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

[hch@xxxxxx]

Hi Dexuan,

I've spent some time with the logs and looking over the code and
couldn't find any smoking gun.  I start to wonder if it might just
be a timing issue?

Can you try one or two things for me:

 1) run with the blk-mq I/O path for scsi by either enabling it a boot /
    module load time with the scsi_mod.use_blk_mq=Y option, or at compile
    time by enabling the CONFIG_SCSI_MQ_DEFAULT option.  If that fails
    with the commit a blk-mq run before the commit would also be useful.
 2) if possible run a VM config without the virtual CD-ROM drive -
    a lot of the scsi log chatter is about handling timeouts on the
    CD drive, so that might be able to isolate issues a bit better.

Note that I'll be offline from this afternoon European time until Sunday
night as I'm out in the mountains at a lodge without internet access,
but this issue will be my priority once back.