rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=dbe/1/0x4000000000000000 softirq=41300/41300 fqs=51 
	(detected by 1, t=10502 jiffies, g=72133, q=417)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 21513 Comm: syz-executor.1 Not tainted 5.9.0-rc2-next-20200824-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__kasan_check_read+0x0/0x10 mm/kasan/common.c:71
Code: 6b 89 e8 67 fa 08 00 48 8b 73 58 89 c2 48 c7 c7 a8 fc 6b 89 f7 da e8 c7 32 a9 ff e9 d1 f5 ff ff cc cc cc cc cc cc cc cc cc cc <48> 8b 0c 24 89 f6 31 d2 e9 e3 29 00 00 0f 1f 00 48 8b 0c 24 89 f6
RSP: 0018:ffffc90000007d40 EFLAGS: 00000046
RAX: 0000000000000007 RBX: ffff8880a86a0b40 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880a86a0ae8
RBP: ffff8880a86a0ae8 R08: 0000000000000001 R09: ffff88804c7769a8
R10: fffffbfff1577319 R11: 0000000000000000 R12: ffff888092cb3380
R13: 1741adea2e835bd4 R14: ffff888092cb33a0 R15: 1741adea2e835bd4
FS:  00007fab35504700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560c8255b158 CR3: 000000004858e000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 atomic_read include/asm-generic/atomic-instrumented.h:27 [inline]
 queued_spin_is_locked include/asm-generic/qspinlock.h:28 [inline]
 debug_spin_unlock kernel/locking/spinlock_debug.c:98 [inline]
 do_raw_spin_unlock+0x50/0x230 kernel/locking/spinlock_debug.c:138
 __raw_spin_unlock include/linux/spinlock_api_smp.h:151 [inline]
 _raw_spin_unlock+0x1a/0x40 kernel/locking/spinlock.c:183
 spin_unlock include/linux/spinlock.h:394 [inline]
 advance_sched+0x469/0x990 net/sched/sch_taprio.c:748
 __run_hrtimer kernel/time/hrtimer.c:1524 [inline]
 __hrtimer_run_queues+0x6a9/0xfc0 kernel/time/hrtimer.c:1588
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1650
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097
 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+0xb2/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:653 [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 0f c6 4c 08 00 0f 84 af 00 00 00 e8 1c fa 0a 00 48 89 df 57 9d <0f> 1f 44 00 00 e8 0d fa 0a 00 bf 01 00 00 00 e8 a3 34 e6 ff 31 ff
RSP: 0018:ffffc90015b8fb70 EFLAGS: 00000216
RAX: 000000000000022a RBX: 0000000000000216 RCX: ffffc9000aaa0000
RDX: 0000000000040000 RSI: ffffffff816978c4 RDI: 0000000000000216
RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0029a958dd51ce2c R14: 003b9aca00000000 R15: 0000000000000000
 clock_was_set+0x18/0x20 kernel/time/hrtimer.c:876
 timekeeping_inject_offset+0x436/0x570 kernel/time/timekeeping.c:1308
 do_adjtimex+0x28f/0xa30 kernel/time/timekeeping.c:2335
 do_clock_adjtime kernel/time/posix-timers.c:1109 [inline]
 __do_sys_clock_adjtime+0x155/0x250 kernel/time/posix-timers.c:1121
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d579
Code: 5d b4 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fab35503c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 0000000000001e00 RCX: 000000000045d579
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000000
RBP: 000000000118cf78 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007fff7559abaf R14: 00007fab355049c0 R15: 000000000118cf4c
rcu: rcu_preempt kthread starved for 10400 jiffies! g72133 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:29080 pid:   10 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3778 [inline]
 __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527
 schedule+0xd0/0x2a0 kernel/sched/core.c:4602
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1879
 rcu_gp_fqs_loop kernel/rcu/tree.c:1923 [inline]
 rcu_gp_kthread+0xae5/0x1b50 kernel/rcu/tree.c:2097
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294