[lldb-dev] TestEvents test case causes python runner to dump core

[jingham at apple.com]

I don't know what is going on on the Linux side, but r220113 is a patch that only changed the test case.  It really shouldn't be possible to cause a core dump by driving the SB API's.  Plus, what the test is doing is something the SB API's should support.  So I think this change is not in itself the bug, but rather it is showing up a real bug somewhere in the Linux process support.  IMO the correct solution should not be to revert the test change, but to figure out what is going on in the underlying Linux support.  

Not sure Greg is the proper person to do that, but anyway it seems to me the correct thing to do for the nonce is skip the test on Linux and file a PR to get to the underlying cause.

Jim



> On Oct 21, 2014, at 3:53 AM, Matthew Gardiner <mg11 at csr.com> wrote:
> 
> If I revert Greg Clayton's change r220113, then the core dump problem
> vanishes.
> 
> I also found that running with r220113, but with the invocations of
> SetAsync(True) removed, see below:
> 
> 
> 
> ===================================================================
> --- test/python_api/event/TestEvents.py	(revision 220282)
> +++ test/python_api/event/TestEvents.py	(working copy)
> @@ -67,7 +67,7 @@
>         """Create a listener and use SBEvent API to print the events
> received."""
>         exe = os.path.join(os.getcwd(), "a.out")
> 
> -        self.dbg.SetAsync(True)
> +#        self.dbg.SetAsync(True)
> 
>         # Create a target by the debugger.
>         target = self.dbg.CreateTarget(exe)
> @@ -142,7 +142,7 @@
>         """Get the listener associated with the debugger and exercise
> WaitForEvent API."""
>         exe = os.path.join(os.getcwd(), "a.out")
> 
> -        self.dbg.SetAsync(True)
> +#       self.dbg.SetAsync(True)
> 
>         # Create a target by the debugger.
>         target = self.dbg.CreateTarget(exe)
> @@ -211,7 +211,7 @@
>         """Get the broadcaster associated with the process and wait for
> broadcaster events."""
>         exe = os.path.join(os.getcwd(), "a.out")
> 
> -        self.dbg.SetAsync(True)
> +#        self.dbg.SetAsync(True)
> 
>         # Create a target by the debugger.
>         target = self.dbg.CreateTarget(exe)
> 
> 
> also fixes the core dump, but leaves us with a couple of failing cases.
> 
> Greg, could you fix this, so that your change does not have to be
> reverted in order to get the linux python tests to run?
> 
> thanks
> Matt
> 
> 
> 
> On Tue, 2014-10-21 at 11:37 +0100, Matthew Gardiner wrote:
>> Sorry, I forgot to mention, the core dump emanates from the failed
>> assertion below: 
>> 
>> 
>> UNSUPPORTED: LLDB (gcc-x86_64) ::
>> test_add_listener_to_broadcaster_with_dsym (TestEvents.EventAPITestCase)
>> (requires Darwin) 
>> python: /home/mg11/src/vendor/llvm/tools/lldb/source/Plugins/Process/POSIX/ProcessPOSIX.cpp:270: virtual lldb_private::Error ProcessPOSIX::DoResume(): Assertion `state == eStateStopped' failed.
>> Aborted (core dumped)
>> 
>> 
>> Matt
>> 
>> 
>> On Tue, 2014-10-21 at 10:50 +0100, Matthew Gardiner wrote:
>>> Hi all,
>>> 
>>> In a build on 64-bit linux from TOT, I'm experiencing the test case
>>> "TestEvents" causing python to segfault.
>>> 
>>> I believe this to be a fairly recent regression. Anyone else seeing
>>> this/or know what's responsible?
>>> 
>>> I'm starting to analyse this...
>>> 
>>> Matt
>>> 
>>> 
>>> 
>>> 
>>> 
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