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 E8A40358389; Tue, 18 Aug 2026 19:29:11 +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=1787081355; cv=none; b=bNoBCXSL39QX5pmTtghUETvyvK9zrOyzo/41bWDpavqGUDJ0hqZAGnjOYJc9XH1hXXBvdUpkDvq5ya7O6zHCNoGMqrqdhbc5tNbE62JeeXXREIMOykL7jIHNOI/7Lcbm2+aXKOMr1YA5irqtIo0oo8dNq3JeNbSHLgYVflqzyFI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787081355; c=relaxed/simple; bh=ECSi2dqL6Y7BW1VnpS2gzJXXwMRc+rzHk3d6ewIB+Nk=; h=Date:To:From:Subject:Message-Id; b=lwztBSmPT8xZy4se9JZYBOyv7s/xdWxVSng6TQJFvBfPuwRCoPmFDVDSKu2h91MWhwuSNL0Rw9t9jgr5cm4kFMDTDHg3UhVg2Q7JfrUXU+fIMGj3YtPMe/s/YCcYO/pxzTypPBlzRYoKn1hom3gMTu8cDnl0mD64Fo40DAeV7Yw= 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=xPReECoD; 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="xPReECoD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8E1901F00A3D; Tue, 18 Aug 2026 19:29:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1787081351; bh=EvDpBrFMwYkKtd2F1s98/J8aUzlp/dxkidKmfLTZD4Q=; h=Date:To:From:Subject; b=xPReECoDJ39IFGDs05WBFZe/SonP9QvHfeYnVswgi4m0gpSDe2DaWpnuAeRMd408L BFb+/eDUPsVB6ffJ8qwQR7Is8SAHWtoJaD28ycvr2iJE1IYxdkNBHwfHYXm/Hk/W1m E4RKcY31EUK119sZu/V8u7ESJ7wml+SOdtNqlH/k= Date: Tue, 18 Aug 2026 12:29:11 -0700 To: mm-commits@vger.kernel.org,stable@vger.kernel.org,shikemeng@huaweicloud.com,osalvador@suse.de,nphamcs@gmail.com,linmiaohe@huawei.com,kasong@tencent.com,david@kernel.org,chrisl@kernel.org,baoquan.he@linux.dev,baohua@kernel.org,leitao@debian.org,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-swap-ratelimit-bad-swap-entry-reports.patch added to mm-unstable branch Message-Id: <20260818192911.8E1901F00A3D@smtp.kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm, swap: ratelimit bad swap entry reports has been added to the -mm mm-unstable branch. Its filename is mm-swap-ratelimit-bad-swap-entry-reports.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-swap-ratelimit-bad-swap-entry-reports.patch This patch will later appear in the mm-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 various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Breno Leitao Subject: mm, swap: ratelimit bad swap entry reports Date: Tue, 18 Aug 2026 02:03:40 -0700 A corrupt page table hands the same bogus entry to get_swap_device() on every access to the mapping, and every rejection is logged. One machine logged 6185620 copies of the same line in a few hours. swap_dup_entry_direct() prints the same message from the fork path, once per call: the WARN_ON_ONCE() guarding it warns once, the pr_err() inside does not. Rate limit all three prints. Link: https://lore.kernel.org/20260818-swap_part_one-v1-1-a4fc58119fc0@debian.org Fixes: 23b230ba8ac3 ("mm/swap: print bad swap offset entry in get_swap_device") Signed-off-by: Breno Leitao Reviewed-by: Barry Song Reviewed-by: Nhat Pham Acked-by: Kairui Song Acked-by: David Hildenbrand (Arm) Cc: Baoquan He Cc: Chris Li Cc: Kemeng Shi Cc: Miaohe Lin Cc: Oscar Salvador Cc: Signed-off-by: Andrew Morton --- mm/swapfile.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/mm/swapfile.c~mm-swap-ratelimit-bad-swap-entry-reports +++ a/mm/swapfile.c @@ -1899,11 +1899,11 @@ struct swap_info_struct *get_swap_device return si; bad_nofile: - pr_err("%s: %s%08lx\n", __func__, Bad_file, entry.val); + pr_err_ratelimited("%s: %s%08lx\n", __func__, Bad_file, entry.val); out: return NULL; put_out: - pr_err("%s: %s%08lx\n", __func__, Bad_offset, entry.val); + pr_err_ratelimited("%s: %s%08lx\n", __func__, Bad_offset, entry.val); percpu_ref_put(&si->users); return NULL; } @@ -3883,7 +3883,7 @@ int swap_dup_entry_direct(swp_entry_t en si = swap_entry_to_info(entry); if (WARN_ON_ONCE(!si)) { - pr_err("%s%08lx\n", Bad_file, entry.val); + pr_err_ratelimited("%s%08lx\n", Bad_file, entry.val); return -EINVAL; } _ Patches currently in -mm which might be from leitao@debian.org are mm-kmemleak-report-rcu-tasks-quiescent-states-during-the-scan.patch mm-kmemleak-report-leaks-only-after-n-consecutive-unreferenced-scans.patch mm-kmemleak-factor-leak-confirmation-into-a-helper.patch selftests-mm-test-kmemleaks-n-consecutive-scan-leak-confirmation.patch mm-kmemleak-default-min_unref_scans-to-2-for-verbose-auto-scan.patch documentation-kmemleak-document-the-conditional-min_unref_scans-default.patch selftests-mm-kmemleak-drop-stale-min_unref_scans-default-from-comments.patch mm-swap-ratelimit-bad-swap-entry-reports.patch