Have memguard(9) crash with an easier-to-debug message on double-free.
Reviewed by: zml MFC after: 3 weeks
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=212063
@ -247,9 +247,13 @@ SYSINIT(memguard, SI_SUB_KLD, SI_ORDER_ANY, memguard_sysinit, NULL);
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static u_long *
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v2sizep(vm_offset_t va)
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{
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vm_paddr_t pa;
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struct vm_page *p;
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p = PHYS_TO_VM_PAGE(pmap_kextract(va));
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pa = pmap_kextract(va);
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if (pa == 0)
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panic("MemGuard detected double-free of %p", (void *)va);
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p = PHYS_TO_VM_PAGE(pa);
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KASSERT(p->wire_count != 0 && p->queue == PQ_NONE,
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("MEMGUARD: Expected wired page %p in vtomgfifo!", p));
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return ((u_long *)&p->pageq.tqe_next);
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