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Re: kern/45648: Powering off unmounted SATA disk panics

The following reply was made to PR kern/45648; it has been noted by GNATS.

From: Manuel Bouyer <>
Subject: Re: kern/45648: Powering off unmounted SATA disk panics
Date: Thu, 24 Nov 2011 18:11:49 +0100

 On Thu, Nov 24, 2011 at 12:30:01PM +0000, Hauke Fath wrote:
 > System: NetBSD venediger 5.1_STABLE NetBSD 5.1_STABLE (VENEDIGER) #0: Wed 
 > Feb 23 21:05:10 CET 2011 
 > hf@Hochstuhl:/var/obj/netbsd-builds/5/i386/sys/arch/i386/compile/VENEDIGER 
 > i386
 > Architecture: i386
 > Machine: i386
 > >Description:
 >      A sata disk, powered up and connected to the machine, but not
 >      mounted (might not have been mounted ever, but since the
 >      machine had been up 150+ d, it is hard to tell) was powered
 >      off. A few hours later, the machine panicked with
 > piixide0:1:1: recal drive fault
 > wd0d: device fault reading fsbn 0 (wd0 bn 0; cn 0 tn 0 sn 0), retrying
 > NMI ... going to debugger
 NMI, this is bad. It's usually caused by hardware problems.
 >  [...]
 > >Fix:
 >      Something in the kernel appears to have hung on to the disk,
 possibly one of the daily task, trying to read the partition table.
 After a few errors,  the controller would be reset, powering up the
 >      and something else appears to have considered the resulting
 >      error 'fatal'. Both should not have happened.
 The hardware considered it fatal, as it posted an NMI.
 Manuel Bouyer <>
      NetBSD: 26 ans d'experience feront toujours la difference

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