================================================================== BUG: KMSAN: uninit-value in accumulate_sum kernel/sched/fair.c:3131 [inline] BUG: KMSAN: uninit-value in ___update_load_sum kernel/sched/fair.c:3214 [inline] BUG: KMSAN: uninit-value in __update_load_avg_cfs_rq kernel/sched/fair.c:3320 [inline] BUG: KMSAN: uninit-value in update_cfs_rq_load_avg+0x1370/0x1aa0 kernel/sched/fair.c:3696 CPU: 0 PID: 4498 Comm: syz-executor4 Not tainted 4.17.0+ #9 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x185/0x1d0 lib/dump_stack.c:113 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:1125 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:620 accumulate_sum kernel/sched/fair.c:3131 [inline] ___update_load_sum kernel/sched/fair.c:3214 [inline] __update_load_avg_cfs_rq kernel/sched/fair.c:3320 [inline] update_cfs_rq_load_avg+0x1370/0x1aa0 kernel/sched/fair.c:3696 update_load_avg+0xe50/0x2cc0 kernel/sched/fair.c:3797 enqueue_task_fair+0x3c9a/0x4490 kernel/sched/fair.c:5381 enqueue_task kernel/sched/core.c:751 [inline] activate_task kernel/sched/core.c:770 [inline] ttwu_activate kernel/sched/core.c:1658 [inline] ttwu_do_activate kernel/sched/core.c:1717 [inline] ttwu_queue kernel/sched/core.c:1862 [inline] try_to_wake_up+0x162f/0x2260 kernel/sched/core.c:2075 wake_up_process+0x34/0x40 kernel/sched/core.c:2148 hrtimer_wakeup+0xac/0x100 kernel/time/hrtimer.c:1647 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0xc54/0x1630 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x451/0x13c0 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt+0x6b/0x250 arch/x86/kernel/apic/apic.c:1025 smp_apic_timer_interrupt+0x5a/0x90 arch/x86/kernel/apic/apic.c:1053 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:866 RIP: 0010:finish_lock_switch+0x38/0x50 kernel/sched/core.c:2626 RSP: 0018:ffff8801afe9fc20 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff88021f0dac40 RBX: 0000000000000080 RCX: ffff880000000000 RDX: ffff88021f0dbc40 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000 RBP: ffff8801afe9fc38 R08: 0000000001080020 R09: 0000000000000002 R10: ffffffff7fffffff R11: ffffffff813553c0 R12: ffff88021fc3ec40 R13: ffff8801d3a7c358 R14: 0000000000000000 R15: ffff88021f0dac40 finish_task_switch+0xde/0x270 kernel/sched/core.c:2725 context_switch kernel/sched/core.c:2883 [inline] __schedule+0x66b/0x770 kernel/sched/core.c:3524 schedule+0x1cc/0x2f0 kernel/sched/core.c:3568 freezable_schedule include/linux/freezer.h:172 [inline] do_nanosleep+0x2c3/0x9c0 kernel/time/hrtimer.c:1689 hrtimer_nanosleep kernel/time/hrtimer.c:1743 [inline] __do_sys_nanosleep kernel/time/hrtimer.c:1775 [inline] __se_sys_nanosleep+0x4b3/0x6a0 kernel/time/hrtimer.c:1762 __x64_sys_nanosleep+0x92/0xc0 kernel/time/hrtimer.c:1762 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4811a0 RSP: 002b:0000000000a3ea98 EFLAGS: 00000246 ORIG_RAX: 0000000000000023 RAX: ffffffffffffffda RBX: 0000000000172890 RCX: 00000000004811a0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000a3eaa0 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000fac940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000011 R13: 00000000000013c4 R14: 0000000000a3f160 R15: 000000000017282f Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:282 [inline] kmsan_save_stack mm/kmsan/kmsan.c:297 [inline] kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:689 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:464 update_load_add kernel/sched/fair.c:123 [inline] account_entity_enqueue kernel/sched/fair.c:2644 [inline] reweight_entity+0x1610/0x1a30 kernel/sched/fair.c:2794 update_cfs_group kernel/sched/fair.c:2991 [inline] dequeue_task_fair+0x2e12/0x3300 kernel/sched/fair.c:5442 dequeue_task kernel/sched/core.c:762 [inline] deactivate_task+0x560/0x7d0 kernel/sched/core.c:778 __schedule+0x164/0x770 kernel/sched/core.c:3474 do_task_dead+0xc8/0xf0 kernel/sched/core.c:3541 do_exit+0x347e/0x3930 kernel/exit.c:924 do_group_exit+0x1a0/0x360 kernel/exit.c:970 get_signal+0x1405/0x1ec0 kernel/signal.c:2482 do_signal+0xb8/0x1d20 arch/x86/kernel/signal.c:810 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline] prepare_exit_to_usermode+0x271/0x3a0 arch/x86/entry/common.c:196 syscall_return_slowpath+0xe9/0x710 arch/x86/entry/common.c:265 do_syscall_64+0x1ad/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:282 [inline] kmsan_save_stack mm/kmsan/kmsan.c:297 [inline] kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:689 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:464 update_load_set kernel/sched/fair.c:135 [inline] reweight_entity+0x128b/0x1a30 kernel/sched/fair.c:2780 update_cfs_group kernel/sched/fair.c:2991 [inline] dequeue_task_fair+0x2e12/0x3300 kernel/sched/fair.c:5442 dequeue_task kernel/sched/core.c:762 [inline] deactivate_task+0x560/0x7d0 kernel/sched/core.c:778 __schedule+0x164/0x770 kernel/sched/core.c:3474 do_task_dead+0xc8/0xf0 kernel/sched/core.c:3541 do_exit+0x347e/0x3930 kernel/exit.c:924 do_group_exit+0x1a0/0x360 kernel/exit.c:970 get_signal+0x1405/0x1ec0 kernel/signal.c:2482 do_signal+0xb8/0x1d20 arch/x86/kernel/signal.c:810 exit_to_usermode_loop arch/x86/entry/common.c:162 [inline] prepare_exit_to_usermode+0x271/0x3a0 arch/x86/entry/common.c:196 syscall_return_slowpath+0xe9/0x710 arch/x86/entry/common.c:265 do_syscall_64+0x1ad/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Local variable description: ----flags.i.i.i.i@_raw_spin_lock_irqsave Variable was created at: _raw_spin_lock_irqsave+0x45/0xf0 kernel/locking/spinlock.c:150 hrtimer_interrupt+0x107/0x13c0 kernel/time/hrtimer.c:1499 ==================================================================