trying to make tracebacks reproducible

[Christian Ebert]

* Christian Ebert on Sunday, July 04, 2010 at 01:03:50 +0200
> * Christian Ebert on Friday, July 02, 2010 at 02:12:44 +0200
>> * Martin Geisler on Thursday, July 01, 2010 at 23:33:24 +0200
>>> Christian Ebert <blacktrash at gmx.net> writes:
>>>> Since a few days -- sorry for being vague, but this is actually
>>>> part of the problem, I _sometimes_ get tracebacks with
>>>> crew-stable (basically 1.6 I'd say). I cannot reproduce them
>>>> "reliably", i.e. in the following example, I reissued the command
>>>> and got the diff as expected. I can reduce the loaded extensions
>>>> etc. but I'd like to reproduce this reliably first. It seems to
>>>> happen at random - well, in the true sense of the word, if you
>>>> look at the final lines of the traceback.
>>> 
>>> Heh, nice one :-)
>>> 
>>>> I'd be grateful for any ideas.
>>> 
>>>>  mod = _origimport(name, globals, locals)
>>>> File "/sw/lib/python2.6/random.py", line 59, in <module>
>>>>  LOG4 = _log(4.0)
>>>> ValueError: math domain error
>>> 
>>> Can you make it fail if you do something like
>>> 
>>> while python -c 'import random; print random.LOG4'; do done
>> 
>> That's evil!
>> 
>> Yes, I can/could. After rebooting the problem has gone away.
>> Probably I overtortured my machine with multithreaded video
>> conversion. Well, let's hope this is not a sign of senility - of
>> the machine I mean.
> 
> And now for the strangest thing: it does NOT happen with
> Mercurial 1.5! But reliably with 1.6. Will bisect.

And the winner is:

changeset:   11182:3c368a1c962d
branch:      stable
parent:      11171:3b3261f6d9ba
user:        Brodie Rao <brodie at bitheap.org>
date:        Mon May 03 14:00:34 2010 -0500
summary:     pager: fork and exec pager as parent process

Conditions:

[extensions]
pager=
[pager]
less -FX

and running a cpu intensive video conversion. Then, with every
second or third call -- obviously one that involves the pager --
I get the traceback ...

c
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