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SubjectRe: [PATCH v7 00/12] Support non-lru page migration
On (06/16/16 15:47), Minchan Kim wrote:
> > [..]
> > > > this is what I'm getting with the [zsmalloc: keep first object offset in struct page]
> > > > applied: "count:0 mapcount:-127". which may be not related to zsmalloc at this point.
> > > >
> > > > kernel: BUG: Bad page state in process khugepaged pfn:101db8
> > > > kernel: page:ffffea0004076e00 count:0 mapcount:-127 mapping: (null) index:0x1
> > >
> > > Hm, it seems double free.
> > >
> > > It doen't happen if you disable zram? IOW, it seems to be related
> > > zsmalloc migration?
> >
> > need to test more, can't confidently answer now.
> >
> > > How easy can you reprodcue it? Could you bisect it?
> >
> > it takes some (um.. random) time to trigger the bug.
> > I'll try to come up with more details.
>
> Could you revert [1] and retest?
>
> [1] mm/compaction: split freepages without holding the zone lock

ok, so this is not related to zsmalloc. finally manged to reproduce
it. will fork a separate thread.

-ss

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