On Thu, Sep 27, 2018 at 10:43:40PM +0800, zhong jiang wrote: > From: Alexey Dobriyan <adobriyan@xxxxxxxxx> > > /* > * cpu_partial determined the maximum number of objects > * kept in the per cpu partial lists of a processor. > */ > > Can't be negative. > > I hit a real issue that it will result in a large number of memory leak. > Because Freeing slabs are in interrupt context. So it can trigger this issue. > put_cpu_partial can be interrupted more than once. > due to a union struct of lru and pobjects in struct page, when other core handles > page->lru list, for eaxmple, remove_partial in freeing slab code flow, It will > result in pobjects being a negative value(0xdead0000). Therefore, a large number > of slabs will be added to per_cpu partial list. > > I had posted the issue to community before. The detailed issue description is as follows. > > Link: https://www.spinics.net/lists/kernel/msg2870979.html > > After applying the patch, The issue is fixed. So the patch is a effective bugfix. > It should go into stable. <formletter> This is not the correct way to submit patches for inclusion in the stable kernel tree. Please read: https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html for how to do this properly. </formletter>
