NAME

       error::pass5 - systemtap pass-5 errors

DESCRIPTION

       Errors that occur during pass 5 (execution) can have a variety of causes.

       exceptional events during script execution
              The  systemtap  translator  and  runtime  include numerous error checks that aim to
              protect the systems and the users  from  mistakes  or  transient  conditions.   The
              script may deliberately call the error() tapset function to signal a problem.  Some
              memory needed for accessing $context  variables  may  be  temporarily  unavailable.
              Consider  using  the  try/catch  construct  to  wrap script fragments in exception-
              handling code.  Consider using the stap --suppress-handler-errors or  stap  --skip-
              badvars option.

       resource exhaustion
              One  of  several  types  of  space  or  time resource limits may be exceeded by the
              script, including system overload, too many tuples to be stored in an  array,  etc.
              Some  of  the  error  messages  identify the constraint by macro name, which may be
              individually raised.  Consider using the stap --suppress-handler-errors and/or stap
              -g  --suppress-time-limits  options.   Extend or disable individual resource limits
              using the stap -DSOME_LIMIT=NNNN option.

       remote execution server problems
              If you use the stap --remote option to direct a systemtap  script  to  be  executed
              somewhere  else,  ensure that an SSH connection may be made to the remote host, and
              that it has the current systemtap runtime installed & available.

       installation/permission problems
              It is possible that your installation of systemtap  was  not  correctly  installed.
              For   example,   the   /usr/bin/staprun  program  may  lack  the  necessary  setuid
              permissions, or your invoking userid might not have sufficient privileges (root, or
              stapusr  and  related group memberships).  Environment variables may interfere with
              locating /usr/libexec/.../stapio.

       errors from target program
              The program invoked by the stap -c CMD option may exit with a non-zero code.

       uncaught exceptions in the target program
              When using --runtime=dyninst you may encounter an issue where  the  target  program
              aborts  with  a  message  like  "terminate  called  after  throwing  an instance of
              'foo_exception'".  This is unfortunately a limitation of Dyninst,  which  sometimes
              prevents exceptions from properly unwinding through instrumented code.

GATHERING MORE INFORMATION

       Increasing the verbosity of pass-5 with an option such as --vp 00001 can help pinpoint the
       problem.

SEE ALSO

       stap(1),
       http://sourceware.org/systemtap/wiki/TipExhaustedResourceErrors,
       error::fault(7stap),
       error::reporting(7stap)

                                                                              ERROR::PASS5(7stap)