linux-kernel - [PATCH 3/4] selftests: ublk: kublk: ignore SIGCHLD

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Message-Id: <20250325-ublk_timeout-v1-3-262f0121a7bd@purestorage.com>
Date: Tue, 25 Mar 2025 16:19:33 -0600
From: Uday Shankar <ushankar@...estorage.com>
To: Ming Lei <ming.lei@...hat.com>, Shuah Khan <shuah@...nel.org>, 
 Jens Axboe <axboe@...nel.dk>
Cc: linux-block@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Uday Shankar <ushankar@...estorage.com>
Subject: [PATCH 3/4] selftests: ublk: kublk: ignore SIGCHLD

SIGCHLD from exiting children can arrive during io_uring_wait_cqe and
cause it to return early with -EINTR. Since we don't have a handler for
SIGCHLD, avoid this issue by ignoring SIGCHLD.

Signed-off-by: Uday Shankar <ushankar@...estorage.com>
---
 tools/testing/selftests/ublk/kublk.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/ublk/kublk.c b/tools/testing/selftests/ublk/kublk.c
index ded1b93e7913011499ae5dae7b40f0e425982ee4..064a5bb6f12f35892065b8dfacb6f57f6fc16aee 100644
--- a/tools/testing/selftests/ublk/kublk.c
+++ b/tools/testing/selftests/ublk/kublk.c
@@ -890,6 +890,7 @@ static int cmd_dev_add(struct dev_ctx *ctx)
 		exit(-1);
 	}
 
+	signal(SIGCHLD, SIG_IGN);
 	setsid();
 	res = fork();
 	if (res == 0) {

-- 
2.34.1