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Have memguard(9) crash with an easier-to-debug message on double-free.

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Reviewed by:    zml
MFC after:      3 weeks
This commit is contained in:
Matthew D Fleming 2010-08-31 17:43:47 +00:00
parent 52e2247273
commit a2a200a24d
1 changed files with 5 additions and 1 deletions
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6
sys/vm/memguard.c
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@ -247,9 +247,13 @@ SYSINIT(memguard, SI_SUB_KLD, SI_ORDER_ANY, memguard_sysinit, NULL);
static u_long *
v2sizep(vm_offset_t va)
{
vm_paddr_t pa;
struct vm_page *p;
p = PHYS_TO_VM_PAGE(pmap_kextract(va));
pa = pmap_kextract(va);
if (pa == 0)
panic("MemGuard detected double-free of %p", (void *)va);
p = PHYS_TO_VM_PAGE(pa);
KASSERT(p->wire_count != 0 && p->queue == PQ_NONE,
("MEMGUARD: Expected wired page %p in vtomgfifo!", p));
return ((u_long *)&p->pageq.tqe_next);