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3081e5e2-64c7-42a5-96d7-08deb64a3278 X-MS-Exchange-CrossTenant-AuthSource: PH0PR11MB5832.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 May 2026 08:31:32.4783 (UTC) 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: dPSuoKfYnRSDf0Gd2eL1aYsOrtckh6diViFdMdECeAbuODNkd+V4y//vu7lMMfOjiMz4D7PmiUiGpI6OEMNZMg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR11MB7253 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "Oops:divide_error:#[##]" on: commit: d464c12d2d0562f4cc32bd0e62fad20f0d87e9ff ("sched/eevdf: Move to a single runqueue") https://git.kernel.org/cgit/linux/kernel/git/peterz/queue.git sched/flat in testcase: boot config: x86_64-randconfig-005-20260514 compiler: clang-20 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G (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/202605201620.d44e2cd6-lkp@intel.com [ 16.137634][ T102] Oops: divide error: 0000 [#1] [ 16.139003][ T102] CPU: 0 UID: 0 PID: 102 Comm: udevd Tainted: G T 7.1.0-rc2+ #1 PREEMPT [ 16.142054][ T102] Tainted: [T]=RANDSTRUCT [ 16.143709][ T102] RIP: 0010:update_protect_slice (kbuild/src/kernel/sched/fair.c:290 kbuild/src/kernel/sched/fair.c:300 kbuild/src/kernel/sched/fair.c:1070) [ 16.145953][ T102] Code: 49 48 48 39 c8 48 0f 43 c1 48 8b 8e 98 00 00 00 4c 8b 46 10 48 8b be 88 00 00 00 49 81 f8 00 00 10 00 74 09 48 c1 e0 14 31 d2 <49> f7 f0 48 01 f8 48 39 c8 48 0f 49 c1 48 89 86 98 00 00 00 c3 cc All code ======== 0: 49 rex.WB 1: 48 rex.W 2: 48 39 c8 cmp %rcx,%rax 5: 48 0f 43 c1 cmovae %rcx,%rax 9: 48 8b 8e 98 00 00 00 mov 0x98(%rsi),%rcx 10: 4c 8b 46 10 mov 0x10(%rsi),%r8 14: 48 8b be 88 00 00 00 mov 0x88(%rsi),%rdi 1b: 49 81 f8 00 00 10 00 cmp $0x100000,%r8 22: 74 09 je 0x2d 24: 48 c1 e0 14 shl $0x14,%rax 28: 31 d2 xor %edx,%edx 2a:* 49 f7 f0 div %r8 <-- trapping instruction 2d: 48 01 f8 add %rdi,%rax 30: 48 39 c8 cmp %rcx,%rax 33: 48 0f 49 c1 cmovns %rcx,%rax 37: 48 89 86 98 00 00 00 mov %rax,0x98(%rsi) 3e: c3 ret 3f: cc int3 Code starting with the faulting instruction =========================================== 0: 49 f7 f0 div %r8 3: 48 01 f8 add %rdi,%rax 6: 48 39 c8 cmp %rcx,%rax 9: 48 0f 49 c1 cmovns %rcx,%rax d: 48 89 86 98 00 00 00 mov %rax,0x98(%rsi) 14: c3 ret 15: cc int3 [ 16.153728][ T102] RSP: 0000:ffff888130197c10 EFLAGS: 00010046 [ 16.156049][ T102] RAX: 000000aae6000000 RBX: ffffffff836824c0 RCX: 0000000000000000 [ 16.159060][ T102] RDX: 0000000000000000 RSI: ffffffff83628140 RDI: 0000000000000000 [ 16.161885][ T102] RBP: ffff888130197c30 R08: 0000000000000000 R09: 0000000369497ec6 [ 16.163874][ T102] R10: 0000000000000000 R11: ffffffff813a0700 R12: ffffffff83682520 [ 16.165864][ T102] R13: 0000000000004261 R14: ffff88812ffaa000 R15: ffffffff83626cc0 [ 16.167651][ T102] FS: 0000000000000000(0000) GS:0000000000000000(0063) knlGS:00000000f7cb9740 [ 16.169702][ T102] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 16.171179][ T102] CR2: 00000000f7c3700c CR3: 0000000130150000 CR4: 00000000000406b0 [ 16.173009][ T102] Call Trace: [ 16.173803][ T102] [ 16.174479][ T102] wakeup_preempt (kbuild/src/kernel/sched/core.c:2256) [ 16.175457][ T102] attach_one_task (kbuild/src/kernel/sched/sched.h:3027) [ 16.176470][ T102] find_proxy_task (kbuild/src/kernel/sched/core.c:6800) [ 16.177605][ T102] __schedule (kbuild/src/kernel/sched/core.c:7108) The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260520/202605201620.d44e2cd6-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki