% gdb .libs/gctest
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This GDB was configured as "i386-marcel-freebsd"...
(gdb) run
Starting program: /usr/home/amdmi3/projects/freebsd/ports/devel/boehm-gc/work/gc-7.1/.libs/gctest 
Switched to incremental mode
Emulating dirty bits with mprotect/signals

Program received signal SIGSEGV, Segmentation fault.
0x280ad250 in GC_clear_fl_links (flp=0x8095fb0) at reclaim.c:471
471	       *flp = 0;
(gdb) bt full
#0  0x280ad250 in GC_clear_fl_links (flp=0x8095fb0) at reclaim.c:471
	next = (void *) 0x8095fa0
#1  0x280ad34f in GC_start_reclaim (report_if_found=0) at reclaim.c:506
	fop = (void **) 0x804cf94
	rlim = (struct hblk **) 0x80a8034
	lim = (void **) 0x804d390
	rlp = (struct hblk **) 0x80a8034
	rlist = (struct hblk **) 0x80a5078
	should_clobber = 1
	kind = 1
#2  0x280a0195 in GC_finish_collection () at alloc.c:700
	start_time = 0
	finalize_time = 0
	done_time = 1
#3  0x2809f89d in GC_maybe_gc () at alloc.c:304
	n_partial_gcs = 1
#4  0x2809fbac in GC_collect_a_little_inner (n=1) at alloc.c:433
	i = 0
#5  0x280a0b68 in GC_allocobj (gran=1, kind=1) at alloc.c:1050
	flh = (void **) 0x804cf90
	tried_minor = 0
#6  0x280a54e5 in GC_generic_malloc_inner (lb=0, k=1) at malloc.c:119
	kind = (struct obj_kind *) 0x280b2274
	lg = 1
	opp = (void **) 0x804cf90
	op = (void *) 0x0
#7  0x280a564e in GC_generic_malloc (lb=0, k=1) at malloc.c:159
	result = (void *) 0x80be004
#8  0x280a595b in GC_malloc (lb=0) at malloc.c:272
	op = (void *) 0x0
	opp = (void **) 0x804cf90
	lg = 1
#9  0x0804a85b in run_one_test () at tests/test.c:1147
	i = 5117
	x = 0x8097fd8 ""
	z = (char **) 0x8095fe0
	y = 0x804a41a "U\211å¡(>\a\b\203À\001£(>\a\b]ÃU\211å\201ì¨\001"
	start_time = 16
	reverse_time = 1
	typed_time = 3217025272
	tree_time = 3217025192
	time_diff = 671405673
#10 0x0804aef8 in main () at tests/test.c:1385
No locals.