PM / Hibernate: Do not crash kernel in free_basic_memory_bitmaps()

I have received a report about the BUG_ON() in free_basic_memory_bitmaps()
triggering mysteriously during an aborted s2disk hibernation attempt.
The only way I can explain that is that /dev/snapshot was first
opened for writing (resume mode), then closed and then opened again
for reading and closed again without freezing tasks.  In that case
the first invocation of snapshot_open() would set the free_bitmaps
flag in snapshot_state, which is a static variable.  That flag
wouldn't be cleared later and the second invocation of snapshot_open()
would just leave it like that, so the subsequent snapshot_release()
would see data->frozen set and free_basic_memory_bitmaps() would be
called unnecessarily.

To prevent that from happening clear data->free_bitmaps in
snapshot_open() when the file is being opened for reading (hibernate
mode).

In addition to that, replace the BUG_ON() in free_basic_memory_bitmaps()
with a WARN_ON() as the kernel can continue just fine if the condition
checked by that macro occurs.

Fixes: aab172891542 (PM / hibernate: Fix user space driven resume regression)
Reported-by: Oliver Lorenz <olli@olorenz.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: 3.12+ <stable@vger.kernel.org> # 3.12+

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 98c3b34a4cffcedeae812de0ddc947f874cef839..ac2d1f69490f38b46602168cdff5e753a0346aee 100644 (file)
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -792,7 +792,8 @@ void free_basic_memory_bitmaps(void)
 {
        struct memory_bitmap *bm1, *bm2;
 
-       BUG_ON(!(forbidden_pages_map && free_pages_map));
+       if (WARN_ON(!(forbidden_pages_map && free_pages_map)))
+               return;
 
        bm1 = forbidden_pages_map;
        bm2 = free_pages_map;

diff --git a/kernel/power/user.c b/kernel/power/user.c
index 957f06164ad1004b0050dbdcb7563c91c3755e55..ffc931c384ac97b2ce9c98204a458a42aebe7a62 100644 (file)
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -70,6 +70,7 @@ static int snapshot_open(struct inode *inode, struct file *filp)
                data->swap = swsusp_resume_device ?
                        swap_type_of(swsusp_resume_device, 0, NULL) : -1;
                data->mode = O_RDONLY;
+               data->free_bitmaps = false;
                error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
                if (error)
                        pm_notifier_call_chain(PM_POST_HIBERNATION);