From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DF5822874E9 for ; Sat, 22 Nov 2025 21:41:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763847703; cv=none; b=PaeYLLCCDyD1HHrPBr4725/wiQcrVnvhCf+wjpRqkyu821sc74xvXdQI3DEUE7EKsLMNbspx553laNPqGBX12tkgVIkm1NbJe5/Gfz+b/y41BLM1HfgqteVf8nPeGq0S+E1R3s1qdTNDAec4cN49s+L9DBqa7jZGHAIdRxwmjaU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763847703; c=relaxed/simple; bh=Aw3sgdJorseTg5hkOJ6KHvqdHDywqyQ5j+8wxkTMc3c=; h=Date:To:From:Subject:Message-Id; b=cuNdkq919MGPA0pO5pfnn5B2AXFCyn2trElRAaivpvBP7kCxROsAyB9GfZTV/5XLNesR9Fv42VwDssqSKH8TzZlb6PVj/Hz/tDDRlO14jJ5Ye2fF4UKEiWg0J0l0ZvIYDg6xjYrc9C/u5EguK17JrmuPqL2mJb9utuEXiykE40o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=WTgJUSL/; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="WTgJUSL/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 487DAC4CEF5; Sat, 22 Nov 2025 21:41:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1763847702; bh=Aw3sgdJorseTg5hkOJ6KHvqdHDywqyQ5j+8wxkTMc3c=; h=Date:To:From:Subject:From; b=WTgJUSL/qCdl3s8XMkEfesItDDkO4Y+fOgvxeyqMDUS0MrQ1PV/0yO16oNqZZ0Cg8 XqqHKPOm6awjqcVY2z+Ne+xXU5ahUWN2IaU76QxZ70hhbOI3J9LjWgXA/a9dM+5qo/ 5qpQarxMmdo++gCUcSr0pmh+85ouk74QLI8RW5u8= Date: Sat, 22 Nov 2025 13:41:41 -0800 To: mm-commits@vger.kernel.org,rppt@kernel.org,pratyush@kernel.org,pasha.tatashin@soleen.com,graf@amazon.com,changyuanl@google.com,catalin.marinas@arm.com,ran.xiaokai@zte.com.cn,akpm@linux-foundation.org From: Andrew Morton Subject: + kho-fix-boot-failure-due-to-kmemleak-access-to-non-present-pages.patch added to mm-nonmm-unstable branch Message-Id: <20251122214142.487DAC4CEF5@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: KHO: fix boot failure due to kmemleak access to non-PRESENT pages has been added to the -mm mm-nonmm-unstable branch. Its filename is kho-fix-boot-failure-due-to-kmemleak-access-to-non-present-pages.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kho-fix-boot-failure-due-to-kmemleak-access-to-non-present-pages.patch This patch will later appear in the mm-nonmm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Ran Xiaokai Subject: KHO: fix boot failure due to kmemleak access to non-PRESENT pages Date: Sat, 22 Nov 2025 18:29:29 +0000 When booting with debug_pagealloc=on while having: CONFIG_KEXEC_HANDOVER_ENABLE_DEFAULT=y CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF=n the system fails to boot due to page faults during kmemleak scanning. This occurs because: With debug_pagealloc is enabled, __free_pages() invokes debug_pagealloc_unmap_pages(), clearing the _PAGE_PRESENT bit for freed pages in the kernel page table. Commit 3dc92c311498 ("kexec: add Kexec HandOver (KHO) generation helpers") triggers this when releases the KHO scratch region calling init_cma_reserved_pageblock(). Subsequent kmemleak scanning accesses these non-PRESENT pages, leading to fatal page faults. Call kmemleak_ignore_phys() from kho_init() to exclude the reserved region from kmemleak scanning before it is released to the buddy allocator to fix this. Link: https://lkml.kernel.org/r/20251122182929.92634-1-ranxiaokai627@163.com Signed-off-by: Ran Xiaokai Cc: Alexander Graf Cc: Catalin Marinas Cc: Changyuan Lyu Cc: Mike Rapoport Cc: Pasha Tatashin Cc: Pratyush Yadav Signed-off-by: Andrew Morton --- kernel/liveupdate/kexec_handover.c | 2 ++ 1 file changed, 2 insertions(+) --- a/kernel/liveupdate/kexec_handover.c~kho-fix-boot-failure-due-to-kmemleak-access-to-non-present-pages +++ a/kernel/liveupdate/kexec_handover.c @@ -11,6 +11,7 @@ #include #include +#include #include #include #include @@ -1369,6 +1370,7 @@ static __init int kho_init(void) unsigned long count = kho_scratch[i].size >> PAGE_SHIFT; unsigned long pfn; + kmemleak_ignore_phys(kho_scratch[i].addr); for (pfn = base_pfn; pfn < base_pfn + count; pfn += pageblock_nr_pages) init_cma_reserved_pageblock(pfn_to_page(pfn)); _ Patches currently in -mm which might be from ran.xiaokai@zte.com.cn are kho-fix-boot-failure-due-to-kmemleak-access-to-non-present-pages.patch