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From:   Andy Lutomirski <luto@kernel.org>
Date:   Wed, 11 Jul 2018 10:36:13 -0700
Message-ID: <CALCETrXEBhNsxZtbiG+Mh2r3hka27qRgn6J=mx-krXq4n86Ayg@mail.gmail.com>
Subject: Re: Kernel 4.17.4 lockup
To:     "H.J. Lu" <hjl.tools@gmail.com>
Cc:     Dave Hansen <dave.hansen@intel.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Andy Lutomirski <luto@kernel.org>,
        Mel Gorman <mgorman@suse.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Rik van Riel <riel@surriel.com>,
        Minchan Kim <minchan@kernel.org>
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On Wed, Jul 11, 2018 at 10:29 AM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Wed, Jul 11, 2018 at 9:53 AM, H.J. Lu <hjl.tools@gmail.com> wrote:
>> On Wed, Jul 11, 2018 at 9:49 AM, Dave Hansen <dave.hansen@intel.com> wrote:
>>> On 07/11/2018 09:29 AM, H.J. Lu wrote:
>>>>>> # It takes about 3 hour to bootstrap x86-64 GCC and 3 hour to run tests,
>>>>>> TIMEOUT=480
>>>>>> # Run it every hour,
>>>>>> 30 * * * * /export/gnu/import/git/gcc-test-x32/gcc-build -mx32
>>>>>> --with-pic > /dev/null 2>&1
>>>>> Oh, fun, one of those.
>>>>>
>>>>> How long does it take to reproduce?
>>>> About 5 hours.
>>>
>>> It would be much appreciated if you can get a console of some kind on
>>> that system and try to get a full KASAN oops out of it.  Serial, usb
>>> debug, or maybe netconsole would probably work.
>>
>> I don't have serial ports. I will try netconsole.
>>
>>> I'll also try to get it running on a big system and see if it triggers
>>> faster there.
>>
>> I have seen it on machines with various amounts of cores and RAMs.
>> It triggers the fastest on 8 cores with 6GB RAM reliably.
>
> Here is the first kernel message.

I find myself wondering if this is somehow the same issue as below:

https://syzkaller.appspot.com/bug?id=2c33dff2a2138d709b43671603dc01d65b28a689

We could plausibly have a problem with the entry code, but I don't see
anything relevant in the changelog.