Bug 426194 – app-eselect/eselect-python: python wrapper breaks OpenELEC build

• Product: Gentoo Linux
• Status: RESOLVED OBSOLETE

[Description Georgi Georgiev 2012-07-11 19:38:20 UTC]

I am building OpenELEC from https://github.com/OpenELEC/ and Gentoo's python is causing the build process to fail. The short story is that OpenELEC bootstarts the whole build process and it builds most packages with LD_LIBRARY_PATH set to a directory where it bootstrapped the packages/libraries (in my case it is LD_LIBRARY_PATH=$HOME/OpenELEC.tv/2.0/build.OpenELEC-Generic.x86_64-1.95.5/toolchain/lib). When it gets to building "cmake", the cmake build process tries to run bzr, which is a Gentoo python-wrapped script. However, since there is a libpython2.7.so in the LD_LIBRARY_PATH which is *not* Gentoo-patched, the wrapper goes in an endless loop trying execute itself over and over again.

Here is what seems to be happening:

> env strace -e trace=process env LD_LIBRARY_PATH=~/OpenELEC.tv/2.0/build.OpenELEC-Generic.x86_64-1.95.5/toolchain/lib /usr/bin/bzr
execve("/usr/bin/env", ["env", "LD_LIBRARY_PATH=/home/chutz/Open"..., "/usr/bin/bzr"], [/* 71 vars */]) = 0
arch_prctl(ARCH_SET_FS, 0x7fbdfaaba700) = 0
execve("/usr/bin/bzr", ["/usr/bin/bzr"], [/* 72 vars */]) = 0
arch_prctl(ARCH_SET_FS, 0x7f11ef379700) = 0
execve("/usr/local/bin/python", ["python", "/usr/bin/bzr"], [/* 72 vars */]) = -1 ENOENT (No such file or directory)
execve("/usr/bin/python", ["python", "/usr/bin/bzr"], [/* 72 vars */]) = 0
arch_prctl(ARCH_SET_FS, 0x7f49dcb46700) = 0
execve("/usr/bin/python2.7", ["/usr/bin/python2.7", "/usr/bin/bzr"], [/* 73 vars */]) = 0
arch_prctl(ARCH_SET_FS, 0x7f5d00541700) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f5d005419d0) = 30722
wait4(30722, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 30722
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=30722, si_status=0, si_utime=1, si_stime=0} ---
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f5d005419d0) = 30731
wait4(30731, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 30731
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=30731, si_status=0, si_utime=0, si_stime=0} ---
execve("/usr/bin/python2.7", ["/usr/bin/python2.7", "/usr/bin/bzr"], [/* 75 vars */]) = 0
arch_prctl(ARCH_SET_FS, 0x7f95b0de7700) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f95b0de79d0) = 30732
wait4(30732, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 30732
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=30732, si_status=0, si_utime=1, si_stime=0} ---
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f95b0de79d0) = 30741
wait4(30741, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 30741
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=30741, si_status=0, si_utime=0, si_stime=0} ---
execve("/usr/bin/python2.7", ["/usr/bin/python2.7", "/usr/bin/bzr"], [/* 75 vars */]) = 0
arch_prctl(ARCH_SET_FS, 0x7fdab4f14700) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fdab4f149d0) = 30742
wait4(30742, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 30742
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=30742, si_status=0, si_utime=0, si_stime=1} ---
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fdab4f149d0) = 30751
wait4(30751, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 30751
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=30751, si_status=0, si_utime=0, si_stime=0} ---
execve("/usr/bin/python2.7", ["/usr/bin/python2.7", "/usr/bin/bzr"], [/* 75 vars */]) = 0
arch_prctl(ARCH_SET_FS, 0x7f3520edf700) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f3520edf9d0) = 30752
wait4(30752, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 30752
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=30752, si_status=0, si_utime=1, si_stime=0} ---
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f3520edf9d0) = 30761
wait4(30761, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 30761


Reproducible: Always

Steps to Reproduce:
1. git clone git://github.com/OpenELEC/OpenELEC.tv.git
2. cd OpenELEC.tv
3. git reset --hard 1.95.5
4. make ARCH=x86_64
Actual Results:  
When it got around to building cmake the process stopped. Check the process list revealed that "bzr" is taking almost all of the cpu. Tracing the process showed that is running itself over and over again.

Expected Results:  
The build completes.

I reported this to OpenELEC as well but since the python wrapper seems to be causing quite a few problems, I thought it is relevant to report it here as well.

[Comment 1 Arfrever Frehtes Taifersar Arahesis 2012-07-11 20:14:18 UTC]

Gentoo is patching both python2.7 executable and libpython2.7.so.1.0 library used by this executable. Mixing of patched executable with unpatched library is unsupported.

[Comment 2 Michał Górny 2016-02-28 17:21:27 UTC]

This should no longer be a case since eselect-python-2015*+ / python-exec-2.2+ no longer use the original python-wrapper and no longer rely on patched Python.