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| author | Eric Dumazet <edumazet@google.com> | 2021-12-10 10:44:21 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-12-10 17:38:26 +0300 |
| commit | 9ba74e6c9e9d0c5c1e5792a7111fc7d1a0589cb8 (patch) | |
| tree | 0984bfcc460de30d23f22d4230992964496199da /net/Kconfig.debug | |
| parent | e5d75fc20b9278d07731f69e327adf16227813a6 (diff) | |
| download | linux-9ba74e6c9e9d0c5c1e5792a7111fc7d1a0589cb8.tar.xz | |
net: add networking namespace refcount tracker
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>
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. |