From: Eric Dumazet <eric.dumazet@gmail.com>
To: netdev <netdev@vger.kernel.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: [BUG net-next-2.6] fib: Some rcu warning
Date: Wed, 14 Apr 2010 21:54:04 +0200 [thread overview]
Message-ID: <1271274844.16881.1743.camel@edumazet-laptop> (raw)
[ 27.756998] IPv4 FIB: Using LC-trie version 0.409
[ 27.757121]
[ 27.757121] ===================================================
[ 27.757228] [ INFO: suspicious rcu_dereference_check() usage. ]
[ 27.757285] ---------------------------------------------------
[ 27.757342] net/ipv4/fib_trie.c:212 invoked rcu_dereference_check()
without protection!
[ 27.757417]
[ 27.757417] other info that might help us debug this:
[ 27.757418]
[ 27.757569]
[ 27.757570] rcu_scheduler_active = 1, debug_locks = 0
[ 27.757674] 2 locks held by ip/5686:
[ 27.757727] #0: (rtnl_mutex){+.+.+.}, at: [<ffffffff8134d247>]
rtnl_lock+0x17/0x20
[ 27.757936] #1: ((inetaddr_chain).rwsem){.+.+.+}, at:
[<ffffffff810654a7>] __blocking_notifier_call_chain+0x47/0x90
[ 27.758148]
[ 27.758149] stack backtrace:
[ 27.758249] Pid: 5686, comm: ip Not tainted
2.6.34-rc3-03164-gb4bf665-dirty #10
[ 27.758323] Call Trace:
[ 27.758377] [<ffffffff81071b4f>] lockdep_rcu_dereference+0xaf/0xc0
[ 27.758437] [<ffffffff813ae32c>] fib_find_node+0x19c/0x220
[ 27.758495] [<ffffffff813b0bdc>] fib_table_insert+0xac/0x760
[ 27.758552] [<ffffffff813aa121>] ? fib_get_table+0x91/0xd0
[ 27.758609] [<ffffffff813aa0b8>] ? fib_get_table+0x28/0xd0
[ 27.758667] [<ffffffff813aa561>] fib_magic+0x111/0x120
[ 27.758723] [<ffffffff813aa6a0>] fib_add_ifaddr+0x130/0x170
[ 27.758780] [<ffffffff813aad3c>] fib_inetaddr_event+0x5c/0x290
[ 27.758838] [<ffffffff810650d8>] notifier_call_chain+0x58/0x80
[ 27.758896] [<ffffffff810654bd>] __blocking_notifier_call_chain
+0x5d/0x90
[ 27.758956] [<ffffffff81065506>] blocking_notifier_call_chain
+0x16/0x20
[ 27.759016] [<ffffffff813a0c44>] __inet_insert_ifa+0xd4/0x170
[ 27.759089] [<ffffffff813a0cf2>] inet_insert_ifa+0x12/0x20
[ 27.759146] [<ffffffff813a2140>] inetdev_event+0x400/0x430
[ 27.759204] [<ffffffff81362472>] ? netlink_broadcast+0x262/0x3f0
[ 27.759263] [<ffffffff81351391>] ? fib_rules_event+0x21/0x180
[ 27.759320] [<ffffffff810650d8>] notifier_call_chain+0x58/0x80
[ 27.759378] [<ffffffff8106512e>] __raw_notifier_call_chain+0xe/0x10
[ 27.759436] [<ffffffff81065146>] raw_notifier_call_chain+0x16/0x20
[ 27.761102] [<ffffffff8133fc1b>] call_netdevice_notifiers+0x1b/0x20
[ 27.761161] [<ffffffff8133ffad>] __dev_notify_flags+0x7d/0x90
[ 27.761219] [<ffffffff81340005>] dev_change_flags+0x45/0x70
[ 27.761278] [<ffffffff813a2e79>] devinet_ioctl+0x5e9/0x770
[ 27.761336] [<ffffffff813a36b1>] inet_ioctl+0x61/0x80
[ 27.761392] [<ffffffff8132c532>] sock_do_ioctl+0x32/0x60
[ 27.761449] [<ffffffff8132d06c>] compat_sock_ioctl+0x89c/0xb60
[ 27.761507] [<ffffffff81075816>] ? __lock_acquire+0x486/0xaf0
[ 27.761567] [<ffffffff810cbfeb>] ? __do_fault+0x12b/0x480
[ 27.761624] [<ffffffff810b4a93>] ? filemap_fault+0xd3/0x3d0
[ 27.761683] [<ffffffff810f7104>] ? fget_light+0x174/0x360
[ 27.761740] [<ffffffff810cc1f9>] ? __do_fault+0x339/0x480
[ 27.761798] [<ffffffff811370e3>] compat_sys_ioctl+0xd3/0x1900
[ 27.761856] [<ffffffff810ce28a>] ? handle_mm_fault+0x19a/0x780
[ 27.761915] [<ffffffff81023832>] ? do_page_fault+0xe2/0x3b0
[ 27.761972] [<ffffffff81064703>] ? up_read+0x23/0x40
[ 27.762028] [<ffffffff810238f5>] ? do_page_fault+0x1a5/0x3b0
[ 27.762087] [<ffffffff813f36cb>] ? _raw_spin_unlock+0x2b/0x40
[ 27.762145] [<ffffffff810f3508>] ? fd_install+0xa8/0xe0
[ 27.762202] [<ffffffff8132eced>] ? sock_map_fd+0x2d/0x40
[ 27.762259] [<ffffffff813f3a69>] ? retint_swapgs+0xe/0x13
[ 27.762331] [<ffffffff8107292d>] ? trace_hardirqs_on_caller
+0x10d/0x190
[ 27.762391] [<ffffffff813f2d21>] ? trace_hardirqs_off_thunk
+0x3a/0x3c
[ 27.762450] [<ffffffff81028b64>] sysenter_dispatch+0x7/0x30
[ 27.762507] [<ffffffff813f2ce2>] ? trace_hardirqs_on_thunk+0x3a/0x3f
next reply other threads:[~2010-04-14 19:54 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-14 19:54 Eric Dumazet [this message]
2010-04-14 20:10 ` [BUG net-next-2.6] fib: Some rcu warning Eric Dumazet
2010-04-14 23:12 ` David Miller
2010-04-14 20:33 ` Paul E. McKenney
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