Date: Tue, 12 Feb 2008 10:52:59 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: Joe Peterson <joe@skyrush.com> Cc: freebsd-stable@freebsd.org Subject: Re: mount of ext2fs volume stuck in "D+" state (disk uninterruptible wait) Message-ID: <47B16C7B.1040803@FreeBSD.org> In-Reply-To: <47B0F406.6060206@skyrush.com> References: <47B0EA08.10202@skyrush.com> <47B0F117.4030105@FreeBSD.org> <47B0F406.6060206@skyrush.com>
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Joe Peterson wrote: > Kris Kennaway wrote: >> Joe Peterson wrote: >>> I just tried (under FreeBSD 7.0-RC1) to mount an ext2fs volume - I've >>> mounted it before with no trouble on this same FreeBSD version. This >>> time, mount appeared to hang. I noticed that I can see the contents of >>> the volume under the mount point, so the mount seemed to "work", but the >>> process is stuff. "ps" shows: >>> >>> root 1307 0.0 0.0 3156 792 p6 D+ 5:21PM 0:00.00 mount >>> /mnt/linux-home >>> >>> The "ps" man page says that "D" means: "Marks a process in disk (or >>> other short term, uninterruptible) wait." >>> >>> Is there any way I can investigate what is going on? I cannot umount >>> (device busy) or break out of the mount command... >> http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug.html > > But unfortunately I do not have KDB and DDB compiled into the kernel. > And, obviously, if I reboot, I will lose this opportunity. I suspect > this to be an intermittent thing. Is there anything I can extract while > the system is running that would be useful? > > Thanks, Joe > > You can run kgdb on /dev/mem to obtain the backtrace. Kris
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