Re: Bus error when writing in a typed file

Le 18/11/2012 10:16, Baudouin Le Charlier a écrit :
> Here is a very simple example where the bus error occurs : Le 18 nov.
> 2012 à 02:44, Waldek Hebisch a écrit :
>
>>> Hmm, quick test with Debian gpc did not produce a crash.  It
>>> certainly
>> would help to have example without a lot of interaction.

with busError.pas
  =======================================================
On fedora core 6

[lombardi@lobelie ~/gpc/bugCharlier]$ gpc -v
Reading specs from /usr/local/lib/gcc/x86_64-redhat-linux/3.4.4/specs
Configured with: ../gcc-3.4.4-20050721/configure --disable-shared
--enable-threads=posix --disable-checking --with-system-zlib
--enable-__cxa_atexit --disable-libunwind-exceptions
--enable-languages=c,pascal --enable-multilib --host=x86_64-redhat-linux
Thread model: posix
gpc version 20070904, based on gcc-3.4.4 20050721 (Red Hat 3.4.4-2)
[lombardi@lobelie ~/gpc/bugCharlier]$ gp --version
GP version 0.61 (GNU Pascal Make Utility)
...
[lombardi@lobelie ~/gpc/bugCharlier]$ gp busError.pas
[lombardi@lobelie ~/gpc/bugCharlier]$ ./busError
Segmentation fault

=========================================================
on MingW with DrMingw for JIT debug (understands only stabs)

Maurice@bouvardie ~/gpc/bugCharlier
$ gpc -v
Reading specs from C:/MinGW/bin/../lib/gcc/mingw32/3.4.5/specs
Configured with: ../gcc-3.4.5-20060117-2/configure --with-gcc
--with-gnu-ld --wi
th-gnu-as --host=mingw32 --target=mingw32 --prefix=/mingw
--enable-threads --dis
able-nls --enable-languages=c,pascal --disable-win32-registry
--disable-shared -
-enable-sjlj-exceptions --enable-libgcj --disable-java-awt --without-x
--enable-
java-gc=boehm --disable-libgcj-debug --enable-interpreter
--enable-hash-synchron
ization --enable-libstdcxx-debug
Thread model: win32
gpc version 20070904, based on gcc-3.4.5 (mingw-vista special r3)

Maurice@bouvardie ~/gpc/bugCharlier
$ gp --version
GP version 0-61 (GNU Pascal Make Utility)

Maurice@bouvardie ~/gpc/bugCharlier
$ gp busError -gstabs+

Maurice@bouvardie ~/gpc/bugCharlier
$ busError

DrMingw pops up with message

.............
busError.exe caused an Access Violation at location 0040139d in module 
busError.exe Reading from location 00000594.

Registers:
eax=80000000 ebx=7ffdc000 ecx=00000000 edx=00000304 esi=00432009 
edi=0023ff11
eip=0040139d esp=0023feb0 ebp=0023ff28 iopl=0         nv up ei pl zr na 
po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000 
efl=00000246

Call stack:
AddrPC     AddrReturn AddrFrame  AddrStack  Params
0040139D   004016C0   0023FF28   0023FEB0   00000001   00032C00 
00032F20   00000000
0040139D  busError.exe:0040139D  _p__M0_main_program  buserror.pas:28
Void _p__M0_main_program(
	
)
	...
	begin
	      assign(f, 'toto.pers') ;
 >	      rewrite(f) ;
	      write(f, p) ;
	      close(f)
	...

004016C0   004010FD   0023FF58   0023FEB0   00000001   00032C00 
00032F20   00437000
004016C0  busError.exe:004016C0  main  <implicit code>:31
int32 main(
	int32 argc = 1,
	Cstring * argv = &0x00032bb9,
	Cstring * envp = &0x00032ff0
)
004010FD   00000000   0023FFF0   0023FEB0   00401280   00000000 
78746341   00000020
004010FD 
busError.exe:004010FDc:\Lombardi\mingw\gpc\bugCharlier\busError.exe: No 
symbol found

.................

Maurice

-- 
        Maurice Lombardi
Laboratoire Interdisciplinaire de Physique,
     (ex Spectrometrie Physique)
Universite Joseph Fourier de Grenoble, BP87
38402 Saint Martin d'Heres Cedex     FRANCE
Tel: 33 (0)4 76 51 47 51
Fax: 33 (0)4 76 63 54 95
mailto:[email protected]

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