mremap's move_vma is applying __vm_stat_account to the old vma which may
have already been freed: move it to just before the do_munmap.
mremapping to and fro with CONFIG_DEBUG_SLAB=y showed /proc/<pid>/status
VmSize and VmData wrapping just like in kernel bugzilla #4842, and fixed
by this patch - worth including in 2.6.13, though not yet confirmed that
it fixes that specific report from Frank van Maarseveen.
Signed-off-by: Hugh Dickins <[email protected]>
--- 2.6.13-rc5-git2/mm/mremap.c 2005-06-17 20:48:29.000000000 +0100
+++ linux/mm/mremap.c 2005-08-03 16:22:33.000000000 +0100
@@ -229,6 +229,7 @@ static unsigned long move_vma(struct vm_
* since do_munmap() will decrement it by old_len == new_len
*/
mm->total_vm += new_len >> PAGE_SHIFT;
+ __vm_stat_account(mm, vma->vm_flags, vma->vm_file, new_len>>PAGE_SHIFT);
if (do_munmap(mm, old_addr, old_len) < 0) {
/* OOM: unable to split vma, just get accounts right */
@@ -243,7 +244,6 @@ static unsigned long move_vma(struct vm_
vma->vm_next->vm_flags |= VM_ACCOUNT;
}
- __vm_stat_account(mm, vma->vm_flags, vma->vm_file, new_len>>PAGE_SHIFT);
if (vm_flags & VM_LOCKED) {
mm->locked_vm += new_len >> PAGE_SHIFT;
if (new_len > old_len)
-
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