>Number:         15790
>Category:       bin
>Synopsis:       dump SEGV's if source FS missing from /etc/fstab
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 03 01:22:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Dave Berger
>Release:        1.5.3_ALPHA / atari
>Organization:
>Environment:
NetBSD piano 1.5.3_ALPHA NetBSD 1.5.3_ALPHA (HADES_DLB) #0: Thu Feb 21 23:25:04 EST 2002    rootz@piano:/amd/piano/m/wrk/src/sys/arch/atari/compile/HADES_DLB atari
>Description:
  The "dump" command aborts with a SIGSEGV if the filesystem from which the data is being dumped is not listed in /etc/fstab (or if the filesystem is manually mounted on an alternate point which doesn't match its fstab listing).

background:

  I was doing hierarchy transfers via "dump -0f - <dir> | (cd <dest> ; restore -xf -)" and they were working--until I hit the failure mode.

  I tried some test cases and started to think the problem was with 'amd' mountpoints because there was no trouble with any others.

  Then, I tried shutting down amd, unmounting its FS's, and manually mounting one of them on /mnt instead of under /amd; a dump from this setup resulted in the same error.

  Finally, I made a /mnt entry in fstab for the same FS and remounted it.  This time the dump worked.

Note:

  Under NetBSD 1.5.2 / i386, the symptom is a

    DUMP: short read error from /mnt: [sector 8194]: count=1, got=0

instead of the

    DUMP: SIGSEGV: ABORTING!

of the 1.5.3_ALPHA atari machine.

>How-To-Repeat:
  Shortcut: rename /etc/fstab; run a dump.

  Full: unmount an FS and remount it manually on an alternate mountpoint (one not listed in /etc/fstab).
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: