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From:   "Justin Piszcz" <jpiszcz@lucidpixels.com>
To:     "'Bart Van Assche'" <bvanassche@acm.org>,
        "'Douglas Miller'" <dougmill@linux.vnet.ibm.com>
Cc:     "'LKML'" <linux-kernel@vger.kernel.org>,
        <linux-scsi@vger.kernel.org>
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Subject: RE: kernel 5.15 does not boot with 3ware card (never had this issue <= 5.14) - scsi 0:0:0:0: WARNING: (0x06:0x002C) : Command (0x12) timed out, resetting card
Date:   Sat, 6 Nov 2021 07:54:19 -0400
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-----Original Message-----
From: Bart Van Assche <bvanassche@acm.org>=20
Sent: Wednesday, November 3, 2021 12:23 PM
To: Justin Piszcz <jpiszcz@lucidpixels.com>; Douglas Miller =
<dougmill@linux.vnet.ibm.com>
Cc: LKML <linux-kernel@vger.kernel.org>; linux-scsi@vger.kernel.org
Subject: Re: kernel 5.15 does not boot with 3ware card (never had this =
issue <=3D 5.14) - scsi 0:0:0:0: WARNING: (0x06:0x002C) : Command (0x12) =
timed out, resetting card

On 11/3/21 9:18 AM, Justin Piszcz wrote:
> Thanks!-- Has anyone else reading run into this issue and/or are there
> any suggestions how I can troubleshoot this further (as all -rc's have
> the same issue)?

How about bisecting this issue
(https://www.kernel.org/doc/html/latest/admin-guide/bug-bisect.html)?

[ .. ]

I was having some issues finding a list of changes with git bisect, so I =
started checking the kernel .config and boot parameters:

I found the option that was causing the system not to boot (tested with =
5.15.0 and latest linux-git as of 6 NOV 2021)
append=3D"3w-sas.use_msi=3D1"

3w-sas.use_msi defaults to 0 (so now it is using IR-IO-APIC instead of =
MSI but now the machine boots using 5.15)
https://lwn.net/Articles/358679/

Something between 5.14 and 5.15 changed regarding x86_64's handling of =
Message Signaled Interrupts.
... which causes the kernel to no longer boot when 3w-sas.use_msi=3D1 is =
specified starting with 5.15.

Regards,

Justin.