Swift "Bus error: 10"

Is this a bug within Swift?

That’s always possible, but it’s unlikely. Most problems like this are caused by bugs in your code, or in framework code that you’re calling. Remember that, even though Swift is a safe language, you’re regularly call framework code that’s not safe.

Or how to catch the error?

This error is a machine exception (as opposed to a language exception) which makes it impossible to catch in the traditional sense.

Any suggestions about how to modify my code?

It’s hard to say without knowing more about the problem. If you post a symbolicated crash log (see TN2151 ), that might give us some hints.

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Hi Eskimo and thank you for the quick response.

There is no crash report (in /Users/***/Library/Logs/CrashReporter). I just get an "application has ended unexpectedly" pop-up. The error is intermittent, non-reproducible and typically occurs within timer event processing. (BTW: I see the "Bus error: 10" by running in Terminal window.)

When timer ticks, file's modify-date is checked (line 16). This is unchanged in crash scenario, so method readXML() is not invoked.

If file is inaccessible for any reason, method showActivity(...) is invoked to log error info. Its code begins on line 38.

If the application has been idle for a certain amount of time, method lock() is invoked. Its code begins on line 57.

Bus error 10 is associated with memory addressing errors, sometimes specifically with attempts to modify string literals. I just don't see where anything like that is happening within my Swift code.

func timerTick()
{
//did XML change?
var attributes : [FileAttributeKey : Any]
do
{
     attributes = try FileManager.default.attributesOfItem(atPath: path)
}//do
catch let error as NSError
{
     //XML file is unavailable; presumably temporarily
     showActivity(message: "timerTick: " + error.localizedDescription) // <<<THIS MAY BE TRUE
     return
}
let modDate = attributes[FileAttributeKey.modificationDate] as! NSDate
if  modDate != XMLasof // <<<THIS EVALUATES FALSE IN CRASH SCENARIO
{
     readXML()
     asOfDate.stringValue = "file as of " + XMLasof.description(withCalendarFormat: "%Y-%m-%d %H:%M", timeZone: nil, locale: nil)!
}
let idleTime = -lastActive.timeIntervalSinceNow
if  (window!.contentView! as NSView).isHidden { return }
switch autoLock
{
     case "5 minutes" :
          if  idleTime > ( 5 * 60)     { lock() }
     case "15 minutes" :
          if  idleTime > (15 * 60)     { lock() }
     case "1 hour" :
          if  idleTime > (60 * 60)     { lock() }
default :
     break
}//switch
}
 
 
//     WRITES message to STDOUT, optionally writes to a file with date/time stamp
func showActivity(message: String!)
{
     if  message == nil     { return }
     if  message == ""      { return }
     print(message)
     if  logPath == nil     { return }
     if  logPath == ""      { return }
     var output = FileHandle(forWritingAtPath: logPath)
     //FILE CREATE CODE OMITTED
     output?.seekToEndOfFile()
     let dateFormatter = DateFormatter()
     dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss: "
     let timestamp: String = dateFormatter.string(from: NSDate() as Date);
     output!.write(timestamp.data(using: String.Encoding.utf8, allowLossyConversion: false)!)
     output?.write(message.data(using: String.Encoding.utf8, allowLossyConversion: false)!)
     output?.write("\r\n".data(using: String.Encoding.utf8, allowLossyConversion: false)!)
     output?.closeFile()
}
 
func lock()
{
     if  preferences.isEnabled == false     { return }
     showActivity(message: "lock")
     preferences.isEnabled = false
     mainView.visible = false
     unlockKey.becomeFirstResponder()
     unlockView.visible = true
}

Tghis will probably not cause a bus error, but :

why on line 51 do you unwrap and not on the following ?

1. output!.write(timestamp.data(using: String.Encoding.utf8, allowLossyConversion: false)!)
2. output?.write(message.data(using: String.Encoding.utf8, allowLossyConversion: false)!)
3. output?.write("\r\n".data(using: String.Encoding.utf8, allowLossyConversion: false)!)
4. output?.closeFile()

>Any suggestions

Are you by any chance trying to access something that has been purposely/previously deallocated by you?

> ...about how to modify my code?

Using a support ticket w/DTS would allow you to furnish a project that examples your issue, as opposed to doing a full dump here...ouch 😉

A couple of things:

— A bus error crash is kinda old-school. I mean it's a fairly low-level crash (dereferencing invalid pointers usually produces a more controlled, or at least better reported, crash), and that may indicate it's happening in (say) a sensitive section of the kernel. If your problem wasn't happening on multiple Macs, I'd begin to suspect a hardware fault.

— A crash that happens after a period of time may indicate that a critical resource is being leaked. In your case, you're creating FileHandle objects after inactivity, and those objects (by default) need a low-level Unix file descriptor, which is an extremely scarce resource. (On a modern Mac, you can only have about 8,000 file descriptors at one time, which isn't many if you start to forget to release them.) It's not impossible there's a resource-handling bug in your code or one of the frameworks APIs that you call, that results in your file descriptors not being released. IIRC, you can run Instruments on your app, and by choosing a suitable instrument you might be able to see an unreleased resource accumulating over time.

— Even if the above can be ruled out, I'd encourage you to think a bit more laterally. The bus error may not be the primary error, only a secondary consequence. Maybe there are other things going wrong too, and they only seem less important.

— If the "lock" function is ever called on a background thread, it's going to be bad news for your app. It's worth checking that everything that requires the main thread (the first and last functions in your fragment, at least) is being called on the main thread.

— Is this the debug version of your app that's crashing, or the release version? Note that in pure Swift code, it's possible that the text of some run-time error messages may be suppressed in the optimized release version.

— Are you running from Xcode or freestanding? If you're running from Xcode, you should be able to get some clues by looking at the backtrace at the time of the crash — although not necessarily, if your app is a long way past the point of the original error when it crashes. Even the fact that it does not crash when run from Xcode (if that's the case) is a small clue.

QuinceyMorris wrote:

A bus error crash is kinda old-school. I mean it's a fairly low-level crash (dereferencing invalid pointers usually produces a more controlled, or at least better reported, crash), and that may indicate it's happening in (say) a sensitive section of the kernel. If your problem wasn't happening on multiple Macs, I'd begin to suspect a hardware fault.

That is, IMO, quite misleading. Let’s break this down:

This message:

$ ./MyTestTool
Segmentation fault: 11

means that your program has died due to an unhandled

SIGSEGV

signal. In contrast, this message:

$ ./MyTestTool
Bus error: 10

means that your program has died due to an unhandled

SIGBUS

signal.

The difference between

SIGSEGV

and

SIGBUS

is a subtle one. In the general case there’s very little difference; they both mean that the CPU has taken a memory access exception (this is a machine exception, unrelated to language exceptions like you see in Objective-C, C++ and, if you squint, Swift), and the actual signal you get is both OS and hardware related.

However, on Apple platforms the difference is actually pretty clear. You get a

SIGSEGV

when you access unmapped memory and you get a

SIGBUS

when you access memory that’s mapped but whose protection isn’t compatible with your access. For example, this code:

int main(int argc, const char * argv[]) {
    * (int *) 12345 += 1;
    return 0;
}

generates a

SIGSEGV

while this code:

#include <sys/mman.h>
#include <stdlib.h>
 
int main(int argc, const char * argv[]) {
    void * m = valloc(16);
    (void) mprotect(m, 16, PROT_READ);
    * (int *) m += 1;
    return 0;
}

generates a

SIGBUS

.

Note Two things:

• I’m using C because it’s easy to get C to crash (-:

• The above is a simplification. There are, for example, cases where the kernel turns what would be a

  SIGBUS

  into a

  SIGSEGV

  (like overflowing your stack). However, it’s good enough for this discussion.

pf1019 wrote:

There is no crash report (in

/Users/***/Library/Logs/CrashReporter

).

That’s not the right place to look for a crash that originated on your Mac. You should, instead, look in

/Users/***/Library/Logs/DiagnosticReports/

. On my machine it contains plenty of crash logs generated while I tested the above code, and one of those clearly shows the

SIGBUS

.

$ ls /Users/quinn/Library/Logs/DiagnosticReports
…
MyTestTool_2017-01-19-094352_Sully.crash
MyTestTool_2017-01-19-094459_Sully.crash
MyTestTool_2017-01-19-094840_Sully.crash
MyTestTool_2017-01-19-095539_Sully.crash
MyTestTool_2017-01-19-095938_Sully.crash
MyTestTool_2017-01-19-100102_Sully.crash
…
$ head -n 26 /Users/quinn/Library/Logs/DiagnosticReports/MyTestTool_2017-01-19-095938_Sully.crash
Process:              MyTestTool [25442]
Path:                  /Users/USER/Desktop/*/MyTestTool
Identifier:            MyTestTool
Version:              0
Code Type:            X86-64 (Native)
Parent Process:        bash [25292]
Responsible:          MyTestTool [25442]
User ID:              2000
 
Date/Time:            2017-01-19 09:59:37.961 +0000
OS Version:            Mac OS X 10.12.2 (16C67)
Report Version:        12
Anonymous UUID:        B9B7800F-9CC9-88EA-6DDE-8CF9BA759AB9
 
Sleep/Wake UUID:      FA8CA4EA-6A88-4F7B-9208-A8B7B5ABC575
 
Time Awake Since Boot: 150000 seconds
Time Since Wake:      5700 seconds
 
System Integrity Protection: enabled
 
Crashed Thread:        0  Dispatch queue: com.apple.main-thread
 
Exception Type:        EXC_BAD_ACCESS (SIGBUS)
Exception Codes:      KERN_PROTECTION_FAILURE at 0x00007fa372003000
Exception Note:        EXC_CORPSE_NOTIFY
$

Please grab an example crash log and post that. Without that we’re all just thrashing around in the dark.

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

I noticed that too when I copy/pasted. I was probably tinkering with the unwrap/optional syntax and left it inconsistent. I haven't quite mastered when/how to use that notation with greatest clarity.

Look in the right place!

Here is a Crash Report for one of the Bus error: 10 incidents. I cannot figure out how to symbolicate it. Instructions say add it to XCODE organizer, but that doesn't seem to do anything. I have DSYM file and all the other Derived files. I tried to use (unfamiliar, to me) ATOS tool but no joy.

Line 42 of stack reports timer callback.

Line 41 then reports ??? which must be my timerTick function. That is top of call stack so error must be within that method.

If that is correct analysis, the problem must be with a line entirely within that method.

Am I getting closer?

Process:               Recipes [8505]
Path:                  /Volumes//Recipes.app/Contents/MacOS/Recipes
Identifier:            PhilFenster.Recipes
Version:               1.2 (1)
Code Type:             X86-64 (Native)
Parent Process:        ??? [1]
Responsible:           Recipes [8505]
User ID:               501
 
 
Date/Time:             2017-01-18 00:44:31.510 -0500
OS Version:            Mac OS X 10.11.6 (15G1212)
Report Version:        11
Anonymous UUID:        B27D61EC-2341-818F-E544-8F6B6631DDDA
 
 
Sleep/Wake UUID:       FC2D7386-8DD9-44EA-AB06-40861D6D31FD
 
 
Time Awake Since Boot: 190000 seconds
Time Since Wake:       9 seconds
 
 
System Integrity Protection: enabled
 
 
Crashed Thread:        0  Dispatch queue: com.apple.main-thread
 
 
Exception Type:        EXC_BAD_ACCESS (SIGBUS)
Exception Codes:       0x000000000000000a, 0x000000010bebbb70
Exception Note:        EXC_CORPSE_NOTIFY
 
