From: Dave Jones <davej@codemonkey.org.uk>
To: lkp@lists.01.org
Subject: Re: More information please. Re: [fs] 54cc07a761: BUG: kernel test crashed
Date: Tue, 26 Jul 2016 17:18:59 -0400 [thread overview]
Message-ID: <20160726211859.GB9577@codemonkey.org.uk> (raw)
In-Reply-To: <87wpk8p49p.fsf@x220.int.ebiederm.org>
[-- Attachment #1: Type: text/plain, Size: 954 bytes --]
On Tue, Jul 26, 2016 at 02:50:58PM -0500, Eric W. Biederman wrote:
> > Yes that's the right directions to follow. We'll make the reports more
> > understandable and the test/bisects more reliable.
>
> Thanks. Does trinity have a random seed it can export/import to rerun
> the same tests? I ask because there was a failure these tests caught
> that if the right kernel options was enabled was 100% reliable and it
> blamed a commit 10 patches down from the indicated commit.
It does log the random seed on startup, and can replay it with the -s option
There is some variance if you were to do two runs with the same seed back
to back, because on startup, it walks /proc & /sys, and they'd see different things
so for eg "read() from fd 100" might mean something entirely different.
But as the testbot runs a pretty minimal userspace, only runs trinity once,
and really early in boot, this point might not matter.
Dave
WARNING: multiple messages have this Message-ID (diff)
From: Dave Jones <davej@codemonkey.org.uk>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>,
containers@lists.linux-foundation.org, lkp@01.org,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [LKP] More information please. Re: [fs] 54cc07a761: BUG: kernel test crashed
Date: Tue, 26 Jul 2016 17:18:59 -0400 [thread overview]
Message-ID: <20160726211859.GB9577@codemonkey.org.uk> (raw)
In-Reply-To: <87wpk8p49p.fsf@x220.int.ebiederm.org>
On Tue, Jul 26, 2016 at 02:50:58PM -0500, Eric W. Biederman wrote:
> > Yes that's the right directions to follow. We'll make the reports more
> > understandable and the test/bisects more reliable.
>
> Thanks. Does trinity have a random seed it can export/import to rerun
> the same tests? I ask because there was a failure these tests caught
> that if the right kernel options was enabled was 100% reliable and it
> blamed a commit 10 patches down from the indicated commit.
It does log the random seed on startup, and can replay it with the -s option
There is some variance if you were to do two runs with the same seed back
to back, because on startup, it walks /proc & /sys, and they'd see different things
so for eg "read() from fd 100" might mean something entirely different.
But as the testbot runs a pretty minimal userspace, only runs trinity once,
and really early in boot, this point might not matter.
Dave
next prev parent reply other threads:[~2016-07-26 21:18 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-23 21:20 [fs] 54cc07a761: BUG: kernel test crashed kernel test robot
2016-07-23 21:20 ` kernel test robot
[not found] ` <5793dfa5.mvXPj4LJOS0dlz3i%xiaolong.ye-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2016-07-23 21:52 ` Eric W. Biederman
2016-07-23 21:52 ` Eric W. Biederman
2016-07-23 21:52 ` Eric W. Biederman
2016-07-25 18:57 ` More information please. " Eric W. Biederman
2016-07-25 18:57 ` Eric W. Biederman
2016-07-25 18:57 ` Eric W. Biederman
[not found] ` <877fc9a6mb.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org>
2016-07-26 14:35 ` [LKP] " Fengguang Wu
2016-07-26 14:35 ` Fengguang Wu
2016-07-26 14:35 ` Fengguang Wu
[not found] ` <20160726143545.GA23656-q6ZYBFIlbFFi0tQiZxhdj1DQ4js95KgL@public.gmane.org>
2016-07-26 14:52 ` [LKP] " Eric W. Biederman
2016-07-26 14:52 ` Eric W. Biederman
2016-07-26 14:52 ` Eric W. Biederman
[not found] ` <87vazsv4cn.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org>
2016-07-26 15:13 ` [LKP] " Fengguang Wu
2016-07-26 15:13 ` Fengguang Wu
2016-07-26 15:13 ` Fengguang Wu
[not found] ` <20160726151344.GB8811-q6ZYBFIlbFFi0tQiZxhdj1DQ4js95KgL@public.gmane.org>
2016-07-26 19:50 ` [LKP] " Eric W. Biederman
2016-07-26 19:50 ` Eric W. Biederman
2016-07-26 19:50 ` Eric W. Biederman
2016-07-26 21:18 ` Dave Jones [this message]
2016-07-26 21:18 ` [LKP] " Dave Jones
[not found] ` <87wpk8p49p.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org>
2016-07-26 21:18 ` Dave Jones
2016-07-26 21:15 ` Dave Jones
2016-07-26 21:15 ` Dave Jones
2016-07-26 21:15 ` [LKP] " Dave Jones
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