================================================================== BUG: KCSAN: data-race in ip_tunnel_xmit / ip_tunnel_xmit write to 0xffff8880a2c4b130 of 8 bytes by task 17405 on cpu 1: ip_tunnel_xmit+0xb28/0x11c0 net/ipv4/ip_tunnel.c:825 __gre_xmit net/ipv4/ip_gre.c:466 [inline] ipgre_xmit+0x53e/0x590 net/ipv4/ip_gre.c:650 __netdev_start_xmit include/linux/netdevice.h:4611 [inline] netdev_start_xmit include/linux/netdevice.h:4625 [inline] xmit_one+0xc0/0x310 net/core/dev.c:3556 dev_hard_start_xmit net/core/dev.c:3572 [inline] __dev_queue_xmit+0xf00/0x15a0 net/core/dev.c:4131 dev_queue_xmit+0x13/0x20 net/core/dev.c:4164 __bpf_tx_skb net/core/filter.c:2086 [inline] __bpf_redirect_no_mac net/core/filter.c:2111 [inline] __bpf_redirect+0x56a/0x7c0 net/core/filter.c:2134 ____bpf_clone_redirect net/core/filter.c:2165 [inline] bpf_clone_redirect+0x168/0x1c0 net/core/filter.c:2137 bpf_prog_e2f29814702bf05a+0x5c/0xb18 bpf_dispatcher_nop_func include/linux/bpf.h:556 [inline] bpf_test_run+0x26d/0x4a0 net/bpf/test_run.c:49 bpf_prog_test_run_skb+0x463/0xb00 net/bpf/test_run.c:459 bpf_prog_test_run kernel/bpf/syscall.c:2983 [inline] __do_sys_bpf+0x3859/0x98a0 kernel/bpf/syscall.c:4135 __se_sys_bpf kernel/bpf/syscall.c:4075 [inline] __x64_sys_bpf+0x3d/0x50 kernel/bpf/syscall.c:4075 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880a2c4b130 of 8 bytes by task 17464 on cpu 0: ip_tunnel_xmit+0xb16/0x11c0 net/ipv4/ip_tunnel.c:825 __gre_xmit net/ipv4/ip_gre.c:466 [inline] ipgre_xmit+0x53e/0x590 net/ipv4/ip_gre.c:650 __netdev_start_xmit include/linux/netdevice.h:4611 [inline] netdev_start_xmit include/linux/netdevice.h:4625 [inline] xmit_one+0xc0/0x310 net/core/dev.c:3556 dev_hard_start_xmit net/core/dev.c:3572 [inline] __dev_queue_xmit+0xf00/0x15a0 net/core/dev.c:4131 dev_queue_xmit+0x13/0x20 net/core/dev.c:4164 __bpf_tx_skb net/core/filter.c:2086 [inline] __bpf_redirect_no_mac net/core/filter.c:2111 [inline] __bpf_redirect+0x56a/0x7c0 net/core/filter.c:2134 ____bpf_clone_redirect net/core/filter.c:2165 [inline] bpf_clone_redirect+0x168/0x1c0 net/core/filter.c:2137 bpf_prog_e2f29814702bf05a+0x5c/0xb7c bpf_dispatcher_nop_func include/linux/bpf.h:556 [inline] bpf_test_run+0x26d/0x4a0 net/bpf/test_run.c:49 bpf_prog_test_run_skb+0x463/0xb00 net/bpf/test_run.c:459 bpf_prog_test_run kernel/bpf/syscall.c:2983 [inline] __do_sys_bpf+0x3859/0x98a0 kernel/bpf/syscall.c:4135 __se_sys_bpf kernel/bpf/syscall.c:4075 [inline] __x64_sys_bpf+0x3d/0x50 kernel/bpf/syscall.c:4075 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 17464 Comm: syz-executor.4 Not tainted 5.8.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================