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Wed, 9 Jul 2025 14:54:03 +0000 (GMT) Message-ID: <472a5d43-4905-4fa4-8750-733bb848410d@linux.ibm.com> Date: Wed, 9 Jul 2025 09:54:03 -0500 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US From: Konstantin Shkolnyy Subject: RE: [PATCH net-next v4] vsock/test: Add test for null ptr deref when transport changes To: mhal@rbox.co, sgarzare@redhat.com Cc: virtualization@lists.linux.dev, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, v4bel@theori.io, leonardi@redhat.com Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzA5MDEzMyBTYWx0ZWRfX53N/PUiiBrFU MaQgG2KYArLUO/pTwJVwCcpcxwFX40XiQkl5qcyc54T1nPARhzyQlL6XPtMOdF9BC2NY7iXJWUJ euYTfsfufS4/JT6464Ws5ppuUjIqlvx20vkjA+SOwvHc944xh3oIEWkOxVWL4d8sVBCtQ6bFrjb hWVtaIK1QCk7ZiV/4pIuepwDYnyqDR7XdYZ8JA76jzSP2AGQXg0ImXkbDXijKJHgYC012O3ksHX SYjFMGrVAYR9uoD3lAcHFAuHJZssiCyuKwdy1vX0UEDrlNABePoeoxG+bKIlTO0a+5fVh8z7MTb fydCQzgq+7jBEGw8VeN6a6Qt0++LL4CjHGEviV6JBuJ9rMC6OaZEJtOxW5npf47uj2uCbedVPxi 2U4OZSsowXe3kxp7pj2jFdcqQ4yuoOybvI3x9174e2u12S4k7HwvPkW/nghQIbhGBY8qFHp5 X-Proofpoint-GUID: kpQOMYYazyKyewxIir8QAhgrx-roNt3U X-Proofpoint-ORIG-GUID: kpQOMYYazyKyewxIir8QAhgrx-roNt3U X-Authority-Analysis: v=2.4 cv=W/M4VQWk c=1 sm=1 tr=0 ts=686e828d cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=Wb1JkmetP80A:10 a=hBMHHm5UMeqtWk0fnh8A:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.7,FMLib:17.12.80.40 definitions=2025-07-09_03,2025-07-08_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 mlxscore=0 priorityscore=1501 adultscore=0 clxscore=1011 suspectscore=0 spamscore=0 lowpriorityscore=0 mlxlogscore=754 bulkscore=0 impostorscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2507090133 I'm seeing a problem on s390 with the new "SOCK_STREAM transport change null-ptr-deref" test. Here is how it appears to happen: test_stream_transport_change_client() spins for 2s and sends 70K+ CONTROL_CONTINUE messages to the "control" socket. test_stream_transport_change_server() spins calling accept() because it keeps receiving CONTROL_CONTINUE. When the client exits, the server has received just under 1K of those 70K CONTROL_CONTINUE, so it calls accept() again but the client has exited, so accept() never returns and the server never exits.