On Thu, Dec 03, 2020 at 01:59:07PM -0800, Jonathan Lemon wrote:
> From: Jonathan Lemon <b...@fb.com>
>
> If unable to obtain the file structure for the current task,
> proceed to the next task number after the one returned from
> task_seq_get_next(), instead of the next task number from the
> original iterator.
>
> Use thread_group_leader() instead of comparing tgid vs pid, which
> might may be racy.
>
> Only obtain the task reference count at the end of the RCU section
> instead of repeatedly obtaining/releasing it when iterathing though
> a thread group.
>
> This patch fixes a recurring RCU stall seen from task_file_seq_next().
>
> Fixes: a650da2ee52a ("bpf: Add task and task/file iterator targets")
> Fixes: 67b6b863e6ab ("bpf: Avoid iterating duplicated files for task_file
> iterator")
There are no such sha-s in bpf-next tree. Pls fix.
