From: Jakub Kicinski Date: Tue, 7 Dec 2021 00:06:03 +0000 (-0800) Subject: Merge branch 'net-add-preliminary-netdev-refcount-tracking' X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=4c375272fb0ba19288e323928d1f6937e368851f;p=linux.git Merge branch 'net-add-preliminary-netdev-refcount-tracking' Eric Dumazet says: ==================== net: add preliminary netdev refcount tracking Two first patches add a generic infrastructure, that will be used to get tracking of refcount increments/decrements. 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. The third patch adds dev_hold_track() and dev_put_track() helpers (CONFIG_NET_DEV_REFCNT_TRACKER) Then a series of 20 patches converts some dev_hold()/dev_put() pairs to new hepers : dev_hold_track() and dev_put_track(). Hopefully this will be used by developpers and syzbot to root cause bugs that cause netdevice dismantles freezes. With CONFIG_PCPU_DEV_REFCNT=n option, we were able to detect some class of bugs, but too late (when too many dev_put() were happening). Another series will be sent after this one is merged. v3: moved NET_DEV_REFCNT_TRACKER to net/Kconfig.debug added "depends on DEBUG_KERNEL && STACKTRACE_SUPPORT" to hopefully get rid of kbuild reports for ARCH=nios2 Reworded patch 3 changelog. Added missing htmldocs (Jakub) v2: added four additional patches, added netdev_tracker_alloc() and netdev_tracker_free() addressed build error (kernel bots), use GFP_ATOMIC in test_ref_tracker_timer_func() ==================== Link: https://lore.kernel.org/r/20211205042217.982127-1-eric.dumazet@gmail.com Signed-off-by: Jakub Kicinski --- 4c375272fb0ba19288e323928d1f6937e368851f