Modular Debugger
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The modular debugger (mdb) is an extensible, low-level debugger used on all operating systems that are based on the open sourced Solaris operating system, such as Illumos, for post-mortem analysis of an application or kernel. The mdb project was started inside of Sun to replace the aging adb debugger (made by Steve Bourne) that was previously used with the system. Mdb is backward-compatible with adb.