launchpad-dev team mailing list archive

[Michael Hudson <michael.hudson@xxxxxxxxxxxxx>]

On 28/04/10 01:10, Max Bowsher wrote:
> On 27/04/10 13:44, Gavin Panella wrote:
> > I have a hung test process on my local machine.
> >
> > Command: bin/test -vvct 'check-?watch|bug-?watch|bug-?track'
> > Michael Hudson Trace: http://pastebin.ubuntu.com/423333/

"Michael Hudson Trace", heh heh.

> Judging by the presence of spawn_layer_in_subprocess and the general
> appearance of the stacks to be that of waiting on stdio, I'd suggest
> that this process is just waiting for communications from the subprocess?
>
> > GDB Trace: http://pastebin.ubuntu.com/423334/
>
> Only for the main thread - remember to do 'thread apply all backtrace'
> (or 'thr a a bt').
>
> > In gdb, pystack and pystackv never completed (they hung too).
>
> I've never got these to work, either. I'd be interested to know if they
> ever work.

They work with a debug build of 2.5 or a release build of 2.4, but they 
won't work with a release build of 2.5[1].  This is why I wrote the 
backtrace.py tool!

Cheers,
mwh


[1] IIRC too much code gets inlined for the macros to find a particular
    function by address comparisons of other functions.  Or something
    like that.