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

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Message-ID: <1452279417.2297.5.camel@HansenPartnership.com>
Date:	Fri, 08 Jan 2016 10:56:57 -0800
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	"Luck, Tony" <tony.luck@...el.com>,
	"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?

On Fri, 2016-01-08 at 18:42 +0000, Luck, Tony wrote:
> > We're not quite out of the woods yet: dracut should have seen this
> > automatically because of the module alias bindings.  Is your system
> > somehow unusual and you don't expect the initrd automatic module
> > selection to work?  If not, could you help us debug why it didn't?
> 
> I saw the same problem building a 4.4-rc* kernel on a RHEL7.2
> and SLES12-SP1 system.
> 
> My build process is in both cases is:
> $ tar xf linux-...
> $ cd linux...
> $ cp /boot/config-xyzzy .
> $ yes "" | make oldconfig
> $ make -j 100
> $ su
> # make -j 100 modules_install && make install
> 
> What sort of features of a system might be considered "unusual"?
> This looks a very simple system ... just one disk controller with two
> drive bays occupied.
> 
> Let me know if you'd like run any topology reporting commands.

No, the problem will lie in the initrd building part.  I know that with
debian mkinitramfs takes the -v option which will tell you what modules
it's selecting and why, but I'm not very familiar with enterprise
distributions; chances are whatever command you use to build the initrd
does take a -v.

James