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DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff888051c85058, owner = 0x0, curr 0xffff888000afa4c0, list empty
WARNING: kernel/locking/rwsem.c:1381 at 0x0, CPU#0: syz.0.0/5340
Modules linked in:
CPU: 0 UID: 0 PID: 5340 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~bpo12+1 04/01/2014
RIP: 0010:__up_write kernel/locking/rwsem.c:1380 [inline]
RIP: 0010:up_write+0x38a/0x410 kernel/locking/rwsem.c:1643
Code: 6b 8b 49 c7 c2 00 24 6b 8b 4c 0f 44 d0 48 8b 7c 24 08 48 c7 c6 20 25 6b 8b 48 8b 14 24 4c 89 f1 4d 89 e0 4c 8b 4c 24 10 41 52 <67> 48 0f b9 3a 48 83 c4 08 e8 98 a0 eb 02 e9 66 fd ff ff 48 c7 c1
RSP: 0018:ffffc9000d62fd80 EFLAGS: 00010246
RAX: ffffffff8b6b23e0 RBX: ffff888051c85058 RCX: ffff888051c85058
RDX: 0000000000000000 RSI: ffffffff8b6b2520 RDI: ffffffff8f848bb0
RBP: ffff888051c850b0 R08: 0000000000000000 R09: ffff888000afa4c0
R10: ffffffff8b6b23e0 R11: ffffed100a390a0d R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888051c85058 R15: 1ffff1100a390a0c
FS:  00007efc611e06c0(0000) GS:ffff88808d683000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efc611dffc8 CR3: 000000004326c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:1037 [inline]
 end_dirop fs/namei.c:2888 [inline]
 end_creating include/linux/namei.h:126 [inline]
 end_creating_path fs/namei.c:4922 [inline]
 do_mknodat+0x45c/0x610 fs/namei.c:5053
 __do_sys_mknod fs/namei.c:5076 [inline]
 __se_sys_mknod fs/namei.c:5074 [inline]
 __x64_sys_mknod+0x8c/0xa0 fs/namei.c:5074
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efc6038f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efc611e0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007efc605e6180 RCX: 00007efc6038f7c9
RDX: 0000000000000400 RSI: 0000000000001000 RDI: 0000200000000280
RBP: 00007efc60413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efc605e6218 R14: 00007efc605e6180 R15: 00007ffd7f18d9e8
 </TASK>
----------------
Code disassembly (best guess):
   0:	6b 8b 49 c7 c2 00 24 	imul   $0x24,0xc2c749(%rbx),%ecx
   7:	6b 8b 4c 0f 44 d0 48 	imul   $0x48,-0x2fbbf0b4(%rbx),%ecx
   e:	8b 7c 24 08          	mov    0x8(%rsp),%edi
  12:	48 c7 c6 20 25 6b 8b 	mov    $0xffffffff8b6b2520,%rsi
  19:	48 8b 14 24          	mov    (%rsp),%rdx
  1d:	4c 89 f1             	mov    %r14,%rcx
  20:	4d 89 e0             	mov    %r12,%r8
  23:	4c 8b 4c 24 10       	mov    0x10(%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 98 a0 eb 02       	call   0x2eba0d0
  38:	e9 66 fd ff ff       	jmp    0xfffffda3
  3d:	48                   	rex.W
  3e:	c7                   	.byte 0xc7
  3f:	c1                   	.byte 0xc1