D32090.diff
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D32090.diff
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	diff --git a/sys/compat/linuxkpi/common/src/linux_page.c b/sys/compat/linuxkpi/common/src/linux_page.c
	--- a/sys/compat/linuxkpi/common/src/linux_page.c
	+++ b/sys/compat/linuxkpi/common/src/linux_page.c
	@@ -281,6 +281,7 @@
	unsigned long pfn, pgprot_t prot)
	{
	vm_object_t vm_obj = vma->vm_obj;
	+ vm_object_t tmp_obj;
	vm_page_t page;
	vm_pindex_t pindex;

	@@ -296,6 +297,32 @@
	page = PHYS_TO_VM_PAGE(IDX_TO_OFF(pfn));
	if (!vm_page_busy_acquire(page, VM_ALLOC_WAITFAIL))
	goto retry;
	+ if (page->object != NULL) {
	+ tmp_obj = page->object;
	+ vm_page_xunbusy(page);
	+ VM_OBJECT_WUNLOCK(vm_obj);
	+ VM_OBJECT_WLOCK(tmp_obj);
	+ if (page->object == tmp_obj &&
	+ vm_page_busy_acquire(page, VM_ALLOC_WAITFAIL)) {
	+ KASSERT(page->object == tmp_obj,
	+ ("page has changed identity"));
	+ KASSERT((page->oflags & VPO_UNMANAGED) == 0,
	+ ("page does not belong to shmem"));
	+ vm_pager_page_unswapped(page);
	+ if (pmap_page_is_mapped(page)) {
	+ vm_page_xunbusy(page);
	+ VM_OBJECT_WUNLOCK(tmp_obj);
	+ printf("%s: page rename failed: page "
	+ "is mapped\n", __func__);
	+ VM_OBJECT_WLOCK(vm_obj);
	+ return (VM_FAULT_NOPAGE);
	+ }
	+ vm_page_remove(page);
	+ }
	+ VM_OBJECT_WUNLOCK(tmp_obj);
	+ VM_OBJECT_WLOCK(vm_obj);
	+ goto retry;
	+ }
	if (vm_page_insert(page, vm_obj, pindex)) {
	vm_page_xunbusy(page);
	return (VM_FAULT_OOM);