[exec]   test_empty_backquotes:				.: (0.005730)
     [exec]   test_system_special_commands:				E
     [exec] ===============================================================================
     [exec] Error: test_system_special_commands(TestBackquote): Errno::ENOENT: No such file or directory - No such file or directory
     [exec] org/jruby/RubyProcess.java:916:in `waitpid'
     [exec] org/jruby/RubyKernel.java:1769:in `system'
     [exec] /home/travis/build/jruby/jruby/test/jruby/test_backquote.rb:33:in `test_system_special_commands'
     [exec]      30: 
     [exec]      31:   def test_system_special_commands
     [exec]      32:     if File.exists?("/bin/true")
     [exec]   => 33:       assert(system("/bin/true"))
     [exec]      34:       assert_equal(0, $?.exitstatus)
     [exec]      35:     end
     [exec]      36: 
     [exec] org/jruby/RubyKernel.java:1263:in `catch'
     [exec] org/jruby/RubyKernel.java:1258:in `catch'
     [exec] org/jruby/RubyKernel.java:1263:in `catch'
     [exec] org/jruby/RubyKernel.java:1258:in `catch'

A Fiber that has been abandoned

No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.

Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#build-times-out-because-no-output-was-received