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BUG/MEDIUM: threads/stick-tables: close a race condition on stktable_trash_expired()

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The spin_unlock() was called just before setting the expiry to
TICK_ETERNITY, so if another thread has the time to perform its
update and set a timeout, this would would clear it.
This commit is contained in:
Willy Tarreau 2017-11-05 11:04:47 +01:00
parent 03071f6937
commit 4d5f13cab3
1 changed files with 3 additions and 3 deletions
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6
src/stick_table.c
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@ -536,8 +536,7 @@ static int stktable_trash_expired(struct stktable *t)
if (likely(tick_is_lt(now_ms, eb->key))) {
/* timer not expired yet, revisit it later */
t->exp_next = eb->key;
SPIN_UNLOCK(STK_TABLE_LOCK, &t->lock);
return t->exp_next;
goto out_unlock;
}
/* timer looks expired, detach it from the queue */
@ -567,10 +566,11 @@ static int stktable_trash_expired(struct stktable *t)
eb32_delete(&ts->upd);
__stksess_free(t, ts);
}
SPIN_UNLOCK(STK_TABLE_LOCK, &t->lock);
/* We have found no task to expire in any tree */
t->exp_next = TICK_ETERNITY;
out_unlock:
SPIN_UNLOCK(STK_TABLE_LOCK, &t->lock);
return t->exp_next;
}