==================================================================
BUG: KMSAN: uninit-value in __list_add_valid+0x1a2/0x450 lib/list_debug.c:23
CPU: 1 PID: 4587 Comm: syz-executor4 Not tainted 4.17.0+ #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __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:1465
 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:650
 __list_add_valid+0x1a2/0x450 lib/list_debug.c:23
 __list_add include/linux/list.h:60 [inline]
 list_add include/linux/list.h:79 [inline]
 account_entity_enqueue kernel/sched/fair.c:2652 [inline]
 enqueue_entity kernel/sched/fair.c:4176 [inline]
 enqueue_task_fair+0xe12/0x4490 kernel/sched/fair.c:5359
 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
 swake_up_locked kernel/sched/swait.c:30 [inline]
 swake_up+0xfb/0x3b0 kernel/sched/swait.c:40
 rcu_gp_kthread_wake kernel/rcu/tree.c:1787 [inline]
 rcu_report_qs_rsp kernel/rcu/tree.c:2366 [inline]
 rcu_report_qs_rnp+0x767/0x880 kernel/rcu/tree.c:2433
 rcu_report_qs_rdp kernel/rcu/tree.c:2516 [inline]
 rcu_check_quiescent_state kernel/rcu/tree.c:2553 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2881 [inline]
 rcu_process_callbacks+0x90a/0x2060 kernel/rcu/tree.c:2914
 __do_softirq+0x592/0x979 kernel/softirq.c:285
 invoke_softirq kernel/softirq.c:366 [inline]
 irq_exit+0x207/0x240 kernel/softirq.c:407
 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:525
 smp_apic_timer_interrupt+0x64/0x90 arch/x86/kernel/apic/apic.c:1055
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:868
 </IRQ>
RIP: 0010:finish_lock_switch+0x38/0x50 kernel/sched/core.c:2626
RSP: 0018:ffff88014202fc20 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff88021f3d0ac0 RBX: 0000000000000000 RCX: ffff88021f3d1ac0
RDX: ffff88021f3d1ac0 RSI: aaaaaaaaaaaab000 RDI: ffffea000cbf2560
RBP: ffff88014202fc38 R08: 0000000001080020 R09: 0000000000000002
R10: ffffffff7fffffff R11: ffffffff813553c0 R12: ffff88021fdb9ac0
R13: ffff880143e2a618 R14: 0000000000000000 R15: ffff88021f3d0ac0
 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+0x63/0xe7
RIP: 0033:0x4811c0
RSP: 002b:0000000000a3ea98 EFLAGS: 00000246 ORIG_RAX: 0000000000000023
RAX: ffffffffffffffda RBX: 00000000000a4569 RCX: 00000000004811c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000a3eaa0
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000ba3940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00000000000009fe R14: 0000000000a3f160 R15: 00000000000a4531

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:312 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:327 [inline]
 kmsan_internal_chain_origin+0x12b/0x210 mm/kmsan/kmsan.c:717
 __msan_chain_origin+0x69/0xc0 mm/kmsan/kmsan_instr.c:494
 __write_once_size include/linux/compiler.h:224 [inline]
 __list_add include/linux/list.h:66 [inline]
 list_add include/linux/list.h:79 [inline]
 account_entity_enqueue kernel/sched/fair.c:2652 [inline]
 enqueue_entity kernel/sched/fair.c:4176 [inline]
 enqueue_task_fair+0x2947/0x4490 kernel/sched/fair.c:5359
 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

Local variable description: ----t.i.i@__se_sys_nanosleep
Variable was created at:
 __se_sys_nanosleep+0x5f/0x6a0 kernel/time/hrtimer.c:1762
 __x64_sys_nanosleep+0x92/0xc0 kernel/time/hrtimer.c:1762
==================================================================