syzbot

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BUG: KCSAN: data-race in ip6_tnl_start_xmit / ip6_tnl_start_xmit

read-write to 0xffff888135d28168 of 8 bytes by task 22103 on cpu 1:
 ip6_tnl_start_xmit+0x883/0xa90 net/ipv6/ip6_tunnel.c:1444
 __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:4255
 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+0x556/0x840 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+0x278/0x2da0 kernel/bpf/core.c:1852
 __bpf_prog_run512+0x70/0xa0 kernel/bpf/core.c:2077
 bpf_dispatcher_nop_func include/linux/bpf.h:869 [inline]
 __bpf_prog_run include/linux/filter.h:628 [inline]
 bpf_prog_run include/linux/filter.h:635 [inline]
 bpf_test_run+0x1eb/0x410 net/bpf/test_run.c:402
 bpf_prog_test_run_skb+0x76b/0x9f0 net/bpf/test_run.c:1155
 bpf_prog_test_run+0x22a/0x250 kernel/bpf/syscall.c:3591
 __sys_bpf+0x3c4/0x630 kernel/bpf/syscall.c:4935
 __do_sys_bpf kernel/bpf/syscall.c:5021 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5019 [inline]
 __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:5019
 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 0xffff888135d28168 of 8 bytes by task 22104 on cpu 0:
 ip6_tnl_start_xmit+0x883/0xa90 net/ipv6/ip6_tunnel.c:1444
 __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:4255
 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+0x556/0x840 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+0x278/0x2da0 kernel/bpf/core.c:1852
 __bpf_prog_run512+0x70/0xa0 kernel/bpf/core.c:2077
 bpf_dispatcher_nop_func include/linux/bpf.h:869 [inline]
 __bpf_prog_run include/linux/filter.h:628 [inline]
 bpf_prog_run include/linux/filter.h:635 [inline]
 bpf_test_run+0x1eb/0x410 net/bpf/test_run.c:402
 bpf_prog_test_run_skb+0x76b/0x9f0 net/bpf/test_run.c:1155
 bpf_prog_test_run+0x22a/0x250 kernel/bpf/syscall.c:3591
 __sys_bpf+0x3c4/0x630 kernel/bpf/syscall.c:4935
 __do_sys_bpf kernel/bpf/syscall.c:5021 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5019 [inline]
 __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:5019
 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: 0x000000000000c08a -> 0x000000000000c08c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22104 Comm: syz-executor.3 Not tainted 5.19.0-rc8-syzkaller-00105-g6e2c0490769e-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
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