Re: Cairo backend seems broken - mainScreen visibleFrame has no size

[Riccardo Mottola]

Hi!

I updated my laptop (NetBSD / amd64 / gcc compiler and runtime) and now 
all GUI apps crash on startup:


Starting program: /Local/Tools/Ink
Xlib:  extension "MIT-SHM" missing on display "localhost:11.0".
2020-01-31 14:58:52.354 Ink[14930:130845475800848] styleoffsets ... 
guessing offsets

Program received signal SIGSEGV, Segmentation fault.
0x00007700c986b6b7 in -[XGServer(WindowOps) boundsForScreen:] 
(self=0x7700d4c87010,
    _cmd=0x7700c9ab4150 <_OBJC_SELECTOR_TABLE+1808>, screen=0) at 
XGServerWindow.m:4528
4528      if (output_info->crtc)
(gdb) bt
#0  0x00007700c986b6b7 in -[XGServer(WindowOps) boundsForScreen:] 
(self=0x7700d4c87010,
    _cmd=0x7700c9ab4150 <_OBJC_SELECTOR_TABLE+1808>, screen=0) at 
XGServerWindow.m:4528
#1  0x00007700c98600d2 in -[XGServer(WindowOps) _OSFrameToXFrame:for:] 
(self=0x7700d4c87010,
    _cmd=0x7700c9ab4430 <_OBJC_SELECTOR_TABLE+2544>, o=..., 
window=0x7700d6135c80) at XGServerWindow.m:512
#2  0x00007700c986423d in -[XGServer(WindowOps) window::::] 
(self=0x7700d4c87010,
    _cmd=0x7700c9ab4390 <_OBJC_SELECTOR_TABLE+2384>, frame=..., type=2, 
style=64, screen=0) at XGServerWindow.m:1917
#3  0x00007700c9863498 in -[XGServer(WindowOps) _setupRootWindow] 
(self=0x7700d4c87010,
    _cmd=0x7700c9ab0030 <_OBJC_SELECTOR_TABLE+400>) at 
XGServerWindow.m:1614
#4  0x00007700c98560fb in -[XGServer _initXContext] 
(self=0x7700d4c87010, _cmd=0x7700c9ab0080 <_OBJC_SELECTOR_TABLE+480>)
    at XGServer.m:469
#5  0x00007700c9856278 in -[XGServer initWithAttributes:] 
(self=0x7700d4c87010,
    _cmd=0x7700d60b4550 <_OBJC_SELECTOR_TABLE+144>, info=0x0) at 
XGServer.m:487
#6  0x00007700d5c2db71 in +[GSDisplayServer serverWithAttributes:] ()
   from /System/Library/Libraries/libgnustep-gui.so.0.28.0
#7  0x00007700d5a31715 in -[NSApplication _init] () from 
/System/Library/Libraries/libgnustep-gui.so.0.28.0
#8  0x00007700d50f87d1 in -[NSObject performSelector:withObject:] ()
   from /System/Library/Libraries/libgnustep-base.so.1.27.0
#9  0x00007700d5180760 in -[NSObject(NSThreadPerformAdditions) 
performSelector:onThread:withObject:waitUntilDone:modes:]
    () from /System/Library/Libraries/libgnustep-base.so.1.27.0
#10 0x00007700d518061c in -[NSObject(NSThreadPerformAdditions) 
performSelectorOnMainThread:withObject:waitUntilDone:modes:] () from 
/System/Library/Libraries/libgnustep-base.so.1.27.0
#11 0x00007700d518068b in -[NSObject(NSThreadPerformAdditions) 
performSelectorOnMainThread:withObject:waitUntilDone:] ()
   from /System/Library/Libraries/libgnustep-base.so.1.27.0
#12 0x00007700d5a31b89 in -[NSApplication init] () from 
/System/Library/Libraries/libgnustep-gui.so.0.28.0
#13 0x00007700d5a3167e in +[NSApplication sharedApplication] () from 
/System/Library/Libraries/libgnustep-gui.so.0.28.0
#14 0x00007700d5a11699 in NSApplicationMain () from 
/System/Library/Libraries/libgnustep-gui.so.0.28.0
#15 0x00000000004019db in gnustep_base_user_main ()
#16 0x00007700d512ac8b in main () from 
/System/Library/Libraries/libgnustep-base.so.1.27.0
#17 0x00000000004017fc in ___start ()
#18 0x00007f7e8a60cc38 in ?? () from /usr/libexec/ld.elf_so
#19 0x0000000000000001 in ?? ()
#20 0x00007f7fffaecf48 in ?? ()
#21 0x0000000000000000 in ?? ()


the structure is null and needs to be checked.
I also noticed that in case the call fails, there is no fallback. I 
restructured the code a little bit and pushed a fix. At least, now it 
does not crash for me anymore and Ink comes up and shows windows :-)

However, I sstill get issues with X:

2020-01-31 15:07:47.335 Ink[27979:125763785598736] X-Windows error - 
BadRROutput (invalid Output parameter)
          on display: localhost:11.0
                type: 0
       serial number: 576
        request code: 138


and even windowmaker when a GS application starts.


wmaker(catchXError(startup.c:118)): warning: internal X error: BadMatch 
(invalid parameter attributes)
        Request code: 12 X_ConfigureWindow
        Request minor code: 0
        Resource ID: 0x600003
        Error serial: 59874



Regards,
Riccardo