rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10456 ticks this GP) idle=ac9/1/0x4000000000000000 softirq=14380/14387 fqs=2 
	(t=10501 jiffies g=13621 q=1331)
rcu: rcu_preempt kthread starved for 10493 jiffies! g13621 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:28736 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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 13178 Comm: syz-executor.1 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__kasan_check_read+0x0/0x10 mm/kasan/shadow.c:31
Code: 8b e8 2e 3a 35 07 48 85 db 0f 85 4f 91 36 07 48 83 c4 60 5b 5d 41 5c 41 5d c3 c3 e9 4f 92 36 07 cc cc cc cc cc cc cc cc cc cc <48> 8b 0c 24 89 f6 31 d2 e9 03 f9 ff ff 0f 1f 00 48 8b 0c 24 89 f6
RSP: 0018:ffffc90000dc0938 EFLAGS: 00000056
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8d6e6ad0
RBP: 1ffff920001b812a R08: 0000000000000000 R09: ffffffff8d6e6ad7
R10: fffffbfff1adcd5a R11: 0000000000000000 R12: ffffffff8b99ed48
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b9d223c0
FS:  00007f99059c6700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2c42c000 CR3: 0000000016f4c000 CR4: 0000000000350ee0
Call Trace:
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
 cpumask_test_cpu include/linux/cpumask.h:344 [inline]
 cpu_online include/linux/cpumask.h:895 [inline]
 trace_lock_release include/trace/events/lock.h:58 [inline]
 lock_release+0xa1/0x720 kernel/locking/lockdep.c:5636
 seqcount_lockdep_reader_access include/linux/seqlock.h:104 [inline]
 ktime_get+0x8d/0x470 kernel/time/timekeeping.c:827
 clockevents_program_event+0x141/0x370 kernel/time/clockevents.c:326
 tick_program_event+0xac/0x140 kernel/time/tick-oneshot.c:44
 hrtimer_interrupt+0x36e/0x790 kernel/time/hrtimer.c:1824
 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:ieee80211_scan_rx+0xf6/0x7e0 net/mac80211/scan.c:271
Code: bf 1c 01 00 00 44 89 f6 e8 17 22 f2 f8 66 41 81 fe 1c 01 b8 12 00 00 00 41 be 04 00 00 00 4c 0f 44 f0 eb 06 41 be 24 00 00 00 <e8> 35 1b f2 f8 4c 8d 6b 70 48 b8 00 00 00 00 00 fc ff df 4c 89 ea
RSP: 0018:ffffc90000dc0c40 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888017719500 RCX: ffff888083531c80
RDX: 0000000000000000 RSI: ffff888083531c80 RDI: 0000000000000003
RBP: ffff888082568d60 R08: 0000000000000000 R09: 0000000000000080
R10: ffffffff88840230 R11: 0000000000000080 R12: ffff888025433050
R13: 0000000000000080 R14: 0000000000000024 R15: ffff888082568d60
 __ieee80211_rx_handle_packet net/mac80211/rx.c:4786 [inline]
 ieee80211_rx_list+0x20fc/0x27d0 net/mac80211/rx.c:4978
 ieee80211_rx_napi+0xdb/0x3d0 net/mac80211/rx.c:5001
 ieee80211_rx include/net/mac80211.h:4571 [inline]
 ieee80211_tasklet_handler+0xd4/0x130 net/mac80211/main.c:235
 tasklet_action_common.constprop.0+0x201/0x2e0 kernel/softirq.c:783
 __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:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:6687
Code: 55 53 65 48 8b 1c 25 40 f0 01 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 d2 1c 1a f8 e8 7d af 46 f8 fb bf 01 00 00 00 <e8> d2 cd ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 d0 0b 1a
RSP: 0018:ffffc90017dc7628 EFLAGS: 00000246
RAX: 0000000000000007 RBX: ffff888083531c80 RCX: 1ffffffff1add3dd
RDX: 0000000000000000 RSI: ffffffff817c4631 RDI: 0000000000000001
RBP: ffffed10106a6390 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff817c4618 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit+0x31/0x80 kernel/entry/common.c:427
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:pipe_poll+0x5f/0x7e0 fs/pipe.c:654
Code: 00 0f 85 8c 06 00 00 48 8b 9d b0 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 5c 01 00 00 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 e2 05 00 00 4c
RSP: 0018:ffffc90017dc76f8 EFLAGS: 00000217
RAX: dffffc0000000000 RBX: ffff88807446c800 RCX: ffffc9000b68a000
RDX: 0000000000000000 RSI: ffffffff81ca8fda RDI: ffff88807446c95c
RBP: ffff8880190b8000 R08: 0000000000000000 R09: ffffffff8d6e6ad7
R10: ffffffff81cdcf8d R11: 0000000000000000 R12: ffffffff81ca8fc0
R13: 0000000000000001 R14: 0000000000000002 R15: 0000000000000001
 vfs_poll include/linux/poll.h:90 [inline]
 do_select+0x8cb/0x16a0 fs/select.c:534
 core_sys_select+0x3c2/0x9c0 fs/select.c:677
 do_pselect.constprop.0+0x17b/0x1c0 fs/select.c:759
 __do_sys_pselect6 fs/select.c:800 [inline]
 __se_sys_pselect6 fs/select.c:791 [inline]
 __x64_sys_pselect6+0x1c5/0x2b0 fs/select.c:791
 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: 0033:0x4665f9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f99059c6188 EFLAGS: 00000246 ORIG_RAX: 000000000000010e
