Re: Diagnosing heap corruption

  • From: Mike Pall <mike-1206@xxxxxxxxxx>
  • To: luajit@xxxxxxxxxxxxx
  • Date: Fri, 1 Jun 2012 17:27:00 +0200

Finn Wilcox wrote:
> What is a good way to check the whole heap for corruption?
> I am seeing intermittent segfaults, and I suspect a C function
> and/or a Lua function is overrunning a buffer (allocated with
> valgrind does not report anything, but maybe that is because
> LuaJIT's own allocator is allocating larger blocks (that are not
> corrupted) and returning smaller chunks of these from

Umm, have you read the part about Valgrind in src/Makefile? The
memcheck tool only works reasonably well, when you use the system
provided memory allocator (*) and turn on debug symbols.

(*) Which you cannot do on x64. If that's your setup, try
compiling in 32 bit mode to debug it.

It's also often easier to track these corruptions in interpreter
mode (luajit -joff). If that happens to make the problem go away,
please read:


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