Re: gui apps segfault on Linux/x86/clang/libobjc2

[Riccardo Mottola]

Hi,


Fred Kiefer wrote:

> > is that where you would check? The stacktrace is corrupt and I can't get the 
> > exact place of the call.
>
> Yes, this is what I meant. Now you could compare this number to the display 
> allocated for us in libs-back/Source/x11/XGServer.m at about line 422. Just 
> print that out with a similar statement and the two numbers should match.
> What is quite strange in your output is that this is reported twice. This looks 
> like the icon size method gets called two times. This would mean that the first 
> time this is handle correctly but fails the second time. could it be that these 
> two calls happen at the same time? Could you also please print out the thread 
> that is making these calls?

The numbers do match:

multix@think ~/gnustep-cvs/libs-back $ Ink
2018-12-07 00:48:18.639 Ink[7166:7166] XGServer init-context dpy: 150880672
2018-12-07 00:48:18.650 Ink[7166:7166] styleoffsets ... guessing offsets
2018-12-07 00:48:18.650 Ink[7166:7166] styleoffsets ... guessing offsets
2018-12-07 00:48:19.073 Ink[7166:7166] iconsize - dpy 150880672
2018-12-07 00:48:19.074 Ink[7166:7166] iconsize - dpy 150880672
Segmentation fault

I don't know how to print out the thread, I too think that two calls 
aren't good.

I tried putting a breakpoint and getting the stacktraces for the two 
calls and they are:
4565      NSLog(@"iconsize - dpy %lu", (unsigned long)dpy);
(gdb) bt
#0  -[XGServer(WindowOps) iconSize] (self=0x8434f64, _cmd=0xb7f74b30 
<.objc_selector_list+88>) at XGServerWindow.m:4565
#1  0xb7d41c5a in GSGetIconFrame () from 
/System/Library/Libraries/libgnustep-gui.so.0.26
#2  0xb7a6251f in -[NSApplication(Private) _appIconInit] () from 
/System/Library/Libraries/libgnustep-gui.so.0.26
#3  0xb7a58041 in -[NSApplication _init] () from 
/System/Library/Libraries/libgnustep-gui.so.0.26
#4  0xb7455232 in -[NSObject performSelector:withObject:] () from 
/System/Library/Libraries/libgnustep-base.so.1.25
#5  0xb74eb675 in -[NSObject(NSThreadPerformAdditions) 
performSelector:onThread:withObject:waitUntilDone:modes:] ()
   from /System/Library/Libraries/libgnustep-base.so.1.25
#6  0xb74eb2ec in -[NSObject(NSThreadPerformAdditions) 
performSelectorOnMainThread:withObject:waitUntilDone:modes:] ()
   from /System/Library/Libraries/libgnustep-base.so.1.25
#7  0xb74eb391 in -[NSObject(NSThreadPerformAdditions) 
performSelectorOnMainThread:withObject:waitUntilDone:] ()
   from /System/Library/Libraries/libgnustep-base.so.1.25
#8  0xb7a58420 in -[NSApplication init] () from 
/System/Library/Libraries/libgnustep-gui.so.0.26
#9  0xb7a57bbf in +[NSApplication sharedApplication] () from 
/System/Library/Libraries/libgnustep-gui.so.0.26
#10 0xb7a2c6f2 in NSApplicationMain () from 
/System/Library/Libraries/libgnustep-gui.so.0.26
#11 0x0804ab52 in main ()

4565      NSLog(@"iconsize - dpy %lu", (unsigned long)dpy);
(gdb) bt
#0  -[XGServer(WindowOps) iconSize] (self=0x8434f64, _cmd=0xb7f74b30 
<.objc_selector_list+88>) at XGServerWindow.m:4565
#1  0xb7d418fe in GSGetIconSize () from 
/System/Library/Libraries/libgnustep-gui.so.0.26
#2  0xb7a56380 in +[NSAppIconView initialize] () from 
/System/Library/Libraries/libgnustep-gui.so.0.26
#3  0xb714015c in objc_send_initialize () from 
/System/Library/Libraries/libobjc.so.4.6
#4  0xb714c4d8 in slowMsgLookup () from 
/System/Library/Libraries/libobjc.so.4.6
#5  0xb71525e1 in objc_msgSend () from 
/System/Library/Libraries/libobjc.so.4.6
#6  0xb7a626cd in -[NSApplication(Private) _appIconInit] () from 
/System/Library/Libraries/libgnustep-gui.so.0.26
#7  0xb7a58041 in -[NSApplication _init] () from 
/System/Library/Libraries/libgnustep-gui.so.0.26
#8  0xb7455232 in -[NSObject performSelector:withObject:] () from 
/System/Library/Libraries/libgnustep-base.so.1.25
#9  0xb74eb675 in -[NSObject(NSThreadPerformAdditions) 
performSelector:onThread:withObject:waitUntilDone:modes:] ()
   from /System/Library/Libraries/libgnustep-base.so.1.25
#10 0xb74eb2ec in -[NSObject(NSThreadPerformAdditions) 
performSelectorOnMainThread:withObject:waitUntilDone:modes:] ()
   from /System/Library/Libraries/libgnustep-base.so.1.25
#11 0xb74eb391 in -[NSObject(NSThreadPerformAdditions) 
performSelectorOnMainThread:withObject:waitUntilDone:] ()
   from /System/Library/Libraries/libgnustep-base.so.1.25
#12 0xb7a58420 in -[NSApplication init] () from 
/System/Library/Libraries/libgnustep-gui.so.0.26
#13 0xb7a57bbf in +[NSApplication sharedApplication] () from 
/System/Library/Libraries/libgnustep-gui.so.0.26
#14 0xb7a2c6f2 in NSApplicationMain () from 
/System/Library/Libraries/libgnustep-gui.so.0.26
#15 0x0804ab52 in main ()
(gdb)

they are two calls for icon frame and size? Maybe this causes issues?
Concurrency?

Riccardo