Comment 7 for bug 1347322

With sinzui's help I have compiled the latest version of Juju 1.20.2 with the gccgo-4.9_4.9.1-1ubuntu3_ppc64el.deb.

NOT able to reproduce the “juju ssh” panic/problem having several ssh sessions open simultaneously and having output streaming for over 2 hours.

For clarity and review here are the details of how we build the deb packages for Juju with the gccgo 4.9.1 compiler on the CI machine stilson-09 (a P8 64k page size machine).

ubuntu@stilson-09:~⟫ uname -a
Linux stilson-09 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:29:18 UTC 2014 ppc64le ppc64le ppc64le GNU/Linux
ubuntu@stilson-09:~⟫ getconf PAGE_SIZE
65536
ubuntu@stilson-09:~⟫ more /proc/cpuinfo
processor : 0
cpu : POWER8E (raw), altivec supported
clock : 4116.000000MHz
revision : 2.0 (pvr 004b 0200)

processor : 1
cpu : POWER8E (raw), altivec supported
clock : 4116.000000MHz
revision : 2.0 (pvr 004b 0200)

timebase : 512000000
platform : pSeries
model : IBM pSeries (emulated by qemu)
machine : CHRP IBM pSeries (emulated by qemu)

Downloaded the following packages from: https://launchpad.net/ubuntu/utopic/ppc64el/gccgo-4.9/4.9.1-1ubuntu3

binutils_2.24.51.20140709-1ubuntu1_ppc64el.deb
cpp-4.9_4.9.1-1ubuntu3_ppc64el.deb
gcc-4.9_4.9.1-1ubuntu3_ppc64el.deb
gcc-4.9-base_4.9.1-1ubuntu3_ppc64el.deb
gccgo-4.9_4.9.1-1ubuntu3_ppc64el.deb
libatomic1_4.9.1-1ubuntu3_ppc64el.deb
libgcc1_4.9.1-1ubuntu3_ppc64el.deb
libgcc-4.9-dev_4.9.1-1ubuntu3_ppc64el.deb
libgo5_4.9.1-1ubuntu3_ppc64el.deb
libgomp1_4.9.1-1ubuntu3_ppc64el.deb
libitm1_4.9.1-1ubuntu3_ppc64el.deb

Installed the packages on stilson-09:

ubuntu@stilson-09:~/gccgo⟫ sudo dpkg -i *.deb

ubuntu@stilson-09:~/gccgo⟫ dpkg -l | grep gcc
ii gcc 4:4.8.2-1ubuntu6 ppc64el GNU C compiler
ii gcc-4.8 4.8.3-3ubuntu0.2 ppc64el GNU C compiler
ii gcc-4.8-base:ppc64el 4.8.3-3ubuntu0.2 ppc64el GCC, the GNU Compiler Collection (base package)
ii gcc-4.9 4.9.1-1ubuntu3 ppc64el GNU C compiler
ii gcc-4.9-base:ppc64el 4.9.1-1ubuntu3 ppc64el GCC, the GNU Compiler Collection (base package)
ii gccgo 4:4.9-1ubuntu6 ppc64el Go compiler, based on the GCC backend
ii gccgo-4.9 4.9.1-1ubuntu3 ppc64el GNU Go compiler
ii gccgo-go 1.2.1-0ubuntu1 ppc64el Go tool for use with gccgo
ii libgcc-4.8-dev:ppc64el 4.8.3-3ubuntu0.2 ppc64el GCC support library (development files)
ii libgcc-4.9-dev:ppc64el 4.9.1-1ubuntu3 ppc64el GCC support library (development files)
ii libgcc1:ppc64el 1:4.9.1-1ubuntu3 ppc64el GCC support library

Built Juju from source on stilson-09:

<sinzui> ~/Work/juju-release-tools/make-source-packages.bash stable juju-core_1.20.2.tar.gz 'Curtis Hovey <email address hidden>' 1340893 1345014 1344940 1345832 1307434 1347371 1337091 1342747 1343301 1341589
<sinzui> ~/Work/juju-release-tools/build-package-with-dsc.bash ubuntu@stilson-09 '' /home/curtis/Downloads/tmp.WUZeXOfFz1/juju-core_1.20.2-0ubuntu1~14.04.1~juju1.dsc

