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DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff88807587f178, owner = 0x0, curr 0xffff8880309c8000, list empty
WARNING: kernel/locking/rwsem.c:1380 at __up_write kernel/locking/rwsem.c:1380 [inline], CPU#0: syz.2.5647/29382
WARNING: kernel/locking/rwsem.c:1380 at up_write+0x1c1/0x4e0 kernel/locking/rwsem.c:1643, CPU#0: syz.2.5647/29382
Modules linked in:
CPU: 0 UID: 0 PID: 29382 Comm: syz.2.5647 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__up_write kernel/locking/rwsem.c:1380 [inline]
RIP: 0010:up_write+0x1d3/0x4e0 kernel/locking/rwsem.c:1643
Code: 48 c1 ea 03 80 3c 02 00 0f 85 ad 02 00 00 48 8b 13 48 8d 3d ef 01 f3 0e 41 55 4d 89 f1 4d 89 f8 4c 89 e1 48 c7 c6 80 cd 8d 8b <67> 48 0f b9 3a e8 f3 00 0f 03 5a bf 01 00 00 00 e8 38 8c f1 ff 48
RSP: 0018:ffffc900033c7ca0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88807587f178 RCX: ffff88807587f178
RDX: 0000000000000000 RSI: ffffffff8b8dcd80 RDI: ffffffff908c2e90
RBP: ffff88807587f180 R08: 0000000000000000 R09: ffff8880309c8000
R10: ffff88807587f17f R11: ffff8880309c8b30 R12: ffff88807587f178
R13: ffffffff8b8dca80 R14: ffff8880309c8000 R15: 0000000000000000
FS:  00007f15357406c0(0000) GS:ffff8881248f6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9ed5e00000 CR3: 0000000054898000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:1037 [inline]
 chown_common+0x3f4/0x680 fs/open.c:790
 do_fchownat+0x1a7/0x200 fs/open.c:819
 __do_sys_lchown fs/open.c:844 [inline]
 __se_sys_lchown fs/open.c:842 [inline]
 __x64_sys_lchown+0x7e/0xc0 fs/open.c:842
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f153498f749
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:00007f1535740038 EFLAGS: 00000246 ORIG_RAX: 000000000000005e
RAX: ffffffffffffffda RBX: 00007f1534be6090 RCX: 00007f153498f749
RDX: 0000000039323420 RSI: 00000000706d6174 RDI: 0000200000000000
RBP: 00007f1534a13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1534be6128 R14: 00007f1534be6090 R15: 00007ffd0881e328
 </TASK>
----------------
Code disassembly (best guess):
   0:	48 c1 ea 03          	shr    $0x3,%rdx
   4:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   8:	0f 85 ad 02 00 00    	jne    0x2bb
   e:	48 8b 13             	mov    (%rbx),%rdx
  11:	48 8d 3d ef 01 f3 0e 	lea    0xef301ef(%rip),%rdi        # 0xef30207
  18:	41 55                	push   %r13
  1a:	4d 89 f1             	mov    %r14,%r9
  1d:	4d 89 f8             	mov    %r15,%r8
  20:	4c 89 e1             	mov    %r12,%rcx
  23:	48 c7 c6 80 cd 8d 8b 	mov    $0xffffffff8b8dcd80,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e8 f3 00 0f 03       	call   0x30f0127
  34:	5a                   	pop    %rdx
  35:	bf 01 00 00 00       	mov    $0x1,%edi
  3a:	e8 38 8c f1 ff       	call   0xfff18c77
  3f:	48                   	rex.W