dm cache: fix leaking of deferred bio prison cells

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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 <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # 4.1+

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Joe Thornber 2015-08-31 18:20:08 +01:00 • committed by Mike Snitzer

parent f15f4d7200

commit 9153df7405

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drivers/md/dm-cache-target.c

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