linux-kernel - Re: [PATCH] block: fix request.queuelist usage in flush

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Date: Tue, 04 Jun 2024 08:17:18 -0600
From: Jens Axboe <axboe@...nel.dk>
To: ming.lei@...hat.com, hch@....de, f.weber@...xmox.com, 
 bvanassche@....org, Chengming Zhou <chengming.zhou@...ux.dev>
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
 zhouchengming@...edance.com
Subject: Re: [PATCH] block: fix request.queuelist usage in flush


On Tue, 04 Jun 2024 14:47:45 +0800, Chengming Zhou wrote:
> Friedrich Weber reported a kernel crash problem and bisected to commit
> 81ada09cc25e ("blk-flush: reuse rq queuelist in flush state machine").
> 
> The root cause is that we use "list_move_tail(&rq->queuelist, pending)"
> in the PREFLUSH/POSTFLUSH sequences. But rq->queuelist.next == xxx since
> it's popped out from plug->cached_rq in __blk_mq_alloc_requests_batch().
> We don't initialize its queuelist just for this first request, although
> the queuelist of all later popped requests will be initialized.
> 
> [...]

Applied, thanks!

[1/1] block: fix request.queuelist usage in flush
      commit: a315b96155e4c0362742aa3c3b3aebe2ec3844bd

Best regards,
-- 
Jens Axboe