[S390] fix recursive locking on page_table_lock

Suzuki Poulose reported the following recursive locking bug on s390:

Here is the stack trace : (see Appendix I for more info)

  [<0000000000406ed6>] _spin_lock+0x52/0x94
  [<0000000000103bde>] crst_table_free+0x14e/0x1a4
  [<00000000001ba684>] __pmd_alloc+0x114/0x1ec
  [<00000000001be8d0>] handle_mm_fault+0x2cc/0xb80
  [<0000000000407d62>] do_dat_exception+0x2b6/0x3a0
  [<0000000000114f8c>] sysc_return+0x0/0x8
  [<00000200001642b2>] 0x200001642b2

The page_table_lock is already acquired in __pmd_alloc (mm/memory.c) and
it tries to populate the pud/pgd with a new pmd allocated. If another
thread populates it before we get a chance, we free the pmd using
pmd_free().

On s390x, pmd_free(even pud_free ) is #defined to crst_table_free(),
which acquires the page_table_lock to protect the crst_table index updates.

Hence this ends up in a recursive locking of the page_table_lock.

The solution suggested by Dave Hansen is to use a new spin lock in the mmu
context to protect the access to the crst_list and the pgtable_list.

Reported-by: Suzuki Poulose <suzuki@in.ibm.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/include/asm/mmu.h b/arch/s390/include/asm/mmu.h
index 3b59216..03be999 100644 (file)
--- a/arch/s390/include/asm/mmu.h
+++ b/arch/s390/include/asm/mmu.h
@@ -2,6 +2,7 @@
 #define __MMU_H
 
 typedef struct {
+       spinlock_t list_lock;
        struct list_head crst_list;
        struct list_head pgtable_list;
        unsigned long asce_bits;

diff --git a/arch/s390/include/asm/pgalloc.h b/arch/s390/include/asm/pgalloc.h
index b2658b9..ddad590 100644 (file)
--- a/arch/s390/include/asm/pgalloc.h
+++ b/arch/s390/include/asm/pgalloc.h
@@ -140,6 +140,7 @@ static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 
 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 {
+       spin_lock_init(&mm->context.list_lock);
        INIT_LIST_HEAD(&mm->context.crst_list);
        INIT_LIST_HEAD(&mm->context.pgtable_list);
        return (pgd_t *) crst_table_alloc(mm, s390_noexec);

diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 5656672..c702152 100644 (file)
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -78,9 +78,9 @@ unsigned long *crst_table_alloc(struct mm_struct *mm, int noexec)
                }
                page->index = page_to_phys(shadow);
        }
-       spin_lock(&mm->page_table_lock);
+       spin_lock(&mm->context.list_lock);
        list_add(&page->lru, &mm->context.crst_list);
-       spin_unlock(&mm->page_table_lock);
+       spin_unlock(&mm->context.list_lock);
        return (unsigned long *) page_to_phys(page);
 }
 
@@ -89,9 +89,9 @@ void crst_table_free(struct mm_struct *mm, unsigned long *table)
        unsigned long *shadow = get_shadow_table(table);
        struct page *page = virt_to_page(table);
 
-       spin_lock(&mm->page_table_lock);
+       spin_lock(&mm->context.list_lock);
        list_del(&page->lru);
-       spin_unlock(&mm->page_table_lock);
+       spin_unlock(&mm->context.list_lock);
        if (shadow)
                free_pages((unsigned long) shadow, ALLOC_ORDER);
        free_pages((unsigned long) table, ALLOC_ORDER);
@@ -182,7 +182,7 @@ unsigned long *page_table_alloc(struct mm_struct *mm)
        unsigned long bits;
 
        bits = (mm->context.noexec || mm->context.has_pgste) ? 3UL : 1UL;
-       spin_lock(&mm->page_table_lock);
+       spin_lock(&mm->context.list_lock);
        page = NULL;
        if (!list_empty(&mm->context.pgtable_list)) {
                page = list_first_entry(&mm->context.pgtable_list,
@@ -191,7 +191,7 @@ unsigned long *page_table_alloc(struct mm_struct *mm)
                        page = NULL;
        }
        if (!page) {
-               spin_unlock(&mm->page_table_lock);
+               spin_unlock(&mm->context.list_lock);
                page = alloc_page(GFP_KERNEL|__GFP_REPEAT);
                if (!page)
                        return NULL;
@@ -202,7 +202,7 @@ unsigned long *page_table_alloc(struct mm_struct *mm)
                        clear_table_pgstes(table);
                else
                        clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE);
-               spin_lock(&mm->page_table_lock);
+               spin_lock(&mm->context.list_lock);
                list_add(&page->lru, &mm->context.pgtable_list);
        }
        table = (unsigned long *) page_to_phys(page);
@@ -213,7 +213,7 @@ unsigned long *page_table_alloc(struct mm_struct *mm)
        page->flags |= bits;
        if ((page->flags & FRAG_MASK) == ((1UL << TABLES_PER_PAGE) - 1))
                list_move_tail(&page->lru, &mm->context.pgtable_list);
-       spin_unlock(&mm->page_table_lock);
+       spin_unlock(&mm->context.list_lock);
        return table;
 }
 
@@ -225,7 +225,7 @@ void page_table_free(struct mm_struct *mm, unsigned long *table)
        bits = (mm->context.noexec || mm->context.has_pgste) ? 3UL : 1UL;
        bits <<= (__pa(table) & (PAGE_SIZE - 1)) / 256 / sizeof(unsigned long);
        page = pfn_to_page(__pa(table) >> PAGE_SHIFT);
-       spin_lock(&mm->page_table_lock);
+       spin_lock(&mm->context.list_lock);
        page->flags ^= bits;
        if (page->flags & FRAG_MASK) {
                /* Page now has some free pgtable fragments. */
@@ -234,7 +234,7 @@ void page_table_free(struct mm_struct *mm, unsigned long *table)
        } else
                /* All fragments of the 4K page have been freed. */
                list_del(&page->lru);
-       spin_unlock(&mm->page_table_lock);
+       spin_unlock(&mm->context.list_lock);
        if (page) {
                pgtable_page_dtor(page);
                __free_page(page);
@@ -245,7 +245,7 @@ void disable_noexec(struct mm_struct *mm, struct task_struct *tsk)
 {
        struct page *page;
 
-       spin_lock(&mm->page_table_lock);
+       spin_lock(&mm->context.list_lock);
        /* Free shadow region and segment tables. */
        list_for_each_entry(page, &mm->context.crst_list, lru)
                if (page->index) {
@@ -255,7 +255,7 @@ void disable_noexec(struct mm_struct *mm, struct task_struct *tsk)
        /* "Free" second halves of page tables. */
        list_for_each_entry(page, &mm->context.pgtable_list, lru)
                page->flags &= ~SECOND_HALVES;
-       spin_unlock(&mm->page_table_lock);
+       spin_unlock(&mm->context.list_lock);
        mm->context.noexec = 0;
        update_mm(mm, tsk);
 }

diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index e4868bf..5f91a38 100644 (file)
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -331,6 +331,7 @@ void __init vmem_map_init(void)
        unsigned long start, end;
        int i;
 
+       spin_lock_init(&init_mm.context.list_lock);
        INIT_LIST_HEAD(&init_mm.context.crst_list);
        INIT_LIST_HEAD(&init_mm.context.pgtable_list);
        init_mm.context.noexec = 0;