[Ipopt] unusual crash in scaling

[Jonathan Hogg]

Not really an expert on Ipopt in particular, but behavior sounds
suspiciously like a memory corruption or uninitialized variable issue.

Assuming you can't find the problem with others' advice from the stack
trace, try some form of memory checker if you haven't already. If you're
on linux look at address sanitizer (fast, requires gcc/llvm based
compilation with special flags) or valgrind (slow, works with any
executable).

Jonathan.

On 18/06/15 16:15, Damien wrote:
> Hi,
> 
> I've had an intermittent crash that only happens in release builds
> (yay...) for the last couple of months.  I just managed to catch it in
> the debugger.  I'm posting this looking for guidance because I don't
> want to lose my stack trace.  Sorry this is a little specific.
> 
> In GradientScaling::DetermineScalingParametersImpl, there's eventually a
> call that ends up in GenTMatrix::ComputeRowAMaxImpl. The crash is
> because irows[0] = 67108865 (irows[1] = 67108865 as well) and it's off
> the end of the vec_vals array pointer.  There's about 5.2 million
> nonzeroes in the Jacobian, so an index of 67 million is a tad high.  The
> rest of the irows array looks right (1, 1, 2, 2, 3, 3, etc).
> 
> This is really hard to reproduce and is intermittent.  Can any of the
> experts in the code point me to where to look?
> 
> Damien
> _______________________________________________
> Ipopt mailing list
> Ipopt at list.coin-or.org
> http://list.coin-or.org/mailman/listinfo/ipopt