Re: [Xen-devel] ntp hangs CPU1

[Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>]

> I'm running debian/testing.  That particular guest was not entirely
> up-to-date, running  ntp-4.0.99g / libc-2.3.1
> 
> So I updated it to ntp-4.1.2a / libc-2.3.2  and the problem has gone away.
> Now I can restart ntpd on either cpu.

Bizarre. 

We mostly use RH9 which is ntp-4.1.2 and libc-2.3.2.

It's hard to understand why the CPU the domain is running on
makes a difference with ntp-4.0.99. There's obviously a
Xen/Xenolinux bug that this particular versions tickles...

If you've got a serial line connected, please can you try hitting
'q' when you've got a couple of domains in the dead state. That
should at least tell us whether they're looping or waiting for an
event.

It might be worth doing the following to see if the system calls
are any different between the two ntp versions, and also to see
what the system call before the hang is:
 strace ntpd [args] >/dev/console 2>&1


Cheers,
Ian



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