PID: 16685 Comm: syz-executor.0 Not tainted 6.1.0-rc6-syzkaller-00375-gcf562a45a0d5 #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 40 a3 ed 8a 48 c7 c6 e0 a5 ed 8a 48 8b 54 24 28 48 8b 4c 24 18 4d 89 e0 4c 8b 4c 24 30 31 c0 53 e8 1b 83 e8 ff 48 83 c4 08 <0f> 0b e9 6b fd ff ff 48 c7 c1 98 24 76 8e 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000599f840 EFLAGS: 00010292
RAX: 98ee50892e908100 RBX: ffffffff8aeda420 RCX: 0000000000040000
RDX: ffffc90003f31000 RSI: 0000000000017f88 RDI: 0000000000017f89
RBP: ffffc9000599f910 R08: ffffffff816e560d R09: fffff52000b33ec1
R10: fffff52000b33ec1 R11: 1ffff92000b33ec0 R12: 0000000000000000
R13: ffff8880471d2810 R14: 1ffff92000b33f10 R15: dffffc0000000000
FS:  00007f50de06a700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb16bd60000 CR3: 0000000051e09000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:761 [inline]
 open_last_lookups fs/namei.c:3485 [inline]
 path_openat+0x1523/0x2df0 fs/namei.c:3711
 do_filp_open+0x264/0x4f0 fs/namei.c:3741
 do_sys_openat2+0x124/0x4e0 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_open fs/open.c:1334 [inline]
 __se_sys_open fs/open.c:1330 [inline]
 __x64_sys_open+0x221/0x270 fs/open.c:1330
 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: 0033:0x7f50dd28c0d9
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:00007f50de06a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f50dd3ac050 RCX: 00007f50dd28c0d9
RDX: 0000000000000000 RSI: 0000000000903c40 RDI: 0000000020000040
RBP: 00007f50dd2e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd1167814f R14: 00007f50de06a300 R15: 0000000000022000
 </TASK>


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