 
VM Regions Near 0x10bebbb70:
--> mapped file            000000010be83000-000000010bee2000 [  380K] r-x/rwx SM=COW 
    mapped file            000000010bee2000-000000010beee000 [   48K] rw-/rwx SM=COW 
 
 
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   ???                           0x000000010bebbb70 0 + 4494965616
1   com.apple.CoreFoundation       0x00007fff9981daf4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
2   com.apple.CoreFoundation       0x00007fff9981d783 __CFRunLoopDoTimer + 1075
3   com.apple.CoreFoundation       0x00007fff9981d2da __CFRunLoopDoTimers + 298
4   com.apple.CoreFoundation       0x00007fff998147d1 __CFRunLoopRun + 1841
5   com.apple.CoreFoundation       0x00007fff99813e38 CFRunLoopRunSpecific + 296
6   com.apple.HIToolbox           0x00007fff8c768935 RunCurrentEventLoopInMode + 235
7   com.apple.HIToolbox           0x00007fff8c76876f ReceiveNextEventCommon + 432
8   com.apple.HIToolbox           0x00007fff8c7685af _BlockUntilNextEventMatchingListInModeWithFilter + 71
9   com.apple.AppKit               0x00007fff9bcd4df6 _DPSNextEvent + 1067
10  com.apple.AppKit               0x00007fff9bcd4226 -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 454
11  com.apple.AppKit               0x00007fff9bcc8d80 -[NSApplication run] + 682
12  com.apple.AppKit               0x00007fff9bc92368 NSApplicationMain + 1176
13  ???                           0x000000010be856c9 0 + 4494743241
14  libdyld.dylib                 0x00007fff90a7d5ad start + 1
 
 
Thread 1:: Dispatch queue: com.apple.libdispatch-manager
0   libsystem_kernel.dylib         0x00007fff9dedeefa kevent_qos + 10
1   libdispatch.dylib             0x00007fff9b172165 _dispatch_mgr_invoke + 216
2   libdispatch.dylib             0x00007fff9b171dcd _dispatch_mgr_thread + 52
 
 
Thread 2:: com.apple.NSEventThread
0   libsystem_kernel.dylib         0x00007fff9ded7f72 mach_msg_trap + 10
1   libsystem_kernel.dylib         0x00007fff9ded73b3 mach_msg + 55
2   com.apple.CoreFoundation       0x00007fff99815124 __CFRunLoopServiceMachPort + 212
3   com.apple.CoreFoundation       0x00007fff998145ec __CFRunLoopRun + 1356
4   com.apple.CoreFoundation       0x00007fff99813e38 CFRunLoopRunSpecific + 296
5   com.apple.AppKit               0x00007fff9be2ad95 _NSEventThread + 149
6   libsystem_pthread.dylib       0x00007fff96ac599d _pthread_body + 131
7   libsystem_pthread.dylib       0x00007fff96ac591a _pthread_start + 168
8   libsystem_pthread.dylib       0x00007fff96ac3351 thread_start + 13
 
 
Thread 3:
0   libsystem_kernel.dylib         0x00007fff9dede5e2 __workq_kernreturn + 10
1   libsystem_pthread.dylib       0x00007fff96ac5578 _pthread_wqthread + 1283
2   libsystem_pthread.dylib       0x00007fff96ac3341 start_wqthread + 13
 
 
Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x00007ffee8d79520  rbx: 0x00007ffee8d79520  rcx: 0x0100000000000000  rdx: 0x00007ffee8cf3da0
  rdi: 0x00007ffee8d79520  rsi: 0x000000010bedf09f  rbp: 0x00007fff53d7a4a0  rsp: 0x00007fff53d7a458
   r8: 0x0000000000000040   r9: 0x00007ffee8d147c8  r10: 0x00007ffeea80b7f0  r11: 0x000000010beec040
  r12: 0x00007fff94a494c0  r13: 0x00007ffee8cf3da0  r14: 0x00007ffee9804040  r15: 0x00007ffee8cf3da0
  rip: 0x000000010bebbb70  rfl: 0x0000000000010246  cr2: 0x000000010bebbb70
 
Logical CPU:     2
Error Code:      0x00000014
Trap Number:     14
 
 
 
