Re: [Xen-devel] [PATCH 1/3] libxl: Fix libxl_postfork_child_noexec deadlock etc.

[M A Young <m.a.young@xxxxxxxxxxxx>]

On Mon, 24 Feb 2014, Ian Campbell wrote:

> On Mon, 2014-02-24 at 14:19 +0000, Ian Jackson wrote:
> > libxl_postfork_child_noexec would nestedly reaquire the non-recursive
> > "no_forking" mutex: atfork_lock uses it, as does sigchld_user_remove.
> > The result on Linux is that the process always deadlocks before
> > returning from this function.
> >
> > This is used by xl's console child.  So, the ultimate effect is that
> > xl with pygrub does not manage to connect to the pygrub console.
> > This beahviour was reported by Michael Young in Xen 4.4.0 RC5.
> "behaviour".
>
> Michael reported this earlier on -rc2 as well but it fell through the
> cracks because I failed to properly appreciate the severity. Sorry.
No that was a different problem (you get some warnings and a messed 
up terminal sesssion on dom0 after using pygrub). This is a new problem, 
probably introduced in rc4 (which I didn't get around to testing).
        Michael Young

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