On Mon, Jun 08, 2009 at 03:39:51PM +0900, Minoru Usui wrote: > Hi Thomas > > On Mon, 1 Jun 2009 18:12:01 +0900 > Minoru Usui <usui@xxxxxxxxxxxxxxxxx> wrote: > > > Hi Thomas > > > > Original mail sent to netdev and containers before. > > (http://www.spinics.net/lists/netdev/msg97745.html) > > > > I have a question about how to use cls_cgroup. > > > > On Thu, 21 May 2009 09:22:56 +0900 > > Minoru Usui <usui@xxxxxxxxxxxxxxxxx> wrote: > > > > > Hi > > > > > > Unfortunately this is only panic report. > > > > > > I used cgroup net_cls subsystem, then kernel panic occured. > > > I attach panic message and kernel config in this mail's last paragraph. > > > If my operation is wrong, could you tell me how to use net_cls and > > > where the documentation is. > > > > > > # But I think panic is very bad even if my operation is wrong. > > > > The cause of panic will fix soon. (Now I'll make a patch and will test it.) > > > > I want to know how to use cls_cgroup correctly, so could you tell me how to use it if my operation is wrong. > > Now, I think I might have to specify 'handle' with tc command line, is this true? > > But when I specified 'handle', I faced oops. X-P > > I investigated this problem, and I found a bug in cls_cgroup_change() in cls_cgroup.c. > cls_cgroup_change() expected tca[TCA_OPTIONS] was set from user space properly, > but tc in iproute2-2.6.29-1 (which I used) didn't set it. > > I saw the current source code of tc in git, I found the code for cls_cgroup in iproute2/tc/f_cgroup.c. > It set tca[TCA_OPTIONS]. > > git://git.kernel.org/pub/scm/linux/kernel/git/shemminger/iproute2.git > > # Unfortunately, current source coude of iproute2 couldn't compile, because it occured compile error. X-P > # But this is another issue. > > If we always use a newest iproute2 in git when we use cls_cgroup, we don't face this oops probably. > But I think, kernel shouldn't panic regardless of use program's behaviour. > This patch looks OK to me, but I guess you should add some title (plus "[PATCH]" in the subject), and a changelog (with lines width <= 80). Cheers, Jarek P. > > Signed-off-by: Minoru Usui <usui@xxxxxxxxxxxxxxxxx> > > diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c > index cc29b44..2ec0adc 100644 > --- a/net/sched/cls_cgroup.c > +++ b/net/sched/cls_cgroup.c > @@ -167,6 +167,9 @@ static int cls_cgroup_change(struct tcf_proto *tp, unsigned long base, > struct tcf_exts e; > int err; > > + if (!tca[TCA_OPTIONS]) > + return -EINVAL; > + > if (head == NULL) { > if (!handle) > return -EINVAL; > > > -- > Minoru Usui <usui@xxxxxxxxxxxxxxxxx> _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
