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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/108552] Linux i386 kernel 5.14 memory corruption for
 pre_compound_page() when gcov is enabled
Date: Thu, 26 Jan 2023 19:06:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108552

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|1                           |0
             Status|WAITING                     |UNCONFIRMED

--- Comment #11 from Andrew Pinski <pinskia at gcc dot gnu.org> ---


The generated IR from the trunk:
  <bb 7> [local count: 118111600]:
  PROF_edge_counter_113 =3D __gcov0.set_compound_page_dtor[1];
  PROF_edge_counter_114 =3D PROF_edge_counter_113 + 1;
  __gcov0.set_compound_page_dtor[1] =3D PROF_edge_counter_114;
  MEM[(struct page *)page_12(D) + 40B].D.14083.D.14061.compound_dtor =3D 1;
  PROF_edge_counter_47 =3D __gcov0.prep_compound_page[8];
  PROF_edge_counter_48 =3D PROF_edge_counter_47 + 1;
  __gcov0.prep_compound_page[8] =3D PROF_edge_counter_48;
  PROF_edge_counter_96 =3D __gcov0.set_compound_order[0];
  PROF_edge_counter_97 =3D PROF_edge_counter_96 + 1;
  __gcov0.set_compound_order[0] =3D PROF_edge_counter_97;
  _98 =3D (unsigned char) order_8(D);
  MEM[(struct page *)page_12(D) + 40B].D.14083.D.14061.compound_order =3D _=
98;
  if (order_8(D) > 31)
    goto <bb 10>; [0.00%]
  else
    goto <bb 11>; [100.00%]

  <bb 8> [local count: 105119324]:
  _176 =3D (long unsigned int) page_12(D);
  _95 =3D _176 + 1;
  pretmp_94 =3D __gcov0.prep_compound_page[7];
  _179 =3D pretmp_94 + 1;
  ivtmp.1725_211 =3D (unsigned long long) _179;
  _155 =3D page_12(D) + 40;
  ivtmp.1730_157 =3D (unsigned int) _155;
  _135 =3D (unsigned int) nr_pages_11;
  _134 =3D _135 + 4294967294;
  _132 =3D (unsigned long long) _134;
  _89 =3D (unsigned long long) pretmp_94;
  _76 =3D _89 + 2;
  _19 =3D _76 + _132;

  <bb 9> [local count: 955630225]:
  # ivtmp.1725_77 =3D PHI <ivtmp.1725_69(9), ivtmp.1725_211(8)>
  # ivtmp.1730_178 =3D PHI <ivtmp.1730_168(9), ivtmp.1730_157(8)>
  p_16 =3D (struct page *) ivtmp.1730_178;
  MEM <struct address_space *> [(union  *)p_16 + 12B] =3D 1024B;
  MEM[(volatile long unsigned int *)p_16 + 4B] =3D{v} _95;
  PROF_edge_counter_46 =3D (long long int) ivtmp.1725_77;
  __gcov0.prep_compound_page[7] =3D PROF_edge_counter_46;
  ivtmp.1725_69 =3D ivtmp.1725_77 + 1;
  ivtmp.1730_168 =3D ivtmp.1730_178 + 40;
  if (_19 !=3D ivtmp.1725_69)
    goto <bb 9>; [89.00%]
  else
    goto <bb 7>; [11.00%]=