[PATCH] mm/hugetlb: avoid get wrong ptep caused by race

["Longpeng(Mike)" <longpeng2@huawei.com>]

Our machine encountered a panic after run for a long time and
the calltrace is:
RIP: 0010:[<ffffffff9dff0587>]  [<ffffffff9dff0587>] hugetlb_fault+0x307/0xbe0
RSP: 0018:ffff9567fc27f808  EFLAGS: 00010286
RAX: e800c03ff1258d48 RBX: ffffd3bb003b69c0 RCX: e800c03ff1258d48
RDX: 17ff3fc00eda72b7 RSI: 00003ffffffff000 RDI: e800c03ff1258d48
RBP: ffff9567fc27f8c8 R08: e800c03ff1258d48 R09: 0000000000000080
R10: ffffaba0704c22a8 R11: 0000000000000001 R12: ffff95c87b4b60d8
R13: 00005fff00000000 R14: 0000000000000000 R15: ffff9567face8074
FS:  00007fe2d9ffb700(0000) GS:ffff956900e40000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffd3bb003b69c0 CR3: 000000be67374000 CR4: 00000000003627e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 [<ffffffff9df9b71b>] ? unlock_page+0x2b/0x30
 [<ffffffff9dff04a2>] ? hugetlb_fault+0x222/0xbe0
 [<ffffffff9dff1405>] follow_hugetlb_page+0x175/0x540
 [<ffffffff9e15b825>] ? cpumask_next_and+0x35/0x50
 [<ffffffff9dfc7230>] __get_user_pages+0x2a0/0x7e0
 [<ffffffff9dfc648d>] __get_user_pages_unlocked+0x15d/0x210
 [<ffffffffc068cfc5>] __gfn_to_pfn_memslot+0x3c5/0x460 [kvm]
 [<ffffffffc06b28be>] try_async_pf+0x6e/0x2a0 [kvm]
 [<ffffffffc06b4b41>] tdp_page_fault+0x151/0x2d0 [kvm]
 [<ffffffffc075731c>] ? vmx_vcpu_run+0x2ec/0xc80 [kvm_intel]
 [<ffffffffc0757328>] ? vmx_vcpu_run+0x2f8/0xc80 [kvm_intel]
 [<ffffffffc06abc11>] kvm_mmu_page_fault+0x31/0x140 [kvm]
 [<ffffffffc074d1ae>] handle_ept_violation+0x9e/0x170 [kvm_intel]
 [<ffffffffc075579c>] vmx_handle_exit+0x2bc/0xc70 [kvm_intel]
 [<ffffffffc074f1a0>] ? __vmx_complete_interrupts.part.73+0x80/0xd0 [kvm_intel]
 [<ffffffffc07574c0>] ? vmx_vcpu_run+0x490/0xc80 [kvm_intel]
 [<ffffffffc069f3be>] vcpu_enter_guest+0x7be/0x13a0 [kvm]
 [<ffffffffc06cf53e>] ? kvm_check_async_pf_completion+0x8e/0xb0 [kvm]
 [<ffffffffc06a6f90>] kvm_arch_vcpu_ioctl_run+0x330/0x490 [kvm]
 [<ffffffffc068d919>] kvm_vcpu_ioctl+0x309/0x6d0 [kvm]
 [<ffffffff9deaa8c2>] ? dequeue_signal+0x32/0x180
 [<ffffffff9deae34d>] ? do_sigtimedwait+0xcd/0x230
 [<ffffffff9e03aed0>] do_vfs_ioctl+0x3f0/0x540
 [<ffffffff9e03b0c1>] SyS_ioctl+0xa1/0xc0
 [<ffffffff9e53879b>] system_call_fastpath+0x22/0x27

( The kernel we used is older, but we think the latest kernel also has this
  bug after dig into this problem. )

For 1G hugepages, huge_pte_offset() wants to return NULL or pudp, but it
may return a wrong 'pmdp' if there is a race. Please look at the following
code snippet:
    ...
    pud = pud_offset(p4d, addr);
    if (sz != PUD_SIZE && pud_none(*pud))
        return NULL;
    /* hugepage or swap? */
    if (pud_huge(*pud) || !pud_present(*pud))
        return (pte_t *)pud;

    pmd = pmd_offset(pud, addr);
    if (sz != PMD_SIZE && pmd_none(*pmd))
        return NULL;
    /* hugepage or swap? */
    if (pmd_huge(*pmd) || !pmd_present(*pmd))
        return (pte_t *)pmd;
    ...

The following sequence would trigger this bug:
1. CPU0: sz = PUD_SIZE and *pud = 0 , continue
1. CPU0: "pud_huge(*pud)" is false
2. CPU1: calling hugetlb_no_page and set *pud to xxxx8e7(PRESENT)
3. CPU0: "!pud_present(*pud)" is false, continue
4. CPU0: pmd = pmd_offset(pud, addr) and maybe return a wrong pmdp
However, we want CPU0 to return NULL or pudp.

We can avoid this race by read the pud only once.

Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
---
 mm/hugetlb.c | 34 ++++++++++++++++++----------------
 1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index dd8737a..3bde229 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4908,31 +4908,33 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
 pte_t *huge_pte_offset(struct mm_struct *mm,
 		       unsigned long addr, unsigned long sz)
 {
-	pgd_t *pgd;
-	p4d_t *p4d;
-	pud_t *pud;
-	pmd_t *pmd;
+	pgd_t *pgdp;
+	p4d_t *p4dp;
+	pud_t *pudp, pud;
+	pmd_t *pmdp, pmd;
 
-	pgd = pgd_offset(mm, addr);
-	if (!pgd_present(*pgd))
+	pgdp = pgd_offset(mm, addr);
+	if (!pgd_present(*pgdp))
 		return NULL;
-	p4d = p4d_offset(pgd, addr);
-	if (!p4d_present(*p4d))
+	p4dp = p4d_offset(pgdp, addr);
+	if (!p4d_present(*p4dp))
 		return NULL;
 
-	pud = pud_offset(p4d, addr);
-	if (sz != PUD_SIZE && pud_none(*pud))
+	pudp = pud_offset(p4dp, addr);
+	pud = READ_ONCE(*pudp);
+	if (sz != PUD_SIZE && pud_none(pud))
 		return NULL;
 	/* hugepage or swap? */
-	if (pud_huge(*pud) || !pud_present(*pud))
-		return (pte_t *)pud;
+	if (pud_huge(pud) || !pud_present(pud))
+		return (pte_t *)pudp;
 
-	pmd = pmd_offset(pud, addr);
-	if (sz != PMD_SIZE && pmd_none(*pmd))
+	pmdp = pmd_offset(pudp, addr);
+	pmd = READ_ONCE(*pmdp);
+	if (sz != PMD_SIZE && pmd_none(pmd))
 		return NULL;
 	/* hugepage or swap? */
-	if (pmd_huge(*pmd) || !pmd_present(*pmd))
-		return (pte_t *)pmd;
+	if (pmd_huge(pmd) || !pmd_present(pmd))
+		return (pte_t *)pmdp;
 
 	return NULL;
 }
-- 
1.8.3.1