[Bug uprobes/15981] New: inode-uprobes breaking userspace app

[dsmith at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=15981

            Bug ID: 15981
           Summary: inode-uprobes breaking userspace app
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: uprobes
          Assignee: systemtap at sourceware dot org
          Reporter: dsmith at redhat dot com

On rawhide (3.12.0-0.rc2.git0.1.fc21.x86_64), the bz6850.exp testcase fails:

====
Running ../../src/testsuite/systemtap.base/bz6850.exp ...
PASS: bz6850 compile
starting ../../src/testsuite/systemtap.base/bz6850.stp 
spawn1 stap -p4 ../../src/testsuite/systemtap.base/bz6850.stp 
spawn stap -p4 ../../src/testsuite/systemtap.base/bz6850.stp
/discer.farm/es/scratch/dsmith/systemtap/rawhide-64/testsuite/.systemtap-dsmith/cache/2a/stap_2a1b058aebac8d36361590ecabd4e329_6092.ko
/discer.farm/es/scratch/dsmith/systemtap/rawhide-64/testsuite/.systemtap-dsmith/cache/2a/stap_2a1b058aebac8d36361590ecabd4e329_6092.ko
wait results: 2007 exp6 0 0
PASS: bz6850 -p4
spawn stap ../../src/testsuite/systemtap.base/bz6850.stp -c ./bz6850
main called
fork_and_exec1 called
fork_and_exec2 called
fork1 called
fork2 called
fork1 returns
fork_and_exec2 returns
fork_and_exec1 returns
main returns
FAIL: bz6850 -p5
====

The testcase is failing because the test executable isn't writing out a marker
file after the fork. If not pobed with uprobes, this works just fine.

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