FYI, we noticed the following commit (built with gcc-5):

commit: 072435cb5d82cab2752ebb5fb3ca03e831efcfcf ("lib/test_bitmap.c: Add for_each_set_clump test cases")
url: https://github.com/0day-ci/linux/commits/William-Breathitt-Gray/Introduce-the-for_each_set_clump-macro/20180516-161629
base: https://git.kernel.org/cgit/linux/kernel/git/linusw/linux-gpio.git for-next

in testcase: boot

on test machine: qemu-system-i386 -enable-kvm -m 360M

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


+----------------------------------------------------------------------------------------+------------+------------+
|                                                                                        | 6edf45bf79 | 072435cb5d |
+----------------------------------------------------------------------------------------+------------+------------+
| boot_successes                                                                         | 0          | 0          |
| boot_failures                                                                          | 12         | 19         |
| WARNING:at_lib/debugobjects.c:#__debug_object_init                                     | 12         | 19         |
| EIP:__debug_object_init                                                                | 12         | 19         |
| WARNING:suspicious_RCU_usage                                                           | 12         | 19         |
| lib/test_rhashtable.c:#suspicious_rcu_dereference_protected()usage                     | 12         | 19         |
| WARNING:at_arch/x86/include/asm/pgtable.h:#check_pgprot                                | 12         |            |
| EIP:check_pgprot                                                                       | 12         |            |
| WARNING:at_arch/x86/include/asm/pgtable.h:#change_protection_range                     | 6          |            |
| EIP:change_protection_range                                                            | 6          |            |
| WARNING:possible_circular_locking_dependency_detected                                  | 12         |            |
| EIP:arch_local_irq_restore                                                             | 12         |            |
| Kernel_panic-not_syncing:stack-protector:Kernel_stack_is_corrupted_in:test_bitmap_init | 0          | 19         |
+----------------------------------------------------------------------------------------+------------+------------+



[  141.136400] test_bitmap: test 13: input is '0-2047:128/256' OK, Time: 3451
[  141.176769] test_bitmap: [lib/test_bitmap.c:422] expected 0x2, got 0xE
[  141.176802] test_bitmap: [lib/test_bitmap.c:422] clump index for zero clump: expected nonzero clump, got clump index 2 with clump value 0
[  141.189022] test_bitmap: [lib/test_bitmap.c:422] expected 0xE, got 0xF
[  141.209729] test_bitmap: [lib/test_bitmap.c:422] expected 0x3, got 0xF
[  141.221779] test_bitmap: [lib/test_bitmap.c:422] expected 0x5, got 0xF
[  141.234193] test_bitmap: failed 5 out of 1532 tests
[  141.254187] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: test_bitmap_init+0x18e/0x195
[  141.254187] 
[  141.264028] CPU: 0 PID: 1 Comm: swapper Tainted: G        W         4.17.0-rc1-00049-g072435c #1
[  141.264028] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[  141.264028] Call Trace:
[  141.264028]  dump_stack+0x16/0x18
[  141.264028]  panic+0x90/0x1b5
[  141.264028]  ? test_copy+0x22b/0x22b
[  141.264028]  __stack_chk_fail+0x10/0x10
[  141.264028]  ? test_bitmap_init+0x18e/0x195
[  141.264028]  test_bitmap_init+0x18e/0x195
[  141.264028]  do_one_initcall+0x68/0x140
[  141.264028]  ? kernel_init_freeable+0xc3/0x15d
[  141.264028]  ? up_write+0x16/0x2a
[  141.264028]  kernel_init_freeable+0xe3/0x15d
[  141.264028]  ? rest_init+0x94/0x94
[  141.264028]  kernel_init+0x8/0xcb
[  141.264028]  ret_from_fork+0x19/0x24
[  141.264028] Kernel Offset: 0xf800000 from 0xc1000000 (relocation range: 0xc0000000-0xd6fdffff)

Elapsed time: 150

#!/bin/bash

# To reproduce,
# 1) save job-script and this script (both are attached in 0day report email)
# 2) run this script with your compiled kernel and optional env $INSTALL_MOD_PATH

kernel=$1

initrds=(
	/osimage/quantal/quantal-core-i386.cgz
	/lkp/lkp/lkp-i386.cgz
)

HTTP_PREFIX=https://github.com/0day-ci/lkp-qemu/raw/master
wget --timestamping "${initrds[@]/#/$HTTP_PREFIX}"



To reproduce:

        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,
Xiaolong