================================================================== BUG: KCSAN: data-race in icmp_global_allow / icmp_global_allow read to 0xffffffff861aca54 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] vti_xmit net/ipv4/ip_vti.c:243 [inline] vti_tunnel_xmit+0x27f/0xa50 net/ipv4/ip_vti.c:279 __netdev_start_xmit include/linux/netdevice.h:4413 [inline] netdev_start_xmit include/linux/netdevice.h:4427 [inline] xmit_one net/core/dev.c:3199 [inline] dev_hard_start_xmit+0xef/0x430 net/core/dev.c:3215 __dev_queue_xmit+0x14ab/0x1b40 net/core/dev.c:3792 dev_queue_xmit+0x21/0x30 net/core/dev.c:3825 neigh_direct_output+0x1f/0x30 net/core/neighbour.c:1530 neigh_output include/net/neighbour.h:511 [inline] ip_finish_output2+0x4af/0xe40 net/ipv4/ip_output.c:228 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x23a/0x490 net/ipv4/ip_output.c:290 ip_finish_output+0x41/0x160 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_output+0xdf/0x210 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:436 [inline] ip_local_out+0x74/0x90 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x3a8/0xa40 net/ipv4/ip_output.c:532 ip_queue_xmit+0x45/0x60 include/net/ip.h:237 __tcp_transmit_skb+0xe81/0x1d60 net/ipv4/tcp_output.c:1169 tcp_transmit_skb net/ipv4/tcp_output.c:1185 [inline] __tcp_retransmit_skb+0x4bd/0x15d0 net/ipv4/tcp_output.c:2976 tcp_retransmit_skb+0x36/0x1a0 net/ipv4/tcp_output.c:2999 tcp_retransmit_timer+0x719/0x16d0 net/ipv4/tcp_timer.c:516 tcp_write_timer_handler+0x42d/0x510 net/ipv4/tcp_timer.c:599 tcp_write_timer+0xd1/0xf0 net/ipv4/tcp_timer.c:619 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+0x49/0x80 kernel/kcov.c:225 __read_once_size+0x25/0xe0 include/linux/compiler.h:227 arch_atomic_read arch/x86/include/asm/atomic.h:31 [inline] atomic_read include/asm-generic/atomic-instrumented.h:40 [inline] total_mapcount+0x214/0x2b0 mm/huge_memory.c:2585 page_mapcount_is_zero+0x20/0x40 mm/rmap.c:1695 rmap_walk_file+0x270/0x590 mm/rmap.c:1897 rmap_walk+0x118/0x190 mm/rmap.c:1913 try_to_unmap+0x147/0x2d0 mm/rmap.c:1732 __unmap_and_move mm/migrate.c:1110 [inline] unmap_and_move mm/migrate.c:1197 [inline] migrate_pages+0x127d/0x19a0 mm/migrate.c:1427 do_mbind mm/mempolicy.c:1300 [inline] kernel_mbind+0x9a6/0xaa0 mm/mempolicy.c:1419 __do_sys_mbind mm/mempolicy.c:1426 [inline] __se_sys_mbind mm/mempolicy.c:1422 [inline] __x64_sys_mbind+0x89/0xb0 mm/mempolicy.c:1422 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffffffff861aca54 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] vti_xmit net/ipv4/ip_vti.c:243 [inline] vti_tunnel_xmit+0x27f/0xa50 net/ipv4/ip_vti.c:279 __netdev_start_xmit include/linux/netdevice.h:4413 [inline] netdev_start_xmit include/linux/netdevice.h:4427 [inline] xmit_one net/core/dev.c:3199 [inline] dev_hard_start_xmit+0xef/0x430 net/core/dev.c:3215 __dev_queue_xmit+0x14ab/0x1b40 net/core/dev.c:3792 dev_queue_xmit+0x21/0x30 net/core/dev.c:3825 neigh_direct_output+0x1f/0x30 net/core/neighbour.c:1530 neigh_output include/net/neighbour.h:511 [inline] ip_finish_output2+0x4af/0xe40 net/ipv4/ip_output.c:228 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x23a/0x490 net/ipv4/ip_output.c:290 ip_finish_output+0x41/0x160 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_output+0xdf/0x210 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:436 [inline] ip_local_out+0x74/0x90 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x3a8/0xa40 net/ipv4/ip_output.c:532 ip_queue_xmit+0x45/0x60 include/net/ip.h:237 __tcp_transmit_skb+0xe81/0x1d60 net/ipv4/tcp_output.c:1169 tcp_transmit_skb net/ipv4/tcp_output.c:1185 [inline] __tcp_retransmit_skb+0x4bd/0x15d0 net/ipv4/tcp_output.c:2976 tcp_retransmit_skb+0x36/0x1a0 net/ipv4/tcp_output.c:2999 tcp_retransmit_timer+0x719/0x16d0 net/ipv4/tcp_timer.c:516 tcp_write_timer_handler+0x42d/0x510 net/ipv4/tcp_timer.c:599 tcp_write_timer+0xd1/0xf0 net/ipv4/tcp_timer.c:619 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 arch_local_irq_restore arch/x86/include/asm/paravirt.h:756 [inline] kcsan_setup_watchpoint+0x1d4/0x460 kernel/kcsan/core.c:436 check_access kernel/kcsan/core.c:468 [inline] __tsan_read4+0xc6/0x100 kernel/kcsan/core.c:597 css_get_many include/linux/cgroup.h:329 [inline] mem_cgroup_migrate+0xa3/0x1d0 mm/memcontrol.c:6810 migrate_page_states+0x52f/0x930 mm/migrate.c:651 migrate_page_copy+0x288/0x9a0 mm/migrate.c:662 migrate_page+0xf2/0x150 mm/migrate.c:690 move_to_new_page+0xcb/0x3d0 mm/migrate.c:950 __unmap_and_move mm/migrate.c:1116 [inline] unmap_and_move mm/migrate.c:1197 [inline] migrate_pages+0x1318/0x19a0 mm/migrate.c:1427 do_mbind mm/mempolicy.c:1300 [inline] kernel_mbind+0x9a6/0xaa0 mm/mempolicy.c:1419 __do_sys_mbind mm/mempolicy.c:1426 [inline] __se_sys_mbind mm/mempolicy.c:1422 [inline] __x64_sys_mbind+0x89/0xb0 mm/mempolicy.c:1422 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 21010 Comm: syz-executor.4 Not tainted 5.4.0-rc7+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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