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Date:      Sat, 21 Oct 1995 13:10:00 +0100 (MET)
From:      Andreas Klemm <andreas@knobel.gun.de>
To:        hackers@freebsd.org
Subject:   FreeBSD stable dies when mounting /tmp as MFS twice (light weight prosa :-)
Message-ID:  <Pine.BSF.3.91.951021125825.209A-100000@knobel.gun.de>

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Hi !

Today I had magic fingers... :-)

Perhaps one could / should (?) add some sanity checks into
the "mount MFS" code that prevent attempts to mount a MFS
twice ?!

The situation:

I had /tmp configured to be MFS mounted.
Added /var/tmp to fstab, to be MFS mounted, too.
Then I entered the command

	mount -at mfs

and the system crashed within 5 seconds showing the following messages:


Oct 21 12:00:47 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:47 knobel /kernel: , retries:4
Oct 21 12:00:47 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:47 knobel /kernel: , retries:3
Oct 21 12:00:47 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:47 knobel /kernel: , retries:3
Oct 21 12:00:47 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:47 knobel /kernel: , retries:2
Oct 21 12:00:47 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:47 knobel /kernel: , retries:2
Oct 21 12:00:47 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:47 knobel /kernel: , retries:1
Oct 21 12:00:48 knobel /kernel: sd0(ahc0:tries:3
Oct 21 12:00:48 knobel /kernel: etries:1
Oct 21 12:00:48 knobel /kernel: sd0(ahc0:0:0): verlapped commands attempted sks:80,0
Oct 21 12:00:48 knobel /kernel: , retries:1
Oct 21 12:00:48 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 OverlaD asc:4e,0 Overlapped commands a
Oct 21 12:00:48 knobel /kernel: , FAILURE
Oct 21 12:00:48 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:48 knobel /kernel: , FAILURE
Oct 21 12:00:48 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:48 knobel /kernel: , retries:4
Oct 21 12:00:48 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:49 knobel /kernel: , retries:3
Oct 21 12:00:49 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted commands attempted sks:80,0
Oct 21 12:00:49 knobel /kernel: , re0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:49 knobel /kernel: , retries:1
Oct 21 12:00:49 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:49 knobel /kernel: , FAILURE
Oct 21 12:00:49 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped comme,0 Overlapped commands attemptes:4
Oct 21 12:00:49 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:49 knobel /kernel: , retries:4
Oct 21 12:00:49 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:49 knobel /kernel: , retries:3
Oct 21 12:00:49 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:49 knobel /kernel: , retries:3
Oct 21 12:00:49 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:8nds attempted sks:80,0
Oct 21 12:00:50 knobel /kernel: , FAILUREBORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:50 knobel /kernel: , retries:2
Oct 21 12:00:50 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:50 knobel /kernel: , retries:1
Oct 21 12:00:50 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:50 knobel /kernel: , retries:1
Oct 21 12:00:50 knobel /kernel: sd0(ahc0:0:0): ABORTED COMMAND asc:4e,0 Overlapped commands attempted sks:80,0
Oct 21 12:00:50 knobel /kernel: , FAILURE
Oct 21 12:00:50 knobel /kernel: sd0(ah
Oct 21 12:00:50 knobel /kernel: , retries:1
Oct 21 12:00:50 knobel /kernel: ries:3
Oct 21 12:00:51 knobel /kernel: sd0(


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