rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...0: (1 GPs behind) idle=a2a/1/0x4000000000000000 softirq=7748/7749 fqs=5250 
	(detected by 1, t=10502 jiffies, g=8425, q=3617)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6805 Comm: syz-executor501 Not tainted 5.8.0-rc4-next-20200710-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline]
RIP: 0010:hlock_class kernel/locking/lockdep.c:179 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4054 [inline]
RIP: 0010:__lock_acquire+0x3f7/0x56e0 kernel/locking/lockdep.c:4330
Code: 38 d0 7c 08 84 d2 0f 85 c3 10 00 00 8b 84 24 40 01 00 00 89 45 24 4c 8b 6c 24 08 be 08 00 00 00 41 81 e5 ff 1f 00 00 4c 89 e8 <48> c1 f8 06 48 8d 3c c5 e0 09 5b 8c e8 48 8b 59 00 4c 0f a3 2d c0
RSP: 0018:ffffc90000007b90 EFLAGS: 00000006
RAX: 0000000000000053 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88809608acfc
RBP: ffff88809608acd8 R08: 0000000000000001 R09: 00000000000c4053
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88809608a400
R13: 0000000000000053 R14: ffff8880ae627758 R15: 0000000000044000
FS:  00000000016b3880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000610 CR3: 00000000a428c000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:4959
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
 _raw_spin_lock_irq+0x5b/0x80 kernel/locking/spinlock.c:167
 __run_hrtimer kernel/time/hrtimer.c:1524 [inline]
 __hrtimer_run_queues+0x252/0xfc0 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1079 [inline]
 __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1096
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 sysvec_apic_timer_interrupt+0xe0/0x120 arch/x86/kernel/apic/apic.c:1090
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:765 [inline]
RIP: 0010:on_each_cpu+0x149/0x240 kernel/smp.c:835
Code: 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 e6 00 00 00 48 83 3d 77 ff 4b 08 00 0f 84 af 00 00 00 e8 5c ef 0a 00 48 89 df 57 9d <0f> 1f 44 00 00 e8 4d ef 0a 00 bf 01 00 00 00 e8 03 86 e6 ff 31 ff
RSP: 0018:ffffc900018e7d70 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000293 RCX: 0000000000000000
RDX: ffff88809608a400 RSI: ffffffff816900d4 RDI: 0000000000000293
RBP: 0000000000000200 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffc900018e7ed0 R15: ffffffffa0f6839a
 clock_was_set+0x18/0x20 kernel/time/hrtimer.c:872
 do_settimeofday64 kernel/time/timekeeping.c:1257 [inline]
 do_settimeofday64+0x350/0x4e0 kernel/time/timekeeping.c:1223
 do_sys_settimeofday64 kernel/time/time.c:195 [inline]
 do_sys_settimeofday64+0x1de/0x260 kernel/time/time.c:169
 __do_sys_clock_settime kernel/time/posix-timers.c:1079 [inline]
 __se_sys_clock_settime kernel/time/posix-timers.c:1067 [inline]
 __x64_sys_clock_settime+0x197/0x260 kernel/time/posix-timers.c:1067
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x443849
Code: Bad RIP value.
RSP: 002b:00007ffe0850e448 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443849
RDX: 0000000000443849 RSI: 0000000020000400 RDI: 0000000000000000
RBP: 00007ffe0850e450 R08: 0000000001bbbbbb R09: 0000000001bbbbbb
R10: 0000000001bbbbbb R11: 0000000000000246 R12: 00007ffe0850e460
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs