On Mon, Jun 06, 2016 at 12:09:49PM -0500, Shaun Tancheff wrote:
> I'm pretty sure it is missing a bio_put() after submit_bio_wait().
>
> Please excuse the hack-y patch but I think you need to do something
> like this ...
> (Note tabs eaten by gmail).
>
> diff --git a/block/blk-lib.c b/block/blk-lib.c
> index 23d7f30..9e29dc3 100644
> --- a/block/blk-lib.c
> +++ b/block/blk-lib.c
> @@ -113,6 +113,7 @@ int blkdev_issue_discard(struct block_device
> *bdev, sector_t sector,
> ret = submit_bio_wait(type, bio);
> if (ret == -EOPNOTSUPP)
> ret = 0;
> + bio_put(bio);
> }
> blk_finish_plug(&plug);
>
> @@ -165,8 +166,10 @@ int blkdev_issue_write_same(struct block_device
> *bdev, sector_t sector,
> }
> }
>
> - if (bio)
> + if (bio) {
> ret = submit_bio_wait(REQ_WRITE | REQ_WRITE_SAME, bio);
> + bio_put(bio);
> + }
> return ret != -EOPNOTSUPP ? ret : 0;
> }
> EXPORT_SYMBOL(blkdev_issue_write_same);
> @@ -206,8 +209,11 @@ static int __blkdev_issue_zeroout(struct
> block_device *bdev, sector_t sector,
> }
> }
>
> - if (bio)
> - return submit_bio_wait(WRITE, bio);
> + if (bio) {
> + ret = submit_bio_wait(WRITE, bio);
> + bio_put(bio);
> + return ret;
> + }
> return 0;
> }
This patch appears to fix the memory leak on my machine.
Tested-by: Catalin Marinas <catalin.marinas@xxxxxxx>
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