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

From: Riccardo Mottola
Subject: Re: gui apps segfault on Linux/x86/clang/libobjc2
Date: Sun, 2 Dec 2018 15:21:49 +0100
User-agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101 SeaMonkey/2.49.4

Hi Fred,

I would rather not point the bug into xcb or X11, other non-gnustep apps do work fine, including sensitive apps like Firefox and emacs.

Fred Kiefer wrote:
Both the reported issues should be rather harmless. For the one in back I 
already committed a fix to prevent it. Please try with the current version on 

INdeed, updating back makes the error go away in valgrind (but... not the segfault)

I will look into the base issue as well, but expect that this is also not the 
cause of your problem. It is far more interesting that you get the segmentation 
fault only when not running with valgrind. Is the stack trace of the 
segmentation fault still the same?

"interesting" but what does it tell us? Valgrind is preventing some memory damage: It is a matter of Heiseberg, trying to measure modifies the object of measure! It may happen with gdb too, but not in this case.

==9086== Source and destination overlap in memcpy(0x9e68c18, 0x9e68c18, 24)
==9086== at 0x4035409: __GI_memcpy (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so) ==9086== by 0x4C1224C: _i_GSFFIInvocation__initWithCallback_values_frame_signature_ (in /System/Library/Libraries/libgnustep-base.so.1.25.1) ==9086== by 0x4C1359A: GSFFIInvocationCallback (in /System/Library/Libraries/libgnustep-base.so.1.25.1)
==9086==    by 0x7566A74: ??? (in /usr/lib/libffi.so.6.0.4)
==9086==    by 0x7566E25: ??? (in /usr/lib/libffi.so.6.0.4)
==9086== by 0x4A776EA: _i_NSDistributedNotificationCenter_Private__connect (in /System/Library/Libraries/libgnustep-base.so.1.25.1) ==9086== by 0x4A75C22: _i_NSDistributedNotificationCenter__addObserver_selector_name_object_suspensionBehavior_ (in /System/Library/Libraries/libgnustep-base.so.1.25.1) ==9086== by 0x4A7592D: _i_NSDistributedNotificationCenter__addObserver_selector_name_object_ (in /System/Library/Libraries/libgnustep-base.so.1.25.1) ==9086== by 0x4558336: _i__GSWorkspaceCenter__init (in /System/Library/Libraries/libgnustep-gui.so.0.26.2) ==9086== by 0x4AFACCA: _c_NSObject__new (in /System/Library/Libraries/libgnustep-base.so.1.25.1) ==9086== by 0x455A2C4: _i_NSWorkspace__init (in /System/Library/Libraries/libgnustep-gui.so.0.26.2) ==9086== by 0x455A06B: _c_NSWorkspace__sharedWorkspace (in /System/Library/Libraries/libgnustep-gui.so.0.26.2)
2018-12-02 15:06:56.370 Ink[9086:9086] Unable to contact pasteboard server - please ensure that gpbs is running for local host. 2018-12-02 15:07:09.316 Ink[9086:9086] Unable to contact pasteboard server - please ensure that gpbs is running for local host.
==9086== HEAP SUMMARY:
==9086==     in use at exit: 7,056,137 bytes in 65,574 blocks
==9086== total heap usage: 224,958 allocs, 159,384 frees, 24,190,943 bytes allocated
==9086== LEAK SUMMARY:
==9086==    definitely lost: 429,675 bytes in 9,125 blocks
==9086==    indirectly lost: 21,386 bytes in 1,258 blocks
==9086==      possibly lost: 1,589,835 bytes in 14,925 blocks
==9086==    still reachable: 5,015,241 bytes in 40,266 blocks
==9086==                       of which reachable via heuristic:
==9086== newarray : 46,317 bytes in 1,466 blocks
==9086==         suppressed: 0 bytes in 0 blocks
==9086== Rerun with --leak-check=full to see details of leaked memory
==9086== For counts of detected and suppressed errors, rerun with: -v
==9086== ERROR SUMMARY: 10 errors from 1 contexts (suppressed: 1 from 1)

Program received signal SIGSEGV, Segmentation fault.
0xb3ead101 in xcb_writev () from /usr/lib/libxcb.so.1
(gdb) bt
#0  0xb3ead101 in xcb_writev () from /usr/lib/libxcb.so.1
#1  0xb40473ce in _XSend () from /usr/lib/libX11.so.6
#2  0xb40479c1 in _XReply () from /usr/lib/libX11.so.6
#3  0xb402d45e in XGetWindowProperty () from /usr/lib/libX11.so.6
#4  0xb402c253 in XGetIconSizes () from /usr/lib/libX11.so.6
#5 0xb4438452 in -[XGServer(WindowOps) iconSize] () from /System/Library/Bundles/libgnustep-back-026.bundle/libgnustep-back-026 #6 0xb7d418fe in GSGetIconSize () from /System/Library/Libraries/libgnustep-gui.so.0.26 #7 0xb7a56380 in +[NSAppIconView initialize] () from /System/Library/Libraries/libgnustep-gui.so.0.26 #8 0xb714015c in objc_send_initialize () from /System/Library/Libraries/libobjc.so.4.6 #9 0xb714c4d8 in slowMsgLookup () from /System/Library/Libraries/libobjc.so.4.6 #10 0xb71525e1 in objc_msgSend () from /System/Library/Libraries/libobjc.so.4.6 #11 0xb7a626cd in -[NSApplication(Private) _appIconInit] () from /System/Library/Libraries/libgnustep-gui.so.0.26 #12 0xb7a58041 in -[NSApplication _init] () from /System/Library/Libraries/libgnustep-gui.so.0.26 #13 0xb7455232 in -[NSObject performSelector:withObject:] () from /System/Library/Libraries/libgnustep-base.so.1.25 #14 0xb74eb675 in -[NSObject(NSThreadPerformAdditions) performSelector:onThread:withObject:waitUntilDone:modes:] ()
   from /System/Library/Libraries/libgnustep-base.so.1.25
#15 0xb74eb2ec in -[NSObject(NSThreadPerformAdditions) performSelectorOnMainThread:withObject:waitUntilDone:modes:] ()
   from /System/Library/Libraries/libgnustep-base.so.1.25
#16 0xb74eb391 in -[NSObject(NSThreadPerformAdditions) performSelectorOnMainThread:withObject:waitUntilDone:] ()
   from /System/Library/Libraries/libgnustep-base.so.1.25
#17 0xb7a58420 in -[NSApplication init] () from /System/Library/Libraries/libgnustep-gui.so.0.26 #18 0xb7a57bbf in +[NSApplication sharedApplication] () from /System/Library/Libraries/libgnustep-gui.so.0.26 #19 0xb7a2c6f2 in NSApplicationMain () from /System/Library/Libraries/libgnustep-gui.so.0.26
#20 0x0804ab52 in main ()

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