 
Binary Images:
                 0 - 0xffffffffffffffff +Recipes (???) /Volumes//Recipes.app/Contents/MacOS/Recipes
                 0 - 0xffffffffffffffff +libswiftAppKit.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftAppKit.dylib
                 0 - 0xffffffffffffffff +libswiftCore.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftCore.dylib
                 0 - 0xffffffffffffffff +libswiftCoreData.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftCoreData.dylib
                 0 - 0xffffffffffffffff +libswiftCoreGraphics.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftCoreGraphics.dylib
                 0 - 0xffffffffffffffff +libswiftCoreImage.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftCoreImage.dylib
                 0 - 0xffffffffffffffff +libswiftDarwin.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftDarwin.dylib
                 0 - 0xffffffffffffffff +libswiftDispatch.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftDispatch.dylib
                 0 - 0xffffffffffffffff +libswiftFoundation.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftFoundation.dylib
                 0 - 0xffffffffffffffff +libswiftIOKit.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftIOKit.dylib
                 0 - 0xffffffffffffffff +libswiftObjectiveC.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftObjectiveC.dylib
                 0 - 0xffffffffffffffff +libswiftQuartzCore.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftQuartzCore.dylib
                 0 - 0xffffffffffffffff +libswiftXPC.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftXPC.dylib
       0x10fbe0000 -        0x10fbe2fff  libCGXType.A.dylib (960.7) <F52CB9D5-B366-3A93-B1E6-81B583675B19> /System/Library/Frameworks/CoreGraphics.framework/Versions/A/Resources/libCGXType.A.dylib
       0x1101ae000 -        0x1101d7ffb  libRIP.A.dylib (960.7) <6C9E6C2C-62FD-32E6-AEB8-564A3510B17A> /System/Library/Frameworks/CoreGraphics.framework/Versions/A/Resources/libRIP.A.dylib
       0x110739000 -        0x110739ff7 +cl_kernels (???) <3957EF62-0304-4CD1-86CE-88F78EBB0091> cl_kernels
    0x7fff60933000 -     0x7fff6096aa47  dyld (360.22) <884763FC-CC0F-31CC-ACC4-75A805CE401D> /usr/lib/dyld
    0x7fff89b02000 -     0x7fff89b03fff  libsystem_blocks.dylib (65) <1244D9D5-F6AA-35BB-B307-86851C24B8E5> /usr/lib/system/libsystem_blocks.dylib
    0x7fff89c8a000 -     0x7fff89c92fff  libGFXShared.dylib (12.1) <FFB3BBDE-0AE4-3570-B9F4-1BC093F8777A> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGFXShared.dylib
    0x7fff89c9c000 -     0x7fff89cc3fff  com.apple.ChunkingLibrary (167 - 167) <AD7F285C-005E-36BB-98A3-5826413533BE> /System/Library/PrivateFrameworks/ChunkingLibrary.framework/Versions/A/ChunkingLibrary
    0x7fff89d25000 -     0x7fff89d55ff3  com.apple.CoreAVCHD (5.8.0 - 5800.4.2) <4AAFB1C4-3708-30F9-ACFA-90564347204C> /System/Library/PrivateFrameworks/CoreAVCHD.framework/Versions/A/CoreAVCHD
    0x7fff8a182000 -     0x7fff8a18dfff  com.apple.CrashReporterSupport (10.11 - 718) <05892B57-F2CD-3C84-B984-0417F6B361DB> /System/Library/PrivateFrameworks/CrashReporterSupport.framework/Versions/A/CrashReporterSupport
    0x7fff8a199000 -     0x7fff8a1f7fff  com.apple.CoreServices.OSServices (728.13 - 728.13) <27C12B92-7845-38DD-B82D-DC5B678352D6> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/OSServices.framework/Versions/A/OSServices
    0x7fff8a546000 -     0x7fff8a55dff7  libsystem_asl.dylib (323.50.1) <41F8E11F-1BD0-3F1D-BA3A-AA1577ED98A9> /usr/lib/system/libsystem_asl.dylib
    0x7fff8a704000 -     0x7fff8a752fff  libcurl.4.dylib (90) <12E01E4B-24C9-394C-9D2C-85CF85D5F459> /usr/lib/libcurl.4.dylib
    0x7fff8a770000 -     0x7fff8b859ff3  com.apple.WebCore (11601 - 11601.7.5) <9153DA7E-1625-382A-8257-8D4293F06F7F> /System/Library/Frameworks/WebKit.framework/Versions/A/Frameworks/WebCore.framework/Versions/A/WebCore
    0x7fff8b90f000 -     0x7fff8b910fff  liblangid.dylib (122) <9CC4F0D1-5C51-3B69-BC8F-EE3A51FD0822> /usr/lib/liblangid.dylib
    0x7fff8b927000 -     0x7fff8b935fff  com.apple.opengl (12.1.0 - 12.1.0) <62997B59-BCD2-3A71-BD16-DE75DBAFA7C2> /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL
    0x7fff8b967000 -     0x7fff8b96afff  com.apple.IOSurface (108.2.3 - 108.2.3) <52E51D16-42E9-3DDB-A16C-48225EF262C4> /System/Library/Frameworks/IOSurface.framework/Versions/A/IOSurface
    0x7fff8b9c8000 -     0x7fff8ba0dff7  com.apple.coreservices.SharedFileList (24.4 - 24.5) <1D2AD77B-778F-3253-A295-3D0A32A8121C> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/SharedFileList.framework/Versions/A/SharedFileList
    0x7fff8ba26000 -     0x7fff8ba26ff7  liblaunch.dylib (765.50.8) <834ED605-5114-3641-AA4D-ECF31B801C50> /usr/lib/system/liblaunch.dylib
    0x7fff8ba27000 -     0x7fff8ba37fff  libbsm.0.dylib (34) <7E14504C-A8B0-3574-B6EB-5D5FABC72926> /usr/lib/libbsm.0.dylib
    0x7fff8c362000 -     0x7fff8c43bfff  com.apple.CoreMedia (1.0 - 1731.15.207) <70CAD4A7-3F8B-3767-A420-98BE1062C230> /System/Library/Frameworks/CoreMedia.framework/Versions/A/CoreMedia
    0x7fff8c43c000 -     0x7fff8c45bff7  com.apple.framework.Apple80211 (11.0 - 1121.34.2) <90477FAE-B835-3931-80FB-FDFF02B21D9D> /System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Apple80211
    0x7fff8c515000 -     0x7fff8c51aff3  libunwind.dylib (35.3) <F6EB48E5-4D12-359A-AB54-C937FBBE9043> /usr/lib/system/libunwind.dylib
