On Thu, 27 Sep 2018, zhong jiang wrote:
From: Alexey Dobriyan adobriyan@gmail.com
/* * cpu_partial determined the maximum number of objects * kept in the per cpu partial lists of a processor. */Can't be negative.
True.
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.
That sounds like it needs more investigation. Concurrent use of page fields for other purposes can cause serious bugs.
I had posted the issue to community before. The detailed issue description is as follows.
I did not see it. Please make sure to CC the maintainers.