R devel - Feb 2013 - GC encountered a node (…) with an unknown SEXP type

Dear All,

I'm trying to track down a very erratic bug in some fortran;  I have an
example that
quite consistently segfaults on windoz, and more sporadically on mac, all in the
course of doing some bootstrap calculations, varying the set.seed call,  but
I'm now
trying to see what is going on on our  redhat system:

R version 2.15.1 (2012-06-22) -- "Roasted Marshmallows"
Copyright (C) 2012 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
Platform: x86_64-unknown-linux-gnu (64-bit)

I now have an example, i.e. a seed, that produces the error:

Error in crq.fit.por(xb, yb, cb, weights = w, ctype = ctype, ...) : 
  GC encountered a node (0xb488bc0) with an unknown SEXP type: SPECIALSXP at
memory.c:927

I've tried capturing the data for this call and running it from the terminal
window, but annoyingly it fails to complain when I do that.  I thought someone
might have a better idea.  My experience with gdb is very limited, I tried
running
R -d gdb  
which reproduces the error, but this gets me back to the R prompt and I
can't
see any more than what was available without gdb.  Any advice would be most
welcome.

Roger



url:    www.econ.uiuc.edu/~roger            Roger Koenker
email    rkoenker at uiuc.edu            Department of Economics
vox:     217-333-4558                University of Illinois
fax:       217-244-6678                Urbana, IL 61801

Roger,

please try tracking it with valgrind - that will typically trigger at the cause
whereas what you see is just the fall-out much later when the memory got already
corrupted.

Cheers,
Simon


On Feb 20, 2013, at 6:20 PM, Roger Koenker wrote:
> Dear All,
> 
> I'm trying to track down a very erratic bug in some fortran;  I have an
example that
> quite consistently segfaults on windoz, and more sporadically on mac, all
in the
> course of doing some bootstrap calculations, varying the set.seed call, 
but I'm now
> trying to see what is going on on our  redhat system:
> 
> R version 2.15.1 (2012-06-22) -- "Roasted Marshmallows"
> Copyright (C) 2012 The R Foundation for Statistical Computing
> ISBN 3-900051-07-0
> Platform: x86_64-unknown-linux-gnu (64-bit)
> 
> I now have an example, i.e. a seed, that produces the error:
> 
> Error in crq.fit.por(xb, yb, cb, weights = w, ctype = ctype, ...) : 
>  GC encountered a node (0xb488bc0) with an unknown SEXP type: SPECIALSXP at
memory.c:927
> 
> I've tried capturing the data for this call and running it from the
terminal
> window, but annoyingly it fails to complain when I do that.  I thought
someone
> might have a better idea.  My experience with gdb is very limited, I tried
running
> R -d gdb  
> which reproduces the error, but this gets me back to the R prompt and I
can't
> see any more than what was available without gdb.  Any advice would be most
> welcome.
> 
> Roger
> 
> 
> 
> url:    www.econ.uiuc.edu/~roger            Roger Koenker
> email    rkoenker at uiuc.edu            Department of Economics
> vox:     217-333-4558                University of Illinois
> fax:       217-244-6678                Urbana, IL 61801
> 
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
> 
>