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From: Marco Atzeri <marco.atzeri@gmail.com>
Subject: SIGSEGV before main ? and gcc-debuginfo
To: "cygwin@cygwin.com" <cygwin@cygwin.com>
Message-ID: <55A0C41E.6080203@gmail.com>
Date: Sat, 11 Jul 2015 09:22:06 +0200
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trying to debug latest release candidate of netcdf
I hit this SIGSEGV before reaching main

$ gdb .libs/ctest.exe
GNU gdb (GDB) Cygwin 7.9.1-1
.....
Reading symbols from .libs/ctest.exe...done.
(gdb) break main
Breakpoint 1 at 0x100401171: file 
/pub/devel/netcdf/prova/netcdf-c-4.4.0-rc2/ncdump/ctest.c, line 32.
(gdb) run
Starting program: 
/cygdrive/e/cyg_pub/devel/netcdf/prova/netcdf-c-4.4.0-rc2_build64/ncdump/.libs/ctest.exe
[New Thread 9476.0x2a88]
[New Thread 9476.0x1fa0]
[New Thread 9476.0x9a8]

Program received signal SIGSEGV, Segmentation fault.
___chkstk_ms () at 
/usr/src/debug/gcc-4.9.3-1/libgcc/config/i386/cygwin.S:146
146             orq     $0x0, (%rcx)            /* probe there */

I thought it was a stack issue and I raised from 2M to 8M

SizeOfStackReserve      0000000000200000

SizeOfStackReserve      00000000007a1200

with no success.

May be it is not a netcdf bug ? Ideas what to look for ?


$ uname -svr
CYGWIN_NT-6.1 2.0.4(0.287/5/3) 2015-06-09 12:22


In addition there is a problem with gcc-debuginfo

  $ cygcheck -l gcc-debuginfo |grep cygwin.S
/usr/src/debug/gcc-4.9.3-1/libgcc/config/i386/cygwin.S

(gdb) break ___chkstk_ms
Breakpoint 2 at 0x100407a60: ___chkstk_ms. (5 locations)
(gdb) run
Starting program: 
/cygdrive/e/cyg_pub/devel/netcdf/prova/netcdf-c-4.4.0-rc2_build64/ncdump/.libs/ctest.exe
[New Thread 6656.0x2980]

Breakpoint 2, ___chkstk_ms () at ../../../libgcc/config/i386/cygwin.S:137
137     ../../../libgcc/config/i386/cygwin.S: No such file or directory.

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