Resulting in:

ubuntu@stilson-09:~⟫ ls -l juju-build
total 17332
-rw-r--r-- 1 ubuntu ubuntu 6944 Jul 25 15:05 juju_1.20.2-0ubuntu1~14.04.1~juju1_all.deb
drwxrwxr-x 7 ubuntu ubuntu 4096 Jul 25 15:04 juju-core-1.20.2
-rw------- 1 ubuntu ubuntu 8356 Jul 25 15:04 juju-core_1.20.2-0ubuntu1~14.04.1~juju1.debian.tar.gz
-rw------- 1 ubuntu ubuntu 1183 Jul 25 15:04 juju-core_1.20.2-0ubuntu1~14.04.1~juju1.dsc
-rw-rw-r-- 1 ubuntu ubuntu 3133 Jul 25 15:05 juju-core_1.20.2-0ubuntu1~14.04.1~juju1_ppc64el.changes
-rw-r--r-- 1 ubuntu ubuntu 14341816 Jul 25 15:05 juju-core_1.20.2-0ubuntu1~14.04.1~juju1_ppc64el.deb
-rw-rw-r-- 1 ubuntu ubuntu 3354392 Jul 25 15:03 juju-core_1.20.2.orig.tar.gz
-rw-r--r-- 1 ubuntu ubuntu 7020 Jul 25 15:05 juju-local_1.20.2-0ubuntu1~14.04.1~juju1_all.deb
-rw-r--r-- 1 ubuntu ubuntu 7022 Jul 25 15:05 juju-local-kvm_1.20.2-0ubuntu1~14.04.1~juju1_all.deb

I copied these deb packages to stilson-01:
ubuntu@stilson-01:~$ ls -l juju-build
total 14032
-rw-r--r-- 1 ubuntu ubuntu 6944 Jul 25 15:21 juju_1.20.2-0ubuntu1~14.04.1~juju1_all.deb
-rw-r--r-- 1 ubuntu ubuntu 14341816 Jul 25 15:22 juju-core_1.20.2-0ubuntu1~14.04.1~juju1_ppc64el.deb
-rw-r--r-- 1 ubuntu ubuntu 7020 Jul 25 15:22 juju-local_1.20.2-0ubuntu1~14.04.1~juju1_all.deb
-rw-r--r-- 1 ubuntu ubuntu 7022 Jul 25 15:22 juju-local-kvm_1.20.2-0ubuntu1~14.04.1~juju1_all.deb

Installed the deb packages on stilson-01:

sudo dpkg -i *.deb

ubuntu@stilson-01:~$ dpkg -l | grep juju
ii juju 1.20.2-0ubuntu1~14.04.1~juju1 all next generation service orchestration system
ii juju-core 1.20.2-0ubuntu1~14.04.1~juju1 ppc64el Juju is devops distilled - client
ii juju-deployer 0.3.6-0ubuntu2 all Deploy complex stacks of services using Juju
ii juju-jitsu 0.20-1 all external tools to enhance juju
ii juju-local 1.20.2-0ubuntu1~14.04.1~juju1 all dependency package for the Juju local provider
ii juju-local-kvm 1.20.2-0ubuntu1~14.04.1~juju1 all dependency package for the Juju local provider
ii juju-mongodb 2.4.9-0ubuntu3 ppc64el MongoDB object/document-oriented database for Juju
ii juju-quickstart 1.4.1+bzr88+ppa25~ubuntu14.04.1 all Easy configuration of Juju environments
ii python-jujuclient 0.17.5-0ubuntu2 all Python API client for juju

Examined the strings in juju and jujud:

ubuntu@stilson-01:~$ strings $(which juju) | grep gcc
__gccgo_personality_v0
libgcc_s.so.1
-gccgoflags=-static-libgo
gccgo
ubuntu@stilson-01:~$ strings $(which jujud) | grep gcc
libgcc_s.so.1
gccgo
-gccgoflags=-static-libgo
gccgo
xgcc (Ubuntu 4.9.1-1ubuntu3) 4.9.1

Doing some testing on power that involves running the “juju test” command which bootstraps an environment deploys waits for success/fail and then destroys the environment. The test run will attempt to run 141 times and is on 9 iterations without a juju failure. I am confident this gccgo fix is good.