GNU bug report logs - #21620
GMP 6.0.0a intermittent test failure on armhf

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Package: guix;

Reported by: ludo <at> gnu.org (Ludovic Courtès)

Date: Mon, 5 Oct 2015 14:34:02 UTC

Severity: normal

Done: ludo <at> gnu.org (Ludovic Courtès)

Bug is archived. No further changes may be made.

To add a comment to this bug, you must first unarchive it, by sending
a message to control AT debbugs.gnu.org, with unarchive 21620 in the body.
You can then email your comments to 21620 AT debbugs.gnu.org in the normal way.

Toggle the display of automated, internal messages from the tracker.

View this report as an mbox folder, status mbox, maintainer mbox


Report forwarded to bug-guix <at> gnu.org:
bug#21620; Package guix. (Mon, 05 Oct 2015 14:34:02 GMT) Full text and rfc822 format available.

Acknowledgement sent to ludo <at> gnu.org (Ludovic Courtès):
New bug report received and forwarded. Copy sent to bug-guix <at> gnu.org. (Mon, 05 Oct 2015 14:34:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: bug-guix <at> gnu.org
Subject: GMP 6.0.0a intermittent test failure on armhf
Date: Mon, 05 Oct 2015 16:33:21 +0200
‘tests/mpz/reuse’ intermittently fails on armhf:

  http://hydra.gnu.org/build/704686/nixlog/1/raw

Running this program in a loop easily reproduces the problem, but not
deterministically (different parts fail.)

Ludo’.




Information forwarded to bug-guix <at> gnu.org:
bug#21620; Package guix. (Mon, 05 Oct 2015 15:52:02 GMT) Full text and rfc822 format available.

Message #8 received at 21620 <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: gmp-bugs <at> gmplib.org
Cc: 21620 <at> debbugs.gnu.org, Andreas Enge <andreas.enge <at> inria.fr>
Subject: tests/mpz/reuse intermittently fails on armhf-linux-gnu
Date: Mon, 05 Oct 2015 17:44:55 +0200
[Message part 1 (text/plain, inline)]
Hello,

We observe that ‘tests/mpz/reuse’ from GMP 6.0.0 occasionally fails on
GNU/Linux on ARMv7 (hard-float ABI.)

We are building with GCC 4.9.3, using libc 2.22, and configuring with:

  --enable-fat --enable-cxx --build=arm-unknown-linux-gnueabihf

Additional system info:

--8<---------------cut here---------------start------------->8---
$ ./config.guess
neon
neon
neon
neon-unknown-linux-gnueabihf
$ ./configfsf.guess
armv7l-unknown-linux-gnueabihf
$ uname -srmpi
Linux 3.19.0-00273-ge3b61d5 armv7l unknown unknown
$ cat /proc/cpuinfo 
processor       : 0
model name      : ARMv7 Processor rev 10 (v7l)
BogoMIPS        : 9.09
Features        : half thumb fastmult vfp edsp thumbee neon vfpv3 tls vfpd32 
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x2
CPU part        : 0xc09
CPU revision    : 10

[...]

Hardware        : Freescale i.MX6 Quad/DualLite (Device Tree)
Revision        : 0000
Serial          : 0000000000000000
--8<---------------cut here---------------end--------------->8---

Example build log:

  http://hydra.gnu.org/build/704686/nixlog/1/raw

To reproduce the problem, run this command long enough:

  while ./tests/mpz/reuse ; do : ; done

Usually the failure comes up after one or two iterations.

After removing occurrences of “0 &&” in the ‘dump’ function of reuse.c.
The attached files show the output for two different failures
(mpz_tdiv_qr and mpz_mul.)

Thanks,
Ludo’.

[gmp.log (text/plain, attachment)]
[gmp.log.2 (text/plain, inline)]
failure in mpz_mul (-7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF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Information forwarded to bug-guix <at> gnu.org:
bug#21620; Package guix. (Tue, 06 Oct 2015 16:17:02 GMT) Full text and rfc822 format available.

