From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DF02F1AD3F5 for ; Thu, 15 Aug 2024 15:35:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723736106; cv=none; b=JYaeRLot7FdW/Hv+IJLtCPVO184Ohi/Yet9EYE+CZVRmN0kY5oL4PvEiRo5HcPDrUVBxVKOoRtxoKu8VPVoYdNBQW/XKCCDZuDJNQA8PKMZWW89JRMtg4OncTa3Cscw+7DPfBxsYnfCxCGUjt2AjiwEl3dx9saweQ2OtEEt65mI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723736106; c=relaxed/simple; bh=DlgIgxiBhFo+jkPhNWroCaQoTF2NUFeY46QgxhB4eIo=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=PiEna+ng5yzDSujXMjnzu0L15Cb4FfDr7A6/g2YQ4+51a8+4wRLWilhzXZuZt0TbuBs5AFPR1h3wdHah2cd3zYBki7qwJ+Ih49eBxmWGbgJl1YtCUnopuz9xfMBqDygRxlfEpJs80P0aXxcosjcPJkWE2BmnLFwsFprWbHErnS4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=cuu5YhcL; arc=none smtp.client-ip=209.85.219.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="cuu5YhcL" Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-e02b5792baaso1539866276.2 for ; Thu, 15 Aug 2024 08:35:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1723736104; x=1724340904; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=a+itA/Bc7wc2NOvtIx4hiwBZycvBwEsvrVCKhgDY/aE=; b=cuu5YhcL39vJK1m6fp0YVlXIdoi1Dqs+LcCP4KTVu3LhRA1UPxqCnI/XNjM1o1QLPa mnZDA9QTH4T/0WPAPVQaVH8sCuDp/8bvEetFZEpFi5iV3HqSXGl1C7/fq49FUyzQ70lX SwGOt4WIRHQvmPPWvVIWufU61nqyKuZs7YUa1liH1bUSVdZ1ZSwA0TVdDViD+kAEv5Bx t4e706PSsAGnCfblFkA10m4OxI3CUuuwOemUW0NUa8LP0Lh3RTyhClmCi38FRprbPqeI LiYDjxVdA7RH2QXyvYiz6vxE+w0TDy5TUrOQnboPDAkoRMCA1dFbAfRXw6fvDKzmL2mG RwlA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1723736104; x=1724340904; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=a+itA/Bc7wc2NOvtIx4hiwBZycvBwEsvrVCKhgDY/aE=; b=DYu63JFRZQNXn3nGmk+TqfpD+uZO/6iltRi3+jxuwzSMsfL2jm0MEBxgyMkGWNwKdR iUATJQ63czyVfW95sGdl0uV3p2Xf6KnVef7A79PmNqmUgvaM33g0ZaFDl99uWEzNaR+O x8GVz6v6KdWBbBIKUSayjcFPQgrJFLnFCyiDFfY6AhtfainL0hLqoFSCHB2oJpclhIXF 3tJStI3uBr8TdiQvTfclhaeFK942EwnE+3x0mFIENklHbaouOXyiJl5818UNp6q4UFm8 Vsmw0bgXevnxMaiJuZRjeho7BVPeIoAheLFnsrXocyjhDui0BSJUVbEhdCs3OvSZ7SGf tE3w== X-Gm-Message-State: AOJu0YwuZVvyAx8jjva/cW5i1clNHTrKzGaVO+4r810KsBmZrQSAD8FY DPEHnaBLPCuSulsn7xRerEDPBRq+0DekctX/u6OQwwJg4HF1xs9zQG9U7Jqab4CJt1K9Kz7u7I7 hTw== X-Google-Smtp-Source: AGHT+IGhR1zH4j6I9fAAa31KTuPNhDg/X4A7emGYjLgG9jRUqpbUY6N3z5f2ToBOisNvkawZeUggGOyAZRI= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a25:9b09:0:b0:e0e:87f7:f6d3 with SMTP id 3f1490d57ef6-e1180fb1623mr90276.11.1723736103780; Thu, 15 Aug 2024 08:35:03 -0700 (PDT) Date: Thu, 15 Aug 2024 08:35:02 -0700 In-Reply-To: Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: Message-ID: Subject: Re: [Bug 219161] New: VM with virtio-net doesn't receive large UDP packets (e.g 65507 bytes) from host From: Sean Christopherson To: bugzilla-daemon@kernel.org Cc: kvm@vger.kernel.org Content-Type: text/plain; charset="us-ascii" On Thu, Aug 15, 2024, bugzilla-daemon@kernel.org wrote: > Large UDP packets (e.g 65507 bytes) are not received in VM using virtio-net > when sent from host to VM, while smaller packets are received successfully. > > The issue occurs with or without vhost enabled, and can be reproduce with > 6.5.0-rc5+ Is this 100% reproducible? And did it first show up in 6.5-rc5, i.e. does everything work as expected in 6.5-rc4? If so, bisecting will likely get you a fast root cause and fix, unless someone happens to know a likely suspect.