Date: Mon, 26 Oct 2015 11:44:25 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: freebsd-questions@freebsd.org Subject: Re: cd /.zfs/snapshot hangs (tmux put to uninterruptible sleep) Message-ID: <562E1219.4080203@infracaninophile.co.uk> In-Reply-To: <562E0DDA.3020202@freebsd.org> References: <562CB2C2.6090402@kulturflatrate.net> <562CB8CF.7010504@FreeBSD.org> <562CC1DD.9060207@kulturflatrate.net> <562CC308.6060901@FreeBSD.org> <562CC547.8080308@kulturflatrate.net> <562CC7B6.5040404@FreeBSD.org> <562CC939.5060807@kulturflatrate.net> <562E0DDA.3020202@freebsd.org>
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[-- Attachment #1 --] On 10/26/15 11:26, Matthew Seaman wrote: > On 10/25/15 12:21, Niklaas Baudet von Gersdorff wrote: >> On 25/10/15 13:14, Matthew Seaman wrote: >>> Please do go ahead and reset your system. Just realizing it's happening >>> to other people than me is sufficient incentive. >> >> OK. Thanks a lot for your help! >> >>> PS. If you need to access one of the troublesome snapshots, use 'zfs >>> clone' -- it seems to avoid the various pitfalls. >> >> OK. Great. >> > > Hmmm... I can't reproduce the problematic effect. I set up a zfs with > snapshots like so: > > # zfs list -t all -r tank/.......1 > NAME > USED AVAIL REFER MOUNTPOINT > tank/.......1 > 19K 769G 19K /.......1 > tank/.......1@....3.........4.........5.........6.........7.........8........ > 0 - 19K - > tank/.......1@....3.........4.........5.........6.........7.........8......... > 0 - 19K - > tank/.......1@....3.........4.........5.........6.........7.........8.........9.........0 > 0 - 19K - > > where the contents of the ZFS were: > > # find /.......1 > /.......1 > /.......1/aaa > /.......1/aaa/bbb > /.......1/aaa/bbb/ccc > > Sorry about the funky filenames -- they're just for counting the > characters in the automount path for the snapshot. The result is like > so (if you can make it out despite the line wrapping my mail client > wants to add): > > # find /.......1/.zfs/snapshot > /.......1/.zfs/snapshot > find: > /.......1/.zfs/snapshot/....3.........4.........5.........6.........7.........8.........: > File name too long > /.......1/.zfs/snapshot/....3.........4.........5.........6.........7.........8........ > /.......1/.zfs/snapshot/....3.........4.........5.........6.........7.........8......../aaa > /.......1/.zfs/snapshot/....3.........4.........5.........6.........7.........8......../aaa/bbb > /.......1/.zfs/snapshot/....3.........4.........5.........6.........7.........8......../aaa/bbb/ccc > find: > /.......1/.zfs/snapshot/....3.........4.........5.........6.........7.........8.........9.........0: > File name too long > > # cd > /.......1/.zfs/snapshot/....3.........4.........5.........6.........7.........8.........9.........0/aaa/bbb > > /.......1/.zfs/snapshot/....3.........4.........5.........6.........7.........8.........9.........0/aaa/bbb: > File name too long. > > > ie. a mounted path length of 88 characters is OK, but 89 or 100 > characters gets the 'name too long' error. However, I can't detect any > problems after that. No processes stuck trying to do IO. So I guess > that whatever the problem was, it has been fixed in 10.2-RELEASE > > Cheers, > > Matthew > > Actually, here is the problem: stingray:/:# zfs destroy -r tank/.......1 cannot unmount '/.......1': Device busy But that is easily fixed by: stingray:/:# zfs umount -f /.......1 stingray:/:# zfs destroy -r tank/.......1 I wonder if that's worth a PR? I recall now this is exactly what I ran into before, but it seems rather different to what you're seeing. Cheers, Matthew [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iQIcBAEBCgAGBQJWLhIZAAoJEABRPxDgqeTnIbwP/it9lXeFVsX2V08n08SLHy47 hhyeRKz2ORXlpdUTxYmAoQhPHtjgN8BGWZQ9OnB9yFaXiIAH3Gx8NU2avfSDQDqp OVuOvsqL9e5eXzSTU02xwwRf16rqchNAPEvJNPp/49KCdNxb9t/vcVupYEyWkwFK 1tjdgVUBVy8O+Pbc8Olj/totdsnewFfrxPzPcR3+qigNf8oWNo1vjnfzdyYo4lSK kcDuwY3+3Nhvu4zWm6L1C94DRglVuSgkKEyzWFLSAPQ6Wv73dgxI1UHEm0dTQ1yX MFuGZmcOG0CGSHbBm9ftTezuwSQmxVfd4bea92cd7Ab/2Fw2WyyDzlCxdHz3196L 5mg9DWC4dI8AbgJfOQN4hXcwTB9YJjTX54QJjBn8yZIqdURcTkpWI/9sKIQ0bya5 dAOEqpIGxr9kKqLMU2Z645vmOghqqNoanN7VIIFqfFD4lfO1N5V81pQ5ZU9440Nm wKsdAsGmgNQ8PPmDLP5ONWfmxGtzeTpKT9QfYGyJzJpHsqkKnph/fo196+RKDHwy Z4DHGViIIbxfP9x5+5Uokazo7U8pyX3uMf2eZlc4p7ukFJjU/R8aChVVjPb0AAgB FHYWaA3KOHf3toGEZzeQ3UfaBYJP2X34U/uTl4+ojaCSkEzdCwqyB+tEnfBJVMIm /zr/ShEnTQMtmg58rsrX =Ssvl -----END PGP SIGNATURE-----home | help
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