================================================================== BUG: KCSAN: data-race in iptunnel_xmit / iptunnel_xmit write to 0xffff888101dc2140 of 8 bytes by task 12581 on cpu 0: iptunnel_xmit_stats include/net/ip_tunnels.h:455 [inline] iptunnel_xmit+0x526/0x540 net/ipv4/ip_tunnel_core.c:86 ip_tunnel_xmit+0x98c/0x13c0 net/ipv4/ip_tunnel.c:818 __gre_xmit+0x38e/0x4e0 net/ipv4/ip_gre.c:448 ipgre_xmit+0x337/0x640 net/ipv4/ip_gre.c:632 __netdev_start_xmit include/linux/netdevice.h:4510 [inline] netdev_start_xmit include/linux/netdevice.h:4524 [inline] xmit_one net/core/dev.c:3470 [inline] dev_hard_start_xmit+0xeb/0x420 net/core/dev.c:3486 __dev_queue_xmit+0x14c4/0x1b80 net/core/dev.c:4063 dev_queue_xmit+0x1e/0x30 net/core/dev.c:4096 __bpf_tx_skb net/core/filter.c:2061 [inline] __bpf_redirect_common net/core/filter.c:2100 [inline] __bpf_redirect+0x4bb/0x710 net/core/filter.c:2107 ____bpf_clone_redirect net/core/filter.c:2140 [inline] bpf_clone_redirect+0x19a/0x1f0 net/core/filter.c:2112 bpf_prog_bebbfe2050753572+0xee8/0x1000 bpf_dispatcher_nopfunc include/linux/bpf.h:521 [inline] bpf_test_run+0x250/0x560 net/bpf/test_run.c:48 bpf_prog_test_run_skb+0x5f6/0xa60 net/bpf/test_run.c:388 bpf_prog_test_run kernel/bpf/syscall.c:2572 [inline] __do_sys_bpf+0xa0e/0x29c0 kernel/bpf/syscall.c:3414 __se_sys_bpf kernel/bpf/syscall.c:3355 [inline] __x64_sys_bpf+0x47/0x60 kernel/bpf/syscall.c:3355 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888101dc2140 of 8 bytes by task 12584 on cpu 1: iptunnel_xmit_stats include/net/ip_tunnels.h:455 [inline] iptunnel_xmit+0x513/0x540 net/ipv4/ip_tunnel_core.c:86 ip_tunnel_xmit+0x98c/0x13c0 net/ipv4/ip_tunnel.c:818 __gre_xmit+0x38e/0x4e0 net/ipv4/ip_gre.c:448 ipgre_xmit+0x337/0x640 net/ipv4/ip_gre.c:632 __netdev_start_xmit include/linux/netdevice.h:4510 [inline] netdev_start_xmit include/linux/netdevice.h:4524 [inline] xmit_one net/core/dev.c:3470 [inline] dev_hard_start_xmit+0xeb/0x420 net/core/dev.c:3486 __dev_queue_xmit+0x14c4/0x1b80 net/core/dev.c:4063 dev_queue_xmit+0x1e/0x30 net/core/dev.c:4096 __bpf_tx_skb net/core/filter.c:2061 [inline] __bpf_redirect_common net/core/filter.c:2100 [inline] __bpf_redirect+0x4bb/0x710 net/core/filter.c:2107 ____bpf_clone_redirect net/core/filter.c:2140 [inline] bpf_clone_redirect+0x19a/0x1f0 net/core/filter.c:2112 bpf_prog_bebbfe2050753572+0x94c/0x1000 bpf_dispatcher_nopfunc include/linux/bpf.h:521 [inline] bpf_test_run+0x250/0x560 net/bpf/test_run.c:48 bpf_prog_test_run_skb+0x5f6/0xa60 net/bpf/test_run.c:388 bpf_prog_test_run kernel/bpf/syscall.c:2572 [inline] __do_sys_bpf+0xa0e/0x29c0 kernel/bpf/syscall.c:3414 __se_sys_bpf kernel/bpf/syscall.c:3355 [inline] __x64_sys_bpf+0x47/0x60 kernel/bpf/syscall.c:3355 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 12584 Comm: syz-executor.1 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================