Re: [PATCH v11 07/14] mm: multi-gen LRU: exploit locality in rmap
From: Barry Song <hidden>
Date: 2022-06-08 08:23:03
Also in:
linux-doc, linux-mm, lkml
On Wed, Jun 8, 2022 at 7:07 AM Yu Zhao [off-list ref] wrote:
On Tue, Jun 7, 2022 at 1:37 AM Barry Song [off-list ref] wrote:quoted
On Mon, Jun 6, 2022 at 9:25 PM Barry Song [off-list ref] wrote:quoted
On Wed, May 18, 2022 at 4:49 PM Yu Zhao [off-list ref] wrote:...quoted
I can't really explain why we are getting a random app/java vm crash in monkey test by using ptep_test_and_clear_young() only in lru_gen_look_around() on an armv8-a machine without hardware PTE young support. Moving to ptep_clear_flush_young() in look_around can make the random hang disappear according to zhanyuan(Cc-ed).This sounds too familiar -- let me ask again: was the following commit included during the test? 07509e10dcc7 arm64: pgtable: Fix pte_accessible() If not, it will cause exactly the problem you described. And what about this one? e914d8f00391 mm: fix unexpected zeroed page mapping with zram swap Missing it also causes userspace memory corruption on Android, i.e., random app crashes.
According to zhanyuan's testing, we can confirm the above two commits can fix the random android crash. Thanks Barry _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel