Problem with 2.6.35.4-12.fc14.x86_64

[Morten P.D. Stevens]

> -----Original Message-----
> From: devel-bounces at lists.fedoraproject.org [mailto:devel-
> bounces at lists.fedoraproject.org] On Behalf Of Michal Schmidt
> Sent: Wednesday, September 15, 2010 8:03 PM
> To: devel at lists.fedoraproject.org
> Subject: Re: Problem with 2.6.35.4-12.fc14.x86_64
> 
> On Wed, 15 Sep 2010 17:44:47 +0200 Morten P.D. Stevens wrote:
> > Does anyone know something about this issue?
> >[...]
> > ===================================================
> > [ INFO: suspicious rcu_dereference_check() usage. ]
> > ---------------------------------------------------
> > kernel/sched.c:616 invoked rcu_dereference_check() without
> protection!
> 
> Try kernel >= 2.6.35.4-21 from Koji. It has this change

Hi Michael,

The same problem with the newest 2.6.35.4-28.fc14.x86_64 kernel.

===================================================
[ INFO: suspicious rcu_dereference_check() usage. ]
---------------------------------------------------
include/linux/cgroup.h:542 invoked rcu_dereference_check() without protection!

other info that might help us debug this:


rcu_scheduler_active = 1, debug_locks = 0
1 lock held by swapper/1:
 #0:  (net_mutex){+.+.+.}, at: [<ffffffff813e9010>] register_pernet_subsys+0x1f/0x47

stack backtrace:
Pid: 1, comm: swapper Not tainted 2.6.35.4-28.fc14.x86_64 #1
Call Trace:
 [<ffffffff8107bd3a>] lockdep_rcu_dereference+0xaa/0xb3
 [<ffffffff813e04b9>] sock_update_classid+0x7c/0xa2
 [<ffffffff813e054a>] sk_alloc+0x6b/0x77
 [<ffffffff8140b281>] __netlink_create+0x37/0xab
 [<ffffffff813f941c>] ? rtnetlink_rcv+0x0/0x2d
 [<ffffffff8140cee1>] netlink_kernel_create+0x74/0x19d
 [<ffffffff8149c3ca>] ? __mutex_lock_common+0x339/0x35b
 [<ffffffff813f7e9c>] rtnetlink_net_init+0x2e/0x48
 [<ffffffff813e8d7a>] ops_init+0xe9/0xff
 [<ffffffff813e8f0d>] register_pernet_operations+0xab/0x130
 [<ffffffff813e901f>] register_pernet_subsys+0x2e/0x47
 [<ffffffff81db7bca>] rtnetlink_init+0x53/0x102
 [<ffffffff81db835c>] netlink_proto_init+0x126/0x143
 [<ffffffff81db8236>] ? netlink_proto_init+0x0/0x143
 [<ffffffff810021b8>] do_one_initcall+0x72/0x186
 [<ffffffff81d78ebc>] kernel_init+0x23b/0x2c9
 [<ffffffff8100aae4>] kernel_thread_helper+0x4/0x10
 [<ffffffff8149e2d0>] ? restore_args+0x0/0x30
 [<ffffffff81d78c81>] ? kernel_init+0x0/0x2c9
 [<ffffffff8100aae0>] ? kernel_thread_helper+0x0/0x10

Best regards,

Morten