[lug] A head scratcher for your weekend

[Davide Del Vento]

Have you tried strace and/or ltrace? Lots of output you'll need to
sift (grep) through, but you should be able to get some more clues if
not the solution...

On Sun, May 20, 2018 at 7:43 AM, Matt Bidwell <mbidwell at gmail.com> wrote:
> Shouldn't be, but it got me to thinking about Apparmor. So I disabled that
> in grub and rebooted. Unfortunately, still no progress. -Matt
>
> On 05/19/2018 08:36 PM, stimits at comcast.net wrote:
>>
>> Maybe SElinux?
>> ----- Original Message -----
>> From: Matt Bidwell <mbidwell at gmail.com>
>> To: lug at lug.boulder.co.us
>> Sent: Sat, 19 May 2018 22:26:11 -0000 (UTC)
>> Subject: Re: [lug] A head scratcher for your weekend
>> Unfortunatly they both appear to be 64bit and there only is one version
>> of libQt5Core.
>> # file /usr/bin/mythbackend
>> /usr/bin/mythbackend: ELF 64-bit LSB pie executable x86-64, version 1
>> (GNU/Linux), dynamically linked, interpreter
>> /lib64/ld-linux-x86-64.so.2, for GNU/Linux 3.2.0,
>> BuildID[sha1]=293e8e4f8ef60e3a1d9a0133b50070cc837d008c, stripped
>> # file /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.10.1
>> /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.10.1: ELF 64-bit LSB shared
>> object x86-64, version 1 (GNU/Linux), dynamically linked, interpreter
>> /lib64/ld-linux-x86-64.so.2,
>> BuildID[sha1]=29089e33a2458624bd5d495a5698237fedaa2a91, for GNU/Linux
>> 3.17.0, stripped
>>
>> LD_LIBRARY_PATH was low hanging fruit that I already checked out
>> leaving...
>> RPATH and RUNPATH which I'm less sure how to hunt down.
>> #readelf --dynamic /usr/bin/mythbackend | grep PATH
>> returns nothing but web examples show me that I should get both a hit on
>> RPATH and RUNPATH.
>> Thanks for the response.
>> On 05/19/2018 06:29 AM, Davide Del Vento wrote:
>>  > Often a 32 vs 64 bit causes this problem. Try
>>  >
>>  > file /usr/bin/mythbackend
>>  >
>>  > file /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.10.1
>>  >
>>  > and make sure they are both 64 bit (assuming that the directory name
>>  > for libQt5Core.so is correct).
>>  >
>>  > Also check LD_LIBRARY_PATH, RPATH, RUNPATH and /etc/ld.so.conf and
>>  > make sure there isn't another location with higher priority than
>>  > /usr/lib/x86_64-linux-gnu/ containing a file called libQt5Core.so.5
>>  > (which again, could have 32/64 bit mismatch or be a broken link or
>>  > something).
>>  >
>>  > HTH
>>  > Davide
>>  >
>>  > On Sat, May 19, 2018 at 5:28 AM, Matt Bidwell <mbidwell at gmail.com>
>> wrote:
>>  >> Library is installed, program can find other libraries in that
>> directory.
>>  >> Reinstalling or downgrading either the package or the library didn't
>> fix
>>  >> it.... What could have happened to my system?
>>  >> # ls -alh /usr/lib/x86_64-linux-gnu/libQt5Core.so.5*
>>  >> lrwxrwxrwx 1 root root 20 May 12 07:03
>>  >> /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 -> libQt5Core.so.5.10.1
>>  >> lrwxrwxrwx 1 root root 20 May 12 07:03
>>  >> /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.10 -> libQt5Core.so.5.10.1
>>  >> -rw-r--r-- 1 root root 5.0M May 12 07:03
>>  >> /usr/lib/x86_64-linux-gnu/libQt5Core.so.5.10.1
>>  >>
>>  >> ldd /usr/bin/mythbackend
>>  >> ...
>>  >> libQt5Script.so.5 => /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
>>  >> (0x00007f4eb42f8000)
>>  >> libQt5Core.so.5 => not found
>>  >> libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
>>  >> (0x00007f4eb40d8000)
>>  >> ...
>>  >>
>>  >> This is very perplexing.
>>  >> _______________________________________________
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>>
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>
> _______________________________________________
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