Segfaults on gdb testsuite

[vries]

After running the gdb testsuite, we have a directory with test-case executables. We can use those to test pahole as well:
...
$ for f in $(find build/gdb/testsuite -type f -executable); do ~/dwarves/build/pahole $f > /dev/null 2>&1; st=$?; if [ $st -ne 0 ]; then echo "$f $st"; fi; done
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.fortran/derived-type/derived-type 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.fortran/max-depth/max-depth 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/O2_float_param/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/access_tagged_param/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/access_to_packed_array/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/access_to_unbounded_array/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/addr_arith/foo_na07_019 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/aliased_array/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/arr_acc_idx_w_gap/enum_with_gap_main 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/arr_arr/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/arr_enum_idx_w_gap/foo_q418_043 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/array_bounds/bar 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/array_char_idx/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/array_of_variable_length/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/array_ptr_renaming/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/array_return/p 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/array_subscript_addr/p 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/arraydim/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/arrayidx/p 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/arrayparam/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/arrayptr/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/assign_arr/main_p324_051 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/atomic_enum/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/attr_ref_and_charlit/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/bad-task-bp-keyword/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/bias/bias 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/big_packed_array/foo_ra24_010 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/bp_c_mixed_case/foo_h731_021 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/bp_enum_homonym/p 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/bp_fun_addr/bp_fun_addr 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/bp_inlined_func/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/bp_on_var/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/bp_range_type/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/bp_reset/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/byte_packed_arr/reprod_main 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/call_pn/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/catch_assert_if/bla 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/catch_ex/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/catch_ex_std/libsome_package.so 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/catch_ex_std/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/char_enum/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/char_param/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/complete/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/cond_lang/a 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/convvar_comp/pb16_063 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/dgopt/x 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/disc_arr_bound/foo_n612_026 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/display_nested/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/dot_all/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/dyn_arrayidx/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/dyn_loc/p 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/dyn_stride/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/enum_idx_packed/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/excep_handle/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/exec_changed/first 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/exec_changed/common 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/expr_delims/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/expr_with_funcall/expr_r821_013 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/exprs/p 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/fin_fun_out/foo_o525_013 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/fixed_cmp/fixed 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/fixed_points/fixed_points 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/float_param/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/formatted_ref/formatted_ref 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/frame_arg_lang/bla 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/frame_args/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/fullname_bp/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/fun_addr/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/fun_in_declare/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/fun_overload_menu/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/fun_renaming/fun_renaming 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/funcall_char/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/funcall_param/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/funcall_ptr/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/funcall_ref/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/homonym/homonym_main 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/info_addr_mixed_case/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/info_auto_lang/proc_in_ada 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/info_exc/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/info_locals_renaming/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/int_deref/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/interface/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/iwide/p 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/lang_switch/lang_switch 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/length_cond/length_cond 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/maint_with_ada/var_arr_typedef 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/mi_catch_assert/bla 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/mi_catch_ex/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/mi_catch_ex_hand/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/mi_dyn_arr/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/mi_ex_cond/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/mi_exc_info/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/mi_interface/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/mi_prot/prot 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/mi_ref_changeable/foo_rb20_056 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/mi_string_access/bar 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/mi_task_arg/task_switch 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/mi_task_info/task_switch 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/mi_var_array/bar 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/mi_var_union/bar 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/mi_variant/pkg 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/minsyms/foo_qb07_057 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/mod_from_name/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/n_arr_bound/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/nested/hello 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/notcplusplus/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/null_array/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/null_record/null_record 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/operator_bp/ops_test 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/optim_drec/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/out_of_line_in_inlined/foo_o224_021 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/packed_array/pa 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/packed_array_assign/tester 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/packed_tagged/comp_bug 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/pckd_arr_ren/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/pckd_neg/foo_o508_021 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/pkd_arr_elem/failure 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/pp-rec-component/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/print_chars/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/print_pc/dummy 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/ptr_typedef/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/ptype_array/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/ptype_field/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/ptype_tagged_param/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/ptype_tagged_param/gnat_debug_info_test 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/py_range/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/py_taft/main 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/rdv_wait/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/rec_comp/bar_o203_012 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/rec_return/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/ref_param/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/ref_tick_size/p 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/rename_subscript_param/pb30_012 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/repeat_dyn/foo_oc22_002 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/same_component_name/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/same_enum/a 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/scalar_storage/storage 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/scoped_watch/foo_p708_025 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/set_pckd_arr_elt/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/set_wstr/a 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/small_reg_param/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/start/dummy 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/str_binop_equal/foo_p211_061 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/str_ref_cmp/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/str_uninit/parse 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/sub_variant/subv 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/sym_print_name/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/taft_type/p 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/tagged/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/tagged_access/p 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/tagged_not_init/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/task_bp/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/task_switch_in_core/crash 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/tasks/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/tick_last_segv/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/tick_length_array_enum_idx/foo_n207_004 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/type_coercion/assign 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/unc_arr_ptr_in_var_rec/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/unchecked_union/unchecked_union 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/uninitialized_vars/parse 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/var_arr_attrs/foo_o115_002 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/var_arr_typedef/var_arr_typedef 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/var_rec_arr/foo_na09_042 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/variant-record/proc 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/variant/pkg 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/variant_record_packed_array/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/varsize_limit/vsizelim 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/vla/vla 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/watch_arg/watch 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/watch_minus_l/foo_ra10_006 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/whatis_array_val/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/widewide/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.ada/win_fu_syms/foo 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.base/gdb-caching-proc/gnat_debug_info_test 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.dwarf2/dw2-error/dw2-error 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.dwarf2/variant/variant 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.rust/methods/methods 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.rust/modules/modules 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.rust/rust-style/rust-style 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.rust/simple/simple 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.rust/traits/traits 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.rust/union/union 139
Segmentation fault (core dumped)
build/gdb/testsuite/outputs/gdb.rust/unsized/unsized 139
...

