linux-kernel - Re: LTP: mm: overcommit

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Date:   Wed, 15 May 2019 05:03:55 -0400 (EDT)
From:   Jan Stancek <jstancek@...hat.com>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     ltp@...ts.linux.it, linux-mm@...ck.org,
        open list <linux-kernel@...r.kernel.org>,
        lkft-triage@...ts.linaro.org, dengke du <dengke.du@...driver.com>,
        petr vorel <petr.vorel@...il.com>
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 <hannes@...xchg.org>
  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
>