INFO: rcu_sched self-detected stall on CPU
	0-....: (124999 ticks this GP) idle=ca2/1/4611686018427387906 softirq=46782/46782 fqs=31191 
	 (t=125000 jiffies g=25185 c=25184 q=725)
NMI backtrace for cpu 0
CPU: 0 PID: 13058 Comm: syz-executor6 Not tainted 4.17.0+ #87
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:1336
 print_cpu_stall kernel/rcu/tree.c:1485 [inline]
 check_cpu_stall.isra.60.cold.78+0x36c/0x5a6 kernel/rcu/tree.c:1553
 __rcu_pending kernel/rcu/tree.c:3244 [inline]
 rcu_pending kernel/rcu/tree.c:3291 [inline]
 rcu_check_callbacks+0x237/0xcb0 kernel/rcu/tree.c:2646
 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:loop_set_fd drivers/block/loop.c:902 [inline]
RIP: 0010:lo_ioctl+0x1b3a/0x2190 drivers/block/loop.c:1399
Code: 00 4d 8b ad f0 00 00 00 48 b9 00 00 00 00 00 fc ff df 49 8d bd b8 01 00 00 48 89 f8 48 c1 e8 03 80 3c 08 00 0f 85 ab 04 00 00 <4d> 8b ad b8 01 00 00 48 b9 00 00 00 00 00 fc ff df 4c 89 e8 48 c1 
RSP: 0018:ffff88018632f948 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff10039147b2f RBX: ffff8801d28de900 RCX: dffffc0000000000
RDX: 0000000000040000 RSI: ffffffff84b6784f RDI: ffff8801c8a3d978
RBP: ffff88018632f9c0 R08: ffff8801aab28740 R09: ffffed003b5c46d6
R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8801c8a3d7c0 R14: ffff8801b2c7f860 R15: ffff8801b2c7f780
 __blkdev_driver_ioctl block/ioctl.c:303 [inline]
 blkdev_ioctl+0x9b6/0x2020 block/ioctl.c:601
 block_ioctl+0xee/0x130 fs/block_dev.c:1877
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x1cf/0x16f0 fs/ioctl.c:684
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455a09
Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007fd33f190c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd33f1916d4 RCX: 0000000000455a09
RDX: 0000000000000013 RSI: 0000000000004c00 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000002de R14: 00000000006f9570 R15: 0000000000000000