# SPDX-License-Identifier: GPL-2.0-only
config NET_DEV_REFCNT_TRACKER
bool "Enable net device refcount tracking"
depends on DEBUG_KERNEL && STACKTRACE_SUPPORT
select REF_TRACKER
default n
help
Enable debugging feature to track device references.
This adds memory and cpu costs.
config NET_NS_REFCNT_TRACKER
bool "Enable networking namespace refcount tracking"
depends on DEBUG_KERNEL && STACKTRACE_SUPPORT
select REF_TRACKER
default n
help
Enable debugging feature to track netns references.
This adds memory and cpu costs.-
Eric Dumazet authored
We have 100+ syzbot reports about netns being dismantled too soon, still unresolved as of today. We think a missing get_net() or an extra put_net() is the root cause. In order to find the bug(s), and be able to spot future ones, this patch adds CONFIG_NET_NS_REFCNT_TRACKER and new helpers to precisely pair all put_net() with corresponding get_net(). To use these helpers, each data structure owning a refcount should also use a "netns_tracker" to pair the get and put. Signed-off-by:
Eric Dumazet <edumazet@google.com> Signed-off-by:
Jakub Kicinski <kuba@kernel.org>
9ba74e6c