================================================================== BUG: KCSAN: data-race in iptunnel_xmit / iptunnel_xmit read to 0xffff888131eae160 of 8 bytes by task 12492 on cpu 1: iptunnel_xmit_stats include/net/ip_tunnels.h:460 [inline] iptunnel_xmit+0x46f/0x500 net/ipv4/ip_tunnel_core.c:87 ip_tunnel_xmit+0xf79/0x1210 net/ipv4/ip_tunnel.c:810 __gre_xmit net/ipv4/ip_gre.c:471 [inline] ipgre_xmit+0x553/0x5a0 net/ipv4/ip_gre.c:658 __netdev_start_xmit include/linux/netdevice.h:4994 [inline] netdev_start_xmit include/linux/netdevice.h:5008 [inline] xmit_one+0x105/0x2f0 net/core/dev.c:3590 dev_hard_start_xmit net/core/dev.c:3606 [inline] __dev_queue_xmit+0x869/0xf70 net/core/dev.c:4229 dev_queue_xmit+0x13/0x20 net/core/dev.c:4262 __bpf_tx_skb net/core/filter.c:2114 [inline] __bpf_redirect_no_mac net/core/filter.c:2139 [inline] __bpf_redirect+0x5a2/0x840 net/core/filter.c:2162 ____bpf_clone_redirect net/core/filter.c:2429 [inline] bpf_clone_redirect+0x168/0x1c0 net/core/filter.c:2401 ___bpf_prog_run+0xc87/0x30c0 kernel/bpf/core.c:1558 __bpf_prog_run512+0x70/0xa0 kernel/bpf/core.c:1786 bpf_dispatcher_nop_func include/linux/bpf.h:727 [inline] __bpf_prog_run include/linux/filter.h:626 [inline] bpf_prog_run include/linux/filter.h:633 [inline] bpf_test_run+0x18b/0x400 net/bpf/test_run.c:120 bpf_prog_test_run_skb+0x73d/0xed0 net/bpf/test_run.c:666 bpf_prog_test_run kernel/bpf/syscall.c:3349 [inline] __sys_bpf+0x3ca4/0xa3c0 kernel/bpf/syscall.c:4651 __do_sys_bpf kernel/bpf/syscall.c:4737 [inline] __se_sys_bpf kernel/bpf/syscall.c:4735 [inline] __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:4735 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae write to 0xffff888131eae160 of 8 bytes by task 12503 on cpu 0: iptunnel_xmit_stats include/net/ip_tunnels.h:460 [inline] iptunnel_xmit+0x481/0x500 net/ipv4/ip_tunnel_core.c:87 ip_tunnel_xmit+0xf79/0x1210 net/ipv4/ip_tunnel.c:810 __gre_xmit net/ipv4/ip_gre.c:471 [inline] ipgre_xmit+0x553/0x5a0 net/ipv4/ip_gre.c:658 __netdev_start_xmit include/linux/netdevice.h:4994 [inline] netdev_start_xmit include/linux/netdevice.h:5008 [inline] xmit_one+0x105/0x2f0 net/core/dev.c:3590 dev_hard_start_xmit net/core/dev.c:3606 [inline] __dev_queue_xmit+0x869/0xf70 net/core/dev.c:4229 dev_queue_xmit+0x13/0x20 net/core/dev.c:4262 __bpf_tx_skb net/core/filter.c:2114 [inline] __bpf_redirect_no_mac net/core/filter.c:2139 [inline] __bpf_redirect+0x5a2/0x840 net/core/filter.c:2162 ____bpf_clone_redirect net/core/filter.c:2429 [inline] bpf_clone_redirect+0x168/0x1c0 net/core/filter.c:2401 ___bpf_prog_run+0xc87/0x30c0 kernel/bpf/core.c:1558 __bpf_prog_run512+0x70/0xa0 kernel/bpf/core.c:1786 bpf_dispatcher_nop_func include/linux/bpf.h:727 [inline] __bpf_prog_run include/linux/filter.h:626 [inline] bpf_prog_run include/linux/filter.h:633 [inline] bpf_test_run+0x18b/0x400 net/bpf/test_run.c:120 bpf_prog_test_run_skb+0x73d/0xed0 net/bpf/test_run.c:666 bpf_prog_test_run kernel/bpf/syscall.c:3349 [inline] __sys_bpf+0x3ca4/0xa3c0 kernel/bpf/syscall.c:4651 __do_sys_bpf kernel/bpf/syscall.c:4737 [inline] __se_sys_bpf kernel/bpf/syscall.c:4735 [inline] __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:4735 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000000752 -> 0x0000000000000753 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 12503 Comm: syz-executor.0 Not tainted 5.16.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================