Message #11 received at 21620 <at> debbugs.gnu.org (full text, mbox):

From: tg <at> gmplib.org (Torbjörn Granlund)
To: ludo <at> gnu.org (Ludovic Courtès)
Cc: gmp-bugs <at> gmplib.org
Subject: Re: tests/mpz/reuse intermittently fails on armhf-linux-gnu
Date: Tue, 06 Oct 2015 14:48:58 +0200
This is most surely a hardware problem.  The most common such problem is
a bad RAM chip.

Without special undocumented parameters, GMP's test suite runs the same
exact test vectors for each invocation, and GMP uses just plain old
deterministic algortihms internally.

-- 
Torbjörn
Please encrypt, key id 0xC8601622




Information forwarded to bug-guix <at> gnu.org:
bug#21620; Package guix. (Tue, 06 Oct 2015 21:34:02 GMT) Full text and rfc822 format available.

Message #14 received at 21620 <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: tg <at> gmplib.org
Cc: 21620 <at> debbugs.gnu.org, gmp-bugs <at> gmplib.org,
 Andreas Enge <andreas.enge <at> inria.fr>
Subject: Re: tests/mpz/reuse intermittently fails on armhf-linux-gnu
Date: Tue, 06 Oct 2015 18:20:11 +0200
tg <at> gmplib.org (Torbjörn Granlund) skribis:

> This is most surely a hardware problem.  The most common such problem is
> a bad RAM chip.

OK, I’ll see if I can reproduce it on another ARMv7 machine and
report back.

However, the machine in question is a build machine and it would be
surprising for the RAM issue to manifest only for this program.

Thanks,
Ludo’.

PS: Please keep 21620 <at> debbugs.gnu.org Cc’d.




Information forwarded to bug-guix <at> gnu.org:
bug#21620; Package guix. (Wed, 07 Oct 2015 02:11:02 GMT) Full text and rfc822 format available.

Message #17 received at 21620 <at> debbugs.gnu.org (full text, mbox):

From: Mark H Weaver <mhw <at> netris.org>
To: ludo <at> gnu.org (Ludovic Courtès)
Cc: 21620 <at> debbugs.gnu.org, Andreas Enge <andreas.enge <at> inria.fr>
Subject: Re: bug#21620: tests/mpz/reuse intermittently fails on armhf-linux-gnu
Date: Tue, 06 Oct 2015 22:09:21 -0400
[removed tg <at> gmplib.org and gmp-bugs <at> gmplib.org from the CC list]

ludo <at> gnu.org (Ludovic Courtès) writes:

> tg <at> gmplib.org (Torbjörn Granlund) skribis:
>
>> This is most surely a hardware problem.  The most common such problem is
>> a bad RAM chip.
>
> OK, I’ll see if I can reproduce it on another ARMv7 machine and
> report back.
>
> However, the machine in question is a build machine and it would be
> surprising for the RAM issue to manifest only for this program.

Do we have a record of which build slave performed the failed build?

     Mark




Information forwarded to bug-guix <at> gnu.org:
bug#21620; Package guix. (Wed, 07 Oct 2015 07:26:01 GMT) Full text and rfc822 format available.

Message #20 received at 21620 <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: Mark H Weaver <mhw <at> netris.org>
Cc: 21620 <at> debbugs.gnu.org, Andreas Enge <andreas.enge <at> inria.fr>
Subject: Re: bug#21620: tests/mpz/reuse intermittently fails on armhf-linux-gnu
Date: Wed, 07 Oct 2015 09:24:43 +0200
Mark H Weaver <mhw <at> netris.org> skribis:

> ludo <at> gnu.org (Ludovic Courtès) writes:
>
>> tg <at> gmplib.org (Torbjörn Granlund) skribis:
>>
>>> This is most surely a hardware problem.  The most common such problem is
>>> a bad RAM chip.
>>
>> OK, I’ll see if I can reproduce it on another ARMv7 machine and
>> report back.
>>
>> However, the machine in question is a build machine and it would be
>> surprising for the RAM issue to manifest only for this program.
>
> Do we have a record of which build slave performed the failed build?

Yes, it was on enge.fr.  Could you try on your Novena?

TIA,
Ludo’.




Information forwarded to bug-guix <at> gnu.org:
bug#21620; Package guix. (Wed, 07 Oct 2015 12:47:01 GMT) Full text and rfc822 format available.

Message #23 received at 21620 <at> debbugs.gnu.org (full text, mbox):

From: Mark H Weaver <mhw <at> netris.org>
To: ludo <at> gnu.org (Ludovic Courtès)
Cc: 21620 <at> debbugs.gnu.org, Andreas Enge <andreas.enge <at> inria.fr>
Subject: Re: bug#21620: tests/mpz/reuse intermittently fails on armhf-linux-gnu
Date: Wed, 07 Oct 2015 08:45:09 -0400
ludo <at> gnu.org (Ludovic Courtès) writes:

> Mark H Weaver <mhw <at> netris.org> skribis:
>
>> ludo <at> gnu.org (Ludovic Courtès) writes:
>>
>>> tg <at> gmplib.org (Torbjörn Granlund) skribis:
>>>
>>>> This is most surely a hardware problem.  The most common such problem is
>>>> a bad RAM chip.
>>>
>>> OK, I’ll see if I can reproduce it on another ARMv7 machine and
>>> report back.
>>>
>>> However, the machine in question is a build machine and it would be
>>> surprising for the RAM issue to manifest only for this program.
>>
>> Do we have a record of which build slave performed the failed build?
>
> Yes, it was on enge.fr.  Could you try on your Novena?

When used as a build slave, the Novena is prone to overheating.  The
best solution is to add a fan.  In the meantime, I've disabled 2 out of
the 4 cores on hydra-slave1 using the following commands:

  echo 0 > /sys/devices/system/cpu/cpu2/online
  echo 0 > /sys/devices/system/cpu/cpu3/online

      Mark




Information forwarded to bug-guix <at> gnu.org:
bug#21620; Package guix. (Wed, 07 Oct 2015 13:10:02 GMT) Full text and rfc822 format available.

Message #26 received at 21620 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Enge <andreas <at> enge.fr>
To: Mark H Weaver <mhw <at> netris.org>
Cc: 21620 <at> debbugs.gnu.org
Subject: Re: bug#21620: tests/mpz/reuse intermittently fails on armhf-linux-gnu
Date: Wed, 7 Oct 2015 15:08:40 +0200
On Wed, Oct 07, 2015 at 08:45:09AM -0400, Mark H Weaver wrote:
> When used as a build slave, the Novena is prone to overheating.  The
> best solution is to add a fan.  In the meantime, I've disabled 2 out of
> the 4 cores on hydra-slave1 using the following commands:

Which temperature is overheating? So far, I have never reached 90°,
whereas my x86 laptop goes up to 100° (then it decreases the clock speed).
It is a pity to sacrifice half of the build power! Why not use three cores?

Andreas





Information forwarded to bug-guix <at> gnu.org:
bug#21620; Package guix. (Wed, 07 Oct 2015 13:41:03 GMT) Full text and rfc822 format available.

Message #29 received at 21620 <at> debbugs.gnu.org (full text, mbox):

From: Mark H Weaver <mhw <at> netris.org>
To: Andreas Enge <andreas <at> enge.fr>
Cc: 21620 <at> debbugs.gnu.org
Subject: Re: bug#21620: tests/mpz/reuse intermittently fails on armhf-linux-gnu
Date: Wed, 07 Oct 2015 09:39:38 -0400
Andreas Enge <andreas <at> enge.fr> writes:

> On Wed, Oct 07, 2015 at 08:45:09AM -0400, Mark H Weaver wrote:
>> When used as a build slave, the Novena is prone to overheating.  The
>> best solution is to add a fan.  In the meantime, I've disabled 2 out of
>> the 4 cores on hydra-slave1 using the following commands:
>
> Which temperature is overheating?

I don't remember.  All I remember is that my Novena used to crash a lot
while doing builds, and I found a Novena forum where several users
reported overheating and the developers acknowledged the problem.  Some
users have added a fan, and there are discussions on how best to do it.

There was talk of adding automatic CPU throttling to the kernel.  I
think that work may already be done on one of the novena kernel branches
(maybe 3.19?).

I found that with only two cores enabled, the Novena became stable as a
build slave.

> It is a pity to sacrifice half of the build power!

Indeed, that's why I said that the best solution is to add a fan.

> Why not use three cores?

I tried reducing to three cores, but found that it still overheated
while doing parallel builds.

     Mark




Information forwarded to bug-guix <at> gnu.org:
bug#21620; Package guix. (Wed, 07 Oct 2015 14:29:02 GMT) Full text and rfc822 format available.

Message #32 received at 21620 <at> debbugs.gnu.org (full text, mbox):

From: tg <at> gmplib.org (Torbjörn Granlund)
To: ludo <at> gnu.org (Ludovic Courtès)
Cc: gmp-bugs <at> gmplib.org, 21620 <at> debbugs.gnu.org
Subject: Re: tests/mpz/reuse intermittently fails on armhf-linux-gnu
Date: Wed, 07 Oct 2015 16:28:27 +0200
ludo <at> gnu.org (Ludovic Courtès) writes:

  OK, I’ll see if I can reproduce it on another ARMv7 machine and
  report back.
  
Good.  Incidentally, we run nightly builds on a bunch of ARMv7 machines.

  However, the machine in question is a build machine and it would be
  surprising for the RAM issue to manifest only for this program.
  
That does not surprise me; GMP is a pretty good alternative to MemCheck.
:-)

-- 
Torbjörn
Please encrypt, key id 0xC8601622




Information forwarded to bug-guix <at> gnu.org:
bug#21620; Package guix. (Wed, 07 Oct 2015 20:33:02 GMT) Full text and rfc822 format available.

Message #35 received at 21620 <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: Mark H Weaver <mhw <at> netris.org>
Cc: 21620 <at> debbugs.gnu.org, Andreas Enge <andreas.enge <at> inria.fr>
Subject: Re: bug#21620: tests/mpz/reuse intermittently fails on armhf-linux-gnu
Date: Wed, 07 Oct 2015 22:32:43 +0200
Mark H Weaver <mhw <at> netris.org> skribis:

> ludo <at> gnu.org (Ludovic Courtès) writes:
>
>> Mark H Weaver <mhw <at> netris.org> skribis:
>>
>>> ludo <at> gnu.org (Ludovic Courtès) writes:
>>>
>>>> tg <at> gmplib.org (Torbjörn Granlund) skribis:
>>>>
>>>>> This is most surely a hardware problem.  The most common such problem is
>>>>> a bad RAM chip.
>>>>
>>>> OK, I’ll see if I can reproduce it on another ARMv7 machine and
>>>> report back.
>>>>
>>>> However, the machine in question is a build machine and it would be
>>>> surprising for the RAM issue to manifest only for this program.
>>>
>>> Do we have a record of which build slave performed the failed build?
>>
>> Yes, it was on enge.fr.  Could you try on your Novena?
>
> When used as a build slave, the Novena is prone to overheating.

Do you think it’s a likely problem?  Andreas, could you try again on
your Novena with 2 cores turned off?

Thanks,
Ludo’.




Information forwarded to bug-guix <at> gnu.org:
bug#21620; Package guix. (Thu, 08 Oct 2015 19:09:02 GMT) Full text and rfc822 format available.

Message #38 received at 21620 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Enge <andreas <at> enge.fr>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: Mark H Weaver <mhw <at> netris.org>, 21620 <at> debbugs.gnu.org,
 Andreas Enge <andreas.enge <at> inria.fr>
Subject: Re: bug#21620: tests/mpz/reuse intermittently fails on armhf-linux-gnu
Date: Thu, 8 Oct 2015 21:07:54 +0200
On Wed, Oct 07, 2015 at 10:32:43PM +0200, Ludovic Courtès wrote:
> Do you think it’s a likely problem?  Andreas, could you try again on
> your Novena with 2 cores turned off?

