[fs?] WARNING in iterate_dir

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: f6feea56f66d Merge tag 'mm-hotfixes-stable-2023-02-13-13-5..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=135631c7480000
kernel config: https://syzkaller.appspot.com/x/.config?x=42ba4da8e1e6af9f
dashboard link: https://syzkaller.appspot.com/bug?extid=184ec59f662f4e76ab4d
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
CC: [linux-...@vger.kernel.org linux-...@vger.kernel.org vi...@zeniv.linux.org.uk]

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/1ae0143f08d5/disk-f6feea56.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/18b8a23fa0cb/vmlinux-f6feea56.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d915f4c5c8c0/bzImage-f6feea56.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+184ec5...@syzkaller.appspotmail.com

------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON(!is_rwsem_reader_owned(sem)): count = 0x0, magic = 0xffff88802fa1ea70, owner = 0x0, curr 0xffff888027403a80, list empty
WARNING: CPU: 0 PID: 9444 at kernel/locking/rwsem.c:1336 __up_read+0x5dc/0x670 kernel/locking/rwsem.c:1336
Modules linked in:
CPU: 0 PID: 9444 Comm: syz-executor.5 Not tainted 6.2.0-rc8-syzkaller-00015-gf6feea56f66d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
RIP: 0010:__up_read+0x5dc/0x670 kernel/locking/rwsem.c:1336
Code: ea 8a 48 0f 44 c1 48 c7 c7 80 61 ea 8a 48 c7 c6 20 62 ea 8a 4c 89 fa 4c 89 f1 49 89 d8 4d 89 e9 50 e8 28 9a e8 ff 48 83 c4 08 <0f> 0b 48 bb 00 00 00 00 00 fc ff df 4c 8b 2c 24 e9 74 fb ff ff 48
RSP: 0018:ffffc90004bcfcc0 EFLAGS: 00010296
RAX: 0a7ee3c7db8bde00 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc9000aea1000 RSI: 000000000000c401 RDI: 000000000000c402
RBP: ffffc90004bcfd68 R08: ffffffff816ef9ec R09: fffff52000979f51
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88802fa1eac8
R13: ffff888027403a80 R14: ffff88802fa1ea70 R15: 0000000000000000
FS: 00007f9dd0ffe700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f779d5fe000 CR3: 0000000029f74000 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]
iterate_dir+0x4b0/0x570 fs/readdir.c:73
__do_sys_getdents fs/readdir.c:286 [inline]
__se_sys_getdents+0x1ef/0x4c0 fs/readdir.c:271
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: 0033:0x7f9dda68c0f9
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:00007f9dd0ffe168 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007f9dda7ac050 RCX: 00007f9dda68c0f9
RDX: 0000000000000070 RSI: 0000000020000340 RDI: 0000000000000005
RBP: 00007f9dda6e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffea73ed2bf R14: 00007f9dd0ffe300 R15: 0000000000022000
</TASK>


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.