Messages in this thread | | | Date | Fri, 13 Feb 2009 05:47:51 +0000 | From | Al Viro <> | Subject | Re: [cgroup or VFS ?] WARNING: at fs/namespace.c:636 mntput_no_expire+0xac/0xf2() |
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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. 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?
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