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 14:47:36 +0100
From:   "hch@....de" <hch@....de>
To:     Dexuan Cui <decui@...rosoft.com>
Cc:     "hch@....de" <hch@....de>, 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")

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 */