From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from stravinsky.debian.org (stravinsky.debian.org [82.195.75.108]) (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 B944941B8DC for ; Mon, 10 Aug 2026 16:28:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=82.195.75.108 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786379289; cv=none; b=T/HmNBfiCMMyiL8EXyxRj+YzRbqDAVQWpWkryZIXxod3WC5r5YTTzVR2eDgdh6Z6RJHzPyMcs3gDgWj/IO4/37uBQOXZivkCNX2m6v+kxiKILp2LQtRoY8tg/7EbVyH7I5JDev9Ms5fOWjPzTrzBLMzQ3DzYRhumlDPPiRy4Wew= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786379289; c=relaxed/simple; bh=xkXi9fgJ7KrcCeZFprZs/+gSFahKcbk7Esh+oPKGx4o=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=AZGzxSCSSP7OxbKASdcyrKTg0jjbrRNNFCvC3KYcLNlTlV3V71DZVeVHV7Rx/Ghn9wtsb5HCHSyTkBeypwMpEeU0mGglxRd/c1WgGtd90BFf0Y2ONWs8n5mg2SVAs6IHTeKbcFwoODPCgonJ864W7ls4kFxlSTDen47j7xLOeHE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=debian.org; spf=pass smtp.mailfrom=debian.org; dkim=pass (2048-bit key) header.d=debian.org header.i=@debian.org header.b=tL1zRUNp; arc=none smtp.client-ip=82.195.75.108 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=debian.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=debian.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=debian.org header.i=@debian.org header.b="tL1zRUNp" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=debian.org; s=smtpauto.stravinsky; h=X-Debian-User:Cc:To:In-Reply-To:References: Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description; bh=X260Hjv1Vm1+CEj2cIe0a1PWTJRFadqLD8eHwG/NZfU=; b=tL1zRUNpp3afizNL+2uKCvqgav br5f6vl8elgVUmpe6csLrT3hZ6en1h2jFwx9kl2TnVmGsDlWqcHLo9thWg5oR1WHeXZadQgQtAi7O 1uC5a+GzzutAlpQi1IErIbficuV9v4nKDuDV6kG1vunLmUQ+ID4zxfCsvfLg+jkua5feS4plS/F31 q6bEthbhCK99TuKavmLGjTwMhc6BRvLgh/if25ocv0wsluJpKSCz+EKvQkRk+LN80O+DWqEqCJaQU gE22eN7KsD5pnOAlOlEYBlMaMcpIog0eP0+RlH0OE41G7B2TII9Stmw4iNpaX+EG4yRF2l48RwjRm EyYxAGKA==; Received: from authenticated-user by stravinsky.debian.org with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.96) (envelope-from ) id 1wtSqg-002ufA-1m; Mon, 10 Aug 2026 16:27:39 +0000 From: Breno Leitao Date: Mon, 10 Aug 2026 09:26:49 -0700 Subject: [PATCH 1/3] mm, swap: ratelimit bad swap entry reports in get_swap_device() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260810-swap-v1-1-375ef0767206@debian.org> References: <20260810-swap-v1-0-375ef0767206@debian.org> In-Reply-To: <20260810-swap-v1-0-375ef0767206@debian.org> To: Andrew Morton , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Barry Song , Youngjun Park , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jann Horn , Pedro Falcato , Hugh Dickins , Baolin Wang , Peter Xu , Johannes Weiner , Yosry Ahmed , Chengming Zhou Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, Breno Leitao X-Mailer: b4 0.16-dev-f8e9d X-Developer-Signature: v=1; a=openpgp-sha256; l=976; i=leitao@debian.org; h=from:subject:message-id; bh=xkXi9fgJ7KrcCeZFprZs/+gSFahKcbk7Esh+oPKGx4o=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBqefvpln63mQ6+J5NEbzNRv+b2ue7YHSg/NdBrc ElVPwjOUWqJAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCann76QAKCRA1o5Of/Hh3 bYaTEACOQAJ6NERN3M8O1i9zp/4Q3IVATkjnbEjHEtTQBrzn7eMbezJsCH+ViJmjDytGWrbddMU jsB4bupJbIV2TeXU3k1cKkVFXVdlwVc8Htn4WVKMI++tbPtif390U6S9bJTkO3b6yYGkixpxHkK AqYG5nTKaZnXj6yg5iKow670eLywodVVwWr1TRz6Z/WP7ph/yE0wzuu+POvx4eHkngNy2M8EZBP aNDjQg3S+JY5BaY8VMfO9t5yHfleT2+ElNHx+4U0Pn872VxZCCZIwd2ygZXQYzVVJ6xSNvTxGU5 O5eWjBE6SUmpVFxJtV4y02vbVAWPQfj0C5pboZcb4/nOhUrT9Q08czl8mVypCJto7Mqv0Bw6bb6 /5FBDlXf3C5fy2DEfzBBfTZ8q7Jsv4Jy/yQXKdqzoE30ox6Na674oKSsG43HiG/j/qOJJ4UatVn VY9aXRdDcXkkzeFxBunYw+XiBZzKsKx2zIKzSNMnvKGjauWwAWig4MUID3zjNrTXNaiFe3LogMB c8XR7gfoC5cb+yl2k7aUmW0WV3bzGWrgwsNKyYYgf0CwSQ8UVRXc0U4H1oc4/SuroYqf0OP4kQO mK+9LVPkubcYQHhXWvUXs7Uh6TtQwLSM2RD3e4JqKfA/CWc2bH5+AuZ+tWnBHhRXDOlIrHFqFJP 2IDb/9QEHNO80eg== X-Developer-Key: i=leitao@debian.org; a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D X-Debian-User: leitao 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. Rate limit both prints. Signed-off-by: Breno Leitao --- mm/swapfile.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index 4d4e3e3059f6b..9ab11dc24e4f1 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1899,11 +1899,11 @@ struct swap_info_struct *get_swap_device(swp_entry_t entry) 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; } -- 2.53.0-Meta