Why does java app crash in gdb but runs normally in real life?

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Why does java app crash in gdb but runs normally in real life?

Because it doesn’t actually crash.

Java uses speculative loads. If a pointer points to addressable memory, the load succeeds. Rarely the pointer does not point to addressable memory, and the attempted load generates SIGSEGV … which java runtime intercepts, makes the memory addressable again, and restarts the load instruction.

When debugging java programs, one has to generally do this:

(gdb) handle SIGSEGV nostop noprint pass

Unfortunately, if there is some JNI code involved, and that code SIGSEGVs, GDB will happily ignore that signal as well, resulting in the death of inferior (being debugged) process. I have not found an acceptable solution for that latter problem.

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