NetBSD Problem Report #41126
From zza@serpens.de Fri Apr 3 10:38:11 2009
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Date: Fri, 3 Apr 2009 12:37:51 +0200
From: Bernhard Moellemann <zza@serpens.de>
To: gnats-bugs@gnats.NetBSD.org
Subject: fsck_ffs does not check for Cylinder Magic and gets confused
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>Number: 41126
>Category: bin
>Synopsis: fsck_ffs does not check for Cylinder Magic and gets confused
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: bin-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Fri Apr 03 10:40:00 +0000 2009
>Originator: Bernhard Moellemann
>Release: NetBSD 5.0_RC1
>Organization:
Home entertainment construction site
>Environment:
System: NetBSD arcanic 5.0_RC1 NetBSD 5.0_RC1 (GENERIC) #0: Tue Feb 3 11:46:51 CET 2009 root@arcanic:/mnt/top/src/src-5dm/obj/sys/arch/i386/compile/GENERIC i386
Architecture: i386
Machine: i386
>Description:
fsch_ffs reads values from a cylinder group header and uses them without
verifing if they may be broken. If a cylinder group header is seriously
broken, it is unable to fsck the filesystem
>How-To-Repeat:
Have a broken filesystem after a crash like this
cg 2152:
magic 7d7d7d80 tell 2c9d77a0000 time Fri Aug 14 03:52:58 1908
cgx -2105507712 niblk -1903128946 ndblk 2038004089
nbfree 2071690105 ndir 2038004089 nifree 2071690107 nffree 2038004089
rotor 2071690105 irotor 2105375611 frotor 2071690107
frsum -2105245054 -2139061630 -2071690624
sum of frsum: 286461702 (dumpfs crashes at this line)
Note, that even cg_magic is bad!
fsck_ffs it and you get
too many inodes 18446744071806291598
>Fix:
not known. Perhaps a check in
src/sbin/fsck_ffs/pass1.c, line 107 like
if (!cg_chkmagic(cgp, 0))
printf("CG %d: BAD MAGIC NUMBER\n", c);
and a skip and CG->new() operation would help?
Bernhard //
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