why panic(9) ?

C. P. Ghost cpghost at cordula.ws
Tue Jan 11 20:54:34 UTC 2011

On Tue, Jan 11, 2011 at 9:50 PM, Boris Kochergin <spawk at acm.poly.edu> wrote:
>> Exactly. One area where the kernel should be made more robust
>> is UFS with disappearing disks (e.g. USB mounted file systems,
>> or, as recently happened here with a loose external SATA cable).
>> Panicing here is REALLY annoying. ;-)
> Getting slightly off-topic here, but... there was progress made on this
> front a while ago. You can reliably detach at least USB storage with a
> mounted MSDOSFS or UFS filesystem without soft updates and not risk a system
> panic. There will be a panic if soft updates are enabled on UFS, however, at
> least as of my last test in 2010.

Hmmm... yes, you're absolutely right: every time I had those panics
was with softupdates enabled. No recent panic with UFS without
softupdates that I remember, nor with msdosfs btw.

> -Boris


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