FYI, we noticed the following commit:

commit: 73821bb516920b2b38732ce992d11c08c5d8bd7d ("your mail")
url: https://github.com/0day-ci/linux/commits/Michal-Hocko/mm-consider-zone-which-is-not-fully-populated-to-have-holes/20170420-173046


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-i386 -enable-kvm -smp 2 -m 320M

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


+--------------------------------------------------------+----------+------------+
|                                                        | v4.9-rc8 | 73821bb516 |
+--------------------------------------------------------+----------+------------+
| boot_successes                                         | 5        | 0          |
| boot_failures                                          | 4        | 19         |
| BUG:workqueue_lockup-pool                              | 4        | 12         |
| WARNING:at_mm/memblock.c:#memblock_virt_alloc_internal | 0        | 19         |
+--------------------------------------------------------+----------+------------+



[    0.000000] WARNING: CPU: 0 PID: 0 at mm/memblock.c:1261 memblock_virt_alloc_internal+0xa2/0x3bb
[    0.000000] Usage of MAX_NUMNODES is deprecated. Use NUMA_NO_NODE instead
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.9.0-rc8-00001-g73821bb #1
[    0.000000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
[    0.000000]  c100d60b c1994dde c1a4fe84 c1a4fe58 c122041d c1a4fe70 c1044973 c1cf3fb9
[    0.000000]  b95b9258 00000001 00000001 c1a4fe8c c10449b7 00000009 00000000 c1a4fe84
[    0.000000]  c1993532 c1a4fea0 c1a4fec4 c1cf3fb9 c19934b3 000004ed c1993532 00000000
[    0.000000] Call Trace:
[    0.000000]  [<c100d60b>] ? show_stack+0x59/0x5f
[    0.000000]  [<c122041d>] dump_stack+0x16/0x18
[    0.000000]  [<c1044973>] __warn+0x104/0x11b
[    0.000000]  [<c1cf3fb9>] ? memblock_virt_alloc_internal+0xa2/0x3bb
[    0.000000]  [<c10449b7>] warn_slowpath_fmt+0x2d/0x32
[    0.000000]  [<c1cf3fb9>] memblock_virt_alloc_internal+0xa2/0x3bb
[    0.000000]  [<c1034010>] ? pte_offset_kernel+0x10/0x1e
[    0.000000]  [<c1cf4681>] memblock_virt_alloc_try_nid+0x94/0xf1
[    0.000000]  [<c1cf5dcf>] sparse_mem_map_populate+0x35/0x50
[    0.000000]  [<c1cf61d2>] sparse_init+0x234/0x35f
[    0.000000]  [<c1cdcbe8>] paging_init+0x89/0xa5
[    0.000000]  [<c1cdccf3>] native_pagetable_init+0xef/0x200
[    0.000000]  [<c1cc2ed3>] setup_arch+0xda2/0xe34
[    0.000000]  [<c1cbd00c>] start_kernel+0x62/0x57b
[    0.000000]  [<c1cbc2ed>] i386_start_kernel+0xd4/0xec
[    0.000000] ---[ end trace 0000000000000000 ]---


To reproduce:

        git clone https://github.com/01org/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email



Thanks,
Xiaolong