rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1):
	(detected by 1, t=10502 jiffies, g=402113, q=30035)
rcu: All QSes seen, last rcu_preempt kthread activity 2865 (4295181510-4295178645), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 2864 jiffies! g402113 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=123641
rcu: rcu_preempt kthread starved for 2865 jiffies! g402113 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:28800 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x23e0 kernel/sched/core.c:5147
 schedule+0xcf/0x270 kernel/sched/core.c:5226
 schedule_timeout+0x14a/0x250 kernel/time/timer.c:1892
 rcu_gp_fqs_loop kernel/rcu/tree.c:2004 [inline]
 rcu_gp_kthread+0xd07/0x2300 kernel/rcu/tree.c:2177
 kthread+0x3b1/0x4a0 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 12559 Comm: syz-executor.3 Not tainted 5.13.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__this_cpu_preempt_check+0xd/0x20 lib/smp_processor_id.c:70
Code: 00 00 48 c7 c6 00 e8 c2 89 48 c7 c7 40 e8 c2 89 e9 98 fe ff ff 0f 1f 84 00 00 00 00 00 55 48 89 fd 0f 1f 44 00 00 48 89 ee 5d <48> c7 c7 80 e8 c2 89 e9 77 fe ff ff cc cc cc cc cc cc cc eb 1e 0f
RSP: 0018:ffffc90000007fd0 EFLAGS: 00000002
RAX: 0000000000000000 RBX: ffffc900218174e8 RCX: 1ffff11017383f04
RDX: dffffc0000000000 RSI: ffffffff896843a0 RDI: ffffffff896843a0
RBP: 0000000000000000 R08: ffffffff8f421018 R09: ffffffff8f42100f
R10: ffffffff8f421017 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007eff1fa27710 CR3: 000000002cc9a000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 set_irq_regs include/asm-generic/irq_regs.h:29 [inline]
 __sysvec_apic_timer_interrupt+0x27/0x540 arch/x86/kernel/apic/apic.c:1102
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:106 [inline]
RIP: 0010:lock_is_held_type+0x51/0x140 kernel/locking/lockdep.c:5553
Code: eb 76 85 c0 0f 85 c8 00 00 00 65 4c 8b 24 25 00 f0 01 00 41 8b 94 24 f4 09 00 00 85 d2 0f 85 af 00 00 00 48 89 fd 41 89 f6 9c <8f> 04 24 fa 48 c7 c7 c0 b7 6b 89 31 db e8 7d 0e 00 00 41 8b 84 24
RSP: 0018:ffffc90021817590 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff92004302ebf RCX: 0000000000000001
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff8bf797a0
RBP: ffffffff8bf797a0 R08: 0000000000000000 R09: ffffffff8dc97917
R10: fffffbfff1b92f22 R11: 0000000000000000 R12: ffff8881bfadb880
R13: 00000000ffffffff R14: 00000000ffffffff R15: 0000000000000000
 lock_is_held include/linux/lockdep.h:283 [inline]
 rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x4a1/0x510 kernel/locking/lockdep.c:5485
 rcu_lock_acquire include/linux/rcupdate.h:267 [inline]
 rcu_read_lock include/linux/rcupdate.h:657 [inline]
 lock_page_memcg+0x66/0x7d0 mm/memcontrol.c:1982
 page_remove_rmap+0x25/0x1430 mm/rmap.c:1345
 zap_pte_range mm/memory.c:1270 [inline]
 zap_pmd_range mm/memory.c:1385 [inline]
 zap_pud_range mm/memory.c:1414 [inline]
 zap_p4d_range mm/memory.c:1435 [inline]
 unmap_page_range+0xea6/0x2890 mm/memory.c:1456
 unmap_single_vma+0x198/0x300 mm/memory.c:1501
 unmap_vmas+0x16d/0x2f0 mm/memory.c:1533
 exit_mmap+0x2a8/0x590 mm/mmap.c:3208
 __mmput+0x122/0x470 kernel/fork.c:1096
 mmput+0x58/0x60 kernel/fork.c:1117
 exit_mm kernel/exit.c:502 [inline]
 do_exit+0xb0a/0x2a60 kernel/exit.c:813
 do_group_exit+0x125/0x310 kernel/exit.c:923
 get_signal+0x47f/0x2150 kernel/signal.c:2850
 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x180/0x290 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:57
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
Code: Unable to access opcode bytes at RIP 0x4665af.
RSP: 002b:00007f9a18506218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000056bf88 RCX: 00000000004665d9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf88
RBP: 000000000056bf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf8c
R13: 0000000000a9fb1f R14: 00007f9a18506300 R15: 0000000000022000