Date: Fri, 27 Feb 1998 20:21:09 +0000 (WET) From: freebsd@bug.fe.up.pt To: Andre Albsmeier <andre.albsmeier@mchp.siemens.de> Cc: freebsd-questions@FreeBSD.ORG, hackers@FreeBSD.ORG, jkh@time.cdrom.com Subject: Re: 2.2.5-STABLE: is this a bug in umount? Message-ID: <Pine.BSF.3.96.980227201611.251A-200000@slug.EUnet.pt> In-Reply-To: <199802271717.SAA00672@intern>
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Hi!
I did a kernel debug on it and here is the log of the debug (I've
included an attachment with the full log):
(kgdb) down
#9 0xf01318fc in unmount (p=0xf1509800, uap=0xefbfff94, retval=0xefbfff84)
at ../../kern/vfs_syscalls.c:280
280 return (dounmount(mp, uap->flags, p));
(kgdb) list
275 * Don't allow unmount of the root filesystem
276 */
277 if (mp->mnt_flag & MNT_ROOTFS)
278 return (EINVAL);
279
280 return (dounmount(mp, uap->flags, p));
281 }
282
283 /*
284 * Do the actual file system unmount.
(kgdb) exit
The solution is to add an if before the return checking if there is
activity in that partition. The way to do that I'll leave to the
core team or someone with commit priviliges.
Jorge
--
\\ Nobody can be exactly like me. \\ Jorge Miguel Goncalves
\\ Sometimes even I have trouble \\
\\ doing it. \\ j@bug.fe.up.pt
\\ -- Talluulah Bankhead \\
On Fri, 27 Feb 1998, Andre Albsmeier wrote:
> Hi,
>
> let's assume the following (done as root):
>
> mount /dev/sd3c /mnt
> tar cf /mnt/bla.tar some_big_directory
>
> While the tar is running we do the following in another shell:
>
> umount /mnt
>
> If we see a "Device busy" error we just repeat the umount again and again.
> Suddenly the system freezes for about 10 seconds and reboots. During the
> bootstrap the following message appears:
>
> bali daemon.alert savecore: reboot after panic: vinvalbuf: dirty bufs
>
>
> Now my question is: Is this the expected behaviour from umount? If you ask
> me why I do such a silly thing, it's because I mount my portable disk drive
> with amd. Then I start a timeconsuming job on this drive (in my case a tar
> from the network). After the default timeout of 5 minutes the amd unmounts
> the fs and the system crashes. I can reproduce this if you tell me.
>
> All that happens on a FreeBSD 2.2.5-STABLE system.
>
> Is this a bug (so I will send in a PR) or a feature?
>
> Thanks,
>
> -Andre
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with "unsubscribe freebsd-hackers" in the body of the message
>
>
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