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From: "Sam Leffler" <sam@errno.com>
To: "Archie Cobbs" <archie@dellroad.org>,
	"David Rhodus" <david@uky.edu>
Cc: "Archie Cobbs" <archie@dellroad.org>,
	"Kirk McKusick" <mckusick@beastie.mckusick.com>,
	<freebsd-current@FreeBSD.ORG>
References: <200212061901.gB6J1pUI065085@arch20m.dellroad.org>
Subject: Re: backgroud fsck is still locking up system (fwd)
Date: Fri, 6 Dec 2002 11:56:38 -0800
Organization: Errno Consulting
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> Finally, one more bit of info: I have WITNESS enabled in this kernel> and
get this message during boot:
>
>     /usr/src/sys/vm/uma_core.c:1330: could sleep with "dc0" locked from
/usr/src/sys/pci/if_dc.c:691
>

if_attach does a malloc with M_WAITOK.  If the attach happens inside a lock
in the driver's attach method (typical) then you'll get this complaint.
Fixing it, and some other similar stuff, requires some care since the code
assumes malloc will not fail.

I decided to leave it until after 5.0.

    Sam


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