Bus error while building Erlang

Hi!

Recent build of erlang package failed on sparc architecture
(http://buildd.debian.org/build.php
?&pkg=erlang&arch=sparc&file=log).
I cannot find a reason looking at the log file, and I don't
have an
access to any sparc machine to debug the failure.

Could someone help me with an access to one of Debian sparc
machines?
I tried to install Debian in QEMU but it emulates an old
hardware
which is unsupported by sid.

Cheers!
-- 
Sergei Golovan

P.S. Please, CC me as I haven't subscribed to debian-sparc.


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On Sat, Nov 24, 2007 at 01:34:04PM +0300, Sergei Golovan
wrote:
> Hi!
> 
> Recent build of erlang package failed on sparc
architecture
> (http://buildd.debian.org/build.php
?&pkg=erlang&arch=sparc&file=log).
> I cannot find a reason looking at the log file, and I
don't have an
> access to any sparc machine to debug the failure.
> 
> Could someone help me with an access to one of Debian
sparc machines?
> I tried to install Debian in QEMU but it emulates an
old hardware
> which is unsupported by sid.

You can log into sperger.debian.org, a recently set up
developer-access
sparc machine, and try the build there.

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On 11/25/07, Josip Rodin <joyentuzijast.net> wrote:
>
> You can log into sperger.debian.org, a recently set up
developer-access
> sparc machine, and try the build there.

Thanks! It works!

-- 
Sergei Golovan


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On 11/25/07, Josip Rodin <joyentuzijast.net> wrote:
>
> You can log into sperger.debian.org, a recently set up
developer-access
> sparc machine, and try the build there.

Another problem is that sid chroot doesn't contain all
necessary
packages installed. Specifically: debhelper (>= 5.0.0)
autoconf (>=
2.50) openssl libssl-dev m4 libncurses5-dev quilt
autotools-dev
unixodbc-dev bison flex libsctp-dev

How could they be installed?

-- 
Sergei Golovan


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On Sun, Nov 25, 2007 at 03:53:06PM +0300, Sergei Golovan
wrote:
> On 11/25/07, Josip Rodin <joyentuzijast.net> wrote:
> > You can log into sperger.debian.org, a recently
set up developer-access
> > sparc machine, and try the build there.
> 
> Another problem is that sid chroot doesn't contain all
necessary
> packages installed. Specifically: debhelper (>=
5.0.0) autoconf (>=
> 2.50) openssl libssl-dev m4 libncurses5-dev quilt
autotools-dev
> unixodbc-dev bison flex libsctp-dev
> 
> How could they be installed?

I *think* you can ask for those things by filing a ticket in
the RT.

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On Sun, Nov 25, 2007 at 03:53:37PM +0100, BERTRAND Joël
wrote:
> >Recent build of erlang package failed on sparc
architecture
> >(http://buildd.debian.org/build.php
?&pkg=erlang&arch=sparc&file=log).
> >I cannot find a reason looking at the log file, and
I don't have an
> >access to any sparc machine to debug the failure.
> 
> 	I have seen the same bus error with gcc 4.x (internal
error that 
> returns a bus error on Sbus based sparc _and_ sparc64
linux boxes). I'm 
> trying to find this bug for a long time without any
success. I never 
> have seen this bug on PCI based sparc64 boxes. Please
note that I'm not 
> sure that this trouble comes from Sbus subsystem  I
suspect a bug in 
> sparc/sparc64 kernel.

FWIW, the box that produced that log linked above was
running 2.6.23.8, and
it's a sparc64 CPU with PCI.

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Sergei Golovan wrote:
> Hi!

	Hello,

> Recent build of erlang package failed on sparc
architecture
> (http://buildd.debian.org/build.php
?&pkg=erlang&arch=sparc&file=log).
> I cannot find a reason looking at the log file, and I
don't have an
> access to any sparc machine to debug the failure.

	I have seen the same bus error with gcc 4.x (internal error
that 
returns a bus error on Sbus based sparc _and_ sparc64 linux
boxes). I'm 
trying to find this bug for a long time without any success.
I never 
have seen this bug on PCI based sparc64 boxes. Please note
that I'm not 
sure that this trouble comes from Sbus subsystem  I
suspect a bug in 
sparc/sparc64 kernel.

