rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10478 ticks this GP) idle=b27/1/0x4000000000000000 softirq=8780/8796 fqs=148 
	(t=10502 jiffies g=8205 q=3798)
rcu: rcu_preempt kthread starved for 6622 jiffies! g8205 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:29272 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:
NMI backtrace for cpu 0
CPU: 0 PID: 8629 Comm: syz-executor039 Not tainted 5.14.0-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:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:481
 print_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3880 [inline]
 rcu_sched_clock_irq.cold+0x98/0x746 kernel/rcu/tree.c:2599
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 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+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__memset+0x24/0x30 arch/x86/lib/memset_64.S:39
Code: cc cc cc cc cc cc 0f 1f 44 00 00 49 89 f9 48 89 d1 83 e2 07 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 <f3> 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3
RSP: 0018:ffffc90000007ac8 EFLAGS: 00000216
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 000000000000001c
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88801780ec88
RBP: ffff888011c0d140 R08: 00000000f1f4758d R09: ffff88801780ec80
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000a20
R13: 0000000000000a20 R14: 00000000ffffffff R15: 0000000000000000
 slab_post_alloc_hook mm/slab.h:521 [inline]
 slab_alloc_node mm/slub.c:2959 [inline]
 kmem_cache_alloc_node+0x289/0x3e0 mm/slub.c:2995
 __alloc_skb+0x20b/0x340 net/core/skbuff.c:414
 skb_copy+0x137/0x2f0 net/core/skbuff.c:1585
 mac80211_hwsim_tx_frame_no_nl.isra.0+0xb17/0x1330 drivers/net/wireless/mac80211_hwsim.c:1565
 mac80211_hwsim_tx_frame+0x1ee/0x2a0 drivers/net/wireless/mac80211_hwsim.c:1784
 mac80211_hwsim_beacon_tx+0x49b/0x930 drivers/net/wireless/mac80211_hwsim.c:1838
 __iterate_interfaces+0x1e5/0x520 net/mac80211/util.c:793
 ieee80211_iterate_active_interfaces_atomic+0x70/0x180 net/mac80211/util.c:829
 mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1861
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:636
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:PageCompound include/linux/page-flags.h:201 [inline]
RIP: 0010:page_mapcount include/linux/mm.h:874 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1363 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1481 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1510 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1531 [inline]
RIP: 0010:unmap_page_range+0xef8/0x2a10 mm/memory.c:1552
Code: 89 ef e8 eb 29 05 00 be 08 00 00 00 48 89 ef e8 be c0 11 00 48 89 e8 48 c1 e8 03 42 80 3c 30 00 0f 85 f6 16 00 00 48 8b 5d 00 <31> ff 48 c1 eb 10 83 e3 01 89 de e8 b8 12 cb ff 84 db 0f 84 97 04
RSP: 0018:ffffc90001f4fa00 EFLAGS: 00000246
RAX: 1ffffd40001ad0c8 RBX: 00fff00000002036 RCX: ffffffff81ab09e2
RDX: fffff940001ad0c9 RSI: 0000000000000008 RDI: ffffea0000d68640
RBP: ffffea0000d68640 R08: 0000000000000000 R09: ffffea0000d68647
R10: fffff940001ad0c8 R11: 0000000000000000 R12: ffffea0000d68648
R13: ffffea0000d66f88 R14: dffffc0000000000 R15: 0000000000466000
 unmap_single_vma+0x198/0x310 mm/memory.c:1597
 unmap_vmas+0x16d/0x2f0 mm/memory.c:1629
 exit_mmap+0x1d0/0x620 mm/mmap.c:3195
 __mmput+0x122/0x470 kernel/fork.c:1103
 mmput+0x58/0x60 kernel/fork.c:1124
 exit_mm kernel/exit.c:501 [inline]
 do_exit+0xabc/0x2a30 kernel/exit.c:812
 do_group_exit+0x125/0x310 kernel/exit.c:922
 __do_sys_exit_group kernel/exit.c:933 [inline]
 __se_sys_exit_group kernel/exit.c:931 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
 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: 0033:0x4404f9
Code: Unable to access opcode bytes at RIP 0x4404cf.
