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Date: Mon, 21 Jul 2014 10:16:54 +0200 From: Jens Axboe <axboe@...nel.dk> To: Alexander Gordeev <agordeev@...hat.com>, linux-kernel@...r.kernel.org Subject: Re: [PATCH] blk-mq: bitmap tag: fix potential unwakeable sleep in bt_get() On 2014-07-21 10:10, Alexander Gordeev wrote: > There is a race between __bt_get_word() and bt_clear_tag(). Since > access to the tags bitmap is not serialized __bt_get_word() might > miss a tag which is about to or being returned by bt_clear_tag(). > As result, the process requesting the tag might end up schedulled > out forever. > > To avoid this corner case call io_schedule_timeout() instead of > io_schedule(). The timeout should be long enough to not falsely > wake up waiters often, so take the requests queue's "rq_timeout" > for that. What is this patch against? -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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