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Mon, 8 Jun 2026 12:04:15 +0000 (GMT) Message-ID: Date: Mon, 8 Jun 2026 17:34:14 +0530 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [BUG] kernel BUG in team driver: buffer overflow in team_add_slave() From: Yeswanth Krishna To: netdev@vger.kernel.org, venkat88@linux.ibm.com Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org References: <3ad19e86-234c-408f-896e-0d6c774fea49@linux.ibm.com> Content-Language: en-US In-Reply-To: <3ad19e86-234c-408f-896e-0d6c774fea49@linux.ibm.com> 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=HppG3UTS c=1 sm=1 tr=0 ts=6a26afc2 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=6i1IRE6oVdN0yyl8cBUA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: fYkDlWuD2UVKzKd4I3KTttXR0ut-jb0n X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjA4MDEwOSBTYWx0ZWRfXzNH1u+l6N4uG mGMm3mzOVvIvR2symKd0+harZ2tuIyyJf9SQp4r9N8uLgHyH9Vd1AuRyBRqksJUuNkcL+36wHEI Kj3VSQWQzBd006tsWpOKkndWqpD+0Aym+XF2AXiBjr2DxNlHrImtZgXBs9+la3hIliCJdHUunOl 74XA3mqvTb8c8bCpYEt8QZHbKDCKnPZyhE5OviAasY8/C3xW/0tS6O6ff5srkXuwnn8DKv1ES1J 2n9LGmv1Iy/cL2hW7FHiM7cW1Y3fiuZeepM2fXnvhBvzSCIjY7HF4ZgNnYymfYTPXHfNjYUkwjm 2dFR1WEyXsCP/Bt/n51dQxC07WwD5m/J6F08aZ9RQVWJenY4kZYEXNTOtecBFm/50wdTaIXtXen +1TFF/w7kU0nW6xk5ZhUbMRgPagWri6UaYfkkqp6/ojeGN5UUYTbxHScrCVlyfG3zLE7cJxb5Oy 4iSXKWkC4lyi2FGt1mA== X-Proofpoint-ORIG-GUID: fYkDlWuD2UVKzKd4I3KTttXR0ut-jb0n 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_03,2026-06-05_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 phishscore=0 malwarescore=0 impostorscore=0 priorityscore=1501 clxscore=1015 bulkscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2606080109 Please add this tag Reported-by: yeswanth On 08/06/26 3:30 pm, Yeswanth Krishna wrote: > 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 >