127 lines
3.7 KiB
Plaintext
127 lines
3.7 KiB
Plaintext
PURPOSE of /tools/glibc/Regression/bz600457-locally-defined-symbol-resolving-failure
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Description: Test for bz600457 ([4.8] Unexpected failure of resolving a)
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Author: Petr Muller <pmuller@redhat.com>
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Bug summary: [4.8] Unexpected failure of resolving a locally-defined symbol.
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Bugzilla link: https://bugzilla.redhat.com/show_bug.cgi?id=600457
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Description:
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Customer Contact Name:
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Naoki Yanagimoto
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Description of Problem:
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This problem is the same as issue #580553 of RHEL5.
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This ticket is for RHEL4.
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We hit a failure of resolving a symbol which is locally defined in a library,
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in a complex case that I'll describe below.
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If the dynamic linker, glibc or something else has a bug in it, please fix it.
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If we did something wrong on creating a program, please point it out.
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We wrote a program that consists of an executable file and four libraries.
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The executable file a.out requires two libraries, libA and libX.
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The library libA requires another library libB.
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The library libB requires another library libC.
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The program operates in the following steps.
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+------+ +-------+ +------+ +------+ +-----------------------------------+
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| libX | (2) | a.out | (1) | libA |----| libB |------| libC (5) (7) |
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| | <=== | (8) | ===> | | | | <=== | atexit(libC_fini)--> _libC_fini() |
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+------+ (3) +-------+ (6) +------+ +------+ (4) +-----------------------------------+
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(1) a.out calls dlopen() for libA.
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libB and libC shall be loaded, too.
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(2) a.out calls dlopen() for libX.
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(3) a.out calls dlclose() for libX.
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(4) libC calls dlopen() for libB.
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(5) libC calls atexit() to register libC_fini().
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(6) a.out calls dlclose() for libA.
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libB and libC are no longer needed, so both libraries shall be getting unloaded.
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(7) libC_fini() shall be called when libC is getting unloaded.
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(8) a.out exits.
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But when we run the program, unexpectedly
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a) step (7) is executed _after_ step (8)
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b) libC cannot resolve a locally-defined symbol _libC_fini at executing (7)
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Version-Release number of selected component:
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- Red Hat Enterprise Linux Version Number: 4
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- Release Number: 8
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- Architecture: x86
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- Kernel Version: 2.6.9-89.ELsmp
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- Related Package Version: glibc-2.3.4-2.43.el4_8.2
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- Related Middleware / Application: None
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Drivers or hardware or architecture dependency:
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None.
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How reproducible:
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always.
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Step to Reproduce:
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1) Extract the reproducer.
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$ tar zxvf reproducer.tar.gz
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2) Compile it.
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$ cd reproducer
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$ make
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3) Run it.
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$ ./run.sh
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Actual Results:
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$ ./run.sh
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1)main:dlopen libA.so
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2)main:dlopen libX.so
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3)main:dlclose libX.so
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4)libC:dlopen libB.so
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5)libC:atexit(libC_fini)
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6)main:dlclose libA.so
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8)main:finish main
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./main: symbol lookup error: ./libC.so: undefined symbol: _libC_fini
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Expected Results:
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$ ./run.sh
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1)main:dlopen libA.so
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2)main:dlopen libX.so
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3)main:dlclose libX.so
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4)libC:dlopen libB.so
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5)libC:atexit(libC_fini)
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6)main:dlclose libA.so
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7)libC:finish - atexit()
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8)main:finish main
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Summary of actions taken to resolve issue:
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None.
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Location of diagnostic data:
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None.
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Hardware configuration:
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Model: PRIMERGY RX300 S5
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CPU Info: Xeon(R) 2.27GHz x2
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Memory Info: 3GB
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Hardware Component Information: None
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Configuration Info: None
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Guest Configuration Info: None
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Business Impact:
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The application suffering this issue cannot call the function registered
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by atexit() because of the failure of resolving its symbol. It causes two
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severe problems, a) the failure of cooperation with other processes by
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notifying them of its completion, and b) the system resource leaks by not
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freeing them.
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Target Release: 4.9
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Errata Request: async errata for 4.8
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Hotfix Request: None.
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Additional Info:
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Sosreport and reproducer are attached.
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This is the same bug as IT #580553 https://bugzilla.redhat.com/show_bug.cgi?id=593675 (RHEL5)
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