Date: Fri, 1 Apr 2005 20:26:03 -0800 (PST) From: Doug White <dwhite@gumbysoft.com> To: Gary Mu1der <gmulder@infotechfl.com> Cc: freebsd-amd64@freebsd.org Subject: Re: Tyan k8sr lockups Message-ID: <20050401201907.U95587@carver.gumbysoft.com> In-Reply-To: <424DA4B3.3070703@infotechfl.com> References: <f0111a98c01333b3c306c81d10294de4@khera.org> <Pine.SOC.4.61.0503300229560.3181@tea.blinkenlights.nl> <424C215E.5080201@infotechfl.com><424C4EED.5070601@infotechfl.com> <424D58F7.1010005@infotechfl.com><424DA4B3.3070703@infotechfl.com>
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On Fri, 1 Apr 2005, Gary Mu1der wrote: > I have isolated the crash to the following dd command: > > dd if=/dev/mem of=/dev/null bs=1024k skip=4040 count=1 Reading from random places in /dev/mem will cause unpredicatable behavior. Memory at that offset is in PCI memory-mapped device space, and reading from there may disrupt the PCI bridge, enable or disable interrupts, or worse. -- Doug White | FreeBSD: The Power to Serve dwhite@gumbysoft.com | www.FreeBSD.org
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