rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=0cf/1/0x4000000000000000 softirq=152272/152272 fqs=0 
	(detected by 1, t=10502 jiffies, g=275573, q=732)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4938 Comm: systemd-timesyn Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:advance_sched+0xd1/0x9a0 net/sched/sch_taprio.c:713
Code: e8 e8 e3 30 e2 01 31 ff 89 c5 89 c6 e8 48 a1 22 fa 85 ed 0f 84 42 06 00 00 e8 8b 98 22 fa 48 8d 43 f0 48 89 c2 48 89 44 24 28 <48> b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 a1 07
RSP: 0018:ffffc90000007dd0 EFLAGS: 00000046
RAX: ffff88801dd6f330 RBX: ffff88801dd6f340 RCX: 0000000000000000
RDX: ffff88801dd6f330 RSI: ffffffff8752bc85 RDI: 0000000000000003
RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000003
R10: ffffffff8752bc78 R11: 0000000000000000 R12: ffff88801dd6f300
R13: ffff8880775ef800 R14: ffff8880b9c223c0 R15: ffffffff8752bbc0
FS:  00007f6e675108c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000499c50 CR3: 0000000029859000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 be f5 22 f8 48 89 ef e8 06 6c 23 f8 e8 f1 d2 43 f8 fb bf 01 00 00 00 <e8> 86 2d 17 f8 65 8b 05 2f 45 ca 76 85 c0 74 02 5d c3 e8 1b 9b c8
RSP: 0018:ffffc90001ba7d90 EFLAGS: 00000246
RAX: 0000000000000007 RBX: ffff8880240fe800 RCX: 1ffffffff1add539
RDX: 0000000000000000 RSI: ffffffff817b7e01 RDI: 0000000000000001
RBP: ffff8880240fe888 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff817b7de8 R11: 0000000000000000 R12: ffff8880240fe888
R13: 0000000000000000 R14: 000001fddcfa7860 R15: 0000000000000001
 spin_unlock_irq include/linux/spinlock.h:413 [inline]
 do_timerfd_settime+0xa15/0x11f0 fs/timerfd.c:521
 __do_sys_timerfd_settime fs/timerfd.c:567 [inline]
 __se_sys_timerfd_settime fs/timerfd.c:558 [inline]
 __x64_sys_timerfd_settime+0x136/0x220 fs/timerfd.c:558
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f6e669057ba
Code: 48 8b 0d e1 f6 2a 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 1e 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ae f6 2a 00 f7 d8 64 89 01 48
RSP: 002b:00007ffd0771ac88 EFLAGS: 00000246 ORIG_RAX: 000000000000011e
RAX: ffffffffffffffda RBX: 000055ed95f388f0 RCX: 00007f6e669057ba
RDX: 00007ffd0771ac90 RSI: 0000000000000001 RDI: 0000000000000006
RBP: 00007ffd0771ac90 R08: 0000000000000000 R09: 000000000000000d
R10: 0000000000000000 R11: 0000000000000246 R12: 000055ed95f3b0a0
R13: 0000000000000001 R14: 00007ffd0771acec R15: 00007ffd0771acec
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g275573 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=149852
rcu: rcu_preempt kthread starved for 10502 jiffies! g275573 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
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:I stack:28872 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4940 [inline]
 __schedule+0x940/0x26f0 kernel/sched/core.c:6287
 schedule+0xd3/0x270 kernel/sched/core.c:6366
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
 rcu_gp_fqs_loop+0x186/0x800 kernel/rcu/tree.c:1957
 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2130
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
----------------
Code disassembly (best guess):
   0:	e8 e8 e3 30 e2       	callq  0xe230e3ed
   5:	01 31                	add    %esi,(%rcx)
   7:	ff 89 c5 89 c6 e8    	decl   -0x1739763b(%rcx)
   d:	48 a1 22 fa 85 ed 0f 	movabs 0x642840fed85fa22,%rax
  14:	84 42 06
  17:	00 00                	add    %al,(%rax)
  19:	e8 8b 98 22 fa       	callq  0xfa2298a9
  1e:	48 8d 43 f0          	lea    -0x10(%rbx),%rax
  22:	48 89 c2             	mov    %rax,%rdx
  25:	48 89 44 24 28       	mov    %rax,0x28(%rsp)
* 2a:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax <-- trapping instruction
  31:	fc ff df
  34:	48 c1 ea 03          	shr    $0x3,%rdx
  38:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  3c:	0f                   	.byte 0xf
  3d:	85                   	.byte 0x85
  3e:	a1                   	.byte 0xa1
  3f:	07                   	(bad)