Missing stack frames?

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From	Nikolaus Rath <Nikolaus@rath.org>
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Subject	Missing stack frames?
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Date	Tue, 03 Jun 2014 19:30:16 -0700
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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
=============================== test session starts ===============================
platform linux -- Python 3.3.5 -- py-1.4.20 -- pytest-2.5.2 -- /usr/bin/python3
collected 33 items 

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

======================== 31 tests deselected by '-kextra' =========================
=============== 1 passed, 1 skipped, 31 deselected in 0.23 seconds ================
> /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 code? At
the very least, I would have expected some frames from threading.py...?


Best,
-Nikolaus
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Missing stack frames? Nikolaus Rath <Nikolaus@rath.org> - 2014-06-03 19:30 -0700

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