rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=ed6/1/0x4000000000000000 softirq=15015/15015 fqs=3 
	(detected by 1, t=10502 jiffies, g=21361, q=96)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 10091 Comm: syz-executor.1 Not tainted 5.9.0-rc3-next-20200903-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:lock_release+0x4bf/0x8f0 kernel/locking/lockdep.c:5030
Code: 01 00 00 48 8b 3c 24 57 9d 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c5 48 c7 45 00 00 00 00 00 c7 45 08 00 00 00 00 <48> 8b 84 24 88 00 00 00 65 48 2b 04 25 28 00 00 00 0f 85 75 03 00
RSP: 0018:ffffc90000007cb0 EFLAGS: 00000082
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff89c67500 RDI: 0000000000000086
RBP: fffff52000000f98 R08: 0000000000000001 R09: ffff88809a9a8c48
R10: fffffbfff15796c1 R11: 0000000000000000 R12: ffff88809a9a8340
R13: 0000000000000000 R14: ffffffff8671e86b R15: ffff88809a9a8340
FS:  00007f13c08b1700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32523000 CR3: 000000008e8b0000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_lock_release include/linux/rcupdate.h:253 [inline]
 rcu_read_unlock include/linux/rcupdate.h:695 [inline]
 advance_sched+0x56d/0x990 net/sched/sch_taprio.c:754
 __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:770 [inline]
RIP: 0010:on_each_cpu+0x143/0x1f0 kernel/smp.c:835
Code: 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 aa 00 00 00 48 83 3d 71 60 4c 08 00 74 6b e8 a2 08 0b 00 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 ae e6 e5 ff 31 ff 65 8b 1d 05 24
RSP: 0018:ffffc9000729fb68 EFLAGS: 00000216
RAX: 0000000000000464 RBX: 0000000000000216 RCX: ffffc9000a80d000
RDX: 0000000000040000 RSI: ffffffff8169da5e RDI: 0000000000000216
RBP: ffffffff8164eb70 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000200 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: 0033:0x45d5b9
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:00007f13c08b0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 0000000000001e00 RCX: 000000000045d5b9
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 000000000118cf78 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007fffedb78e9f R14: 00007f13c08b19c0 R15: 000000000118cf4c
rcu: rcu_preempt kthread starved for 10496 jiffies! g21361 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:29216 pid:   10 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3777 [inline]
 __schedule+0xea9/0x2230 kernel/sched/core.c:4526
 schedule+0xd0/0x2a0 kernel/sched/core.c:4601
 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