Hello,
Building GNUstep from the latest source (last commit of libs-gui is Jul 28),
clicking to foreground a just-launched modal alert view app occasionally
crashes. The app tries to raise an exception and for some reason this is
triggering an abort.
The app is being compiled with ARC, libobjc2 1.9, on Aarch64.
Oddly, sometimes when running this test in lldb, upon clicking or alt-tabbing
to foreground the app instead of an abort I see that the process was “stopped
and restarted” with “thread 1 received signal: SIGCHLD” and the app continues
to run.
(1) Does anyone understand by libs-gui would be occasionally throwing this
exception in the first place? Could it be some kind of race condition?
(2) Why would the exception throwing result in an abort()? (Please see stack
trace below).
Thank you,
Patryk
(lldb) run
Process 11479 launched:
'/home/patryk/Desktop/gnustep-build/GUITest.app/GUITest' (aarch64)
Process 11479 stopped
* thread #1, name = 'GUITest', stop reason = signal SIGABRT
frame #0: 0x0000007fb65e5528 libc.so.6`gsignal + 56
libc.so.6`gsignal:
-> 0x7fb65e5528 <+56>: cmn x0, #0x1, lsl #12 ; =0x1000
0x7fb65e552c <+60>: b.hi 0x7fb65e5550 ; <+96>
0x7fb65e5530 <+64>: ret
0x7fb65e5534 <+68>: nop
(lldb) fr va
(lldb) up
frame #1: 0x0000007fb65e69e0 libc.so.6`abort + 432
libc.so.6`abort:
0x7fb65e69e0 <+432>: add x0, x19, #0x9d8 ; =0x9d8
0x7fb65e69e4 <+436>: ldr x1, [x0, #0x8]
0x7fb65e69e8 <+440>: cmp x20, x1
0x7fb65e69ec <+444>: b.eq 0x7fb65e6a20 ; <+496>
(lldb) up
frame #2: 0x0000007fb67bcc08
libobjc.so.4.6`objc_exception_throw(object=0x0000000000d3b808) at
eh_personality.c:188
185 _objc_unexpected_exception(object);
186 }
187 DEBUG_LOG("Throw returned %d\n",(int) err);
-> 188 abort();
189 }
190
191 static Class get_type_table_entry(struct _Unwind_Context *context,
(lldb) up
frame #3: 0x0000007fb6c53268 libgnustep-base.so.1.26`-[NSException
raise](self=0x0000000000d3b808, _cmd="\x85") at NSException.m:1513
1510 }
1511
1512 #if defined(_NATIVE_OBJC_EXCEPTIONS)
-> 1513 @throw self;
1514 #else
1515 {
1516 NSThread *thread;
(lldb) up
frame #4: 0x0000007fb77b8fd8 libgnustep-gui.so.0.27`-[NSApplication
runModalForWindow:](self=0x0000000000806d78, _cmd="z\x1c",
theWindow=0x0000000000aac598) at NSApplication.m:1808
1805 }
1806 if ([[localException name] isEqual: NSAbortModalException] == NO)
1807 {
-> 1808 [localException raise];
1809 }
1810 code = NSRunAbortedResponse;
1811 }
(lldb) up
frame #5: 0x0000007fb77985bc libgnustep-gui.so.0.27`-[NSAlert
runModal](self=0x00000000009d9ad8, _cmd="`\x1c") at NSAlert.m:2016
2013 else
2014 {
2015 [self _setupPanel];
-> 2016 [NSApp runModalForWindow: _window];
2017 [_window orderOut: self];
2018 _result = [(GSAlertPanel*)_window result];
2019 DESTROY(_window);
(lldb) up
frame #6: 0x0000000000401018 GUITest`main at guitest.m:11
8 NSAlert * alert = [[NSAlert alloc] init];
9 [alert setMessageText:@"Hello alert"];
10 [alert addButtonWithTitle:@"All done"];
-> 11 int result = [alert runModal];
12 if (result == NSAlertFirstButtonReturn) {
13 NSLog(@"First button pressed");
14 }
(lldb)
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