[PATCH 1/1] LogFS: Kernel BUG at readwrite.c:1193

[Prasad Joshi]

This happens when __logfs_create() tries to write a new inode to the
disk which is full.

__logfs_create() associates the transaction pointer with inode. During
the logfs_write_inode() function call chain this transaction pointer
is moved from inode to page->private using function move_inode_to_page
(do_write_inode() -> inode_to_page() -> move_inode_to_page)

When the write inode fails, the transaction is aborted and iput is
called on the failed inode. During delete_inode the same transaction
pointer associated with the page is getting used. Thus causing kernel
BUG.

The patch checks for error in write_inode() and restores the
page->private to NULL.


Signed-off-by: Prasad Joshi <prasadjoshi124@xxxxxxxxx>
---
diff --git a/fs/logfs/readwrite.c b/fs/logfs/readwrite.c
index 6127baf..ee99a9f 100644
--- a/fs/logfs/readwrite.c
+++ b/fs/logfs/readwrite.c
@@ -1994,6 +1994,9 @@ static int do_write_inode(struct inode *inode)

        /* FIXME: transaction is part of logfs_block now.  Is that enough? */
        err = logfs_write_buf(master_inode, page, 0);
+       if (err)
+               move_page_to_inode(inode, page);
+
        logfs_put_write_page(page);
        return err;
 }



---------- Forwarded message ----------
From:  <bugzilla-daemon@xxxxxxxxxxxxxxxxxxx>
Date: Tue, Nov 16, 2010 at 3:20 PM
Subject: [Bug 20162] [LogFS][2.6.36.rc7+] Kernel BUG at readwrite.c:1193
To: prasadjoshi124@xxxxxxxxx


https://bugzilla.kernel.org/show_bug.cgi?id=20162


Florian Mickler <florian@xxxxxxxxxxx> changed:

          What    |Removed                     |Added
----------------------------------------------------------------------------
            Status|NEW                         |RESOLVED
                CC|                            |florian@xxxxxxxxxxx
        Resolution|                            |PATCH_ALREADY_AVAILABLE




--- Comment #2 from Florian Mickler <florian@xxxxxxxxxxx>  2010-11-16
15:20:46 ---
Can you submit that patch to lkml and cc the logfs maintainer and the logfs
list?
(Joern Engel <joern@xxxxxxxxx>, logfs@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx)

See Documentation/SubmittingPatches

Patch: https://bugzilla.kernel.org/show_bug.cgi?id=20162#c1

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