INFO: rcu_sched self-detected stall on CPU
	0-....: (124998 ticks this GP) idle=d16/1/4611686018427387906 softirq=78763/78763 fqs=31216 
	 (t=125000 jiffies g=41398 c=41397 q=1313)
NMI backtrace for cpu 0
CPU: 0 PID: 18595 Comm: syz-executor3 Not tainted 4.17.0-rc7+ #103
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+0x1b9/0x294 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103
 nmi_trigger_cpumask_backtrace+0x151/0x192 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:156 [inline]
 rcu_dump_cpu_stacks+0x175/0x1c2 kernel/rcu/tree.c:1376
 print_cpu_stall kernel/rcu/tree.c:1525 [inline]
 check_cpu_stall.isra.61.cold.80+0x36c/0x59a kernel/rcu/tree.c:1593
 __rcu_pending kernel/rcu/tree.c:3356 [inline]
 rcu_pending kernel/rcu/tree.c:3401 [inline]
 rcu_check_callbacks+0x21b/0xad0 kernel/rcu/tree.c:2763
 update_process_times+0x2d/0x70 kernel/time/timer.c:1636
 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164
 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0x3e3/0x10a0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
 smp_apic_timer_interrupt+0x15d/0x710 arch/x86/kernel/apic/apic.c:1050
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863
 </IRQ>
RIP: 0010:__write_once_size include/linux/compiler.h:215 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4b/0x50 kernel/kcov.c:109
RSP: 0018:ffff8801d8ee7bf8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000040000 RBX: ffff8801d2873b40 RCX: ffffc90008ee4000
RDX: 0000000000040000 RSI: ffffffff84b309fb RDI: ffff8801b71ace20
RBP: ffff8801d8ee7bf8 R08: ffff8801b31f03c0 R09: ffffed003b5c46d2
R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8801b71ac900 R14: ffff8801b7040720 R15: ffff8801b7040640
 loop_set_fd drivers/block/loop.c:907 [inline]
 lo_ioctl+0x1bfb/0x2130 drivers/block/loop.c:1398
 lo_compat_ioctl+0xc1/0x170 drivers/block/loop.c:1603
 compat_blkdev_ioctl+0x3c2/0x1b20 block/compat_ioctl.c:406
 __do_compat_sys_ioctl fs/compat_ioctl.c:1461 [inline]
 __se_compat_sys_ioctl fs/compat_ioctl.c:1407 [inline]
 __ia32_compat_sys_ioctl+0x221/0x640 fs/compat_ioctl.c:1407
 do_syscall_32_irqs_on arch/x86/entry/common.c:323 [inline]
 do_fast_syscall_32+0x345/0xf9b arch/x86/entry/common.c:394
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7fbacb9
RSP: 002b:00000000f5fb60ac EFLAGS: 00000282 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 0000000000004c00
RDX: 0000000000000013 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000