Hi,
I am trying to identify the octave segfault, last reported on
http://cygwin.com/ml/cygwin-announce/2011-08/msg00003.html
To reproduce: run octave from xterm and at prompt
-------------------------
graphics_toolkit ("fltk")
x=1:10;
plot(x,x)
print("fltk.png","-dpng")
-------------------------
the plot is built and printed as file but octave crashes.
After builiding cygwin (cvs), octave and fltk with
gcc-4.5.3 I was able to identify the SIGSEV in cygwin pclose.
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 5980.0x164c]
pclose (fp=0x7ffdf000) at
/pub/cygwin/cvs/src_new/winsup/cygwin/syscalls.cc:4026
4026 if (fh->get_device () != FH_PIPEW && fh->get_device () !=
FH_PIPER)
(gdb) l
4021 int
4022 pclose (FILE *fp)
4023 {
4024 fhandler_pipe *fh = (fhandler_pipe *) cygheap->fdtab[fileno(fp)];
4025
4026 if (fh->get_device () != FH_PIPEW && fh->get_device () !=
FH_PIPER)
4027 {
4028 set_errno (EBADF);
4029 return -1;
4030 }
the pclose is relative to a single popen call:
Breakpoint 1, popen (
command=0x207e969c "/usr/bin/gs -dQUIET -dNOPAUSE -dBATCH -dSAFER
-sDEVICE=png16m -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -r150x150
-dEPSCrop -sOutputFile=fltk.png -", in_type=0x1a45b18 "w")
at /pub/cygwin/cvs/src_new/winsup/cygwin/syscalls.cc:3920
3920 {
and the SIGSEV seems to happen inside NTDLL
Program received signal SIGSEGV, Segmentation fault.
0x7c90e514 in ntdll!LdrAccessResource ()
from /cygdrive/c/WINDOWS/system32/ntdll.dll
(gdb) bt
#0 0x7c90e514 in ntdll!LdrAccessResource ()
from /cygdrive/c/WINDOWS/system32/ntdll.dll
#1 0x7c90df5a in ntdll!ZwWaitForSingleObject ()
from /cygdrive/c/WINDOWS/system32/ntdll.dll
#2 0x7c8025db in WaitForSingleObjectEx ()
from /cygdrive/c/WINDOWS/system32/kernel32.dll
#3 0x0000046c in ?? ()
#4 0x00000000 in ?? ()
(gdb)
At this point I am really lost as I have no clue of the
popen/pclose internal interaction, so any suggestion is
really appreciated
thanks
Marco
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