[Bug runtime/12645] New: exelib.exp failures (and hung stapio's) on s390x

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

http://sourceware.org/bugzilla/show_bug.cgi?id=12645

           Summary: exelib.exp failures (and hung stapio's) on s390x
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: dsmith@redhat.com


kernel: 2.6.32-125.el6.s390x

On s390x, the exelib.exp testcase gets 72 passes and 124 unexpected failures. 
Even though commit 273e7bf updated that test to kill stap when the test fails,
9 stapio processes get left behind:

# ps x | fgrep stapio
10937 ?        Rl     8:23 /usr/local/libexec/systemtap/stapio -w -c
./uprobesgcc-O3default-debug-uprobeslibgcc-O3default-prelink-debug_exe -u
/tmp/stapz81ubu/stap_3124cb608964f80ab49b78d36c0d613e_10311.ko
11387 ?        Rl     7:19 /usr/local/libexec/systemtap/stapio -w -c
./uprobesgcc-O3default-sep-debug-uprobeslibgcc-O3default-prelink-debug_exe -u
/tmp/stapbnXVPL/stap_e0453cf16865566fe0db1126fc5ba817_10371.ko
11851 ?        Rl     6:25 /usr/local/libexec/systemtap/stapio -w -c
./uprobesgcc-O3default-pie-debug-uprobeslibgcc-O3default-prelink-debug_exe -u
/tmp/stapuhQmTJ/stap_2b7361788bf0f1ab00a7ef97d97882f7_10325.ko
12324 ?        Rl     5:35 /usr/local/libexec/systemtap/stapio -w -c
./uprobesgcc-O3default-pie-sep-debug-uprobeslibgcc-O3default-prelink-debug_exe
-u /tmp/stapsFzAmD/stap_632f491261ce1ffd759ac0b8972667fd_10385.ko
14581 ?        Rl     4:08 /usr/local/libexec/systemtap/stapio -w -c
./uprobesgcc-O3default-debug-uprobeslibgcc-O3default-prelink-sep-debug-after_exe
-u /tmp/stapMqlmmN/stap_23d8e70dafb27f52d8aebd7623048c1d_10611.ko
15030 ?        Rl     3:39 /usr/local/libexec/systemtap/stapio -w -c
./uprobesgcc-O3default-sep-debug-uprobeslibgcc-O3default-prelink-sep-debug-after_exe
-u /tmp/stapz9fPix/stap_aaca3cde249673e0a0f3f3a5f00d5004_10671.ko
15480 ?        Rl     3:07 /usr/local/libexec/systemtap/stapio -w -c
./uprobesgcc-O3default-pie-debug-uprobeslibgcc-O3default-prelink-sep-debug-after_exe
-u /tmp/stap1Hv065/stap_bda7ff911f65c3a752b4db9772267f9b_10625.ko
15931 ?        Rl     2:41 /usr/local/libexec/systemtap/stapio -w -c
./uprobesgcc-O3default-pie-sep-debug-uprobeslibgcc-O3default-prelink-sep-debug-after_exe
-u /tmp/stap53sDwo/stap_1753fc2af1aad9dd913c37c6957f6bf0_10685.ko

These stapio processes cannot be killed (even a 'kill -9' fails).  The modules
left behind are all "in use", so they cannot be removed.  The stapio processes
stay in the running state.

Even if this testcase (and related user-space probing) fail, stap should exit
cleanly and not leave behind these stuck stapio process and modules.

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