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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/