INFO: rcu_sched self-detected stall on CPU
	0-....: (124999 ticks this GP) idle=83e/1/4611686018427387906 softirq=303587/303703 fqs=31217 
	 (t=125000 jiffies g=145983 c=145982 q=753)
NMI backtrace for cpu 0
CPU: 0 PID: 27154 Comm: syz-executor4 Not tainted 4.17.0-rc7+ #73
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:is_loop_device drivers/block/loop.c:713 [inline]
RIP: 0010:loop_set_fd drivers/block/loop.c:901 [inline]
RIP: 0010:lo_ioctl+0x1b55/0x2130 drivers/block/loop.c:1398
RSP: 0018:ffff8801cf0ef948 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: 0000000000006000 RBX: ffff8801d28f4480 RCX: dffffc0000000000
RDX: 0000000000040000 RSI: ffffffff84b308e6 RDI: 0000000000006000
RBP: ffff8801cf0ef9c0 R08: ffff88018aa0a200 R09: ffff8801cf0ef518
R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
R13: ffff880184802818 R14: ffff8801b2c20460 R15: ffff8801b2c20380
 __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/0x16a0 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
RSP: 002b:00007f2f94ff6c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2f94ff76d4 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
INFO: rcu_bh self-detected stall on CPU
INFO: rcu_bh detected stalls on CPUs/tasks:
	0-....: (1 GPs behind) idle=83e/1/4611686018427387906 softirq=303701/303703 fqs=31171 
	 (t=125361 jiffies g=133 c=132 q=3)
	0-....: (1 GPs behind) idle=83e/1/4611686018427387906 softirq=303701/303703 fqs=31171 
	
NMI backtrace for cpu 0
CPU: 0 PID: 27154 Comm: syz-executor4 Not tainted 4.17.0-rc7+ #73
(detected by 1, t=125361 jiffies, g=133, c=132, q=3)
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:is_loop_device drivers/block/loop.c:713 [inline]
RIP: 0010:loop_set_fd drivers/block/loop.c:901 [inline]
RIP: 0010:lo_ioctl+0x1b55/0x2130 drivers/block/loop.c:1398
RSP: 0018:ffff8801cf0ef948 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: 0000000000006000 RBX: ffff8801d28f4480 RCX: dffffc0000000000
RDX: 0000000000040000 RSI: ffffffff84b308e6 RDI: 0000000000006000
RBP: ffff8801cf0ef9c0 R08: ffff88018aa0a200 R09: ffff8801cf0ef518
R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
R13: ffff880184802818 R14: ffff8801b2c20460 R15: ffff8801b2c20380
 __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/0x16a0 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
RSP: 002b:00007f2f94ff6c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2f94ff76d4 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
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 27154 Comm: syz-executor4 Not tainted 4.17.0-rc7+ #73
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rep_nop arch/x86/include/asm/processor.h:667 [inline]
RIP: 0010:cpu_relax arch/x86/include/asm/processor.h:672 [inline]
RIP: 0010:virt_spin_lock arch/x86/include/asm/qspinlock.h:69 [inline]
RIP: 0010:native_queued_spin_lock_slowpath+0x204/0xde0 kernel/locking/qspinlock.c:305
RSP: 0018:ffff8801dae070a0 EFLAGS: 00000002
RAX: 0000000000000000 RBX: ffffed003b5c0e2d RCX: 0000000000000004
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff88d90480
RBP: ffff8801dae07410 R08: fffffbfff11b2091 R09: fffffbfff11b2090
R10: fffffbfff11b2090 R11: ffffffff88d90483 R12: ffffffff88d90480
R13: ffff8801dae073e8 R14: 0000000000000001 R15: dffffc0000000000
FS:  00007f2f94ff7700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fb22000 CR3: 000000018e15e000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:674 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:30 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:90 [inline]
 do_raw_spin_lock+0x1a7/0x200 kernel/locking/spinlock_debug.c:113
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:117 [inline]
 _raw_spin_lock_irqsave+0x9e/0xc0 kernel/locking/spinlock.c:152
 print_cpu_stall kernel/rcu/tree.c:1527 [inline]
 check_cpu_stall.isra.61.cold.80+0x374/0x59a 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:is_loop_device drivers/block/loop.c:713 [inline]
RIP: 0010:loop_set_fd drivers/block/loop.c:901 [inline]
RIP: 0010:lo_ioctl+0x1b55/0x2130 drivers/block/loop.c:1398
RSP: 0018:ffff8801cf0ef948 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: 0000000000006000 RBX: ffff8801d28f4480 RCX: dffffc0000000000
RDX: 0000000000040000 RSI: ffffffff84b308e6 RDI: 0000000000006000
RBP: ffff8801cf0ef9c0 R08: ffff88018aa0a200 R09: ffff8801cf0ef518
R10: 0000000000000003 R11: 0000000000000001 R12: 0000000000000000
R13: ffff880184802818 R14: ffff8801b2c20460 R15: ffff8801b2c20380
 __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/0x16a0 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
RSP: 002b:00007f2f94ff6c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2f94ff76d4 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
Code: 5c 00 00 00 00 48 83 e7 f8 49 29 fc 41 8d 4c 24 64 c1 e9 03 f3 48 ab 48 81 c4 48 03 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 f3 90 <e9> 3b ff ff ff 89 f1 81 fe 00 01 00 00 0f 84 9e 03 00 00 41 be 
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.312 msecs