ida examples segfault on OSX

[acroy]

Running the examples ida_Roberts_dns.jl or ida_Roberts_simplified.jl leads to a segmentation fault on my machine. Not sure if this is connected to #13? cc: @tkelman

[tkelman]

Seems to work fine for me on Win32, Win64, RHEL64. Was this on a Mac? Clang problem?

[acroy]

Yep, this is on my Mac.

[tkelman]

What version of OS X? Do the C examples work? I wouldn't be surprised if there's something in Sundials that Clang doesn't like, so this might be motivation to go the Homebrew binary route on Mac. There we should be able to specify we want gcc, if that turns out to be necessary.

[acroy]

I am on OSX 10.8.5. Can I build the examples separately? I can also try to build the library using gcc ...

[acroy]

I built the library and examples using MacPorts gcc (4.8.2) and it is still the same. The C example (idaRoberts_dns) works, but the Julia example segfaults ...

[tkelman]

Can you track it down to which ccall causes trouble? I'm at a bit of a loss then, not sure what else would be different on Mac.

[acroy]

Seems to crash in

retval = Sundials.IDASolve(mem, tout, tret, yy, yp, Sundials.IDA_NORMAL)

but that could also be due to something going wrong in the initialization. It is also strange that this affects only IDA?

[tkelman]

I meant inside Sundials.IDASolve, can you try to execute one line at a time to see where the problem occurs? Presumably it's in a ccall. I imagine IDA requires more inputs, has a more complicated API so the problem is in some code path that's specific to IDA rather than used by all of the solvers.

[acroy]

Sundials.IDASolve is effectively a ccall (see Sundials.jl#L79-L80 and ida.jl#82).

[tkelman]

Oh, hah, my bad. Can you try to replicate the input data in C? If that doesn't work, maybe build a debug version of the IDA lib and run Julia through gdb/lldb? I think I made a debug version by running make CFLAGS=-g, couldn't find a better way through a configure flag.

[acroy]

I didn't have time to check the debug version. Just wanted to say that my colleague tried it on his Mac and it also fails for him ... So it seems to be Mac specific (I have changed the title of the issue).

[tkelman]

Was he also on 10.8?

[acroy]

I think he is on 10.7 but I will have to check that.

[kelvich]

Just came across the same trouble with today's julia-HEAD installation. Downgrading to 0.2.1 fixed that.