------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON(!is_rwsem_reader_owned(sem)): count = 0x0, magic = 0xffff88803776c9b8, owner = 0x0, curr 0xffff888000a3c980, list empty
WARNING: kernel/locking/rwsem.c:1354 at __up_read+0x532/0x6b0 kernel/locking/rwsem.c:1354, CPU#0: syz.0.0/5328
Modules linked in:
CPU: 0 UID: 0 PID: 5328 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: eb cc 8b 49 c7 c2 c0 eb cc 8b 4c 0f 44 d0 48 8b 7c 24 28 48 c7 c6 60 eb 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 a8 a8 0b 03 4c 8b 7c 24 18 e9 32 fb
RSP: 0018:ffffc9000df9f918 EFLAGS: 00010246
RAX: ffffffff8bcceba0 RBX: 0000000000000000 RCX: ffff88803776c9b8
RDX: 0000000000000000 RSI: ffffffff8bcceb60 RDI: ffffffff9014fde0
RBP: ffffc9000df9f9e8 R08: 0000000000000000 R09: ffff888000a3c980
R10: ffffffff8bcceba0 R11: ffffed1006eed939 R12: ffff88803776ca10
R13: 1ffff92001bf3f2c R14: 0000000000000000 R15: ffff888000a3c980
FS:  00007f05c9bd46c0(0000) GS:ffff88808ca58000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc5cdebf40 CR3: 00000000362d9000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 inode_unlock_shared include/linux/fs.h:1053 [inline]
 lookup_slow+0x5e/0x70 fs/namei.c:1934
 walk_component fs/namei.c:2279 [inline]
 link_path_walk+0xd1e/0x18d0 fs/namei.c:2647
 path_parentat fs/namei.c:2851 [inline]
 __filename_parentat+0x27f/0x6f0 fs/namei.c:2875
 filename_parentat fs/namei.c:2893 [inline]
 filename_create+0xd9/0x370 fs/namei.c:4903
 filename_mknodat+0x18c/0x660 fs/namei.c:5130
 __do_sys_mknodat fs/namei.c:5173 [inline]
 __se_sys_mknodat+0x3b/0x150 fs/namei.c:5169
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f05cd79c799
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:00007f05c9bd3fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000103
RAX: ffffffffffffffda RBX: 00007f05cda16180 RCX: 00007f05cd79c799
RDX: 00000000000081c0 RSI: 0000200000000200 RDI: ffffffffffffff9c
RBP: 00007f05cd832c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f05cda16218 R14: 00007f05cda16180 R15: 00007ffc5cdec708
 </TASK>
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	49 c7 c2 c0 eb cc 8b 	mov    $0xffffffff8bccebc0,%r10
   7:	4c 0f 44 d0          	cmove  %rax,%r10
   b:	48 8b 7c 24 28       	mov    0x28(%rsp),%rdi
  10:	48 c7 c6 60 eb cc 8b 	mov    $0xffffffff8bcceb60,%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 a8 a8 0b 03       	call   0x30ba8dd
  35:	4c 8b 7c 24 18       	mov    0x18(%rsp),%r15
  3a:	e9                   	.byte 0xe9
  3b:	32 fb                	xor    %bl,%bh