NFS: Fix "kernel BUG at fs/aio.c:554!"

commit 839f7ad6932d95f4d5ae7267b95c574714ff3d5b upstream.

Nick Piggin reports:

> I'm getting use after frees in aio code in NFS
>
> [ 2703.396766] Call Trace:
> [ 2703.396858]  [<ffffffff8100b057>] ? native_sched_clock+0x27/0x80
> [ 2703.396959]  [<ffffffff8108509e>] ? put_lock_stats+0xe/0x40
> [ 2703.397058]  [<ffffffff81088348>] ? lock_release_holdtime+0xa8/0x140
> [ 2703.397159]  [<ffffffff8108a2a5>] lock_acquire+0x95/0x1b0
> [ 2703.397260]  [<ffffffff811627db>] ? aio_put_req+0x2b/0x60
> [ 2703.397361]  [<ffffffff81039701>] ? get_parent_ip+0x11/0x50
> [ 2703.397464]  [<ffffffff81612a31>] _raw_spin_lock_irq+0x41/0x80
> [ 2703.397564]  [<ffffffff811627db>] ? aio_put_req+0x2b/0x60
> [ 2703.397662]  [<ffffffff811627db>] aio_put_req+0x2b/0x60
> [ 2703.397761]  [<ffffffff811647fe>] do_io_submit+0x2be/0x7c0
> [ 2703.397895]  [<ffffffff81164d0b>] sys_io_submit+0xb/0x10
> [ 2703.397995]  [<ffffffff8100307b>] system_call_fastpath+0x16/0x1b
>
> Adding some tracing, it is due to nfs completing the request then
> returning something other than -EIOCBQUEUED, so aio.c
> also completes the request.

To address this, prevent the NFS direct I/O engine from completing
async iocbs when the forward path returns an error without starting
any I/O.

This fix appears to survive ^C during both "xfstest no. 208" and "fsx
-Z."

It's likely this bug has existed for a very long while, as we are seeing
very similar symptoms in OEL 5.  Copying stable.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 84d3c8b902068a057805e33c9533ffda7f6c0100..e0e9d49773bd14aaed1eb40d235c2b0f173ab03d 100644 (file)
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -407,15 +407,18 @@ static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq,
                pos += vec->iov_len;
        }
 
+       /*
+        * If no bytes were started, return the error, and let the
+        * generic layer handle the completion.
+        */
+       if (requested_bytes == 0) {
+               nfs_direct_req_release(dreq);
+               return result < 0 ? result : -EIO;
+       }
+
        if (put_dreq(dreq))
                nfs_direct_complete(dreq);
-
-       if (requested_bytes != 0)
-               return 0;
-
-       if (result < 0)
-               return result;
-       return -EIO;
+       return 0;
 }
 
 static ssize_t nfs_direct_read(struct kiocb *iocb, const struct iovec *iov,
@@ -841,15 +844,18 @@ static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq,
                pos += vec->iov_len;
        }
 
+       /*
+        * If no bytes were started, return the error, and let the
+        * generic layer handle the completion.
+        */
+       if (requested_bytes == 0) {
+               nfs_direct_req_release(dreq);
+               return result < 0 ? result : -EIO;
+       }
+
        if (put_dreq(dreq))
                nfs_direct_write_complete(dreq, dreq->inode);
-
-       if (requested_bytes != 0)
-               return 0;
-
-       if (result < 0)
-               return result;
-       return -EIO;
+       return 0;
 }
 
 static ssize_t nfs_direct_write(struct kiocb *iocb, const struct iovec *iov,