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Changed by [EMAIL PROTECTED] http://bugzilla.ximian.com/show_bug.cgi?id=77468 --- shadow/77468 2006-02-03 22:10:55.000000000 -0500 +++ shadow/77468.tmp.21955 2006-02-03 22:10:55.000000000 -0500 @@ -0,0 +1,92 @@ +Bug#: 77468 +Product: Mono: Runtime +Version: 1.1 +OS: +OS Details: OS X 10.4.4 on G4/G5, Linux 2.6.9 (uniprocessor ia32) +Status: NEW +Resolution: +Severity: +Priority: Wishlist +Component: misc +AssignedTo: [EMAIL PROTECTED] +ReportedBy: [EMAIL PROTECTED] +QAContact: [EMAIL PROTECTED] +TargetMilestone: --- +URL: +Cc: +Summary: usage of mono_thread_attach and mono_thread_detach cause _wapi_handle_unref warnings + +Please fill in this template when reporting a bug, unless you know what you are doing. +Description of Problem: + +Use of mono_thread_attach/mono_thread_detach cause code run from the finalizer thread to +generate _wapi_handle_unref warnings. + +According to Dick Porter (on mono-dev-list): +"It means something in the runtime has lost track of its handles and is +attempting to CloseHandle more times than the handle was opened. +... +The warning itself is harmless (the CloseHandle code ignores an unref +attempt in these circumstances) but it is a symptom of a bug - code +somewhere is relying on a handle that has vanished from underneath it." + +Steps to reproduce the problem: +1. Run following code: +On ia32 Linux, this code will not run long without crashing unless run against a version of Mono +from SVN that contains Paolo's patch for bug #77429 (http://bugs.ximian.com/show_bug.cgi? +id=77429). + +#include <pthread.h> +#include <mono/jit/jit.h> +#include <mono/metadata/metadata.h> +#include <mono/metadata/debug-helpers.h> +#include <mono/metadata/object.h> +#include <mono/metadata/threads.h> +#include <mono/metadata/appdomain.h> + +#define CHUNK_THREADCOUNT 200 + +static void *thread_function(void *monoDomain) { + printf("Attaching thread...\n"); + MonoThread *monoThread = mono_thread_attach((MonoDomain *)monoDomain); + printf("Thread (%p) attached.\n", monoThread); + + //normally, some threaded stuff would happen here. + + printf("Detaching thread (%p)\n", monoThread); + mono_thread_detach(monoThread); + printf("Thread (%p) detached.\n", monoThread); +} + +int main(int argc, char *argv[]) { + + mono_set_defaults(0, mono_parse_default_optimizations(NULL)); + MonoDomain *monoDomain = mono_jit_init("racy"); + + while(TRUE) { + pthread_t threads[CHUNK_THREADCOUNT]; + int i; + + for(i = 0; i < CHUNK_THREADCOUNT; i++) + pthread_create(threads + i, NULL, thread_function, monoDomain); + + for(i = 0; i < CHUNK_THREADCOUNT; i++) + pthread_join(threads[i], NULL); + } + + return(0); +} + +Actual Results: +Program spews logging output interspersed with large number of warnings that look like this: + +** (process:8433): WARNING **: _wapi_handle_unref: Attempting to unref unused handle 0x480 + +Expected Results: +Program should spew logging output until killed. + +How often does this happen? +Run the sample code for long enough, and it will generate warning output. This code will +ocasionally cause Mono on OS X to crash or deadlock, but that issue will be filed in another bug. + +Additional Information: _______________________________________________ mono-bugs maillist - [email protected] http://lists.ximian.com/mailman/listinfo/mono-bugs
