netdev - Re: [ 2375.793397] WARNING: CPU: 0 PID: 1149 at net/netlink/genetlink.c:1037 genl

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Date:	Thu, 15 Jan 2015 14:01:08 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Jeff Layton <jeff.layton@...marydata.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [ 2375.793397] WARNING: CPU: 0 PID: 1149 at
 net/netlink/genetlink.c:1037 genl_unbind+0xc0/0xd0()

On Thu, 2015-01-15 at 07:49 -0500, Jeff Layton wrote:

> It may have. I just recently started playing with trinity, so I don't
> know much about what it does. I do see these sorts of messages in the
> logs that imply that it's opening netlink sockets:
> 
> [main] fd[661] = domain:16 (PF_NETLINK) type:0x2 protocol:10
> [main] fd[675] = domain:16 (PF_NETLINK) type:0x2 protocol:0
> 
> ...and then it does random I/Os on those fds.

Yes. We're looking for generic netlink, so one of these (protocol 16):

[main] fd[427] = domain:16 (PF_NETLINK) type:0x3 protocol:16
[main] fd[442] = domain:16 (PF_NETLINK) type:0x2 protocol:16
[main] fd[774] = domain:16 (PF_NETLINK) type:0x2 protocol:16

However, I didn't see much happening on these fds, and even if it
wouldn't have recorded the kind of messages.

OTOH, multicast group stuff is done with setsockopt() and/or bind, which
I didn't really find here?

> FWIW, it tries to call delete_module, but I was running this as an
> unprivileged user so I don't think that can succeed.

Ok.

johannes

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