From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6B90AC77B7E for ; Sat, 27 May 2023 09:33:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231922AbjE0Jd4 (ORCPT ); Sat, 27 May 2023 05:33:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35706 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229684AbjE0Jdy (ORCPT ); Sat, 27 May 2023 05:33:54 -0400 Received: from wout1-smtp.messagingengine.com (wout1-smtp.messagingengine.com [64.147.123.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BD3F2DE; Sat, 27 May 2023 02:33:52 -0700 (PDT) Received: from compute6.internal (compute6.nyi.internal [10.202.2.47]) by mailout.west.internal (Postfix) with ESMTP id 624303200952; Sat, 27 May 2023 05:33:49 -0400 (EDT) Received: from imap51 ([10.202.2.101]) by compute6.internal (MEProxy); Sat, 27 May 2023 05:33:50 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arndb.de; h=cc :cc:content-type:content-type:date:date:from:from:in-reply-to :in-reply-to:message-id:mime-version:references:reply-to:sender :subject:subject:to:to; s=fm3; t=1685180028; x=1685266428; bh=K5 HSzSXgcT98s5lBDkCfWoTpmYhsHpXg6HrwUgDT17w=; b=TT7EEIyxeFeWNuLBVT yW32yXFDncBwoZWU3EymCA/AKmOIkj6LUWqmYTVPTxUMXf1232uP7Pj5iX/i4feg sBTIvlP8tvmGHyVo/LupLQ49LSIFr7HlWHBuVXZQ7tR8ib4ACs5+rNfB243xeN0z FwHF8XnOmvCBEH1osHTEzQGY4Ep5dCvIdkW3Vir3CzUaNcAQN5YDWF0K6eM9WRK1 34tArmyNIlH2DCuPp3502I+N+BjxCMU4287xLVME5LtLDWc2uEJ+orKv/w0rm2yC 54GoVGOa+Zo8pxKKT15z+LCAHcQJUtupPPz4l5MPj1ygmp5KrjemJDFUkWdlzM+B Saig== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-type:content-type:date:date :feedback-id:feedback-id:from:from:in-reply-to:in-reply-to :message-id:mime-version:references:reply-to:sender:subject :subject:to:to:x-me-proxy:x-me-proxy:x-me-sender:x-me-sender :x-sasl-enc; s=fm1; t=1685180028; x=1685266428; bh=K5HSzSXgcT98s 5lBDkCfWoTpmYhsHpXg6HrwUgDT17w=; b=rM1q1rcBDxeTqZMmlqXVSXMgkPcbr ZodW4gGD/nDBS6ste/jBse17h1XICdAud9JmPW8nDWTXO9MN/0iJrfTXKBfDbDIB XlCw40q8nLV9D112QCDsRdRMiBioszqlClt23GM77kVuPnsMAm+72+YBeU85/s7l QeauHWThHvgphCWpeXxX5XoitJ5vrnf9O0oWA1+o7e5Q7t755H0KkD0YhVq3gwuh FpzI77DogSNSnDMtyT9pBEgOJQJ1MCh5eDz9theV20t+oIrQnsZoxiuyXRXXKiXM TKrREGAJkvom4lxH6dmkyIsj8jIiDMII6+X+6sNbH8r9xbj0wctiNfltQ== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvhedrfeekuddgudejucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhepofgfggfkjghffffhvfevufgtsehttdertderredtnecuhfhrohhmpedftehr nhguuceuvghrghhmrghnnhdfuceorghrnhgusegrrhhnuggsrdguvgeqnecuggftrfgrth htvghrnhepffehueegteeihfegtefhjefgtdeugfegjeelheejueethfefgeeghfektdek teffnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomheprg hrnhgusegrrhhnuggsrdguvg X-ME-Proxy: Feedback-ID: i56a14606:Fastmail Received: by mailuser.nyi.internal (Postfix, from userid 501) id 941FBB60089; Sat, 27 May 2023 05:33:48 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.9.0-alpha0-441-ga3ab13cd6d-fm-20230517.001-ga3ab13cd Mime-Version: 1.0 Message-Id: In-Reply-To: <20230527034922.5542-1-kuniyu@amazon.com> References: <20230526201607.54655398@kernel.org> <20230527034922.5542-1-kuniyu@amazon.com> Date: Sat, 27 May 2023 11:33:28 +0200 From: "Arnd Bergmann" To: "Kuniyuki Iwashima" , "Naresh Kamboju" Cc: "Jakub Kicinski" , "Anders Roxell" , "Dan Carpenter" , "David S . Miller" , linux-kernel@vger.kernel.org, lkft-triage@lists.linaro.org, "Xin Long" , "Martin KaFai Lau" , Netdev , stable@vger.kernel.org, willemdebruijn.kernel@gmail.com Subject: Re: selftests: net: udpgso_bench.sh: RIP: 0010:lookup_reuseport Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, May 27, 2023, at 05:49, Kuniyuki Iwashima wrote: > From: Jakub Kicinski > Date: Fri, 26 May 2023 20:16:07 -0700 >> On Wed, 24 May 2023 13:24:15 +0530 Naresh Kamboju wrote: >> > While running selftests: net: udpgso_bench.sh on qemu-x86_64 the following >> > kernel crash noticed on stable rc 6.3.4-rc2 kernel. >> >> Can you repro this or it's just a one-off? >> >> Adding some experts to CC. > > FWIW, I couldn't reproduce it on my x86_64 QEMU setup & 6.4.0-rc3 > at least 5 times, so maybe one-off ? This looks like one of several spurious reports that lkft has produced recently, where an 'int3' trap instruction is executed in a function that is live-patched, but at a point where the int3 is not expected. Anders managed to get a reproducer for one of these on his manchine yesterday, and has narrowed it down to failing on qemu-7.2.2 but not failing on qemu-8.0. The current theory right now is that this is a qemu bug when dealing with self-modifying x86 code that has been fixed in qemu-8.0 already, and my suggestion would be to ignore all bugs found by lkft that involve an 'int3' trap, and instead change the lkft setup to use either qemu-8.0 or run the test systems in kvm (which would also be much faster and save resources). Someone still needs to get to the bottom of this bug to see if it's in qemu or in the kernel livepatching code, but I'm sure it has nothing to do with the ipv6 stack. Arnd