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SubjectRe: [cgroup or VFS ?] WARNING: at fs/namespace.c:636 mntput_no_expire+0xac/0xf2()
Al Viro wrote:
> On Fri, Feb 13, 2009 at 01:09:17PM +0800, Li Zefan wrote:
>
>> I ran following testcase, and triggered the warning in 1 hour:
>>
>> thread 1:
>> for ((; ;))
>> {
>> mount --bind /cgroup /mnt > /dev/null 2>&1
>> umount /mnt > /dev/null 2>&1
>> }
>>
>> tread 2:
>> for ((; ;))
>> {
>> mount -t cgroup -o cpu xxx /cgroup > /dev/null 2>&1
>> mkdir /cgroup/0 > /dev/null 2>&1
>> rmdir /cgroup/0 > /dev/null 2>&1
>> umount -l /cgroup > /dev/null 2>&1
>> }
>
> Wow. You know, at that point these redirects could probably be removed.

Ah, yes.

> If anything in there ends up producing an output, we very much want to
> see that. Actually, I'd even make that
> mount --bind /cgroup/mnt || (echo mount1: ; date)
> etc., so we'd see when do they fail and which one fails (if any)...
>
> Which umount has failed in the above, BTW?
>
>

the first one sometimes failed, and the second one hasn't failed:

mount: wrong fs type, bad option, bad superblock on /cgroup,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so

mount1
Fri Feb 13 14:05:37 CST 2009
umount: /mnt: not mounted
mount: wrong fs type, bad option, bad superblock on /cgroup,
...

mount1
Fri Feb 13 14:08:34 CST 2009
umount: /mnt: not mounted
mount: wrong fs type, bad option, bad superblock on /cgroup,
...

mount1
Fri Feb 13 14:08:43 CST 2009
umount: /mnt: not mounted
mount: wrong fs type, bad option, bad superblock on /cgroup,
...




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