2017-11-21 17:28:20

by Jens Axboe

[permalink] [raw]
Subject: Re: 4.14: WARNING: CPU: 4 PID: 2895 at block/blk-mq.c:1144 with virtio-blk (also 4.12 stable)

On 11/21/2017 03:14 AM, Christian Borntraeger wrote:
> Bisect points to
>
> 1b5a7455d345b223d3a4658a9e5fce985b7998c1 is the first bad commit
> commit 1b5a7455d345b223d3a4658a9e5fce985b7998c1
> Author: Christoph Hellwig <[email protected]>
> Date: Mon Jun 26 12:20:57 2017 +0200
>
> blk-mq: Create hctx for each present CPU
>
> commit 4b855ad37194f7bdbb200ce7a1c7051fecb56a08 upstream.
>
> Currently we only create hctx for online CPUs, which can lead to a lot
> of churn due to frequent soft offline / online operations. Instead
> allocate one for each present CPU to avoid this and dramatically simplify
> the code.
>
> Signed-off-by: Christoph Hellwig <[email protected]>
> Reviewed-by: Jens Axboe <[email protected]>
> Cc: Keith Busch <[email protected]>
> Cc: [email protected]
> Cc: [email protected]
> Link: http://lkml.kernel.org/r/[email protected]
> Signed-off-by: Thomas Gleixner <[email protected]>
> Cc: Oleksandr Natalenko <[email protected]>
> Cc: Mike Galbraith <[email protected]>
> Signed-off-by: Greg Kroah-Hartman <[email protected]>

I wonder if we're simply not getting the masks updated correctly. I'll
take a look.

--
Jens Axboe


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