From: Andi Kleen <andi@firstfloor.org>
To: netdev@vger.kernel.org
Subject: linux/netpoll.h:67 invoked rcu_dereference warning at boot
Date: Wed, 22 Sep 2010 15:20:15 +0200 [thread overview]
Message-ID: <20100922132014.GA8853@basil.fritz.box> (raw)
When booting a recent Linus tree with debugging enabled I get
the following warning at boot.
I haven't looked into it closely.
-Andi
===================================================
[ INFO: suspicious rcu_dereference_check() usage. ]
---------------------------------------------------
/home/lsrc/git/linux-work2/include/linux/netpoll.h:67 invoked rcu_dereferenceeck() without protection!
other info that might help us debug this:
rcu_scheduler_active = 1, debug_locks = 1
1 lock held by iceccd/2574:
#0: (sk_lock-AF_INET){+.+.+.}, at: [<ffffffff81721bf9>] udp_sendmsg+0x289/00
stack backtrace:
Pid: 2574, comm: iceccd Not tainted 2.6.36-rc4-00228-g5647824 #1
Call Trace:
[<ffffffff81090a24>] lockdep_rcu_dereference+0xa4/0xc0
[<ffffffff816d3475>] netif_rx+0x215/0x240
[<ffffffff81135fbf>] ? cache_alloc_debugcheck_after+0x5f/0x280
[<ffffffff8104cc61>] ? get_parent_ip+0x11/0x50
[<ffffffff816d36b3>] netif_rx_ni+0x23/0x80
[<ffffffff816fd3f3>] ip_dev_loopback_xmit+0x83/0xf0
[<ffffffff816fddfa>] ip_mc_output+0x18a/0x220
[<ffffffff816fd53d>] ip_local_out+0x2d/0x80
[<ffffffff816ff414>] ip_push_pending_frames+0x284/0x420
[<ffffffff81720586>] udp_push_pending_frames+0x146/0x3e0
[<ffffffff81721bf9>] ? udp_sendmsg+0x289/0x720
[<ffffffff81721de4>] udp_sendmsg+0x474/0x720
[<ffffffff8105ec82>] ? local_bh_enable_ip+0x82/0x100
[<ffffffff8172aee4>] inet_sendmsg+0xc4/0x160
[<ffffffff8172ae20>] ? inet_sendmsg+0x0/0x160
[<ffffffff816bddd0>] sock_sendmsg+0xc0/0xf0
[<ffffffff8110e03a>] ? might_fault+0x7a/0xd0
[<ffffffff8110e03a>] ? might_fault+0x7a/0xd0
[<ffffffff8110e083>] ? might_fault+0xc3/0xd0
[<ffffffff8110e03a>] ? might_fault+0x7a/0xd0
[<ffffffff816bfe80>] ? move_addr_to_kernel+0x50/0x60
[<ffffffff816c0ba5>] sys_sendto+0xf5/0x130
[<ffffffff8100311b>] system_call_fastpath+0x16/0x1b
--
ak@linux.intel.com -- Speaking for myself only.
next reply other threads:[~2010-09-22 13:20 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-22 13:20 Andi Kleen [this message]
2010-09-22 13:30 ` linux/netpoll.h:67 invoked rcu_dereference warning at boot Eric Dumazet
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