4.2-stable review patch. If anyone has any objections, please let me know.
------------------ From: Joe Thornber <[email protected]> commit 9153df7405ae04c1b0466de720e0a685cfea1a3a upstream. There were two cases where dm_cell_visit_release() was being called, which removes the cell from the prison's rbtree, but the callers didn't also return the cell to the mempool. Fix this by having them call free_prison_cell(). This leak manifested as the 'kmalloc-96' slab growing until OOM. Fixes: 651f5fa2a3 ("dm cache: defer whole cells") Signed-off-by: Joe Thornber <[email protected]> Signed-off-by: Mike Snitzer <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/md/dm-cache-target.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/md/dm-cache-target.c +++ b/drivers/md/dm-cache-target.c @@ -1729,6 +1729,8 @@ static void remap_cell_to_origin_clear_d remap_to_origin(cache, bio); issue(cache, bio); } + + free_prison_cell(cache, cell); } static void remap_cell_to_cache_dirty(struct cache *cache, struct dm_bio_prison_cell *cell, @@ -1763,6 +1765,8 @@ static void remap_cell_to_cache_dirty(st remap_to_cache(cache, bio, cblock); issue(cache, bio); } + + free_prison_cell(cache, cell); } /*----------------------------------------------------------------*/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