    0x7fff8c51b000 -     0x7fff8c524ff7  com.apple.CommonAuth (4.0 - 2.0) <4B8673E1-3697-3FE2-8D30-AC7AC5D4F8BF> /System/Library/PrivateFrameworks/CommonAuth.framework/Versions/A/CommonAuth
    0x7fff8c525000 -     0x7fff8c526ffb  libremovefile.dylib (41) <552EF39E-14D7-363E-9059-4565AC2F894E> /usr/lib/system/libremovefile.dylib
    0x7fff8c5cd000 -     0x7fff8c5d9fff  com.apple.SpeechRecognitionCore (2.2.7 - 2.2.7) <6BA06290-D4A3-351C-87F9-B61EF61FF055> /System/Library/PrivateFrameworks/SpeechRecognitionCore.framework/Versions/A/SpeechRecognitionCore
    0x7fff8c5da000 -     0x7fff8c5e5ff7  libChineseTokenizer.dylib (16) <79B8C67A-3061-3C78-92CD-4650719E68D4> /usr/lib/libChineseTokenizer.dylib
    0x7fff8c63c000 -     0x7fff8c68cff7  com.apple.Symbolication (1.4 - 58044) <F70BF765-FBE9-3F1E-85CA-BB2F8E53E8C2> /System/Library/PrivateFrameworks/Symbolication.framework/Versions/A/Symbolication
    0x7fff8c68d000 -     0x7fff8c6c4ff7  com.apple.LDAPFramework (2.4.28 - 194.5) <9AE33BF2-FB17-342D-8F1E-5F83C6E6EB69> /System/Library/Frameworks/LDAP.framework/Versions/A/LDAP
    0x7fff8c6c5000 -     0x7fff8c6e9fff  com.apple.quartzfilters (1.10.0 - 1.10.0) <F5C482E2-5AFB-3959-8C01-C149D48E7583> /System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/QuartzFilters.framework/Versions/A/QuartzFilters
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    0x7fff9bc8b000 -     0x7fff9bc8bfff  com.apple.Accelerate (1.10 - Accelerate 1.10) <5831771A-C1C3-3625-9FE9-2CCB6B2E7EE1> /System/Library/Frameworks/Accelerate.framework/Versions/A/Accelerate
    0x7fff9bc8c000 -     0x7fff9c8b5ff7  com.apple.AppKit (6.9 - 1404.47) <F3411F6E-DD87-34D0-8C68-C69B2205E41D> /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
    0x7fff9c8b6000 -     0x7fff9c8d1fff  com.apple.aps.framework (4.0 - 4.0) <CAD47B6E-A581-3B35-885B-67B206F41D5E> /System/Library/PrivateFrameworks/ApplePushService.framework/Versions/A/ApplePushService
    0x7fff9cc46000 -     0x7fff9cc75ff7  com.apple.DictionaryServices (1.2 - 250.3) <30250542-CBAA-39C1-91AA-B57A5DE17594> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/DictionaryServices.framework/Versions/A/DictionaryServices
    0x7fff9cc92000 -     0x7fff9cf77ffb  com.apple.CoreServices.CarbonCore (1136.2 - 1136.2) <2DBAFC9A-6CD6-351D-B1F4-87D81AA6D640> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/CarbonCore.framework/Versions/A/CarbonCore
    0x7fff9d10b000 -     0x7fff9d119fff  libxar.1.dylib (302) <03207F66-2C4A-3DBD-8D81-70F4C85903C4> /usr/lib/libxar.1.dylib
    0x7fff9d1d8000 -     0x7fff9d243ff7  com.apple.framework.CoreWLAN (11.0 - 1101.20) <3B35C543-7FCE-333F-80C1-432FA41DDCDE> /System/Library/Frameworks/CoreWLAN.framework/Versions/A/CoreWLAN
    0x7fff9d581000 -     0x7fff9d63aff7  com.apple.cloudkit.CloudKit (482.29 - 482.29) <E235B37E-1491-3857-BDE8-38450D4FE8D0> /System/Library/Frameworks/CloudKit.framework/Versions/A/CloudKit
    0x7fff9d63b000 -     0x7fff9d63dff7  com.apple.xpc.ServiceManagement (1.0 - 1) <D96D7A6D-EDEB-35EE-B5D9-E33A3BF011B5> /System/Library/Frameworks/ServiceManagement.framework/Versions/A/ServiceManagement
    0x7fff9d63e000 -     0x7fff9d63efff  libmetal_timestamp.dylib (600.0.44.2) <DEEA1127-7A5D-3EF2-A4B2-AE125CBA5DB5> /System/Library/PrivateFrameworks/GPUCompiler.framework/libmetal_timestamp.dylib
    0x7fff9d63f000 -     0x7fff9da41fff  libLAPACK.dylib (1162.2) <42238ED4-6B7A-39D0-BFF2-304A0C287213> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLAPACK.dylib
    0x7fff9da5a000 -     0x7fff9da7cff7  com.apple.Sharing (442.13.6 - 442.13.6) <DDD2811C-6ECB-32F2-8EE1-69BF9657B4A8> /System/Library/PrivateFrameworks/Sharing.framework/Versions/A/Sharing
    0x7fff9dace000 -     0x7fff9db2cfff  com.apple.SystemConfiguration (1.14 - 1.14) <8886E043-B668-3A49-BCA5-F89FB0ECB6EC> /System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfiguration
    0x7fff9db2d000 -     0x7fff9dd3afff  libicucore.A.dylib (551.51.4) <3899B146-3840-3D4A-8C4A-FE391D5D25C7> /usr/lib/libicucore.A.dylib
    0x7fff9de02000 -     0x7fff9debcfff  com.apple.DiscRecording (9.0.1 - 9010.4.3) <540853B2-B123-3560-8023-C92EE229051A> /System/Library/Frameworks/DiscRecording.framework/Versions/A/DiscRecording
    0x7fff9debd000 -     0x7fff9debdff7  libunc.dylib (29) <DDB1E947-C775-33B8-B461-63E5EB698F0E> /usr/lib/system/libunc.dylib
    0x7fff9debe000 -     0x7fff9dec6fff  com.apple.NetFS (6.0 - 4.0) <842A5346-24C3-3F22-9ECF-E586A10EA1F2> /System/Library/Frameworks/NetFS.framework/Versions/A/NetFS
    0x7fff9dec7000 -     0x7fff9dee5ff7  libsystem_kernel.dylib (3248.60.11.1.2) <1CC38FFB-EB7B-340D-AC32-27580A15AC0A> /usr/lib/system/libsystem_kernel.dylib
    0x7fff9df11000 -     0x7fff9df16ff7  libmacho.dylib (875.1) <318264FA-58F1-39D8-8285-1F6254EE410E> /usr/lib/system/libmacho.dylib
    0x7fff9df32000 -     0x7fff9df5dff7  com.apple.AddressBook.ContactsFoundation (8.0 - 2137.1) <BAE70E9D-BCC8-3650-B554-6D646388EDEF> /System/Library/PrivateFrameworks/ContactsFoundation.framework/Versions/A/ContactsFoundation
    0x7fff9df5e000 -     0x7fff9df6ffff  libcmph.dylib (6) <BA4BF2C6-7F4E-33B8-9DD7-619C9EB83ECF> /usr/lib/libcmph.dylib
    0x7fff9e02b000 -     0x7fff9e033fff  com.apple.frameworks.CoreDaemon (1.3 - 1.3) <CC53DC12-9231-3C4F-921B-9A770D463323> /System/Library/PrivateFrameworks/CoreDaemon.framework/Versions/B/CoreDaemon
    0x7fff9e034000 -     0x7fff9e2cafff  libmecabra.dylib (696.5) <EF6C0BD4-5FE8-34FB-8ADF-69A53CEC97A9> /usr/lib/libmecabra.dylib
