How to use gdb to debug C1 compiler's internal error?

[Andrew Haley]

On 03/22/2018 04:32 PM, Leslie Zhai wrote:
> So backtrace or set breakpoint might be helpful for debugging compiling 
> thread, but doesn't work for running thread? I am reading Analyzing and 
> Debugging the HotSpot VM at the OS Level[1] please give me some advice, 
> thanks a lot!
> 
> [1] http://www.progdoc.de/papers/JavaOne2014/javaone2014_con3138.html

You'll first need to set a breakpoint in the segfault handler here in
JVM_handle_linux_signal:

  VMError::report_and_die(t, sig, pc, info, ucVoid);

Then you can use gdb to go up the stack to the point of the crash.

At that point you'll be inspecting the stack to see what's there.  If
you can't tell, then your next plan should be to instrument the code
you're generating to add tracing information so that when it does, you
know where you are.

-- 
Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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