Merge branch 'net-sched-race-fix'
Cong Wang says: ==================== net_sched: close the race between call_rcu() and cleanup_net() This patchset tries to fix the race between call_rcu() and cleanup_net() again. Without holding the netns refcnt the tc_action_net_exit() in netns workqueue could be called before filter destroy works in tc filter workqueue. This patchset moves the netns refcnt from tc actions to tcf_exts, without breaking per-netns tc actions. Patch 1 reverts the previous fix, patch 2 introduces two new API's to help to address the bug and the rest patches switch to the new API's. Please see each patch for details. I was not able to reproduce this bug, but now after adding some delay in filter destroy work I manage to trigger the crash. After this patchset, the crash is not reproducible any more and the debugging printk's show the order is expected too. ==================== Fixes: ddf97ccd ("net_sched: add network namespace support for tc actions") Reported-by: Lucas Bates <email@example.com> Cc: Lucas Bates <firstname.lastname@example.org> Cc: Jamal Hadi Salim <email@example.com> Cc: Jiri Pirko <firstname.lastname@example.org> Signed-off-by: Cong Wang <email@example.com> Signed-off-by: David S. Miller <firstname.lastname@example.org>