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 14:17:52 +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]
> 
> Hi Dexuan,
> 
> can you try the hack below for now?  I disable the TUR call from
> sd_check_events, which I think your VM is hanging on.  The checks
> it does on the sense data look a bit fishy, but so far I've not
> identified a possible root cause.
> 
> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index 40b4038c019e..1502e87c2be9 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -1457,9 +1457,13 @@ static unsigned int sd_check_events(struct
> gendisk *disk, unsigned int clearing)
>  	retval = -ENODEV;
> 
>  	if (scsi_block_when_processing_errors(sdp)) {
> +#if 0
>  		sshdr  = kzalloc(sizeof(*sshdr), GFP_KERNEL);
>  		retval = scsi_test_unit_ready(sdp, SD_TIMEOUT,
> SD_MAX_RETRIES,
>  					      sshdr);
> +#else
> +		retval = 0;
> +#endif
>  	}
> 
>  	/* failed to execute TUR, assume media not present */

Unluckily, the issue is still there.
Please see the attachment for the new log.
It looks somewhere we're still sending the cmd "Test Unit Ready", which
somehow hangs.

Thanks,
-- Dexuan

Download attachment "putty.log" of type "application/octet-stream" (30844 bytes)