[Bug runtime/17393] New: java.exp: ERROR: Cannot attach to module control channel

["mcermak at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17393

            Bug ID: 17393
           Summary: java.exp: ERROR: Cannot attach to module control
                    channel
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: mcermak at redhat dot com

Running java.exp's singleparam.stp repeatedly on f20 shows that from time to
time (~ 50% of runs in my case) the testcase fails. In that case the testcase
produces an error and a zombie systemtap module is left in the kernel. This
never happens when stap is run in the verbose mode (-v). In verbose mode the
testcase seems to always pass:

=======
# lsmod | grep stap
# stap systemtap.apps/singleparam.stp -c "java singleparam >/dev/null 2>&1"
java("singleparam").class("singleparam").method("printMessage(int)") 42
java("singleparam").class("singleparam").method("printMessage(long)") 254775806
java("singleparam").class("singleparam").method("printMessage(double)") 3
java("singleparam").class("singleparam").method("printMessage(float)") 2345987
java("singleparam").class("singleparam").method("printMessage(byte)") 10
java("singleparam").class("singleparam").method("printMessage(boolean)") 1
java("singleparam").class("singleparam").method("printMessage(char)") 97
java("singleparam").class("singleparam").method("printMessage(short)") 14
ERROR: Cannot attach to module stap_eb60c788b3b733806a89b60e3c953452_14967
control channel; not running?
ERROR: 'stap_eb60c788b3b733806a89b60e3c953452_14967' is not a zombie systemtap
module.
WARNING: /usr/bin/staprun exited with status: 1
Pass 5: run failed.  [man error::pass5]
# lsmod | grep stap
stap_eb60c788b3b733806a89b60e3c953452_14967   178071  0 
# lsmod | grep stap | awk '{print $1}' | xargs rmmod
# lsmod | grep stap
# stap systemtap.apps/singleparam.stp -c "java singleparam >/dev/null 2>&1"
java("singleparam").class("singleparam").method("printMessage(int)") 42
java("singleparam").class("singleparam").method("printMessage(long)") 254775806
java("singleparam").class("singleparam").method("printMessage(double)") 3
java("singleparam").class("singleparam").method("printMessage(float)") 2345987
java("singleparam").class("singleparam").method("printMessage(byte)") 10
java("singleparam").class("singleparam").method("printMessage(boolean)") 1
java("singleparam").class("singleparam").method("printMessage(char)") 97
java("singleparam").class("singleparam").method("printMessage(short)") 14
# lsmod | grep stap
# stap systemtap.apps/singleparam.stp -c "java singleparam >/dev/null 2>&1"
java("singleparam").class("singleparam").method("printMessage(int)") 42
java("singleparam").class("singleparam").method("printMessage(long)") 254775806
java("singleparam").class("singleparam").method("printMessage(double)") 3
java("singleparam").class("singleparam").method("printMessage(float)") 2345987
java("singleparam").class("singleparam").method("printMessage(byte)") 10
java("singleparam").class("singleparam").method("printMessage(boolean)") 1
java("singleparam").class("singleparam").method("printMessage(char)") 97
java("singleparam").class("singleparam").method("printMessage(short)") 14
ERROR: Cannot attach to module stap_eb60c788b3b733806a89b60e3c953452_16114
control channel; not running?
ERROR: 'stap_eb60c788b3b733806a89b60e3c953452_16114' is not a zombie systemtap
module.
WARNING: /usr/bin/staprun exited with status: 1
Pass 5: run failed.  [man error::pass5]
# lsmod | grep stap
stap_eb60c788b3b733806a89b60e3c953452_16114   178071  0 
# lsmod | grep stap | awk '{print $1}' | xargs rmmod
# lsmod | grep stap
# stap systemtap.apps/singleparam.stp -c "java singleparam >/dev/null 2>&1"
java("singleparam").class("singleparam").method("printMessage(int)") 42
java("singleparam").class("singleparam").method("printMessage(long)") 254775806
java("singleparam").class("singleparam").method("printMessage(double)") 3
java("singleparam").class("singleparam").method("printMessage(float)") 2345987
java("singleparam").class("singleparam").method("printMessage(byte)") 10
java("singleparam").class("singleparam").method("printMessage(boolean)") 1
java("singleparam").class("singleparam").method("printMessage(char)") 97
java("singleparam").class("singleparam").method("printMessage(short)") 14
# lsmod | grep stap
# stap systemtap.apps/singleparam.stp -c "java singleparam >/dev/null 2>&1"
java("singleparam").class("singleparam").method("printMessage(int)") 42
java("singleparam").class("singleparam").method("printMessage(long)") 254775806
java("singleparam").class("singleparam").method("printMessage(double)") 3
java("singleparam").class("singleparam").method("printMessage(float)") 2345987
java("singleparam").class("singleparam").method("printMessage(byte)") 10
java("singleparam").class("singleparam").method("printMessage(boolean)") 1
java("singleparam").class("singleparam").method("printMessage(char)") 97
java("singleparam").class("singleparam").method("printMessage(short)") 14
ERROR: Cannot attach to module stap_eb60c788b3b733806a89b60e3c953452_17261
control channel; not running?
ERROR: 'stap_eb60c788b3b733806a89b60e3c953452_17261' is not a zombie systemtap
module.
WARNING: /usr/bin/staprun exited with status: 1
Pass 5: run failed.  [man error::pass5]
# lsmod | grep stap
stap_eb60c788b3b733806a89b60e3c953452_17261   178071  0 
# lsmod | grep stap | awk '{print $1}' | xargs rmmod
# lsmod | grep stap
# stap systemtap.apps/singleparam.stp -c "java singleparam >/dev/null 2>&1"
java("singleparam").class("singleparam").method("printMessage(int)") 42
java("singleparam").class("singleparam").method("printMessage(long)") 254775806
java("singleparam").class("singleparam").method("printMessage(double)") 3
java("singleparam").class("singleparam").method("printMessage(float)") 2345987
java("singleparam").class("singleparam").method("printMessage(byte)") 10
java("singleparam").class("singleparam").method("printMessage(boolean)") 1
java("singleparam").class("singleparam").method("printMessage(char)") 97
java("singleparam").class("singleparam").method("printMessage(short)") 14
ERROR: Cannot attach to module stap_eb60c788b3b733806a89b60e3c953452_17838
control channel; not running?
ERROR: 'stap_eb60c788b3b733806a89b60e3c953452_17838' is not a zombie systemtap
module.
WARNING: /usr/bin/staprun exited with status: 1
Pass 5: run failed.  [man error::pass5]
#
=======

Versions used:

# uname -r; rpm -q systemtap java-1.7.0-openjdk
3.16.2-200.fc20.x86_64
systemtap-2.7-1.mcermak.b8056bd.fc20.x86_64
java-1.7.0-openjdk-1.7.0.65-2.5.2.5.fc20.x86_64
#

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