------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON(!is_rwsem_reader_owned(sem)): count = 0x0, magic = 0xffff888012d35058, owner = 0x0, curr 0xffff8880002d0000, list empty
WARNING: kernel/locking/rwsem.c:1354 at __up_read+0x532/0x6b0 kernel/locking/rwsem.c:1354, CPU#0: syz.0.0/5338
Modules linked in:
CPU: 0 UID: 0 PID: 5338 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+0x61a/0x6b0 kernel/locking/rwsem.c:1354
Code: e6 8c 8b 49 c7 c2 a0 e6 8c 8b 4c 0f 44 d0 48 8b 7c 24 28 48 c7 c6 40 e6 8c 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 a8 d2 f7 02 4c 8b 7c 24 18 e9 32 fb
RSP: 0018:ffffc9000e8c7898 EFLAGS: 00010246
RAX: ffffffff8b8ce680 RBX: 0000000000000000 RCX: ffff888012d35058
RDX: 0000000000000000 RSI: ffffffff8b8ce640 RDI: ffffffff8fd23af0
RBP: ffffc9000e8c7970 R08: 0000000000000000 R09: ffff8880002d0000
R10: ffffffff8b8ce680 R11: ffffed10025a6a0d R12: ffff888012d350b0
R13: 1ffff92001d18f1c R14: 0000000000000000 R15: ffff8880002d0000
FS:  00007fddc8c5b6c0(0000) GS:ffff88808cf1d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff7f6c3e40 CR3: 000000001faf0000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 inode_unlock_shared include/linux/fs.h:1052 [inline]
 open_last_lookups fs/namei.c:4559 [inline]
 path_openat+0x1bbf/0x3e20 fs/namei.c:4793
 do_filp_open+0x22d/0x490 fs/namei.c:4823
 do_sys_openat2+0x12f/0x220 fs/open.c:1430
 do_sys_open fs/open.c:1436 [inline]
 __do_sys_openat fs/open.c:1452 [inline]
 __se_sys_openat fs/open.c:1447 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1447
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fddc7d9acb9
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:00007fddc8c5b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fddc8016090 RCX: 00007fddc7d9acb9
RDX: 0000000000000000 RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007fddc7e08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000042 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fddc8016128 R14: 00007fddc8016090 R15: 00007fff7f6c49d8
 </TASK>
----------------
Code disassembly (best guess):
   0:	e6 8c                	out    %al,$0x8c
   2:	8b 49 c7             	mov    -0x39(%rcx),%ecx
   5:	c2 a0 e6             	ret    $0xe6a0
   8:	8c 8b 4c 0f 44 d0    	mov    %cs,-0x2fbbf0b4(%rbx)
   e:	48 8b 7c 24 28       	mov    0x28(%rsp),%rdi
  13:	48 c7 c6 40 e6 8c 8b 	mov    $0xffffffff8b8ce640,%rsi
  1a:	48 89 da             	mov    %rbx,%rdx
  1d:	48 8b 4c 24 20       	mov    0x20(%rsp),%rcx
  22:	4d 89 f0             	mov    %r14,%r8
  25:	4d 89 f9             	mov    %r15,%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 a8 d2 f7 02       	call   0x2f7d2e0
  38:	4c 8b 7c 24 18       	mov    0x18(%rsp),%r15
  3d:	e9                   	.byte 0xe9
  3e:	32 fb                	xor    %bl,%bh