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Wed, 9 Sep 2026 05:19:36 +0000 (GMT) Content-Type: text/plain; charset=utf-8 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 10:49:23 +0530 Cc: linuxppc-dev , LKML , Christophe Leroy Content-Transfer-Encoding: quoted-printable Message-Id: <439365B6-D0F8-4AB9-ABA5-020FDB50F523@linux.ibm.com> References: <364996ce-aba2-4213-8d20-7dd481b43fe6@linux.ibm.com> To: Madhavan Srinivasan , thibault.ferrante@canonical.com X-Mailer: Apple Mail (2.3864.600.51.1.1) X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 6W99u9_9eivxwB10KtA-eCKaokS0PlJD X-Proofpoint-ORIG-GUID: 6W99u9_9eivxwB10KtA-eCKaokS0PlJD X-Authority-Analysis: v=2.4 cv=RNCD2Yi+ c=1 sm=1 tr=0 ts=6aa0ec6b cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=5KLPUuaC_9wA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VwQbUJbxAAAA:8 a=DfNHnWVPAAAA:8 a=VnNF1IyMAAAA:8 a=QC0v0_FW1Z5KRakCRfEA:9 a=QEXdDO2ut3YA:10 a=rjTVMONInIDnV1a_A2c_:22 X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA5MDA1NSBTYWx0ZWRfX61JqqdB7BjZh /0FLaEodGXhMSqu0pv16a2uxVb5YeWZ6E34cRp4Lgksa0YORiozXJQ/Tn5o53h9SzN2J1sK1G4b VjBXm6+z8DmtlCtGd7mC3yA0Zke3wZw= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA5MDA1NSBTYWx0ZWRfX6gIBOmrlv1o8 RcR94wbCozJTF4JW+S9GrSSLOltbn8K+siVwnx3qLEA5iOL6O/MQ+pTBodgeC9zgQ8S6bc2mxoo PY36ioPvj2zVviAsQEQpz8ERBOEoGbAQhh+RTyl3fTBsubwtC5UDbmwyK9dQcGXkJOcrbGZbNry ug8bwn0IdGNZRGFWJU4MbFB2MrR+u2s3czWxdsObecOHbIJcval4e7iPDoAb5iPMo+YJT7bl6Dq JOMkhTEy9+A4KW+I7Cma3YqwPdXcxDZ3m0ZECjXyikqFSqgMfVIp6qiyRDBBV3Vo6vnGsm1Wt/Q Vpucjmutt+hMV0YqVQ0guNtByoAUll+OMkRibKxnFcihI+Kf1vQcZ3DhlNQSmixEAsvNNsQPtDM u7hM7kJ1dYUOH5TEXL5nPVDcU3THWx+b9+tVo7sEPhcrmXIBVkVNzCVftSTNv+ZH2p+ZFH42MuJ MzGwZYc+gp6O1+XAUFw== 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 priorityscore=1501 lowpriorityscore=0 bulkscore=0 clxscore=1011 spamscore=0 impostorscore=0 adultscore=0 phishscore=0 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609090055 > On 9 Sep 2026, at 9:29=E2=80=AFAM, Venkat = wrote: >=20 >=20 >=20 >> 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 >=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. >=20 > This is blocking for me. With this patch, signal selftests are running fine. = https://lore.kernel.org/all/20260907215420.1258678-1-thibault.ferrante@can= onical.com/ Regards, Venkat. >=20 > Traces: >=20 > [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 ]--- >=20 > 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.