Messages in this thread | | | Date | Thu, 28 Jun 2012 14:07:51 +0800 | From | Li Zefan <> | Subject | Re: 3.5-rc3: BUG: Dentry still in use (1) [unmount of cgroup cgroup] |
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tj@kernel.org 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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