[vries]

First (build/gdb/testsuite/outputs/gdb.fortran/derived-type/derived-type) in more detail:
...
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7f65ce2 in tag__is_struct (tag=0x0) at /home/vries/dwarves/src/dwarves.h:419
419 return tag->tag == DW_TAG_structure_type ||
...

with backtrace:
...
(gdb) bt
#0 0x00007ffff7f65ce2 in tag__is_struct (tag=0x0) at /home/vries/dwarves/src/dwarves.h:419
#1 0x00007ffff7f69baa in type__check_structs_at_unnatural_alignments (type=0x4399d0, cu=0x432ad0)
at /home/vries/dwarves/src/dwarves.c:1491
#2 0x00007ffff7f69cd4 in class__infer_packed_attributes (cls=0x4399d0, cu=0x432ad0) at /home/vries/dwarves/src/dwarves.c:1521
#3 0x00007ffff7f70521 in __class__fprintf (class=0x4399d0, cu=0x432ad0, conf=0x7fffffffb590, fp=0x7ffff7e5e500 <IO_2_1_stdout>)
at /home/vries/dwarves/src/dwarves_fprintf.c:1351
#4 0x00007ffff7f720f0 in tag__fprintf (tag=0x4399d0, cu=0x432ad0, conf=0x40e2a0 , fp=0x7ffff7e5e500 <IO_2_1_stdout>)
at /home/vries/dwarves/src/dwarves_fprintf.c:1852
#5 0x0000000000402f8c in class_formatter (class=0x4399d0, cu=0x432ad0, id=5) at /home/vries/dwarves/src/pahole.c:229
#6 0x0000000000403302 in print_classes (cu=0x432ad0) at /home/vries/dwarves/src/pahole.c:324
#7 0x00000000004077af in pahole_stealer (cu=0x432ad0, conf_load=0x40e300 <conf_load>) at /home/vries/dwarves/src/pahole.c:2378
#8 0x00007ffff7f811f1 in finalize_cu (cus=0x436870, cu=0x432ad0, dcu=0x7fffffffb860, conf=0x40e300 <conf_load>)
at /home/vries/dwarves/src/dwarf_loader.c:2216
#9 0x00007ffff7f8122a in finalize_cu_immediately (cus=0x436870, cu=0x432ad0, dcu=0x7fffffffb860, conf=0x40e300 <conf_load>)
at /home/vries/dwarves/src/dwarf_loader.c:2225
#10 0x00007ffff7f818d3 in cus__load_module (cus=0x436870, conf=0x40e300 <conf_load>, mod=0x436570, dw=0x432c50, elf=0x436890,
filename=0x7fffffffe191 "build/gdb/testsuite/outputs/gdb.fortran/derived-type/derived-type")
at /home/vries/dwarves/src/dwarf_loader.c:2378
#11 0x00007ffff7f819e7 in cus__process_dwflmod (dwflmod=0x436570, userdata=0x436580,
name=0x432fa0 "build/gdb/testsuite/outputs/gdb.fortran/derived-type/derived-type", base=4194304, arg=0x7fffffffda80)
at /home/vries/dwarves/src/dwarf_loader.c:2423
#12 0x00007ffff7ee96c1 in dwfl_getmodules () from /usr/lib64/libdw.so.1
#13 0x00007ffff7f81aa7 in cus__process_file (cus=0x436870, conf=0x40e300 <conf_load>, fd=3,
filename=0x7fffffffe191 "build/gdb/testsuite/outputs/gdb.fortran/derived-type/derived-type")
at /home/vries/dwarves/src/dwarf_loader.c:2476
#14 0x00007ffff7f81b23 in dwarf__load_file (cus=0x436870, conf=0x40e300 <conf_load>,
filename=0x7fffffffe191 "build/gdb/testsuite/outputs/gdb.fortran/derived-type/derived-type")
--Type for more, q to quit, c to continue without paging--
at /home/vries/dwarves/src/dwarf_loader.c:2493
#15 0x00007ffff7f6ac7e in cus__load_file (cus=0x436870, conf=0x40e300 <conf_load>,
filename=0x7fffffffe191 "build/gdb/testsuite/outputs/gdb.fortran/derived-type/derived-type")
at /home/vries/dwarves/src/dwarves.c:1941
#16 0x00007ffff7f6b7af in cus__load_files (cus=0x436870, conf=0x40e300 <conf_load>, filenames=0x7fffffffdcf0)
at /home/vries/dwarves/src/dwarves.c:2299
#17 0x00000000004082c8 in main (argc=2, argv=0x7fffffffdce8) at /home/vries/dwarves/src/pahole.c:2675
...

