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Re: ext3 device reported to be 100% full, but we do not know where? - solved



Hi Bill,

> On Tue, Jul 23, 2002 at 10:13:37PM +0200, Michael Hoennig wrote:
> > That IS the reason, and I found the cause: There was a nohup job
> > writing to nohup.out, which was deleted every 30 minutes by a cronjob
> > instead of truncated. These dead nohup.outs were not reported by lsof,
> > and of cause not linked in the file system anymore, but yet using up
> > space.  Isn't the last point a bug?
>  
> Of course not; you have a file descriptor to which you can (in the
> general case) read/write/seek arbitrarily.  It needs to be stored
> *somewhere* and that is in the filesystem.  This behaviour has been used
> for implementing temporary files that are automatically cleaned up (see
> tmpfile(3)) upon file close / program exit for a *long* time.

ok, then at least lsof should report such files.  Actually I forgot
something: Even after all processes holding this file handle, the storage
was never freed, only after umount/mount!  I have not checked it yet, but
if this storage is not even counted in quota, which I guess is the case,
it is a possible local DoS.  Any user, even with a reasonable quota, could
flood the device.

	Michael

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