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selftests/ublk: fix garbage output in foreground mode

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Initialize _evtfd to -1 in struct dev_ctx to prevent garbage output
when running kublk in foreground mode. Without this, _evtfd is
zero-initialized to 0 (stdin), and ublk_send_dev_event() writes
binary data to stdin which appears as garbage on the terminal.

Also fix debug message format string.

Fixes: 6aecda00b7 ("selftests: ublk: add kernel selftests for ublk")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Caleb Sander Mateos <csander@purestorage.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2026-01-13 16:58:02 +08:00 committed by Jens Axboe
parent 23e62cf755
commit e7e1cc18f1
1 changed files with 2 additions and 1 deletions
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3
tools/testing/selftests/ublk/kublk.c
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@ -1274,7 +1274,7 @@ static int __cmd_dev_add(const struct dev_ctx *ctx)
}
ret = ublk_start_daemon(ctx, dev);
ublk_dbg(UBLK_DBG_DEV, "%s: daemon exit %d\b", ret);
ublk_dbg(UBLK_DBG_DEV, "%s: daemon exit %d\n", __func__, ret);
if (ret < 0)
ublk_ctrl_del_dev(dev);
@ -1620,6 +1620,7 @@ int main(int argc, char *argv[])
int option_idx, opt;
const char *cmd = argv[1];
struct dev_ctx ctx = {
._evtfd = -1,
.queue_depth = 128,
.nr_hw_queues = 2,
.dev_id = -1,