------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON(!is_rwsem_reader_owned(sem)): count = 0x0, magic = 0xffff888043f03ba8, owner = 0x0, curr 0xffff8880357b2580, list not empty
WARNING: kernel/locking/rwsem.c:1384 at __up_read+0x6a7/0x930 kernel/locking/rwsem.c:1384, CPU#0: syz.0.0/5323
Modules linked in:
CPU: 0 UID: 0 PID: 5323 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+0x77f/0x930 kernel/locking/rwsem.c:1384
Code: 8c 49 c7 c2 c0 1d 0d 8c 4c 0f 44 d0 48 8b 7c 24 28 48 c7 c6 80 1d 0d 8c 48 8b 54 24 18 4c 89 e9 4d 89 e0 4c 8b 4c 24 08 41 52 <67> 48 0f b9 3a 48 83 c4 08 e8 a3 60 3a 03 4c 8b 3c 24 48 8b 5c 24
RSP: 0018:ffffc9000f73f8d8 EFLAGS: 00010246
RAX: ffffffff8c0d1de0 RBX: 1ffff110087e0776 RCX: ffff888043f03ba8
RDX: 0000000000000000 RSI: ffffffff8c0d1d80 RDI: ffffffff907d95b0
RBP: ffffc9000f73f9c0 R08: 0000000000000000 R09: ffff8880357b2580
R10: ffffffff8c0d1de0 R11: ffffed10087e0777 R12: 0000000000000000
R13: ffff888043f03ba8 R14: ffff888043f03c00 R15: ffff888043f03bb0
FS:  00007f2faffe56c0(0000) GS:ffff88808c2c6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe71bd88000 CR3: 000000000bed8000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 inode_unlock_shared include/linux/fs.h:1049 [inline]
 lookup_slow+0x5e/0x70 fs/namei.c:1937
 walk_component fs/namei.c:2282 [inline]
 link_path_walk+0xd2a/0x1910 fs/namei.c:2656
 path_openat+0x1c9/0x1d60 fs/namei.c:4996
 do_file_open+0x23e/0x4a0 fs/namei.c:5029
 do_sys_openat2+0x115/0x200 fs/open.c:1417
 do_sys_open fs/open.c:1423 [inline]
 __do_sys_openat fs/open.c:1439 [inline]
 __se_sys_openat fs/open.c:1434 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1434
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2faf19e159
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:00007f2faffe4fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f2faf426090 RCX: 00007f2faf19e159
RDX: 0000000000000001 RSI: 0000200000000240 RDI: ffffffffffffff9c
RBP: 00007f2faf23503b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2faf426128 R14: 00007f2faf426090 R15: 00007fffc4a8c508
 </TASK>
----------------
Code disassembly (best guess):
   0:	8c 49 c7             	mov    %cs,-0x39(%rcx)
   3:	c2 c0 1d             	ret    $0x1dc0
   6:	0d 8c 4c 0f 44       	or     $0x440f4c8c,%eax
   b:	d0 48 8b             	rorb   $1,-0x75(%rax)
   e:	7c 24                	jl     0x34
  10:	28 48 c7             	sub    %cl,-0x39(%rax)
  13:	c6 80 1d 0d 8c 48 8b 	movb   $0x8b,0x488c0d1d(%rax)
  1a:	54                   	push   %rsp
  1b:	24 18                	and    $0x18,%al
  1d:	4c 89 e9             	mov    %r13,%rcx
  20:	4d 89 e0             	mov    %r12,%r8
  23:	4c 8b 4c 24 08       	mov    0x8(%rsp),%r9
  28:	41 52                	push   %r10
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	48 83 c4 08          	add    $0x8,%rsp
  33:	e8 a3 60 3a 03       	call   0x33a60db
  38:	4c 8b 3c 24          	mov    (%rsp),%r15
  3c:	48                   	rex.W
  3d:	8b                   	.byte 0x8b
  3e:	5c                   	pop    %rsp
  3f:	24                   	.byte 0x24