[linux-lvm] new process dead after create multiple snapshot volumes
Bear Wolf
sportbear at gmail.com
Mon Sep 19 01:35:09 UTC 2005
Thank you Ellenberg.
now I learn more things..^_^
should I put this at Redhat Bugzila?
because it's always reproducible with RH-FC3,
"demsetup resume target &" still not work..
2005/9/18, Lars Ellenberg <Lars.Ellenberg at linbit.com>:
> / 2005-09-17 14:27:10 +0800
> it is not "dead", it is in "uninteruptible sleep".
> that is a big difference.
>
> yes, those are the kernel threads responsible for the sync.
> there are initially two of them per cpu.
> if they (try to) sync to some device mapper target which is suspended,
> they themselves get suspended.
> this can hang the system: no io possible, nothing possible
> anymore that needs io...
>
> > -bash-3.00# ps x
> > PID TTY STAT TIME COMMAND
> > 1 ? S 0:01 init [2]
> > 2 ? S 0:00 [migration/0]
> > 3 ? SN 0:00 [ksoftirqd/0]
> > 4 ? S< 0:00 [events/0]
> > 5 ? S< 0:00 [khelper]
> > 6 ? S< 0:00 [kthread]
> > 8 ? S< 0:00 [kacpid]
> > 70 ? S< 0:00 [kblockd/0]
> > 73 ? S< 0:00 [khubd]
> > 129 ? S 0:00 [pdflush]
> > 130 ? D 0:00 [pdflush]
> > 132 ? S< 0:00 [aio/0]
> > 131 ? S 0:00 [kswapd0]
> > 134 ? S< 0:00 [xfslogd/0]
> > 133 ? S 0:00 [cifsoplockd]
> > 135 ? S< 0:00 [xfsdatad/0]
> > 136 ? S 0:00 [xfsbufd]
> > 723 ? S< 0:00 [kseriod]
> > 773 ? S 0:00 [scsi_eh_0]
> > 777 ? S< 0:00 [ata/0]
> > 801 ? S< 0:00 [kcryptd/0]
> > 934 ? S< 0:00 [kcopyd]
> > 1330 ? Ss 0:00 syslogd -m 0
> > 1334 ? Ss 0:00 klogd -x
> > 1343 ? Ss 0:00 /usr/httpd/bin/httpd
> > 1353 ? Ss 0:00 crond
> > 1359 ? Ss 0:00 /bin/profamd
> > 1479 tty1 Ss 0:00 -bash
> > 1481 tty2 Ss+ 0:00 -bash
> > 1483 tty3 Ss+ 0:00 /sbin/mingetty tty3
> > 1485 tty4 Ss+ 0:00 /sbin/mingetty tty4
> > 1487 tty5 Ss+ 0:00 /sbin/mingetty tty5
> > 1903 ? S 0:00 [xfssyncd]
> > 1915 tty1 D+ 0:00 sync
> > 2037 pts/0 R+ 0:00 ps x
>
> --
> : Lars Ellenberg Tel +43-1-8178292-0 :
> : LINBIT Information Technologies GmbH Fax +43-1-8178292-82 :
> : Schoenbrunner Str. 244, A-1120 Vienna/Europe http://www.linbit.com :
>
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