RSP: 002b:00007fff488d1588 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00000000004b83d0 RCX: 00000000004404f9
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 00000000004b83d0
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
NMI backtrace for cpu 0
CPU: 0 PID: 8629 Comm: syz-executor039 Not tainted 5.14.0-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:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3880 [inline]
 rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2599
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 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+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__memset+0x24/0x30 arch/x86/lib/memset_64.S:39
Code: cc cc cc cc cc cc 0f 1f 44 00 00 49 89 f9 48 89 d1 83 e2 07 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 <f3> 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3
RSP: 0018:ffffc90000007ac8 EFLAGS: 00000216
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 000000000000001c
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88801780ec88
RBP: ffff888011c0d140 R08: 00000000f1f4758d R09: ffff88801780ec80
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000a20
R13: 0000000000000a20 R14: 00000000ffffffff R15: 0000000000000000
 slab_post_alloc_hook mm/slab.h:521 [inline]
 slab_alloc_node mm/slub.c:2959 [inline]
 kmem_cache_alloc_node+0x289/0x3e0 mm/slub.c:2995
 __alloc_skb+0x20b/0x340 net/core/skbuff.c:414
 skb_copy+0x137/0x2f0 net/core/skbuff.c:1585
 mac80211_hwsim_tx_frame_no_nl.isra.0+0xb17/0x1330 drivers/net/wireless/mac80211_hwsim.c:1565
 mac80211_hwsim_tx_frame+0x1ee/0x2a0 drivers/net/wireless/mac80211_hwsim.c:1784
 mac80211_hwsim_beacon_tx+0x49b/0x930 drivers/net/wireless/mac80211_hwsim.c:1838
 __iterate_interfaces+0x1e5/0x520 net/mac80211/util.c:793
 ieee80211_iterate_active_interfaces_atomic+0x70/0x180 net/mac80211/util.c:829
 mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1861
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:636
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:PageCompound include/linux/page-flags.h:201 [inline]
RIP: 0010:page_mapcount include/linux/mm.h:874 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1363 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1481 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1510 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1531 [inline]
RIP: 0010:unmap_page_range+0xef8/0x2a10 mm/memory.c:1552
Code: 89 ef e8 eb 29 05 00 be 08 00 00 00 48 89 ef e8 be c0 11 00 48 89 e8 48 c1 e8 03 42 80 3c 30 00 0f 85 f6 16 00 00 48 8b 5d 00 <31> ff 48 c1 eb 10 83 e3 01 89 de e8 b8 12 cb ff 84 db 0f 84 97 04
RSP: 0018:ffffc90001f4fa00 EFLAGS: 00000246
RAX: 1ffffd40001ad0c8 RBX: 00fff00000002036 RCX: ffffffff81ab09e2
RDX: fffff940001ad0c9 RSI: 0000000000000008 RDI: ffffea0000d68640
RBP: ffffea0000d68640 R08: 0000000000000000 R09: ffffea0000d68647
R10: fffff940001ad0c8 R11: 0000000000000000 R12: ffffea0000d68648
R13: ffffea0000d66f88 R14: dffffc0000000000 R15: 0000000000466000
 unmap_single_vma+0x198/0x310 mm/memory.c:1597
 unmap_vmas+0x16d/0x2f0 mm/memory.c:1629
 exit_mmap+0x1d0/0x620 mm/mmap.c:3195
 __mmput+0x122/0x470 kernel/fork.c:1103
 mmput+0x58/0x60 kernel/fork.c:1124
 exit_mm kernel/exit.c:501 [inline]
 do_exit+0xabc/0x2a30 kernel/exit.c:812
 do_group_exit+0x125/0x310 kernel/exit.c:922
 __do_sys_exit_group kernel/exit.c:933 [inline]
 __se_sys_exit_group kernel/exit.c:931 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
 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: 0033:0x4404f9
Code: Unable to access opcode bytes at RIP 0x4404cf.
RSP: 002b:00007fff488d1588 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00000000004b83d0 RCX: 00000000004404f9
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 00000000004b83d0
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
----------------
Code disassembly (best guess):
   0:	cc                   	int3
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	cc                   	int3
   6:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   b:	49 89 f9             	mov    %rdi,%r9
   e:	48 89 d1             	mov    %rdx,%rcx
  11:	83 e2 07             	and    $0x7,%edx
  14:	48 c1 e9 03          	shr    $0x3,%rcx
  18:	40 0f b6 f6          	movzbl %sil,%esi
  1c:	48 b8 01 01 01 01 01 	movabs $0x101010101010101,%rax
  23:	01 01 01
  26:	48 0f af c6          	imul   %rsi,%rax
* 2a:	f3 48 ab             	rep stos %rax,%es:(%rdi) <-- trapping instruction
  2d:	89 d1                	mov    %edx,%ecx
  2f:	f3 aa                	rep stos %al,%es:(%rdi)
  31:	4c 89 c8             	mov    %r9,%rax
  34:	c3                   	retq
  35:	90                   	nop
  36:	49 89 f9             	mov    %rdi,%r9
  39:	40 88 f0             	mov    %sil,%al
  3c:	48 89 d1             	mov    %rdx,%rcx
  3f:	f3                   	repz