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[EP-tech] Re: Apache segfault



OK,

First of all try to remove the two plugins one at a time and in the 
meantime start apache to see which one breaks apache.

Building apache from sources is not very dramatic, you just have to find 
an "easy guide". I'll search later to see if I find any and I will come 
back with the link. Do you run any other sites through the same apache 
(which may use PHP, python or any other server side language)?

In order to check a binary's linked libraries you can do so using the 
ldd command followed by the full path of the binary. In my system 
(Debian), running ldd on the apache2 binary returns:

# ldd /usr/sbin/apache2
.    linux-vdso.so.1 (0x00007fff8bce5000)
     libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f6c588ad000)
     libaprutil-1.so.0 => /usr/lib/x86_64-linux-gnu/libaprutil-1.so.0 
(0x00007f6c58684000)
     libapr-1.so.0 => /usr/lib/x86_64-linux-gnu/libapr-1.so.0 
(0x00007f6c5844e000)
     libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 
(0x00007f6c58231000)
     libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f6c57e88000)
     libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007f6c57c82000)
     librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f6c57a7a000)
     libcrypt.so.1 => /lib/x86_64-linux-gnu/libcrypt.so.1 
(0x00007f6c57843000)
     libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f6c5763e000)
     libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 
(0x00007f6c57415000)
     /lib64/ld-linux-x86-64.so.2 (0x00007f6c58dc9000)

Moreover, to see how many versions of a library are installed in your 
system you can use ldconfig with the -p option. So for example in the 
same system:
# ldconfig -p | grep -i expat
     libexpatw.so.1 (libc6,x86-64) => 
/usr/lib/x86_64-linux-gnu/libexpatw.so.1
     libexpatw.so (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libexpatw.so
     libexpat.so.1 (libc6,x86-64) => /lib/x86_64-linux-gnu/libexpat.so.1
     libexpat.so (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libexpat.so

Using dpkg-query in a debian-based system (like Ubuntu), you can see 
which file is installed by which package, so in my system again:

# dpkg-query  -S /usr/lib/x86_64-linux-gnu/libexpatw.so
libexpat1-dev:amd64: /usr/lib/x86_64-linux-gnu/libexpatw.so

I see that libexpat1-dev package installed the library of libexpatw in it.

Maybe you can use these commands in your system to see what's wrong.

On 25/09/2015 01:01 ??, Richard Jones wrote:
> Hi George,
>
>
>     It would be good if you could provide the relevant apache logs.
>     Moreover, if you uninstall the packages you mentioned you
>     installed yesterday, does apache work OK?
>
>
> I haven't tried yet, but I would expect so - it broke the instant I 
> installed them!  I may back them out to confirm, but I need them 
> installed for the XSLT import plugins to work.
>
>     In the link you provided it's talking about the expat library and
>     I'm not sure the packages you've mentioned are related to that.
>
>
> I'm not totally clear either, but they're both XML related, so seemed 
> like a reasonable bet.
>
>     Nonetheless, what the link implies as a solution (*IF* this is
>     your problem), is to install apache through sources so as to
>     remove the double-linking with lib-expat.
>
>
> Hm, that's what I was afraid of :)  I'm not sure how to do that, or 
> what it means to "remove the double-linking", so I'm hesitant to go 
> down that route just yet.
>
> Cheers,
>
> Richard
>
>
>
>     George.
>
>
>     On 25/09/2015 12:03 ??, Richard Jones wrote:
>>     Hi Folks,
>>
>>     I think that I'm experiencing this error:
>>
>>     http://wiki.eprints.org/w/Troubleshooting#Apache_Crashes_with_a_segmentation_fault
>>
>>     Yesterday I installed libxml-libxml-perl and libxml-libxslt-perl
>>     to fix a problem with XSLT crosswalks not being loaded, and now
>>     I'm unable to restart apache.
>>
>>     I installed apache2 on my ubuntu system via the aptitude (so, not
>>     from source), and I installed eprints from source and manually
>>     installed the dependencies via aptitude.
>>
>>     The troubleshooting guide tells me what the problem might be, but
>>     doesn't have a fix - does anyone know how to resolve?
>>
>>     Cheers,
>>
>>     Richard
>>
>>     -- 
>>
>>     Richard Jones,
>>
>>     Founder, Cottage Labs
>>     t: @richard_d_jones, @cottagelabs
>>     w: http://cottagelabs.com
>>
>>
>>
>>     *** Options:http://mailman.ecs.soton.ac.uk/mailman/listinfo/eprints-tech
>>     *** Archive:http://www.eprints.org/tech.php/
>>     *** EPrints community wiki:http://wiki.eprints.org/
>>     *** EPrints developers Forum:http://forum.eprints.org/
>
>
>     -- 
>     George Mamalakis
>
>     IT and Security Officer,
>     Electrical and Computer Engineer (Aristotle Univ. of Thessaloniki),
>     PhD (Aristotle Univ. of Thessaloniki),
>     MSc (Imperial College of London)
>
>     School of Electrical and Computer Engineering
>     Aristotle University of Thessaloniki
>
>     phone number : +30 (2310) 994379
>
>
>
>     *** Options:
>     http://mailman.ecs.soton.ac.uk/mailman/listinfo/eprints-tech
>     *** Archive: http://www.eprints.org/tech.php/
>     *** EPrints community wiki: http://wiki.eprints.org/
>     *** EPrints developers Forum: http://forum.eprints.org/
>
>
>
>
> -- 
>
> Richard Jones,
>
> Founder, Cottage Labs
> t: @richard_d_jones, @cottagelabs
> w: http://cottagelabs.com
>
>
>
> *** Options: http://mailman.ecs.soton.ac.uk/mailman/listinfo/eprints-tech
> *** Archive: http://www.eprints.org/tech.php/
> *** EPrints community wiki: http://wiki.eprints.org/
> *** EPrints developers Forum: http://forum.eprints.org/


-- 
George Mamalakis

IT and Security Officer,
Electrical and Computer Engineer (Aristotle Univ. of Thessaloniki),
PhD (Aristotle Univ. of Thessaloniki),
MSc (Imperial College of London)

School of Electrical and Computer Engineering
Aristotle University of Thessaloniki

phone number : +30 (2310) 994379


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