Re: [Qemu-devel] Regression with commit 095497ffc66b7f031

[Gerd Hoffmann]

On Fr, 2016-07-15 at 12:02 +0200, Paolo Bonzini wrote:
> 
> On 15/07/2016 10:47, Juergen Gross wrote:
> > Nothing scaring and no real difference between working and not working
> > variant.
> > 
> > Meanwhile I've been digging a little bit deeper and found the reason:
> > libxenstore is setting up a reader thread which is waiting for the
> > watch to fire. With above commit the stack size of that thread (16kB)
> > is too small. Setting it to 32kB made qemu work again.
> 
> This makes very little sense (not your fault)...  The commit doesn't
> change stack usage at all, TLS should not be on the stack.
> 
> Can you capture a backtrace where the 16K stack is exceeded?  Perhaps
> it's only due to inlining decision on the compiler, in which case
> Peter's patch from today is only a bandaid.

Hmm, I guess I hold off the vnc pull request for now ...

cheers,
  Gerd