    0x7fff9e2cb000 -     0x7fff9e2ceff7  com.apple.AppleSystemInfo (3.1.5 - 3.1.5) <6932B5EC-0EA9-333D-BF7E-665047392FEC> /System/Library/PrivateFrameworks/AppleSystemInfo.framework/Versions/A/AppleSystemInfo
    0x7fff9e301000 -     0x7fff9e522ff7  com.apple.CoreImage (11.4.0 - 366.4.20) <7721BA55-A10E-3425-8392-C5D7C510EAAB> /System/Library/Frameworks/CoreImage.framework/Versions/A/CoreImage
    0x7fff9e523000 -     0x7fff9e528fff  com.apple.ImageCapture (9.0 - 9.0) <ACECF0B7-7D92-3A22-BF47-E8FADF4C5378> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/ImageCapture.framework/Versions/A/ImageCapture
    0x7fff9e529000 -     0x7fff9e532fff  com.apple.icloud.FindMyDevice (1.0 - 1) <B9C741F2-6FAC-3BA7-B6E0-9A910C6E8D4E> /System/Library/PrivateFrameworks/FindMyDevice.framework/Versions/A/FindMyDevice
    0x7fff9e543000 -     0x7fff9e558fff  com.apple.ToneKit (1.0 - 1) <6D5AD263-308F-3F70-8D86-7027569D2694> /System/Library/PrivateFrameworks/ToneKit.framework/Versions/A/ToneKit
    0x7fff9e559000 -     0x7fff9e559fff  com.apple.audio.units.AudioUnit (1.13 - 1.13) <378B5292-F216-32AB-B628-8C33A72D7052> /System/Library/Frameworks/AudioUnit.framework/Versions/A/AudioUnit
    0x7fff9e565000 -     0x7fff9e5d9ff3  com.apple.securityfoundation (6.0 - 55126) <DAA4FDD0-7F84-30AA-BE6F-96BB9F871F07> /System/Library/Frameworks/SecurityFoundation.framework/Versions/A/SecurityFoundation
    0x7fff9e5da000 -     0x7fff9e61fff3  libFontRegistry.dylib (155.2) <A70DD497-35F3-34DA-9C19-F4B90080E961> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libFontRegistry.dylib
    0x7fff9e620000 -     0x7fff9e631ff7  libsystem_trace.dylib (201.10.3) <E9311C03-9E61-3B13-AF3F-A64956FFF269> /usr/lib/system/libsystem_trace.dylib
    0x7fff9e691000 -     0x7fff9e78dff7  libFontParser.dylib (158.6) <267A9AE4-4138-3112-8D73-BDFDC96568FF> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libFontParser.dylib
    0x7fff9e78e000 -     0x7fff9e7a8fff  com.apple.Kerberos (3.0 - 1) <1B4744BF-E5AE-38E2-AA56-E22D3270F2E8> /System/Library/Frameworks/Kerberos.framework/Versions/A/Kerberos
    0x7fff9e7ac000 -     0x7fff9e7baff7  libbz2.1.0.dylib (38) <28E54258-C0FE-38D4-AB76-1734CACCB344> /usr/lib/libbz2.1.0.dylib
    0x7fff9e828000 -     0x7fff9e829ff3  com.apple.print.framework.Print (10.0 - 266) <3E85F70C-D7D4-34E1-B88A-C1F503F99CDA> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Print.framework/Versions/A/Print
    0x7fff9e82a000 -     0x7fff9e82dfff  libsystem_sandbox.dylib (460.60.2) <2A68B39C-B786-3A05-87A2-56E688469FB8> /usr/lib/system/libsystem_sandbox.dylib
    0x7fff9e983000 -     0x7fff9e9a8ff7  libPng.dylib (1460) <2A9174D0-445A-3AD9-8141-D602E9A1D735> /System/Library/Frameworks/ImageIO.framework/Versions/A/Resources/libPng.dylib
    0x7fff9e9a9000 -     0x7fff9e9fbfff  com.apple.AppleVAFramework (5.0.32 - 5.0.32) <B177135E-C16A-3296-99C9-CDA0E8E2A855> /System/Library/PrivateFrameworks/AppleVA.framework/Versions/A/AppleVA
    0x7fff9eadb000 -     0x7fff9ee59ff3  com.apple.************ (1.0 - 1731.15.207) <6C7C261F-CB65-3AF1-92E7-16ACAD371EF4> /System/Library/Frameworks/************.framework/Versions/A/************
    0x7fff9f2c7000 -     0x7fff9f534fff  com.apple.imageKit (2.6 - 932) <FAE317B8-DF15-3096-AFAC-464913BF2F3B> /System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/ImageKit.framework/Versions/A/ImageKit
    0x7fff9f535000 -     0x7fff9f537fff  libsystem_coreservices.dylib (19.2) <1B3F5AFC-FFCD-3ECB-8B9A-5538366FB20D> /usr/lib/system/libsystem_coreservices.dylib
    0x7fff9f538000 -     0x7fff9f9d3ffb  com.apple.GeoServices (1.0 - 1151.49.1) <2D887517-B73D-30FF-91DC-AF6AD91F96B9> /System/Library/PrivateFrameworks/GeoServices.framework/Versions/A/GeoServices
    0x7fff9f9d4000 -     0x7fff9fab4ff7  unorm8_rgba.dylib (2.7.3) <9EB6C346-CFF6-32D7-B4A1-2409DFBCB216> /System/Library/Frameworks/OpenCL.framework/Versions/A/Libraries/ImageFormats/unorm8_rgba.dylib
    0x7fff9facd000 -     0x7fff9fb30fff  libAVFAudio.dylib (161.2) <1A98DBF3-490B-37FB-928A-AB1E36E6E5DD> /System/Library/Frameworks/AVFoundation.framework/Versions/A/Resources/libAVFAudio.dylib
    0x7fff9fba8000 -     0x7fff9fbafff7  libcompiler_rt.dylib (62) <A13ECF69-F59F-38AE-8609-7B731450FBCD> /usr/lib/system/libcompiler_rt.dylib
    0x7fff9fcde000 -     0x7fff9fd33fff  com.apple.AE (701 - 701) <AD492742-F884-386B-A450-FAC281B9FFA4> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/AE.framework/Versions/A/AE
    0x7fff9fd34000 -     0x7fff9fd34fff  com.apple.quartzframework (1.5 - 21) <5DC3D0D9-9E3F-3AA5-92F1-F229907A49B9> /System/Library/Frameworks/Quartz.framework/Versions/A/Quartz
    0x7fff9fdad000 -     0x7fff9fdfeff7  libcups.2.dylib (435.2) <91584A40-214D-33E8-A613-CE22289037C8> /usr/lib/libcups.2.dylib
    0x7fff9fdff000 -     0x7fff9fe01ff7  com.apple.securityhi (9.0 - 55006) <1E7BE52B-97EA-371A-AECA-1EE2AD246D8A> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/SecurityHI.framework/Versions/A/SecurityHI
    0x7fff9fe60000 -     0x7fff9feacff7  com.apple.corelocation (1486.17 - 1615.38) <6336CFC5-9D7D-3B76-B263-56DD6EBD0B8D> /System/Library/Frameworks/CoreLocation.framework/Versions/A/CoreLocation
    0x7fff9fead000 -     0x7fff9feb3fff  com.apple.XPCService (2.0 - 1) <5E2122D6-FFA2-3552-BF16-9FD3F36B40DB> /System/Library/PrivateFrameworks/XPCService.framework/Versions/A/XPCService
    0x7fff9feb7000 -     0x7fffa0375fcf  com.apple.vImage (8.0 - 8.0) <85FB412E-EB30-3433-A79B-B3970FC83580> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vImage.framework/Versions/A/vImage
 
