I suffered from the same error. The crash stack like below. I use the Multipeer Connectivity. I don't know why this happens. I can't reproduce it . it may happen by accident. Someone can help me ?Thank you very much.
Date/Time: 2020-10-14 14:11:19.1092 +0000
Launch Time: 2020-10-14 14:07:11.7500 +0000
OS Version: iPhone OS 14.0 (18A373)
Release Type: User
Baseband Version: 5.00.00
Report Version: 104
Exception Type: EXCBREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x0000000188eac4c4
Termination Signal: Trace/BPT trap: 5
Termination Reason: Namespace SIGNAL, Code 0x5
Terminating Process: exc handler [3212]
Triggered by Thread: 0
Thread 0 name:
Thread 0 Crashed:
0 CoreFoundation 0x0000000188eac4c4 CFAssertMismatchedTypeID + 108 (CFRuntime.c:934)
1 CoreFoundation 0x0000000188eac4bc CFAssertMismatchedTypeID + 100 (CFRuntime.c:933)
2 CoreFoundation 0x0000000188dbdb0c CFRunLoopSourceInvalidate + 300 (CFRuntimeInternal.h:118)
3 CFNetwork 0x00000001894655b0 BrowserCancel(CFNetServiceBrowser*) + 76 (CFNetServiceBrowser.c:178)
4 CoreFoundation 0x0000000188dc1240 CFRUNLOOPISCALLINGOUTTOASOURCE0PERFORMFUNCTION + 24 (CFRunLoop.c:1967)
5 CoreFoundation 0x0000000188dc1140 CFRunLoopDoSource0 + 204 (CFRunLoop.c:2011)
6 CoreFoundation 0x0000000188dc04ec CFRunLoopDoSources0 + 356 (CFRunLoop.c:2056)
7 CoreFoundation 0x0000000188dbaa40 CFRunLoopRun + 776 (CFRunLoop.c:2925)
8 CoreFoundation 0x0000000188dba200 CFRunLoopRunSpecific + 572 (CFRunLoop.c:3242)
9 GraphicsServices 0x000000019eeb5598 GSEventRunModal + 160 (GSEvent.c:2259)
10 UIKitCore 0x000000018b680004 -[UIApplication run] + 1052 (UIApplication.m:3270)
11 UIKitCore 0x000000018b6855d8 UIApplicationMain + 164 (UIApplication.m:4739)
12 ExMessager 0x00000001027b21f8 0x102714000 + 647672
13 libdyld.dylib 0x0000000188a99598 start + 4
Thread 1 name:
Thread 1:
0 libsystemkernel.dylib 0x00000001b37b972c psynchcvwait + 8
1 libsystempthread.dylib 0x00000001ce71c330 pthreadcondwait$VARIANT$mp + 1180 (pthreadcond.c:636)
2 libc.1.dylib 0x000000019c703e0c std::1::conditionvariable::wait(std::1::uniquelock<std::1::mutex>&) + 24 (threadingsupport:390)
3 JavaScriptCore 0x00000001928fd53c void std::1::conditionvariableany::wait<std::1::uniquelock<bmalloc::Mutex> >(std::1::uniquelock<bmalloc::Mutex>&) + 108 (conditionvariable:203)
4 JavaScriptCore 0x0000000192901ea0 bmalloc::Scavenger::threadRunLoop() + 240 (conditionvariable:212)
5 JavaScriptCore 0x00000001929018e4 bmalloc::Scavenger::threadEntryPoint(bmalloc::Scavenger*) + 12 (Scavenger.cpp:395)
6 JavaScriptCore 0x0000000192902fc4 void* std::1::threadproxy<std::1::tuple<std::1::uniqueptr<std::1::threadstruct, std::1::defaultdelete<std::1::_threadstruct> >, void (*)(bmalloc::Scavenger*), bmalloc::Scaveng... + 44 (typetraits:3545)
7 libsystempthread.dylib 0x00000001ce722b70 pthreadstart + 288 (pthread.c:880)
8 libsystempthread.dylib 0x00000001ce727880 threadstart + 8
Thread 2 name:
Thread 2:
0 libsystemkernel.dylib 0x00000001b37968c4 machmsgtrap + 8
1 libsystemkernel.dylib 0x00000001b3795cc8 machmsg + 72 (machmsg.c:103)
2 CoreFoundation 0x0000000188dc074c _CFRunLoopServiceMachPort + 376 (CFRunLoop.c:2641)
3 CoreFoundation 0x0000000188dbabd0 CFRunLoopRun + 1176 (CFRunLoop.c:2974)
4 CoreFoundation 0x0000000188dba200 CFRunLoopRunSpecific + 572 (CFRunLoop.c:3242)
5 WebCore 0x0000000195a99e6c RunWebThread(void*) + 672 (WebCoreThread.mm:625)
6 libsystempthread.dylib 0x00000001ce722b70 pthreadstart + 288 (pthread.c:880)
7 libsystempthread.dylib 0x00000001ce727880 threadstart + 8