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000040
RBP: 00000000004bfcc4 R08: 0000000020000200 R09: 0000000000000000
R10: 0000000020000140 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffc6bc1981f R14: 00007f99059c6300 R15: 0000000000022000
NMI backtrace for cpu 0
CPU: 0 PID: 13135 Comm: syz-executor.5 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194
Code: 74 24 10 e8 aa a8 24 f8 48 89 ef e8 f2 1e 25 f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 <e8> f3 df 18 f8 65 8b 05 9c 2d cb 76 85 c0 74 0a 5b 5d c3 e8 70 83
RSP: 0018:ffffc900000078d8 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000200 RCX: 1ffffffff1add3dd
RDX: 0000000000000000 RSI: ffffffff817c4631 RDI: 0000000000000001
RBP: ffff88801e19d860 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff817c4618 R11: 0000000000000080 R12: dffffc0000000000
R13: 0000000000000080 R14: ffff88801e19cc80 R15: 0000000000000000
 __ieee80211_queue_skb_to_iface net/mac80211/rx.c:221 [inline]
 ieee80211_queue_skb_to_iface net/mac80211/rx.c:232 [inline]
 ieee80211_rx_h_mgmt net/mac80211/rx.c:3788 [inline]
 ieee80211_rx_handlers+0x40e7/0xb350 net/mac80211/rx.c:3952
 ieee80211_invoke_rx_handlers net/mac80211/rx.c:3982 [inline]
 ieee80211_prepare_and_rx_handle+0x21d8/0x5010 net/mac80211/rx.c:4696
 __ieee80211_rx_handle_packet net/mac80211/rx.c:4794 [inline]
 ieee80211_rx_list+0x976/0x27d0 net/mac80211/rx.c:4978
 ieee80211_rx_napi+0xdb/0x3d0 net/mac80211/rx.c:5001
 ieee80211_rx include/net/mac80211.h:4571 [inline]
 ieee80211_tasklet_handler+0xd4/0x130 net/mac80211/main.c:235
 tasklet_action_common.constprop.0+0x201/0x2e0 kernel/softirq.c:783
 __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:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xd/0x60 kernel/kcov.c:197
Code: ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 00 65 8b 05 39 d2 8b 7e 89 c1 48 8b 34 24 <81> e1 00 01 00 00 65 48 8b 14 25 40 f0 01 00 a9 00 01 ff 00 74 0e
RSP: 0018:ffffc90017c977a8 EFLAGS: 00000293
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000001
RDX: ffff88803e490000 RSI: ffffffff81ab2505 RDI: 0000000000000003
RBP: ffff888000000118 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81ab2569 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 00007f0be910a000
 zap_pte_range mm/memory.c:1414 [inline]
 zap_pmd_range mm/memory.c:1481 [inline]
 zap_pud_range mm/memory.c:1510 [inline]
 zap_p4d_range mm/memory.c:1531 [inline]
 unmap_page_range+0xa45/0x2a10 mm/memory.c:1552
 unmap_single_vma+0x198/0x310 mm/memory.c:1597
 unmap_vmas+0x16d/0x2f0 mm/memory.c:1629
 exit_mmap+0x1d0/0x620 mm/mmap.c:3194
 __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
 get_signal+0x47f/0x2160 kernel/signal.c:2868
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
 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+0x17d/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+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
Code: Unable to access opcode bytes at RIP 0x4665cf.
RSP: 002b:00007f0be9021188 EFLAGS: 00000246 ORIG_RAX: 000000000000010e
RAX: fffffffffffffdfe RBX: 000000000056bf80 RCX: 00000000004665f9
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000040
RBP: 00000000004bfcc4 R08: 0000000020000200 R09: 0000000000000000
R10: 0000000020000140 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffe3501f72f R14: 00007f0be9021300 R15: 0000000000022000
----------------
Code disassembly (best guess):
   0:	8b e8                	mov    %eax,%ebp
   2:	2e 3a 35 07 48 85 db 	cmp    %cs:-0x247ab7f9(%rip),%dh        # 0xdb854810
   9:	0f 85 4f 91 36 07    	jne    0x736915e
   f:	48 83 c4 60          	add    $0x60,%rsp
  13:	5b                   	pop    %rbx
  14:	5d                   	pop    %rbp
  15:	41 5c                	pop    %r12
  17:	41 5d                	pop    %r13
  19:	c3                   	retq
  1a:	c3                   	retq
  1b:	e9 4f 92 36 07       	jmpq   0x736926f
  20:	cc                   	int3
  21:	cc                   	int3
  22:	cc                   	int3
  23:	cc                   	int3
  24:	cc                   	int3
  25:	cc                   	int3
  26:	cc                   	int3
  27:	cc                   	int3
  28:	cc                   	int3
  29:	cc                   	int3
* 2a:	48 8b 0c 24          	mov    (%rsp),%rcx <-- trapping instruction
  2e:	89 f6                	mov    %esi,%esi
  30:	31 d2                	xor    %edx,%edx
  32:	e9 03 f9 ff ff       	jmpq   0xfffff93a
  37:	0f 1f 00             	nopl   (%rax)
  3a:	48 8b 0c 24          	mov    (%rsp),%rcx
  3e:	89 f6                	mov    %esi,%esi