[Webkit-unassigned] [Bug 209333] br_table behavior

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Mar 24 09:32:29 PDT 2020


https://bugs.webkit.org/show_bug.cgi?id=209333

Alexey Proskuryakov <ap at webkit.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fpizlo at apple.com,
                   |                            |keith_miller at apple.com,
                   |                            |webkit-bug-importer at group.a
                   |                            |pple.com, ysuzuki at apple.com

--- Comment #1 from Alexey Proskuryakov <ap at webkit.org> ---
I can reproduce this with WebKit as shipped with macOS 10.15.4. This is all that sample says, it's just looping in wasm_entry.

Call graph:
    9415 Thread_2342286   DispatchQueue_1: com.apple.main-thread  (serial)
    + 9415 start  (in libdyld.dylib) + 1  [0x7fff6b6decc9]
    +   9415 ???  (in jsc)  load address 0x10cec7000 + 0x436b  [0x10cecb36b]
    +     9415 ???  (in jsc)  load address 0x10cec7000 + 0x56c6  [0x10cecc6c6]
    +       9415 ???  (in jsc)  load address 0x10cec7000 + 0xc64a  [0x10ced364a]
    +         9415 JSC::evaluate(JSC::JSGlobalObject*, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&)  (in JavaScriptCore) + 270  [0x7fff3580959e]
    +           9415 JSC::Interpreter::executeProgram(JSC::SourceCode const&, JSC::JSGlobalObject*, JSC::JSObject*)  (in JavaScriptCore) + 12478  [0x7fff355effee]
    +             9415 vmEntryToJavaScript  (in JavaScriptCore) + 200  [0x7fff34ff82bf]
    +               9415 llint_entry  (in JavaScriptCore) + 93344  [0x7fff3500f10d]
    +                 9415 ???  (in <unknown binary>)  [0x2ebdd2601178]
    +                   9415 JSC::callWebAssemblyFunction(JSC::JSGlobalObject*, JSC::CallFrame*)  (in JavaScriptCore) + 1235  [0x7fff35adf9b3]
    +                     9415 vmEntryToJavaScript  (in JavaScriptCore) + 200  [0x7fff34ff82bf]
    +                       9415 ???  (in <unknown binary>)  [0x2ebdd260170c]
    +                         9415 wasm_entry  (in JavaScriptCore) + 13022,12990,...  [0x7fff35014322,0x7fff35014302,...]
    9415 Thread_2342288: JavaScriptCore bmalloc scavenger
    + 9415 thread_start  (in libsystem_pthread.dylib) + 15  [0x7fff6b8deb8b]
    +   9415 _pthread_start  (in libsystem_pthread.dylib) + 148  [0x7fff6b8e3109]
    +     9415 void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(bmalloc::Scavenger*), bmalloc::Scavenger*> >(void*)  (in JavaScriptCore) + 39  [0x7fff35c1dec7]
    +       9415 bmalloc::Scavenger::threadEntryPoint(bmalloc::Scavenger*)  (in JavaScriptCore) + 9  [0x7fff35c1b7e9]
    +         9415 bmalloc::Scavenger::threadRunLoop()  (in JavaScriptCore) + 299  [0x7fff35c1bc1b]
    +           9415 void std::__1::condition_variable_any::wait<std::__1::unique_lock<bmalloc::Mutex> >(std::__1::unique_lock<bmalloc::Mutex>&)  (in JavaScriptCore) + 84  [0x7fff35c17414]
    +             9415 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&)  (in libc++.1.dylib) + 18  [0x7fff689b2592]
    +               9415 _pthread_cond_wait  (in libsystem_pthread.dylib) + 698  [0x7fff6b8e3425]
    +                 9415 __psynch_cvwait  (in libsystem_kernel.dylib) + 10  [0x7fff6b822882]
    9415 Thread_2342289
      9415 start_wqthread  (in libsystem_pthread.dylib) + 15  [0x7fff6b8deb77]
        9415 _pthread_wqthread  (in libsystem_pthread.dylib) + 390  [0x7fff6b8dfaa1]
          9415 __workq_kernreturn  (in libsystem_kernel.dylib) + 10  [0x7fff6b8214ce]

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