tj@xxxxxxxxxx wrote:
> On Sun, Jun 24, 2012 at 07:08:07PM +0000, shyju pv wrote:
>> Hi,
>> Observed a crash on 3.5-rc3 with cgroup tests from LTP(Stable April,2012 release)on Dell Inspiron 1526[Intel(R) Core2Duo T7250, MEM 4GB] and also on another x86 quad core target(4GB RAM).
>> LTP test case: cgroup_regression_test.sh(test 4,7 and 9 crashes randomly when the test cases are executed in order)
I wrote thoese test scripts. ;)
>> Shyju
>>
>> [ 532.805905] BUG: Dentry ffff8801164db490{i=491b,n=/} still in use (1) [unmount of cgroup cgrou
>
> Hmm... fa980ca87d "cgroup: superblock can't be released with active
> dentries" is supposed to have fixed that. Looking into it.
>
I think I know what happened here:
umount
deativate_super(sb)
dput(subdir)
subdir->d_count--
d_release(subdir)
deactivate_super(sb)
shrink_dcache_for_umount(sb)
BUG(root->d_count)!!
root->d_count--
I use this script to reproduce the bug:
mount -t cgroup -o cpu xxx /mnt
mkdir /mnt/sub
sleep 100 < /mnt/sub &
kill $!
wait $!
rmdir /mnt/sub
umount /mnt
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