I have trouble believing the explanation of overheating. The gmp test
suite is carried out sequentially (they are not yet using the parallel
test harness of the autotools). So one could only imagine that the build
itself was faulty, but should then the test not fail consistently afterwards?
If I understood correctly, you used one build and ran the same test
over and over again. On the other hand, since the machine also serves as a
build machine, it is possible that some other package was built at the same
time as the tests were carried out, which may have contributed to heating.

I suggest to wait until the current build frenzy has stopped with the
merge of core-updates, and then to test by hand outside guix with only
one or two cores.

Andreas





Information forwarded to bug-guix <at> gnu.org:
bug#21620; Package guix. (Fri, 09 Oct 2015 00:54:01 GMT) Full text and rfc822 format available.

Message #41 received at 21620 <at> debbugs.gnu.org (full text, mbox):

From: Mark H Weaver <mhw <at> netris.org>
To: Andreas Enge <andreas <at> enge.fr>
Cc: Ludovic Courtès <ludo <at> gnu.org>, 21620 <at> debbugs.gnu.org,
 Andreas Enge <andreas.enge <at> inria.fr>
Subject: Re: bug#21620: tests/mpz/reuse intermittently fails on armhf-linux-gnu
Date: Thu, 08 Oct 2015 20:53:22 -0400
Andreas Enge <andreas <at> enge.fr> writes:

> On Wed, Oct 07, 2015 at 10:32:43PM +0200, Ludovic Courtès wrote:
>> Do you think it’s a likely problem?  Andreas, could you try again on
>> your Novena with 2 cores turned off?
>
> I have trouble believing the explanation of overheating. The gmp test
> suite is carried out sequentially (they are not yet using the parallel
> test harness of the autotools). So one could only imagine that the build
> itself was faulty, but should then the test not fail consistently afterwards?
> If I understood correctly, you used one build and ran the same test
> over and over again. On the other hand, since the machine also serves as a
> build machine, it is possible that some other package was built at the same
> time as the tests were carried out, which may have contributed to heating.

Exactly.

FWIW, I looked through my archive of build failure logs, and found that
the same 'reuse' test failed around September 10th on hydra-slave1, the
Novena donated by Steve Sprang.  I know that on a few occasions I forgot
to disable 2/4 cores, and that might have been one of those times.
Actually, right now hydra-slave1 has all 4 cores enabled and it seems to
be doing alright.  I also built 'gmp' again on it with 4 cores, and it
passed the 'reuse' test.  I aborted the build after that test passed,
and left the build directory in /tmp, so we could try running the
'reuse' test repeatedly if desired.

      Mark




Information forwarded to bug-guix <at> gnu.org:
bug#21620; Package guix. (Fri, 09 Oct 2015 08:28:01 GMT) Full text and rfc822 format available.

Message #44 received at 21620 <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: Andreas Enge <andreas <at> enge.fr>
Cc: Mark H Weaver <mhw <at> netris.org>, 21620 <at> debbugs.gnu.org,
 Andreas Enge <andreas.enge <at> inria.fr>
Subject: Re: bug#21620: tests/mpz/reuse intermittently fails on armhf-linux-gnu
Date: Fri, 09 Oct 2015 10:27:07 +0200
Andreas Enge <andreas <at> enge.fr> skribis:

> On Wed, Oct 07, 2015 at 10:32:43PM +0200, Ludovic Courtès wrote:
>> Do you think it’s a likely problem?  Andreas, could you try again on
>> your Novena with 2 cores turned off?
>
> I have trouble believing the explanation of overheating. The gmp test
> suite is carried out sequentially (they are not yet using the parallel
> test harness of the autotools). So one could only imagine that the build
> itself was faulty, but should then the test not fail consistently afterwards?
> If I understood correctly, you used one build and ran the same test
> over and over again. On the other hand, since the machine also serves as a
> build machine, it is possible that some other package was built at the same
> time as the tests were carried out, which may have contributed to heating.

Yes.

