[mythtv-users] MythBackend Suddenly swamping CPU on system
kpyle at austin.rr.com
Tue Jul 3 02:44:58 UTC 2012
On 07/02/12 02:51, Niklas Brunlid wrote:
> On 1 July 2012 19:30, Robert M. Riches Jr.<rm.riches at jacob21819.net> wrote:
>> > On Sun, 01 Jul 2012 11:07:54 +0200, Jan Ceuleers wrote:
>>> > > Seems to be caused by the leap second insertion which happened overnight
>>> > > (UTC).
>> > At least on my system (backend and frontend on same system), it
>> > seemed connected to mysqld. ...
> Exactly this happened to me, too. Though Firefox showed the same behavior
> as mysqld.
> Also, while I could start mythfrontend, it responded to one key event in
> total over 1-2 minutes but was otherwise frozen.
> A reboot solved the problem.
I've been following the issue on the Linux Kernel Mailing List
(lkml.org). The experience of those on this list is exactly consistent
with the leap second bug. The problem will be most apparent for
programs that use timers for things like a futex wait. mysqld and
firefox are perfect examples. The problem was likely introduced around
kernel 2.6.22 and has been confirmed present all the way to 3.5. For
the gory details by one of the folks working on a patch, see
The good news is that you don't have to worry about this problem again
until the next leap second, in three years or so. Presumably, there
will be a patch somewhat sooner. :-)
More information about the mythtv-users