================================================
WARNING: lock held when returning to user space!
6.18.0-rc7-next-20251128 #1 Not tainted
------------------------------------------------
syz-executor.7/5549 is leaving the kernel with locks still held!
1 lock held by syz-executor.7/5549:
 #0: ffff88800b3a15c8 (&sb->s_type->i_mutex_key#27/1){+.+.}-{4:4}, at: start_creating_noperm+0x84/0xd0
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 0 UID: 0 PID: 5551 Comm: syz-executor.4 Not tainted 6.18.0-rc7-next-20251128 #1 PREEMPT(voluntary) 
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xfa/0x120
 should_fail_ex+0x4d7/0x5e0
 _copy_from_user+0x30/0xd0
 copy_msghdr_from_user+0x88/0x150
 ___sys_sendmsg+0xdc/0x1b0
 __sys_sendmsg+0x150/0x200
 do_syscall_64+0xbf/0x420
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1b4bc16b19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1b4918c188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1b4bd29f60 RCX: 00007f1b4bc16b19
RDX: 0000000000000000 RSI: 0000000020000380 RDI: 0000000000000003
RBP: 00007f1b4918c1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffeeb1090df R14: 00007f1b4918c300 R15: 0000000000022000
 </TASK>
netlink: 8 bytes leftover after parsing attributes in process `syz-executor.7'.
loop6: detected capacity change from 0 to 264192
EXT4-fs (loop6): first meta block group too large: 537163587 (group descriptor block count 1)
loop6: detected capacity change from 0 to 264192
EXT4-fs (loop6): first meta block group too large: 537163587 (group descriptor block count 1)