rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=502/1/0x4000000000000002 softirq=14449/14461 fqs=5250 
	(t=10502 jiffies g=11565 q=854)
NMI backtrace for cpu 0
CPU: 0 PID: 9749 Comm: syz-executor.4 Not tainted 5.4.0-rc7-next-20191113 #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:atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
RIP: 0010:irq_work_sync+0xd3/0x1d0 kernel/irq_work.c:193
Code: f5 ff 4d 89 e6 4d 89 e5 48 b8 00 00 00 00 00 fc ff df 49 c1 ee 03 41 83 e5 07 49 01 c6 41 83 c5 03 eb 07 e8 6f 8c f5 ff f3 90 <e8> 68 8c f5 ff be 04 00 00 00 4c 89 e7 e8 eb 8d 31 00 41 0f b6 06
RSP: 0018:ffff88805f2ef858 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffff88806bcbc200 RBX: 0000000000000002 RCX: ffffffff817e1f96
RDX: 0000000000000000 RSI: ffffffff817e1f61 RDI: 0000000000000005
RBP: ffff88805f2ef878 R08: ffff88806bcbc200 R09: ffffed10141c9681
R10: ffffed10141c9680 R11: ffff8880a0e4b403 R12: ffff8880a0e4b400
R13: 0000000000000003 R14: ffffed10141c9680 R15: ffff88805f2ef918
 _free_event+0x89/0x13b0 kernel/events/core.c:4569
 put_event+0x47/0x60 kernel/events/core.c:4694
 perf_event_release_kernel+0x6d5/0xd70 kernel/events/core.c:4809
 perf_release+0x37/0x50 kernel/events/core.c:4819
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x904/0x2e60 kernel/exit.c:817
 do_group_exit+0x135/0x360 kernel/exit.c:921
 get_signal+0x47c/0x24f0 kernel/signal.c:2734
 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:159
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a219
Code: Bad RIP value.
RSP: 002b:00007fb1b534ccf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000075c078 RCX: 000000000045a219
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075c078
RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075c07c
R13: 00007ffe8591178f R14: 00007fb1b534d9c0 R15: 000000000075c07c