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From: Nikolaus Rath <Nikolaus@rath.org>
To: python-list@python.org
Subject: Missing stack frames?
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Date: Tue, 03 Jun 2014 19:30:16 -0700
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Xref: csiph.com comp.lang.python:72579

Hello,

(This may or may not be related to my mail about a "corrupted stack
trace").

I've instrumented one of my unit tests with a conditional
'pdb.set_trace' in some circumstances (specifically, when a function is
called by a thread other than MainThread). However, when trying to print
a back trace to figure out how this function got called, I get this:

$ py.test-3 tests/t1_backends.py -k extra
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D test session starts =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
platform linux -- Python 3.3.5 -- py-1.4.20 -- pytest-2.5.2 -- /usr/bin/pyt=
hon3
collected 33 items=20

tests/t1_backends.py:563: test_extra_data[mock_s3c-plain] SKIPPED
tests/t1_backends.py:563: test_extra_data[mock_s3c-zlib] PASSED

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 31=
 tests deselected by '-kextra' =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 1 passed, 1 skipped, 31 desel=
ected in 0.23 seconds =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> /home/nikratio/in-progress/s3ql/src/s3ql/backends/s3c.py(693)close()
-> if not self.md5_checked:
(Pdb) bt
  /home/nikratio/in-progress/s3ql/src/s3ql/backends/common.py(853)close()
-> self.fh.close()
> /home/nikratio/in-progress/s3ql/src/s3ql/backends/s3c.py(693)close()
-> if not self.md5_checked:
(Pdb) q

What does this mean? Why is there no caller above the backends/common.py co=
de? At
the very least, I would have expected some frames from threading.py...?


Best,
-Nikolaus
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             =C2=BBTime flies like an arrow, fruit flies like a Banana.=C2=
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