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| author | Andy Gospodarek <gospo@cumulusnetworks.com> | 2015-06-26 19:37:11 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-06-28 16:47:12 -0700 |
| commit | 96ac5cc9636318e7d92e72a3f1032456152a3a2f (patch) | |
| tree | 1be027c89e4701f90be1a88221633b833b6c785c /net | |
| parent | 7d967b673c2ff992205be051ffebc39e1a323400 (diff) | |
| download | lwn-96ac5cc9636318e7d92e72a3f1032456152a3a2f.tar.gz lwn-96ac5cc9636318e7d92e72a3f1032456152a3a2f.zip | |
ipv4: fix RCU lockdep warning from linkdown changes
The following lockdep splat was seen due to the wrong context for
grabbing in_dev.
===============================
[ INFO: suspicious RCU usage. ]
4.1.0-next-20150626-dbg-00020-g54a6d91-dirty #244 Not tainted
-------------------------------
include/linux/inetdevice.h:205 suspicious rcu_dereference_check() usage!
other info that might help us debug this:
rcu_scheduler_active = 1, debug_locks = 0
2 locks held by ip/403:
#0: (rtnl_mutex){+.+.+.}, at: [<ffffffff81453305>] rtnl_lock+0x17/0x19
#1: ((inetaddr_chain).rwsem){.+.+.+}, at: [<ffffffff8105c327>] __blocking_notifier_call_chain+0x35/0x6a
stack backtrace:
CPU: 2 PID: 403 Comm: ip Not tainted 4.1.0-next-20150626-dbg-00020-g54a6d91-dirty #244
0000000000000001 ffff8800b189b728 ffffffff8150a542 ffffffff8107a8b3
ffff880037bbea40 ffff8800b189b758 ffffffff8107cb74 ffff8800379dbd00
ffff8800bec85800 ffff8800bf9e13c0 00000000000000ff ffff8800b189b7d8
Call Trace:
[<ffffffff8150a542>] dump_stack+0x4c/0x6e
[<ffffffff8107a8b3>] ? up+0x39/0x3e
[<ffffffff8107cb74>] lockdep_rcu_suspicious+0xf7/0x100
[<ffffffff814b63c3>] fib_dump_info+0x227/0x3e2
[<ffffffff814b6624>] rtmsg_fib+0xa6/0x116
[<ffffffff814b978f>] fib_table_insert+0x316/0x355
[<ffffffff814b362e>] fib_magic+0xb7/0xc7
[<ffffffff814b4803>] fib_add_ifaddr+0xb1/0x13b
[<ffffffff814b4d09>] fib_inetaddr_event+0x36/0x90
[<ffffffff8105c086>] notifier_call_chain+0x4c/0x71
[<ffffffff8105c340>] __blocking_notifier_call_chain+0x4e/0x6a
[<ffffffff8105c370>] blocking_notifier_call_chain+0x14/0x16
[<ffffffff814a7f50>] __inet_insert_ifa+0x1a5/0x1b3
[<ffffffff814a894d>] inet_rtm_newaddr+0x350/0x35f
[<ffffffff81457866>] rtnetlink_rcv_msg+0x17b/0x18a
[<ffffffff8107e7c3>] ? trace_hardirqs_on+0xd/0xf
[<ffffffff8146965f>] ? netlink_deliver_tap+0x1cb/0x1f7
[<ffffffff814576eb>] ? rtnl_newlink+0x72a/0x72a
...
This patch resolves that splat.
Signed-off-by: Andy Gospodarek <gospo@cumulusnetworks.com>
Reported-by: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/fib_semantics.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c index 3bfccd83551c..c7358ea4ae93 100644 --- a/net/ipv4/fib_semantics.c +++ b/net/ipv4/fib_semantics.c @@ -1045,7 +1045,7 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event, nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif)) goto nla_put_failure; if (fi->fib_nh->nh_flags & RTNH_F_LINKDOWN) { - in_dev = __in_dev_get_rcu(fi->fib_nh->nh_dev); + in_dev = __in_dev_get_rtnl(fi->fib_nh->nh_dev); if (in_dev && IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) rtm->rtm_flags |= RTNH_F_DEAD; @@ -1074,7 +1074,7 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event, rtnh->rtnh_flags = nh->nh_flags & 0xFF; if (nh->nh_flags & RTNH_F_LINKDOWN) { - in_dev = __in_dev_get_rcu(nh->nh_dev); + in_dev = __in_dev_get_rtnl(nh->nh_dev); if (in_dev && IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) rtnh->rtnh_flags |= RTNH_F_DEAD; |