Segmentation fault

[Dmole]

Sometimes shiftit will show the Spinning Beach Ball on mouseover of the icon after using a key command to move a window, then shiftit will quit. the key command will work after re-opening shift it.

Process: ShiftIt [63355]
Path: /Applications/ShiftIt.app/Contents/MacOS/ShiftIt
Identifier: org.shiftitapp.ShiftIt
Version: 1.6.3 (1.6.3)
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: ShiftIt [63355]
User ID: 501

Date/Time: 2015-11-23 09:46:37.752 -0500
OS Version: Mac OS X 10.10.5 (14F1021)
Report Version: 11
Anonymous UUID: 9B05D90F-8820-3005-3775-BA1FE637354D

Sleep/Wake UUID: 7D108531-EAD9-4618-B1AA-D6BED9EC41CA

Time Awake Since Boot: 2700000 seconds
Time Since Wake: 650000 seconds

Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: EXC_I386_GPFLT

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 org.shiftitapp.ShiftIt 0x000000010f41417a 63-[X11WindowDriver(WindowDelegate) getGeometry:ofWindow:error:]block_invoke + 54
1 org.shiftitapp.ShiftIt 0x000000010f414129 -[X11WindowDriver(WindowDelegate) getGeometry:ofWindow:error:] + 118
2 org.shiftitapp.ShiftIt 0x000000010f4130da -[X11Window getGeometry:screen:error:] + 78
3 org.shiftitapp.ShiftIt 0x000000010f423d15 -[AbstractWindowGeometryShiftItAction execute:error:] + 536
4 org.shiftitapp.ShiftIt 0x000000010f4194fe -[SIWindowManager executeAction:error:] + 228
5 org.shiftitapp.ShiftIt 0x000000010f417bcb -[ShiftItAppDelegate invokeShiftItActionByIdentifier:] + 510
6 org.shiftitapp.ShiftIt 0x000000010f41c44b hotKeyHandler + 177
7 com.apple.HIToolbox 0x00007fff8787fb6c DispatchEventToHandlers(EventTargetRec_, OpaqueEventRef_, HandlerCallRec_) + 1260
8 com.apple.HIToolbox 0x00007fff8787efae SendEventToEventTargetInternal(OpaqueEventRef_, OpaqueEventTargetRef_, HandlerCallRec_) + 386
9 com.apple.HIToolbox 0x00007fff8787ee22 SendEventToEventTargetWithOptions + 43
10 com.apple.HIToolbox 0x00007fff878bba9e ToolboxEventDispatcherHandler(OpaqueEventHandlerCallRef_, OpaqueEventRef_, void_) + 1762
11 com.apple.HIToolbox 0x00007fff87880295 DispatchEventToHandlers(EventTargetRec_, OpaqueEventRef_, HandlerCallRec_) + 3093
12 com.apple.HIToolbox 0x00007fff8787efae SendEventToEventTargetInternal(OpaqueEventRef_, OpaqueEventTargetRef_, HandlerCallRec*) + 386
13 com.apple.HIToolbox 0x00007fff87894cb6 SendEventToEventTarget + 40
14 com.apple.AppKit 0x00007fff88d4f082 -[NSApplication sendEvent:] + 2104
15 com.apple.AppKit 0x00007fff88c78b68 -[NSApplication run] + 711
16 com.apple.AppKit 0x00007fff88bf5244 NSApplicationMain + 1832
17 libdyld.dylib 0x00007fff8c1235c9 start + 1

[fikovnik]

Do you use any X11 apps?

[Dmole]

Yes, I sometimes use Inkscape, but I think X11 was not running at the time or that crash, only Terminal, Chrome, and Eclipse. I am not able to reproduce this issue while running Inkscape in X11. ShiftIt
will normally crash when the system is under load and I ask it to move a window.

[Dmole]

Today I was doing some really heavy disk IO so I tested again and was able to crash it 3 times, every time shift it erroneously opened X11. Only Terminal was running.

[fikovnik]

For me it is difficult to reproduce, but there is definitely a bug :-/ The thing is that the usability API is not have very high fidelity and sometimes it does not correctly report back the window handler. In that case ShiftIt, incorrectly, fall backs to X11.
I hope to have some time soon to fix this.

[Dmole]

Try using a HDD (not an SSD) and a disk testing tool to reproduce, I was using rdiff-backup and I could get it to crash quite reliably. .... maybe add an option to not try x11 and just give up if nothing is returned in a timely manner. OS X 10.x disk flush really sucks, there are many things that should not require blocking disk IO that do (like the volume button can lag up to 2 minutes if your disk is getting hammered.)

[cjcjameson]

Blocking 1.6.4 stable? I don't see a re-occurence of this from the past year +

[Dmole]

Oh I can reproduce it any time,
and accidentally do sometimes unintentionally.
Needs an option to skip X11 and give up gracefully.
Then again I might just go back to Linux where there are sane disk schedulers to select from.

[Dmole]

Still an issue in 1.6.6