Marcel,
It's really hard to say anything without reproduction. It might be a
genuine bug in the deoptimizer.
--
Vyacheslav Egorov
On Tue, Oct 11, 2011 at 9:53 PM, Marcel Laverdet <mar...@laverdet.com> wrote:
> Hey there I'm trying to track down an issue with my v8 application (on
> NodeJS). This is on OS X Lion and x64 v8. I've noticed this error on v8
> 3.6.6 and also bleeding_edge.
> The issue is that every now and then I'm seeing this:
> [couldn't find pc offset for node=0]
> [method: Future.wait]
> [source:
> function () {???Future.wait(this);???return this.get();??}
> Bus error: 10
> This error seems to come from deoptimizer.cc and reproducing the error is
> difficult. The only thing strange about my application is that I'm using
> node-fibers [https://github.com/laverdet/node-fibers], which adds coroutine
> support to v8. Each coroutine is actually just a pthread and
> pthread_cond_signal is used to simulate coroutines** which play nicely with
> v8::Locker. So it seems that this issue may be related to threads,
> potentially 100's of threads using the same v8 isolate (locking and
> unlocking where appropriate).
> If I run this instead with a debug build of v8 I get this error:
> #
> # Fatal error in /Users/marcel/code/node/deps/v8/src/objects-inl.h, line
> 2996
> # CHECK(kind() == OPTIMIZED_FUNCTION) failed
> #
> I have NOT been able to reproduce this problem on an ia32 build with the
> same application and machine; it seems to be just x64.
> I'm wondering where I should start looking from here. Is this a bug in v8,
> should I work on distilling a test case for you guys?
> ** Actually the default version of node-fibers uses some not-supported v8
> hacking to get true coroutines, but you can modify the build to use pthreads
> instead which is totally within the confines of v8's API. All my testing was
> done with the pthread_cond_signal version of node-fibers.
>
> --
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> v8-users@googlegroups.com
> http://groups.google.com/group/v8-users
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