Oh, the same fix was applied from another developer:
https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-block.git/commit/?h=for-linus&id=f42d79ab67322e51b92dd7aa965e310c71352a64
Yours came first, though I just missed it.
> On 10/02/2015 09:40 PM, Sasha Levin wrote:
> > Commit f26cdc853 ("blk-mq: Shared tag enhancements") has introduced a use
> > after
> > free where it tried to free the cpumask var out of the tag set but the tag
> > set
> > was already freed by blk_mq_free_rq_map().
> >
> > Signed-off-by: Sasha Levin <sasha.le...@oracle.com>
> > ---
> > block/blk-mq-tag.c | 1 +
> > block/blk-mq.c | 7 ++-----
> > 2 files changed, 3 insertions(+), 5 deletions(-)
> >
> > diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
> > index f6020c6..c03eeb8 100644
> > --- a/block/blk-mq-tag.c
> > +++ b/block/blk-mq-tag.c
> > @@ -628,6 +628,7 @@ void blk_mq_free_tags(struct blk_mq_tags *tags)
> > {
> > bt_free(&tags->bitmap_tags);
> > bt_free(&tags->breserved_tags);
> > + free_cpumask_var(tags->cpumask);
> > kfree(tags);
> > }
> >
> > diff --git a/block/blk-mq.c b/block/blk-mq.c
> > index 5692c15..197a615 100644
> > --- a/block/blk-mq.c
> > +++ b/block/blk-mq.c
> > @@ -2270,12 +2270,9 @@ void blk_mq_free_tag_set(struct blk_mq_tag_set *set)
> > {
> > int i;
> >
> > - for (i = 0; i < set->nr_hw_queues; i++) {
> > - if (set->tags[i]) {
> > + for (i = 0; i < set->nr_hw_queues; i++)
> > + if (set->tags[i])
> > blk_mq_free_rq_map(set, set->tags[i], i);
> > - free_cpumask_var(set->tags[i]->cpumask);
> > - }
> > - }
> >
> > kfree(set->tags);
> > set->tags = NULL;
> >
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