From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp-fw-80006.amazon.com (smtp-fw-80006.amazon.com [99.78.197.217]) (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 8C5FB15A5; Wed, 21 Feb 2024 05:42:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=99.78.197.217 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708494130; cv=none; b=XI8jd8jq+dBwzKcHj+X2gLUFgIFxwmQadpPMTAoZgZW3PE+7t/pwKNxnY33oU9Q0UCR9o7V1dC/fBCcGmKwQdEdAcmmxjlXB9Q3DdruP+EloFnu96lGf8rWqvcSPmIAuXkhdpYat4R2ZjQYXPFm7fQUvOqi3poW7CmuHbqo5uyE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708494130; c=relaxed/simple; bh=cGaSLMlLu7obgGVEplEAZ5ydNe3Gim/TosgoGlQ22y8=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=b9NZ3SmUPGc9kVlo7ptEBUctfG32WGlU/RdhxlE56eXDvjeLY82EnofgTmaroam1S/PkcycuWAUFOy8mWv/4+4OV8+5lPWKIEClx44sNZ3/a/xNAwuEmpWWuvdcAmYKUKRqu8IS0q2e2eCZ9IJRc/mavKszrgH3Lvz3iNaeE8zo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com; spf=pass smtp.mailfrom=amazon.co.jp; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b=AU8WSuWs; arc=none smtp.client-ip=99.78.197.217 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=amazon.co.jp Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="AU8WSuWs" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1708494129; x=1740030129; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=nCb56l2vj0YcNG57jkT1YQ6JqSPECiwfE7fb1NQs81g=; b=AU8WSuWsi/NRLuor6onCW2LI1c8Bi+CQfI4a+RfGr+33gCHgiP5sqcsr EmQxuqf0W554ey/fQzHg6zLUQi44I9oUG4uEtFpXHBhrn+hXxCu9G+lDe MthdiQZkH0HTvsSkaHlhzwCTQacgbe+1gGEboD7xRo//DdkKGnDhHXP9B o=; X-IronPort-AV: E=Sophos;i="6.06,174,1705363200"; d="scan'208";a="274736649" Received: from pdx4-co-svc-p1-lb2-vlan3.amazon.com (HELO smtpout.prod.us-west-2.prod.farcaster.email.amazon.dev) ([10.25.36.214]) by smtp-border-fw-80006.pdx80.corp.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Feb 2024 05:42:07 +0000 Received: from EX19MTAUWC002.ant.amazon.com [10.0.7.35:29998] by smtpin.naws.us-west-2.prod.farcaster.email.amazon.dev [10.0.63.151:2525] with esmtp (Farcaster) id 1cf9b7cc-9ac7-4cda-a4e5-9730db8a2576; Wed, 21 Feb 2024 05:42:06 +0000 (UTC) X-Farcaster-Flow-ID: 1cf9b7cc-9ac7-4cda-a4e5-9730db8a2576 Received: from EX19D004ANA001.ant.amazon.com (10.37.240.138) by EX19MTAUWC002.ant.amazon.com (10.250.64.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Wed, 21 Feb 2024 05:42:05 +0000 Received: from 88665a182662.ant.amazon.com.com (10.119.137.44) by EX19D004ANA001.ant.amazon.com (10.37.240.138) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1118.40; Wed, 21 Feb 2024 05:42:03 +0000 From: Kuniyuki Iwashima To: CC: , , , , , , , , Subject: Re: [Syzkaller & bisect] There is BUG: soft lockup after sendmsg syscall in v6.8-rc4 Date: Tue, 20 Feb 2024 21:41:54 -0800 Message-ID: <20240221054154.51749-1-kuniyu@amazon.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: EX19D035UWA003.ant.amazon.com (10.13.139.86) To EX19D004ANA001.ant.amazon.com (10.37.240.138) From: Pengfei Xu Date: Wed, 21 Feb 2024 10:30:05 +0800 > Hi Kuniyuki Iwashima and kernel experts, > > Greeting! > There is BUG: soft lockup after sendmsg syscall in v6.8-rc4 in guest. > > All detailed info: https://github.com/xupengfe/syzkaller_logs/tree/main/240220_161242_softlockup > Syzkaller reproduced code: https://github.com/xupengfe/syzkaller_logs/blob/main/240220_161242_softlockup/repro.c > Syzkaller syscall reproduced steps: https://github.com/xupengfe/syzkaller_logs/blob/main/240220_161242_softlockup/repro.prog > Kconfig(need make olddefconfig): https://github.com/xupengfe/syzkaller_logs/blob/main/240220_161242_softlockup/kconfig_origin > Bisect info: https://github.com/xupengfe/syzkaller_logs/blob/main/240220_161242_softlockup/bisect_info.log > v6.8-rc4 issue dmesg: https://github.com/xupengfe/syzkaller_logs/blob/main/240220_161242_softlockup/841c35169323cd833294798e58b9bf63fa4fa1de_dmesg.log > bzImage_v6.8-rc4: https://github.com/xupengfe/syzkaller_logs/raw/main/240220_161242_softlockup/bzImage_v6.8-rc4.tar.gz > > Bisected and found first bad commit: > " > 1279f9d9dec2 af_unix: Call kfree_skb() for dead unix_(sk)->oob_skb in GC. > " Thanks for the report. I think syzbot reported the same issue. https://syzkaller.appspot.com/bug?extid=ecab4d36f920c3574bf9 Could you try this patch ? https://lore.kernel.org/netdev/20240219174657.6047-1-kuniyu@amazon.com/