Date: Wed, 14 Oct 2009 15:30:43 +0200 (CEST) From: Alexander Best <alexbestms@math.uni-muenster.de> To: <gary.jennejohn@freenet.de> Cc: freebsd-current@FreeBSD.org Subject: Re: buffers not syncing correctly during shutdown Message-ID: <permail-20091014133043f0889e8400002bd8-a_best01@message-id.uni-muenster.de> In-Reply-To: <20091014151026.699a5765@ernst.jennejohn.org>
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Gary Jennejohn schrieb am 2009-10-14: > On Wed, 14 Oct 2009 12:49:54 +0200 (CEST) > Alexander Best <alexbestms@math.uni-muenster.de> wrote: > > hi there, > > to keep it short: > > 1. mount a removable device (e.g. an usb stick) (better use -r to > > prevent data > > loss) > > 2. unplug the device (without unmounting it) > > 3. `shutdown -r now` > > what happens is that the usual shutdown routine gets processed > > until all > > buffers are synced, but then the system stalls. > > after resetting the system all devices (which were supposed to be > > synced) are > > marked dirty and are being fsck'ed. > > cheers. > > alex > > oh...and i'm running FreeBSD otaku 9.0-CURRENT FreeBSD 9.0-CURRENT > > #0 r197914: > > Sat Oct 10 02:58:19 CEST 2009 > > root@otaku:/usr/obj/usr/src/sys/ARUNDEL > > i386 > I'm inclined to say that umount'ing the file systems is failing > because > you pulled the USB stick out without doing umount. Of course, that > results in all file systems still being marked dirty. Obviously, > this > pathological case isn't being handled. > I personally don't see why it ever should be handled. This is UNIX > not > Windows and users should be smart enough to know that they umount > such > devices before removing them otherwise nasty things can happen. > --- > Gary Jennejohn this is 2009 and not the 70s/80s. the amount or non-removable devices is declining day by day. eventually all storage devices will become removable and freebsd should keep up with this development. i don't think labelling this obvious bug as a grand unix feature is valid. also there are other scenarios where this problem can occur. if the device produces i/o errors you won't be able to unmount it even with the -f switch. alex
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