Tested boxes :
- SS5 (MS/85), 256 MB -> bug (but system not stable)
- SS20 (SM71), 512 MB -> bug (but system not stable)
- SS20 (RT626) 512 MB -> system crashes before I can
launch a gcc 
- U1E (U1/170), 640 MB -> bug
- U2E (2*U2/300), 2048 MB -> bug
- U5 (U2/270), 512 MB -> works fine
- U60 (2*U2/450), 1024 MB -> works fine
- U80 (4*U2/450), 2048 MB -> works fine
- U420 (4*U2/450), 4096 MB -> works fine

	Today, I don't try to debug on sparc32 due to a bad support
of SMP 
boxes (even in UP, I have some trouble with sparc32). I use
a U2/SMP, 
but this bug randomly appears and is very difficult to
reproduce. I have 
seen if only with iceape (all versions) and gcc 4.x.
In a first time, I though that my U2 was broken, or that
fans were 
halted for some reasons. I have used SUNvts on Solaris9 to
test hardware 
and it don't return error.

	I have seen this bug on 2.6.23.1 kernel. Now, my U2 runs
with a 
2.6.23.8 (built by gcc-4.1) and I don't see any bus error
when I write 
these lines.

	Regards,

	JKB

CC: sparc kernel mailing list


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Josip Rodin wrote:
> On Sun, Nov 25, 2007 at 03:53:37PM +0100, BERTRAND Joël
wrote:
>>> Recent build of erlang package failed on sparc
architecture
>>> (http://buildd.debian.org/build.php
?&pkg=erlang&arch=sparc&file=log).
>>> I cannot find a reason looking at the log file,
and I don't have an
>>> access to any sparc machine to debug the
failure.
>> 	I have seen the same bus error with gcc 4.x
(internal error that 
>> returns a bus error on Sbus based sparc _and_
sparc64 linux boxes). I'm 
>> trying to find this bug for a long time without any
success. I never 
>> have seen this bug on PCI based sparc64 boxes.
Please note that I'm not 
>> sure that this trouble comes from Sbus subsystem
 I
suspect a bug in 
>> sparc/sparc64 kernel.
> 
> FWIW, the box that produced that log linked above was
running 2.6.23.8, and
> it's a sparc64 CPU with PCI.

	For me, it's the same bug... I've never seen it on PCI
boxes, but 
result is the same :-(

	Regards,

	JKB


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On Nov 26, 2007 1:53 AM, BERTRAND Joël <joel.bertrandsystella.fr> wrote:
> Sergei Golovan wrote:
> > Hi!
>
>         Hello,
>
> > Recent build of erlang package failed on sparc
architecture
> > (http://buildd.debian.org/build.php
?&pkg=erlang&arch=sparc&file=log).
> > I cannot find a reason looking at the log file,
and I don't have an
> > access to any sparc machine to debug the failure.

I've been plagued by bus errors on my SS10 and U1E in the
past whilst
using Debian Etch. It appeared to be a bug in the domain
name => IP
code - which caused all the stuff I wanted to run on it to
immediately
fail.

What notes I could find on bus errors on Sparc led me to
believe that
this error was caused by unaligned memory accesses. (please
correct me
if I'm talking out of my arse) I guessed that the problem
was
somewhere in libc. (and hence inaccessible for me) The
problems all
went away when I upgraded the boxes to the new version of
libc in
Lenny. (before Sparc32 support was dropped)

I'm guessing that something in erlc is doing a cast when it
should do
a memcopy. However I've never even tried to get to the
bottom of this
on my boxes, and given that the U1E now works fine, I've
never had any
reason to.

Hope this is useful,

-- 

Julian Calaby

Email: julian.calabygmail.com

On 11/25/07, Josip Rodin <joyentuzijast.net> wrote:
> On Sat, Nov 24, 2007 at 01:34:04PM +0300, Sergei
Golovan wrote:
> > Hi!
> >
> > Recent build of erlang package failed on sparc
architecture
> > (http://buildd.debian.org/build.php
?&pkg=erlang&arch=sparc&file=log).
> > I cannot find a reason looking at the log file,
and I don't have an
> > access to any sparc machine to debug the failure.
> >
> > Could someone help me with an access to one of
Debian sparc machines?
> > I tried to install Debian in QEMU but it emulates
an old hardware
> > which is unsupported by sid.
>
> You can log into sperger.debian.org, a recently set up
developer-access
> sparc machine, and try the build there.

Unfortunately, I cannot reproduce the bug on sperger. Erlang
builds
fine. So, it looks like the bug is indeed in gcc or kernel
or glibs or
whatever (not in erlang). The questions are now how to debug
it and
where to ask for help with it.

-- 
Sergei Golovan


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