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Mon, 8 Jun 2026 10:00:01 +0000 (GMT) Message-ID: <3ad19e86-234c-408f-896e-0d6c774fea49@linux.ibm.com> Date: Mon, 8 Jun 2026 15:30:00 +0530 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 To: netdev@vger.kernel.org, venkat88@linux.ibm.com Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org From: Yeswanth Krishna Subject: [BUG] kernel BUG in team driver: buffer overflow in team_add_slave() Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=b4uCJNGx c=1 sm=1 tr=0 ts=6a2692a4 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=qBxafnndnmzGIJbaEr4A:9 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: EeGipkoIuz3k5KIeLN3h9n4452L9zIqE X-Proofpoint-GUID: EeGipkoIuz3k5KIeLN3h9n4452L9zIqE X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjA4MDA4OSBTYWx0ZWRfX0ddjqY7emiR9 DZZvPaoV2dNPCtRetacd+xFFzYlp9m9rnMcyx/VN1m3NCQl/1Zrd7KL1g6uSwpJ21F6ZtP/8KDS +qOwCC8mCzF6eFgD0FQiuLDqvGu9z9pPZsp21H2MeYORSRjsbHHZFQnpEBBeht39wuDiIbM0vfM RrbHxa6mMn8KzpYem4GLTq/+DCWlzrpT72sea+XbZXdB9Z0lZRti16FF0GaxfIRsBd8333qsgFr qhS/i8TEaNFfGAUcSkOfgaW5ILdBWS9GjkRrdo+Uc3uoeYqRFFHMjHK86GCRAuz9BwDwOrJoaDF RDQfq3WEhAJp00LNaAWc6CcE3VLwQG8+qfnTtmvet/ainqvzSnmxgi+kbmBsMYVBZSJAK6KRYEt lvBx/t30de8nQ/oI/4Goi6SJYo9NgP8FOUQ0UaQ4MKNq+IpYbsDPM1chgpeI1UQAlYBoPKyWSfd VJ/2v2sxlcGsONNJKvg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-08_02,2026-06-05_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1011 spamscore=0 bulkscore=0 phishscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 malwarescore=0 impostorscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2606080089 Hi Team , I encountered a kernel crash while running selftests on kernel 7.1.0-rc6 on a POWER10 system. The crash occurs when adding a slave device to a team interface, triggered by FORTIFY_SOURCE detecting a buffer overflow. **System Information:** - Kernel: 7.1.0-rc6-160099.42-default+ (commit d548c6f4301b) - Architecture: powerpc64le (ppc64le) - Hardware: IBM POWER10 (9043-MRX), pSeries - Config: CONFIG_FORTIFY_SOURCE=y **Crash Location:** [ 3492.897824][T77143] kernel BUG at lib/string_helpers.c:1044! [ 3492.898057][T77143] NIP [c000000000ac1120] __fortify_panic+0x18/0x28 [ 3492.898096][T77143] [c00000000efdb350] [c00800000b857a18] team_add_slave+0xc60/0xcc0 [team] **Call Trace:** __fortify_panic+0x18/0x28 team_add_slave+0xc60/0xcc0 [team] do_set_master+0x19c/0x240 do_setlink.isra.0+0x388/0x1450 rtnl_newlink+0xac8/0x1030 rtnetlink_rcv_msg+0x450/0x530 netlink_rcv_skb+0x74/0x1b0 rtnetlink_rcv+0x24/0x40 netlink_unicast+0x2e0/0x430 netlink_sendmsg+0x210/0x580 ____sys_sendmsg+0x30c/0x470 ___sys_sendmsg+0x94/0xf0 __sys_sendmsg+0x84/0x100 system_call_exception+0x154/0x2b0 **Reproducer:** The crash is 100% reproducible via selftests: ```bash cd tools/testing/selftests make -C drivers/net/team run_tests Please add below reported-by tag: yeswanth Thanks, Yeswanth Krishna