Re: Infamous 'root busy' on shutdown <=> unkillable processes on wait IO
Davide Libenzi (davide@maticad.it)
Sat, 30 Oct 1999 21:02:57 +0200
On Sat, 30 Oct 1999, Andreas Bombe wrote:
> On Thu, Oct 28, 1999 at 10:36:22PM +0200, François Désarménien wrote:
> > Since 2.2, there often happen to have processes in an 'unkillabe' state, waiting
> > for I/O usually on Unix sockets. This I/O never comes, so the root FS will be busy
> > forever.
> >
> > Why don't those processes have a slice when they get the KILL signal, so they could
> > cancel the IO and gracefully exit ? I though that when you do a read and a signal
> > (caught or not) is receive, the I/O was cancelled and the read returns EINTR.
>
> Only when the kernel code in question does interruptible sleeps. This
> seems not to be true in your case and the code deadlocked somewhere.
> You apparantly encountered a kernel bug.
>
> Try again with a more informative bug report (which processes are
> unkillable, in which function do they sleep ('ps axl', WCHAN field)).
> The usual stuff.
>
> > This is really annoying, the only turn around I found is to sync the filesystems
> > just before the final shutdown step, but if it preserves data integrity, it still
> > takes the (looooooooong) e2fsck time at reboot.
>
> You can avoid the fsck when you remount the filesystem read-only. You
> can do this either with 'mount yourfs -o remount,ro' or 'umount -a -r'.
>
> --
> Andreas E. Bombe <andreas.bombe@munich.netsurf.de>
> http://home.pages.de/~andreas.bombe/
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I've got the same behaviour on my Debian system, but changing glibc fixed the
problem ( I use a dicember 98 fix of glibc-2.0.7 ).
Cheers,
Davide.
--
"Debian, the freedom in freedom."
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