Date: Sat, 3 Apr 2010 01:22:46 GMT From: Yar Tikhiy <yar@FreeBSD.org> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/145309: Editing disk label invalidates the whole device Message-ID: <201004030122.o331Mkcf059536@www.freebsd.org> Resent-Message-ID: <201004030130.o331U6Xp037744@freefall.freebsd.org>
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>Number: 145309 >Category: kern >Synopsis: Editing disk label invalidates the whole device >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: Sat Apr 03 01:30:06 UTC 2010 >Closed-Date: >Last-Modified: >Originator: Yar Tikhiy >Release: 8.0-RELEASE >Organization: NA >Environment: 8.0-RELEASE GENERIC >Description: In single-user mode (with just / mounted r/o), any change to the label of the disk the root partition is residing on seems to immediately invalidate the device for the kernel. E.g., after the partition was written out by bsdlabel(8), any access to the disk with fail with EIO or EXIO. OTOH, in multi-user mode (i.e., with everything mounted r/w) editing the label is just impossible: bsdlabel will complain: bsdlabel: Class not found >How-To-Repeat: Boot in single-user mode. Create MFS /tmp so that the editor is happy: mdmfs -s10m md /tmp Change the default editor: export EDITOR=ed Start bsdlabel: bsdlabel -e ad0s1 Make a harmless change, e.g., create a new partition in the unused space at the end of the disk -- make sure there is some! Save. Run any command from / as nothing else is mounted, e.g., "ls /boot" or "reboot" See the kernel croak: vnode_pager_getpages: I/O read error ls: Input/output error or reboot: Device not configured >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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