Subject: Debugging core dumps from Linux-emulated apps
To: None <>
From: Brian de Alwis <>
List: netbsd-users
Date: 04/16/2007 10:38:52
I'm running a Linux app on NetBSD using the Linux emulation.  The
app is dumping core, but the core dump is a NetBSD core:

    $ file bin/java java.core 
    bin/java:  ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.2.5, dynamically linked (uses shared libs), stripped
    java.core: ELF 32-bit LSB core file Intel 80386, version 1 (SYSV), NetBSD-style, from 'java' (signal 11)

(This is the jRockit JVM.)

I had thought gdb's bfd would DTRT (and tried the version from
pkgsrc), but it complains that it wasn't compiled with a Linux ABI.

    This GDB was configured as "i386--netbsdelf"...
    warning: A handler for the OS ABI "GNU/Linux" is not built into this configuration

And using a Linux GDB produces the same warning but for the NetBSD ABI.
And a quick peek didn't show me anything obvious to enable it.

Is it possible?  Has anybody done this?

(ktrace/ktruss doesn't show anything obvious.)


  Brian de Alwis | Software Practices Lab | UBC |
      "Amusement to an observing mind is study." - Benjamin Disraeli