Re: [matplotlib-devel] debugging python code

[Perry G. <pe...@st...>]

On Dec 5, 2004, at 9:10 PM, Andrew Straw wrote:

>
> On Dec 5, 2004, at 9:04 AM, Jochen Voss wrote:
>
>> Hello everybody,
>>
>> On Wed, Dec 01, 2004 at 06:38:47PM -0800, Andrew Straw wrote:
>>> It sounds like you may have hit a nasty glibc bug that caused me much
>>> head scratching over the months.  Check this thread:
>>>
>>> http://aspn.activestate.com/ASPN/Mail/Message/numpy-discussion/ 
>>> 2207861
>>>
>>> Bottom line:
>>>
>>> numarray does The Right Thing and attempts to set up floating point
>>> exception handling, but older versions of glibc (such as that in  
>>> Debian
>>> sarge) have a bug whereby the floating point error bits in the SSE  
>>> are
>>> not  properly cleared, leading to a SIGFPE terminating the program  
>>> the
>>> next time the SSE unit is used.
>> Yes, this was the problem.  I applied the patch from
>>
>
I really appreciate Andrew's diagnosing the original problem and  
particularly in recognizing it as possibility here. This is a nasty  
kind of bug to figure out.

>> By the way: I am still interested in my original question.  How would
>> I use a debugger etc. to find the problem myself in such a situation?
>
> If you find out, let me know!  Seriously, having a process killed by  
> the kernel

Us too!

Perry