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

commit: 6471384af2a6530696fc0203bafe4de41a23c9ef ("mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options")
https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux.git master

in testcase: trinity
with following parameters:

	runtime: 300s

test-description: Trinity is a linux system call fuzz tester.
test-url: http://codemonkey.org.uk/projects/trinity/


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):


+------------------------------------------+------------+------------+
|                                          | ba5c5e4a5d | 6471384af2 |
+------------------------------------------+------------+------------+
| boot_successes                           | 8          | 0          |
| boot_failures                            | 2          | 15         |
| invoked_oom-killer:gfp_mask=0x           | 1          |            |
| Mem-Info                                 | 1          |            |
| kernel_BUG_at_security/keys/keyring.c    | 1          |            |
| invalid_opcode:#[##]                     | 1          | 15         |
| RIP:__key_link_begin                     | 1          |            |
| Kernel_panic-not_syncing:Fatal_exception | 1          | 15         |
| kernel_BUG_at_mm/slub.c                  | 0          | 15         |
| RIP:kfree                                | 0          | 15         |
+------------------------------------------+------------+------------+


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


[    4.478342] kernel BUG at mm/slub.c:306!
[    4.482437] invalid opcode: 0000 [#1] PREEMPT PTI
[    4.485750] CPU: 0 PID: 0 Comm: swapper Not tainted 5.2.0-05754-g6471384a #4
[    4.490635] RIP: 0010:kfree+0x58a/0x5c0
[    4.493679] Code: 48 83 05 78 37 51 02 01 0f 0b 48 83 05 7e 37 51 02 01 48 83 05 7e 37 51 02 01 48 83 05 7e 37 51 02 01 48 83 05 d6 37 51 02 01 <0f> 0b 48 83 05 d4 37 51 02 01 48 83 05 d4 37 51 02 01 48 83 05 d4
[    4.506827] RSP: 0000:ffffffff82603d90 EFLAGS: 00010002
[    4.510475] RAX: ffff8c3976c04320 RBX: ffff8c3976c04300 RCX: 0000000000000000
[    4.515420] RDX: ffff8c3976c04300 RSI: 0000000000000000 RDI: ffff8c3976c04320
[    4.520331] RBP: ffffffff82603db8 R08: 0000000000000000 R09: 0000000000000000
[    4.525288] R10: ffff8c3976c04320 R11: ffffffff8289e1e0 R12: ffffd52cc8db0100
[    4.530180] R13: ffff8c3976c01a00 R14: ffffffff810f10d4 R15: ffff8c3976c04300
[    4.535079] FS:  0000000000000000(0000) GS:ffffffff8266b000(0000) knlGS:0000000000000000
[    4.540628] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.544593] CR2: ffff8c397ffff000 CR3: 0000000125020000 CR4: 00000000000406b0
[    4.549558] Call Trace:
[    4.551266]  apply_wqattrs_prepare+0x154/0x280
[    4.554357]  apply_workqueue_attrs_locked+0x4e/0xe0
[    4.557728]  apply_workqueue_attrs+0x36/0x60
[    4.560654]  alloc_workqueue+0x25a/0x6d0
[    4.563381]  ? kmem_cache_alloc_trace+0x1e3/0x500
[    4.566628]  ? __mutex_unlock_slowpath+0x44/0x3f0
[    4.569875]  workqueue_init_early+0x246/0x348
[    4.573025]  start_kernel+0x3c7/0x7ec
[    4.575558]  x86_64_start_reservations+0x40/0x49
[    4.578738]  x86_64_start_kernel+0xda/0xe4
[    4.581600]  secondary_startup_64+0xb6/0xc0
[    4.584473] Modules linked in:
[    4.586620] ---[ end trace f67eb9af4d8d492b ]---


To reproduce:

        # build kernel
	cd linux
	cp config-5.2.0-05754-g6471384a .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,
Rong Chen