linux-kernel - RE: System "hangs" on kernels > v4.4-rc1

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Date:	Fri, 8 Jan 2016 17:32:50 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: RE: System "hangs" on kernels > v4.4-rc1 - mpt2sas problem?

> If you previously had MPT2SAS enabled in your .config then the new
> kernel should automatically pull MPT3SAS in. You still need to verify in
> your initrd that the mpt3sas.ko module gets included, though. How that
> works depends on your distro.

Aha! That looks to be the problem. Looking at the initrd generated by
a simple:

 # make install

for the kernel ... I see no "mpt" drivers of any kind!.

The failure mode is very, very odd though. Shouldn't I have got a
"can't mount root" error?

/me goes to find how to tell Dracut to add the mpt3sas module to
the initrd.

Thanks

-Tony