rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10500 ticks this GP) idle=04e/1/0x4000000000000000 softirq=68857/68857 fqs=1 
	(t=10501 jiffies g=118797 q=76)
rcu: rcu_preempt kthread starved for 10500 jiffies! g118797 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:I stack:29184 pid:   13 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4313 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5064
 schedule+0xcf/0x270 kernel/sched/core.c:5143
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1878
 rcu_gp_fqs_loop kernel/rcu/tree.c:1940 [inline]
 rcu_gp_kthread+0xbbe/0x1d70 kernel/rcu/tree.c:2113
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
NMI backtrace for cpu 0
CPU: 0 PID: 8438 Comm: syz-executor.1 Not tainted 5.11.0-rc3-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+0x107/0x163 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x1f4/0x230 kernel/rcu/tree_stall.h:337
 print_cpu_stall kernel/rcu/tree_stall.h:569 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:643 [inline]
 rcu_pending kernel/rcu/tree.c:3751 [inline]
 rcu_sched_clock_irq.cold+0x48e/0xedf kernel/rcu/tree.c:2580
 update_process_times+0x16d/0x200 kernel/time/timer.c:1782
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline]
 sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:90 [inline]
RIP: 0010:lockdep_enabled+0x52/0xa0 kernel/locking/lockdep.c:82
Code: d2 75 5a 8b 15 0b e2 ab 0b 31 c0 85 d2 74 4c 65 8b 15 e2 38 aa 7e 85 d2 75 41 65 48 8b 1c 25 00 f0 01 00 48 8d bb 84 09 00 00 <48> b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48
RSP: 0018:ffffc90000007c18 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8880b0c41bc0 RCX: 1ffffffff1a0754b
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff8880b0c42544
RBP: ffffffff8b373860 R08: 0000000000000000 R09: ffffffff8d03788f
R10: fffffbfff1a06f11 R11: 0000000000000000 R12: 0000000000000001
R13: 1ffff92000000fa9 R14: 00000000ffffffff R15: 0000000000000000
 lock_is_held_type+0x19/0x100 kernel/locking/lockdep.c:5469
 lock_is_held include/linux/lockdep.h:271 [inline]
 rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:123
 trace_lock_release include/trace/events/lock.h:58 [inline]
 lock_release+0x5b7/0x710 kernel/locking/lockdep.c:5448
 call_timer_fn+0x227/0x6b0 kernel/time/timer.c:1420
 expire_timers kernel/time/timer.c:1462 [inline]
 __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731
 __run_timers kernel/time/timer.c:1712 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744
 __do_softirq+0x2bc/0xa29 kernel/softirq.c:343
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:226 [inline]
 __irq_exit_rcu kernel/softirq.c:420 [inline]
 irq_exit_rcu+0x134/0x200 kernel/softirq.c:432
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:197
Code: 00 00 00 4d 8b 0b 48 0f bd c8 49 8b 14 24 48 63 c9 e9 66 ff ff ff 4c 01 ca 49 89 13 e9 00 fd ff ff 66 0f 1f 84 00 00 00 00 00 <65> 8b 05 f9 25 8f 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b
RSP: 0018:ffffc900026bf720 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffea000163f980 RCX: ffff8880b0c41bc0
RDX: 0000000000000000 RSI: ffff8880b0c41bc0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81b0a4b7 R11: 0000000000000000 R12: ffffea000163f988
R13: 0000000000000000 R14: 0000000000000000 R15: dead000000000100
 PageTail include/linux/page-flags.h:193 [inline]
 PageCompound include/linux/page-flags.h:198 [inline]
 PageHuge+0xe1/0x170 mm/hugetlb.c:1551
 page_remove_file_rmap mm/rmap.c:1247 [inline]
 page_remove_rmap+0x594/0x1360 mm/rmap.c:1337
 zap_pte_range mm/memory.c:1264 [inline]
 zap_pmd_range mm/memory.c:1368 [inline]
 zap_pud_range mm/memory.c:1397 [inline]
 zap_p4d_range mm/memory.c:1418 [inline]
 unmap_page_range+0xe30/0x2640 mm/memory.c:1439
 unmap_single_vma+0x198/0x300 mm/memory.c:1484
 unmap_vmas+0x168/0x2e0 mm/memory.c:1516
 exit_mmap+0x2b1/0x5a0 mm/mmap.c:3220
 __mmput+0x122/0x470 kernel/fork.c:1083
 mmput+0x53/0x60 kernel/fork.c:1104
 exit_mm kernel/exit.c:501 [inline]
 do_exit+0xb6a/0x2ae0 kernel/exit.c:812
 do_group_exit+0x125/0x310 kernel/exit.c:922
 get_signal+0x3e9/0x20a0 kernel/signal.c:2770
 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811
 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+0x148/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
Code: Unable to access opcode bytes at RIP 0x45e1ef.
RSP: 002b:00007fa8232cfc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: 0000000000000004 RBX: 0000000000000003 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 0000000000141042 RDI: 0000000020000080
RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00000000016afb5f R14: 00007fa8232d09c0 R15: 000000000119bf8c