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kernel test robot noticed "BUG_bio-#(Tainted:G_S):Objects_remaining_in_bio-#on__kmem_cache_shutdown()" on:

commit: d0dc03872a9d13afc16b9f12e69cb0dc60437198 ("[PATCH] slub: Introduce CONFIG_SLUB_RCU_DEBUG")
patch link:
patch subject: [PATCH] slub: Introduce CONFIG_SLUB_RCU_DEBUG

in testcase: mdadm-selftests
version: mdadm-selftests-x86_64-5f41845-1_20220826
with following parameters:

	disk: 1HDD
	test_prefix: 01replace

compiler: gcc-12
test machine: 8 threads 1 sockets Intel(R) Core(TM) i7-4790T CPU @ 2.70GHz (Haswell) with 16G memory

(please refer to attached dmesg/kmsg for entire log/backtrace)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
| Closes:

kern  :info  : [  120.278340] md: recovery of RAID array md0
kern  :info  : [  124.955979] md: md0: recovery done.
kern  :info  : [  125.769059] md: recovery of RAID array md0
kern  :info  : [  127.326184] md: md0: recovery done.
kern  :err   : [  133.408242] =============================================================================
kern  :err   : [  133.417160] BUG bio-144 (Tainted: G S                ): Objects remaining in bio-144 on __kmem_cache_shutdown()
kern  :err   : [  133.427951] -----------------------------------------------------------------------------

kern  :err   : [  133.439000] Slab 0x00000000419abc96 objects=32 used=2 fp=0x000000008e0d14fb flags=0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff)
kern  :warn  : [  133.452568] CPU: 3 PID: 1314 Comm: mdadm Tainted: G S                 6.5.0-rc7-00105-gd0dc03872a9d #1
kern  :warn  : [  133.462585] Hardware name: Gigabyte Technology Co., Ltd. Z97X-UD5H/Z97X-UD5H, BIOS F9 04/21/2015
kern  :warn  : [  133.472076] Call Trace:
kern  :warn  : [  133.475236]  <TASK>
kern :warn : [  133.478051] dump_stack_lvl (kbuild/src/consumer/lib/dump_stack.c:107 (discriminator 1)) 
kern :warn : [  133.482427] slab_err (kbuild/src/consumer/mm/slub.c:1016) 
kern :warn : [  133.486370] ? _raw_spin_lock_irqsave (kbuild/src/consumer/arch/x86/include/asm/atomic.h:115 kbuild/src/consumer/include/linux/atomic/atomic-arch-fallback.h:2155 kbuild/src/consumer/include/linux/atomic/atomic-instrumented.h:1296 kbuild/src/consumer/include/asm-generic/qspinlock.h:111 kbuild/src/consumer/include/linux/spinlock.h:187 kbuild/src/consumer/include/linux/spinlock_api_smp.h:111 kbuild/src/consumer/kernel/locking/spinlock.c:162) 
kern :warn : [  133.491615] __kmem_cache_shutdown (kbuild/src/consumer/include/linux/spinlock.h:351 kbuild/src/consumer/mm/slub.c:4625 kbuild/src/consumer/mm/slub.c:4656 kbuild/src/consumer/mm/slub.c:4688) 

The kernel config and materials to reproduce are available at:

0-DAY CI Kernel Test Service

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