Date: Fri, 3 Mar 2006 08:17:12 GMT From: Pietro Cerutti <pietro.cerutti@gmail.com> To: freebsd-gnats-submit@FreeBSD.org Subject: bin/94045: dump(8) seg-fault on nullfs Message-ID: <200603030817.k238HCSN070807@www.freebsd.org> Resent-Message-ID: <200603030820.k238K75L019448@freefall.freebsd.org>
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>Number: 94045 >Category: bin >Synopsis: dump(8) seg-fault on nullfs >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Fri Mar 03 08:20:07 GMT 2006 >Closed-Date: >Last-Modified: >Originator: Pietro Cerutti >Release: 6.0-STABLE >Organization: - >Environment: FreeBSD gahr 6.0-STABLE FreeBSD 6.0-STABLE #4: Wed Mar 1 16:51:41 CET 2006 toor@gahr:/usr/obj/usr/src/sys/GAHR i386 >Description: The dump(8) utility crashes on nullfs types, when they are mounted via fstab. A nullfs is defined in the last row of /etc/fstab: # Device Mountpoint FStype Options Dump Pass# /dev/ad0s2b none swap sw 0 0 /dev/ad0s2a / ufs rw 1 1 /dev/ad0s2f /home ufs rw 2 2 /dev/ad0s2e /usr ufs rw 2 2 /dev/ad0s2d /var ufs rw 2 2 /dev/acd0 /cdrom cd9660 ro,noauto 0 0 /dev/cd0 /cdrom cd9660 ro,noauto 0 0 /dev/ad0s1 /mnt/win ntfs ro,noauto 0 0 /dev/da0 /mnt/pen msdosfs rw,noauto 0 0 linprocfs /compat/linux/proc linprocfs rw 0 0 proc /proc procfs rw 0 0 /usr/local/etc /mnt/tmp nullfs rw,noauto 0 0 After mounting it with (# mount /mnt/tmp), it appears in the list of mounted filesystems (# mount). See the last row: /dev/ad0s2a on / (ufs, local) devfs on /dev (devfs, local) /dev/ad0s2f on /home (ufs, local, soft-updates) /dev/ad0s2e on /usr (ufs, local, soft-updates) /dev/ad0s2d on /var (ufs, local, soft-updates) linprocfs on /usr/compat/linux/proc (linprocfs, local) procfs on /proc (procfs, local) pid747@gahr:/net on /net (nfs) pid747@gahr:/host on /host (nfs) srv-file:/share on /.amd_mnt/srv-file/host/share (nfs, nosuid) /usr/local/etc on /mnt/tmp (nullfs, local) dump(8) seg-faults trying to dump it: # dump -0 -f usr.local.etc /mnt/tmp DUMP: SIGSEGV: ABORTING! Segmentation fault (core dumped) The strange is that if the nullfs filesystem is not listed in /etc/fstab, and is mounted by hand (# mount_nullfs /usr/local/etc /mnt/tmp), then dump(8) gives an "unknown filesystem error), which is acceptable: # mount_nullfs /usr/local/etc/ /mnt/tmp # dump -0 -f usr.local.etc /mnt/tmp dump: /mnt/tmp: unknown file system >How-To-Repeat: 1) add a line in /etc/fstab specifying a nullfs mount point (e.g. /usr/ on /mnt) 2) mount it (e.g. mount /mnt) 3) try to dump it (e.g. dump -0 -f test /mnt) -> dump should seg-fault 4) remove the line in /etc/fstab 5) mount a nullfs by hand (e.g. mount_nullfs /usr/ mnt/) 6) try to dump it (e.g dump -0 -f test /mnt) -> dump should say "dump: /mnt: unknown file system" >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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