hrtimer: interrupt took 191688 ns
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 1, t=10502 jiffies, g=6233, q=215)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294953321-4294942818), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g6233 f0x2 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:28744 pid:   13 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4324 [inline]
 __schedule+0xf86/0x2180 kernel/sched/core.c:5075
 schedule+0xdb/0x280 kernel/sched/core.c:5154
 schedule_timeout+0x133/0x220 kernel/time/timer.c:1892
 rcu_gp_fqs_loop kernel/rcu/tree.c:2005 [inline]
 rcu_gp_kthread+0xcf6/0x2200 kernel/rcu/tree.c:2178
 kthread+0x37d/0x460 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 1
CPU: 1 PID: 6930 Comm: syz-executor.0 Not tainted 5.12.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x114/0x14e lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x30/0x9c lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x120/0x170 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:39
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_check_gp_kthread_starvation+0x1a1/0x1b8 kernel/rcu/tree_stall.h:478
 print_other_cpu_stall kernel/rcu/tree_stall.h:582 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:706 [inline]
 rcu_pending kernel/rcu/tree.c:3830 [inline]
 rcu_sched_clock_irq.cold+0xac2/0x11b6 kernel/rcu/tree.c:2650
 update_process_times+0x139/0x1b0 kernel/time/timer.c:1796
 tick_sched_handle+0x77/0x140 kernel/time/tick-sched.c:226
 tick_sched_timer+0x142/0x230 kernel/time/tick-sched.c:1369
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x1b7/0xc30 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x2f6/0x900 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x143/0x530 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x98/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:arch_local_irq_enable arch/x86/include/asm/paravirt.h:659 [inline]
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:145 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x72/0x8b kernel/locking/spinlock.c:191
Code: c0 80 b9 75 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 1c 48 83 3d d7 a0 d4 01 00 74 10 fb 66 0f 1f 44 00 00 <eb> b3 e8 8e 4a 5f f9 eb c1 0f 0b 48 c7 c7 80 b9 75 89 e8 c7 14 09
RSP: 0000:ffffc90003f47cb0 EFLAGS: 00000286
RAX: 1ffffffff12eb730 RBX: 0000000000000286 RCX: 1ffffffff14fdc19
RDX: dffffc0000000000 RSI: ffffffff880b22a0 RDI: ffffffff8850b260
RBP: ffffc90003f47cc0 R08: 0000000000000001 R09: 0000000000000001
R10: ffffed10224d8e68 R11: ffff88810270caf8 R12: ffff8881126c7340
R13: 0000000000000286 R14: 0000000000000000 R15: 000000000000000b
 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline]
 force_sig_info_to_task+0x262/0x3a0 kernel/signal.c:1335
 force_sig_fault_to_task kernel/signal.c:1673 [inline]
 force_sig_fault+0xc3/0x100 kernel/signal.c:1680
 __bad_area_nosemaphore+0x21f/0x3b0 arch/x86/mm/fault.c:840
 __bad_area+0x7b/0xb0 arch/x86/mm/fault.c:863
 bad_area+0x11/0x20 arch/x86/mm/fault.c:869
 do_user_addr_fault+0x688/0xd70 arch/x86/mm/fault.c:1353
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x6f/0xe0 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577
RIP: 0033:0x40a497
Code: c7 44 24 18 00 00 00 00 8b 7c 24 20 31 d2 be 01 4c 00 00 31 c0 e8 59 7b 05 00 e9 3b fe ff ff 48 6b 44 24 10 18 48 03 44 24 28 <48> 8b 48 10 48 8b 50 08 48 8b 30 8b 7c 24 1c e8 25 b3 00 00 89 44
RSP: 002b:00007fb6bd045fc0 EFLAGS: 00010206
RAX: 0000000024915150 RBX: 000000000052bf00 RCX: 0000000000415827
RDX: 79c009be0c046b8d RSI: 0000000000000000 RDI: 00007fb6bd0465f0
RBP: 0000000000000007 R08: 00007fb6bd045fc0 R09: 0000000000000007
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff
R13: 00000000004fd358 R14: 00000000004b69b5 R15: 00007fb6bd0466bc