------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON(!is_rwsem_reader_owned(sem)): count = 0x1, magic = 0xffff88804a72f318, owner = 0xffff88802bea8000, curr 0xffff88802a34ca80, list not empty
WARNING: kernel/locking/rwsem.c:1384 at __up_read+0x1b1/0x6e0 kernel/locking/rwsem.c:1384, CPU#0: syz-executor.2/6729
Modules linked in:
CPU: 0 UID: 0 PID: 6729 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 04/01/2014
RIP: 0010:__up_read+0x1c5/0x6e0 kernel/locking/rwsem.c:1384
Code: ea 03 80 3c 02 00 0f 85 e1 04 00 00 49 8b 17 48 8d 3d 0f b0 f6 0e 41 56 65 4c 8b 0d ed 0e 26 12 4c 89 e9 48 c7 c6 a0 cb af 8b <67> 48 0f b9 3a e8 51 23 12 03 5e bf 01 00 00 00 e8 a6 2c f1 ff be
RSP: 0018:ffffc9000680fb48 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88804a72f320 RCX: ffff88804a72f318
RDX: 0000000000000001 RSI: ffffffff8bafcba0 RDI: ffffffff90da7130
RBP: ffffffff90d740e0 R08: ffff88802bea8000 R09: ffff88802a34ca80
R10: ffff88804a72f31f R11: 0000000000000000 R12: 1ffff92000d01f6c
R13: ffff88804a72f318 R14: ffffffff8bafc940 R15: ffff88804a72f318
FS:  00007f1a9de126c0(0000) GS:ffff8880d6383000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000031d18000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 inode_unlock_shared include/linux/fs.h:1054 [inline]
 lookup_slow+0x5b/0x70 fs/namei.c:1933
 walk_component fs/namei.c:2278 [inline]
 lookup_last fs/namei.c:2785 [inline]
 path_lookupat+0x5e8/0xc40 fs/namei.c:2809
 filename_lookup+0x202/0x590 fs/namei.c:2838
 __do_sys_chdir fs/open.c:557 [inline]
 __se_sys_chdir fs/open.c:550 [inline]
 __x64_sys_chdir+0xc8/0x280 fs/open.c:550
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1a9d06e3b9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 d0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1a9de12078 EFLAGS: 00000246 ORIG_RAX: 0000000000000050
RAX: ffffffffffffffda RBX: 00007f1a9d1ac050 RCX: 00007f1a9d06e3b9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000380
RBP: 00007f1a9d0cf498 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f1a9d1ac050 R15: 00007ffc79450d98
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   4:	0f 85 e1 04 00 00    	jne    0x4eb
   a:	49 8b 17             	mov    (%r15),%rdx
   d:	48 8d 3d 0f b0 f6 0e 	lea    0xef6b00f(%rip),%rdi        # 0xef6b023
  14:	41 56                	push   %r14
  16:	65 4c 8b 0d ed 0e 26 	mov    %gs:0x12260eed(%rip),%r9        # 0x12260f0b
  1d:	12
  1e:	4c 89 e9             	mov    %r13,%rcx
  21:	48 c7 c6 a0 cb af 8b 	mov    $0xffffffff8bafcba0,%rsi
* 28:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2d:	e8 51 23 12 03       	call   0x3122383
  32:	5e                   	pop    %rsi
  33:	bf 01 00 00 00       	mov    $0x1,%edi
  38:	e8 a6 2c f1 ff       	call   0xfff12ce3
  3d:	be                   	.byte 0xbe