syzbot

==================================================================
BUG: KCSAN: data-race in tipc_poll / tipc_sk_proto_rcv

read-write to 0xffff88810379b786 of 2 bytes by task 15390 on cpu 0:
 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:1017 [inline]
 sock_recvmsg+0x136/0x170 net/socket.c:1039
 ____sys_recvmsg+0xf5/0x280 net/socket.c:2786
 ___sys_recvmsg+0x11f/0x370 net/socket.c:2828
 __sys_recvmsg net/socket.c:2861 [inline]
 __do_sys_recvmsg net/socket.c:2867 [inline]
 __se_sys_recvmsg net/socket.c:2864 [inline]
 __x64_sys_recvmsg+0xd1/0x160 net/socket.c:2864
 x64_sys_call+0xf19/0x2fb0 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 0xffff88810379b786 of 2 bytes by task 15403 on cpu 1:
 tsk_conn_cong net/tipc/socket.c:222 [inline]
 tipc_poll+0x1f9/0x350 net/tipc/socket.c:806
 sock_poll+0x218/0x240 net/socket.c:1379
 vfs_poll include/linux/poll.h:82 [inline]
 __io_arm_poll_handler+0x1ee/0xb70 io_uring/poll.c:583
 io_arm_poll_handler+0x427/0x590 io_uring/poll.c:708
 io_queue_async+0x60/0x3a0 io_uring/io_uring.c:1950
 io_queue_sqe io_uring/io_uring.c:1976 [inline]
 io_submit_sqe io_uring/io_uring.c:2225 [inline]
 io_submit_sqes+0xa25/0xfd0 io_uring/io_uring.c:2338
 __do_sys_io_uring_enter io_uring/io_uring.c:3405 [inline]
 __se_sys_io_uring_enter+0x1c1/0x1b70 io_uring/io_uring.c:3339
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3339
 x64_sys_call+0x28c8/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:427
 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: 0x0216 -> 0x0194

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 15403 Comm: syz.2.2826 Not tainted 6.16.0-rc4-syzkaller-00013-g66701750d556 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
==================================================================