Messages in this thread Patch in this message | | | Date | Fri, 8 Feb 2013 11:19:32 -0800 | From | "Paul E. McKenney" <> | Subject | Re: net: rcu warnings in ip6fl_get_first |
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On Fri, Feb 08, 2013 at 01:38:29AM +0000, Cong Wang wrote: > On Thu, 07 Feb 2013 at 19:32 GMT, Sasha Levin <sasha.levin@oracle.com> wrote: > > Hi guys, > > > > I got the following while fuzzing with trinity inside a KVM tools guest: > > > > [ 51.680236] =============================== > > [ 51.681914] [ INFO: suspicious RCU usage. ] > > [ 51.683610] 3.8.0-rc6-next-20130206-sasha-00028-g83214f7-dirty #276 Tainted: G W > > [ 51.686703] ------------------------------- > > [ 51.688281] net/ipv6/ip6_flowlabel.c:671 suspicious rcu_dereference_check() usage! > > [ 51.691345] > > It should use rcu_dereference_bh()... > > diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c > index ea42bf4..c50080f 100644 > --- a/net/ipv6/ip6_flowlabel.c > +++ b/net/ipv6/ip6_flowlabel.c > @@ -65,13 +65,13 @@ static DEFINE_SPINLOCK(ip6_fl_lock); > static DEFINE_SPINLOCK(ip6_sk_fl_lock); > > #define for_each_fl_rcu(hash, fl) \ > - for (fl = rcu_dereference(fl_ht[(hash)]); \ > + for (fl = rcu_dereference_bh(fl_ht[(hash)]); \ > fl != NULL; \ > - fl = rcu_dereference(fl->next)) > + fl = rcu_dereference_hb(fl->next))
Small but important typo in the preceding line, should be:
+ fl = rcu_dereference_bh(fl->next))
Thanx, Paul
> #define for_each_fl_continue_rcu(fl) \ > - for (fl = rcu_dereference(fl->next); \ > + for (fl = rcu_dereference_bh(fl->next); \ > fl != NULL; \ > - fl = rcu_dereference(fl->next)) > + fl = rcu_dereference_bh(fl->next)) > > #define for_each_sk_fl_rcu(np, sfl) \ > for (sfl = rcu_dereference_bh(np->ipv6_fl_list); \ > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >
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