https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120464
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
You didn't say which host was this (nor which target).
I assume it is some host without working mmap.
Anyway, trying to reproduce it on x86_64-linux with
--- gcc/ggc-page.cc.jj 2025-05-27 23:08:37.969726172 +0200
+++ gcc/ggc-page.cc 2025-05-28 21:16:49.545802332 +0200
@@ -44,6 +44,7 @@ along with GCC; see the file COPYING3.
#ifdef HAVE_MMAP_DEV_ZERO
# define USING_MMAP
#endif
+#undef USING_MMAP
#ifndef USING_MMAP
#define USING_MALLOC_PAGE_GROUPS
@@ -955,7 +956,7 @@ alloc_page (unsigned order)
/* If we allocated multiple pages, put the rest on the free list. */
if (multiple_pages)
{
- struct page_entry *e, *f = G.free_pages;
+ struct page_entry *e, *f = free_list->free_pages;
for (a = enda - G.pagesize; a != page; a -= G.pagesize)
{
e = XCNEWVAR (struct page_entry, page_entry_size);
things progress a little bit further but ICE during selftest:
cc1plus: internal compiler error: Segmentation fault
0x26ed16f internal_error(char const*, ...)
../../gcc/diagnostic-global-context.cc:517
0x13d5f1f crash_signal
../../gcc/toplev.cc:321
0xe25ecf do_release_pages
../../gcc/ggc-page.cc:1204
0xe25ecf release_pages
../../gcc/ggc-page.cc:1242
0xe27632 ggc_collect(ggc_collect)
../../gcc/ggc-page.cc:2316
0x102fdfe test_length
../../gcc/ggc-tests.cc:80
0x102fdfe selftest::ggc_tests_cc_tests()
../../gcc/ggc-tests.cc:468
0x25dcbe5 selftest::run_tests()
../../gcc/selftest-run-tests.cc:71
0x13d761a toplev::run_self_tests()
../../gcc/toplev.cc:2266
The segfault line is
/* Remove all pages from free page groups from the list. */
pp = &free_list->free_pages;
while ((p = *pp) != NULL)
if (p->group->in_use == 0)
{
*pp = p->next;
free (p);
}
else
pp = &p->next;
the if (p->group->in_use == 0) one. And p->group in that case refers to
already freed memory.
