Re: [LTP] [mm] 8c7829b04c: ltp.overcommit_memory01.fail

[Jan Stancek]

----- Original Message -----
> FYI, we noticed the following commit (built with gcc-7):
> 
> commit: 8c7829b04c523cdc732cb77f59f03320e09f3386 ("mm: fix false-positive
> OVERCOMMIT_GUESS failures")

This matches report from Naresh:
  http://lists.linux.it/pipermail/ltp/2019-May/011962.html

> 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@xxxxxxxxx>
> 
> 
> [  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
> 
> 
> 
> --
> Mailing list info: https://lists.linux.it/listinfo/ltp
>