[vries]

Reproducer:
derived-type.debug.gz

[vries]

Reproducer:
derived-type.debug.gz

To be more explicit:

$ ~/dwarves/build/pahole derived-type.debug 
die__process_unit: DW_TAG_string_type (0x12) @ <0x122> not handled!
namespace__recode_dwarf_types: couldn't find 0x122 type for 0x116 (member)!
struct bar {
        integer(kind=4)            c;                    /*     0     4 */
        real(kind=4)               d;                    /*     4     4 */

        /* size: 8, cachelines: 1, members: 2 */
        /* last cacheline: 8 bytes */
};
Segmentation fault (core dumped)

[acmel]

This is a mix of FORTRAN 95, ANSI C99 and MIPS assembler, so something not really tested before, I'll see if we can fix it to the point of not segfaulting, perhaps a warning should be produced as a comment at the start of the output stating that this isn't a language really supported.

[acmel]

Em Thu, Sep 03, 2020 at 02:30:58AM -0700, Tom de Vries escreveu:

> Reproducer: > derived-type.debug.gz To be more explicit: ``` $ ~/dwarves/build/pahole derived-type.debug die__process_unit: DW_TAG_string_type (0x12) @ <0x122> not handled! namespace__recode_dwarf_types: couldn't find 0x122 type for 0x116 (member)! struct bar { integer(kind=4) c; /* 0 4 */ real(kind=4) d; /* 4 4 */ /* size: 8, cachelines: 1, members: 2 */ /* last cacheline: 8 bytes */ }; Segmentation fault (core dumped) ```

So this now looks like below, please let me know if you is ok with my adding your e-mail to the Reported-by tag. First I avoided the NULL deref, which makes this more robust in case we stumble on other new unsupported TAG like DW_TAG_string_type. Now to implement FORTRAN 95 DW_TAG_string_type, its just like DW_TAG_array_type, mostly, i.e. if there's no number of entries, its 1, arrays can be zero sized. And no, I don't plan to provide a FORTRAN source code rebuilder, one can get interesting info looking at it as a C struct 8-)

…

--- dwarves: Check if a member type wasn't found and avoid a NULL deref This dodges a SEGFAULT at type__check_structs_at_unnatural_alignments() so that we can finish processing, give the warnings and produce as much as we can: $ pahole examples/fortran95/derived-type.debug die__process_unit: DW_TAG_string_type (0x12) @ <0x122> not handled! namespace__recode_dwarf_types: couldn't find 0x122 type for 0x116 (member)! struct bar { integer(kind=4) c; /* 0 4 */ real(kind=4) d; /* 4 4 */ /* size: 8, cachelines: 1, members: 2 */ /* last cacheline: 8 bytes */ }; struct foo { real(kind=4) a; /* 0 4 */ struct bar x; /* 4 8 */ <ERROR(__class__fprintf:1519): 0 not found!> /* size: 20, cachelines: 1, members: 3 */ /* padding: 8 */ /* last cacheline: 20 bytes */ }; $ Reported-by: Tom de Vries Bugtracker: #10 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

-- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: #9 (comment)

