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Wed, 16 Sep 2026 10:33:11 +0000 (GMT) Received: from smtpav01.wdc07v.mail.ibm.com (smtpav01.wdc07v.mail.ibm.com [10.39.53.228]) by smtprelay05.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 68GAXAqV33751758 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 16 Sep 2026 10:33:10 GMT Received: from smtpav01.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4024D58055; Wed, 16 Sep 2026 10:33:10 +0000 (GMT) Received: from smtpav01.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id BC8F158063; Wed, 16 Sep 2026 10:33:05 +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 10:33:05 +0000 (GMT) Message-ID: Date: Wed, 16 Sep 2026 16:03:04 +0530 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list 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: Shrikanth Hegde , 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> <46508541-55ab-4340-8871-924514ee8d5b@linux.ibm.com> Content-Language: en-GB From: Venkat Rao Bagalkote In-Reply-To: <46508541-55ab-4340-8871-924514ee8d5b@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: AW1haW4tMjYwOTE2MDEzOCBTYWx0ZWRfX/tfu/7f6+CUZ SqZ8XiLBqWI7Lus+jh8nmfUke0YdIFNRZIpUrGJXbgsR3/E+1PBjAWQrx05T+CuE6PwJan/E2V7 KkRdIygF49aGHljqwttC4HpVcqHvit0Axmm70+aV8xUqmwlzEYSjDd+JCjKoVBJTo4r4Rv7x45t Pv95CikB2BmHL9ZieU3ehQu7g69Ros4FqIZCcOG5m3RY8jiiuUcMZJfa2ds/g27r0w2zfdUOsOP 899Q+oHtb8WW6rHujUYPmu0hyLXqh6rQXZbPDKdCO58LETbpG6Vk8nFcEiUSMg/+AurzqzuMRw+ +mqrWUQoos3kA5Acqe/YvK/HslUg+EY9POMTZoX24fafk7hbf15T5eHyTOhzStpWyaknelEYK15 ikULV0LV6vuS/JgVHJ6iStXt0NS0hVrx4jRxnuJLVr3+WMIzCxoJ+Xv3zO1uKbTlCnow2yq4mBa pUjh0gYT5P90ymtHN0A== X-Authority-Analysis: v=2.4 cv=E/NYNqdl c=1 sm=1 tr=0 ts=6aaa7068 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=6zCX1olo2Mcs3fojgbkA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: GhwMK2bzqtSiB7ygT_iyaZZdvnTwOMjY X-Proofpoint-Spam-Info: AW1haW4tMjYwOTE2MDEzOCBTYWx0ZWRfX59mRAOtMlHEf pV7rl2RAyTf0M4JTV5wbRgJb/6Ti+vZLy91pioiBOCKHltPxO3H6sDDMFP8KStiQ3gS/pV++LLr V37VImKE00AQxC+JSsOb/4rNY9JEkNY= X-Proofpoint-GUID: Gkg2wqQ5PA4Wu5DZ_cJO1oyLFUWSd1H_ 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 impostorscore=0 lowpriorityscore=0 priorityscore=1501 spamscore=0 adultscore=0 clxscore=1015 bulkscore=0 malwarescore=0 suspectscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609160138 On 16/09/26 2:22 pm, Shrikanth Hegde wrote: > 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? Nothings in specific. Its just that, some of the tests were not run for some time, due to build and other issues. > >> 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. >> > >