py.test hangs after update from 2.5 to 2.6.2

[pytestbot]

Originally reported by: Thomas Güttler (BitBucket: thomas-guettler, GitHub: thomas-guettler)

---

After updating from 2.5.2 to 2.6.2 py.test hangs in os.system().

The very strange thing: If I use the "-s" option for py.test, the tests passes and does not hang.

Before I waste hours if debugging I want to ask here if you have seen something like this before.

---

• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/592

[pytestbot]

Original comment by Thomas Güttler (BitBucket: thomas-guettler, GitHub: thomas-guettler):

---

We found a work around: we change

#!python

os.system(cmd)

to

#!python

subprocess.call(cmd, shell=True)

and it works.

But it would be nice to find the root of the problem.

[pytestbot]

Original comment by Jurko Gospodnetić (BitBucket: jurko, GitHub: jurko):

---

Any minimalistic use-case reproducing the problem?

Best regards,
Jurko Gospodnetić

[pytestbot]

Original comment by Thomas Güttler (BitBucket: thomas-guettler, GitHub: thomas-guettler):

---

I am sorry, I can't get find a minimal use-case.

I can't reveal the test data. The command is something like this:

#!python

os.system('''anytopnm  somefile.png | pnmtops -width 8.27 -height 11.7 2>/dev/null > 'output.ps' ''')

But its reproduceable for me. Switching to subprocess.call(cmd, shell=True), downgradding to py.test 2.5 or using "-s" solves the problem.

[RonnyPfannschmidt]

Closing as result of using a bad api subprocess should be used in all cases