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We see the following failure a few times a week: # RUN global.data_steal ... # tls.c:3280:data_steal:Expected recv(cfd, buf2, sizeof(buf2), MSG_DONTWAIT) (10000) == -1 (-1) # data_steal: Test failed # FAIL global.data_steal not ok 8 global.data_steal The 10000 bytes read suggests that the child process did a recv() of half of the data using the TLS ULP and we're now getting the remaining half. The intent of the test is to get the child to enter _TCP_ recvmsg handler, so it needs to enter the syscall before parent installed the TLS recvmsg with setsockopt(SOL_TLS). Instead of the 10msec sleep send 1 byte of data and wait for the child to consume it. Reviewed-by: Sabrina Dubroca <sd@queasysnail.net> Link: https://patch.msgid.link/20260106200205.1593915-1-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>