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BUG: KCSAN: data-race in icmp_global_allow / icmp_global_allow

write to 0xffffffff861a4a54 of 4 bytes by interrupt on cpu 0:
 icmp_global_allow+0x174/0x1b0 net/ipv4/icmp.c:272
 icmpv4_global_allow net/ipv4/icmp.c:299 [inline]
 icmpv4_global_allow+0x83/0xc0 net/ipv4/icmp.c:294
 __icmp_send+0x925/0xaa0 net/ipv4/icmp.c:664
 ipv4_send_dest_unreach net/ipv4/route.c:1220 [inline]
 ipv4_link_failure+0x22d/0x400 net/ipv4/route.c:1227
 dst_link_failure include/net/dst.h:419 [inline]
 arp_error_report+0x72/0x90 net/ipv4/arp.c:293
 neigh_invalidate+0x1b2/0x320 net/core/neighbour.c:996
 neigh_timer_handler+0x7cb/0x870 net/core/neighbour.c:1082
 call_timer_fn+0x5f/0x2f0 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0xc0c/0xcd0 kernel/time/timer.c:1786
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0xbb/0xe0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0xe6/0x280 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 __sanitizer_cov_trace_switch+0xb/0x80 kernel/kcov.c:202
 __read_once_size+0x25/0xe0 include/linux/compiler.h:229
 compound_head include/linux/page-flags.h:174 [inline]
 PageAnon include/linux/page-flags.h:463 [inline]
 mm_counter include/linux/mm.h:1671 [inline]
 zap_pte_range mm/memory.c:1061 [inline]
 zap_pmd_range mm/memory.c:1166 [inline]
 zap_pud_range mm/memory.c:1195 [inline]
 zap_p4d_range mm/memory.c:1216 [inline]
 unmap_page_range+0xa98/0x18d0 mm/memory.c:1237
 unmap_single_vma+0x144/0x200 mm/memory.c:1282
 unmap_vmas+0xda/0x1a0 mm/memory.c:1314
 exit_mmap+0x13e/0x300 mm/mmap.c:3161
 __mmput kernel/fork.c:1079 [inline]
 mmput+0xea/0x280 kernel/fork.c:1100
 exit_mm kernel/exit.c:485 [inline]
 do_exit+0x4c9/0x18f0 kernel/exit.c:804
 do_group_exit+0xb4/0x1c0 kernel/exit.c:921
 get_signal+0x2a2/0x1320 kernel/signal.c:2734
 do_signal+0x2f/0x6c0 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x250/0x2c0 arch/x86/entry/common.c:159
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x353/0x370 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffffff861a4a54 of 4 bytes by interrupt on cpu 1:
 icmp_global_allow+0x36/0x1b0 net/ipv4/icmp.c:254
 icmpv4_global_allow net/ipv4/icmp.c:299 [inline]
 icmpv4_global_allow+0x83/0xc0 net/ipv4/icmp.c:294
 __icmp_send+0x925/0xaa0 net/ipv4/icmp.c:664
 ipv4_send_dest_unreach net/ipv4/route.c:1220 [inline]
 ipv4_link_failure+0x22d/0x400 net/ipv4/route.c:1227
 dst_link_failure include/net/dst.h:419 [inline]
 arp_error_report+0x72/0x90 net/ipv4/arp.c:293
 neigh_invalidate+0x1b2/0x320 net/core/neighbour.c:996
 neigh_timer_handler+0x7cb/0x870 net/core/neighbour.c:1082
 call_timer_fn+0x5f/0x2f0 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0xc0c/0xcd0 kernel/time/timer.c:1786
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0xbb/0xe0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0xe6/0x280 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 __sanitizer_cov_trace_const_cmp1+0x1/0x20 kernel/kcov.c:174
 unmap_single_vma+0x144/0x200 mm/memory.c:1282
 unmap_vmas+0xda/0x1a0 mm/memory.c:1314
 exit_mmap+0x13e/0x300 mm/mmap.c:3161
 __mmput kernel/fork.c:1079 [inline]
 mmput+0xea/0x280 kernel/fork.c:1100
 exit_mm kernel/exit.c:485 [inline]
 do_exit+0x4c9/0x18f0 kernel/exit.c:804
 do_group_exit+0xb4/0x1c0 kernel/exit.c:921
 get_signal+0x2a2/0x1320 kernel/signal.c:2734
 do_signal+0x2f/0x6c0 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x250/0x2c0 arch/x86/entry/common.c:159
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x353/0x370 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 14822 Comm: syz-executor.4 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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