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dkim=pass header.d=nokia.onmicrosoft.com header.s=selector1-nokia-onmicrosoft-com header.b=GnM4qnaV; dmarc=fail reason="No valid SPF, DKIM not aligned (relaxed)" header.from=nokia.com (policy=none); spf=none (imf05.hostedemail.com: domain of alexander.sverdlin@nokia.com has no SPF policy when checking 40.107.14.122) smtp.mailfrom=alexander.sverdlin@nokia.com X-Rspam-User: X-HE-Tag: 1649158576-737418 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: Hello Michal, thanks for the quick reply! On 05/04/2022 12:43, Michal Hocko wrote: >> 1. Crash of v5.4.170 on an ARM32 machine: >> >> Unable to handle kernel NULL pointer dereference at virtual address 00000104 >> pgd = e138149d >> [00000104] *pgd=84d2fd003, *pmd=8ffd6f003 >> Internal error: Oops: a07 [#1] PREEMPT SMP ARM >> ... >> CPU: 1 PID: 6172 Comm: AaSysInfoRColle Tainted: G B O 5.4.170-... #1 >> Hardware name: Keystone >> PC is at release_pages+0x194/0x358 >> LR is at release_pages+0x10c/0x358 > Which LOC does this correspond to? (faddr2line should give you a nice > output). Sorry, I forgot this info in the initial report: this is indeed the del_page_from_lru_list() in this crash. So it's either two different ->lru_lock or some other code path doesn't take lru_lock at all... -- Best regards, Alexander Sverdlin.