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| author | Jakub Kicinski <kuba@kernel.org> | 2021-12-10 06:38:30 -0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-12-10 06:38:30 -0800 |
| commit | 3d20408dff9c0885591c8e1d31a67e9183f0cc8a (patch) | |
| tree | 509db89a9091f6bbdd5dd5bafb19ed3298ddb494 /net/Kconfig.debug | |
| parent | e5d75fc20b9278d07731f69e327adf16227813a6 (diff) | |
| parent | 11b311a867b6b3208fdc3cee8a780f14659bf5f9 (diff) | |
Merge branch 'net-netns-refcount-tracking-base-series'
Eric Dumazet says:
====================
net: netns refcount tracking, base series
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().
Small sections of codes where the get()/put() are in sight
do not need to have a tracker, because they are short lived,
but in theory it is also possible to declare an on-stack tracker.
v2: Include core networking patches only.
====================
Link: https://lore.kernel.org/r/20211210074426.279563-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/Kconfig.debug')
| -rw-r--r-- | net/Kconfig.debug | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/net/Kconfig.debug b/net/Kconfig.debug index fb5c70e01cb3..2f50611df858 100644 --- a/net/Kconfig.debug +++ b/net/Kconfig.debug @@ -8,3 +8,12 @@ config NET_DEV_REFCNT_TRACKER 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. |