On Tue, Aug 20, 2013 at 7:18 AM, Dave Jones <davej@xxxxxxxxxx> wrote:
>
> btw, anyone have thoughts on a patch something like below ?
And another(sorry if message is reformatted by the mail agent,
and it took my an hour to get the agent back to the correct format but failed,
and thanks a lot for any howto send plain text message).
Hillf
--- a/mm/memory.c Wed Aug 7 16:29:34 2013
+++ b/mm/memory.c Tue Aug 20 11:13:06 2013
@@ -933,8 +933,10 @@ again:
if (progress >= 32) {
progress = 0;
if (need_resched() ||
- spin_needbreak(src_ptl) || spin_needbreak(dst_ptl))
+ spin_needbreak(src_ptl) || spin_needbreak(dst_ptl)) {
+ BUG_ON(entry.val);
break;
+ }
}
if (pte_none(*src_pte)) {
progress++;
--
> It's really annoying to debug stuff like this and have to walk
> over to the machine and reboot it by hand after it wedges during swapoff.
>
> Dave
>
> diff --git a/mm/swapfile.c b/mm/swapfile.c
> index 6cf2e60..bbb1192 100644
> --- a/mm/swapfile.c
> +++ b/mm/swapfile.c
> @@ -1587,6 +1587,10 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
> if (!capable(CAP_SYS_ADMIN))
> return -EPERM;
>
> + /* If we have hit memory corruption, we could hang during swapoff, so don't even try. */
> + if (test_taint(TAINT_BAD_PAGE))
> + return -EINVAL;
> +
> BUG_ON(!current->mm);
>
> pathname = getname(specialfile);
--
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