rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=b3e/1/0x4000000000000002 softirq=60284/60284 fqs=5094 
	(t=10500 jiffies g=75533 q=1862)
NMI backtrace for cpu 0
CPU: 0 PID: 4355 Comm: syz-executor.4 Not tainted 5.5.0-rc3-syzkaller #0
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+0x197/0x210 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
 rcu_pending kernel/rcu/tree.c:2827 [inline]
 rcu_sched_clock_irq.cold+0x509/0xc02 kernel/rcu/tree.c:2271
 update_process_times+0x2d/0x70 kernel/time/timer.c:1726
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1310
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:__read_once_size include/linux/compiler.h:199 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:155 [inline]
RIP: 0010:write_comp_data+0x17/0x70 kernel/kcov.c:208
Code: c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 4c 8b 04 25 c0 1e 02 00 65 8b 05 38 f0 8c 7e a9 00 01 1f 00 75 51 <41> 8b 80 80 13 00 00 83 f8 03 75 45 49 8b 80 88 13 00 00 45 8b 80
RSP: 0000:ffffc90002637c30 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000080000003 RBX: 0000000000000003 RCX: ffffffff83933d3a
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffffc90002637c38 R08: ffff8880a78d2500 R09: ffffed1015d0703d
R10: ffffed1015d0703c R11: ffff8880ae8381e3 R12: 0000000000000000
R13: 00007f7f1fa3e5f0 R14: 0000000000000000 R15: ffffc90002637f58
 check_preemption_disabled lib/smp_processor_id.c:16 [inline]
 debug_smp_processor_id+0x2a/0x18a lib/smp_processor_id.c:57
 rcu_lockdep_current_cpu_online kernel/rcu/tree.c:970 [inline]
 rcu_lockdep_current_cpu_online+0x39/0x130 kernel/rcu/tree.c:961
 rcu_read_lock_held_common kernel/rcu/update.c:109 [inline]
 rcu_read_lock_held_common+0xbd/0x130 kernel/rcu/update.c:99
 rcu_read_lock_sched_held+0x5b/0xd0 kernel/rcu/update.c:120
 trace_x86_fpu_dropped arch/x86/include/asm/trace/fpu.h:72 [inline]
 fpu__drop+0x4b3/0x5a0 arch/x86/kernel/fpu/core.c:288
 fpu__clear+0x38/0x440 arch/x86/kernel/fpu/core.c:325
 handle_signal arch/x86/kernel/signal.c:766 [inline]
 do_signal+0x9d2/0x1700 arch/x86/kernel/signal.c:817
 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:160
 prepare_exit_to_usermode+0x321/0x3a0 arch/x86/entry/common.c:195
 ret_from_intr+0x26/0x36
RIP: 0033:0x402b00
Code: 01 49 83 c5 09 45 39 67 1c 7f ce 48 69 db e8 04 00 00 44 89 b3 04 05 a7 00 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f c3 66 90 <53> 48 8b 76 10 89 fb 64 8b 04 25 d0 ff ff ff 85 c0 74 3d 48 8d 86
RSP: 002b:00007f7f1fa3e4b8 EFLAGS: 00000206
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 0000000000414717
RDX: 00007f7f1fa3e4c0 RSI: 00007f7f1fa3e5f0 RDI: 000000000000000b
RBP: 000000000075bf20 R08: 00007f7f1fa3ea70 R09: 000000000075bf20
R10: 0000000000000000 R11: 0000000000000000 R12: 00007f7f1fa3f6d4
R13: 00000000004cae63 R14: 00000000004e44b0 R15: 00000000ffffffff