It looks like a serious problem, because the loop update does a
dereference of the first argument of list_for_each via list_entry.
julia
On Mon, 7 Sep 2015, kbuild test robot wrote:
> TO: Joseph Qi <joseph.qi@xxxxxxxxxx>
> CC: kbuild-all@xxxxxx
> CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> CC: Linux Memory Management List <linux-mm@xxxxxxxxx>
>
> tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: 7d9071a095023cd1db8fa18fa0d648dc1a5210e0
> commit: f83c7b5e9fd633fe91128af116e6472a8c4d29a5 ocfs2/dlm: use list_for_each_entry instead of list_for_each
> date: 3 days ago
> :::::: branch date: 33 hours ago
> :::::: commit date: 3 days ago
>
> >> fs/ocfs2/dlm/dlmrecovery.c:1824:4-23: iterator with update on line 1827
>
> git remote add linus git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> git remote update linus
> git checkout f83c7b5e9fd633fe91128af116e6472a8c4d29a5
> vim +1824 fs/ocfs2/dlm/dlmrecovery.c
>
> 6714d8e8 Kurt Hackel 2005-12-15 1818 BUG_ON(!(mres->flags & DLM_MRES_MIGRATION));
> 6714d8e8 Kurt Hackel 2005-12-15 1819
> 34aa8dac Junxiao Bi 2014-04-03 1820 lock = NULL;
> 6714d8e8 Kurt Hackel 2005-12-15 1821 spin_lock(&res->spinlock);
> e17e75ec Kurt Hackel 2007-01-05 1822 for (j = DLM_GRANTED_LIST; j <= DLM_BLOCKED_LIST; j++) {
> e17e75ec Kurt Hackel 2007-01-05 1823 tmpq = dlm_list_idx_to_ptr(res, j);
> f83c7b5e Joseph Qi 2015-09-04 @1824 list_for_each_entry(lock, tmpq, list) {
> 34aa8dac Junxiao Bi 2014-04-03 1825 if (lock->ml.cookie == ml->cookie)
> 6714d8e8 Kurt Hackel 2005-12-15 1826 break;
> 34aa8dac Junxiao Bi 2014-04-03 @1827 lock = NULL;
> 6714d8e8 Kurt Hackel 2005-12-15 1828 }
> e17e75ec Kurt Hackel 2007-01-05 1829 if (lock)
> e17e75ec Kurt Hackel 2007-01-05 1830 break;
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all Intel Corporation
>
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