bug#17598: Emacs pretest 24.3.91 - AIX - SIGSEV when customize

[Gilles PION]

> > $ MALLOCTYPE=debug MALLOEBUG=validate_ptrs
 ./emacs-24.3.91/src/temacs
> > --no-site-file  --no-init-file
> > Fatal error 11: Segmentation violationMemory fault
> >
> 
> Have you gone back to the 24.3.91 unexaix.c (with the short fix I
sent 
> you), or are you using the much bigger change I sent you later?  For
now 
> I'll assume the former.  Also, I assume you're still configuring
with 
> --enable-checking=all.
I was using the latest unexaix.c, going back to previous
one now

> 
> Unfortunately AIX uses the relocating allocator in ralloc.c, not the
> system malloc, so MALLOCTYPE and MALLOCDEBUG (misspelled above) aren't
> likely to be helpful.  If you want to try the system malloc,
please 
> comment out "#define REL_ALLOC 1" in src/config.h, change
"#undef 
> SYSTEM_MALLOC" to "#define SYSTEM_MALLOC 1" in the
same file, and 
> comment out "RALLOC_OBJ=ralloc.o" in src/Makefile (though
now of course 
> we're debugging a different program....).

OK, recompiling with those fixes (after configuring
using "CFLAGS="-O0 -g3" ):
1rst step: ./configure
2nd step: fix src/config.h as indicated
3rd step make

> 
> Also, did you actually use "MALLOEBUG"?  That looks
like a typo.
You're right, sorry.

> 
> Once you've fixed the above, how about this?
> 
> MALLOCTYPE=debug 
> MALLOCDEBUG=postfree_checking,validate_ptrs,stack_depth:1000 ./temacs
-Q

$ MALLOCTYPE=debug   MALLOCDEBUG=postfree_checking,validate_ptrs,stack_depth:1000
./temacs -Q
Fatal error 11: Segmentation violationMemory fault

> 
> or this?
> 
> gdb temacs
> (gdb) set env MALLOCTYPE debug
> (gdb) set env MALLOCDEBUG postfree_checking,validate_ptrs,stack_depth:200
> (gdb) run -Q

(gdb) set env MALLOCTYPE debug
(gdb) set env MALLOCDEBUG postfree_checking,validate_ptrs,stack_depth:200
(gdb) run -Q
Starting program: /sg/paxdev01/D1stunix/src/emacs/24.3.91/emacs-24.3.91/src/temacs
-Q
[New Thread 1]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1]
0xd0128c78 in extend_brk () from /usr/lib/libc.a(shr.o)
(gdb) where
#0  0xd0128c78 in extend_brk () from /usr/lib/libc.a(shr.o)

> 
> Please also try with the "-nw" option, e.g., "./temacs
-Q -nw" or "run 
> -Q -nw".
It's the same 

Note that  the immediate crash occurs only when
MALLOC* variables are defined.

> 
> A couple of issues that may or may not be related.  On my AIX
7 host I 
> have to configure --with-jpeg=no --with-png=no --with-gif=no 
> --with-tiff=no because those libraries are not installed.  On
my 
> platform pkg-config dumps core (don't know why) so I'm not using any
of 
> the fancy libraries you're probably using.  This (along with
the fact 
> that I can't run X) makes it hard for me to reproduce the problem.

I understand, I've also disabled graphic libraries
execpt png (using a emacs dedicated version)

I'm on aix 6.1, since I've been unable to compile
on AIX 7.1:

configure: error: Emacs does not support `powerpc-ibm-aix7.1.0.0'
systems.
If you think it should, please send a report to bug-gnu-emacs@gnu.org.
Check `etc/MACHINES' for recognized configuration
names.

Used gcc binary from 6.1 there ^^^

Since I'missing native 7.1 compatible compiler to
re-boostrap gcc.


NB: I won't be reachable at my office tomorrow, will
return only friday

Next week, won't be very available until Thursday
too.

--
Gilles





                                                                   
                                                                   
                                           
                                                                   
                                                                   
                  



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