[lxc-devel] setns/fork(glibc) weird interaction, lxc-attach may hang sporadically

[Dwight Engen]

On Tue, 23 Apr 2013 12:55:49 -0400
Dwight Engen <dwight.engen at oracle.com> wrote:

> On Tue, 23 Apr 2013 15:03:49 +0100
> Christian Seiler <christian at iwakd.de> wrote:
[...] 
> > The question is: What do we do to resolve the other problem? I don't
> > think the assert in glibc() in an by itself should necessarily go
> > away, because in the vast, vast, vast majority of cases the check is
> > very reasonable.
> > 
> > The long-term solution for glibc could be to also wrap setns() to
> > remember if it was called to enter a new pidns and in that case not
> > to do the check, but otherwise still do it.
> > 
> > But we don't know against what version of glibc lxc-attach is going
> > to be build, so we need a better solution in the short term:
> 
> Hi Christian, I agree we need a short term solution and one that works
> with existing glibcs. My question is if you think that glibc will
> eventually fix this at some point? I pulled down the most recent
> core-utils to see if/how they had worked around it but it looks to me
> like nsenter could possibly run into the same thing unless -F is
> given. I can try to reproduce the hang with nsenter, which might help
> encourage glibc to fix it sooner :)

Sorry, I meant util-linux, not core-utils.