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Date: Wed, 22 Sep 2010 15:30:06 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: Andi Kleen <andi@...stfloor.org> Cc: netdev@...r.kernel.org Subject: Re: linux/netpoll.h:67 invoked rcu_dereference warning at boot Le mercredi 22 septembre 2010 à 15:20 +0200, Andi Kleen a écrit : > 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 > > Thanks Andi I believe I sent a patch this morning http://lkml.org/lkml/2010/9/22/35 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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