fix_core_name: enable core pid

.travis.yml

@@ -17,6 +17,7 @@ env:
 
 before_script:
 - ulimit -c unlimited -S       # enable core dumps
+- sudo echo "1" > /proc/sys/kernel/core_uses_pid
 
 before_install:
 - wget --no-clobber https://github.com/bazelbuild/bazel/releases/download/0.25.1/bazel_0.25.1-linux-x86_64.deb && sudo dpkg -i bazel_0.25.1-linux-x86_64.deb

test/run_tests.sh

@@ -23,10 +23,6 @@ rc=0
 test_bins="test_butil test_bvar bthread*unittest brpc*unittest"
 ulimit -c unlimited # turn on coredumps
 for test_bin in $test_bins; do
-    # test_butil would generate core file due to ASSERT_DEATH and still be passed.
-    # The core file should be removed first otherwise other core would not be
-    # generated.
-    rm -rf core*
     test_num=$((test_num + 1))
     >&2 echo "[runtest] $test_bin"
     ./$test_bin