Re: Linux/Clang/Libobjc2 failure part 2 (ng)

[Riccardo Mottola]

Hi all,

on the same Linux system, if I switch to gcc with its own runtime, 
everything works.
The libxcb/libX11 issue does not reproduce in that case, which hints to 
a more generic memory issue and not a X backend issue.
Thus, essentially I cannot use libobjc2 in either configuration.
I have also a FreeBSD system in similar situation, but there GCC doesn't 
have its runtime, so I cannot test that. However there the "gnu" mode 
doesn't work, but the nex-gen does.
Very tricky?

Riccardo

On 22/06/2018 15:13, Riccardo Mottola wrote:
> Hi all,
>
> on the same system Linux/Clang/libobjc2, I tried reconfiguring 
> everything and rebuilt everything using the Next Gen runtime.
>
> I configured make with:
> $ ./configure --prefix=/ --with-layout=gnustep 
> --with-library-combo=ng-gnu-gnu
>  CC=clang CXX=clang++
>
>
> and then reconfigured/rebuilt everything else.
>
> However GUI apps still crash badly.
>
> I get this:
> Program received signal SIGSEGV, Segmentation fault.
> 0xb74782df in GSPrivateFormat (s=<optimized out>, format=<optimized out>,
>     ap=0xbfffed00 
> "\200\211\205\267\214\211\205\267T\216\205\267\350\201\205\267\217\rL\267\200\066\017\bP=M\267\204\177\205\267\220\177\205\267T\216\205\267\260\200\205\267\244\200\205\267\224\271\061\b\256+d\267x\177\205\267P\200\205\267D\200\205\267\070\200\205\267,\200\205\267 
> \200\205\267\024\200\205\267l\177\205\267\b\200\205\267\374\177\205\267\360\177\205\267\344\177\205\267\330\177\205\267\300\177\205\267\314\177\205\267\264\177\205\267\234\177\205\267L\201\205\267@\201\205\267\064\201\205\267(\201\205\267\034\201\205\267\020\201\205\267\004\201\205\267\370\200\205\267\354\200\205\267\200\200\205\267\340\200\205\267t\200\205\267\324\200\205\267\310\200\205\267\230\200\205\267\214\200\205\267\\\200\205\267\274\200\205\267<\216\205\267"..., 
> locale=<optimized out>) at GSFormat.m:910
> 910           workend = &work_buffer[sizeof (work_buffer) / sizeof 
> (unichar)];
> (gdb) bt
> #0  0xb74782df in GSPrivateFormat (s=<optimized out>, 
> format=<optimized out>,
>     ap=0xbfffed00 
> "\200\211\205\267\214\211\205\267T\216\205\267\350\201\205\267\217\rL\267\200\066\017\bP=M\267\204\177\205\267\220\177\205\267T\216\205\267\260\200\205\267\244\200\205\267\224\271\061\b\256+d\267x\177\205\267P\200\205\267D\200\205\267\070\200\205\267,\200\205\267 
> \200\205\267\024\200\205\267l\177\205\267\b\200\205\267\374\177\205\267\360\177\205\267\344\177\205\267\330\177\205\267\300\177\205\267\314\177\205\267\264\177\205\267\234\177\205\267L\201\205\267@\201\205\267\064\201\205\267(\201\205\267\034\201\205\267\020\201\205\267\004\201\205\267\370\200\205\267\354\200\205\267\200\200\205\267\340\200\205\267t\200\205\267\324\200\205\267\310\200\205\267\230\200\205\267\214\200\205\267\\\200\205\267\274\200\205\267<\216\205\267"..., 
> locale=<optimized out>) at GSFormat.m:910
> #1  0xb748e404 in -[GSPlaceholderString 
> initWithFormat:locale:arguments:] (
>     self=<optimized out>, _cmd=0xb788f478 <.objc_selector_list+272>,
>     format=<optimized out>, locale=<optimized out>, argList=<optimized 
> out>)
>     at GSString.m:1618
> #2  0xb75abc32 in -[NSString initWithFormat:] (self=<optimized out>,
>     _cmd=<optimized out>, format=<optimized out>) at NSString.m:1343
