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 jjXKox3D o6E/puLvk2eI9APINEHwyxeUKoHpWt7lKu4F6f+r9u8PBz/xByf3gnA5A7T2+TpXMd/1OB7FjW4Qelewd1Y+Q60jVHtPdIblxWJmJ X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 1/17/2023 3:39 PM, Vlastimil Babka wrote: > So either the assumption of refcount being already 0 is wrong (shouldn't be, > AFAIK?), or this atomic operation effectively prevents some very subtle race > (although IIRC atomic_set() has no barrier semantics defined, it could still > affect a specific CPU? Is there difference of atomic_set() for 32bit and 64bit? This issue is only triggered on 32bit configuration. > > I guess we could > - try to restore that set_page_count(p, 0); on current kernel to see if it > kills the bug I tried this. But didn't try too hard. 20 times reboot didn't trigger the issue with this line added to commit 0af8489b02. Without this line, hit the issue 4 times in 10 times reboot testing. Regards Yin, Fengwei