Meqserver in ppa segfaults on startup

[bennahugo]

There is a problem with the meqtrees build on the PPA

Purged and installed latest set of meqtrees deb files from the radio astronomy ppa. Meqtrees GUI opens up, but as soon as I start a server I get a segfault.

Building meqtrees from source directly from the master branch seems to resolve the issue. Meqserver starts up successfully

[gijzelaerr]

hi, thanks for reporting this problem.

Are you using Ubuntu 14.04? What casacore version do you have installed? Is there anything else to report about your setup or is it just a plain Ubuntu 14.04 isntall with our repository enabled?

@o-smirnov do you know what may be causing this? Did you change things in the trunk?

[bennahugo]

Hi Gijs

Using Ubuntu 14.04 and I'm sticking to casacore and libcasacore-dev from radio astronomy ppa casacore-data/trusty,now 20150706-1trusty all [installed,automatic] casacore2/trusty,now 2.0.0-1trusty amd64 [installed] libcasacore-dev/trusty,now 1.7.0-2trusty amd64 [installed] libcasacore1/trusty,now 1.7.0-2trusty amd64 [installed,automatic] libcasacore2/trusty,now 2.0.0-1trusty amd64 [installed,automatic]

I've tested the meqtrees debs on 2 machines. Both fail.

[gijzelaerr]

What happens if you remove the casacore2 and libcasacore2 packages?

2015-07-09 10:56 GMT+02:00 bennahugo notifications@github.com:

Hi Gijs

Using Ubuntu 14.04 and I'm sticking to casacore and libcasacore-dev from radio astronomy ppa casacore-data/trusty,now 20150706-1trusty all [installed,automatic] casacore2/trusty,now 2.0.0-1trusty amd64 [installed] libcasacore-dev/trusty,now 1.7.0-2trusty amd64 [installed] libcasacore1/trusty,now 1.7.0-2trusty amd64 [installed,automatic] libcasacore2/trusty,now 2.0.0-1trusty amd64 [installed,automatic]

I've tested the meqtrees debs on 2 machines. Both fail.

— Reply to this email directly or view it on GitHub https://github.com/ska-sa/meqtrees/issues/863#issuecomment-119879912.

Gijs Molenaar http://pythonic.nl

[bennahugo]

Still the same seqfault.. have the following installed:

casacore-data/trusty,now 20150706-1trusty all [installed,automatic] libcasacore-dev/trusty,now 1.7.0-2trusty amd64 [installed] libcasacore1/trusty,now 1.7.0-2trusty amd64 [installed,automatic] libmeqtrees-timba0/trusty,now 1.3.4-1trusty amd64 [installed,automatic] meqtrees/trusty,now 1.3.3-2trusty amd64 [installed] meqtrees-timba/trusty,now 1.3.4-1trusty amd64 [installed,automatic] python-meqtrees-cattery/trusty,now 1.3.3-2trusty amd64 [installed,automatic] python-meqtrees-timba/trusty,now 1.3.4-1trusty amd64 [installed,automatic]

[jfunction]

Hello, I'm wondering if there is any progress on this? I am having the same issue.

The output of dmesg shows that the offending library is likely libcasa_synthesis.so as in:

[869144.655517] traps: meqserver[12677] general protection ip:7f932a63d598 sp:7fffecf90160 error:0 in libcasa_synthesis.so[7f932a251000+c07000]

[gijzelaerr]

what version are you using?

[gijzelaerr]

I can start meqbrowser.py on jake and with that a meqserver without segfault.

cattery 1.4.0 timba 1.5.0

[jfunction]

Does this help?

sudo apt-cache policy meqtrees
meqtrees:
  Installed: 1.4.0-0trusty
  Candidate: 1.4.0-0trusty
  Version table:
 *** 1.4.0-0trusty 0
        500 http://ppa.launchpad.net/radio-astro/main/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

I just installed meqtrees from the PPA on 14.04

[jfunction]

If I try install casarest it wants to remove libcasacore-dev and lwimager Also, I don't have meqtrees-timba - it wants to install casarest for that.

Should I try installing these?

[gijzelaerr]

meqtrees-timba is the actual browser. How do you install the browser?

casarest should replace lwimager. libcasacore-dev is depricated (by libcasacore2-dev).

[jfunction]

I can't remember how I installed it initially, but I installed meqtrees-timba now and am getting a new error:

/usr/bin/meqserver: symbol lookup error: /usr/bin/meqserver: undefined symbol: _ZN9MeqPython11use_memprofE

[gijzelaerr]

what is the md5sum of your meqserver binary

$ md5sum /usr/bin/meqserver
2ad75347e907c4306576149c710b8c22  /usr/bin/meqserver

[jfunction]

It seems to be the same as yours:

md5sum /usr/bin/meqserver
2ad75347e907c4306576149c710b8c22  /usr/bin/meqserver

[gijzelaerr]

_ZN9MeqPython11use_memprofE should be defined in /usr/lib/libmeqserver.so. Do you have a libmeqserver.so in /usr/local? Or are you fiddeling with your LD_LIBRARY_PATH?

[jfunction]

Ah, so that symbol is not defined in my /usr/lib/libmeqserver.so. I guess then that this is the wrong hash:

md5sum /usr/lib/libmeqserver.so
4e9dbefc9c41cec361feb96f68959f32  /usr/lib/libmeqserver.so

I don't have any other files called libmeqserver.so lying around and I'm not sure how to check my LD_LIBRARY_PATH. It's not an live environment variable in my shell. I'm using zsh, I don't think that's the problem though because the issue persists if I switch to bash.

[gijzelaerr]

/usr/lib/libmeqserver.so should be in the libmeqtrees-timba0 package, which is currently at version 1.5.0.

[jfunction]

Installing the above package seems to fix the problem for me. Thanks Gijs!

[gijzelaerr]

how did that file get there? You should never install software manually in /usr except for /usr/local.

if you are using my packages and manually compile/install stuff make sure what you are doing because otherwise you are just wasting my time.

[jfunction]

I'm can't be sure what I had done. I think I did install casapy manually into an optsoft folder in my home directory.

My apologies if this issue was a result of a manual install.