I used a tarball from the website. I'll try and find out a git/svn url and checkout the head revision of the trunk.
--
Laurent
Hi Laurent,
This doesn't look like the code from trunk. Are you using an old release? As I said, I think this bug is fixed some months ago.
David
On 6 Mar 2013, at 01:12, Laurent Michel <address@hidden> wrote:
David,
I recompiled and here is the trace:
Program received signal SIGSEGV, Segmentation fault.
0xb7a55695 in isEmptyProtocol (aProto=0xb7736f90) at protocol.c:62
62 isEmpty &= (p2->properties->count == 0);
(gdb) where
#0 0xb7a55695 in isEmptyProtocol (aProto=0xb7736f90) at protocol.c:62
#1 0xb7a5553e in unique_protocol (aProto=0xb7736f90) at protocol.c:118
#2 0xb7a534eb in init_protocols (protocols=0xb7736fb0) at protocol.c:189
#3 0xb7a534da in init_protocols (protocols=0xb773a0c0) at protocol.c:186
#4 0xb7a5328a in objc_init_protocols (protocols=0xb773a0c0) at protocol.c:196
#5 0xb7a48264 in load_category (cat=0xb773a2c0, class=0xb7a64340) at category_loader.c:38
#6 0xb7a47f02 in try_load_category (cat=0xb773a2c0) at category_loader.c:50
#7 0xb7a47e6a in objc_try_load_category (cat=0xb773a2c0) at category_loader.c:63
#8 0xb7a5143f in __objc_exec_class (module=0xb773a398) at loader.c:89
#9 0xb76c55a4 in .objc_load_function () from /home/ldm/work/platform/Clo/queens2/../ORFoundation/libORFoundation.so
#10 0xb7fece9b in ?? () from /lib/ld-linux.so.2
#11 0xb7fecf84 in ?? () from /lib/ld-linux.so.2
#12 0xb7fdf20f in ?? () from /lib/ld-linux.so.2
So line 62.
It won't show the variables though:
(gdb) p *p2
$3 = {
isa = 0xb7a642f0,
name = 0xb771df54 "ORExpr",
protocol_list = 0xb7795a18,
instance_methods = 0xb7795a20,
class_methods = 0xb7795a20,
optional_instance_methods = 0xb7795a20,
optional_class_methods = 0xb7795a20,
properties = 0x0,
optional_properties = 0x0
}
(gdb) l
57 if (aProto->isa == ObjC2ProtocolClass)
58 {
59 struct objc_protocol2 *p2 = (struct objc_protocol2*)aProto;
60 isEmpty &= (p2->optional_instance_methods->count == 0);
61 isEmpty &= (p2->optional_class_methods->count == 0);
62 isEmpty &= (p2->properties->count == 0);
63 isEmpty &= (p2->optional_properties->count == 0);
64 }
65 return isEmpty;
66 }
So p2->properties is NULL and trying to access the count attribute crashes. This is happening on a protocol
of mine (ORExpr) which inherits from other protocols:
@protocol ORExpr <ORConstraint,NSObject,NSCoding>
-(id<ORTracker>) tracker;
-(ORInt) min;
-(ORInt) max;
-(BOOL) isConstant;
-(BOOL) isVariable;
....
@end
Any ideas?
On Mar 5, 2013, at 7:20 AM, Laurent Michel <address@hidden> wrote:
On Mar 5, 2013, at 4:10 AM, David Chisnall <address@hidden> wrote:
Hi,
How old is your runtime? Without debugging symbols, this looks like it might be a bug that was fixed in May last year. It would really help if you could do a debug build of the runtime and let me know exactly what is failing. If you do ccmake . in your libobjc2 build directory, and change the build type to Debug, you should get the symbols.
libobjc2 was 1.6.1
address@hidden:/usr/local/src/old$ sha1sum libobjc2-1.6.tar.gz
348ab64899b25ecb2bfdfd13ebeeab2d6a2c8988 libobjc2-1.6.tar.gz
total 9196
drwxr-xr-x 4 root root 4096 Mar 4 08:37 GNUstep
lrwxrwxrwx 1 root root 23 Mar 4 08:37 libgnustep-base.so -> libgnustep-base.so.1.24
lrwxrwxrwx 1 root root 25 Mar 4 08:37 libgnustep-base.so.1.24 -> libgnustep-base.so.1.24.3
-rwxr-xr-x 1 root root 9105637 Mar 4 08:36 libgnustep-base.so.1.24.3
-r--r--r-- 1 root root 136452 May 18 2012 libobjc.a
lrwxrwxrwx 1 root root 31 May 18 2012 libobjc.so -> /usr/local/lib/libobjc.so.4.6.0
lrwxrwxrwx 1 root root 31 May 18 2012 libobjc.so.4 -> /usr/local/lib/libobjc.so.4.6.0
lrwxrwxrwx 1 root root 31 May 18 2012 libobjc.so.4.6 -> /usr/local/lib/libobjc.so.4.6.0
-r--r--r-- 1 root root 140820 May 18 2012 libobjc.so.4.6.0
lrwxrwxrwx 1 root root 33 May 18 2012 libobjcxx.so -> /usr/local/lib/libobjcxx.so.4.6.0
lrwxrwxrwx 1 root root 33 May 18 2012 libobjcxx.so.4 -> /usr/local/lib/libobjcxx.so.4.6.0
lrwxrwxrwx 1 root root 33 May 18 2012 libobjcxx.so.4.6 -> /usr/local/lib/libobjcxx.so.4.6.0
-r--r--r-- 1 root root 13002 May 18 2012 libobjcxx.so.4.6.0
drwxrwsr-x 4 root staff 4096 Mar 3 13:33 python2.7
address@hidden:/usr/local/lib$
I was looking yesterday night for a more recent tar ball, but couldn't locate one.
I'll recompile libobjc2 in debug and will update you. Thanks for the info David!
--
Laurent
David
On 5 Mar 2013, at 01:37, Laurent Michel <address@hidden> wrote:
PS/ I decided to recompile GNUstep simply because I was experiencing a crash with my compiled binary during the
library initializations of GNUstep/libobjc. Namely, here is the backtrace:
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
[New Thread 0xb7021b40 (LWP 8378)]
Program received signal SIGSEGV, Segmentation fault.
0xb7a58d50 in init_protocols () from /usr/local/lib/libobjc.so
(gdb) where
#0 0xb7a58d50 in init_protocols () from /usr/local/lib/libobjc.so
#1 0xb7a58c47 in init_protocols () from /usr/local/lib/libobjc.so
#2 0xb7a588c1 in objc_init_protocols () from /usr/local/lib/libobjc.so
#3 0xb7a517e3 in objc_try_load_category () from /usr/local/lib/libobjc.so
#4 0xb7a57251 in __objc_exec_class () from /usr/local/lib/libobjc.so
#5 0xb76d15d4 in .objc_load_function () from /home/ldm/work/platform/Clo/queens2/../ORFoundation/libORFoundation.so
#6 0xb7fece9b in ?? () from /lib/ld-linux.so.2
#7 0xb7fecf84 in ?? () from /lib/ld-linux.so.2
#8 0xb7fdf20f in ?? () from /lib/ld-linux.so.2
(gdb) quit
A debugging session is active.
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