diff options
| author | Eric Dumazet <edumazet@google.com> | 2021-12-05 07:21:57 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-12-07 03:05:07 +0300 |
| commit | 4d92b95ff2f95f13df9bad0b5a25a9f60e72758d (patch) | |
| tree | 0e0fa4c1662c49b683170ed02da58ab253da23d7 /lib | |
| parent | 914a7b5000d08f1487e0efa52f27c4b7ea75b893 (diff) | |
| download | linux-4d92b95ff2f95f13df9bad0b5a25a9f60e72758d.tar.xz | |
net: add net device refcount tracker infrastructure
net device are refcounted. Over the years we had numerous bugs
caused by imbalanced dev_hold() and dev_put() calls.
The general idea is to be able to precisely pair each decrement with
a corresponding prior increment. Both share a cookie, basically
a pointer to private data storing stack traces.
This patch adds dev_hold_track() and dev_put_track().
To use these helpers, each data structure owning a refcount
should also use a "netdevice_tracker" to pair the hold and put.
netdevice_tracker dev_tracker;
...
dev_hold_track(dev, &dev_tracker, GFP_ATOMIC);
...
dev_put_track(dev, &dev_tracker);
Whenever a leak happens, we will get precise stack traces
of the point dev_hold_track() happened, at device dismantle phase.
We will also get a stack trace if too many dev_put_track() for the same
netdevice_tracker are attempted.
This is guarded by CONFIG_NET_DEV_REFCNT_TRACKER option.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 633c2c5cb45b..6504b97f8dfd 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -598,6 +598,11 @@ config DEBUG_MISC Say Y here if you need to enable miscellaneous debug code that should be under a more specific debug option but isn't. +menu "Networking Debugging" + +source "net/Kconfig.debug" + +endmenu # "Networking Debugging" menu "Memory Debugging" |