macOS 12.3
This is a rather rare bug (never seen before):
Thread 12 Crashed:: Dispatch queue: เสือ :: NSOperation 0x61800184fbd0 (QOS:
UTILITY)
0 libsystem_kernel.dylib 0x00007fffb3d65dd6 __pthread_kill + 10
1 libsystem_pthread.dylib 0x00007fffb3e51787 pthread_kill + 90
2 libsystem_c.dylib 0x00007fffb3ccb420 abort + 129
3 libc++abi.dylib 0x00007fffb282885a abort_message + 266
4 libc++abi.dylib 0x00007fffb284dc4f
default_terminate_handler() + 267
5 libobjc.A.dylib 0x00007fffb3357b8e _objc_terminate() +
103
6 libc++abi.dylib 0x00007fffb284ad69
std::__terminate(void (*)()) + 8
7 libc++abi.dylib 0x00007fffb284ade3 std::terminate() + 51
8 libdispatch.dylib 0x00007fffb3c010cc
_dispatch_client_callout + 28
9 libdispatch.dylib 0x00007fffb3c17ae5
_dispatch_queue_serial_drain + 896
10 libdispatch.dylib 0x00007fffb3c09cd9
_dispatch_queue_invoke + 1046
11 libdispatch.dylib 0x00007fffb3c02e70
_dispatch_root_queue_drain + 476
12 libdispatch.dylib 0x00007fffb3c02c47
_dispatch_worker_thread3 + 99
13 libsystem_pthread.dylib 0x00007fffb3e4e712 _pthread_wqthread +
1299
14 libsystem_pthread.dylib 0x00007fffb3e4e1ed start_wqthread + 13
The NSOperationQueue named “ เสือ" is created at the start of the app thusly:
@interface EchoStreamServer()
@property (strong) NSOperationQueue *commandOperationQueue;
@end
@implementation EchoStreamServer
- (instancetype)initWithInputStream: (NSInputStream *)istr
outputStream:(NSOutputStream *)ostr owner: (id <EchoProtocol>)oo security:
securityThing service: (NSNetService *)svice;
{
self = [ super initWithInputStream: istr …. ];
if ( self == nil ) return nil;
_commandOperationQueue = [ [ NSOperationQueue alloc ] init ];
_commandOperationQueue.name = @"เสือ";
_commandOperationQueue.qualityOfService = [ oo echoQualityOfService ];
// NSQualityOfServiceUtility
return self;
}
// this is called as answer to a request from a client:
- (void)sendToOwnerObject: obb seqNbr: (NSUInteger)seqNbr;
{
if ( self.owner == nil )…. // error
NSBlockOperation *echoOperation = [ [ NSBlockOperation alloc ] init ];
__weak NSBlockOperation *weakBo = echoOperation;
[ echoOperation addExecutionBlock: ^void(void)
{ [ self.owner echoObject: obb
seqNbr: seqNbr
from: self
operation: weakBo
];
}
];
[ self.commandOperationQueue addOperation: echoOperation ];
}
// this probably is never called:
- (void)cancelEchoOperations: (BOOL)explicit;
{
[ self.commandOperationQueue cancelAllOperations ];
…
}
Any ideas how to debug this?
Gerriet.
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