Mac OS crash (EXC_BAD_ACCESS)  #96

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1. michthom commented on Nov 5, 2016

   

   michthom

   on Nov 5, 2016

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   Version 3.0 (3.0~ea52fcbc) compiled from source with debug symbols.
2. whitequark

   added

   bug

   on Nov 5, 2016
3. whitequark commented on Nov 5, 2016

   

   whitequark

   on Nov 5, 2016

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   Please run SolveSpace under debugger and tell me the values of locals r and c at the moment of crash.
4. michthom commented on Nov 5, 2016

   

   michthom

   on Nov 5, 2016

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   This is the epitome of speedy service! I was running it under LLDB, so when it stopped I dumped the "thread backtrace all" above. Stupidly I didn't then write a core file to analyse. I'll try to reproduce it now.
5. michthom commented on Nov 5, 2016

   

   michthom

   on Nov 5, 2016

   Last edited by whitequark

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   Reproduced below, and saved a core file this time - but I'm clueless on how to display the locals you wanted, I tried (to no avail):

   (lldb) frame variable c
   (lldb) frame variable r
   (lldb) target variable c
   error: can't find global variable 'c'
   (lldb) target variable r
   error: can't find global variable 'r'
   (lldb) frame variable --no-args c
   (lldb) frame variable --no-args r
   
   `Process 7499 stopped
   * thread #1: tid = 0x44b9e9, 0x0000002000000020, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x2000000020)
       frame #0: 0x0000002000000020
   error: memory read failed for 0x2000000000
   (lldb) thread backtrace all
   * thread #1: tid = 0x44b9e9, 0x0000002000000020, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x2000000020)
     * frame #0: 0x0000002000000020
       frame #1: 0x000000010003e239 solvespace`SolveSpace::TextWindow::MouseEvent(this=0x0000000102800000, leftClick=false, leftDown=false, x=-1146.63671875, y=11.2109375) + 761 at textwin.cpp:1044
       frame #2: 0x000000010004b865 solvespace`::-[TextWindowView mouseMoved:](self=0x00000001015053d0, _cmd="mouseMoved:", event=0x00000001014a7750) + 293 at cocoamain.mm:921
       frame #3: 0x00007fff99b631e4 AppKit`-[NSTrackingArea mouseMoved:] + 152
       frame #4: 0x00007fff9a0e9bd1 AppKit`-[NSWindow _handleMouseMovedEvent:] + 266
       frame #5: 0x00007fff9a0eab15 AppKit`-[NSWindow _reallySendEvent:isDelayedEvent:] + 2108
       frame #6: 0x00007fff99b29539 AppKit`-[NSWindow sendEvent:] + 517
       frame #7: 0x00007fff99aa94db AppKit`-[NSApplication sendEvent:] + 1167
       frame #8: 0x00007fff99910df2 AppKit`-[NSApplication run] + 796
       frame #9: 0x000000010004ee6d solvespace`main(argc=1, argv=0x00007fff5fbffb08) + 429 at cocoamain.mm:1352
       frame #10: 0x00007fff914035ad libdyld.dylib`start + 1
       frame #11: 0x00007fff914035ad libdyld.dylib`start + 1
   
     thread #3: tid = 0x44ba04, 0x00007fff8d933efa libsystem_kernel.dylib`kevent_qos + 10, queue = 'com.apple.libdispatch-manager'
       frame #0: 0x00007fff8d933efa libsystem_kernel.dylib`kevent_qos + 10
       frame #1: 0x00007fff8ee6f165 libdispatch.dylib`_dispatch_mgr_invoke + 216
       frame #2: 0x00007fff8ee6edcd libdispatch.dylib`_dispatch_mgr_thread + 52
   
     thread #12: tid = 0x44ba24, 0x00007fff8d92cf72 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'com.apple.NSEventThread'
       frame #0: 0x00007fff8d92cf72 libsystem_kernel.dylib`mach_msg_trap + 10
       frame #1: 0x00007fff8d92c3b3 libsystem_kernel.dylib`mach_msg + 55
       frame #2: 0x00007fff884f2124 CoreFoundation`__CFRunLoopServiceMachPort + 212
       frame #3: 0x00007fff884f15ec CoreFoundation`__CFRunLoopRun + 1356
       frame #4: 0x00007fff884f0e38 CoreFoundation`CFRunLoopRunSpecific + 296
       frame #5: 0x00007fff99a72d95 AppKit`_NSEventThread + 149
       frame #6: 0x00007fff9b60c99d libsystem_pthread.dylib`_pthread_body + 131
       frame #7: 0x00007fff9b60c91a libsystem_pthread.dylib`_pthread_start + 168
       frame #8: 0x00007fff9b60a351 libsystem_pthread.dylib`thread_start + 13
   
     thread #33: tid = 0x44d232, 0x00007fff8d9335e2 libsystem_kernel.dylib`__workq_kernreturn + 10
       frame #0: 0x00007fff8d9335e2 libsystem_kernel.dylib`__workq_kernreturn + 10
       frame #1: 0x00007fff9b60c578 libsystem_pthread.dylib`_pthread_wqthread + 1283
       frame #2: 0x00007fff9b60a341 libsystem_pthread.dylib`start_wqthread + 13
   
6. whitequark commented on Nov 5, 2016

   

   whitequark

   on Nov 5, 2016

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   You need to go up one frame before asking lldb for this variable.
7. michthom commented on Nov 5, 2016

   

   michthom

   on Nov 5, 2016

   Last edited by whitequark

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   Got it ( at last! )

