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

read-write to 0xffff88811a824b86 of 2 bytes by task 31249 on cpu 0:
 __tipc_sendstream+0x7c0/0xb10 net/tipc/socket.c:1628
 tipc_sendstream+0x3e/0x60 net/tipc/socket.c:1546
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg+0x140/0x180 net/socket.c:733
 sock_write_iter+0x186/0x1c0 net/socket.c:1137
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x79b/0x950 fs/read_write.c:684
 ksys_write+0xeb/0x1b0 fs/read_write.c:736
 __do_sys_write fs/read_write.c:747 [inline]
 __se_sys_write fs/read_write.c:744 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:744
 x64_sys_call+0x2a45/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811a824b86 of 2 bytes by task 31245 on cpu 1:
 tsk_conn_cong net/tipc/socket.c:222 [inline]
 tipc_poll+0x1f6/0x360 net/tipc/socket.c:806
 sock_poll+0x22d/0x250 net/socket.c:1386
 vfs_poll include/linux/poll.h:82 [inline]
 io_poll_check_events io_uring/poll.c:262 [inline]
 io_poll_task_func+0x147/0xa80 io_uring/poll.c:318
 io_handle_tw_list+0xe5/0x210 io_uring/io_uring.c:1059
 tctx_task_work_run+0x6e/0x1c0 io_uring/io_uring.c:1123
 tctx_task_work+0x44/0x80 io_uring/io_uring.c:1141
 task_work_run+0x13c/0x1b0 kernel/task_work.c:227
 get_signal+0xe81/0x1000 kernel/signal.c:2808
 arch_do_signal_or_restart+0x9a/0x4b0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x62/0x120 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0186 -> 0x01c7

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 31245 Comm: syz.1.10230 Not tainted 6.14.0-syzkaller-03576-g1e1ba8d23dae #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================