rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 1, t=10502 jiffies, g=170729, q=61)
rcu: All QSes seen, last rcu_preempt kthread activity 10501 (4295075555-4295065054), jiffies_till_next_fqs=1, root ->qsmask 0x0
syz-executor.3  R  running task    28488  7855   9046 0x00000000
Call Trace:
 <IRQ>
 sched_show_task kernel/sched/core.c:5338 [inline]
 sched_show_task.cold+0x291/0x2fc kernel/sched/core.c:5313
 print_other_cpu_stall kernel/rcu/tree_stall.h:410 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:536 [inline]
 rcu_pending kernel/rcu/tree.c:2625 [inline]
 rcu_sched_clock_irq.cold+0xaaf/0xbfd kernel/rcu/tree.c:2161
 update_process_times+0x32/0x80 kernel/time/timer.c:1639
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161
 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1284
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x33e/0xde0 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
 smp_apic_timer_interrupt+0x120/0x570 arch/x86/kernel/apic/apic.c:1060
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:write_comp_data+0x1e/0x70 kernel/kcov.c:123
Code: 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 4c 8b 04 25 00 ee 01 00 65 8b 05 40 64 91 7e a9 00 01 1f 00 75 51 41 8b 80 e0 12 00 00 <83> f8 03 75 45 49 8b 80 e8 12 00 00 45 8b 80 e4 12 00 00 4c 8b 08
RSP: 0018:ffff888068a1fbe8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000002 RBX: 0000000000000001 RCX: ffffffff8165ad7f
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffff888068a1fc08 R08: ffff8880626ea080 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff876d1000
R13: 000000000000000c R14: 0000000000000080 R15: 0000000000000000
 do_futex+0x26f/0x1df0 kernel/futex.c:3599
 __do_sys_futex kernel/futex.c:3665 [inline]
 __se_sys_futex kernel/futex.c:3633 [inline]
 __x64_sys_futex+0x3f7/0x590 kernel/futex.c:3633
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45b89f
Code: 89 d8 83 e0 0c 83 f8 04 74 01 c3 64 48 8b 3c 25 00 00 00 00 b8 ca 00 00 00 4d 31 d2 48 81 c7 08 03 00 00 be 80 00 00 00 0f 05 <64> 8b 04 25 08 03 00 00 eb ce 0f 1f 80 00 00 00 00 48 83 ec 08 48
RSP: 002b:00007fb2cb03a168 EFLAGS: 00000202 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fb2cb03a2e0 RCX: 000000000045b89f
RDX: 000000000000000b RSI: 0000000000000080 RDI: 00007fb2cb03aa08
RBP: 0000000000000010 R08: 00000000004f1c80 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000020
R13: 0000000000000003 R14: 00007fb2cb03a1d0 R15: 0000000000000002
rcu: rcu_preempt kthread starved for 10535 jiffies! g170729 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29240    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2877 [inline]
 __schedule+0x817/0x1cc0 kernel/sched/core.c:3518
 schedule+0x92/0x180 kernel/sched/core.c:3562
 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1807
 rcu_gp_fqs_loop kernel/rcu/tree.c:1589 [inline]
 rcu_gp_kthread+0x9b2/0x18b0 kernel/rcu/tree.c:1746
 kthread+0x357/0x430 kernel/kthread.c:254
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352