From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 13C163DB337 for ; Tue, 15 Sep 2026 03:04:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789441471; cv=none; b=QK6iyJsnJSm6ZoArzTj+aHMbrcvK5rHZtV6cPNI5s4kFh0QGePF0cGFGLAlvE9uoVN51sF4jAV9EfaByPoGcqvEzRJj6iVQ+c5mcDSSv1IZou87XvXfVt5D/xhc/qGZ1LOn622VYE15FasJqGQpRKTC9jiBC+m89O6b3+1afGf4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789441471; c=relaxed/simple; bh=PaYBfktKPCOVia+uHitZjiMQjJQW+XCs4nVFo6QmYxA=; h=Date:To:From:Subject:Message-Id; b=hWp7Mdp8SNEF1rWD8ojDjSzKA5WTCsstHjARlcTTusHjdlThwMJ/xYdrUkN5FHxgnMxQ6j3JWUd7XJ3Jc6gIKjq6+U0ghQZXnJSJy5cRlW/BP5KqtJz1mGI1gHJSGdL7gJytPG8SrCSMQh2Cg58hRqK8NF+Rc5VhCkHTwytA47U= 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=qh/jyLzI; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="qh/jyLzI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 804C91F000FF; Tue, 15 Sep 2026 03:04:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1789441469; bh=VSyWXslt08tFzgO1nrXRiYrE47xdiyNIdSOUjYhCjVQ=; h=Date:To:From:Subject; b=qh/jyLzIXplFyoV67aNBdQ6YUyAsiBeZ8P48civYXGX6zr+RQNadzTrks/qgRiSds 8dR8YMvqdDz3G+r2YnbtNcyrBoLu+c/68vChAmHomhF4aEO7C44r03oBwb+XCPAAn2 Eo1FlWTyppRM8NvDPgJjsu6uN81rzZGfjZQ/wb60= Date: Mon, 14 Sep 2026 20:04:29 -0700 To: mm-commits@vger.kernel.org,jaewook376@gmail.com,akpm@linux-foundation.org From: Andrew Morton Subject: [to-be-updated] mm-hugetlb-preserve-mremap-address-delta-when-skipping-page-tables.patch removed from -mm tree Message-Id: <20260915030429.804C91F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/hugetlb: preserve mremap address delta when skipping page tables has been removed from the -mm tree. Its filename was mm-hugetlb-preserve-mremap-address-delta-when-skipping-page-tables.patch This patch was dropped because an updated version will be issued ------------------------------------------------------ From: Jaewook You Subject: mm/hugetlb: preserve mremap address delta when skipping page tables Date: Sat, 12 Sep 2026 03:24:08 +0900 In move_hugetlb_page_tables(), optimize mremap() by advancing to the end of the page table when the source page table does not exist, either initially or after unsharing a PMD table. However, the code advances both the source and destination addresses to the end of their respective page tables, which is wrong. The destination address must be advanced only by the same amount as the source address. If the source and destination offsets within their page tables differ, the destination address can be advanced too far, causing follow-up issues. Fix this by advancing the destination address by the source advance distance. With a reproducer, we were able to trigger a kernel panic on x86-64. With this fix in place, we can no longer reproduce the issue. Link: https://lore.kernel.org/20260911182408.75821-1-jaewook376@gmail.com Fixes: e95a9851787b ("hugetlb: skip to end of PT page mapping when pte not present") Fixes: 4ddb4d91b82f ("hugetlb: do not update address in huge_pmd_unshare") Signed-off-by: Jaewook You Signed-off-by: Andrew Morton Assisted-by: LLM Cc: David Hildenbrand Cc: Johan Hovold Cc: Muchun Song Cc: Oscar Salvador Cc: --- mm/hugetlb.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) --- a/mm/hugetlb.c~mm-hugetlb-preserve-mremap-address-delta-when-skipping-page-tables +++ a/mm/hugetlb.c @@ -5226,18 +5226,21 @@ int move_hugetlb_page_tables(struct vm_a hugetlb_vma_lock_write(vma); i_mmap_lock_write(mapping); for (; old_addr < old_end; old_addr += sz, new_addr += sz) { + const unsigned long remaining_size = + (old_addr | last_addr_mask) - old_addr; + src_pte = hugetlb_walk(vma, old_addr, sz); if (!src_pte) { - old_addr |= last_addr_mask; - new_addr |= last_addr_mask; + old_addr += remaining_size; + new_addr += remaining_size; continue; } if (huge_pte_none(huge_ptep_get(mm, old_addr, src_pte))) continue; if (huge_pmd_unshare(&tlb, vma, old_addr, src_pte)) { - old_addr |= last_addr_mask; - new_addr |= last_addr_mask; + old_addr += remaining_size; + new_addr += remaining_size; continue; } _ Patches currently in -mm which might be from jaewook376@gmail.com are