Re: [Libunwind-devel] [PATCH 6/8] Recognise and unwind through PLT.

[Lassi Tuura]

Hi,

> start ip=7ffff766a4b2 [... missing epiologue unwind info ...] So the change 
> to %rsp at  0006a4b2 is missing unwind information.

Right, that's the "no unwind info in epilogue" issue. That will be fixed when 
your lib{c,m,dl} + ld-linux will be rebuilt with GCC 4.5.0+. We see these at 
0.5% level when profiling our applications, and I am afraid there's not much 
that can be done to fix them.

> Probably fixed in the Ubuntu release you're testing with.

No... I do get the same errors in the other tests, but not the ones you had 
fail. I don't have a physical x86_64 machine with Ubuntu to test with, I used a 
virtual machine. Many of the failures seem to originate from asynchronous 
dual-process tests, and the failures move around from run to run, so maybe the 
VM affects the process interaction and whether the failure hits.

Anyway glad you figured it out.

> I'm going to ignore this issue and push your first patchset to git hopefully 
> soon.

Hurrah :-) Thanks a lot.

Lassi