Articles  ❯  Debugging

How to debug a segmentation fault without a core dump

April 9, 2021

In the past, I had to deal with this kind of restriction on several occasions. A segmentation fault or, more generally, abnormal process termination had to be investigated with the caveat that a core dump was not available.

How to access glibc heap metadata

February 18, 2021

I had that exact requirement recently. I needed to restore the glibc heap from a core dump based on a new process. After restoring all original mappings, all it took was patching main_arena.

How to compare core dumps for simple time travel debugging

January 6, 2021

How can the difference between two Linux core dumps be identified and why would this even come up? This is going to be lengthy, but will hopefully give you your answer to both of those questions.

How to trace JVM filesystem accesses using Java

December 11, 2020

For tracing filesystem accesses of Java applications, native tracing facilities are always the first choice. On Windows, use Process Monitor to trace I/O. On Linux, use strace. Other platforms provide similar facilities.

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