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guix/gnu/packages/patches/guile-continuation-stack-le...

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This patch fixes a memory leak when capturing and resuming delimited
continuations intensively, as is the case with the Shepherd 0.9+:
https://issues.guix.gnu.org/59021
diff --git a/libguile/vm.c b/libguile/vm.c
index 6fd5c554f..516bae773 100644
--- a/libguile/vm.c
+++ b/libguile/vm.c
@@ -165,11 +165,13 @@ capture_stack (union scm_vm_stack_element *stack_top,
scm_t_dynstack *dynstack, uint32_t flags)
{
struct scm_vm_cont *p;
+ size_t stack_size;
- p = scm_gc_malloc (sizeof (*p), "capture_vm_cont");
- p->stack_size = stack_top - sp;
- p->stack_bottom = scm_gc_malloc (p->stack_size * sizeof (*p->stack_bottom),
- "capture_vm_cont");
+ stack_size = stack_top - sp;
+ p = scm_gc_malloc (sizeof (*p) + stack_size * sizeof (*p->stack_bottom),
+ "capture_vm_cont");
+ p->stack_size = stack_size;
+ p->stack_bottom = (void *) ((char *) p + sizeof (*p));
p->vra = vra;
p->mra = mra;
p->fp_offset = stack_top - fp;