Messages in this thread | | | Date | Mon, 09 Feb 2009 19:30:20 +0800 | From | Li Zefan <> | Subject | Re: [cgroup or VFS ?] WARNING: at fs/namespace.c:636 mntput_no_expire+0xac/0xf2() |
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Al Viro wrote: > On Mon, Feb 09, 2009 at 12:40:46AM -0800, Andrew Morton wrote: >>> Thread 1: >>> for ((; ;)) >>> { >>> mount -t cgroup -o cpuset xxx /mnt > /dev/null 2>&1 >>> mkdir /mnt/0 > /dev/null 2>&1 >>> rmdir /mnt/0 > /dev/null 2>&1 >>> umount /mnt > /dev/null 2>&1 >>> } >>> >>> Thread 2: >>> { >>> mount -t cpuset xxx /mnt > /dev/null 2>&1 >>> umount /mnt > /dev/null 2>&1 >>> } > > How cute... Same mountpoint in both, so these mount(2) will sometimes > fail (cgroup picks the same sb on the same options, AFAICS) and fail > silently due to these redirects... > > That's a lovely way to stress-test a large part of ro-bind stuff *and* > umount()-related code. Could you do C equivalent of the above (just > the same syscalls in loop, nothing fancier) and do time-stamped strace? >
Sure, I'll write a C version and try to reproduce the warning.
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