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Re: kern/49102 (wm detach panic on shutdown or reboot)
The following reply was made to PR kern/49102; it has been noted by GNATS.
From: "John D. Baker" <jdbaker%mylinuxisp.com@localhost>
Subject: Re: kern/49102 (wm detach panic on shutdown or reboot)
Date: Thu, 21 Aug 2014 07:34:43 -0500 (CDT)
On Wed, 20 Aug 2014, John D. Baker wrote:
> Looking at the 'dmesg' output more closely, a more comprehensive
> workaround would be to enumerate "pchb0" only.
Eliding the wildcard "pchb*" match and nailing down only "pchb0"
eliminates the phantom PCI busses and their asscociated phantom devices.
The attachment of these additional "pchb" functions that overlay the
previously-attached PCI busses appears to be the source of the problem.
While I know there are some machines that legitimately use multiple
PCI-Host Bridges, the problem machine is not one of them:
000:00:0: ServerWorks CNB20-HE PCI Bridge (host bridge, revision 0x23)
000:00:1: ServerWorks CNB20-HE PCI Bridge (host bridge, revision 0x01)
000:00:2: ServerWorks CNB30-LE PCI Bridge (host bridge, revision 0x01)
000:00:3: ServerWorks CNB30-LE PCI Bridge (host bridge, revision 0x01)
The only legitimate pchb is bus 0, device 0, function 0. The rest
overlay the first and create phantom busses/devices.
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