[Bug tree-optimization/101897] New: ICE Segmentation fault since r12-2429-g62acc72a957b5614

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101897

            Bug ID: 101897
           Summary: ICE Segmentation fault since
                    r12-2429-g62acc72a957b5614
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: rdsandiford at googlemail dot com
  Target Milestone: ---

The following crashes:

$ gfortran
/home/marxin/Programming/gcc/gcc/testsuite/gfortran.fortran-torture/execute/intrinsic_eoshift.f90
-fno-tree-ch -Ofast -fno-tree-vrp --param=unroll-jam-min-percent=0
--param=max-completely-peel-times=0
during GIMPLE pass: unrolljam
/home/marxin/Programming/gcc/gcc/testsuite/gfortran.fortran-torture/execute/intrinsic_eoshift.f90:2:25:

    2 | program intrinsic_eoshift
      |                         ^
internal compiler error: Segmentation fault
0xf58f5a crash_signal
        /home/marxin/Programming/gcc/gcc/toplev.c:328
0x7ffff786239f ???
        ../sysdeps/unix/sysv/linux/sigaction.c:10
0x10c9b1c tree_transform_and_unroll_loop(loop*, unsigned int, edge_def*,
tree_niter_desc*, void (*)(loop*, void*), void*)
        /home/marxin/Programming/gcc/gcc/tree-ssa-loop-manip.c:1425
0x1a1530b tree_loop_unroll_and_jam
        /home/marxin/Programming/gcc/gcc/gimple-loop-jam.c:590
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

...
valgrind reports:
==8284== Invalid write of size 4
==8284==    at 0x13A503E: tree_transform_and_unroll_loop(loop*, unsigned int,
edge_def*, tree_niter_desc*, void (*)(loop*, void*), void*)
(tree-ssa-loop-manip.c:1425)
==8284==    by 0x13A528E: tree_unroll_loop(loop*, unsigned int, edge_def*,
tree_niter_desc*) (tree-ssa-loop-manip.c:1466)
==8284==    by 0x223B05B: tree_loop_unroll_and_jam() (gimple-loop-jam.c:590)
==8284==    by 0x10560F9: execute_one_pass(opt_pass*) (passes.c:2567)
==8284==    by 0x10569F2: execute_pass_list_1(opt_pass*) (passes.c:2656)
==8284==    by 0x1056A04: execute_pass_list_1(opt_pass*) (passes.c:2657)
==8284==    by 0x1056A04: execute_pass_list_1(opt_pass*) (passes.c:2657)
==8284==    by 0x1056A35: execute_pass_list(function*, opt_pass*)
(passes.c:2667)
==8284==    by 0xC79A94: expand (cgraphunit.c:1828)
==8284==    by 0xC79A94: cgraph_node::expand() (cgraphunit.c:1781)
==8284==    by 0xC7B0BE: expand_all_functions (cgraphunit.c:1992)
==8284==    by 0xC7B0BE: compile (cgraphunit.c:2356)
==8284==    by 0xC7B0BE: symbol_table::compile() (cgraphunit.c:2267)
==8284==    by 0xC7DD57: symbol_table::finalize_compilation_unit()
(cgraphunit.c:2537)
==8284==    by 0x118E7DC: compile_file() (toplev.c:483)
==8284==  Address 0x2c is not stack'd, malloc'd or (recently) free'd
==8284== 
during GIMPLE pass: unrolljam