please support systemtap traces in openjdk

[i30817]

[SRU justification]

[Impact]

I'd like, not only to trace the java process, but use the new support for openjdk tracing in systemtap, both the hotspot tracing and the method tracing.

Accordingly i installed the ddebs.ubuntu.com[1] repository to install the kernel debuging symbols - i can then call a stap script that uses kernel tapsets but not yet java ones. I did notice a package called openjdk-7-jdk-dbgsym and tried to install it to see if this had the systemtap tapsets for the openjdk, but this conflicts with the openjdk-7-dbg package (which then ubuntu doesn't let me bug report since the openjdk-7-jdk-dbgsym package is not from the 'official' servers). And if i uninstall that one and install the other it doesn't help anyway.

If the steps i followed to try to get systemtap java method tracing in ubuntu were incorrect and this can be done with packages from your reporsitories, feel free to close.

[1] https://sourceware.org/systemtap/wiki/SystemtapOnUbuntu

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: openjdk-7-dbg (not installed)
ProcVersionSignature: Ubuntu 3.13.0-14.34-generic 3.13.5
Uname: Linux 3.13.0-14-generic x86_64
ApportVersion: 2.13.2-0ubuntu5
Architecture: amd64
CurrentDesktop: GNOME
Date: Sun Mar 2 20:37:05 2014
InstallationDate: Installed on 2014-01-17 (44 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140117)
SourcePackage: openjdk-7
UpgradeStatus: No upgrade log present (probably fresh install)

[Test Case]

sudo apt-get install openjdk-7-dbg binutils

readelf -n /usr/lib/debug/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/server/libjvm.so

no systemtap symbol in it

[Regression Potential]

[Other Info]

[Matthias Klose (doko)]

I would like to avoid adding this new feature for the openjdk-7 builds for released Ubuntu versions. I don't know the impact, and I honestly don't have the time to investigate the impacts.

I'll enable that for the openjdk-7 package in 14.10 (utopic) has this enabled, so would it be possible to test on this release?

I any way, the patch is wrong, and is overwritten when you build the package. You need to define with_systemtap in the debian/rules file, regenerate the control file and then build the package.

[Iain Lane (laney)]

Unsubscribing sponsors since doko will handle for U, please re-subscribe if you wish to have some stable update diffs sponsored.

[Launchpad Janitor (janitor)]

[Expired for openjdk-7 (Ubuntu) because there has been no activity for 60 days.]