Re: [LKP] More information please. Re: [fs] 54cc07a761: BUG: kernel test crashed

From	Dave Jones <davej@codemonkey.org.uk>
Newsgroups	linux.kernel
Subject	Re: [LKP] More information please. Re: [fs] 54cc07a761: BUG: kernel test crashed
Date	2016-07-26 23:20 +0200
Message-ID	<rZhVE-7bN-3@gated-at.bofh.it> (permalink)
References	(1 earlier) <rYTzZ-8r9-45@gated-at.bofh.it> <rZbGy-36b-13@gated-at.bofh.it> <rZc9z-3vF-13@gated-at.bofh.it> <rZcjf-3yU-17@gated-at.bofh.it> <rZgPU-6zH-3@gated-at.bofh.it>
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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

Thread

Re: [LKP] More information please. Re: [fs] 54cc07a761: BUG: kernel  test crashed Fengguang Wu <fengguang.wu@intel.com> - 2016-07-26 16:40 +0200
  Re: [LKP] More information please. Re: [fs] 54cc07a761: BUG: kernel test crashed ebiederm@xmission.com (Eric W. Biederman) - 2016-07-26 17:10 +0200
    Re: [LKP] More information please. Re: [fs] 54cc07a761: BUG: kernel  test crashed Fengguang Wu <fengguang.wu@intel.com> - 2016-07-26 17:20 +0200
      Re: [LKP] More information please. Re: [fs] 54cc07a761: BUG: kernel test crashed ebiederm@xmission.com (Eric W. Biederman) - 2016-07-26 22:10 +0200
        Re: [LKP] More information please. Re: [fs] 54cc07a761: BUG: kernel  test crashed Dave Jones <davej@codemonkey.org.uk> - 2016-07-26 23:20 +0200
      Re: [LKP] More information please. Re: [fs] 54cc07a761: BUG: kernel  test crashed Dave Jones <davej@codemonkey.org.uk> - 2016-07-26 23:20 +0200

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