Commits on Jun 20, 2023

1. Fix jl_gc_internal_obj_base_ptr …

   The function `jl_gc_internal_obj_base_ptr` takes a pointer and tries to
   determine if it is a valid object pointer. As such it has to carefully
   validate all data it reads, and abort whenever there are obvious
   inconsistencies.
   
   This patch adds a check which aborts when `meta->osize` is zero, just
   before we perform a division-with-remainder by this value, thus avoiding
   a potential division-by-zero exception. This fixes a crash we are seeing
   in our code.
   
   The crash did not happen before PR JuliaLang#49644 was merged because back then
   there was a check for `meta->ages` not being zero, which apparently was
   enough to detect invalid values for `meta` (e.g. when `meta` points into
   a null page).

   

   fingolfin committed Jun 20, 2023
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