On Fri, Sep 18, 2020 at 10:19 PM Francesco Ruggeri <[email protected]> wrote: > > The combination of aca_free_rcu, introduced in commit 2384d02520ff > ("net/ipv6: Add anycast addresses to a global hashtable"), and > fib6_info_destroy_rcu, introduced in commit 9b0a8da8c4c6 ("net/ipv6: > respect rcu grace period before freeing fib6_info"), can result in > an extra rcu grace period being needed when deleting an interface, > with the result that netdev_wait_allrefs ends up hitting the msleep(250), > which is considerably longer than the required grace period. > This can result in long delays when deleting a large number of interfaces, > and it can be observed with this script: > > > > Signed-off-by: Francesco Ruggeri <[email protected]> >
Reviewed-by: Eric Dumazet <[email protected]> Thanks !
