linux-toradex.git/tools/testing/selftests/net/netdev_lock.py, branch master Linux kernel for Apalis and Colibri modules selftests: net: add test for netdev instance lock ordering on unregister 2026-09-29T11:14:20+00:00 Jakub Kicinski kuba@kernel.org 2026-09-26T04:18:32+00:00 e542bad8d52e0a7f0d47647c2d20612fcdc80c09 Dismantle two netns holding a dummy and a netkit pair registered in opposite order. unregister_netdevice_many_notify() takes the instance locks of all the devices at once, nesting the two kinds of devices one way for the first netns and the other way for the second. With lockdep enabled this used to trigger a circular locking report. Acked-by: Stanislav Fomichev <sdf@fomichev.me> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Link: https://patch.msgid.link/20260926041832.1649675-2-kuba@kernel.org Signed-off-by: Paolo Abeni <pabeni@redhat.com> 
Dismantle two netns holding a dummy and a netkit pair registered in
opposite order. unregister_netdevice_many_notify() takes the instance
locks of all the devices at once, nesting the two kinds of devices one
way for the first netns and the other way for the second. With lockdep
enabled this used to trigger a circular locking report.

Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Link: https://patch.msgid.link/20260926041832.1649675-2-kuba@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>