FYI, we noticed the following commit (built with gcc-7):

commit: 43eedfb5222fdb27697f96e19e32518489f0da3b ("slub: call BUG if next_object is not valid")
url: https://github.com/0day-ci/linux/commits/lijiazi/slub-call-BUG-if-next_object-is-not-valid/20200104-132229

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+------------------------------------------+------------+------------+
|                                          | 3a562aee72 | 43eedfb522 |
+------------------------------------------+------------+------------+
| boot_successes                           | 20         | 0          |
| boot_failures                            | 0          | 4          |
| kernel_BUG_at_mm/slub.c                  | 0          | 4          |
| invalid_opcode:#[##]                     | 0          | 4          |
| RIP:kmem_cache_alloc                     | 0          | 4          |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 4          |
+------------------------------------------+------------+------------+


If you fix the issue, kindly add following tag
Reported-by: kernel test robot <lkp@intel.com>


[    0.260175] kernel BUG at mm/slub.c:2729!
[    0.260534] invalid opcode: 0000 [#1] SMP PTI
[    0.260806] CPU: 0 PID: 0 Comm: swapper Not tainted 5.5.0-rc4-00125-g43eedfb5222fd #2
[    0.261334] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[    0.261883] RIP: 0010:kmem_cache_alloc+0x79/0x169
[    0.262177] Code: 89 e7 e8 3e ff ff ff 48 89 c5 eb 40 41 8b 44 24 20 48 89 14 24 48 8b 5c 05 00 48 89 df e8 41 1f df ff 84 c0 48 8b 14 24 75 02 <0f> 0b 49 8b 3c 24 48 8d 4a 01 48 89 e8 48 8d 37 e8 29 5c 95 00 84
[    0.263852] RSP: 0000:ffffffff82803e38 EFLAGS: 00010046
[    0.264270] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[    0.264715] RDX: 0000000000000012 RSI: 0000000000000100 RDI: 0000000080000000
[    0.265159] RBP: ffff88822a4021c0 R08: ffff88823fc2e6c0 R09: 0000000000000000
[    0.265641] R10: 0000000000000400 R11: 0000000000000000 R12: ffff88822a402000
[    0.266109] R13: 0000000000000900 R14: ffff88822a402000 R15: ffffffff82df9345
[    0.266554] FS:  0000000000000000(0000) GS:ffff88823fc00000(0000) knlGS:0000000000000000
[    0.267110] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.267492] CR2: ffff88823ffff000 CR3: 000000000280a000 CR4: 00000000000406b0
[    0.267965] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    0.268437] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    0.268918] Call Trace:
[    0.269083]  create_kmalloc_cache+0x31/0xa4
[    0.269348]  new_kmalloc_cache+0x41/0x4c
[    0.269687]  create_kmalloc_caches+0x34/0xdc
[    0.270059]  kmem_cache_init+0xad/0x103
[    0.270393]  start_kernel+0x214/0x4fd
[    0.270750]  ? x86_family+0x5/0x1d
[    0.271063]  secondary_startup_64+0xb6/0xc0
[    0.271373] Modules linked in:
[    0.271589] random: get_random_bytes called from init_oops_id+0x22/0x31 with crng_init=0
[    0.272121] ---[ end trace 4f4aaf971ad2af9d ]---


To reproduce:

        # build kernel
	cd linux
	cp config-5.5.0-rc4-00125-g43eedfb5222fd .config
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email



Thanks,
lkp