 
External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 4373
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 11947801
    thread_create: 0
    thread_set_state: 3594
 
 
VM Region Summary:
ReadOnly portion of Libraries: Total=286.6M resident=0K(0%) swapped_out_or_unallocated=286.6M(100%)
Writable regions: Total=98.4M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=98.4M(100%)
 
                                VIRTUAL   REGION
REGION TYPE                        SIZE    COUNT (non-coalesced)
===========                     =======  =======
Accelerate.framework               128K        2
Activity Tracing                  2048K        2
CG backing stores                 1524K        5
CG image                            52K       11
CG shared images                   304K       10
CoreAnimation                     8172K       42
CoreUI image data                 1384K       14
CoreUI image file                  192K        4
Dispatch continuations            8192K        2
Foundation                          24K        3
Image IO                           508K        6
Kernel Alloc Once                    8K        3
MALLOC                            49.6M       30
MALLOC guard page                   48K       10
Memory Tag 242                      12K        2
Memory Tag 83                       72K        7
OpenCL                               8K        2
Process Corpse Info               2048K        2
STACK GUARD                       56.0M        5
Stack                             9304K        7
VM_ALLOCATE                         76K       12
__DATA                            27.6M      263
__IMAGE                            528K        2
__LINKEDIT                        91.6M        6
__TEXT                           195.0M      268
__UNICODE                          552K        2
dylib                                4K        2
mapped file                      170.7M       59
shared memory                     16.3M       10
===========                     =======  =======
TOTAL                            641.2M      764

I apologize for overreaching.

— My informal point was it's pretty unusual, when actively debugging a problem, to have nothing more to go on than a plain "bus error" message. At the very least, active debugging would involve the debugger, which would provide more context at the point of the error.

— It seems to me that a 1-line C program that uses a garbage pointer to demonstrate a crash is nothing if not old-school. Surely? 😉

OK, now we’re cooking with gas!

This snippet:

Exception Type:        EXC_BAD_ACCESS (SIGBUS) 
Exception Codes:      0x000000000000000a, 0x000000010bebbb70 
Exception Note:        EXC_CORPSE_NOTIFY

indicates that the program crashed reading memory at 0x000000010bebbb70.

This snippet:

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 
0  ???                          0x000000010bebbb70 0 + 4494965616 
1  com.apple.CoreFoundation      0x00007fff9981daf4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20

implies that this crash was caused by an instruction fetch, in that the address for frame 0 matches the previous snippet.

This snippet:

Thread 0 crashed with X86 Thread State (64-bit): 
  rax: 0x00007ffee8d79520  rbx: 0x00007ffee8d79520  …
  rdi: 0x00007ffee8d79520  rsi: 0x000000010bedf09f  …
  r8: 0x0000000000000040  r9: 0x00007ffee8d147c8  …
  r12: 0x00007fff94a494c0  r13: 0x00007ffee8cf3da0  …
  rip: 0x000000010bebbb70  rfl: 0x0000000000010246  …

confirm that, because

rip

(the instruction pointer, which is the Intel term for program counter, or PC) is the same address.

