Status: Accepted
Owner: ----
CC: [email protected]
Labels: Type-Bug Priority-Medium
New issue 2047 by [email protected]: test-debug/ThreadedDebugging is
flaky
http://code.google.com/p/v8/issues/detail?id=2047
=== release test-debug ThreadedDebugging ===
Path: cctest/test-debug/ThreadedDebugging
--- stderr ---
#
# Fatal error in test/cctest/test-debug.cc, line 5016
# CHECK(8 <= source_line && source_line <= 13) failed
#
Happens both in release and debug mode on various Linux bots.
The failure can be triggered reliably by inserting a sleep() in
test-debug.cc:
+#include <unistd.h> // for usleep
and in void DebuggerThread::Run():
threaded_debugging_barriers.barrier_1.Wait();
usleep(1000);
v8::Debug::DebugBreak();
What happens is that when the debug break comes too late, the function
under test gets optimized (OSRed), and for some reason that throws off the
reported source position (it's 7 rather than in the [8..13] interval, which
is wrong because line 7 is outside the loop).
We could probably just disable optimization for this test, but I have a
suspicion that this should actually work as it is, and that there is a real
bug somewhere.
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