3.16.61-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Kiran Kumar Modukuri <kiran.modukuri@xxxxxxxxx>
commit 5ce83d4bb7d8e11e8c1c687d09f4b5ae67ef3ce3 upstream.
In cachefiles_mark_object_active(), the new object is marked active and
then we try to add it to the active object tree. If a conflicting object
is already present, we want to wait for that to go away. After the wait,
we go round again and try to re-mark the object as being active - but it's
already marked active from the first time we went through and a BUG is
issued.
Fix this by clearing the CACHEFILES_OBJECT_ACTIVE flag before we try again.
Analysis from Kiran Kumar Modukuri:
[Impact]
Oops during heavy NFS + FSCache + Cachefiles
CacheFiles: Error: Overlong wait for old active object to go away.
BUG: unable to handle kernel NULL pointer dereference at 0000000000000002
CacheFiles: Error: Object already active kernel BUG at
fs/cachefiles/namei.c:163!
[Cause]
In a heavily loaded system with big files being read and truncated, an
fscache object for a cookie is being dropped and a new object being
looked. The new object being looked for has to wait for the old object
to go away before the new object is moved to active state.
[Fix]
Clear the flag 'CACHEFILES_OBJECT_ACTIVE' for the new object when
retrying the object lookup.
[Testcase]
Have run ~100 hours of NFS stress tests and have not seen this bug recur.
[Regression Potential]
- Limited to fscache/cachefiles.
Fixes: 9ae326a69004 ("CacheFiles: A cache that backs onto a mounted filesystem")
Signed-off-by: Kiran Kumar Modukuri <kiran.modukuri@xxxxxxxxx>
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
fs/cachefiles/namei.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c
@@ -189,6 +189,7 @@ try_again:
/* an old object from a previous incarnation is hogging the slot - we
* need to wait for it to be destroyed */
wait_for_old_object:
+ clear_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags);
if (fscache_object_is_live(&object->fscache)) {
pr_err("\n");
pr_err("Error: Unexpected object collision\n");
@@ -250,7 +251,6 @@ wait_for_old_object:
goto try_again;
requeue:
- clear_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags);
cache->cache.ops->put_object(&xobject->fscache);
_leave(" = -ETIMEDOUT");
return -ETIMEDOUT;
