Re: arm32: panic in move_freepages (Was [PATCH v2 0/4] arm64: drop pfn_valid_within() and simplify pfn_valid())
From: Matthew Wilcox <willy@infradead.org>
Date: 2021-05-12 03:51:45
Also in:
kvmarm, linux-mm, lkml
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/ (local) and 2019. https://lore.kernel.org/linux-mm/20190501202433.GC28500@bombadil.infradead.org/ (local) and 2020. https://lore.kernel.org/linux-mm/20200408150148.25290-6-willy@infradead.org/ (local) Looks like it's about that time of year for me to try to fix this again. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel