Re: [Chicken-users] crashes during return-from-callbacks

[Daniel B. Faken]

On Wed, 7 Sep 2005, felix winkelmann wrote:
> On 9/7/05, Daniel B. Faken <address@hidden> wrote:
> 
> >   It is *not* reaching the callback-return-continuation (I inserted a
> > printf in there).
> >   Also, if I compile the code [and eval (load "foo.so") instead of
> > (load "foo.scm")], I have no problems..
> > 
> > On Wed, 7 Sep 2005, Daniel B. Faken wrote:
> > [snip]
> > >   Its been very hard to track down what is causing this; all I can say is
> > > that it is affected by calls to (print) in the called-back scheme
> > > function.  Specifically, if I print some of the parameters I'm passing via
> > > C_callback().
> > 
> > A clarification: it crashes if I print parameters *multiple times*.
> > If I remove some of the print statements, there is no problem.
> > 
> 
> Do you have nested callbacks? 

I call from C->Scheme->C, but thats it.
(I'm using Scheme to filter the C commands -- and the only filtering I'm 
actually doing here is to print them to stdout (see below))

> Also try (set-gc-report! ...), it is possible that the more code executes
> (consumes stack-space), the earlier the problem appears.

What should I look for?

Here is the output for my program from shortly before it terminates:

MatrixMode[GL_PROJECTION]
GC: level  0    gcs(minor)  84  gcs(major)  1
GC: stack       fefb1ae8        fefc1870        fefd1ae8              30
GC:  from       f60b1008        f6125b74        f612b128
GC:    to       f612d008        f612d008        f61a7128
LoadIdentity ==========>....... args=()
(IN super-spu-dispatch: spu= #<pointer 911aa70>   () 0)
..and super-spu = #<pointer 911aa70>
LoadIdentity[]
GC: level  0    gcs(minor)  85  gcs(major)  1
GC: stack       fefb1ae8        fefc4634        fefd1ae8              30
GC:  from       f60b1008        f6125ba4        f612b128
GC:    to       f612d008        f612d008        f61a7128
Frustum ==========>....... args=(-1.0 1.0 -1.0 1.0 5.0 60.0)
(IN super-spu-dispatch: spu= #<pointer 911aa70>   (-1.0 1.0 -1.0 1.0 5.0 
60.0) 6)
..and super-spu = #<pointer 911aa70>
Frustum[-1.0, 1.0, -1.0, 1.0, 5.0, 60.0]
GC: level  0    gcs(minor)  86  gcs(major)  1
GC: stack       fefb1ae8        fefb1a5c        fefd1ae8             404
GC:  from       f60b1008        f6125fa8        f612b128
GC:    to       f612d008        f612d008        f61a7128

CR Error(dhcp4-51:21510): "/usr/X11R6/bin/glxgears" terminated with 
uncaught signal=11 (SIGSEGV)



- Daniel