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Wed, 16 Sep 2026 08:52:16 +0000 (GMT) Received: from [9.124.211.8] (unknown [9.124.211.8]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 16 Sep 2026 08:52:16 +0000 (GMT) Message-ID: <46508541-55ab-4340-8871-924514ee8d5b@linux.ibm.com> Date: Wed, 16 Sep 2026 14:22:15 +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 Subject: Re: [BUG] powerpc/bpf: Kernel stack corruption in avc_has_perm() during BPF kselftests (test_progs) To: Venkat Rao Bagalkote , Hari Bathini , Saket Kumar Bhaskar , bpf , linuxppc-dev , Kumar Kartikeya Dwivedi , Daniel Borkmann , Eduard Zingerman , yonghong.song@linux.dev, Alexei Starovoitov , andrii@kernel.org, Madhavan Srinivasan , Ritesh Harjani Cc: LKML References: <56d51dc6-f597-4cfa-b61c-b6b95d61ab86@linux.ibm.com> Content-Language: en-US From: Shrikanth Hegde In-Reply-To: <56d51dc6-f597-4cfa-b61c-b6b95d61ab86@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTE2MDExMCBTYWx0ZWRfX85SvrvPSfOMd +01q75rsafsdLmXw9Cuv5vcS5oUeflNU37aA2PsJ6iKPDeuHyVWE2+W9aY8M2TUP1N16K/SM23F hPi4xWMDaeYXbLgI58AFJoKFQGVUyc7kDKflTKcjZTGdXk1c+JcmeWWUuLMPTRhd499LdjOwMdg m1zQwFrqE+c7OG/k/QlzdVSRcO5L15JTmoBr28RzfRZ1DKDxDGNd33Sk16nHB59qpMXPXD1l+hj xdnM0tKxzynbU6pN5uZoX7pYLec62PoCbPVuvMPMRHGI47BnJns/fhVWaaEDTukzwA2JdP+aqqy TputCIxDFXeswtnmQ5pAK+M1GyFu7VnQqZAeow3gc+DreQrcfXgMuQM3LoZChK2BnkF8A1AQf9O XAtB0DZXXybV5pwVDUSlkzgbyz96gw0MuaeEFwR7jPUPolUP/bdzbARLdgCUXZAzyhEcii40yFs CE36Z5E1WS6S/cdwQ5w== X-Proofpoint-ORIG-GUID: aHG0o8l-4_Y4D9r7LWH8I8O8n9cPJ_vt X-Proofpoint-GUID: fyzoQu-Kdur9Wn_W0C6nqJrwiazL0iUC X-Proofpoint-Spam-Info: AW1haW4tMjYwOTE2MDExMCBTYWx0ZWRfXwr8pipsY7Kvj WN72Hr5zgO7JiFb1TvGJYSdG/MyIpDDtqeb37/KJsI2n6mQ7R2oXEVmfEfsz3Pr+LgPBPz90cBo Me1rf6sdVYq+qA9mxlyoaIYx8URQ1Wg= X-Authority-Analysis: v=2.4 cv=cY9HPXDM c=1 sm=1 tr=0 ts=6aaa58c9 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=Oc1KoJq9fdCeQZ6uml4A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-15_05,2026-09-15_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 spamscore=0 bulkscore=0 clxscore=1011 suspectscore=0 impostorscore=0 malwarescore=0 phishscore=0 adultscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609160110 Hi Venkat. Thanks for reporting. On 9/16/26 2:11 PM, Venkat Rao Bagalkote wrote: > Hello All!!! > > > IBM CI has reported a kernel panic on PowerPC (ppc64le, POWER9 pSeries guest) while running BPF kselftests (test_progs). > What has changed in CI that it is hitting now? > Environment: > It is very likely same as https://lore.kernel.org/all/ba9759d0-b1f2-4b33-aff5-769cf89bd584@linux.ibm.com/ > > Kernel version: 7.3.0-rc3-gf6e7b42bf05b (PREEMPT) > Architecture: ppc64le (POWER9 - IBM,8375-42A pSeries / phyp) > Test Suite: Avocado FVT / kselftests (tools/testing/selftests/bpf/test_progs) > > > Traces: > > [ 1359.516833] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: avc_has_perm+0x23c/0x240 > [ 1359.516856] CPU: 0 UID: 0 PID: 49806 Comm: test_progs Tainted: G      OE K     7.3.0-rc3-gf6e7b42bf05b #1 PREEMPT > [ 1359.516866] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE, [K]=LIVEPATCH > [ 1359.516870] Hardware name: IBM,8375-42A POWER9 (architected) 0x4e0202 0xf000005 of:IBM,FW950.80 (VL950_131) hv:phyp pSeries > [ 1359.516876] Call Trace: > [ 1359.516880] [c00000011bc67b10] [c0000000014627c0] dump_stack_lvl+0x84/0xc0 (unreliable) > [ 1359.516890] [c00000011bc67b40] [c000000000234840] vpanic+0x1b4/0x47c > [ 1359.516897] [c00000011bc67be0] [c000000000234b44] do_panic_on_target_cpu+0x0/0x2c > [ 1359.516906] [c00000011bc67c00] [c0000000014f8ce8] __stack_chk_fail+0x48/0x60 > [ 1359.516913] [c00000011bc67c70] [c00000000092f0bc] avc_has_perm+0x23c/0x240 > [ 1359.516920] [c00000011bc67d40] [c000000000936fc0] selinux_task_getpgid+0x80/0xa0 > [ 1359.516927] [c00000011bc67d80] [c000000000920190] security_task_getpgid+0x70/0x1c0 > [ 1359.516934] [c00000011bc67db0] [c000000000259488] do_getpgid+0xa8/0xf0 > [ 1359.516941] [c00000011bc67de0] [c0000000002594f0] sys_getpgid+0x20/0x30 > [ 1359.516948] [c00000011bc67e00] [c000000000034670] system_call_exception+0x160/0x480 > [ 1359.516957] [c00000011bc67e50] [c00000000000d05c] system_call_vectored_common+0x15c/0x2ec > > > Please let us know if any further debugging or testing with specific BPF JIT options is needed. > > > Regards, > > Venkat. >