linux-kernel - Re: [PATCH V2 2/2] blk-mq: fix blk_mq_tagset_busy

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Date:   Thu, 2 Aug 2018 11:37:20 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        Josef Bacik <josef@...icpanda.com>,
        Christoph Hellwig <hch@....de>,
        Mark Brown <broonie@...nel.org>,
        Matt Hart <matthew.hart@...aro.org>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        John Garry <john.garry@...wei.com>,
        Hannes Reinecke <hare@...e.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 2/2] blk-mq: fix blk_mq_tagset_busy_iter

On Fri, Aug 03, 2018 at 01:49:37AM +0800, Ming Lei wrote:
> Commit d250bf4e776ff09d5("blk-mq: only iterate over inflight requests
> in blk_mq_tagset_busy_iter") uses 'blk_mq_rq_state(rq) == MQ_RQ_IN_FLIGHT'
> to replace 'blk_mq_request_started(req)', this way is wrong, and causes
> lots of test system hang during booting.
> 
> Fix the issue by using blk_mq_request_started(req) inside bt_tags_iter().
> 
> Fixes: d250bf4e776ff09d5 ("blk-mq: only iterate over inflight requests in blk_mq_tagset_busy_iter")
> Cc: Josef Bacik <josef@...icpanda.com>
> Cc: Christoph Hellwig <hch@....de>
> Cc: Guenter Roeck <linux@...ck-us.net>
> Cc: Mark Brown <broonie@...nel.org>
> Cc: Matt Hart <matthew.hart@...aro.org>
> Cc: Johannes Thumshirn <jthumshirn@...e.de>
> Cc: John Garry <john.garry@...wei.com>
> Cc: Hannes Reinecke <hare@...e.com>,
> Cc: "Martin K. Petersen" <martin.petersen@...cle.com>,
> Cc: James Bottomley <James.Bottomley@...senpartnership.com>
> Cc: linux-scsi@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Reported-by: Mark Brown <broonie@...nel.org>
> Reported-by: Guenter Roeck <linux@...ck-us.net>
> Signed-off-by: Ming Lei <ming.lei@...hat.com>

Tested-by: Guenter Roeck <linux@...ck-us.net>

Test builds (with both patches applied):

Building mips:malta_defconfig:nosmp ... running ..... passed
Building mips:malta_defconfig:smp ... running ..... passed
Building x86_64:q35:Broadwell-noTSX:defconfig:smp:sata:rootfs ... running .....  passed
Building x86_64:q35:IvyBridge:defconfig:smp:nvme:rootfs ... running ..... passed
Building x86_64:q35:SandyBridge:defconfig:smp:usb:rootfs ... running ......  passed
Building x86_64:q35:Haswell:defconfig:smp:usb-uas:rootfs ... running ......  passed
Building x86_64:q35:Skylake-Client:defconfig:smp:mmc:rootfs ... running ......  passed
Building x86_64:q35:Conroe:defconfig:smp:scsi[DC395]:rootfs ... running .......  passed
Building x86_64:q35:Nehalem:defconfig:smp:scsi[AM53C974]:rootfs ... running ....... passed
Building x86_64:q35:Westmere-IBRS:defconfig:smp:scsi[53C810]:rootfs ... running ...... passed
Building x86_64:q35:Skylake-Server:defconfig:smp:scsi[53C895A]:rootfs ...  running ...... passed
Building x86_64:pc:EPYC:defconfig:smp:scsi[MEGASAS]:rootfs ... running ......  passed
Building x86_64:q35:EPYC-IBPB:defconfig:smp:scsi[MEGASAS2]:rootfs ... running ..... passed
Building x86_64:q35:Opteron_G5:defconfig:smp:scsi[FUSION]:rootfs ... running ..... passed
Building x86_64:pc:phenom:defconfig:smp:initrd ... running ..... passed
Building x86_64:q35:Opteron_G1:defconfig:smp:initrd ... running ..... passed
Building x86_64:pc:Opteron_G2:defconfig:smp:sata:rootfs ... running ..... passed
Building x86_64:q35:core2duo:defconfig:smp:usb:rootfs ... running ...... passed
Building x86_64:pc:Opteron_G3:defconfig:nosmp:usb:rootfs ... running .......  passed
Building x86_64:q35:Opteron_G4:defconfig:nosmp:sata:rootfs ... running ......  passed

Guenter