Message-Id: <201204111417.28893.thomas@fjellstrom.ca>
Date:	Wed, 11 Apr 2012 14:17:28 -0600
From:	Thomas Fjellstrom <thomas@...llstrom.ca>
To:	adam radford <aradford@...il.com>
Cc:	lkml <linux-kernel@...r.kernel.org>, linux-scsi@...r.kernel.org
Subject: Re: stuck in megaraid_sas.c megasas_adp_reset_gen2

On Wed Mar 21, 2012, you wrote:
> On Wed Mar 21, 2012, adam radford wrote:
> > On Wed, Mar 21, 2012 at 4:16 PM, Thomas Fjellstrom <thomas@...llstrom.ca>
> 
> wrote:
> > > I recently got an IBM M1015 (MegaRaid 9240-8i) card, and after getting
> > > a new motherboard, the system now boots, but the megaraid_sas driver
> > > seems to be getting stuck when trying to initialize the card.
> > > 
> > > Looking through the source, it seems to be stuck in the
> > > megasas_adp_reset_gen2 function, in the while loop at the end. Now,
> > > according to the code it can't actually get stuck there permanently,
> > > but it does take quite a while for the loop to finish, and the udev
> > > timeout messages to stop.
> > > 
> > > I've looked around quite a bit, but haven't found any solutions thus
> > > far. If anyone could point me in the right direction I'd appreciate
> > > it.
> > 
> > If you are getting controller resets during driver load, you must not
> > be getting interrupts or firmware is not responding to the inquiry
> > roll-call.  Make sure you have the latest firmware.
> 
> I updated to the latest on LSI's site today before emailing. It changes the
> behavior slightly. With the older firmware, it would not print any of the
> initial reset messages, but would once udev decides to start killing
> modprobe. With the new firmware, I get a:
> 
> ADP_RESET_GEN2: HostDiag=a0
> 
> followed by a bunch of:
> 
> RESET_GEN2: retry=%x, hostdiag=a4
> 
> Now I'm not sure the hostdiag should be different between the two. if this
> aN identifier is similar to the aN identifiers in the MegaCli tool, then
> it would mean its trying to reset a device that doesn't exist? I only have
> a single M1015 card installed.
> 
> > The code at the end of megasas_adp_reset_gen2() just looks for
> > DIAG_RESET_ADAPTER flag to clear on the host diag register when
> > issuing a controller reset... that should happen almost immediately
> > unless there is a hardware or firmware issue.
> > 
> > Are you sure your 'new' motherboard is actually good ?
> 
> It boots and runs fine without the sas card installed. I haven't run any
> heavy load tests, but it seems ok.

Machine has been solid as a rock (sans 9240-8i) for the past month with mild 
to half load. It runs several virtual machines, a nfs share, my firewall, a 
minecraft server, and some other miscellaneous stuff. Not a single hiccup.

> > Can you move your megaraid 9240-8i into a 'known working' system and
> > re-test ?
> 
> Nope. This is the furthest I've gotten it to get with this card installed.
> The old system would fail to boot into grub properly, let alone linux.
> These cards seem to be /very/ picky about what motherboard you install
> them in.
> 
> > -Adam

I just got a second M1015 card in today and gave it a go. Similar issues, 
different log messages. (hand typed from picture taken of screens)

Lots of:

megasas: Waiting for 1 commands to complete

for quite a while (5-10 minutes), along with udevd trying to kill modprobe. 
Then:

megasas: moving cmd[0]:hexstringherewithcolons queue as internal
megaraid_sas: FW detected to be in fault state, restarting it...
ADP_RESET_GEN2: HostDiag=a0
megaraid_sas: FW restarted successfully,initializing next stage...
megaraid_sas: HBA recovery state machine,state 1 starting...
(sits here for a while)
megasas: Waiting for FW to come to ready state
megasas: FW now in ready state
megaraid_sas: command hexstringhere, hexstringhere detected (something?) while 
HBA reset
megasas: command hexstring scsi cmd [12]detected on the internal (something?) 
again
megasas: reset successful
scsi:0:0:0:0: megasas: RESET cmd=12 retries=0
megaraid_sas: no pending cmds after reset
megasas: reset successful
scsi:0:0:0:0: megasas: RESET cmd=12 retries=0
megaraid_sas: no pending cmds after reset
megasas: reset successful
scsi:0:0:0:0: Device offlined - not ready after error recovery
(other scsi devices are detected)
(bootup hangs here)

Eventually theres some "hung task" timeout backtraces. This is where I tried 
to kill udevd, CTRL+C didn't stop it from trying to kill modprobe, and 
ALT+SYSRQ+K caused a silent oops (keyboard leds blinking, no backtrace or OOPS 
text). If its similar to last time, eventually the kernel will outright OOPS 
without any intervention.

-- 
Thomas Fjellstrom
thomas@...llstrom.ca
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