linux-kernel - Re: [LKP] [xarray] 4e99d4e957: BUG:soft_lockup-CPU##stuck

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Message-ID: <033d5570-5f05-88a1-8196-46fa75967dad@intel.com>
Date:   Thu, 20 Dec 2018 10:26:52 +0800
From:   Rong Chen <rong.a.chen@...el.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     lkp@...org, Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [LKP] [xarray] 4e99d4e957: BUG:soft_lockup-CPU##stuck_for#s



On 12/19/2018 05:54 PM, Rong Chen wrote:
>
>
> On 12/11/2018 10:29 PM, Matthew Wilcox wrote:
>> On Tue, Dec 11, 2018 at 05:54:41PM +0800, kernel test robot wrote:
>>> # To reproduce,
>>> # 1) save job-script and this script (both are attached in 0day 
>>> report email)
>>> # 2) run this script with your compiled kernel and optional env 
>>> $INSTALL_MOD_PATH
>>>
>>> kernel=$1
>>>
>>> initrds=(
>>>     /osimage/yocto/yocto-tiny-i386-2016-04-22.cgz
>>>     /lkp/lkp/lkp-i386.cgz
>>>     /osimage/deps/debian-x86_64-2016-08-31.cgz/run-ipconfig.i386_2016-09-03.cgz 
>>>
>>> )
>>>
>>> HTTP_PREFIX=https://download.01.org/0day-ci/lkp-qemu
>>> wget --timestamping "${initrds[@]/#/$HTTP_PREFIX}"
>>>
>>> {
>>>     cat "${initrds[@]//*\//}"
>>>     [[ $INSTALL_MOD_PATH ]] && (
>>>         cd "$INSTALL_MOD_PATH"
>>>
>>>
>>> To reproduce:
>>>
>>>          git clone https://github.com/intel/lkp-tests.git
>>>          cd lkp-tests
>>>          bin/lkp qemu -k <bzImage> job-script # job-script is 
>>> attached in this email
>> When I do this, the only output I get is:
>>
>> make: Entering directory '/home/willy/kernel/lkp-tests/bin/event'
>> gcc    -c -o wakeup.o wakeup.c
>> gcc  -static -o wakeup wakeup.o
>> rm -f wakeup.o
>> strip wakeup
>> make: Leaving directory '/home/willy/kernel/lkp-tests/bin/event'
>>
>> Running under sh -x, I get as far as:
>>
>> + exec /home/willy/kernel/lkp-tests/lkp-exec/qemu -k 
>> ../idrext/.build-yocto/arch/x86/boot/bzImage job-script
>>
>> Editing that script to set -x, I get to:
>>
>> + /home/willy/kernel/lkp-tests/sbin/pack -f -a x86_64 lkp-src
>> make: Entering directory '/home/willy/kernel/lkp-tests/bin/event'
>> gcc    -c -o wakeup.o wakeup.c
>> gcc  -static -o wakeup wakeup.o
>> rm -f wakeup.o
>> strip wakeup
>> make: Leaving directory '/home/willy/kernel/lkp-tests/bin/event'
>> + exit
>>
>> which would seem to indicate your 'pack' command failed with a non-zero
>> exit code?  Adding set -x to _that_ script gives me:
>>
>> + find . -type d -exec chmod g+rwx '{}' ';'
>> + chmod -R g+rw etc lib root usr
>> + '[' -d /osimage/addon-x86_64 ']'
>> + gzip -n -9 /home/willy/.lkp/cache/lkp-x86_64.cpio
>> + mv -f /home/willy/.lkp/cache/lkp-x86_64.cpio.gz 
>> /home/willy/.lkp/cache/lkp-x86_64.cgz
>> + [[ -n '' ]]
>> + [[ -n '' ]]
>> + exit
>>
>> I'm using your top-of-tree lkp-tests, commit
>> e28c726dfe85e3e595ba4776a4eb92f2559d3ac0
>>
>> By the way, I took this kernel config and ran it under one of your other
>> test cases (the one which runs Trinity) and didn't see a boot problem,
>> so either it's something specific to this setup, or the problem got
>> fixed between this commit and current top-of-tree.
>
> Please accept my apologies for taking your time, the reproduce tool 
> was broken for a long time, and it's fixed now.
> if it can't be reproduced, here is the original 
> bzImage(https://download.01.org/0day-ci/lkp-qemu/fbc/4e99d4e9579d3b950bf4b38d0d64eb1b9be78761/).

Hi,

It should be a false positive too, The test VM are usually overloaded 
much to improve test density, we will pay attention to the issue.

Best Regards,
Rong Chen