================================================================== BUG: KCSAN: data-race in iptunnel_xmit / iptunnel_xmit read-write to 0xffff88810a0d8140 of 8 bytes by task 10596 on cpu 1: iptunnel_xmit_stats include/net/ip_tunnels.h:459 [inline] iptunnel_xmit+0x3f7/0x460 net/ipv4/ip_tunnel_core.c:87 ip_tunnel_xmit+0x1089/0x1130 net/ipv4/ip_tunnel.c:806 __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:4776 [inline] netdev_start_xmit include/linux/netdevice.h:4790 [inline] xmit_one+0xf9/0x2e0 net/core/dev.c:3574 dev_hard_start_xmit net/core/dev.c:3590 [inline] __dev_queue_xmit+0xecf/0x1500 net/core/dev.c:4151 dev_queue_xmit+0x13/0x20 net/core/dev.c:4184 __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+0x56/0xb8 bpf_dispatcher_nop_func include/linux/bpf.h:651 [inline] bpf_test_run+0x278/0x440 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:3120 [inline] __do_sys_bpf+0x3a17/0x99c0 kernel/bpf/syscall.c:4398 __se_sys_bpf kernel/bpf/syscall.c:4338 [inline] __x64_sys_bpf+0x3d/0x50 kernel/bpf/syscall.c:4338 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read-write to 0xffff88810a0d8140 of 8 bytes by task 10592 on cpu 0: iptunnel_xmit_stats include/net/ip_tunnels.h:459 [inline] iptunnel_xmit+0x3f7/0x460 net/ipv4/ip_tunnel_core.c:87 ip_tunnel_xmit+0x1089/0x1130 net/ipv4/ip_tunnel.c:806 __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:4776 [inline] netdev_start_xmit include/linux/netdevice.h:4790 [inline] xmit_one+0xf9/0x2e0 net/core/dev.c:3574 dev_hard_start_xmit net/core/dev.c:3590 [inline] __dev_queue_xmit+0xecf/0x1500 net/core/dev.c:4151 dev_queue_xmit+0x13/0x20 net/core/dev.c:4184 __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_d7d583f53caddbf0+0x56/0x974 bpf_dispatcher_nop_func include/linux/bpf.h:651 [inline] bpf_test_run+0x278/0x440 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:3120 [inline] __do_sys_bpf+0x3a17/0x99c0 kernel/bpf/syscall.c:4398 __se_sys_bpf kernel/bpf/syscall.c:4338 [inline] __x64_sys_bpf+0x3d/0x50 kernel/bpf/syscall.c:4338 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: 10592 Comm: syz-executor.0 Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================