mm/ksm.c: don't WARN if page is still mapped in remove_stable_node()

BugLink: https://bugs.launchpad.net/bugs/1854975
commit 9a63236f1ad82d71a98aa80320b6cb618fb32f44 upstream.

It's possible to hit the WARN_ON_ONCE(page_mapped(page)) in
remove_stable_node() when it races with __mmput() and squeezes in
between ksm_exit() and exit_mmap().

  WARNING: CPU: 0 PID: 3295 at mm/ksm.c:888 remove_stable_node+0x10c/0x150

  Call Trace:
   remove_all_stable_nodes+0x12b/0x330
   run_store+0x4ef/0x7b0
   kernfs_fop_write+0x200/0x420
   vfs_write+0x154/0x450
   ksys_write+0xf9/0x1d0
   do_syscall_64+0x99/0x510
   entry_SYSCALL_64_after_hwframe+0x49/0xbe

Remove the warning as there is nothing scary going on.

Link: http://lkml.kernel.org/r/20191119131850.5675-1-aryabinin@virtuozzo.com
Fixes: cbf86cfe04a6 ("ksm: remove old stable nodes more thoroughly")
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/mm/ksm.c b/mm/ksm.c
index e65ff59bfaf67d16b311df0cda8ce2e4e0c05b0d..afda775813660bbe38a5621838c0616be99bc26d 100644 (file)
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -849,13 +849,13 @@ static int remove_stable_node(struct stable_node *stable_node)
                return 0;
        }
 
-       if (WARN_ON_ONCE(page_mapped(page))) {
-               /*
-                * This should not happen: but if it does, just refuse to let
-                * merge_across_nodes be switched - there is no need to panic.
-                */
-               err = -EBUSY;
-       } else {
+       /*
+        * Page could be still mapped if this races with __mmput() running in
+        * between ksm_exit() and exit_mmap(). Just refuse to let
+        * merge_across_nodes/max_page_sharing be switched.
+        */
+       err = -EBUSY;
+       if (!page_mapped(page)) {
                /*
                 * The stable node did not yet appear stale to get_ksm_page(),
                 * since that allows for an unmapped ksm page to be recognized