Date: Wed, 14 Dec 2016 09:14:30 -0700 From: Alan Somers <asomers@freebsd.org> To: Dirk-Willem van Gulik <dirkx@webweaving.org> Cc: FreeBSD Hackers <hackers@freebsd.org> Subject: Re: ZFS - directory entry Message-ID: <CAOtMX2i5_tL=jXcq2T5F2CkiQUVK9DoYofUsktNGXOHkmLaYRg@mail.gmail.com> In-Reply-To: <BEAC6EE9-C50F-4FB9-B215-D5A6691E2DD9@webweaving.org> References: <BEAC6EE9-C50F-4FB9-B215-D5A6691E2DD9@webweaving.org>
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On Wed, Dec 14, 2016 at 8:27 AM, Dirk-Willem van Gulik <dirkx@webweaving.org> wrote: > A rather odd directory entry (in /root, the home dir of root/toor) appeared on a bog standard FreeBSD 10.2 (p18) lightly loaded machine under ZFS during/post a backup: > > $ ls -la /root | tail -q > ---------- 1 root wheel 9223372036854775807 Jan 1 1970 ?%+?kD?H???x,?5?Dh;*s!?h???jw??????\h?:????????``?13?@?????OA????????Puux????<T]???R??Qv?g???]??%?R? > > OS and ZFS is installed with a bog standard sysinstall. ‘SMART’ nor smartd have reported anything. nothing in dmesg, syslog of boot log. Any suggestions as how to debug or get to the root of this ? > > And in particular - what is a risk of a reboot (to get a kernel with debug, etc) causing the issue to ‘go away’ - and hence stopping the forensic ? > > Dw. > > sudo zpool list -v > NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT > tank 25.2T 9.27T 16.0T - 17% 36% 1.53x ONLINE - > raidz3 25.2T 9.27T 16.0T - 17% 36% > ada0p3 - - - - - - > ada1p3 - - - - - - > ada2p3 - - - - - - > ada3p3 - - - - - - > ada4p3 - - - - - - > ada5p3 - - - - - - > ada6p3 - - - - - - Two things to try: 1) zpool scrub. This will reveal any corrupt metadata objects 2) Maybe the filename is created in an encoding not supported by your current terminal. Try "LANG=en_US.UTF-8 ls -l" 3) Use zdb to examine the file. First, do "ls -li /root" to get the object id. It's the same as the inode number. Then, assuming /root is in the tank/root filesystem, do "zdb -ddddd tank/root <object id>". That might reveal some clues. -Alan
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