This snippet is also interesting:

VM Regions Near 0x10bebbb70: 
--> mapped file            000000010be83000-000000010bee2000 [  380K] r-x/rwx SM=COW 
    mapped file            000000010bee2000-000000010beee000 [  48K] rw-/rwx SM=COW

Note that the address is within the first chunk, which claims to be a mapped file. The memory block is marked as executable (

r-x/rwx

) so you’d expect it to be code. The weird part is that it doesn’t show up in the Binary Images section at the end of the crash log.

OTOH that section seems to be completely broken. Look at how it starts:

            0 - 0xffffffffffffffff +Recipes (???) /Volumes//Recipes.app/Contents/MacOS/Recipes 
            0 - 0xffffffffffffffff +libswiftAppKit.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftAppKit.dylib 
            0 - 0xffffffffffffffff +libswiftCore.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftCore.dylib 
            0 - 0xffffffffffffffff +libswiftCoreData.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftCoreData.dylib 
            0 - 0xffffffffffffffff +libswiftCoreGraphics.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftCoreGraphics.dylib 
            0 - 0xffffffffffffffff +libswiftCoreImage.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftCoreImage.dylib 
            0 - 0xffffffffffffffff +libswiftDarwin.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftDarwin.dylib 
            0 - 0xffffffffffffffff +libswiftDispatch.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftDispatch.dylib 
            0 - 0xffffffffffffffff +libswiftFoundation.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftFoundation.dylib 
            0 - 0xffffffffffffffff +libswiftIOKit.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftIOKit.dylib 
            0 - 0xffffffffffffffff +libswiftObjectiveC.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftObjectiveC.dylib 
            0 - 0xffffffffffffffff +libswiftQuartzCore.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftQuartzCore.dylib 
            0 - 0xffffffffffffffff +libswiftXPC.dylib (???) /Volumes//Recipes.app/Contents/Frameworks/libswiftXPC.dylib 
  0x10fbe0000 -        0x10fbe2fff  libCGXType.A.dylib (960.7) <F52CB9D5-B366-3A93-B1E6-81B583675B19> /System/Library/Frameworks/CoreGraphics.framework/Versions/A/Resources/libCGXType.A.dylib 
…

The first 13 entries are tagged with reasonable library names, but their reported addresses are all messed up. I’ve never seen anything like that before. It’s almost like someone has unmapped all that memory.

And I’m sure it’s not a coincidence that the first valid-looking library,

libCGXType.A.dylib

, starts very close to the end of the memory block containing the crashing PC.

Weird.

How reproducible is this problem? Specifically, have you seen it happen on other machines?

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Thank you for not giving up!

The error is not directly reproducible. It occurs intermittenly, days apart. Usually, but not always, in relation to Sleep. I have gotten the error on my iMac and my MacBook. The application accesses a shared file on a Linux device on my LAN.

I had been getting occasional, random "xxxx has quit unexpectedly" for a long time. I concluded it was due to a network problem because I could reproduce it by turning WiFi off. In December, I added do-try-catch (tested through WiFi disconnect). But the errors continued, so I ran it from inside the package in Terminal. That's when I saw the "Bus error: 10" and, with help of this board, discovered the Crash Report. Whew!

Whatever is wrong, I think I injected it during December do-try-catch changes. But, part of debugging is asking "How would I intentionally create that error?". I'm coming up dry on that question because Swift keeps coders a safe distance from memory allocation/pointers.

A memory leak is a possibility, but Activity Monitor shows memory is stable +/-2% while operating.

Without something more specific to go on, I'm revising the code to add logging in the (apparently) vulnerable timerTick method. If that isn't illuminating, I may comment-out code until the problem goes away ... a crude, desparate and surprisingly effective debugging technique!

Thanks for your help and any clues or pointers are greatly appreciated.

The next step with wacky problems like this is to run the app with zombies. And then with the address sanitiser. If you’re lucky one of these will turn a hard-to-reproduce problem into an easy-to-reproduce one (-:

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

ZOMBIES - I've seen that mentoined and will research.

I have new clues and possible solution.

I deployed an updated version which included detailed progress logging.

func timerTick()
{ showActivity(message: "timerTick", level: LogLevel.TRACE)
  if  saveSecret.isEnabled == true { return }
  var attributes : [FileAttributeKey : Any]
  do
  { attributes = try FileManager.default.attributesOfItem(atPath: path)
  }
  catch let error as NSError
  { showActivity(message: "timerTick: " + error.localizedDescription)
    return
  }
  showActivity(message: "timerTick/a", level: LogLevel.TRACE)
 --OMITTED--OMITTED--
  showActivity(message: "timerTick/z", level: LogLevel.TRACE)
}

After a couple days, it failed again in the same way.

2017-01-24 10:00:55: timerTick
2017-01-24 10:01:30: timerTick/a
2017-01-24 10:01:30: timerTick/b
2017-01-24 10:01:30: timerTick/c
2017-01-24 10:01:30: timerTick/z

The DiagnosticReport says crash was at 10:01:37.118

The timer fires every 15 seconds.

Notice the 35 second delay between log event #1 and #1. That is not normal behavior. Enough time for another timer event.

Notice function timerTick reached the end ("/z")

Notice the 7 second delay between last logged event and the crash time.

I don't know timer internals well enough (at all) to be sure. But I think the timer is firing again before processing of the previous event is finished. This leads to message queuing issue or conflicts of some kind. Solution is to STOP the timer within timerTick. Or lengthen the timer expiration.

Is this plausible or am I grasping at straws?

But I think the timer is firing again before processing of the previous event is finished. This leads to message queuing issue or conflicts of some kind.

AFAICT you never stated which API you’re using for timers. It looks like you’re using either Swift’s

Timer

or the underlying Foundation API, NSTimer. If that’s the case then this is unlikely to be the problem. NSTimer callbacks are always serialised and NSTimer itself will deal well with the timer firing late.

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"