================================================================== BUG: KCSAN: data-race in vti_tunnel_xmit / vti_tunnel_xmit read-write to 0xffff888133ba31b8 of 8 bytes by task 28441 on cpu 0: vti_tunnel_xmit+0x65e/0xad0 net/ipv4/ip_vti.c:304 __netdev_start_xmit include/linux/netdevice.h:4805 [inline] netdev_start_xmit include/linux/netdevice.h:4819 [inline] xmit_one+0xc0/0x2a0 net/core/dev.c:3590 dev_hard_start_xmit+0x72/0x120 net/core/dev.c:3606 __dev_queue_xmit+0x84c/0xfe0 net/core/dev.c:4256 dev_queue_xmit include/linux/netdevice.h:2994 [inline] __bpf_tx_skb net/core/filter.c:2114 [inline] __bpf_redirect_no_mac net/core/filter.c:2139 [inline] __bpf_redirect+0x55a/0x820 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+0x278/0x2da0 kernel/bpf/core.c:1813 __bpf_prog_run512+0x70/0xa0 kernel/bpf/core.c:2038 bpf_dispatcher_nop_func include/linux/bpf.h:903 [inline] __bpf_prog_run include/linux/filter.h:594 [inline] bpf_prog_run include/linux/filter.h:601 [inline] bpf_test_run+0x1eb/0x410 net/bpf/test_run.c:402 bpf_prog_test_run_skb+0x76b/0x9f0 net/bpf/test_run.c:1141 bpf_prog_test_run+0x22a/0x250 kernel/bpf/syscall.c:3620 __sys_bpf+0x3c4/0x630 kernel/bpf/syscall.c:4972 __do_sys_bpf kernel/bpf/syscall.c:5058 [inline] __se_sys_bpf kernel/bpf/syscall.c:5056 [inline] __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:5056 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read-write to 0xffff888133ba31b8 of 8 bytes by task 28442 on cpu 1: vti_tunnel_xmit+0x65e/0xad0 net/ipv4/ip_vti.c:304 __netdev_start_xmit include/linux/netdevice.h:4805 [inline] netdev_start_xmit include/linux/netdevice.h:4819 [inline] xmit_one+0xc0/0x2a0 net/core/dev.c:3590 dev_hard_start_xmit+0x72/0x120 net/core/dev.c:3606 __dev_queue_xmit+0x84c/0xfe0 net/core/dev.c:4256 dev_queue_xmit include/linux/netdevice.h:2994 [inline] __bpf_tx_skb net/core/filter.c:2114 [inline] __bpf_redirect_no_mac net/core/filter.c:2139 [inline] __bpf_redirect+0x55a/0x820 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+0x278/0x2da0 kernel/bpf/core.c:1813 __bpf_prog_run512+0x70/0xa0 kernel/bpf/core.c:2038 bpf_dispatcher_nop_func include/linux/bpf.h:903 [inline] __bpf_prog_run include/linux/filter.h:594 [inline] bpf_prog_run include/linux/filter.h:601 [inline] bpf_test_run+0x1eb/0x410 net/bpf/test_run.c:402 bpf_prog_test_run_skb+0x76b/0x9f0 net/bpf/test_run.c:1141 bpf_prog_test_run+0x22a/0x250 kernel/bpf/syscall.c:3620 __sys_bpf+0x3c4/0x630 kernel/bpf/syscall.c:4972 __do_sys_bpf kernel/bpf/syscall.c:5058 [inline] __se_sys_bpf kernel/bpf/syscall.c:5056 [inline] __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:5056 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x000000000000cd51 -> 0x000000000000cd53 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 28442 Comm: syz-executor.5 Not tainted 5.19.0-syzkaller-07280-gb44f2fd87919-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 ==================================================================