-02 optimization causes NoSuchProcess exception (FreeBSD)

[giampaolo]

From jlo...@gmail.com on February 25, 2009 15:59:47

What steps will reproduce the problem?  
1. Compile psutil with -O2 enabled
2. Run the test suite or psutil.py
3. NoSuchProcess exception thrown for *any* PID, caused by sysctl returning
ESRC for every PID passed to it. 

What is the expected output?  


What do you see instead?  
Process information should be printed as it is normally. Instead
NoSuchProcess is raised, caused by ESRCH error from sysctl regardless of PID

Original issue: http://code.google.com/p/psutil/issues/detail?id=25

[giampaolo]

From jlo...@gmail.com on February 25, 2009 07:26:50

It took me *hours* to figure this out last night because the test code worked 
fine until I compiled it with distutils. I finally caught on that the only thing
different about the code (after checking it line by line 100 times) was how it 
compiled. I took the compiler output line from the distutils build and tried 
a test C app with it, and got the same "No such process" error from sysctl 
removed -O2 optimization.

For now, I fixed this by removing the -O2 flag from my Python Makefile, but 
I'd like to either patch the C code, or setup.py to override -O2 so that this 
bite someone else building on FreeBSD. Potentially this code might also affect 
or other platforms where we're compiling from C source code, not sure without 
them individually.

[giampaolo]

From jlo...@gmail.com on February 25, 2009 08:38:15

Fixed in r169 - caused by a int -> siz_t cast. The same cast is used in the OS 
without appearing to cause any problems but that may be worth examining for 
problems at a later date.

Status: Verified

[giampaolo]

From billiej...@gmail.com on March 17, 2009 08:31:20

Status: Fixed

[giampaolo]

From g.rodola on March 02, 2013 03:44:36

Updated csets after the SVN -> Mercurial migration: r169 == revision