Re: arm32: panic in move_freepages (Was [PATCH v2 0/4] arm64: drop... | linux-arm-kernel

(off-list ancestor, not in this archive)

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.

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Re: arm32: panic in move_freepages (Was [PATCH v2 0/4] arm64: drop pfn_valid_within() and simplify pfn_valid())

Possibly related (same subject, not in this thread)