------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON(!is_rwsem_reader_owned(sem)): count = 0x0, magic = 0xffff88804726ad48, owner = 0x0, curr 0xffff888032eea500, list not empty
WARNING: kernel/locking/rwsem.c:1384 at __up_read+0x52e/0x6b0 kernel/locking/rwsem.c:1384, CPU#0: syz.0.0/5329
Modules linked in:
CPU: 0 UID: 0 PID: 5329 Comm: syz.0.0 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+0x614/0x6b0 kernel/locking/rwsem.c:1384
Code: e6 cc 8b 49 c7 c2 a0 e6 cc 8b 4c 0f 44 d0 48 8b 7c 24 28 48 c7 c6 60 e6 cc 8b 48 89 da 48 8b 4c 24 20 4d 89 f0 4d 89 f9 41 52 <67> 48 0f b9 3a 48 83 c4 08 e8 1e ce 0e 03 4c 8b 7c 24 18 e9 38 fb
RSP: 0018:ffffc90005cffa78 EFLAGS: 00010246
RAX: ffffffff8bcce6c0 RBX: 0000000000000000 RCX: ffff88804726ad48
RDX: 0000000000000000 RSI: ffffffff8bcce660 RDI: ffffffff90340b40
RBP: ffffc90005cffb48 R08: 0000000000000000 R09: ffff888032eea500
R10: ffffffff8bcce6c0 R11: ffffed1008e4d5ab R12: ffff88804726ada0
R13: 1ffff92000b9ff58 R14: 0000000000000000 R15: ffff888032eea500
FS:  00007f90d29d46c0(0000) GS:ffff88808c888000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff5e8fa0000 CR3: 0000000036a27000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 inode_unlock_shared include/linux/fs.h:1054 [inline]
 lookup_slow+0x5e/0x70 fs/namei.c:1933
 walk_component fs/namei.c:2278 [inline]
 lookup_last fs/namei.c:2785 [inline]
 path_lookupat+0x3f5/0x8c0 fs/namei.c:2809
 filename_lookup+0x256/0x5d0 fs/namei.c:2838
 __do_sys_chdir fs/open.c:557 [inline]
 __se_sys_chdir+0xa8/0x2a0 fs/open.c:550
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f90d659cdd9
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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f90d29d3fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000050
RAX: ffffffffffffffda RBX: 00007f90d6816180 RCX: 00007f90d659cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00002000000000c0
RBP: 00007f90d6632d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f90d6816218 R14: 00007f90d6816180 R15: 00007fff69c1ff18
 </TASK>
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	49 c7 c2 a0 e6 cc 8b 	mov    $0xffffffff8bcce6a0,%r10
   7:	4c 0f 44 d0          	cmove  %rax,%r10
   b:	48 8b 7c 24 28       	mov    0x28(%rsp),%rdi
  10:	48 c7 c6 60 e6 cc 8b 	mov    $0xffffffff8bcce660,%rsi
  17:	48 89 da             	mov    %rbx,%rdx
  1a:	48 8b 4c 24 20       	mov    0x20(%rsp),%rcx
  1f:	4d 89 f0             	mov    %r14,%r8
  22:	4d 89 f9             	mov    %r15,%r9
  25:	41 52                	push   %r10
* 27:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2c:	48 83 c4 08          	add    $0x8,%rsp
  30:	e8 1e ce 0e 03       	call   0x30ece53
  35:	4c 8b 7c 24 18       	mov    0x18(%rsp),%r15
  3a:	e9                   	.byte 0xe9
  3b:	38 fb                	cmp    %bh,%bl