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[Lapack] CLAPACK segmentation fault

Hi Mauritz,
CLAPACK has indeed some problems.
If you are using Cygwin, a better way to go would be to use LAPACKE : Standard 
C language APIs for LAPACK
More info here:
LAPACKE depends on LAPACK that is in Fortran, but as you are under Cygwin this 
shouldn't be a problem as gfortran is available
Julie Langou
On Sep 14, 2011, at 7:02 AM, Mauritz van Schalkwyk wrote:


I have compiled CLAPACK-3.2.1 and the associated standard BLAS
under Cygwin using gcc 3.4.4 with optimization turned off for all
libraries.  (Note: I have only compiled the files for double.)
When running xeigtstd I get a segmentation fault:

./xeigtstd < > dsep.out 2>&1
/bin/sh: line 1: 10860 Segmentation fault      (core dumped)
./xeigtstd < > dsep.out 2>&1
make: *** [dsep.out] Error 139

I get this error message for all the input files, and also when
just running xeigtstd by itself, so the problem seems to be
unrelated to a specific input.

The core dump file reads:

Exception: STATUS_STACK_OVERFLOW at eip=005A35BB
eax=002CFBB8 ebx=61243646 ecx=00092D08 edx=00000000 esi=61243653
ebp=0028CD08 esp=0028CD00
program=C:\CLAPACK-3.2.1\TESTING\xeigtstd.exe, pid 12148, thread
cs=0023 ds=002B es=002B fs=0053 gs=002B ss=002B
Stack trace:
Frame     Function  Args
0028CD08  005A35BB  (0059F9BA, 0059B6B8, 6120E728, 0059B715)
0028CD38  0059B7EA  (00000001, 612434EC, 010100F8, 61004BB9)
0028CD68  61007038  (00000000, 0028CDA4, 61006980, 7EFDE000)
End of stack trace

I am not too familiar with gdb but this is what I get when
running under gdb (the code was re-compiled with the -g to get
debug information)

(gdb) r
Starting program: /c/CLAPACK-3.2.1/TESTING/xeigtstd.exe
[New Thread 11092.0x2ecc]
warning: cYgFFFFFFFF 6117EC60
[New Thread 11092.0x29d8]
warning: cYgstd 28cce5 d 3

Program received signal SIGSEGV, Segmentation fault.
0x005a35bb in probe ()
(gdb) backtrace
#0  0x005a35bb in probe ()
#1  0x00000000 in ?? ()

I don't find a probe function in any of the CLAPACK files,
perhaps it comes from another library?

More info:
All the xblat* tests ran without errors, so BLAS appears to be
./xlintstd <  runs fine.

The only related reference to xeigtstd I could find on the LAPACK
forum is

and it went unanswered.

Any idea where to look for the problem?

Thanks in advance for the help.

Mauritz van Schalkwyk

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