-- - Arnaldo

[acmel]

Em Thu, Sep 03, 2020 at 02:30:58AM -0700, Tom de Vries escreveu:

> Reproducer: > derived-type.debug.gz To be more explicit: ``` $ ~/dwarves/build/pahole derived-type.debug die__process_unit: DW_TAG_string_type (0x12) @ <0x122> not handled! namespace__recode_dwarf_types: couldn't find 0x122 type for 0x116 (member)! struct bar { integer(kind=4) c; /* 0 4 */ real(kind=4) d; /* 4 4 */ /* size: 8, cachelines: 1, members: 2 */ /* last cacheline: 8 bytes */ }; Segmentation fault (core dumped) ```

And now it all wraps up with: commit f584777 (HEAD) Author: Arnaldo Carvalho de Melo <acme@redhat.com> Date: Fri Sep 18 18:19:22 2020 -0300 fprintf: Support DW_TAG_string_type We don't really reconstruct source code for FORTRAN, we just print it as if it was C: $ pahole examples/fortran95/derived-type.debug struct bar { integer(kind=4) c; /* 0 4 */ real(kind=4) d; /* 4 4 */ /* size: 8, cachelines: 1, members: 2 */ /* last cacheline: 8 bytes */ }; struct foo { real(kind=4) a; /* 0 4 */ struct bar x; /* 4 8 */ string b[7]; /* 12 7 */ /* size: 20, cachelines: 1, members: 3 */ /* padding: 1 */ /* last cacheline: 20 bytes */ }; $ This comes from GCC build tests: $ readelf -wi examples/fortran95/derived-type.debug | grep Fortran -A2 <9c> DW_AT_producer : (indirect string, offset: 0x1fb): GNU Fortran2008 10.2.1 20200728 [revision c0438ced53bcf57e4ebb1c38c226e41571aca892] -mtune=generic -march=x86-64 -g -fno-stack-protector -J /home/vries/gdb_versions/devel/build/gdb/testsuite/outputs/gdb.fortran/derived-type -fintrinsic-modules-path /usr/lib64/gcc/x86_64-suse-linux/10/finclude -fpre-include=/usr/include/finclude/math-vector-fortran.h <a0> DW_AT_language : 14 (Fortran 95) <a1> DW_AT_identifier_case: 2 (down_case) <a2> DW_AT_name : (indirect string, offset: 0x365): /home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.fortran/derived-type.f90 [acme@five pahole]$ readelf -wi examples/fortran95/derived-type.debug | grep DW_TAG_string_type -A2 <1><122>: Abbrev Number: 6 (DW_TAG_string_type) <123> DW_AT_byte_size : 7 $ Now lets see whats more that is there segfaulting pahole, but for now I think I don't have any segfaults, so just wait a bit for Hao to submit the patch to selectively encode the per-cpu variables in BTF and then cut v1.18. Reported-by: Tom de Vries Bugtracker: #9 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

[vries]

So this now looks like below, please let me know if you is ok with my adding your e-mail to the Reported-by tag.

Hi,

sure, this is ok.

[acmel]

Em Sat, Sep 19, 2020 at 10:05:30AM -0700, Tom de Vries escreveu:

> So this now looks like below, please let me know if you is ok with my adding your e-mail to the Reported-by tag. Hi, sure, this is ok.

Also I don't recall if you made the other object files causing segfaults available somewhere, have you? - Arnaldo

…

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-- - Arnaldo

[vries]

Also I don't recall if you made the other object files causing segfaults available somewhere, have you?

I didn't. I'll retest with the latest fixes, and report back.

[vries]

simple.debug.gz

Simple.debug, a rust executable:

$ ~/dwarves/build/pahole simple.debug 
die__process_function: tag not supported 0x2f (template_type_parameter)!
die__process_class: DW_TAG_variant_part (0x33) @ <0x220> not handled!
Segmentation fault (core dumped)

[vries]

foo.debug.gz

Foo.debug, an ada exec:

$ ~/dwarves/build/pahole foo.debug 
die__process_unit: DW_TAG_subrange_type (0x21) @ <0x10b> not handled!
die__process_unit: DW_TAG_subrange_type (0x21) @ <0x134> not handled!
die__process_unit: DW_TAG_subrange_type (0x21) @ <0x148> not handled!
die__process_class: DW_TAG_subrange_type (0x21) @ <0x201> not handled!
Segmentation fault (core dumped)

[vries]

dw2-error.debug.gz

Dwarf assembly test-case:

$ ~/dwarves/build/pahole dw2-error.debug 
Segmentation fault (core dumped)