syzbot

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BUG: KCSAN: data-race in tipc_poll / tipc_sk_proto_rcv

read-write to 0xffff888139b8368e of 2 bytes by task 22289 on cpu 1:
 tipc_sk_conn_proto_rcv net/tipc/socket.c:1367 [inline]
 tipc_sk_proto_rcv+0x66e/0xb00 net/tipc/socket.c:2156
 tipc_sk_filter_rcv+0x1812/0x1930 net/tipc/socket.c:2350
 tipc_sk_enqueue net/tipc/socket.c:2443 [inline]
 tipc_sk_rcv+0x4dc/0x1850 net/tipc/socket.c:2495
 tipc_node_xmit+0x18b/0x890 net/tipc/node.c:1701
 tipc_node_xmit_skb+0x91/0xc0 net/tipc/node.c:1766
 tipc_sk_send_ack+0x25c/0x270 net/tipc/socket.c:1824
 tipc_recvstream+0x5a9/0x780 net/tipc/socket.c:2093
 sock_recvmsg_nosec net/socket.c:1065 [inline]
 sock_recvmsg+0x139/0x170 net/socket.c:1087
 ____sys_recvmsg+0xf5/0x280 net/socket.c:2834
 ___sys_recvmsg+0x11f/0x370 net/socket.c:2876
 __sys_recvmsg net/socket.c:2909 [inline]
 __do_sys_recvmsg net/socket.c:2915 [inline]
 __se_sys_recvmsg net/socket.c:2912 [inline]
 __x64_sys_recvmsg+0xd1/0x160 net/socket.c:2912
 x64_sys_call+0x2b42/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:48
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888139b8368e of 2 bytes by task 22296 on cpu 0:
 tsk_conn_cong net/tipc/socket.c:222 [inline]
 tipc_poll+0x1f9/0x350 net/tipc/socket.c:806
 sock_poll+0x215/0x240 net/socket.c:1427
 vfs_poll include/linux/poll.h:82 [inline]
 select_poll_one fs/select.c:480 [inline]
 do_select+0x8f1/0xf50 fs/select.c:536
 core_sys_select+0x3d7/0x6e0 fs/select.c:677
 do_pselect fs/select.c:759 [inline]
 __do_sys_pselect6 fs/select.c:802 [inline]
 __se_sys_pselect6+0x216/0x280 fs/select.c:793
 __x64_sys_pselect6+0x78/0x90 fs/select.c:793
 x64_sys_call+0x28b9/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:271
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0208 -> 0x0186

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 22296 Comm: syz.4.4123 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2025
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