On Fri, Sep 11, 2020 at 2:34 PM Roman Gushchin guro@fb.com wrote:
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Also have you taken a look at [1]? I am still trying to figure out how that is possible.
[1] https://lore.kernel.org/lkml/20200901075321.GL4299@shao2-debian/
Hm, yeah, it's complicated. At the very first glance it looks like that the obj_cgroups vector is placed onto the very same page it describes, or at least it shares the kmem_cache with it, with some bad consequences. Could be something SLAB-specific, newer saw anything like that with SLUB. Or maybe it's completely unrelated and has been attributed to this commit by mistake.
I've spent several hours running the provided test in a loop, but wasn't lucky enough to trigger it. Did you try?
Yeah same, no success in reproducing it.