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Date:      Thu, 8 May 2003 13:53:49 -0400
From:      "Will Saxon" <WillS@housing.ufl.edu>
To:        <current@freebsd.org>
Subject:   hard lockups
Message-ID:  <0E972CEE334BFE4291CD07E056C76ED8CBBC51@bragi.housing.ufl.edu>

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Has anyone been experiencing non-panic hard freezes lately? I just =
started running -current a couple of weeks ago, before that I had =
5.0-RELEASE without seeing any problems.

Occasionally, I will just have a machine lockup, no panics, nothing. The =
machine is unresponsive to the network also.

Usually, there is some sort of disk activity - I have seen the lockup 3 =
or 4 times trying to compile/install things, and 2x today, once =
compiling a new kernel, the other while redirecting output from a job to =
a text file.

Today's lockups were using a May 6 kernel, SMP, none of the debugging =
options, SCHED_ULE, LAZY_SWITCH, ADAPTIVE_MUTEXES, and =
ZERO_COPY_SOCKETS. I have since recompiled to include all the debugging =
options, but the only thing that has shown up is a lock order reversal =
in the sound code.

This machine is a dual celeron and uses ata drives. DMA is turned on. =
Ethernet is via a 3c905B controller. The one hard drive is using the =
onboard HPT366 controller, not the PIIX one.

I'm not sure what else to include. I am always suspicious of hard =
lockups, it is difficult to pinpoint what causes them since there is no =
log entry to read. It could easily be a hardware issue, but since I =
hadn't had problems before -current I thought I would write in.

-Will



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