================================================================== BUG: KCSAN: data-race in iptunnel_xmit / iptunnel_xmit read-write to 0xffff88813ae40140 of 8 bytes by task 10618 on cpu 1: iptunnel_xmit_stats include/net/ip_tunnels.h:461 [inline] iptunnel_xmit+0x3f7/0x460 net/ipv4/ip_tunnel_core.c:87 ip_tunnel_xmit+0x1084/0x11b0 net/ipv4/ip_tunnel.c:807 __gre_xmit net/ipv4/ip_gre.c:466 [inline] ipgre_xmit+0x4d9/0x530 net/ipv4/ip_gre.c:648 __netdev_start_xmit include/linux/netdevice.h:4723 [inline] netdev_start_xmit include/linux/netdevice.h:4737 [inline] xmit_one+0xf9/0x2e0 net/core/dev.c:3564 dev_hard_start_xmit net/core/dev.c:3580 [inline] __dev_queue_xmit+0xeef/0x1510 net/core/dev.c:4140 dev_queue_xmit+0x13/0x20 net/core/dev.c:4173 __bpf_tx_skb net/core/filter.c:2116 [inline] __bpf_redirect_no_mac net/core/filter.c:2141 [inline] __bpf_redirect+0x544/0x750 net/core/filter.c:2164 ____bpf_clone_redirect net/core/filter.c:2448 [inline] bpf_clone_redirect+0x168/0x1c0 net/core/filter.c:2420 bpf_prog_bebbfe2050753572+0x56/0x65c bpf_dispatcher_nop_func include/linux/bpf.h:644 [inline] bpf_test_run+0x266/0x450 net/bpf/test_run.c:50 bpf_prog_test_run_skb+0x6f0/0xe70 net/bpf/test_run.c:581 bpf_prog_test_run kernel/bpf/syscall.c:3125 [inline] __do_sys_bpf+0x39d6/0x9aa0 kernel/bpf/syscall.c:4417 __se_sys_bpf kernel/bpf/syscall.c:4357 [inline] __x64_sys_bpf+0x3d/0x50 kernel/bpf/syscall.c:4357 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read-write to 0xffff88813ae40140 of 8 bytes by task 10625 on cpu 0: iptunnel_xmit_stats include/net/ip_tunnels.h:461 [inline] iptunnel_xmit+0x3f7/0x460 net/ipv4/ip_tunnel_core.c:87 ip_tunnel_xmit+0x1084/0x11b0 net/ipv4/ip_tunnel.c:807 __gre_xmit net/ipv4/ip_gre.c:466 [inline] ipgre_xmit+0x4d9/0x530 net/ipv4/ip_gre.c:648 __netdev_start_xmit include/linux/netdevice.h:4723 [inline] netdev_start_xmit include/linux/netdevice.h:4737 [inline] xmit_one+0xf9/0x2e0 net/core/dev.c:3564 dev_hard_start_xmit net/core/dev.c:3580 [inline] __dev_queue_xmit+0xeef/0x1510 net/core/dev.c:4140 dev_queue_xmit+0x13/0x20 net/core/dev.c:4173 __bpf_tx_skb net/core/filter.c:2116 [inline] __bpf_redirect_no_mac net/core/filter.c:2141 [inline] __bpf_redirect+0x544/0x750 net/core/filter.c:2164 ____bpf_clone_redirect net/core/filter.c:2448 [inline] bpf_clone_redirect+0x168/0x1c0 net/core/filter.c:2420 bpf_prog_bebbfe2050753572+0x56/0xc8c bpf_dispatcher_nop_func include/linux/bpf.h:644 [inline] bpf_test_run+0x266/0x450 net/bpf/test_run.c:50 bpf_prog_test_run_skb+0x6f0/0xe70 net/bpf/test_run.c:581 bpf_prog_test_run kernel/bpf/syscall.c:3125 [inline] __do_sys_bpf+0x39d6/0x9aa0 kernel/bpf/syscall.c:4417 __se_sys_bpf kernel/bpf/syscall.c:4357 [inline] __x64_sys_bpf+0x3d/0x50 kernel/bpf/syscall.c:4357 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 10625 Comm: syz-executor.1 Not tainted 5.10.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================