net: force a reload of first item in hlist_nulls_for_each_entry_rcu
authorEric Dumazet <eric.dumazet@gmail.com>
Wed, 29 May 2013 09:06:27 +0000 (09:06 +0000)
committerDavid S. Miller <davem@davemloft.net>
Mon, 3 Jun 2013 03:53:59 +0000 (20:53 -0700)
commitc87a124a5d5e8cf8e21c4363c3372bcaf53ea190
tree291681da6b67bc52bf92703f895070eb8b772a8c
parentc802db1164f28e62c6a43132b8d290cb8113f2ac
net: force a reload of first item in hlist_nulls_for_each_entry_rcu

Roman Gushchin discovered that udp4_lib_lookup2() was not reloading
first item in the rcu protected list, in case the loop was restarted.

This produced soft lockups as in https://lkml.org/lkml/2013/4/16/37

rcu_dereference(X)/ACCESS_ONCE(X) seem to not work as intended if X is
ptr->field :

In some cases, gcc caches the value or ptr->field in a register.

Use a barrier() to disallow such caching, as documented in
Documentation/atomic_ops.txt line 114

Thanks a lot to Roman for providing analysis and numerous patches.

Diagnosed-by: Roman Gushchin <klamm@yandex-team.ru>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Boris Zhmurov <zhmurov@yandex-team.ru>
Signed-off-by: Roman Gushchin <klamm@yandex-team.ru>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/linux/rculist_nulls.h