We're getting several crashes recently with this stack:

Thread : Fatal Exception: NSInternalInconsistencyException, via: 
 Assert(_asyncTaskCount >= 0);

0  CoreFoundation                 0x30082fd3 __exceptionPreprocess + 130
1  libobjc.A.dylib                0x3ac4accf objc_exception_throw + 38
2  CoreFoundation                 0x30082ead +[NSException raise:format:]
3  Foundation                     0x30a2fdb7 -[NSAssertionHandler 
handleFailureInFunction:file:lineNumber:description:] + 86
4  <myApp>                        0x00702b9f _AssertFailed (Test.m:348)
5  <myApp>                        0x006c8a4f -[CBL_Replicator 
asyncTasksFinished:] + 106
6  <myApp>                        0x006cd041 __33-[CBL_Puller 
pullRemoteRevision:]_block_invoke (CBL_Puller.m:431)
7  <myApp>                        0x006d5733 -[CBLRemoteRequest 
respondWithResult:error:] (CBLRemoteRequest.m:153)
8  <myApp>                        0x006d5885 -[CBLRemoteRequest stop] 
(CBLRemoteRequest.m:174)
9  CoreFoundation                 0x2fff31f5 -[NSArray 
makeObjectsPerformSelector:] + 300
10 <myApp>                        0x006c9f67 -[CBL_Replicator 
stopRemoteRequests] (CBL_Replicator.m:730)
11 <myApp>                        0x006c8457 -[CBL_Replicator goOffline] 
(CBL_Replicator.m:414)
12 <myApp>                        0x006cbdef -[CBL_Puller goOffline] 
(CBL_Puller.m:197)
13 <myApp>                        0x006c86f1 -[CBL_Replicator 
reachabilityChanged:] (CBL_Replicator.m:460)
14 <myApp>                        0x006c8895 -[CBL_Replicator updateActive] 
(CBL_Replicator.m:482)
15 <myApp>                        0x006cd041 __33-[CBL_Puller 
pullRemoteRevision:]_block_invoke (CBL_Puller.m:431)
16 <myApp>                        0x006d5733 -[CBLRemoteRequest 
respondWithResult:error:] (CBLRemoteRequest.m:153)
17 <myApp>                        0x006d6425 -[CBLRemoteRequest 
connection:didFailWithError:] (CBLRemoteRequest.m:369)
18 <myApp>                        0x006d5957 -[CBLRemoteRequest 
cancelWithStatus:] (CBLRemoteRequest.m:184)
19 <myApp>                        0x006e0efd -[CBLMultipartDownloader 
connection:didReceiveResponse:] (CBLMultipartDownloader.m:87)
20 Foundation                     0x309c1fc3 __65-[NSURLConnectionInternal 
_withConnectionAndDelegate:onlyActive:]_block_invoke + 54
21 Foundation                     0x309c1f07 -[NSURLConnectionInternal 
_withConnectionAndDelegate:onlyActive:] + 206
22 Foundation                     0x309c1e21 -[NSURLConnectionInternal 
_withActiveConnectionAndDelegate:] + 60
23 Foundation                     0x309c1ddf 
_NSURLConnectionDidReceiveResponse + 82
...
36 <myApp>                        0x006c5803 -[CBL_Server runServerThread] 
(CBL_Server.m:113)


What exactly is CBLMultipartDownloader? Does it relate to CBL attachments? 
 There should be no reason for this document to be downloading an 
attachment, BUT we last updated CBL April 16. The last code we got was 
b9221d0 was from Jens Alfke, April 15 "Merge branch 'master' into stable. 
 Which I found out today means we have a CBL bug (introduced March 31) 
where attachments get uploaded/downloaded more often than they need to 
(issue #326).

I'll try to arrange a pull of CBL in the next week, which should fix that 
particular bug, but am worried it would merely mask whatever crashing bug 
is happening in this stack, by making binary attachment transfer only 
happen when it actually needs to (which isn't that often for us).

Note that in all the crashlytics stacks, the percentage of crashes when the 
app is in the foreground is 0%.  So this is only happening when our app has 
been sent to the background, which I assume may help diagnose the problem...

I see that issue #336 also refers to this same assertion (_asyncTaskCount 
>= 0), but that stack refers to CBLMultipartUploader, followed by 
reachabilityChanged: whereas the crash I'm seeing is CBLMultipartDownloader 
followed by reachabilityChanged. I'm not sure if that makes this a 
different issue or the same issue.

-- Tim Gogolin
Adobe Systems Inc.

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