------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON(!is_rwsem_reader_owned(sem)): count = 0x0, magic = 0xffff888046b053f0, owner = 0x0, curr 0xffff88804a358000, list empty
WARNING: CPU: 1 PID: 6728 at kernel/locking/rwsem.c:1354 __up_read+0x5f6/0x750 kernel/locking/rwsem.c:1354
Modules linked in:
CPU: 1 UID: 0 PID: 6728 Comm: syz-executor.2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__up_read+0x5f6/0x750 kernel/locking/rwsem.c:1354
Code: 3c 02 00 0f 85 c0 00 00 00 49 8b 17 41 56 4c 89 e9 48 c7 c6 a0 64 ad 8b 4c 8b 4c 24 10 48 c7 c7 40 63 ad 8b e8 0b 1b e3 ff 90 <0f> 0b 90 90 59 e9 ff fa ff ff 48 c7 c7 50 7d ab 90 48 89 04 24 e8
RSP: 0018:ffffc90005787b48 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffffffff90ab7d50 RCX: ffffffff817a3358
RDX: ffff88804a358000 RSI: ffffffff817a3365 RDI: 0000000000000001
RBP: ffff888046b053f8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 1ffff92000af0f6d
R13: ffff888046b053f0 R14: ffffffff8bad6280 R15: ffff888046b053f0
FS:  00007f5395dc26c0(0000) GS:ffff8880d67b9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f85147d3000 CR3: 000000004aeb3000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 inode_unlock_shared include/linux/fs.h:894 [inline]
 lookup_slow fs/namei.c:1826 [inline]
 walk_component+0x35e/0x5b0 fs/namei.c:2129
 lookup_last fs/namei.c:2630 [inline]
 path_lookupat+0x142/0x6d0 fs/namei.c:2654
 filename_lookup+0x224/0x5f0 fs/namei.c:2683
 user_path_at+0x3a/0x60 fs/namei.c:3127
 __do_sys_chdir fs/open.c:561 [inline]
 __se_sys_chdir fs/open.c:555 [inline]
 __x64_sys_chdir+0xbe/0x270 fs/open.c:555
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f539507dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5395dc20c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000050
RAX: ffffffffffffffda RBX: 00007f53951ac050 RCX: 00007f539507dda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000380
RBP: 00007f53950ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f53951ac050 R15: 00007ffdc47667a8
 </TASK>