rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10502 ticks this GP) idle=7c6/1/0x4000000000000000 softirq=7624/7634 fqs=23 
	(t=10500 jiffies g=5745 q=745)
rcu: rcu_preempt kthread starved for 10450 jiffies! g5745 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:29312 pid:   13 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0xf93/0x2400 kernel/sched/core.c:5147
 schedule+0xdb/0x280 kernel/sched/core.c:5226
 schedule_timeout+0x133/0x220 kernel/time/timer.c:1892
 rcu_gp_fqs_loop kernel/rcu/tree.c:2004 [inline]
 rcu_gp_kthread+0xcf6/0x2230 kernel/rcu/tree.c:2177
 kthread+0x37d/0x460 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6928 Comm: syz-executor.5 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__lock_acquire+0xe21/0x53d0 kernel/locking/lockdep.c:4772
Code: 05 81 8b 09 0f 86 97 00 00 00 89 05 f9 80 8b 09 e9 8c 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 80 3c 02 00 <0f> 85 dc 2c 00 00 49 81 3e 00 07 b8 8a 0f 84 a1 f2 ff ff 83 fe 01
RSP: 0000:ffffc90000178750 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffff888123a1c0c0 RCX: 0000000000000002
RDX: 1ffffffff1316898 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc90000178868 R08: 0000000000000001 R09: 0000000000000001
R10: fffffbfff1500312 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff898b44c0 R15: 0000000000000000
FS:  00007efe8ea20700(0000) GS:ffff8881f6700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000026f7b038 CR3: 000000010186c005 CR4: 00000000001706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire kernel/locking/lockdep.c:5512 [inline]
 lock_acquire+0x22a/0x8c0 kernel/locking/lockdep.c:5477
 rcu_lock_acquire include/linux/rcupdate.h:267 [inline]
 rcu_read_lock include/linux/rcupdate.h:657 [inline]
 __perf_output_begin kernel/events/ring_buffer.c:163 [inline]
 perf_output_begin_forward+0xb3/0x9c0 kernel/events/ring_buffer.c:268
 __perf_event_output kernel/events/core.c:7447 [inline]
 perf_event_output_forward+0xf8/0x1e0 kernel/events/core.c:7465
 __perf_event_overflow+0x11e/0x380 kernel/events/core.c:9140
 perf_swevent_hrtimer+0x30e/0x370 kernel/events/core.c:10540
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x1b7/0xc30 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x2f3/0x950 kernel/time/hrtimer.c:1663
 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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x4f/0x90 kernel/locking/spinlock.c:199
Code: c0 00 05 76 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 35 48 83 3d 6a 73 ca 01 00 74 22 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 e7 72 a0 f9 65 8b 05 d0 6c 56 78 85 c0 74 08 4c
RSP: 0000:ffffc90003c4fc80 EFLAGS: 00000282
RAX: 1ffffffff12ec0a0 RBX: dffffc0000000000 RCX: 1ffffffff14ffb51
RDX: dffffc0000000000 RSI: ffffffff880b3f20 RDI: ffffffff88516ac0
RBP: ffffc90003c4fc88 R08: 0000000000000001 R09: 0000000000000001
R10: ffffed102232de78 R11: ffff888123a1c8c8 R12: ffff88811196f3c0
R13: 000000000000000b R14: ffff88811196f3c0 R15: ffff88811196f501
 spin_unlock_irq include/linux/spinlock.h:404 [inline]
 get_signal+0x14d5/0x1c70 kernel/signal.c:2821
 arch_do_signal_or_restart+0x2b3/0x2620 arch/x86/kernel/signal.c:789
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x207/0x280 kernel/entry/common.c:208
 irqentry_exit_to_user_mode+0x9/0x30 kernel/entry/common.c:314
 irqentry_exit+0x63/0x90 kernel/entry/common.c:405
 exc_page_fault+0x90/0xe0 arch/x86/mm/fault.c:1534
 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:00007efe8ea1ffc0 EFLAGS: 00010206
RAX: 0000000026f7b028 RBX: 000000000052bf00 RCX: 0000000000415827
RDX: 8cf318e2390c4a4e RSI: 0000000000000000 RDI: 00007efe8ea205f0
RBP: 0000000000000007 R08: 00007efe8ea1ffc0 R09: 0000000000000007
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff
R13: 00000000004fd358 R14: 00000000004b69b5 R15: 00007efe8ea206bc
NMI backtrace for cpu 0
CPU: 0 PID: 6914 Comm: syz-executor.3 Not tainted 5.12.0-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_dump_cpu_stacks+0x23f/0x360 kernel/rcu/tree_stall.h:341
 print_cpu_stall kernel/rcu/tree_stall.h:624 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:699 [inline]
 rcu_pending kernel/rcu/tree.c:3911 [inline]
 rcu_sched_clock_irq.cold+0x63/0x6bb kernel/rcu/tree.c:2649
 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:1373
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x1b7/0xc30 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x2f3/0x950 kernel/time/hrtimer.c:1663
 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:695 [inline]
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:140 [inline]
RIP: 0010:lock_acquire kernel/locking/lockdep.c:5515 [inline]
RIP: 0010:lock_acquire+0x654/0x8c0 kernel/locking/lockdep.c:5477
Code: 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 8b 01 00 00 48 83 3d 05 79 1e 08 00 74 5b fb 66 0f 1f 44 00 00 <e9> 00 fc ff ff 0f 0b e9 4c fa ff ff 0f 0b 0f 0b 0f 0b e9 d6 fe ff
RSP: 0000:ffffc90003bbfd08 EFLAGS: 00000282
RAX: 1ffffffff12ec0a0 RBX: 1ffff92000777fa5 RCX: 00000000f78ed667
RDX: dffffc0000000000 RSI: ffffffff880b44e0 RDI: ffffffff88516ac0
RBP: ffffc90003bbfdf0 R08: 0000000000000000 R09: ffffffff8b296c07
R10: fffffbfff1652d80 R11: 0000000000000000 R12: 0000000000000001
R13: ffff888101709858 R14: 0000000000000001 R15: 0000000000000200
 down_read_trylock kernel/locking/rwsem.c:1395 [inline]
 down_read_trylock+0x18c/0x370 kernel/locking/rwsem.c:1390
 mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
 do_user_addr_fault+0x18e/0xd70 arch/x86/mm/fault.c:1331
 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:00007f894c988fc0 EFLAGS: 00010206
RAX: 0000000026e2ce28 RBX: 000000000052bf00 RCX: 0000000000415827
RDX: 12d7edfa667d4623 RSI: 0000000000000000 RDI: 00007f894c9895f0
RBP: 0000000000000007 R08: 00007f894c988fc0 R09: 0000000000000007
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff
R13: 00000000004fd358 R14: 00000000004b69b5 R15: 00007f894c9896bc
sched: RT throttling activated