ios - In what cases will a 'release' call recur? -


i have segmentation fault (sigsegv) following stack-trace:

thread 6 crashed: 0   libobjc.a.dylib                     objc_msgsend (in libobjc.a.dylib) + 16 1   coredata                            -[nsmanagedobject release] (in coredata) + 160 2   libobjc.a.dylib                     object_cxxdestructfromclass(objc_object*, objc_class*) (in libobjc.a.dylib) + 148 3   libobjc.a.dylib                     objc_destructinstance (in libobjc.a.dylib) + 92 4   coredata                            _pfdeallocateobject (in coredata) + 28 5   myapp                               -[job dealloc] (in myapp) (job.m:113) 6   coredata                            -[_pfmanagedobjectreferencequeue _queuefordealloc:] (in coredata) + 272 7   coredata                            -[nsmanagedobject release] (in coredata) + 160 8   coredata                            -[_pfarray dealloc] (in coredata) + 100 9   libobjc.a.dylib                     (anonymous namespace)::autoreleasepoolpage::pop(void*) (in libobjc.a.dylib) + 564

note dealloc method in job class empty/a no-op. appears vestigial remnant before code converted arc.

what strikes me strange in stack-trace there's call [nsmangedobject release] leads subsequent call [nsmanagedobject release] before completes. gives appearance of recursion, though guess second call other nsmanagedobject instance , no actual recursion occurring.

but cases in occur? name of preceding method in chain (object_cxxdestructfromclass), seems runtime deallocating class member-variables may exist. correct?

the job class have ivar field used keep transient reference nsmanagedobject instance, crash occurring when runtime attempts release instance referenced ivar (which, appear, has been released)?


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