I think the only way to test the hypothesis is to turn off 2 processors
and run that test in a loop again, and/or to do that on a different
ARMv7 platform altogether.

Ludo’.




Information forwarded to bug-guix <at> gnu.org:
bug#21620; Package guix. (Fri, 20 Nov 2015 14:54:02 GMT) Full text and rfc822 format available.

Message #47 received at 21620 <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: Andreas Enge <andreas <at> enge.fr>
Cc: Mark H Weaver <mhw <at> netris.org>, 21620 <at> debbugs.gnu.org
Subject: Re: bug#21620: tests/mpz/reuse intermittently fails on armhf-linux-gnu
Date: Fri, 20 Nov 2015 15:53:19 +0100
ludo <at> gnu.org (Ludovic Courtès) skribis:

> Andreas Enge <andreas <at> enge.fr> skribis:
>
>> On Wed, Oct 07, 2015 at 10:32:43PM +0200, Ludovic Courtès wrote:
>>> Do you think it’s a likely problem?  Andreas, could you try again on
>>> your Novena with 2 cores turned off?
>>
>> I have trouble believing the explanation of overheating. The gmp test
>> suite is carried out sequentially (they are not yet using the parallel
>> test harness of the autotools). So one could only imagine that the build
>> itself was faulty, but should then the test not fail consistently afterwards?
>> If I understood correctly, you used one build and ran the same test
>> over and over again. On the other hand, since the machine also serves as a
>> build machine, it is possible that some other package was built at the same
>> time as the tests were carried out, which may have contributed to heating.
>
> Yes.
>
> I think the only way to test the hypothesis is to turn off 2 processors
> and run that test in a loop again, and/or to do that on a different
> ARMv7 platform altogether.

Did you have a chance to do that?  What can we conclude?

TIA!  :-)

Ludo’.




Reply sent to ludo <at> gnu.org (Ludovic Courtès):
You have taken responsibility. (Thu, 02 Jun 2016 19:44:02 GMT) Full text and rfc822 format available.

Notification sent to ludo <at> gnu.org (Ludovic Courtès):
bug acknowledged by developer. (Thu, 02 Jun 2016 19:44:02 GMT) Full text and rfc822 format available.

Message #52 received at 21620-done <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: Andreas Enge <andreas <at> enge.fr>
Cc: Mark H Weaver <mhw <at> netris.org>, 21620-done <at> debbugs.gnu.org
Subject: Re: bug#21620: tests/mpz/reuse intermittently fails on armhf-linux-gnu
Date: Thu, 02 Jun 2016 21:43:23 +0200
ludo <at> gnu.org (Ludovic Courtès) skribis:

> ludo <at> gnu.org (Ludovic Courtès) skribis:
>
>> Andreas Enge <andreas <at> enge.fr> skribis:
>>
>>> On Wed, Oct 07, 2015 at 10:32:43PM +0200, Ludovic Courtès wrote:
>>>> Do you think it’s a likely problem?  Andreas, could you try again on
>>>> your Novena with 2 cores turned off?
>>>
>>> I have trouble believing the explanation of overheating. The gmp test
>>> suite is carried out sequentially (they are not yet using the parallel
>>> test harness of the autotools). So one could only imagine that the build
>>> itself was faulty, but should then the test not fail consistently afterwards?
>>> If I understood correctly, you used one build and ran the same test
>>> over and over again. On the other hand, since the machine also serves as a
>>> build machine, it is possible that some other package was built at the same
>>> time as the tests were carried out, which may have contributed to heating.
>>
>> Yes.
>>
>> I think the only way to test the hypothesis is to turn off 2 processors
>> and run that test in a loop again, and/or to do that on a different
>> ARMv7 platform altogether.
>
> Did you have a chance to do that?  What can we conclude?

I don’t think we’ve had this problem again, which suggests that the
overheating hypothesis was right.

Closing!

Ludo’.




bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Fri, 01 Jul 2016 11:24:04 GMT) Full text and rfc822 format available.

This bug report was last modified 9 years and 42 days ago.

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