   $ lldb ~/Desktop/solvespace/build/src/solvespace.app/Contents/MacOS/solvespace -c /cores/2016-solvespace.core 
   (lldb) target create "/Users/michthom/Desktop/solvespace/build/src/solvespace.app/Contents/MacOS/solvespace" --core "/cores/2016-solvespace.core"
   Core file '/cores/2016-solvespace.core' (x86_64) was loaded.
   (lldb) bt all
   warning: could not load any Objective-C class information. This will significantly reduce the quality of type information available.
   * thread #1: tid = 0x0000, 0x0000002000000020, stop reason = signal SIGSTOP
     * frame #0: 0x0000002000000020
       frame #1: 0x000000010003e239 solvespace`SolveSpace::TextWindow::MouseEvent(this=0x0000000102800000, leftClick=false, leftDown=false, x=-1146.63671875, y=11.2109375) + 761 at textwin.cpp:1044
       frame #2: 0x000000010004b865 solvespace`::-[TextWindowView mouseMoved:](self=0x00000001015053d0, _cmd="mouseMoved:", event=0x00000001014a7750) + 293 at cocoamain.mm:921
       frame #3: 0x00007fff99b631e4 AppKit`-[NSTrackingArea mouseMoved:] + 152
       frame #4: 0x00007fff9a0e9bd1 AppKit`-[NSWindow _handleMouseMovedEvent:] + 266
       frame #5: 0x00007fff9a0eab15 AppKit`-[NSWindow _reallySendEvent:isDelayedEvent:] + 2108
       frame #6: 0x00007fff99b29539 AppKit`-[NSWindow sendEvent:] + 517
       frame #7: 0x00007fff99aa94db AppKit`-[NSApplication sendEvent:] + 1167
       frame #8: 0x00007fff99910df2 AppKit`-[NSApplication run] + 796
       frame #9: 0x000000010004ee6d solvespace`main(argc=1, argv=0x00007fff5fbffb08) + 429 at cocoamain.mm:1352
       frame #10: 0x00007fff914035ad libdyld.dylib`start + 1
       frame #11: 0x00007fff914035ad libdyld.dylib`start + 1
   
     thread #2: tid = 0x0001, 0x00007fff8d933efa libsystem_kernel.dylib`kevent_qos + 10, stop reason = signal SIGSTOP
       frame #0: 0x00007fff8d933efa libsystem_kernel.dylib`kevent_qos + 10
       frame #1: 0x00007fff8ee6f165 libdispatch.dylib`_dispatch_mgr_invoke + 216
       frame #2: 0x00007fff8ee6edcd libdispatch.dylib`_dispatch_mgr_thread + 52
   
     thread #3: tid = 0x0002, 0x00007fff8d92cf72 libsystem_kernel.dylib`mach_msg_trap + 10, stop reason = signal SIGSTOP
       frame #0: 0x00007fff8d92cf72 libsystem_kernel.dylib`mach_msg_trap + 10
       frame #1: 0x00007fff8d92c3b3 libsystem_kernel.dylib`mach_msg + 55
       frame #2: 0x00007fff884f2124 CoreFoundation`__CFRunLoopServiceMachPort + 212
       frame #3: 0x00007fff884f15ec CoreFoundation`__CFRunLoopRun + 1356
       frame #4: 0x00007fff884f0e38 CoreFoundation`CFRunLoopRunSpecific + 296
       frame #5: 0x00007fff99a72d95 AppKit`_NSEventThread + 149
       frame #6: 0x00007fff9b60c99d libsystem_pthread.dylib`_pthread_body + 131
       frame #7: 0x00007fff9b60c91a libsystem_pthread.dylib`_pthread_start + 168
       frame #8: 0x00007fff9b60a351 libsystem_pthread.dylib`thread_start + 13
   
     thread #4: tid = 0x0003, 0x00007fff8d9335e2 libsystem_kernel.dylib`__workq_kernreturn + 10, stop reason = signal SIGSTOP
       frame #0: 0x00007fff8d9335e2 libsystem_kernel.dylib`__workq_kernreturn + 10
       frame #1: 0x00007fff9b60c578 libsystem_pthread.dylib`_pthread_wqthread + 1283
       frame #2: 0x00007fff9b60a341 libsystem_pthread.dylib`start_wqthread + 13
   (lldb) frame select 1
   invalid command 'frame select'.
   (lldb) frame select 1
   frame #1: 0x000000010003e239 solvespace`SolveSpace::TextWindow::MouseEvent(this=0x0000000102800000, leftClick=false, leftDown=false, x=-1146.63671875, y=11.2109375) + 761 at textwin.cpp:1044
   

      1041             if(item.link) {
      1042                 SetMousePointerToHand(true);
      1043                 if(item.h) {
   -> 1044                     (item.h)(item.link, item.data);
      1045                 }
      1046             } else {
      1047                 SetMousePointerToHand(false);
   

   
   (lldb) frame variable c
   (int) c = -128
   (lldb) frame variable r
   (int) r = 0
   (lldb) frame variable item.h
   (LinkFunction *) item.h = 0x0000002000000020
   (lldb) frame variable item.link
   (int) item.link = 32
   (lldb) frame variable item.data
   (uint32_t) item.data = 32
   
   
8. whitequark commented on Nov 5, 2016

   

   whitequark

   on Nov 5, 2016

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   Ah yes... c = -128.

   👍React with 👍1Reacted by Michael Thomson

   😄React with 😄1Reacted by Jon Neal
9. whitequark commented on Nov 5, 2016

   

   whitequark

   on Nov 5, 2016

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   Fixed in master and 2.x.
10. whitequark

    closed this as completedon Nov 5, 2016
11. michthom commented on Nov 5, 2016

    

    michthom

    on Nov 5, 2016

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    I have no idea what your c=-128 comment actually meant, but as I read it I heard the line from Kung Fu Panda - "Ah, my old enemy... stairs." :-)
12. whitequark

    modified the milestone: 2.3 on Feb 17, 2017