lockup in rb_get_reader_page

[Jiaying Zhang]

Hi Steven,

We recently saw some cpu lockups while running kernel tracing.
The problem started to happen after we synced up our ring buffer
code with the upstream lockless ring buffer change. It usually
took many hours and heavy trace load to hit this problem. When
the lockup happens, the problematic cpu seemed to be in an infinite
loop of trying to grab the head_page in rb_get_reader_page().

We would like to check with you on whether this is a known issue.
If so, do we have a bug fix? If not, do you have any suggestions on
where we should check?

Thanks a lot!

Jiaying
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