Giant deadlock related to twe

[Vinod Kashyap]

> -----Original Message-----
> From: owner-freebsd-current at freebsd.org
> [mailto:owner-freebsd-current at freebsd.org]On Behalf Of Doug White
> Sent: Sunday, August 22, 2004 3:33 PM
> To: current at 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 = 0x80)
> twed0: controller error - device failure (flags = 0x80)
> twed0: controller error - device failure (flags = 0x80)
> twed0: controller error - device failure (flags = 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.