On linux, VM issue Error msg with option -Xrun when try to execute any .class,
the ldd result of libdbx_agent.so should not have any effect on the VM error,
I have same undefined symbols on sparc-S2, but sparc-S2 VM works fine.

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to reproduce :

35> java -Xdebug -Xnoagent -Xrundbx_agent -classpath . jdisp
 Error occurred during initialization of VM
 Could not find -Xrun library: libdbx_agent.so
36> env | grep LD
 LD_LIBRARY_PATH=.:/set/gnu/local/lib:/set/gnu/local/lib/sparcv9:./:/net/ryan1/export/jeanko/ws/dbx74/dev/Derived-intel-Linux-debug/src/dbx/../lib/dbxruntime
37> ls /net/ryan1/export/jeanko/ws/dbx74/dev/Derived-intel-Linux-debug/src/dbx/../lib/dbxruntime
 libcollector.so@ librtc.so@ rtcaudit.so@
 libdbx_agent.so* rtcapihook.so@ rtcboot.so@
38> echo $host
 pirandello
39> uname -a
 Linux pirandello 2.4.19-64GB-SMP #1 SMP Tue Nov 11 15:45:26 UTC 2003 i686 unknown
40> java -version
 java version "1.4.2_02"
 Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_02-b03)
 Java HotSpot(TM) Client VM (build 1.4.2_02-b03, mixed mode)
 
40> ldd -r libdbx_agent.so
        libstdc++.so.5 => /usr/lib/libstdc++.so.5 (0x4003c000)
        libm.so.6 => /lib/i686/libm.so.6 (0x400f1000)
        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x40114000)
        libc.so.6 => /lib/i686/libc.so.6 (0x4011c000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)
undefined symbol: thr_self (./libdbx_agent.so)
undefined symbol: sema_post (./libdbx_agent.so)
undefined symbol: sem_init (./libdbx_agent.so)
undefined symbol: sema_wait (./libdbx_agent.so)
undefined symbol: sema_destroy (./libdbx_agent.so)
undefined symbol: .L173 (./libdbx_agent.so)