FYI, we noticed the following commit (built with gcc-4.9):

commit: f7f99cf8bd76d91678e1d8b012a3df449a5c8558 ("crash vmalloc_to_page()")
url: https://github.com/0day-ci/linux/commits/Igor-Stoppa/mm-crash-in-vmalloc_to_page-misuse-or-bug/20180224-002514
base: git://git.cmpxchg.org/linux-mmotm.git master

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu Nehalem -smp 2 -m 512M

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


+------------------------------------------+------------+------------+
|                                          | 745388a346 | f7f99cf8bd |
+------------------------------------------+------------+------------+
| boot_successes                           | 10         | 0          |
| boot_failures                            | 2          | 11         |
| BUG:workqueue_lockup-pool                | 1          |            |
| WARNING:at_mm/vmalloc.c:#vmalloc_to_page | 1          | 11         |
| RIP:vmalloc_to_page                      | 1          | 11         |
+------------------------------------------+------------+------------+





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,
lkp