On Tue, Sep 13, 2011 at 08:04:36AM +0200, Stefan Priebe - Profihost AG wrote:

I just reported it to the scsi list as i didn't knew where the
problems is. But then some people told be it must be a XFS problem.

Some more informations:
1.) It's running with 2.6.32 and 2.6.38
2.) I can also write to another ext2 part on the same disk
array(aacraid driver) while xfs stucks - so i think it must be an
xfs problem

That points a bit more towards XFS, although we've seen storage setups
create issues depending on the exact workload.  The prime culprit for
used to be the md software RAID driver, though.

3.) I've also tried running 3.1-rc5 but then i'm seeing this error:

BUG: unable to handle kernel NULL pointer dereference at 000000000000012c
IP: [] inode_dio_done+0x4/0x25

Oops, that's a bug that I actually introduced myself.  Fix below:


Index: linux-2.6/fs/xfs/xfs_aops.c
===================================================================

--- linux-2.6.orig/fs/xfs/xfs_aops.c	2011-09-13 16:38:47.141089046 -0400
+++ linux-2.6/fs/xfs/xfs_aops.c	2011-09-13 16:39:09.991647077 -0400

@@ -1300,6 +1300,7 @@ xfs_end_io_direct_write(
 	bool			is_async)
 {
 	struct xfs_ioend	*ioend = iocb->private;
+	struct inode		*inode = ioend->io_inode;
 
 	/*
 	 * blockdev_direct_IO can return an error even after the I/O

@@ -1331,7 +1332,7 @@ xfs_end_io_direct_write(
 	}
 
 	/* XXX: probably should move into the real I/O completion handler */
-	inode_dio_done(ioend->io_inode);
+	inode_dio_done(inode);
 }
 
 STATIC ssize_t

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