tests/block/014: ignore dd error messages

The kernel commit de3510e52b0a ("null_blk: fix command timeout
completion handling") fixed null_blk driver to report ETIMEDOUT errors
for IO operations failed with a timeout. This change causes the dd call
in block/014 case to print the following error message:

dd: error reading '/dev/nullb0': Connection timed out

The presence of this message result in a failure of the test case even
without a kernel crash or hang, which is what the block/014 case is
testing. Avoid this failure by ignoring dd error messages using a
redirection of dd stderr to /dev/null.

Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>

diff --git a/tests/block/014 b/tests/block/014
index 370fc3d9c899ed905a6f5ba1b490e6a6e93f100b..04c34fa12b5ce0777e8b9e0c551e926e6b608c56 100755 (executable)
--- a/tests/block/014
+++ b/tests/block/014
@@ -34,7 +34,7 @@ test() {
                # crash or hang.
                for ((i = 0; i < 100; i++)); do
                        dd if=/dev/nullb0 of=/dev/null bs=4K count=4 \
-                               iflag=direct status=none &
+                               iflag=direct status=none > /dev/null 2>&1 &
                done
                wait
        done