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X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 8O76sYYkwNXtZdopV4xeSntdRjjZ7tEZzYYEkjlXR0jDtAqNf9Acxw3n5q3lotbyDZenyFAyIXeQxI7zZdyRMQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR11MB7382 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "Oops" on: commit: 596061ecef8ab0561e92704bcdc166fb91ecdec1 ("sched/fair: Add newidle balance to pick_task_fair()") https://git.kernel.org/cgit/linux/kernel/git/peterz/queue.git sched/flat in testcase: stress-ng version: stress-ng-x86_64-30f8b2f05-1_20251212 with following parameters: nr_threads: 100% testtime: 60s test: pipeherd cpufreq_governor: performance config: x86_64-rhel-9.4 compiler: gcc-14 test machine: 192 threads 2 sockets Intel(R) Xeon(R) 6740E CPU @ 2.4GHz (Sierra Forest) with 256G memory (please refer to attached dmesg/kmsg for entire log/backtrace) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202602061046.eee12820-lkp@intel.com [ 368.640460][T10417] #PF: supervisor write access in kernel mode [ 368.640462][T10417] #PF: error_code(0x0002) - not-present page [ 368.640465][T10417] PGD 0 P4D 0 [ 368.643193][T10417] Oops: Oops: 0002 [#1] SMP NOPTI [ 368.643198][T10417] CPU: 8 UID: 0 PID: 10417 Comm: stress-ng-pipeh Tainted: G S 6.19.0-rc6-00148-g596061ecef8a #1 PREEMPTLAZY [ 368.646302][T10417] Tainted: [S]=CPU_OUT_OF_SPEC [ 368.646303][T10417] Hardware name: IEIT SYSTEMS NF5180-M8-A0-R0-00/NF5180-M8-A0-R0-00, BIOS 00.14.04 09/23/2024 [ 368.646304][T10417] RIP: 0010:pick_next_task_fair (kernel/sched/sched.h:2673 kernel/sched/fair.c:9114) [ 368.649951][T10417] Code: 48 89 c3 49 81 be a8 02 00 00 a8 e1 bb 82 0f 85 e5 00 00 00 49 c7 86 a0 02 00 00 00 00 00 00 49 89 dd 49 8b 84 24 88 0a 00 00 <48> 89 83 a0 02 00 00 49 c7 84 24 88 0a 00 00 00 00 00 00 4c 39 f3 All code ======== 0: 48 89 c3 mov %rax,%rbx 3: 49 81 be a8 02 00 00 cmpq $0xffffffff82bbe1a8,0x2a8(%r14) a: a8 e1 bb 82 e: 0f 85 e5 00 00 00 jne 0xf9 14: 49 c7 86 a0 02 00 00 movq $0x0,0x2a0(%r14) 1b: 00 00 00 00 1f: 49 89 dd mov %rbx,%r13 22: 49 8b 84 24 88 0a 00 mov 0xa88(%r12),%rax 29: 00 2a:* 48 89 83 a0 02 00 00 mov %rax,0x2a0(%rbx) <-- trapping instruction 31: 49 c7 84 24 88 0a 00 movq $0x0,0xa88(%r12) 38: 00 00 00 00 00 3d: 4c 39 f3 cmp %r14,%rbx Code starting with the faulting instruction =========================================== 0: 48 89 83 a0 02 00 00 mov %rax,0x2a0(%rbx) 7: 49 c7 84 24 88 0a 00 movq $0x0,0xa88(%r12) e: 00 00 00 00 00 13: 4c 39 f3 cmp %r14,%rbx The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260206/202602061046.eee12820-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki