rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 0, t=10502 jiffies, g=11629, q=137)
rcu: All QSes seen, last rcu_preempt kthread activity 10498 (4294982231-4294971733), jiffies_till_next_fqs=1, root ->qsmask 0x0
syz-executor.1  R  running task    27552  9766   9508 0x00000000
Call Trace:
 <IRQ>
 sched_show_task kernel/sched/core.c:5950 [inline]
 sched_show_task.cold+0x2e2/0x343 kernel/sched/core.c:5925
 print_other_cpu_stall kernel/rcu/tree_stall.h:430 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:558 [inline]
 rcu_pending kernel/rcu/tree.c:3237 [inline]
 rcu_sched_clock_irq.cold+0xba1/0xcfa kernel/rcu/tree.c:2308
 update_process_times+0x25/0x60 kernel/time/timer.c:1727
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:171
 tick_sched_timer+0x4e/0x140 kernel/time/tick-sched.c:1314
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x32c/0xdd0 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline]
 smp_apic_timer_interrupt+0x15b/0x600 arch/x86/kernel/apic/apic.c:1144
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:copy_xregs_to_user arch/x86/include/asm/fpu/internal.h:369 [inline]
RIP: 0010:copy_fpregs_to_sigframe arch/x86/kernel/fpu/signal.c:132 [inline]
RIP: 0010:copy_fpstate_to_sigframe+0x271/0xb40 arch/x86/kernel/fpu/signal.c:193
Code: 48 89 c3 89 c6 e8 ef 72 48 00 85 db 0f 85 e7 04 00 00 e8 72 71 48 00 0f 1f 00 bd ff ff ff ff 4c 89 ff 89 e8 89 ea 48 0f ae 27 <31> ed 0f 1f 00 e8 55 71 48 00 31 ff 89 ee e8 bc 72 48 00 85 ed 0f
RSP: 0000:ffffc900016d7c08 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 00000000ffffffff RBX: 0000000000000000 RCX: ffffc9000461a000
RDX: 00000000ffffffff RSI: ffffffff812a240e RDI: 00007f955bcc1600
RBP: 00000000ffffffff R08: ffff888048a38300 R09: ffffed1009147061
R10: ffffed1009147060 R11: ffff888048a38307 R12: dffffc0000000000
R13: 00000000000001b8 R14: ffff888048a38300 R15: 00007f955bcc1600
 get_sigframe.isra.0.constprop.0+0x47f/0x730 arch/x86/kernel/signal.c:279
 __setup_rt_frame arch/x86/kernel/signal.c:462 [inline]
 setup_rt_frame arch/x86/kernel/signal.c:704 [inline]
 handle_signal arch/x86/kernel/signal.c:748 [inline]
 do_signal+0xa69/0x13f0 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x26c/0x360 arch/x86/entry/common.c:161
 prepare_exit_to_usermode+0x305/0x380 arch/x86/entry/common.c:196
 ret_from_intr+0x26/0x36
RIP: 0033:0x4044f9
Code: d0 ff ff ff 01 48 8b 7c 24 20 c7 44 24 2c 00 00 00 00 e8 ca 01 02 00 85 c0 75 23 48 6b 44 24 18 18 8b 7c 24 28 48 03 44 24 30 <48> 8b 48 10 48 8b 50 08 48 8b 30 e8 67 1d 01 00 89 44 24 2c 64 f0
RSP: 002b:00007f955bcc19e0 EFLAGS: 00010202
RAX: 00000000263d5298 RBX: 00007f955bcc26d4 RCX: 00000000004162a7
RDX: c97f6d153e4cee93 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 000000000076bf20 R08: 00007f955bcc19e0 R09: 000000000076bf20
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff
R13: 0000000000000c1c R14: 00000000004c13cb R15: 000000000076bf2c
rcu: rcu_preempt kthread starved for 10498 jiffies! g11629 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29112    10      2 0x80004000
Call Trace:
 schedule+0xd0/0x2a0 kernel/sched/core.c:4152
 schedule_timeout+0x36b/0x860 kernel/time/timer.c:1898
 rcu_gp_fqs_loop kernel/rcu/tree.c:1680 [inline]
 rcu_gp_kthread+0xc7a/0x1a10 kernel/rcu/tree.c:1848
 kthread+0x357/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352