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Mon, 9 Jun 2025 06:24:52 +0000 (GMT) Message-ID: <7b0370c1-4917-4fba-823e-7b5c6c1f8a60@linux.ibm.com> Date: Mon, 9 Jun 2025 11:54:50 +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: LKML , linuxppc-dev , Madhavan Srinivasan From: Venkat Rao Bagalkote Subject: [mainline]Kernel OOPs at migrate_swap_task Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 1FlT2uhghWZu1LC6ACPm_wX5EeaAdFz8 X-Proofpoint-GUID: 1FlT2uhghWZu1LC6ACPm_wX5EeaAdFz8 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNjA5MDA0OCBTYWx0ZWRfXxvG+3ZdfB2sA vWT5aFwwyiEuKbcmhwA4d8MskM/RRtPEl6BgtEh2WcuPD80SDjDPIjwCube1OVY80Kh5T+wQ9vp dLJb3l/phBrAOOXwXQg39sXy9fvQcIu91c87HtH0yr6HiqRdcT0FxvUFnLN1vP7USSj7fZfYDVA fQir2bqt5kWYTpgwhowLolOJpiHcVAeEwV0SrWbqO3SrWJHWc/On6lmIBJI0JI8nlh1ILWoX9Ki cwaEEaUqsVSVhBxgCsb7B+EdLa/p3+R8ClgclsAClC2B3dWsJoyFkuicR2C1WgHxYKn6sKcyyBu rc9LwHIS+y5FAF21B1smOBf3pa8hbnIRTBHk/ZXVcQqI9mDn8dO0zurSzI0aG86gIP+zK/dmIJ/ bEOIdw7/h2HZevDXiysZd6bQxduY9pt+iHRN0evIR5PRNrrWECrUROuOyZ0xSyGQ/OaqK5HH X-Authority-Analysis: v=2.4 cv=CfMI5Krl c=1 sm=1 tr=0 ts=68467e38 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=6IFa9wvqVegA:10 a=NEAV23lmAAAA:8 a=VnNF1IyMAAAA:8 a=W4kWWihBoIyN2mbi5FAA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-06-09_02,2025-06-05_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 spamscore=0 phishscore=0 priorityscore=1501 clxscore=1015 impostorscore=0 mlxscore=0 suspectscore=0 mlxlogscore=819 adultscore=0 malwarescore=0 lowpriorityscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2506090048 Hello, IBM CI has reported a kernel oops, while running cpu monitor test [1], on the mainline kernel. [1]: https://github.com/avocado-framework-tests/avocado-misc-tests/blob/master/cpu/cpupower_monitor.py I am still in porcess of doing git bisect, meanwhile, wondering if below traces gives any clue. Traces: [ 2181.567879] Kernel attempted to read user page (5b0) - exploit attempt? (uid: 0) [ 2181.567913] BUG: Kernel NULL pointer dereference on read at 0x000005b0 [ 2181.567918] Faulting instruction address: 0xc0000000001d4a48 [ 2181.567924] Oops: Kernel access of bad area, sig: 11 [#1] [ 2181.567929] LE PAGE_SIZE=64K MMU=Radix  SMP NR_CPUS=8192 NUMA pSeries [ 2181.567936] Modules linked in: dm_mod ext4 crc16 mbcache jbd2 loop nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 bonding tls rfkill ip_set nf_tables nfnetlink pseries_rng vmx_crypto fuse xfs sr_mod cdrom sd_mod sg ibmvscsi scsi_transport_srp ibmveth [last unloaded: scsi_debug] [ 2181.567990] CPU: 0 UID: 0 PID: 19 Comm: migration/0 Kdump: loaded Not tainted 6.15.0-ge271ed52b344 #1 VOLUNTARY [ 2181.568003] Stopper: multi_cpu_stop+0x0/0x22c <- migrate_swap+0xe8/0x214 [ 2181.568016] NIP:  c0000000001d4a48 LR: c0000000001d4a3c CTR: c0000000001d6864 [ 2181.568021] REGS: c0000000087ffaf0 TRAP: 0300   Not tainted (6.15.0-ge271ed52b344) [ 2181.568026] MSR:  8000000002803033   CR: 48004202  XER: 00000000 [ 2181.568038] CFAR: c00000000003a360 DAR: 00000000000005b0 DSISR: 40000000 IRQMASK: 3 [ 2181.568038] GPR00: c0000000001d4df4 c0000000087ffd90 c000000001648100 0000000000000003 [ 2181.568038] GPR04: 0000000000000010 0000000000000000 00000941d4c72888 0000000000000000 [ 2181.568038] GPR08: 00000004fdad0000 0000000000000000 000000000000013a 0000000000004000 [ 2181.568038] GPR12: c0000004ffd3c780 c000000002ff0000 c0000000001ae2e0 c0000000040533c0 [ 2181.568038] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 2181.568038] GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000001 [ 2181.568038] GPR24: c000000529930f4c 0000000000000000 c000000529930180 c000000642c60100 [ 2181.568038] GPR28: c000000642c60ecc c0000013fd68c700 0000000000000010 c000000642c60100 [ 2181.568088] NIP [c0000000001d4a48] __migrate_swap_task+0x6c/0x1d8 [ 2181.568094] LR [c0000000001d4a3c] __migrate_swap_task+0x60/0x1d8 [ 2181.568100] Call Trace: [ 2181.568103] [c0000000087ffd90] [c0000000001d4b70] __migrate_swap_task+0x194/0x1d8 (unreliable) [ 2181.568112] [c0000000087ffdc0] [c0000000001d4df4] migrate_swap_stop+0x240/0x2b4 [ 2181.568118] [c0000000087ffe20] [c0000000002efc04] multi_cpu_stop+0xd8/0x22c [ 2181.568123] [c0000000087ffe90] [c0000000002ef8e8] cpu_stopper_thread+0x158/0x24c [ 2181.568129] [c0000000087fff40] [c0000000001b93b0] smpboot_thread_fn+0x200/0x2c0 [ 2181.568137] [c0000000087fff90] [c0000000001ae40c] kthread+0x134/0x164 [ 2181.568144] [c0000000087fffe0] [c00000000000df98] start_kernel_thread+0x14/0x18 [ 2181.568150] Code: 60690001 992d0932 e90d0030 3d2200c2 39290378 7d49402a 394a0001 7d49412a 4be65771 60000000 60000000 e93f0a70 48426c89 60000000 2c230000 [ 2181.568165] ---[ end trace 0000000000000000 ]--- [ 2181.568687] If you happen to fix this, please add below tag. Reported-by: Venkat Rao Bagalkote Regards, Venkat.