linux-kernel - Re: [LKP] 5404a7f1c2 [ 90.902541] watchdog: BUG: soft lockup

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Date:   Tue, 18 Dec 2018 04:17:10 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     kernel test robot <rong.a.chen@...el.com>
Cc:     linux-kernel@...r.kernel.org, LKP <lkp@...org>
Subject: Re: [LKP] 5404a7f1c2 [ 90.902541] watchdog: BUG: soft lockup - CPU#0
 stuck for 22s! [swapper:1]

On Tue, Dec 18, 2018 at 08:20:28AM +0800, kernel test robot wrote:
> Greetings,
> 
> 0day kernel testing robot got the below dmesg and the first bad commit is
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> 
> commit 5404a7f1c21cfda061712bedf2d06cc0f6c755e9

I feel like you're wasting my time.  This is the fourth time in a row
you've reported something I can't reproduce.  At least this time the
instructions work, but I've tried it a dozen times and it doesn't produce
the error you're showing.

$ git branch
* (HEAD detached at 5404a7f1c21c)
...
[    0.000000] Linux version 4.20.0-rc1-00012-g5404a7f1c21c (willy@...o) (gcc version 8.2.0 (Debian 8.2.0-9)) #4 Mon Dec 17 23:28:21 EST 2018
...
[    9.848471] test_uuid: all 18 tests passed
[   11.019267] XArray: 19496249 of 19496249 tests passed

Your logs show it failing every time.  I can't help but wonder if it's
something else in your setup that's causing it to fail -- maybe the
machines doing the testing are overloaded?