[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

STINNER Victor added the comment: I looked at this old issue. First of all, "bug.py" filename is accurate: this program contains a bug, but it's non-obvious. * the main thread opens a file which gets the file descriptor 3 * a new thread is spawns which indirectly closes this file descriptor

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

Change by STINNER Victor : -- keywords: +patch pull_requests: +12713 stage: resolved -> patch review ___ Python tracker ___ ___

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

Zack Weinberg added the comment: I have observed this problem in a production application using Python 3.5 and 3.6 (system-packaged interpreters from Ubuntu) and I would like to mention that this is an effective workaround: ``` import ctypes libgcc_s = ctypes.CDLL("libgcc_s.so.1") ```

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

Barry Davis added the comment: I meant my cross compiled python, not my cross compiler. -- ___ Python tracker ___

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

Barry Davis added the comment: Looks like I was mistaken. My cross compiler was trying to load libgcc_s.so.1 from the standard location and not liking the one it found. Fixed for now by setting LD_LIBRARY_PATH to point at the dir containing the right libgcc_s.so.1 -- versions:

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

Barry Davis added the comment: I think this is the same issue I'm getting. I'm hitting it when compiling python 3.6.2 compiled with gcc-4.8.4. This wasn't occasional, it was every time I tried. As a feeble workaround I was compiling in parallel, then in serial when it fails, although I'm now

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

Changes by Barry Davis : -- versions: +Python 3.6 ___ Python tracker ___ ___

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

Changes by Nikolay Bryskin devel.n...@gmail.com: -- nosy: +nikicat ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue18748 ___ ___ Python-bugs-list

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

Charles-François Natali added the comment: On Linux, you can try to set the LD_PRELOAD environment variable as a workaround. LD_PRELOAD=libgcc_s.so.1 python bug.py You may need to specify the full path. I don't think that'll work. Despite its name, using LD_PRELOAD won't preload the

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

Maries Ionel Cristian added the comment: What is the version of your libc library? Try something like dpkg -l libc6. 2.15-0ubuntu10.4 I don't think it's that obscure ... uwsgi has this issue

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

Maries Ionel Cristian added the comment: Correct link https://www.google.com/search?q=libgcc_s.so.1+must+be+installed+for+pthread_cancel+to+work+uwsgi+site:lists.unbit.it -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue18748

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

STINNER Victor added the comment: 2013/8/17 Maries Ionel Cristian rep...@bugs.python.org: I don't think it's that obscure ... uwsgi has this issue https://www.google.com/search?q=libgcc_s.so.1+must+be+installed+for+pthread_cancel+to+work+uwsgi+site:lists.unbit.it- they cause it probably

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

Maries Ionel Cristian added the comment: Well anyway, is there any way to preload libgcc ? Because in python2.x it wasn't loaded at runtime. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue18748

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

STINNER Victor added the comment: 2013/8/18 Maries Ionel Cristian rep...@bugs.python.org: Well anyway, is there any way to preload libgcc ? Because in python2.x it wasn't loaded at runtime. On Linux, you can try to set the LD_PRELOAD environment variable as a workaround.

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

Maries Ionel Cristian added the comment: Alright ... would it be a very big hack to preload libgcc in the thread module (at import time) ? There is platform specific code there anyway, it wouldn't be such a big deal would it? -- ___ Python tracker

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

Charles-François Natali added the comment: Unfortunately, there's not much we can do about it: if dlsym() fails - which is the case here either because read() fails with EBADF, or because the file descriptor now points to another stream (i.e. not libgcc), the libc aborts (here upon

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

Antoine Pitrou added the comment: Perhaps the only thing we could do would be try to preload libgcc by calling one of those APIs at startup? But I'm not sure it's a good idea to add such a platform-specific hack (for what is arguably an obscure and rare issue). -- nosy: +pitrou

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

Changes by STINNER Victor victor.stin...@gmail.com: -- nosy: +haypo ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue18748 ___ ___ Python-bugs-list

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

STINNER Victor added the comment: Maries Ionel Cristian ubuntu 12.04.2 What is the version of your libc library? Try something like dpkg -l libc6. -- Could this issue be related to this glibc issue? http://sourceware.org/bugzilla/show_bug.cgi?id=2644 I ran your script on Python 3.4 in a

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

STINNER Victor added the comment: Oh ok, I'm able to reproduce the issue with the system Python 3.3: $ while true; do echo loop; python3.3 bug.py || break; done loop ... loop libgcc_s.so.1 must be installed for pthread_cancel to work Abandon (core dumped) --

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

Charles-François Natali added the comment: Perhaps the only thing we could do would be try to preload libgcc by calling one of those APIs at startup? Yeah, I was thinking about doing this in PyThread_init_thread() but... But I'm not sure it's a good idea to add such a platform-specific

[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

New submission from Maries Ionel Cristian: Running the file couple of times will make the interpreter fail with: libgcc_s.so.1 must be installed for pthread_cancel to work From what I've seen it is triggered from PyThread_delete_key (tries to load libgcc_s.so at that time). How does it