Date: Fri, 21 Nov 2008 10:39:58 +0200 From: Nikolay Denev <ndenev@gmail.com> To: Thomas Vogt <freebsdlists@bsdunix.ch> Cc: current@freebsd.org Subject: Re: deadlock with zfs? Message-ID: <B647D506-25CB-4314-BB1B-E9AD5044C92C@gmail.com> In-Reply-To: <F1687236-D85B-467F-9884-AABE9EA64C6C@bsdunix.ch> References: <F1687236-D85B-467F-9884-AABE9EA64C6C@bsdunix.ch>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 21 Nov, 2008, at 02:01 , Thomas Vogt wrote: > Hello > > I encounter a deadlock while running a few rsync processes mirroring > remote data to my local zfs pool. After a few hours my system is > starting more and more vsftpd sessions without closing any inactive > ftp sessions. I can't kill any rsync and vsftpd processes with "kill > -9". Even shutdown -r now does not work. > > I got a few hunderts vsftpd processes like this > > 61346 root 1 57 0 7880K 1692K zfs 1 0:00 0.00% > vsftpd > 61481 root 1 68 0 7880K 1696K zfs 1 0:00 0.00% > vsftpd > 61354 root 1 65 0 7880K 1692K zfs 1 0:00 0.00% > vsftpd > 61480 root 1 68 0 7880K 1696K zfs 0 0:00 0.00% > vsftpd > 61600 root 1 69 0 7880K 1704K zfs 1 0:00 0.00% > vsftpd > 61599 root 1 68 0 7880K 1704K zfs 1 0:00 0.00% > vsftpd > > Right now i'm building a debug kernel. Whats the best way to get > usefull information from this deadlock? The system itself is not > crashing and response well to ssh and i also have a serial console. > > The system is running 8.0-CURRENT Thu Nov 20 00:15:46 UTC 2008 > (64bit) with zpool version 13. I use zfs only as data pool. The base > system is running on ufs2: > > Filesystem Size Used Avail Capacity Mounted on > /dev/da0s1a 496M 220M 236M 48% / > devfs 1.0K 1.0K 0B 100% /dev > /dev/da0s1g 169G 15G 141G 9% /disk1 > /dev/da0s1f 3.9G 17M 3.5G 0% /tmp > /dev/da0s1e 29G 3.7G 23G 14% /usr > /dev/da0s1d 19G 7.1G 11G 40% /var > pool 853G 0B 853G 0% /usr/local/data > pool/cvsup 858G 5.7G 853G 1% /usr/local/data/cvsup > pool/ftp 3.3T 2.5T 853G 75% /usr/local/data/ftp > pool/portsnap 853G 633M 853G 0% /usr/local/data/ > portsnap > pool/www 853G 90M 853G 0% /usr/local/data/www > > loader.conf: > vm.kmem_size="1G" > kern.maxfiles="65536" > kern.maxproc="20480" > net.inet.tcp.tcbhashsize="4096" > net.inet.tcp.hostcache.hashsize="1024" > vfs.zfs.arc_min="64M" > vfs.zfs.arc_max="768M" > vfs.zfs.prefetch_disable="1" > > I also tried to set vfs.zfs.zil_disable=1 but the problem still exist. > > I know there are few deadlock reports listed in the freebsd wiki. > Maybe we can trigger the root cause of the problem and fix it :) > > Regards > Thomas > Hi Thomas, from my recent experience it seems that tuning vm.kmem_size is no longer required, maybe you can try without it. - -- Regards, Nikolay Denev -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (Darwin) iEYEARECAAYFAkkmc94ACgkQHNAJ/fLbfrlQNwCfYOgJoxqPMUeQ0JNsuES1Gd7a T8QAnjf/bAj3LIUDjZlRIoFHkNl9l62q =hVLJ -----END PGP SIGNATURE-----
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