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Date:	Thu, 03 Jan 2013 18:26:05 +0100
From:	Jan Schmidt <>
To:	Mathieu Chouquet-Stringer <>
Subject: Re: GPF in read_extent_buffer while scrubbing on 3.7.0-rc8-00014-g27d7c2a

Hi Mathieu,

Sorry for the late reply. I had quite a good reproducer once for what I suspect
may be your problem here - but it suddenly stopped reproducing the problem and I
still haven't figured out why. (see
if you're interested)

Can you please give the following patch a try and report back if it helps you
(apply on top of cmason/for-linus, 57ba86c)? If it doesn't, you've got three

a) forget about the problem
b) send me a dump of your whole file system (space can be provided)
c) receive debug patches, apply them and send me the output


diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 65f0367..d51185e 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3324,8 +3324,6 @@ int close_ctree(struct btrfs_root *root)


-	btrfs_scrub_cancel(fs_info);
 	/* wait for any defraggers to finish */
 		   (atomic_read(&fs_info->defrag_running) == 0));
@@ -3392,6 +3390,7 @@ int close_ctree(struct btrfs_root *root)
+	btrfs_scrub_cancel(fs_info);

 	if (btrfs_test_opt(root, CHECK_INTEGRITY))
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