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 72BB7128816 for ; Wed, 4 Feb 2026 00:26:57 +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=1770164817; cv=none; b=Kn+ciYweyU253qVCYs+yo+khRJm25bXoZ0Hk+WCMGedSf9W/wCipnnJzvHgeh73Tu+HA5GDprfZ+ia6fWb3iTN3twWVfuAZj8mBlvhs5dNgQv3RG+GkrfIaCgkuh6P2QBAFH19ci1tqH+Jx1lWFR/2EzE8FhMatlS4GK7myvm58= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770164817; c=relaxed/simple; bh=ZaNh73bMrH03v3eiBU4NbNgedfqZllF6g41hr77c8n8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=C+mZlPWulomKuSHNld15ltZHSUdqtPsmLRYMlE9xcsP3IYvICaZ380ps9zqO+8vq/qIs3Khnirypg/pq7zMhoHXeg1CqbXmPDylMMK8mC/cNS/xqYgGjHHaugy2XarNfEQoSE/6iT9HKOASktEkABA7TkWCjLOVeDMdyiLUSeDg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=d3apMHEH; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="d3apMHEH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 040BBC116D0; Wed, 4 Feb 2026 00:26:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770164817; bh=ZaNh73bMrH03v3eiBU4NbNgedfqZllF6g41hr77c8n8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d3apMHEH1F2PY6tkCT6ZsmrPG7OTHcpyeXeBqjbWDds82bWhjmu6PAHF3mlxmp4Lm mVoIam84aOkFFEmeWrzF99/DBhDmZT4pq/kXYtZmr/GAVOZ2BLQXci96Uj73M+KRRr mnBRghK4kZFCcMaLK9jJJRqlQiAljg1tsQZhSYx2saBcCvqORb5EnA4QXszYnLKgsB GgCokPK9P1UMwnDAp5IdjjR9YcA+HSZgw2fFEtCGZ9cC1ComgaR2nlTrt0Ml4/osFc /ByPehIBth8v4jzgCuyfY96yJp3V50NwQGPpBSrj9swxaGJB5tgiiOsSTV9mw/N+gH xuLY1eRUDVkjg== From: Sasha Levin To: stable@vger.kernel.org Cc: Ran Xiaokai , Pratyush Yadav , Pasha Tatashin , "Mike Rapoport (Microsoft)" , Alexander Graf , Kent Overstreet , Suren Baghdasaryan , Andrew Morton , Sasha Levin Subject: [PATCH 6.18.y] kho: init alloc tags when restoring pages from reserved memory Date: Tue, 3 Feb 2026 19:26:54 -0500 Message-ID: <20260204002654.1462558-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <2026020303-drippy-appliance-a74c@gregkh> References: <2026020303-drippy-appliance-a74c@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Ran Xiaokai [ Upstream commit e86436ad0ad2a9aaf88802d69b68f02cbd1f04a9 ] Memblock pages (including reserved memory) should have their allocation tags initialized to CODETAG_EMPTY via clear_page_tag_ref() before being released to the page allocator. When kho restores pages through kho_restore_page(), missing this call causes mismatched allocation/deallocation tracking and below warning message: alloc_tag was not set WARNING: include/linux/alloc_tag.h:164 at ___free_pages+0xb8/0x260, CPU#1: swapper/0/1 RIP: 0010:___free_pages+0xb8/0x260 kho_restore_vmalloc+0x187/0x2e0 kho_test_init+0x3c4/0xa30 do_one_initcall+0x62/0x2b0 kernel_init_freeable+0x25b/0x480 kernel_init+0x1a/0x1c0 ret_from_fork+0x2d1/0x360 Add missing clear_page_tag_ref() annotation in kho_restore_page() to fix this. Link: https://lkml.kernel.org/r/20260122132740.176468-1-ranxiaokai627@163.com Fixes: fc33e4b44b27 ("kexec: enable KHO support for memory preservation") Signed-off-by: Ran Xiaokai Reviewed-by: Pratyush Yadav Reviewed-by: Pasha Tatashin Reviewed-by: Mike Rapoport (Microsoft) Cc: Alexander Graf Cc: Kent Overstreet Cc: Suren Baghdasaryan Cc: Signed-off-by: Andrew Morton Signed-off-by: Sasha Levin --- kernel/kexec_handover.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/kernel/kexec_handover.c b/kernel/kexec_handover.c index 03d12e27189fc..db08c1a2e1f80 100644 --- a/kernel/kexec_handover.c +++ b/kernel/kexec_handover.c @@ -260,6 +260,14 @@ static struct page *kho_restore_page(phys_addr_t phys) if (info.order > 0) prep_compound_page(page, info.order); + /* Always mark headpage's codetag as empty to avoid accounting mismatch */ + clear_page_tag_ref(page); + if (!is_folio) { + /* Also do that for the non-compound tail pages */ + for (unsigned int i = 1; i < nr_pages; i++) + clear_page_tag_ref(page + i); + } + adjust_managed_page_count(page, nr_pages); return page; } -- 2.51.0