Messages in this thread | | | Date | Wed, 12 May 2021 04:50:47 +0100 | From | Matthew Wilcox <> | Subject | Re: arm32: panic in move_freepages (Was [PATCH v2 0/4] arm64: drop pfn_valid_within() and simplify pfn_valid()) |
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On Sun, Apr 25, 2021 at 03:51:56PM +0800, Kefeng Wang wrote: > we see the PC is at PageLRU, same reason like arm64 panic log, > > "PageBuddy in move_freepages returns false Then we call PageLRU, the macro > calls PF_HEAD which is compound_page() compound_page reads > page->compound_head, it is 0xffffffffffffffff, so it resturns > 0xfffffffffffffffe - and accessing this address causes crash"
Oh. I posted patches to fix this back in 2018.
https://lore.kernel.org/linux-mm/20180414043145.3953-6-willy@infradead.org/
and 2019.
https://lore.kernel.org/linux-mm/20190501202433.GC28500@bombadil.infradead.org/
and 2020.
https://lore.kernel.org/linux-mm/20200408150148.25290-6-willy@infradead.org/
Looks like it's about that time of year for me to try to fix this again.
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