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From "Pavel Pervov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-3547) [drlvm] segfault on classloading due to use of alloca blowing the stack
Date Mon, 09 Apr 2007 08:34:32 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-3547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12487504
] 

Pavel Pervov commented on HARMONY-3547:
---------------------------------------

Santiago, the code you've reviewed in your last comment is only executed on VM bootstrap,
when central directories are read from JAR files reported via vm.boot.class.path. So, using
hundreds KBs of stack is ok there I believe.

P.S. Generally, changing those to alloca was a move forward fast VM startup.

> [drlvm] segfault on classloading due to use of alloca blowing the stack 
> ------------------------------------------------------------------------
>
>                 Key: HARMONY-3547
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3547
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>         Environment: linux, x86_64 both "latest" of Apr 1 and svn head built here.
>            Reporter: Santiago Gala
>         Assigned To: Gregory Shimansky
>         Attachments: H3547.patch, H3547.patch, harmony-alloca-stack-overflow.patch
>
>
> Running eclipse-3.2, all goes well, until it tries to index the documentation. Then I
get, after a while, the following dump:
> SIGSEGV in VM code.
> Stack trace:
>         0: BootstrapClassLoader::LoadFromJarFile(JarFile*, char const*, String const*,
bool*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1833)
>         1: BootstrapClassLoader::LoadFromFile(String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1743)
>         2: BootstrapClassLoader::DoLoadClass(Global_Env*, String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1535)
>         3: ClassLoader::LoadClass(Global_Env*, String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1490)
>         4: ClassLoader::LoadVerifyAndPrepareClass(Global_Env*, String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:359)
>         5: Class::load_ancestors(Global_Env*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/Class.cpp:273)
>         6: ClassLoader::DefineClass(Global_Env*, char const*, unsigned char*, unsigned
int, unsigned int, String const**) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:309)
>         7: BootstrapClassLoader::LoadFromJarFile(JarFile*, char const*, String const*,
bool*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1843)
>         8: BootstrapClassLoader::LoadFromFile(String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1743)
>         9: BootstrapClassLoader::DoLoadClass(Global_Env*, String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1535)
>         10: ClassLoader::LoadClass(Global_Env*, String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1490)
>         11: ClassLoader::LoadVerifyAndPrepareClass(Global_Env*, String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:359)
>         12: Class::load_ancestors(Global_Env*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/Class.cpp:273)
>         13: ClassLoader::DefineClass(Global_Env*, char const*, unsigned char*, unsigned
int, unsigned int, String const**) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:309)
>         14: BootstrapClassLoader::LoadFromJarFile(JarFile*, char const*, String const*,
bool*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1843)
>         15: BootstrapClassLoader::LoadFromFile(String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1743)
>         16: BootstrapClassLoader::DoLoadClass(Global_Env*, String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1535)
>         17: ClassLoader::LoadClass(Global_Env*, String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1490)
>         18: ClassLoader::LoadVerifyAndPrepareClass(Global_Env*, String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:359)
>         19: Class::load_ancestors(Global_Env*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/Class.cpp:273)
>         20: ClassLoader::DefineClass(Global_Env*, char const*, unsigned char*, unsigned
int, unsigned int, String const**) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:309)
>         21: BootstrapClassLoader::LoadFromJarFile(JarFile*, char const*, String const*,
bool*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1843)
>         22: BootstrapClassLoader::LoadFromFile(String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1743)
>         23: BootstrapClassLoader::DoLoadClass(Global_Env*, String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1535)
>         24: ClassLoader::LoadClass(Global_Env*, String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1490)
>         25: ClassLoader::LoadVerifyAndPrepareClass(Global_Env*, String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:359)
>         26: Class::load_ancestors(Global_Env*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/Class.cpp:273)
>         27: ClassLoader::DefineClass(Global_Env*, char const*, unsigned char*, unsigned
int, unsigned int, String const**) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:309)
>         28: BootstrapClassLoader::LoadFromJarFile(JarFile*, char const*, String const*,
bool*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1843)
>         29: BootstrapClassLoader::LoadFromFile(String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1743)
>         30: BootstrapClassLoader::DoLoadClass(Global_Env*, String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1535)
>         31: ClassLoader::LoadClass(Global_Env*, String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:1490)
>         32: ClassLoader::LoadVerifyAndPrepareClass(Global_Env*, String const*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/classloader.cpp:359)
