On Fri, May 3, 2019 at 4:35 PM Douglas Anderson <dianders@xxxxxxxxxxxx> wrote:
>
> If I run the following on rk3288-veyron-minnie (a 2GB machine)
>
> cd /sys/bus/platform/drivers/dwmmc_rockchip
> for i in $(seq 1 3000); do
> echo "========================" $i
> echo ff0f0000.dwmmc > unbind
> sleep .5
> echo ff0f0000.dwmmc > bind
> while true; do
> if [ -e /dev/mmcblk2 ]; then
> break;
> fi
> sleep .1
> done
> done
>
> Then I start OOMing somewhere between iteration 200 and 250. Using
> kmemleak, I see reports like:
>
> unreferenced object 0xe39c5580 (size 64):
> comm "kworker/1:0", pid 17, jiffies 4294821091 (age 96.952s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<ad19d10a>] __kmalloc+0x1ec/0x2dc
> [<a28614c3>] blk_mq_alloc_tag_set+0x27c/0x2bc
> [<0955ae01>] mmc_init_queue+0xa8/0x2a8
> [<5102b986>] mmc_blk_alloc_req+0xf8/0x2d4
> [<f1c2214f>] mmc_blk_probe+0x4a8/0x6c0
> [<0dfdd9d5>] mmc_bus_probe+0x24/0x28
>
> It's pretty clear that we're missing a call to blk_mq_free_tag_set().
> Let's add it.
>
> Fixes: 81196976ed94 ("mmc: block: Add blk-mq support")
> Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Nice one.
Reviewed-by: Guenter Roeck <groeck@xxxxxxxxxxxx>
> ---
>
> drivers/mmc/core/queue.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
> index 7c364a9c4eeb..09071e13282e 100644
> --- a/drivers/mmc/core/queue.c
> +++ b/drivers/mmc/core/queue.c
> @@ -480,6 +480,8 @@ void mmc_cleanup_queue(struct mmc_queue *mq)
> */
> flush_work(&mq->complete_work);
>
> + blk_mq_free_tag_set(&mq->tag_set);
> +
> mq->card = NULL;
> }
>
> --
> 2.21.0.1020.gf2820cf01a-goog
>
