[OpenAFS-devel] LWP and clang

[Marc Dionne]

On Wed, Oct 16, 2013 at 2:00 PM, Benjamin Kaduk <kaduk@mit.edu> wrote:
> On Wed, 16 Oct 2013, Marc Dionne wrote:
>
>> On Wed, Oct 16, 2013 at 1:26 PM, Benjamin Kaduk <kaduk@mit.edu> wrote:
>>>
>>> Hi all,
>>>
>>> I've been seeing lots of runtime crashes when running clang-compiled
>>> LWP-using binaries, for several months now at least.  My experiences have
>>
>>
>> Anything interesting about where the crashes occur - in the lwp
>> functions themselves (savecontext, etc.) ?  and does it crash every
>> time it is switching lwps or are these sporadic?
>
>
> I only remember crashes that reliably occur at program startup, perhaps even
> before switching LWPs.
>
> Hmm, the example I have handy (aklog.core from ~tip-of-1.6.x) shows the
> faulting line of source as:
> rx_lwp.c:174:
> 174     char name[MAXTHREADNAMELENGTH] = "srv_0";

Crashing here which is probably the first write into stack memory
after starting the rx_ListenerProc LWP, so that would seem consistent
with having a bogus stack pointer after switching lwps.

Marc