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From: "Vinod Kashyap" <vkashyap@amcc.com>
To: Doug White <dwhite@gumbysoft.com>, current@freebsd.org
Date: Mon, 23 Aug 2004 17:42:28 -0700
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Subject: RE: Giant deadlock related to twe
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> -----Original Message-----
> From: owner-freebsd-current@freebsd.org
> [mailto:owner-freebsd-current@freebsd.org]On Behalf Of Doug White
> Sent: Sunday, August 22, 2004 3:33 PM
> To: current@freebsd.org
> Subject: Giant deadlock related to twe
> =

> =

> Hey folks,
> =

> Just got this on my amd64 box. A disk flaked out in my =

> machine, which has
> a 3ware 8006-2LP with 2 80GB drives in a RAID0.  My X session =

> locked up
> and was able to break to ddb.  Some ddb twiddling follows.  =

> It looks like,
> at first glance, some sort of deadlock against softupdates.
> =

> twed0: drive timeouttwed0: drive timeouttwed0: drive =

> timeouttwed0: drive
> timeout
> twed0: drive timeouttwed0: drive timeouttwed0: drive timeouttwe0: AEN:
> <twe0: drive timeout for unknown unit 1>
> twed0: controller error - device failure (flags =3D 0x80)
> twed0: controller error - device failure (flags =3D 0x80)
> twed0: controller error - device failure (flags =3D 0x80)
> twed0: controller error - device failure (flags =3D 0x80)

The messages indicate timeouts due to the drive continuously returning
BUSY to the firmware on the controller.  This could be caused by the
the drive going bad, or even a one time disturbance like tugging of
cables, etc.