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X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR11MB4965 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "WARNING:at_kernel/sched/sched.h:#update_load_avg" on: commit: 124c8f43740f3f1e3e2aeecd976bcf5ddd7bd435 ("sched/fair: Implement delayed dequeue") https://git.kernel.org/cgit/linux/kernel/git/peterz/queue.git sched/prep in testcase: boot compiler: clang-18 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (please refer to attached dmesg/kmsg for entire log/backtrace) we noticed the issue does not always happen, 60 times out of 150 runs as below. but the parent keeps clean. a1133ac6dc7c6bde 124c8f43740f3f1e3e2aeecd976 ---------------- --------------------------- fail:runs %reproduction fail:runs | | | :150 40% 60:150 dmesg.WARNING:at_kernel/sched/sched.h:#update_load_avg 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/202407291328.761441a7-oliver.sang@intel.com [ 13.522527][ C0] ------------[ cut here ]------------ [ 13.523046][ C0] rq->clock_update_flags < RQCF_ACT_SKIP [ 13.523055][ C0] WARNING: CPU: 0 PID: 158 at kernel/sched/sched.h:1550 update_load_avg (kernel/sched/sched.h:1550 kernel/sched/pelt.h:67 kernel/sched/pelt.h:174 kernel/sched/fair.c:4747) [ 13.524265][ C0] Modules linked in: drm fuse ip_tables [ 13.524722][ C0] CPU: 0 UID: 0 PID: 158 Comm: openipmi Not tainted 6.10.0-12745-g124c8f43740f #1 [ 13.525464][ C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 13.526307][ C0] RIP: 0010:update_load_avg (kernel/sched/sched.h:1550 kernel/sched/pelt.h:67 kernel/sched/pelt.h:174 kernel/sched/fair.c:4747) [ 13.526793][ C0] Code: 00 4c 2b bb 88 01 00 00 40 f6 c5 02 0f 84 b7 fa ff ff e9 ca fa ff ff c6 05 b9 1b e4 01 01 48 c7 c7 34 74 d6 a6 e8 a1 c7 fa ff <0f> 0b e9 78 fa ff ff 65 8b 0d 8f 83 91 5a 89 c9 48 0f a3 0d e9 7b All code ======== 0: 00 4c 2b bb add %cl,-0x45(%rbx,%rbp,1) 4: 88 01 mov %al,(%rcx) 6: 00 00 add %al,(%rax) 8: 40 f6 c5 02 test $0x2,%bpl c: 0f 84 b7 fa ff ff je 0xfffffffffffffac9 12: e9 ca fa ff ff jmpq 0xfffffffffffffae1 17: c6 05 b9 1b e4 01 01 movb $0x1,0x1e41bb9(%rip) # 0x1e41bd7 1e: 48 c7 c7 34 74 d6 a6 mov $0xffffffffa6d67434,%rdi 25: e8 a1 c7 fa ff callq 0xfffffffffffac7cb 2a:* 0f 0b ud2 <-- trapping instruction 2c: e9 78 fa ff ff jmpq 0xfffffffffffffaa9 31: 65 8b 0d 8f 83 91 5a mov %gs:0x5a91838f(%rip),%ecx # 0x5a9183c7 38: 89 c9 mov %ecx,%ecx 3a: 48 rex.W 3b: 0f .byte 0xf 3c: a3 .byte 0xa3 3d: 0d .byte 0xd 3e: e9 .byte 0xe9 3f: 7b .byte 0x7b Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: e9 78 fa ff ff jmpq 0xfffffffffffffa7f 7: 65 8b 0d 8f 83 91 5a mov %gs:0x5a91838f(%rip),%ecx # 0x5a91839d e: 89 c9 mov %ecx,%ecx 10: 48 rex.W 11: 0f .byte 0xf 12: a3 .byte 0xa3 13: 0d .byte 0xd 14: e9 .byte 0xe9 15: 7b .byte 0x7b [ 13.528234][ C0] RSP: 0000:ffffbaef40003d90 EFLAGS: 00010046 [ 13.528723][ C0] RAX: b53834d2850b7b00 RBX: ffff9ef2efd34640 RCX: 0000000000000027 [ 13.529379][ C0] RDX: 0000000000000002 RSI: 00000000ffff7fff RDI: ffff9ef2efc20b88 [ 13.530029][ C0] RBP: 0000000000000001 R08: 0000000000007fff R09: ffffffffa7053610 [ 13.530685][ C0] R10: 0000000000017ffd R11: 0000000000000004 R12: ffff9ef2efd345c0 [ 13.531344][ C0] R13: ffff9ef2efd34640 R14: ffff9eefc0e26400 R15: 0000000000000000 [ 13.532001][ C0] FS: 0000000000000000(0000) GS:ffff9ef2efc00000(0063) knlGS:00000000f7f5f180 [ 13.532720][ C0] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 13.533242][ C0] CR2: 00000000577c51ac CR3: 0000000162e6c000 CR4: 00000000000406f0 [ 13.533891][ C0] Call Trace: [ 13.534215][ C0] [ 13.534504][ C0] ? __warn (kernel/panic.c:240 kernel/panic.c:735) [ 13.534863][ C0] ? update_load_avg (kernel/sched/sched.h:1550 kernel/sched/pelt.h:67 kernel/sched/pelt.h:174 kernel/sched/fair.c:4747) [ 13.535278][ C0] ? report_bug (lib/bug.c:? lib/bug.c:219) [ 13.535695][ C0] ? handle_bug (arch/x86/kernel/traps.c:239) [ 13.536079][ C0] ? exc_invalid_op (arch/x86/kernel/traps.c:260) [ 13.536498][ C0] ? asm_exc_invalid_op (arch/x86/include/asm/idtentry.h:621) [ 13.536920][ C0] ? update_load_avg (kernel/sched/sched.h:1550 kernel/sched/pelt.h:67 kernel/sched/pelt.h:174 kernel/sched/fair.c:4747) [ 13.537334][ C0] dequeue_entity (kernel/sched/sched.h:817 kernel/sched/fair.c:5429) [ 13.537729][ C0] dequeue_entities (kernel/sched/fair.c:6972) [ 13.538130][ C0] unregister_fair_sched_group (kernel/sched/fair.c:379 kernel/sched/fair.c:13159) [ 13.554647][ C0] ? __pfx_sched_unregister_group_rcu (kernel/sched/core.c:8759) [ 13.555167][ C0] sched_unregister_group_rcu (kernel/sched/core.c:8707 kernel/sched/core.c:8761) [ 13.555621][ C0] rcu_do_batch (arch/x86/include/asm/preempt.h:26 kernel/rcu/tree.c:2576) [ 13.556008][ C0] rcu_core (kernel/rcu/tree.c:2845) [ 13.556373][ C0] handle_softirqs (arch/x86/include/asm/jump_label.h:27 include/linux/jump_label.h:207 include/trace/events/irq.h:142 kernel/softirq.c:555) [ 13.556775][ C0] __irq_exit_rcu (kernel/softirq.c:617 kernel/softirq.c:639) [ 13.557166][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) [ 13.557638][ C0] [ 13.557920][ C0] [ 13.560463][ C0] asm_sysvec_apic_timer_interrupt (arch/x86/include/asm/idtentry.h:702) [ 13.560957][ C0] RIP: 0010:irqentry_exit_to_user_mode (kernel/entry/common.c:? include/linux/entry-common.h:328 kernel/entry/common.c:231) [ 13.561465][ C0] Code: 90 41 57 41 56 53 48 89 fb e8 63 90 1f ff 65 4c 8b 34 25 40 37 03 00 49 8b 3e f7 c7 0e 30 02 00 74 7c 49 89 ff e8 97 8f 1f ff <4c> 89 f8 a8 08 75 38 a9 00 10 00 00 75 40 a9 00 20 00 00 75 4b a9 All code ======== 0: 90 nop 1: 41 57 push %r15 3: 41 56 push %r14 5: 53 push %rbx 6: 48 89 fb mov %rdi,%rbx 9: e8 63 90 1f ff callq 0xffffffffff1f9071 e: 65 4c 8b 34 25 40 37 mov %gs:0x33740,%r14 15: 03 00 17: 49 8b 3e mov (%r14),%rdi 1a: f7 c7 0e 30 02 00 test $0x2300e,%edi 20: 74 7c je 0x9e 22: 49 89 ff mov %rdi,%r15 25: e8 97 8f 1f ff callq 0xffffffffff1f8fc1 2a:* 4c 89 f8 mov %r15,%rax <-- trapping instruction 2d: a8 08 test $0x8,%al 2f: 75 38 jne 0x69 31: a9 00 10 00 00 test $0x1000,%eax 36: 75 40 jne 0x78 38: a9 00 20 00 00 test $0x2000,%eax 3d: 75 4b jne 0x8a 3f: a9 .byte 0xa9 Code starting with the faulting instruction =========================================== 0: 4c 89 f8 mov %r15,%rax 3: a8 08 test $0x8,%al 5: 75 38 jne 0x3f 7: a9 00 10 00 00 test $0x1000,%eax c: 75 40 jne 0x4e e: a9 00 20 00 00 test $0x2000,%eax 13: 75 4b jne 0x60 15: a9 .byte 0xa9 [ 13.562938][ C0] RSP: 0000:ffffbaef40613f38 EFLAGS: 00000202 [ 13.563444][ C0] RAX: ffff9ef0287dd080 RBX: ffffbaef40613f58 RCX: 000000000000080b [ 13.564125][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000008 [ 13.564796][ C0] RBP: 0000000000000000 R08: 000000000000002b R09: 000000000000002b [ 13.565456][ C0] R10: 0000000000000296 R11: 00000000ff8772ac R12: 0000000000000000 [ 13.566115][ C0] R13: 0000000000000000 R14: ffff9ef0287dd080 R15: 0000000020000008 [ 13.566782][ C0] ? irqentry_exit_to_user_mode (kernel/entry/common.c:? include/linux/entry-common.h:328 kernel/entry/common.c:231) [ 13.567254][ C0] asm_sysvec_reschedule_ipi (arch/x86/include/asm/idtentry.h:707) [ 13.567709][ C0] RIP: 0023:0x56652630 [ 13.568072][ C0] Code: ff ff 83 c4 10 85 c0 74 05 83 c4 08 5b c3 83 ec 0c 8d 83 8d 6b ff ff 50 e8 cd 7c ff ff 8d b4 26 00 00 00 00 8d b6 00 00 00 00 <55> 57 56 53 e8 e7 61 ff ff 81 c3 13 38 01 00 83 ec 0c 8b 44 24 20 All code ======== 0: ff (bad) 1: ff 83 c4 10 85 c0 incl -0x3f7aef3c(%rbx) 7: 74 05 je 0xe 9: 83 c4 08 add $0x8,%esp c: 5b pop %rbx d: c3 retq e: 83 ec 0c sub $0xc,%esp 11: 8d 83 8d 6b ff ff lea -0x9473(%rbx),%eax 17: 50 push %rax 18: e8 cd 7c ff ff callq 0xffffffffffff7cea 1d: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 24: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi 2a:* 55 push %rbp <-- trapping instruction 2b: 57 push %rdi 2c: 56 push %rsi 2d: 53 push %rbx 2e: e8 e7 61 ff ff callq 0xffffffffffff621a 33: 81 c3 13 38 01 00 add $0x13813,%ebx 39: 83 ec 0c sub $0xc,%esp 3c: 8b 44 24 20 mov 0x20(%rsp),%eax Code starting with the faulting instruction =========================================== 0: 55 push %rbp 1: 57 push %rdi 2: 56 push %rsi 3: 53 push %rbx 4: e8 e7 61 ff ff callq 0xffffffffffff61f0 9: 81 c3 13 38 01 00 add $0x13813,%ebx f: 83 ec 0c sub $0xc,%esp 12: 8b 44 24 20 mov 0x20(%rsp),%eax The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20240729/202407291328.761441a7-oliver.sang@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki