syzbot

==================================================================
BUG: KMSAN: uninit-value in post_init_entity_util_avg+0x849/0x990 kernel/sched/fair.c:759
CPU: 0 PID: 6581 Comm: udevd Not tainted 4.17.0-rc5+ #102
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+0x149/0x260 mm/kmsan/kmsan.c:1084
 __msan_warning_32+0x6e/0xc0 mm/kmsan/kmsan_instr.c:686
 post_init_entity_util_avg+0x849/0x990 kernel/sched/fair.c:759
 wake_up_new_task+0x9c9/0x16f0 kernel/sched/core.c:2448
 _do_fork+0x765/0xf00 kernel/fork.c:2114
 __do_sys_clone kernel/fork.c:2196 [inline]
 __se_sys_clone kernel/fork.c:2190 [inline]
 __x64_sys_clone+0x15e/0x1b0 kernel/fork.c:2190
 do_syscall_64+0x152/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7ff6a0c2cf46
RSP: 002b:00007ffe39574320 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffe39574320 RCX: 00007ff6a0c2cf46
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffe39574380 R08: 00000000000019b5 R09: 00000000000019b5
R10: 00007ff6a1549a70 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe39574340 R14: 0000000000000005 R15: 0000000000000005

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:279 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:294 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:685
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:529
 enqueue_load_avg kernel/sched/fair.c:2746 [inline]
 reweight_entity+0x136b/0x1a30 kernel/sched/fair.c:2792
 update_cfs_group kernel/sched/fair.c:2991 [inline]
 entity_tick kernel/sched/fair.c:4464 [inline]
 task_tick_fair+0x5f8/0x1050 kernel/sched/fair.c:9893
 scheduler_tick+0x288/0x480 kernel/sched/core.c:3088
 update_process_times+0x157/0x1a0 kernel/time/timer.c:1641
 tick_sched_handle kernel/time/tick-sched.c:164 [inline]
 tick_sched_timer+0x3ba/0x520 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0xc03/0x15d0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x451/0x13c0 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt+0x66/0x230 arch/x86/kernel/apic/apic.c:1025
 smp_apic_timer_interrupt+0x5a/0x90 arch/x86/kernel/apic/apic.c:1053
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
==================================================================