linux-kernel - [lkp] [mm, page_alloc] 43993977ba: +88% OOM possibility

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Date:	Wed, 28 Oct 2015 13:36:02 +0800
From:	kernel test robot <ying.huang@...ux.intel.com>
TO:	Mel Gorman <mgorman@...hsingularity.net>
CC:	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: [lkp] [mm, page_alloc] 43993977ba: +88% OOM possibility

FYI, we noticed the below changes on

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 43993977baecd838d66ccabc7f682342fc6ff635 ("mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd")

We found the OOM possibility increased 88% in a virtual machine with 1G memory.

=========================================================================================
tbox_group/testcase/rootfs/kconfig/compiler/disk/fs/test:
  vm-kbuild-1G/xfstests/debian-x86_64-2015-02-07.cgz/x86_64-allyesdebian/gcc-4.9/4HDD/btrfs/generic-mid

commit: 
  74fad8a3a917b9e0a407af8a4150c61f7b836591
  43993977baecd838d66ccabc7f682342fc6ff635

74fad8a3a917b9e0 43993977baecd838d66ccabc7f 
---------------- -------------------------- 
       fail:runs  %reproduction    fail:runs
           |             |             |    
          1:24          -4%            :24    xfstests.generic.192.fail
          1:24          -4%            :24    xfstests.nr_fail
           :24          88%          21:24    dmesg.Mem-Info
           :24          62%          15:24    dmesg.page_allocation_failure:order:#,mode
           :24          88%          21:24    dmesg.warn_alloc_failed+0x
           :24          75%          18:24    last_state.is_incomplete_run
          1:24          -4%            :24    last_state.xfstests.exit_code.1
           :24          54%          13:24    last_state.xfstests.exit_code.143
           :24          71%          17:24    kmsg.SLAB:Unable_to_allocate_memory_on_node#(gfp=#)
          1:24          -4%            :24    kmsg.TDH<#>
          1:24          -4%            :24    kmsg.TDH<c7>
          1:24          -4%            :24    kmsg.TDT<#>
          1:24          -4%            :24    kmsg.TDT<c7>
          1:24          -4%            :24    kmsg.Tx_Queue<#>
          1:24          -4%            :24    kmsg.buffer_info[next_to_clean]
          1:24          -4%            :24    kmsg.e1000#:#:#eth0:Detected_Tx_Unit_Hang
          1:24          -4%            :24    kmsg.jiffies<#>
          1:24          -4%            :24    kmsg.jiffies<#c5c>
          1:24          -4%            :24    kmsg.next_to_clean<#>
          1:24          -4%            :24    kmsg.next_to_clean<c7>
          1:24          -4%            :24    kmsg.next_to_use<#>
          1:24          -4%            :24    kmsg.next_to_use<c9>
          1:24          -4%            :24    kmsg.next_to_watch.status<#>
          1:24          -4%            :24    kmsg.next_to_watch<#>
          1:24          -4%            :24    kmsg.next_to_watch<c8>
          1:24          -4%            :24    kmsg.time_stamp<#>
          1:24          -4%            :24    kmsg.time_stamp<#afd>


vm-kbuild-1G: qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap
Memory: 1G


To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml


Disclaimer:
Results have been estimated based on internal Intel analysis and are provided
for informational purposes only. Any difference in system hardware or software
design or configuration may affect actual performance.


Thanks,
Ying Huang

View attachment "job.yaml" of type "text/plain" (2984 bytes)

View attachment "reproduce" of type "text/plain" (594 bytes)