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Wed, 09 Sep 2026 03:59:32 +0000 (GMT) Received: from smtpav01.dal12v.mail.ibm.com (smtpav01.dal12v.mail.ibm.com [10.241.53.100]) by smtprelay02.dal12v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 6893xWnJ34996530 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 9 Sep 2026 03:59:32 GMT Received: from smtpav01.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1934558059; Wed, 9 Sep 2026 03:59:32 +0000 (GMT) Received: from smtpav01.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6EAC758057; Wed, 9 Sep 2026 03:59:30 +0000 (GMT) Received: from smtpclient.apple (unknown [9.123.0.173]) by smtpav01.dal12v.mail.ibm.com (Postfix) with ESMTPS; Wed, 9 Sep 2026 03:59:30 +0000 (GMT) Content-Type: text/plain; charset=utf-8 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 (Mac OS X Mail 16.0 \(3864.600.51.1.1\)) Subject: =?utf-8?Q?Re=3A_=5Bmainline=5D_powerpc/TM=3A_Unexpected_TM_Bad_Th?= =?utf-8?Q?ing_during_core_dump_on_POWER9_=287=2E1=E2=80=91rc1=29?= From: Venkat In-Reply-To: Date: Wed, 9 Sep 2026 09:29:17 +0530 Cc: linuxppc-dev , Madhavan Srinivasan , LKML , Christophe Leroy Content-Transfer-Encoding: quoted-printable Message-Id: References: <364996ce-aba2-4213-8d20-7dd481b43fe6@linux.ibm.com> To: Madhavan Srinivasan X-Mailer: Apple Mail (2.3864.600.51.1.1) X-TM-AS-GCONF: 00 X-Proofpoint-GUID: OMpjB8Psd7KYoBm6h9h4Ed69GfUq9F5n X-Authority-Analysis: v=2.4 cv=RIaD2Yi+ c=1 sm=1 tr=0 ts=6aa0d9a5 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=5KLPUuaC_9wA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=MYg0dNiN2xP4QECReYwA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA5MDAzNyBTYWx0ZWRfX0eYyKAanKhk1 DZqei4Aqa7Uirr9S4fNWSfZkcf899N7pUhoEoRZMDD8RMq0fm8Dr+y+9q1mT4CZqLeV2u8QKbKh Jgj1xMicrzk8sCNkGP36sAzenO0N3fs= X-Proofpoint-ORIG-GUID: OMpjB8Psd7KYoBm6h9h4Ed69GfUq9F5n X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA5MDAzNyBTYWx0ZWRfX34FZLi13i9HH IIsdqcHbFUl7B0MZ5NLvSCofMvO/FyOvTUKpCNrXVWqZ4GN6x+eCmYRZWVUZaX69GJwxwvwVVmp 12d8GltfySmU/jQ9mrrbOAbxdFlSC4sPhrHo18OaHmz3UJ4URCod63TA3NoBKBbU7yUnC8EMBGt 5AdZHMM5g2mKdHcrf0cPstvGImUTqDtUDEtKECfdHMjIUNdK2FMtQH/ZnHgcatBD7G267KVsb06 Wa7xHBA3bMKF3sIu33eIx75ivO6d9uH+IMv+0/pmdw0ApzKXhTgLuXBmOwE/xvTSU3TwUpjsz8Y LnBnkfbues1hkSIiko3qrS5rq8DhvZrdUCEsPeLr55UOrpc2Rr//OdpgCwpCe68QJzT7nriMyli qzeiCc1z4ImCP3RgaKyV5nm5UwjtNO9E9RyKldV3gGc59OAAe7kNNktjKvtCClrrcx/L5N1ewhO Me8OLMjW+CWhlk8j7Jg== 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=2026-09-08_03,2026-09-08_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 priorityscore=1501 bulkscore=0 adultscore=0 phishscore=0 clxscore=1015 impostorscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609090037 > On 15 May 2026, at 10:59=E2=80=AFAM, Venkat Rao Bagalkote = wrote: >=20 >=20 > On 28/04/26 5:48 pm, Venkat Rao Bagalkote wrote: >> Greetings!! >>=20 >> IBM CI has reported a kernel crash while running = selftests/powerpc/signal on a POWER9 pSeries system. >>=20 >> I attempted to reproduce this issue manually, but was not successful = so far. >=20 > I=E2=80=99m now able to reproduce this issue reliably and = consistently. The reproduction steps are simple: >=20 > Run