>         33: Class::_resolve_class(Global_Env*, unsigned int) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/Resolve.cpp:167)
>         34: resolve_class (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/Resolve.cpp:914)
>         35: Jitrino::Jet::Compiler::handle_ik_obj(Jitrino::Jet::JInst const&) (/home/sgala/newcode/harmony/working_vm/vm/jitrino/src/jet/bcproc.cpp:581)
>         36: Jitrino::Jet::Compiler::handle_inst() (/home/sgala/newcode/harmony/working_vm/vm/jitrino/src/jet/bcproc.cpp:71)
>         37: Jitrino::Jet::Compiler::comp_gen_insts(unsigned int, unsigned int, unsigned
int) (/home/sgala/newcode/harmony/working_vm/vm/jitrino/src/jet/compiler.cpp:1026)
>         38: Jitrino::Jet::Compiler::comp_gen_code_bb(unsigned int) (/home/sgala/newcode/harmony/working_vm/vm/jitrino/src/jet/compiler.cpp:818)
>         39: Jitrino::Jet::Compiler::compile(void*, Method*, OpenMethodExecutionParams
const&) (/home/sgala/newcode/harmony/working_vm/vm/jitrino/src/jet/compiler.cpp:393)
>         40: Jitrino::Jet::compile_with_params(void*, void*, Method*, OpenMethodExecutionParams)
(/home/sgala/newcode/harmony/working_vm/vm/jitrino/src/jet/jet.cpp:523)
>         41: JIT_compile_method_with_params (/home/sgala/newcode/harmony/working_vm/vm/jitrino/src/vm/drl/DrlJITInterface.cpp:274)
>         42: Dll_JIT::compile_method_with_params(void*, Method*, OpenMethodExecutionParams)
(/home/sgala/newcode/harmony/working_vm/vm/vmcore/include/dll_jit_intf.h:86)
>         43: compile_do_compilation_jit(Method*, JIT*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/jit/compile.cpp:657)
>         44: vm_compile_method (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/class_support/C_Interface.cpp:2487)
>         45: DrlEMImpl::compileMethod(Method*) (/home/sgala/newcode/harmony/working_vm/vm/em/src/DrlEMImpl.cpp:570)
>         46: CompileMethod (/home/sgala/newcode/harmony/working_vm/vm/em/src/em_intf.cpp:50)
>         47: compile_do_compilation (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/jit/compile.cpp:770)
>         48: compile_me(Method*) (/home/sgala/newcode/harmony/working_vm/vm/vmcore/src/jit/compile.cpp:790)
>         49: ?? (??:-1)
>         50: org/apache/xalan/xsltc/trax/TransformerImpl.transform(Ljavax/xml/transform/Source;Lorg/apache/xml/serializer/SerializationHandler;Ljava/lang/String;)V
(TransformerImpl.java:628)
>         51: org/apache/xalan/xsltc/trax/TransformerImpl.transform(Ljavax/xml/transform/Source;Ljavax/xml/transform/Result;)V
(TransformerImpl.java:301)
>         52: org/eclipse/help/internal/xhtml/UATransformManager.convertToString(Lorg/w3c/dom/Document;)Ljava/lang/String;
(UATransformManager.java:75)
>         53: org/eclipse/help/internal/xhtml/UATransformManager.getAsInputStream(Lorg/w3c/dom/Document;)Ljava/io/InputStream;
(UATransformManager.java:91)
>         54: org/eclipse/help/internal/DynamicContentProducer.openXHTMLFromPlugin(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Z)Ljava/io/InputStream;
(DynamicContentProducer.java:124)
>         55: org/eclipse/help/internal/DynamicContentProducer.getInputStream(Ljava/lang/String;Ljava/lang/String;Ljava/util/Locale;)Ljava/io/InputStream;
(DynamicContentProducer.java:53)
>         56: org/eclipse/help/internal/util/ResourceLocator.openFromProducer(Lorg/osgi/framework/Bundle;Ljava/lang/String;Ljava/lang/String;)Ljava/io/InputStream;
(ResourceLocator.java:227)
>         57: org/eclipse/help/internal/protocols/HelpURLConnection.getInputStream()Ljava/io/InputStream;
(HelpURLConnection.java:113)
>         58: java/net/URL.openStream()Ljava/io/InputStream; (URL.java:664)
>         59: org/eclipse/help/internal/search/HTMLDocParser.openDocument(Ljava/net/URL;)V
(HTMLDocParser.java:62)
>         60: org/eclipse/help/internal/search/HTMLSearchParticipant.addDocument(Lorg/eclipse/help/search/ISearchIndex;Ljava/lang/String;Ljava/lang/String;Ljava/net/URL;Ljava/lang/String;Lorg/apache/lucene/document/Document;)Lorg/eclipse/core/runtime/IStatus;
(HTMLSearchParticipant.java:53)
>         61: org/eclipse/help/internal/search/SearchIndex.addDocument(Ljava/lang/String;Ljava/net/URL;)Lorg/eclipse/core/runtime/IStatus;
(SearchIndex.java:215)
>         62: org/eclipse/help/internal/search/IndexingOperation.addDocuments(Lorg/eclipse/core/runtime/IProgressMonitor;Ljava/util/Collection;Z)V
(IndexingOperation.java:279)
>         63: org/eclipse/help/internal/search/IndexingOperation.addNewDocuments(Lorg/eclipse/core/runtime/IProgressMonitor;Ljava/util/Collection;Z)Ljava/util/Map;
(IndexingOperation.java:175)
>         64: org/eclipse/help/internal/search/IndexingOperation.execute(Lorg/eclipse/core/runtime/IProgressMonitor;)V
(IndexingOperation.java:105)
>         65: org/eclipse/help/internal/search/SearchManager.updateIndex(Lorg/eclipse/core/runtime/IProgressMonitor;Lorg/eclipse/help/internal/search/SearchIndex;Lorg/eclipse/help/internal/search/ProgressDistributor;)V
(SearchManager.java:883)
>         66: org/eclipse/help/internal/search/SearchManager.ensureIndexUpdated(Lorg/eclipse/core/runtime/IProgressMonitor;Lorg/eclipse/help/internal/search/SearchIndexWithIndexingProgress;)V
(SearchManager.java:847)
>         67: org/eclipse/help/internal/search/federated/IndexerJob.run(Lorg/eclipse/core/runtime/IProgressMonitor;)Lorg/eclipse/core/runtime/IStatus;
(IndexerJob.java:27)
>         68: org/eclipse/core/internal/jobs/Worker.run()V (Worker.java:58)
>         69: java/lang/Thread.runImpl()V (Thread.java:672)
> <end of stack trace>
> As seen in slot 50, xsltc is generating code for a XSL transformation, and giving it
to the interpreter. The crash happens after Jitrino tries to load a class in the bootstrap
loader.

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