Date: Wed, 16 Nov 2011 11:35:04 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-hackers@freebsd.org Subject: Re: The zombie has involved into /dev/null Message-ID: <ja03kp$d6t$1@dough.gmane.org> In-Reply-To: <565501321311150@web150.yandex.ru> References: <565501321311150@web150.yandex.ru>
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[-- Attachment #1 --] So, if I understand you correctly, you are reporting a bug in which a jailed process is holding (the jailed instance of) /dev/null open and "umount -f" doesn't work on the jailed /dev ? On 14/11/2011 23:52, Slono Slono wrote: > On one of servers where installed cacti in jail there is strange enough situation. Sometimes processes poller.php haven't time to successful complete until to beginning of the following session (absence of lock is other problem - its ok) therefore processes breed yet won't begin them kill. During such moments appear zombie processes. However, these zombie show that keep devfs the device. Possibly because are started as > > php <path_to_poller>/poller.php 2>/dev/null 2>&1 > > Sending of any signals (SIGCHILD too) changes nothing. Strange that with -f (force) optons through a umount command is impossible to unmount devfs with which worked as the zombie. > > ps axf shows: > .. > > 99551 ?? DsJ 0:00.12 /usr/local/bin/php /usr/local/share/cacti/poller.php > 99554 ?? ZJ 0:00.02 <defunct> > . > > lsof -p 99551 > COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME > php 99551 root cwd VBAD (revoked) > php 99551 root rtd VDIR 225,1035534442 3 678909 /usr/jails/jails/mon > php 99551 root jld VDIR 225,1035534442 3 678909 /usr/jails/jails/mon > php 99551 root txt VREG 225,1035534442 3261754 1620922 /usr/jails/jails-data/mon-data/usr/local/bin/php > php 99551 root txt VREG 225,1035534442 246776 626780 /usr/jails/jails-data/mon-data/libexec/ld-elf.so.1 > php 99551 root txt VREG 225,1035534442 33600 626862 /usr/jails/jails-data/mon-data/lib/libcrypt.so.5 > php 99551 root txt VREG 225,1035534442 377814 1267501 /usr/jails/jails-data/mon-data/usr/local/lib/libpcre.so.0 > php 99551 root txt VREG 225,1035534442 150656 626861 /usr/jails/jails-data/mon-data/lib/libm.so.5 > php 99551 root txt VREG 225,1035534442 1495740 649173 /usr/jails/jails-data/mon-data/usr/local/lib/libxml2.so.5 > php 99551 root txt VREG 225,1035534442 84848 626828 /usr/jails/jails-data/mon-data/lib/libz.so.5 > php 99551 root txt VREG 225,1035534442 1074175 649584 /usr/jails/jails-data/mon-data/usr/local/lib/libiconv.so.3 > php 99551 root txt VREG 225,1035534442 1270640 626857 /usr/jails/jails-data/mon-data/lib/libc.so.7 > php 99551 root txt VREG 225,1035534442 74189 636259 /usr/jails/jails-data/mon-data/usr/local/lib/php/20090626/session.so > php 99551 root txt VREG 225,1035534442 63195 637380 /usr/jails/jails-data/mon-data/usr/local/lib/php/20090626/xml.so > php 99551 root txt VREG 225,1035534442 40650 638507 /usr/jails/jails-data/mon-data/usr/local/lib/php/20090626/snmp.so > php 99551 root txt VREG 225,1035534442 337128 665903 /usr/jails/jails-data/mon-data/usr/lib/libssl.so.6 > php 99551 root txt VREG 225,1035534442 730269 8050234 /usr/jails/jails-data/mon-data/usr/local/lib/libnetsnmp.so.30 > php 99551 root txt VREG 225,1035534442 35264 626850 /usr/jails/jails-data/mon-data/lib/libkvm.so.5 > php 99551 root txt VREG 225,1035534442 19720 626858 /usr/jails/jails-data/mon-data/lib/libdevstat.so.7 > php 99551 root txt VREG 225,1035534442 1693344 626824 /usr/jails/jails-data/mon-data/lib/libcrypto.so.6 > php 99551 root txt VREG 225,1035534442 105904 666224 /usr/jails/jails-data/mon-data/usr/lib/libelf.so.1 > php 99551 root txt VREG 225,1035534442 61034 635955 /usr/jails/jails-data/mon-data/usr/local/lib/php/20090626/mysql.so > php 99551 root txt VREG 225,1035534442 54114 637132 /usr/jails/jails-data/mon-data/usr/local/lib/php/20090626/sockets.so > php 99551 root 0u PIPE 0xfffffe07514ab5b0 16384 ->0xfffffe07514ab708 > php 99551 root 1w VCHR 0,27 0t0 27 /usr/jails/jails/mon/dev (devfs) (like character special /dev/null) > php 99551 root 2w VCHR 0,27 0t0 27 /usr/jails/jails/mon/dev (devfs) (like character special /dev/null) > php 99551 root 3u unix 0xfffffe074ad832a8 0t0 ->(none) > php 99551 root 5u PIPE 0xfffffe043c62fcb8 0 ->0xfffffe043c62fb60 > > mount -t devfs |grep mon > devfs on /usr/jails/jails/mon/dev (devfs, local, multilabel) > > umount -f /usr/jails/jails/mon/dev > umount: unmount of /usr/jails/jails/mon/dev failed: Device busy > > However apparently devfs is unmount when executed jail stop: > > ls -la /usr/jails/jails/mon/dev > total 5 > drwxr-xr-x 2 root wheel 2 Nov 14 22:36 . > drwxr-xr-x 3 root wheel 3 Nov 14 22:36 .. > > As can be that zombie blocks devfs or that in system there is an information on active mount when the file system isn't present > > PS: FreeBSD 9.0-RC2 amd64 > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" > [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk7DkdkACgkQldnAQVacBcgpEACcC6w9Lh/3qQ9z5hsITeizknGK uO8AoJ+GIclwph9hUcuLbHClFyr84i1T =USHk -----END PGP SIGNATURE-----
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