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Bug 1629978 - Python can sometimes create incorrect .pyc files
Summary: Python can sometimes create incorrect .pyc files
Keywords:
Status: CLOSED DUPLICATE of bug 1629982
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: python
Version: 7.5
Hardware: All
OS: Linux
medium
medium
Target Milestone: beta
: 7.7
Assignee: Python Maintainers
QA Contact: BaseOS QE - Apps
URL:
Whiteboard:
Depends On:
Blocks: 1629982
TreeView+ depends on / blocked
 
Reported: 2018-09-17 17:43 UTC by Paulo Andrade
Modified: 2018-10-29 12:50 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 1629982 (view as bug list)
Environment:
Last Closed: 2018-10-22 09:19:06 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Python 25083 0 None None None 2018-09-17 17:45:18 UTC

Description Paulo Andrade 2018-09-17 17:43:24 UTC 
User is affected by the bug described at https://bugs.python.org/issue25083
that causes the generation of empty .pyc files.

  With patch at https://github.com/python/cpython/commit/f64c813de84011a84ca21d75a294861a9cc2dfdc
Comment 2 Charalampos Stratakis 2018-09-17 17:50:47 UTC 
If I recall correctly we didn't backport this patch to RHEL7 due to concerns with backwards compatibility. Petr could you confirm that?
Comment 3 Petr Viktorin (pviktori) 2018-09-18 09:10:04 UTC 
Charris: no, this is a different issue than what you're thinking about. This one is not invasive.

The change adds error checking for the case when source for a Python module cannot be read (for example, on an unreliable networked filesystem).
Previously, this did not raise an error, but resulted in an empty bytecode cache file. The module can not be imported until the cache file is manually removed.
With the change, such compilation fails with an exception. This allows the user to detect the issue as it happens.


Note that while I'm sure the upstream patch is an improvement, I haven't checked if it addresses all instances of the issue. How important is this to the customer?
Also, testing this will be rather involved. As noted in the upstream issue, reliably reproducing the issue "involves LD_PRELOADing an dynamic library which hooks __srget".
Comment 4 Petr Viktorin (pviktori) 2018-09-20 12:51:40 UTC 
I set the wrong needinfo. Paulo, can you answer the following?

> Note that while I'm sure the upstream patch is an improvement, I haven't checked if it addresses all instances of the issue. How important is this to the customer?


Also, it is probably too late now to backport this to RHEL 6 (Python 2.6).
Comment 10 Petr Viktorin (pviktori) 2018-10-22 09:19:06 UTC 
Bug #1629982 tracks this for RHEL 7.

*** This bug has been marked as a duplicate of bug 1629982 ***
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