mps(4) blocks panic-reboot

[Scott Long]

Good summary Steve, I forgot about this.  I'm traveling today, but if I have time tonight I'll see if I still have any notes or patches.

Scott

Sent from my iPhone

> On Jun 1, 2017, at 10:25 AM, Stephen Mcconnell <stephen.mcconnell at broadcom.com> wrote:
> 
> I found a couple of emails between me and Scott a while back and we talked
> about this. The problem is that the SSU handling relies on interrupts, but
> interrupts stop due to the panic, so it hangs. Scott came up with a way
> around it but we never decided on a final fix and then it was forgotten
> about. If you have a way to reproduce this, I can try to find a fix here.
> Or, I might be able to force the system to panic at the right time.
> 
> Steve
> 
>> -----Original Message-----
>> From: Stephen Mcconnell [mailto:stephen.mcconnell at broadcom.com]
>> Sent: Thursday, June 01, 2017 8:51 AM
>> To: 'Harry Schmalzbauer'; 'freebsd-scsi at freebsd.org'; 'Scott Long'
>> Subject: RE: mps(4) blocks panic-reboot
>> 
>> Scott, did you have a fix for this some time back?
>> 
>> Steve
>> 
>>> -----Original Message-----
>>> From: owner-freebsd-scsi at freebsd.org [mailto:owner-freebsd-
>>> scsi at freebsd.org] On Behalf Of Harry Schmalzbauer
>>> Sent: Thursday, June 01, 2017 3:30 AM
>>> To: freebsd-scsi at freebsd.org
>>> Subject: mps(4) blocks panic-reboot
>>> 
>>> Hello,
>>> 
>>> I'm not sure if scsi@ is the correct list, but since my problem seems
>>> to be mps(4) related, I thought asking here shouldn't be too wrong.
>>> 
>>> There's not much to add to the topic: If my stable/11 setup panics,
>>> the system doesn't reboot (besides IPMI-watchdog takes over this
> task).
>>> The machine stucks with these last lines:
>>> Dumping 1669 out of 15734
>>> MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%
>>> Dump complete
>>> mps0: Sending StopUnit: path (xpt0:mps0:0:2:ffffffff):  handle 12
>>> mps0: Incrementing SSU count
>>> mps0: Sending StopUnit: path (xpt0:mps0:0:3:ffffffff):  handle 11
>>> mps0: Incrementing SSU count
>>> mps0: Sending StopUnit: path (xpt0:mps0:0:4:ffffffff):  handle 10
>>> mps0: Incrementing SSU count
>>> mps0: Sending StopUnit: path (xpt0:mps0:0:5:ffffffff):  handle 9
>>> mps0: Incrementing SSU count
>>> mps0: Sending StopUnit: path (xpt0:mps0:0:6:ffffffff):  handle 13
>>> mps0: Incrementing SSU count
>>> 
>>> Then, nothing happens. On a similar setup without mps(4), the machine
>>> reboots after the panic.
>>> 
>>> Is this a known problem/feature?
>>> 
>>> Thanks,
>>> 
>>> -harry
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