Lars Ellenberg ha scritto:
[60257.728500] ------------[ cut here ]------------
[60257.728500] WARNING: at net/core/skbuff.c:398
skb_release_head_state+0x64/0xc8()
This is _NOT_ and oops.
it is a _WARNING_.
different thing.
Well sorry, but anyway it was a problem :-D
specifically, it is this warning:
static void skb_release_head_state(struct sk_buff *skb)
{
skb_dst_drop(skb);
#ifdef CONFIG_XFRM
secpath_put(skb->sp);
#endif
if (skb->destructor) {
WARN_ON(in_irq()); <=====
skb->destructor(skb);
}
so apparently virtio_net does something
that skb_release_head_state does not expect,
namely destruct from irq context.
No, I don't think DRBD has anything in particular to do with these
warnings, we do not touch skbs directly.
If it comes down to pointing fingers,
from the information at hand, it looks like an issue with virtio_net.
Thanks, Lars.
You're right.
It seems to be a problemin virtio_net.
See this post: http://marc.info/?l=linux-netdev&m=125542939211671
where Eric Dumazet points out the problem and proposes a patch.
I'm testing it right now.
possibly it is even because you try to use netconsole and virtio_net
at the same time, and they do interfere?
No, i added netconsole because the server was rebooting (drbd was
loosing sync and was triggering a reboot).
The problem was there before netcosole was used.
using netconsole to debug network issues may not be the smartest move.
don't do that, then ;)
It worked this time, fortunately.
That was only one of the ways i was trying to debug the problem.
It's very weird that no one has noticed that Warning before.
I've been using KVM for a long time and i bet that a lot of users use
DRBD with KVM and virtio drivers like i do.
I hope that that patch has fixed the problem.
Thanks again, Lars.
Max
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