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Date: Mon, 11 Dec 2006 05:21:22 -0800 (PST)
From: "Pavel Pervov (JIRA)" <jira@apache.org>
To: commits@harmony.apache.org
Subject: [jira] Updated: (HARMONY-2083) [drlvm] Synchronization problem in
 class resolution code
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     [ http://issues.apache.org/jira/browse/HARMONY-2083?page=all ]

Pavel Pervov updated HARMONY-2083:
----------------------------------

    Attachment: H2083.patch

Attached patch is intended to fix the problem reported.

Although the patch scope is wider than reported by this test - it removes cache of classes which loading or initialization had failed. So, the root of this assertion is removed from the codebase.

> [drlvm] Synchronization problem in class resolution code
> --------------------------------------------------------
>
>                 Key: HARMONY-2083
>                 URL: http://issues.apache.org/jira/browse/HARMONY-2083
>             Project: Harmony
>          Issue Type: Bug
>            Reporter: Mikhail Fursov
>         Attachments: H2083.patch
>
>
> The test fails in -Xem:opt and -Xem:jet modes:
> public class Test extends Thread {
>     static final int N_THREADS = 100;
>     static final int N_ITERS = 500;
>     public static void main(String[] args) throws Exception {
>         Thread threads[] = new Thread[N_THREADS];
>         for (int i = 0; i < N_THREADS; i++)  threads[i] = new Test();
>         System.out.println("START");
>         for (int i = 0; i < N_THREADS; i++)  threads[i].start();
>         System.out.println("JOIN");
>         for (int i = 0; i < N_THREADS; i++)  threads[i].join();
>         System.out.println("PASSED");
>     }
>     public void run() {
>         for (int i = 0; i < N_ITERS; i++) {
>             try {
>                 new Missed();
>             } catch (Throwable e) {}
>         }
>     } 
> }
> class Missed {
> }
> compile it and remove Missed.class file
> The stacktrace of failure I have is:
> >	harmonyvm.dll!_NMSG_WRITE(int rterrnum=10)  Line 195	C
>  	harmonyvm.dll!abort()  Line 44 + 0x7	C
>  	harmonyvm.dll!MapEx<String const *,ClassLoader::FailedClass>::Insert(const String * key=0x02c0d5a4, ClassLoader::FailedClass & elem={...})  Line 271	C++
>  	harmonyvm.dll!ClassLoader::AddFailedClass(const String * className=0x02c0d5a4, _jobject * const exn=0x02cef2a8)  Line 412	C++
>  	harmonyvm.dll!UserDefinedClassLoader::DoLoadClass(Global_Env * env=0x011e4258, const String * className=0x02c0d5a4)  Line 1862	C++
>  	harmonyvm.dll!ClassLoader::LoadClass(Global_Env * env=0x011e4258, const String * className=0x02c0d5a4)  Line 1694 + 0x15	C++
>  	harmonyvm.dll!ClassLoader::LoadVerifyAndPrepareClass(Global_Env * env=0x011e4258, const String * name=0x02c0d5a4)  Line 387 + 0x10	C++
>  	harmonyvm.dll!_resolve_class(Global_Env * env=0x011e4258, Class * clss=0x02b3d090, unsigned int cp_index=12)  Line 157 + 0x13	C++
>  	harmonyvm.dll!_resolve_class_new(Global_Env * env=0x011e4258, Class * clss=0x02b3d090, unsigned int cp_index=12)  Line 221 + 0x11	C++
>  	harmonyvm.dll!resolve_class_new(void * h=0x0351f8a0, Class * c=0x02b3d090, unsigned int index=12)  Line 901 + 0x1a	C++
>  	harmonyvm.dll!vm_resolve_class_new(void * h=0x0351f8a0, Class * c=0x02b3d090, unsigned int index=12)  Line 902 + 0x11	C++
>  	jitrino.dll!Jitrino::Jet::Compiler::gen_magic()  Line 106 + 0x15	C++
>  	jitrino.dll!Jitrino::Jet::Compiler::handle_inst()  Line 51 + 0x7	C++
>  	jitrino.dll!Jitrino::Jet::Compiler::comp_gen_insts(unsigned int pc=0, unsigned int parentPC=47, unsigned int jsr_lead=4294967295)  Line 1001	C++
>  	jitrino.dll!Jitrino::Jet::Compiler::comp_gen_code_bb(unsigned int pc=9)  Line 819 + 0xe	C++
>  	jitrino.dll!Jitrino::Jet::Compiler::compile(void * ch=0x0351f8a0, Method * method=0x02c175e0, const OpenMethodExecutionParams & params={...})  Line 394	C++
>  	jitrino.dll!Jitrino::Jet::compile_with_params(void * jit_handle=0x0123b0e0, void * ch=0x0351f8a0, Method * method=0x02c175e0, OpenMethodExecutionParams params={...})  Line 524 + 0x2c	C++
>  	jitrino.dll!JIT_compile_method_with_params(void * jit=0x0123b0e0, void * compilation=0x0351f8a0, Method * method_handle=0x02c175e0, OpenMethodExecutionParams compilation_params={...})  Line 278 + 0x1b	C++
>  	harmonyvm.dll!Dll_JIT::compile_method_with_params(void * compilation=0x0351f8a0, Method * method=0x02c175e0, OpenMethodExecutionParams flags={...})  Line 86 + 0x18	C++
>  	harmonyvm.dll!compile_do_compilation_jit(Method * method=0x02c175e0, JIT * jit=0x0123b0e0)  Line 704 + 0x19	C++
>  	harmonyvm.dll!vm_compile_method(void * jit=0x0123b0e0, Method * method=0x02c175e0)  Line 2538 + 0xd	C++
>  	em.dll!DrlEMImpl::compileMethod(Method * mh=0x02c175e0)  Line 517 + 0x13	C++
>  	em.dll!CompileMethod(Method * method_handle=0x02c175e0)  Line 49 + 0x19	C++
>  	harmonyvm.dll!compile_do_compilation(Method * method=0x02c175e0, JIT_Flags flags={...})  Line 784 + 0x15	C++
>  	harmonyvm.dll!compile_jit_a_method(Method * method=0x02c175e0)  Line 832 + 0xd	C++

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