summary: Test for bz600457 ([4.8] Unexpected failure of resolving a)
description: |
    Bug summary: [4.8] Unexpected failure of resolving a locally-defined symbol.
    Bugzilla link: https://bugzilla.redhat.com/show_bug.cgi?id=600457

    Description:

    Customer Contact Name:
    Naoki Yanagimoto

    Description of Problem:
    This problem is the same as issue #580553 of RHEL5.
    This ticket is for RHEL4.

    We hit a failure of resolving a symbol which is locally defined in a library,
    in a complex case that I'll describe below.
    If the dynamic linker, glibc or something else has a bug in it, please fix it.
    If we did something wrong on creating a program, please point it out.

    We wrote a program that consists of an executable file and four libraries.
    The executable file a.out requires two libraries, libA and libX.
    The library libA requires another library libB.
    The library libB requires another library libC.

    The program operates in the following steps.

    +------+      +-------+      +------+    +------+      +-----------------------------------+
    | libX |  (2) | a.out | (1)  | libA |----| libB |------| libC  (5)        (7)              |
    |      | <=== |  (8)  | ===> |      |    |      | <=== | atexit(libC_fini)--> _libC_fini() |
    +------+  (3) +-------+ (6)  +------+    +------+  (4) +-----------------------------------+

    (1) a.out calls dlopen() for libA.
        libB and libC shall be loaded, too.
    (2) a.out calls dlopen() for libX.
    (3) a.out calls dlclose() for libX.
    (4) libC calls dlopen() for libB.
    (5) libC calls atexit() to register libC_fini().
    (6) a.out calls dlclose() for libA.
        libB and libC are no longer needed, so both libraries shall be getting unloaded.
    (7) libC_fini() shall be called when libC is getting unloaded.
    (8) a.out exits.

    But when we run the program, unexpectedly

    a) step (7) is executed _after_ step (8)
    b) libC cannot resolve a locally-defined symbol _libC_fini at executing (7)

    Version-Release number of selected component:
    - Red Hat Enterprise Linux Version Number: 4
    - Release Number: 8
    - Architecture: x86
    - Kernel Version: 2.6.9-89.ELsmp
    - Related Package Version: glibc-2.3.4-2.43.el4_8.2
    - Related Middleware / Application: None

    Drivers or hardware or architecture dependency:
    None.

    How reproducible:
    always.

    Step to Reproduce:
    1) Extract the reproducer.
       $ tar zxvf reproducer.tar.gz

    2) Compile it.
       $ cd reproducer
       $ make

    3) Run it.
       $ ./run.sh

    Actual Results:
    $ ./run.sh
    1)main:dlopen  libA.so
    2)main:dlopen  libX.so
    3)main:dlclose libX.so
    4)libC:dlopen  libB.so
    5)libC:atexit(libC_fini)
    6)main:dlclose libA.so
    8)main:finish main
    ./main: symbol lookup error: ./libC.so: undefined symbol: _libC_fini

    Expected Results:
    $ ./run.sh
    1)main:dlopen  libA.so
    2)main:dlopen  libX.so
    3)main:dlclose libX.so
    4)libC:dlopen  libB.so
    5)libC:atexit(libC_fini)
    6)main:dlclose libA.so
    7)libC:finish - atexit()
    8)main:finish main

    Summary of actions taken to resolve issue:
    None.

    Location of diagnostic data:
    None.

    Hardware configuration:
    Model: PRIMERGY RX300 S5
    CPU Info: Xeon(R) 2.27GHz x2
    Memory Info: 3GB
    Hardware Component Information: None
    Configuration Info: None
    Guest Configuration Info: None

    Business Impact:
    The application suffering this issue cannot call the function registered
    by atexit() because of the failure of resolving its symbol. It causes two
    severe problems, a) the failure of cooperation with other processes by
    notifying them of its completion, and b) the system resource leaks by not
    freeing them.

    Target Release: 4.9

    Errata Request: async errata for 4.8

    Hotfix Request: None.

    Additional Info:
    Sosreport and reproducer are attached.

    This is the same bug as IT #580553 https://bugzilla.redhat.com/show_bug.cgi?id=593675 (RHEL5)
contact: Petr Muller <pmuller@redhat.com>
component:
  - glibc
test: ./runtest.sh
framework: beakerlib
recommend:
  - glibc
duration: 30m
link:
  - relates: https://bugzilla.redhat.com/show_bug.cgi?id=600457
extra-summary: /tools/glibc/Regression/bz600457-locally-defined-symbol-resolving-failure
extra-task: /tools/glibc/Regression/bz600457-locally-defined-symbol-resolving-failure