Python subprocess returned -11

Question

I'm making a test case, and whenever I call subprocess, I get the following error.

 File "/usr/lib/python2.7/subprocess.py", line 540, in check_call
 raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/usr/bin/python', 'TestRunner/TestRunner.py', '-r', '1000000']' returned non-zero exit status -11

The thing is, how I'm suppose to extract the actual error message?

I do not get anything from exit status -11.

Are there any temp file which stores the error details?

Thanks.

• McGlothlin: Have you seen this? stackoverflow.com/questions/3630389/python-error-codes
• Yu Zhang: Did you mean exit status -1?
• Toshihiro M Sakurai: Its exit status -11 not -1
• ShadowRanger: The error details (if any) are specific to the process that was run. If the process produced stderr output, you can look at that (if you're running without a terminal, you can open a file and pass stdout=fileobj and/or stderr=fileobj to send the output the process produced to a file to check (or use Popen instead of check_call with stdout=subprocess.PIPE and stderr=subprocess.PIPE and you can call .communicate() on the Popen object to read it into your Python process). Aside from that, process exit codes are not standardized; it's up to the program run what each code means.
• ShadowRanger: Or ignore me and look at what @McGlothlin linked; forgot about the "negative status means killed by signal" rule.

Answer 1

To elaborate on my comment:

Based on the link I provided, it looks like you're running into a segfault because a thread did something it wasn't supposed to. Perhaps it would be helpful to check out this link as well: https://wiki.python.org/moin/CrashingPython

You can also try the highest voted answer in this question. I have little experience debugging segfaults in Python specifically, but that's where I'd start looking.

• Toshihiro M Sakurai: I'll take your answer for now! Thanks.

Answer 2

Try running the command manually:

/usr/bin/python TestRunner/TestRunner.py -r 1000000

If the -11 return is interpreted as "exited with signal 11 (Seg fault)", the shell should print a message saying such.