[Bugs] [Bug 1302199] Scrubber crash (list corruption)

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1302199



--- Comment #1 from Venky Shankar <vshankar at redhat.com> ---
_br_scrubber_find_scrubbable_entry() does a pthread_cond_wait(...) to get
signalled when ->scrublist is non-empty:

    if (list_empty (&fsscrub->scrublist))
        pthread_cond_wait (&fsscrub->cond, &fsscrub->mutex);

pthread_cond_wait() is prone to spurious wakeups as mentioned in man(3)
pthread_cond_wait and callers are expected to validate the condition again. In
the above case, if pthread_cond_wait() returns prematurely, then accessing
first element of ->scrublist and calling list_entry() would give garbage.

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