linux-kernel - RE: Boot regression (was "Re: [PATCH] genhd: Do not hold event lock when scheduling workqueue elements")

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Date:   Tue, 14 Feb 2017 14:46:41 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     "hch@....de" <hch@....de>
CC:     Jens Axboe <axboe@...nel.dk>,
        Bart Van Assche <Bart.VanAssche@...disk.com>,
        "hare@...e.com" <hare@...e.com>, "hare@...e.de" <hare@...e.de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "jth@...nel.org" <jth@...nel.org>,
        Nick Meier <Nick.Meier@...rosoft.com>,
        "Alex Ng (LIS)" <alexng@...rosoft.com>,
        Long Li <longli@...rosoft.com>,
        "Adrian Suhov (Cloudbase Solutions SRL)" <v-adsuho@...rosoft.com>,
        "Chris Valean (Cloudbase Solutions SRL)" <v-chvale@...rosoft.com>
Subject: RE: Boot regression (was "Re: [PATCH] genhd: Do not hold event lock
 when scheduling workqueue elements")

> From: hch@....de [mailto:hch@....de]
> Sent: Tuesday, February 14, 2017 22:29
> To: Dexuan Cui <decui@...rosoft.com>
> Subject: Re: Boot regression (was "Re: [PATCH] genhd: Do not hold event lock
> when scheduling workqueue elements")
> 
> Ok, thanks for testing.  Can you try the patch below?  It fixes a
> clear problem which was partially papered over before the commit
> you bisected to, although it can't explain why blk-mq still works.

Still bad luck. :-(

BTW, I'm using the first "bad" commit (scsi: allocate scsi_cmnd structures as
part of struct request) + the 2 patches you provided today.

I suppose I don't need to test the 2 patches on the latest linux-next repo.

Thanks,
-- Dexuan