selftests/powerpc/signal >=20 This issue is still present in 7.3-rc2 as well. Please let me know, if = it=E2=80=99s invalid bug, I will make appropriate changes to my CI set = up. This is blocking for me. Traces: [12689.799298] Unexpected TM Bad Thing exception at c00000000000dbac = (msr 0x8000000302a03031) tm_scratch=3D800000010280b033 [12689.799318] Oops: Unrecoverable exception, sig: 6 [#1] [12689.799323] LE PAGE_SIZE=3D64K MMU=3DHash SMP NR_CPUS=3D8192 NUMA = pSeries [12689.799330] Modules linked in: nvram(E) rpadlpar_io(E) rpaphp(E) = bonding(E) tls(E) rfkill(E) nft_fib_inet(E) nft_fib_ipv4(E) = nft_fib_ipv6(E) nft_fib(E) nft_reject_inet(E) nf_reject_ipv4(E) = nf_reject_ipv6(E) nft_reject(E) nft_ct(E) nft_chain_nat(E) hvcs(E) = hvcserver(E) pseries_rng(E) sg(E) vmx_crypto(E) drm(E) fuse(E) = drm_panel_orientation_quirks(E) xfs(E) nvme_tcp(E) nvme_fabrics(E) = nvme_core(E) sr_mod(E) sd_mod(E) cdrom(E) ibmvscsi(E) ibmveth(E) = scsi_transport_srp(E) dm_mirror(E) dm_region_hash(E) dm_log(E) dm_mod(E) [12689.799397] CPU: 0 UID: 0 PID: 1159004 Comm: sigfuz Tainted: G = E 7.3.0-rc2-next-20260907 #1 PREEMPT=20 [12689.799405] Tainted: [E]=3DUNSIGNED_MODULE [12689.799408] Hardware name: IBM,8375-42A POWER9 (architected) 0x4e0202 = 0xf000005 of:IBM,FW950.80 (VL950_131) hv:phyp pSeries [12689.799414] NIP: c00000000000dbac LR: c0000000008657f0 CTR: = 0000000000000046 [12689.799419] REGS: c00000002e86fd60 TRAP: 0700 Tainted: G = E (7.3.0-rc2-next-20260907) [12689.799425] MSR: 8000000302a03031 = CR: 48004840 XER: 00000000 [12689.799444] CFAR: c00000000000da68 IRQMASK: 0=20 [12689.799444] PACATMSCRATCH: 800000010280b033=20 [12689.799444] GPR00: 0000000000000000 c000000050ff7590 c000000001ba8100 = c0000003ccf6dd00=20 [12689.799444] GPR04: c00000031027dd00 0000000000010000 0000000000000000 = 0000000000002300=20 [12689.799444] GPR08: 0000000000000000 0000000000000000 0000000000000000 = 0000000000000000=20 [12689.799444] GPR12: 0000000000000000 c0000000030d0000 0000000000000000 = 0000000000000000=20 [12689.799444] GPR16: 0000000000000000 0000000000000000 0000000000000000 = 0000000000000000=20 [12689.799444] GPR20: 0000000000000000 0000000000000000 0000000000000000 = c000000045beab00=20 [12689.799444] GPR24: 0000000000000000 0000000000000001 c00c000000f33d80 = 0000000010010000=20 [12689.799444] GPR28: c00000004575fe00 c000000050ff7b38 0000000010000000 = c00c000000c409c0=20 [12689.799507] NIP [c00000000000dbac] = interrupt_return_srr_kernel+0x15c/0x18c [12689.799518] LR [c0000000008657f0] dump_user_range+0x100/0x570 [12689.799525] Call Trace: [12689.799529] [c000000050ff7690] [c0000000008657f0] = dump_user_range+0x100/0x570 [12689.799536] [c000000050ff7770] [c00000000085aefc] = elf_core_dump+0x52c/0x5c0 [12689.799545] [c000000050ff7980] [c000000000864a20] = coredump_write+0xe0/0x410 [12689.799552] [c000000050ff7a10] [c000000000864e10] = do_coredump.constprop.0+0xc0/0x4e0 [12689.799559] [c000000050ff7af0] [c00000000086558c] = vfs_coredump+0x35c/0x4c0 [12689.799565] [c000000050ff7c30] [c000000000256808] = get_signal+0x918/0xad0 [12689.799573] [c000000050ff7d20] [c000000000021ba8] = do_signal+0x78/0x330 [12689.799582] [c000000050ff7dc0] [c0000000014f6d48] = irqentry_exit+0x358/0x990 [12689.799589] [c000000050ff7e20] [c00000000002f554] = program_check_exception+0xd4/0x100 [12689.799596] [c000000050ff7e50] [c000000000009b2c] = program_check_common_virt+0x3bc/0x3c0 [12689.799604] ---- interrupt: 700 at 0x10001e8c [12689.799610] NIP: 0000000010001e8c LR: 0000000010001e74 CTR: = 00007fffba290590 [12689.799615] REGS: c000000050ff7e80 TRAP: 0700 Tainted: G = E (7.3.0-rc2-next-20260907) [12689.799620] MSR: 8000000302a0f033 = CR: 240044a0 XER: 00000000 [12689.799640] CFAR: 00007fffba2905bc IRQMASK: 0=20 [12689.799640] PACATMSCRATCH: 800000010280b033=20 [12689.799640] GPR00: 0000000010001e74 00007fffa2fdd3c0 0000000010027f00 = 0000000022bde198=20 [12689.799640] GPR04: 00007fffa2fdd384 00007fffba48004c 00007fffba480090 = 00007fffba480048=20 [12689.799640] GPR08: 00000001457bc331 0000000022bde198 0000000000000000 = 0000000022bde198=20 [12689.799640] GPR12: 00007fffba290590 00007fffa2fe68e0 0000000000000000 = 00007fffa2fdf1e0=20 [12689.799640] GPR16: 0000000000000000 00007fffa2fdf8e0 0000000000000720 = 0000000000000000=20 [12689.799640] GPR20: 0000000000000000 00007fffba580000 000000000080e9e0 = 00007fffa27d0000=20 [12689.799640] GPR24: 0000000000000001 00007ffff129f3a0 0000000000000000 = 00007fffa2fde8f8=20 [12689.799640] GPR28: 000000000000000a 0000000000000000 00000000100201bc = 000000000011af5c=20 [12689.799703] NIP [0000000010001e8c] 0x10001e8c [12689.799707] LR [0000000010001e74] 0x10001e74 [12689.799711] ---- interrupt: 700 [12689.799714] Code: 7c8903a6 7ca103a6 f8010020 e8410040 e8610048 = e8810050 e8a10058 40c6001c 7ccff120 e8c10060 e8010030 e8210038 = <4c000024> 48000000 7ccff120 f92d0080=20 [12689.799736] ---[ end trace 0000000000000000 ]--- Regards, Venkat. > Regards, >=20 > Venkat. >=20 >>=20 >> Below are the details of the crash as reported by CI. >>=20 >> Crash Details: >>=20 >> [ 9798.880148] Unexpected TM Bad Thing exception at c00000000000dbac >> (msr 0x8000000302a03031) tm_scratch=3D800000010280b033 >> [ 9798.880160] Oops: Unrecoverable exception, sig: 6 [#1] >> [ 9798.880165] LE PAGE_SIZE=3D64K MMU=3DHash SMP NR_CPUS=3D8192 NUMA = pSeries >> [ 9798.880173] Modules linked in: nvram(E) rpadlpar_io(E) rpaphp(E) = ... >> [ 9798.880233] CPU: 8 UID: 0 PID: 1039530 Comm: sigfuz >> Tainted: G E 7.1.0-rc1 #1 PREEMPT >> [ 9798.880245] Hardware name: IBM,8375-42A POWER9 (architected) >> hv:phyp pSeries >> [ 9798.880251] NIP: c00000000000dbac LR: 0000000010001e58 >> [ 9798.880262] MSR: 8000000302a03031 = >>=20 >>=20 >> Call Trace: >>=20 >>=20 >> NIP [c00000000000dbac] interrupt_return_srr_kernel+0x15c/0x18c >> Call Trace: >> tm_reclaim_thread >> flush_tmregs_to_thread >> vsr_get >> regset_get_alloc >> fill_thread_core_info.isra.0 >> fill_note_info >> elf_core_dump >> coredump_write >> do_coredump >> vfs_coredump >> get_signal >> do_signal >> do_notify_resume >> interrupt_exit_user_prepare_main >> interrupt_exit_user_prepare >> interrupt_return_srr_user >>=20 >>=20 >> Please let me know if further details are required. >>=20 >>=20 >> If you happen to fix this issue, please add below tag. >>=20 >> Reported-by: Venkat Rao Bagalkote >>=20 >>=20 >>=20 >> Regards, >>=20 >> Venkat. >>=20 >>=20