http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60553
--- Comment #2 from Martin Liška <marxin.liska at gmail dot com> --- Reduced input object files to ~800, bt consists of ~66K frames. gdb: (gdb) bt 10 #0 0x00000000005cec2c in lookup_page_table_entry (p=<error reading variable: Cannot access memory at address 0x7fff63d42ff8>) at ../../gcc/ggc-page.c:584 #1 0x00000000005cfc5e in ggc_set_mark (p=0x7feaf406c020) at ../../gcc/ggc-page.c:1467 #2 0x00000000005a9222 in gt_ggc_mx_lang_tree_node (x_p=0x7feaf406c020) at ./gtype-lto.h:36 #3 0x00000000005aae37 in gt_ggc_mx_lang_tree_node (x_p=0x7feaec684bd0) at ./gtype-lto.h:356 #4 0x00000000005aa461 in gt_ggc_mx_lang_tree_node (x_p=0x7feaec6ad398) at ./gtype-lto.h:243 #5 0x00000000005aaf17 in gt_ggc_mx_lang_tree_node (x_p=0x7feaec68af18) at ./gtype-lto.h:374 #6 0x00000000005aaf34 in gt_ggc_mx_lang_tree_node (x_p=0x7feaec68c2a0) at ./gtype-lto.h:375 #7 0x00000000005aa461 in gt_ggc_mx_lang_tree_node (x_p=0x7feaec695e60) at ./gtype-lto.h:243 #8 0x00000000005aaf17 in gt_ggc_mx_lang_tree_node (x_p=0x7feaec69a0a8) at ./gtype-lto.h:374 #9 0x00000000005aaf34 in gt_ggc_mx_lang_tree_node (x_p=0x7feaec697d20) at ./gtype-lto.h:375 #2 0x00000000005a9222 in gt_ggc_mx_lang_tree_node (x_p=0x7feaf406c020) at ./gtype-lto.h:36 36 while (ggc_test_and_set_mark (xlimit)) (gdb) print (*x).generic.base $20 = {code = INTEGER_CST, side_effects_flag = 0, constant_flag = 1, addressable_flag = 0, volatile_flag = 0, readonly_flag = 0, asm_written_flag = 0, nowarning_flag = 0, visited = 0, used_flag = 0, nothrow_flag = 0, static_flag = 0, public_flag = 0, private_flag = 0, protected_flag = 0, deprecated_flag = 0, default_def_flag = 0, u = {bits = {lang_flag_0 = 0, lang_flag_1 = 0, lang_flag_2 = 0, lang_flag_3 = 0, lang_flag_4 = 0, lang_flag_5 = 0, lang_flag_6 = 0, saturating_flag = 0, unsigned_flag = 0, packed_flag = 0, user_align = 0, nameless_flag = 0, atomic_flag = 0, spare0 = 0, spare1 = 0, address_space = 0}, length = 0, version = 0}} (gdb) up #3 0x00000000005aae37 in gt_ggc_mx_lang_tree_node (x_p=0x7feaec684bd0) at ./gtype-lto.h:356 356 gt_ggc_m_9tree_node ((*x).generic.type_non_common.with_lang_specific.common.size); (gdb) print (*x).generic.base $21 = {code = INTEGER_TYPE, side_effects_flag = 0, constant_flag = 0, addressable_flag = 0, volatile_flag = 0, readonly_flag = 0, asm_written_flag = 0, nowarning_flag = 0, visited = 0, used_flag = 0, nothrow_flag = 0, static_flag = 0, public_flag = 0, private_flag = 0, protected_flag = 0, deprecated_flag = 0, default_def_flag = 0, u = {bits = {lang_flag_0 = 0, lang_flag_1 = 0, lang_flag_2 = 0, lang_flag_3 = 0, lang_flag_4 = 0, lang_flag_5 = 0, lang_flag_6 = 0, saturating_flag = 0, unsigned_flag = 1, packed_flag = 0, user_align = 0, nameless_flag = 0, atomic_flag = 0, spare0 = 0, spare1 = 0, address_space = 0}, length = 256, version = 256}} (gdb) up #4 0x00000000005aa461 in gt_ggc_mx_lang_tree_node (x_p=0x7feaec6ad398) at ./gtype-lto.h:243 243 gt_ggc_m_9tree_node ((*x).generic.type_decl.common.common.common.common.common.common.typed.type); (gdb) print (*x).generic.base $22 = {code = TYPE_DECL, side_effects_flag = 0, constant_flag = 0, addressable_flag = 0, volatile_flag = 0, readonly_flag = 0, asm_written_flag = 0, nowarning_flag = 0, visited = 0, used_flag = 0, nothrow_flag = 0, static_flag = 0, public_flag = 0, private_flag = 0, protected_flag = 0, deprecated_flag = 0, default_def_flag = 0, u = {bits = {lang_flag_0 = 0, lang_flag_1 = 0, lang_flag_2 = 0, lang_flag_3 = 0, lang_flag_4 = 0, lang_flag_5 = 0, lang_flag_6 = 0, saturating_flag = 0, unsigned_flag = 1, packed_flag = 0, user_align = 0, nameless_flag = 0, atomic_flag = 0, spare0 = 0, spare1 = 0, address_space = 0}, length = 256, version = 256}} (gdb) up #5 0x00000000005aaf17 in gt_ggc_mx_lang_tree_node (x_p=0x7feaec68af18) at ./gtype-lto.h:374 374 gt_ggc_m_9tree_node ((*x).generic.type_non_common.with_lang_specific.common.name); (gdb) print (*x).generic.base $23 = {code = RECORD_TYPE, side_effects_flag = 0, constant_flag = 0, addressable_flag = 1, volatile_flag = 0, readonly_flag = 0, asm_written_flag = 0, nowarning_flag = 0, visited = 0, used_flag = 0, nothrow_flag = 0, static_flag = 0, public_flag = 0, private_flag = 0, protected_flag = 0, deprecated_flag = 0, default_def_flag = 0, u = {bits = {lang_flag_0 = 0, lang_flag_1 = 0, lang_flag_2 = 0, lang_flag_3 = 0, lang_flag_4 = 0, lang_flag_5 = 0, lang_flag_6 = 0, saturating_flag = 0, unsigned_flag = 0, packed_flag = 0, user_align = 0, nameless_flag = 0, atomic_flag = 0, spare0 = 0, spare1 = 0, address_space = 0}, length = 0, version = 0}} (gdb) up #6 0x00000000005aaf34 in gt_ggc_mx_lang_tree_node (x_p=0x7feaec68c2a0) at ./gtype-lto.h:375 375 gt_ggc_m_9tree_node ((*x).generic.type_non_common.with_lang_specific.common.next_variant); (gdb) print (*x).generic.base $24 = {code = RECORD_TYPE, side_effects_flag = 0, constant_flag = 0, addressable_flag = 1, volatile_flag = 0, readonly_flag = 0, asm_written_flag = 0, nowarning_flag = 0, visited = 0, used_flag = 0, nothrow_flag = 0, static_flag = 0, public_flag = 0, private_flag = 0, protected_flag = 0, deprecated_flag = 0, default_def_flag = 0, u = {bits = {lang_flag_0 = 0, lang_flag_1 = 0, lang_flag_2 = 0, lang_flag_3 = 0, lang_flag_4 = 0, lang_flag_5 = 0, lang_flag_6 = 0, saturating_flag = 0, unsigned_flag = 0, packed_flag = 0, user_align = 0, nameless_flag = 0, atomic_flag = 0, spare0 = 0, spare1 = 0, address_space = 0}, length = 0, version = 0}} (gdb) up #7 0x00000000005aa461 in gt_ggc_mx_lang_tree_node (x_p=0x7feaec695e60) at ./gtype-lto.h:243 243 gt_ggc_m_9tree_node ((*x).generic.type_decl.common.common.common.common.common.common.typed.type); (gdb) print (*x).generic.base $25 = {code = TYPE_DECL, side_effects_flag = 0, constant_flag = 0, addressable_flag = 0, volatile_flag = 0, readonly_flag = 0, asm_written_flag = 0, nowarning_flag = 0, visited = 0, used_flag = 0, nothrow_flag = 0, static_flag = 0, public_flag = 0, private_flag = 1, protected_flag = 0, deprecated_flag = 0, default_def_flag = 0, u = {bits = {lang_flag_0 = 0, lang_flag_1 = 0, lang_flag_2 = 0, lang_flag_3 = 0, lang_flag_4 = 0, lang_flag_5 = 0, lang_flag_6 = 0, saturating_flag = 0, unsigned_flag = 0, packed_flag = 0, user_align = 0, nameless_flag = 0, atomic_flag = 0, spare0 = 0, spare1 = 0, address_space = 0}, length = 0, version = 0}}