2019-05-15 08:42:25

by Naresh Kamboju

Subject: LTP: mm: overcommit_memory01, 03...06 failed

ltp-mm-tests failed on Linux mainline kernel 5.1.0,
* overcommit_memory01 overcommit_memory
* overcommit_memory03 overcommit_memory -R 30
* overcommit_memory04 overcommit_memory -R 80
* overcommit_memory05 overcommit_memory -R 100
* overcommit_memory06 overcommit_memory -R 200

mem.c:814: INFO: set overcommit_memory to 0
overcommit_memory.c:185: INFO: malloc 8094844 kB successfully
overcommit_memory.c:204: PASS: alloc passed as expected
overcommit_memory.c:189: INFO: malloc 32379376 kB failed
overcommit_memory.c:210: PASS: alloc failed as expected
overcommit_memory.c:185: INFO: malloc 16360216 kB successfully
overcommit_memory.c:212: FAIL: alloc passed, expected to fail

Failed test log,
https://lkft.validation.linaro.org/scheduler/job/726417#L22852

LTP version 20190115

Test case link,
https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/mem/tunable/overcommit_memory.c#L212

First bad commit:
git branch master
git commit e0654264c4806dc436b291294a0fbf9be7571ab6
git describe v5.1-10706-ge0654264c480
git repo https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

Last good commit:
git branch master
git commit 7e9890a3500d95c01511a4c45b7e7192dfa47ae2
git describe v5.1-10326-g7e9890a3500d
git repo https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

Best regards
Naresh Kamboju

2019-05-15 09:05:24

by Jan Stancek

Subject: Re: LTP: mm: overcommit_memory01, 03...06 failed

----- Original Message -----
> ltp-mm-tests failed on Linux mainline kernel 5.1.0,
> * overcommit_memory01 overcommit_memory
> * overcommit_memory03 overcommit_memory -R 30
> * overcommit_memory04 overcommit_memory -R 80
> * overcommit_memory05 overcommit_memory -R 100
> * overcommit_memory06 overcommit_memory -R 200
>
> mem.c:814: INFO: set overcommit_memory to 0
> overcommit_memory.c:185: INFO: malloc 8094844 kB successfully
> overcommit_memory.c:204: PASS: alloc passed as expected
> overcommit_memory.c:189: INFO: malloc 32379376 kB failed
> overcommit_memory.c:210: PASS: alloc failed as expected
> overcommit_memory.c:185: INFO: malloc 16360216 kB successfully
> overcommit_memory.c:212: FAIL: alloc passed, expected to fail
>
> Failed test log,
> https://lkft.validation.linaro.org/scheduler/job/726417#L22852
>
> LTP version 20190115
>
> Test case link,
> https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/mem/tunable/overcommit_memory.c#L212
>
> First bad commit:
> git branch master
> git commit e0654264c4806dc436b291294a0fbf9be7571ab6
> git describe v5.1-10706-ge0654264c480
> git repo https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>
> Last good commit:
> git branch master
> git commit 7e9890a3500d95c01511a4c45b7e7192dfa47ae2
> git describe v5.1-10326-g7e9890a3500d
> git repo https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

Heuristic changed a bit in:
commit 8c7829b04c523cdc732cb77f59f03320e09f3386
Author: Johannes Weiner <[email protected]>
Date: Mon May 13 17:21:50 2019 -0700
mm: fix false-positive OVERCOMMIT_GUESS failures

LTP tries to allocate "mem_total + swap_total":
alloc_and_check(sum_total, EXPECT_FAIL);
which now presumably falls short to trigger failure.

>
> Best regards
> Naresh Kamboju
>