From: Wolfgang Bumiller
Date: Thu, 12 Apr 2018 10:46:55 +0200
> When coming from ndisc_netdev_event() in net/ipv6/ndisc.c,
> neigh_ifdown() is called with &nd_tbl, locking this while
> clearing the proxy neighbor entries when eg. deleting an
> interface. Calling the table's pndisc_destructor() wi
When coming from ndisc_netdev_event() in net/ipv6/ndisc.c,
neigh_ifdown() is called with &nd_tbl, locking this while
clearing the proxy neighbor entries when eg. deleting an
interface. Calling the table's pndisc_destructor() with the
lock still held, however, can cause a deadlock: When a
multicast
