Comment #4 on issue 361 by [email protected]: ThreadSanitizer reports
dubious practices in V8
http://code.google.com/p/v8/issues/detail?id=361
This one is strange:
WARNING: Possible data race during write of size 4 at 0x831A028: {{{
T1 (locks held: {}):
#0
v8::internal::Debug::set_debugger_entry(v8::internal::EnterDebugger*)
src/debug.h:292
#1 v8::internal::EnterDebugger::EnterDebugger() src/debug.h:713
#2
v8::internal::Debugger::OnAfterCompile(v8::internal::Handle<v8::internal::Script>,
v8::internal::Handle<v8::internal::JSFunction>) src/debug.cc:1990
#3 v8::internal::MakeFunction(bool, bool,
v8::internal::Compiler::ValidationState,
v8::internal::Handle<v8::internal::Script>,
v8::internal::Handle<v8::internal::Context>, v8::Extension*,
v8::internal::ScriptDataImpl*) src/compiler.cc:243
#4
v8::internal::Compiler::CompileEval(v8::internal::Handle<v8::internal::String>,
v8::internal::Handle<v8::internal::Context>, bool,
v8::internal::Compiler::ValidationState) src/compiler.cc:346
#5 v8::internal::Runtime_CompileString(v8::internal::Arguments)
src/runtime.cc:5078
#6 ???
#7 ???
#8 ???
#9 ???
#10 ???
#11 ???
Concurrent read(s) happened at (OR AFTER) these points:
T2 (locks held: {}):
#0 v8::internal::Debug::InDebugger() src/debug.h:221
#1
v8::internal::Debugger::ProcessCommand(v8::internal::Vector<unsigned short
const>, v8::Debug::ClientData*) src/debug.cc:2428
#2 v8::Debug::SendCommand(unsigned short const*, int,
v8::Debug::ClientData*)
src/api.cc:3659
#3 DebuggerThread::Run() test/cctest/test-debug.cc:3920
#4 v8::internal::ThreadEntry(void*) src/platform-linux.cc:429
#5 ThreadSanitizerStartThread ts_valgrind_intercepts.c:504
Address 0x831A028 is 40 bytes inside data symbol
"_ZN2v88internal5Debug13thread_local_E"
}}}
Two threads are accessing a static object called thread_local_, which is
NOT thread-
local
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