[Bug 1843804] Re: DEP8 segfault on arm64

[Balint Reczey]

The package started failing the same way on ppc64el in Impish:

https://autopkgtest.ubuntu.com/packages/r/ruby-ferret/impish/ppc64el

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https://bugs.launchpad.net/bugs/1843804

Title:
  DEP8 segfault on arm64

Status in glibc package in Ubuntu:
  Invalid
Status in ruby-ferret package in Ubuntu:
  Triaged
Status in ruby2.5 package in Ubuntu:
  Invalid

Bug description:
  DEP8 tests are segfaulting on arm64:
  ...Stack trace:
  Not available
  E
  ===============================================================================
  Error: test_key_used_for_id_field(IndexTest):
    StandardError: Signal occurred at <global.c>:422 in sighandler_crash
    Exiting on signal SIGSEGV (11)
  /tmp/autopkgtest.emjxzb/build.gxX/src/test/unit/index/tc_index.rb:202:in `new'
  /tmp/autopkgtest.emjxzb/build.gxX/src/test/unit/index/tc_index.rb:202:in `test_key_used_for_id_field'
       199:   def test_key_used_for_id_field
       200:     fs_path = File.expand_path(File.join(File.dirname(__FILE__), '../../temp/fsdir'))
       201: 
    => 202:     index = Index.new(:path => fs_path, :key => :my_id, :create => true)
       203:     [
       204:       {:my_id => "three", :id => "me"},
       205:       {:my_id => "one", :field2 => "three"},
  ===============================================================================

  Closest I got to debugging this is:
  #0  0x0000ffffbf5a0744 in generic_ivar_get (undef=52, id=85987, obj=<optimized out>) at variable.c:990
          iv_index_tbl = <error reading variable iv_index_tbl (Cannot access memory at address 0x0)>
          index = 187649990798752
          ivtbl = 0xaaaaab0b2da0
          ivtbl = <optimized out>
          iv_index_tbl = <optimized out>
          index = <optimized out>
          ret = <optimized out>
  #1  rb_ivar_lookup (obj=<optimized out>, id=id at entry=85987, undef=undef at entry=52) at variable.c:1205
          val = <optimized out>
          ptr = <optimized out>
          iv_index_tbl = <optimized out>
          len = <optimized out>
          index = 187649990798752
  #2  0x0000ffffbf5a15e0 in rb_ivar_lookup (undef=52, id=85987, obj=<optimized out>) at variable.c:1184
          val = <optimized out>
          len = <optimized out>
          ptr = <optimized out>
          iv_index_tbl = <optimized out>
          index = <optimized out>
          val = <optimized out>
          ptr = <optimized out>
          iv_index_tbl = <optimized out>
          len = <optimized out>
          index = <optimized out>
  #3  rb_ivar_get (obj=<optimized out>, id=85987) at variable.c:1214
          iv = <optimized out>
  #4  0x0000ffffbeb1c12c in frb_fsdir_new (argc=<optimized out>, argv=<optimized out>, klass=<optimized out>) at r_store.c:375
          ref_cnt = <optimized out>
          self = 187649991624280
          rpath = 187649996041240
          rcreate = <optimized out>
          store = 0xaaaaab391410
          create = <optimized out>
          verify = <optimized out>

  The full stack trace has 85 frames.

  The NULL iv_index_tbl comes from;
          st_table *iv_index_tbl = RCLASS_IV_INDEX_TBL(rb_obj_class(obj));

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