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Wed, 16 Sep 2026 08:41:48 +0000 (GMT) Received: from [9.61.253.212] (unknown [9.61.253.212]) by smtpav01.wdc07v.mail.ibm.com (Postfix) with ESMTP; Wed, 16 Sep 2026 08:41:48 +0000 (GMT) Message-ID: <56d51dc6-f597-4cfa-b61c-b6b95d61ab86@linux.ibm.com> Date: Wed, 16 Sep 2026 14:11:46 +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-GB To: 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 , Shrikanth Hegde Cc: LKML From: Venkat Rao Bagalkote Subject: [BUG] powerpc/bpf: Kernel stack corruption in avc_has_perm() during BPF kselftests (test_progs) 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: AW1haW4tMjYwOTE2MDExMCBTYWx0ZWRfXxtmIj8RKbqVM Gnu5YrEmJxW9lyo2XbqL5CZ7sXcBZKEJXIABjLJgqZtlnEuJjGFrzv1YpnG3/0LqFivCkcYj1pS HTTjmptjKG7KbvqJ115dfkTVzhzrezdEX6+bMc10gJIeEvs3Ig4nGzUsSAACnOVWrwNe5/MkUKF pmIoo4p/I4n5+7JO2dl4NpHM6bojZwybM3fKhbp2YW6M/MUVVKH9cZ8JlZHWtA8F7Hkcs5dhsCS m/DNOBRkpRv20FrIJQddhc3TPuC+q0Xrebg/6dvo1X3d80JVXWRl3ex7GsMB5Lj3IDyQyyWbnD6 Ykxn2NbqE0A3YTbZgaLXzaMLUNszonp5Cg6W/hIcDImoZjBS7/Cczyf6OwRo7QWI/ptSDAmO84s 2/T8DGee7lcHnjPW+dZMhbjWMBqgYLqy8ht+VGX2BPcRQgPyiN71u5pSm5fVEqvm5LUl6pQUUUm oQ5IQPKILllKH8z1QBg== X-Proofpoint-Spam-Info: AW1haW4tMjYwOTE2MDExMCBTYWx0ZWRfX5aeFEelAtDbQ JrPfBaERzAnABXuwL6zZr/Q+5UJf8ijophZgn0Gb24kB8wYKMg9ZiGK0yE5Tx/u4b8oIa2ycsfA 6OfNe9WTdUWBFWFlcQr27ZFRIby6HbY= X-Authority-Analysis: v=2.4 cv=Zsx4uN7G c=1 sm=1 tr=0 ts=6aaa5653 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=Yb77rMnAWnyX_ecM6KAA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: j98Y_b2jO6-Gh9393PrUzOcghDvJkpk8 X-Proofpoint-GUID: xJvvkfB_yyaOFUBVlnp-o2L26sWwbki2 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 malwarescore=0 impostorscore=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 bulkscore=0 adultscore=0 phishscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609160110 Hello All!!! IBM CI has reported a kernel panic on PowerPC (ppc64le, POWER9 pSeries guest) while running BPF kselftests (test_progs). Environment: 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.