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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2014-02-24 at 14:53 +0000, M A Young wrote:
> 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).

OK, thanks for clarifying!

Ian.


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel