WARNING in filename

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	WARNING in filename_mkdirat gfs2 prio:high	-1	C			84	27d	110d	29/29	fixed on 2026/05/21 07:50
------------[ cut here ]------------
DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff888046de1118, owner = 0x0, curr 0xffff888000932540, list not empty
WARNING: kernel/locking/rwsem.c:1411 at __up_write kernel/locking/rwsem.c:1410 [inline], CPU#0: syz.0.0/5329
WARNING: kernel/locking/rwsem.c:1411 at up_write+0x2d4/0x410 kernel/locking/rwsem.c:1682, CPU#0: syz.0.0/5329
Modules linked in:
CPU: 0 UID: 0 PID: 5329 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_write kernel/locking/rwsem.c:1410 [inline]
RIP: 0010:up_write+0x384/0x410 kernel/locking/rwsem.c:1682
Code: cc 8b 49 c7 c2 40 e6 cc 8b 4c 0f 44 d0 48 8b 7c 24 08 48 c7 c6 e0 e8 cc 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 4e c2 0e 03 e9 6b fd ff ff 48 c7 c1
RSP: 0018:ffffc9000e66fd80 EFLAGS: 00010246
RAX: ffffffff8bcce660 RBX: ffff888046de1118 RCX: ffff888046de1118
RDX: 0000000000000000 RSI: ffffffff8bcce8e0 RDI: ffffffff9033a6b0
RBP: ffff888046de1170 R08: 0000000000000000 R09: ffff888000932540
R10: ffffffff8bcce660 R11: ffffed1008dbc225 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888046de1118 R15: 1ffff11008dbc224
FS:  00007f9ebdd156c0(0000) GS:ffff88808c891000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdfc4261000 CR3: 0000000012e29000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 inode_unlock include/linux/fs.h:1039 [inline]
 end_dirop fs/namei.c:2951 [inline]
 end_creating include/linux/namei.h:123 [inline]
 end_creating_path fs/namei.c:4990 [inline]
 filename_mkdirat+0x305/0x510 fs/namei.c:5299
 __do_sys_mkdirat fs/namei.c:5315 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5312
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9ebcd9ce59
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:00007f9ebdd14fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f9ebd016090 RCX: 00007f9ebcd9ce59
RDX: 00000000000001c0 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f9ebce32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9ebd016128 R14: 00007f9ebd016090 R15: 00007fffe154be58
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	49 c7 c2 40 e6 cc 8b 	mov    $0xffffffff8bcce640,%r10
   7:	4c 0f 44 d0          	cmove  %rax,%r10
   b:	48 8b 7c 24 08       	mov    0x8(%rsp),%rdi
  10:	48 c7 c6 e0 e8 cc 8b 	mov    $0xffffffff8bcce8e0,%rsi
  17:	48 8b 14 24          	mov    (%rsp),%rdx
  1b:	4c 89 f1             	mov    %r14,%rcx
  1e:	4d 89 e0             	mov    %r12,%r8
  21:	4c 8b 4c 24 10       	mov    0x10(%rsp),%r9
  26:	41 52                	push   %r10
* 28:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2d:	48 83 c4 08          	add    $0x8,%rsp
  31:	e8 4e c2 0e 03       	call   0x30ec284
  36:	e9 6b fd ff ff       	jmp    0xfffffda6
  3b:	48                   	rex.W
  3c:	c7                   	.byte 0xc7
  3d:	c1                   	.byte 0xc1