linux-kernel - [mm] 8c7829b04c: ltp.overcommit

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Date:   Mon, 20 May 2019 11:20:18 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Roman Gushchin <guro@...com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...org,
        ltp@...ts.linux.it
Subject: [mm]  8c7829b04c: ltp.overcommit_memory01.fail

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

commit: 8c7829b04c523cdc732cb77f59f03320e09f3386 ("mm: fix false-positive OVERCOMMIT_GUESS failures")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

in testcase: ltp
with following parameters:

	disk: 1HDD
	test: mm-01

test-description: The LTP testsuite contains a collection of tools for testing the Linux kernel and related features.
test-url: http://linux-test-project.github.io/


on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 4G

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


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


[  554.112267 ] <<<test_start>>>
[  554.112269 ] 
[  554.115806 ] tag=overcommit_memory01 stime=1558074982
[  554.115809 ] 
[  554.119303 ] cmdline="overcommit_memory"
[  554.119306 ] 
[  554.121962 ] contacts=""
[  554.121965 ] 
[  554.124459 ] analysis=exit
[  554.124463 ] 
[  554.127140 ] <<<test_output>>>
[  554.127144 ] 
[  554.131401 ] tst_test.c:1096: INFO: Timeout per run is 0h 05m 00s
[  554.131404 ] 
[  554.136248 ] overcommit_memory.c:117: INFO: MemTotal is 4033124 kB
[  554.136251 ] 
[  554.141365 ] overcommit_memory.c:119: INFO: SwapTotal is 268435452 kB
[  554.141368 ] 
[  554.146664 ] overcommit_memory.c:123: INFO: CommitLimit is 270452012 kB
[  554.146666 ] 
[  554.151375 ] mem.c:814: INFO: set overcommit_ratio to 50
[  554.151378 ] 
[  554.155796 ] mem.c:814: INFO: set overcommit_memory to 2
[  554.155799 ] 
[  554.159951 ] overcommit_memory.c:190: INFO: malloc 538608648 kB failed
[  554.159953 ] 
[  554.164801 ] overcommit_memory.c:211: PASS: alloc failed as expected
[  554.164804 ] 
[  554.170196 ] overcommit_memory.c:190: INFO: malloc 270452012 kB failed
[  554.170199 ] 
[  554.175344 ] overcommit_memory.c:211: PASS: alloc failed as expected
[  554.175347 ] 
[  554.180932 ] overcommit_memory.c:186: INFO: malloc 134651878 kB successfully
[  554.180935 ] 
[  554.186522 ] overcommit_memory.c:205: PASS: alloc passed as expected
[  554.186524 ] 
[  554.191234 ] mem.c:814: INFO: set overcommit_memory to 0
[  554.191237 ] 
[  554.196930 ] overcommit_memory.c:186: INFO: malloc 134734122 kB successfully
[  554.196933 ] 
[  554.202738 ] overcommit_memory.c:205: PASS: alloc passed as expected
[  554.202742 ] 
[  554.208563 ] overcommit_memory.c:190: INFO: malloc 538936488 kB failed
[  554.208566 ] 
[  554.214355 ] overcommit_memory.c:211: PASS: alloc failed as expected
[  554.214357 ] 
[  554.220506 ] overcommit_memory.c:186: INFO: malloc 272468576 kB successfully
[  554.220509 ] 
[  554.226564 ] overcommit_memory.c:213: FAIL: alloc passed, expected to fail
[  554.226568 ] 
[  554.231870 ] mem.c:814: INFO: set overcommit_memory to 1
[  554.231873 ] 
[  554.237819 ] overcommit_memory.c:186: INFO: malloc 136234288 kB successfully
[  554.237821 ] 
[  554.243711 ] overcommit_memory.c:205: PASS: alloc passed as expected
[  554.243713 ] 
[  554.249791 ] overcommit_memory.c:186: INFO: malloc 272468576 kB successfully
[  554.249794 ] 
[  554.255069 ] overcommit_memory.c:205: PASS: alloc passed as expected
[  554.255073 ] 
[  554.261594 ] overcommit_memory.c:186: INFO: malloc 544937152 kB successfully
[  554.261597 ] 
[  554.267855 ] overcommit_memory.c:205: PASS: alloc passed as expected
[  554.267858 ] 
[  554.273445 ] mem.c:814: INFO: set overcommit_memory to 0
[  554.273448 ] 
[  554.278882 ] mem.c:814: INFO: set overcommit_ratio to 50
[  554.278885 ] 
[  554.282419 ] 
[  554.284170 ] Summary:
[  554.284173 ] 
[  554.287476 ] passed   8
[  554.287480 ] 
[  554.290740 ] failed   1
[  554.290743 ] 
[  554.293971 ] skipped  0
[  554.293974 ] 
[  554.297123 ] warnings 0
[  554.297126 ] 
[  554.300746 ] <<<execution_status>>>
[  554.300749 ] 
[  554.304489 ] initiation_status="ok"
[  554.304492 ] 
[  554.309762 ] duration=0 termination_type=exited termination_id=1 corefile=no
[  554.309765 ] 
[  554.313681 ] cutime=0 cstime=0
[  554.313685 ] 
[  554.316880 ] <<<test_end>>>



To reproduce:

        # build kernel
	cd linux
	cp config-5.1.0-10246-g8c7829b .config
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 prepare
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 modules_prepare
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 SHELL=/bin/bash
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 bzImage


        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz
	bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email




Thanks,
Rong Chen


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