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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" <>
Subject: Re: kern/49102 (wm detach panic on shutdown or reboot)
Date: Wed, 20 Aug 2014 23:46:15 -0500 (CDT)

 Enumerating only wm[01] works around the panic.
 The real problem appears to be the attachment of multiple "pchbN" devices.
 They appear to map the same PCI bus multiple times--especially "pchb2".
 The wm[23] devices share the same device/function as wm[01], but on the
 spurious "pci3" bus.  There is also a spurious attachment of "aac1" and
 "ppb1" also on "pci3" at the same device/function as their "aac0" and
 "ppb0" counterparts.  The "aac1" attach message is "can't find mem space".
 Looking at the 'dmesg' output more closely, a more comprehensive workaround
 would be to enumerate "pchb0" only.
 Probably a BIOS bug (or maybe a hardware bug/quirk).
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