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BUG: KCSAN: data-race in __tipc_sendstream / tipc_poll

write to 0xffff88812b10ef86 of 2 bytes by task 31862 on cpu 0:
 __tipc_sendstream+0x80b/0xb40 net/tipc/socket.c:1629
 tipc_sendstream+0x3a/0x50 net/tipc/socket.c:1547
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 sock_write_iter+0x1a3/0x200 net/socket.c:1057
 call_write_iter include/linux/fs.h:2162 [inline]
 new_sync_write fs/read_write.c:503 [inline]
 vfs_write+0x7f5/0x950 fs/read_write.c:590
 ksys_write+0xd9/0x190 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:652
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88812b10ef86 of 2 bytes by task 31945 on cpu 1:
 tsk_conn_cong net/tipc/socket.c:224 [inline]
 tipc_poll+0x1d9/0x340 net/tipc/socket.c:807
 sock_poll+0x23e/0x260 net/socket.c:1302
 vfs_poll include/linux/poll.h:90 [inline]
 do_select+0x797/0xea0 fs/select.c:534
 core_sys_select+0x440/0x6d0 fs/select.c:677
 do_pselect fs/select.c:759 [inline]
 __do_sys_pselect6+0x1ea/0x250 fs/select.c:800
 __se_sys_pselect6 fs/select.c:791 [inline]
 __x64_sys_pselect6+0x74/0x80 fs/select.c:791
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0145 -> 0x0186

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 31945 Comm: syz-executor.4 Tainted: G S                5.16.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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