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torture: Make kvm-remote print diagnostics on initial ssh failure

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Currently, if the initial ssh fails, kvm-remote.sh gives up, printing a
message saying so.  But it would be nice to get a better idea as to why
ssh failed.  This commit therefore dumps out ssh's exit code, stdout,
and stderr upon ssh failure for diagnostic purposes.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney
2023-06-15 20:11:21 -07:00
parent dd3ffd125f
commit 80021ffb68
1 changed files with 9 additions and 3 deletions
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12
tools/testing/selftests/rcutorture/bin/kvm-remote.sh
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@@ -137,14 +137,20 @@ chmod +x $T/bin/kvm-remote-*.sh
# Check first to avoid the need for cleanup for system-name typos
for i in $systems
do
ncpus="`ssh -o BatchMode=yes $i getconf _NPROCESSORS_ONLN 2> /dev/null`"
ssh -o BatchMode=yes $i getconf _NPROCESSORS_ONLN > $T/ssh.stdout 2> $T/ssh.stderr
ret=$?
if test "$ret" -ne 0
then
echo System $i unreachable, giving up. | tee -a "$oldrun/remote-log"
echo "System $i unreachable ($ret), giving up." | tee -a "$oldrun/remote-log"
echo ' --- ssh stdout: vvv' | tee -a "$oldrun/remote-log"
cat $T/ssh.stdout | tee -a "$oldrun/remote-log"
echo ' --- ssh stdout: ^^^' | tee -a "$oldrun/remote-log"
echo ' --- ssh stderr: vvv' | tee -a "$oldrun/remote-log"
cat $T/ssh.stderr | tee -a "$oldrun/remote-log"
echo ' --- ssh stderr: ^^^' | tee -a "$oldrun/remote-log"
exit 4
fi
echo $i: $ncpus CPUs " " `date` | tee -a "$oldrun/remote-log"
echo $i: `cat $T/ssh.stdout` CPUs " " `date` | tee -a "$oldrun/remote-log"
done
# Download and expand the tarball on all systems.