> #3  0xb74c160c in +[NSBundle initialize] (self=<optimized out>,
>     _cmd=<optimized out>) at NSBundle.m:1180
> #4  0xb72e1179 in objc_send_initialize ()
>    from /System/Library/Libraries/libobjc.so.4.6
> #5  0xb72ef4e8 in slowMsgLookup ()
>    from /System/Library/Libraries/libobjc.so.4.6
>
>
> However, if I recompile base with "debug=yes" the issue looks totally 
> different!
> This almost looks like a X11/back issue, or at least, the crash 
> happens inside there, but it could be an effect.
>
> Any ideas??
>
>
> #0  0xb3fbb141 in xcb_writev () from /usr/lib/libxcb.so.1
> #1  0xb41740f2 in _XSend () from /usr/lib/libX11.so.6
> #2  0xb41746ad in _XReply () from /usr/lib/libX11.so.6
> #3  0xb415a170 in XGetWindowProperty () from /usr/lib/libX11.so.6
> #4  0xb4158f54 in XGetIconSizes () from /usr/lib/libX11.so.6
> #5  0xb454ccb9 in -[XGServer(WindowOps) iconSize] (self=<optimized out>,
>     _cmd=0xb7f76e98 <.objc_selector_list+72>) at XGServerWindow.m:4565
> #6  0xb7cea457 in GSGetIconSize () at GSIconManager.m:88
> #7  0xb7b487c0 in +[NSAppIconView initialize] (self=<optimized out>,
>     _cmd=<optimized out>) at NSApplication.m:526
> #8  0xb7243179 in objc_send_initialize ()
>    from /System/Library/Libraries/libobjc.so.4.6
> #9  0xb72514e8 in slowMsgLookup ()
>    from /System/Library/Libraries/libobjc.so.4.6
> #10 0xb7255251 in objc_msgSend () from 
> /System/Library/Libraries/libobjc.so.4.6
> #11 0xb7b4fea9 in -[NSApplication(Private) _appIconInit] (
>     self=<optimized out>, _cmd=<optimized out>) at NSApplication.m:3863
> #12 0xb7b49915 in -[NSApplication _init] (self=0x8377c94,
>     _cmd=0xb7eac120 <.objc_selector_list+1344>) at NSApplication.m:924
> #13 0xb75563c2 in -[NSObject performSelector:withObject:] 
> (self=0x8377c94,
>     _cmd=0xb788f848 <.objc_selector_list+424>,
>     aSelector=0xb7eac120 <.objc_selector_list+1344>, anObject=0x8377c94)
>     at NSObject.m:2009
> #14 0xb75ec255 in -[NSObject(NSThreadPerformAdditions) 
> performSelector:onThread:withObject:waitUntilDone:modes:] 
> (self=0x8377c94,
>     _cmd=0xb788f7a0 <.objc_selector_list+256>,
>     aSelector=0xb7eac120 <.objc_selector_list+1344>, aThread=0x82ffa84,
>     anObject=0x8377c94, aFlag=1 '\001', anArray=0x8379634) at 
> NSThread.m:2136
> #15 0xb75ebedf in -[NSObject(NSThreadPerformAdditions) 
> performSelectorOnMainThread:withObject:waitUntilDone:modes:] 
> (self=0x8377c94,
>     _cmd=0xb788f7b8 <.objc_selector_list+280>,
>     aSelector=0xb7eac120 <.objc_selector_list+1344>, anObject=0x8377c94,
>     aFlag=1 '\001', anArray=0x8379634) at NSThread.m:2091
> #16 0xb75ebf84 in -[NSObject(NSThreadPerformAdditions) 
> performSelectorOnMainThread:withObject:waitUntilDone:] (self=0x8377c94,
>     _cmd=0xb7eac5d8 <.objc_selector_list+2552>,
>     aSelector=0xb7eac120 <.objc_selector_list+1344>, anObject=0x8377c94,
>     aFlag=1 '\001') at NSThread.m:2102
> #17 0xb7b49ccf in -[NSApplication init] (self=0x8377c94, 
> _cmd=<optimized out>)
>     at NSApplication.m:978
> #18 0xb7b49641 in +[NSApplication sharedApplication] (self=<optimized 
> out>,
>     _cmd=<optimized out>) at NSApplication.m:850
> #19 0xb7b30266 in NSApplicationMain (argc=<optimized out>,
>     argv=<optimized out>) at Functions.m:78
> #20 0x08050400 in main (argc=<optimized out>, argv=<optimized out>)
>     at main.m:30
>
>
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