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 BD57B2FF641; Tue, 18 Aug 2026 17:21:04 +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=1787073665; cv=none; b=mUFTzc7OaFdBCjkfp/lAKdX2P8PM7TjJmh8QSdEwYJ7tc1sTGldDBpM0dpRHwBUNfbxl577q3BwvG/Fb3tmXS6YS+JA99laBO09d10MXGTbMi05a9mk9BPoiUwq3QztXK0sWHzdot3mXfQ2vEU3aS3tfqbU01N3hZu9b93z/1gw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787073665; c=relaxed/simple; bh=gI7UhZ1exmvD/QIMKgqX6w1TdP0/7sGc9Q0Ny9Vc9Zc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=cxd69cl4siHrmMsRDK0d4v8t7f5I5m9Oma8t5DttiZJxfwpRbrB7fGvzawUJLArj6YE+6QuMPey1ZLsVZW7IlDFcdErUd2kwrKns3zv9+cYBp+Vg3ZT2NM9G/BesIROxSl5oFFDHeNUBrPEscOMIGVwfALeGONc67lQtoqlmRfY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Iqnz9UMl; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Iqnz9UMl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 287EE1F000E9; Tue, 18 Aug 2026 17:20:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787073664; bh=usamnhvWOycZ6oPtfGQuy9B/PR/s1qj690CQK8wra7o=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=Iqnz9UMlga0okF1l0c78suFZFQqYyb/ObiOdyh+5jt9rAwZC0OV+2JSpzQFp4Dm8d tNPT/9KgLPaoglwZUx3ptPjCPh3TtIYbdrb/EHKwrp/rOCW3Ltp3fWWNzXVoUsgX1Q zqrawh25u4vR/w28ZPvRyBvjYsbon7qmiWdxfTxQoPcByhyrVh76yfPPCjTH6hkHMV uxJZEv46cyMr1O34mR4cyBWx6L96nNfAbGujhe+6Jr5ojCFODvgSkDaVPXpRmDB7rB 43dbF/Z/RDsCrFz9cDuxdUT/Q79YIc5xkssqVBHTrmtMDzooAvR6G+nKc1lu6zZ7qZ xsrzNfIOjOMZw== Message-ID: <397f60ab-4a3d-438f-a7db-4c598af13f1c@kernel.org> Date: Tue, 18 Aug 2026 19:20:58 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm, swap: ratelimit bad swap entry reports To: Breno Leitao , Andrew Morton , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Barry Song , Youngjun Park , Miaohe Lin , Oscar Salvador Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, stable@vger.kernel.org References: <20260818-swap_part_one-v1-1-a4fc58119fc0@debian.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 8/18/26 11:03, Breno Leitao wrote: > 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. > > Cc: stable@vger.kernel.org > Fixes: 23b230ba8ac3 ("mm/swap: print bad swap offset entry in get_swap_device") > Reviewed-by: Barry Song > Reviewed-by: Nhat Pham > Acked-by: Kairui Song > Signed-off-by: Breno Leitao > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David