[Bug 12424] New: ext4_da_writepages error while downloading a file w/firefox

[Bug 12424] New: ext4_da_writepages error while downloading a file w/firefox

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=12424

           Summary: ext4_da_writepages error while downloading a file
                    w/firefox
           Product: File System
           Version: 2.5
     KernelVersion: 2.6.27.10
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@kernel-bugs.osdl.org
        ReportedBy: avery@shadypixel.com


Distribution:

Debian testing/unstable

Software Environment:

Kernel is actually from http://wiki.debian.org/DebianKernel. Version is
2.6.27-1~experimental.1~snapshot.12516, which appears to be based on 2.6.27.10.

Problem Description:

I was downloading a file in firefox when my machine starting beeping and I
repeatedly had a stacktrace printed to a terminal (see photo).

Steps to reproduce:

This may or may not be related, but ever since I backed up and restored to a
new ext4 filesystem, I've had a lot of trouble downloading stuff with firefox.
Symptoms are I'll get to 100% completed download and then it hangs. The
directory contains the normal .part but firefox never moves it to the proper
name (i.e. whatever.part -> whatever). Most stuff still downloads ok, but I'd
estimate since I've gone ext3->ext4 this has happened ~5 times. Also, I'm
pretty sure when this happens the download isn't 100% correct. The one time I
checked the md5sum did not match.


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[Bug 12424] ext4_da_writepages error while downloading a file w/firefox

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http://bugzilla.kernel.org/show_bug.cgi?id=12424





------- Comment #1 from avery@shadypixel.com  2009-01-10 19:53 -------
Created an attachment (id=19740)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=19740&action=view)
backtrace from console


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[Bug 12424] ext4_da_writepages error while downloading a file w/firefox

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http://bugzilla.kernel.org/show_bug.cgi?id=12424





------- Comment #2 from sandeen@redhat.com  2009-01-10 20:02 -------
This is journal_start failing:

                /* start a new transaction*/
                handle = ext4_journal_start(inode, needed_blocks);
                if (IS_ERR(handle)) {
                        ret = PTR_ERR(handle);
                        printk(KERN_EMERG "%s: jbd2_start: "
                               "%ld pages, ino %lu; err %d\n", __func__,
                                wbc->nr_to_write, inode->i_ino, ret);
                        dump_stack();
                        goto out_writepages;
                }

with error -30, which is EROFS.

Were there other messages before this, maybe an errors=remount-readonly sort of
filesystem problem?  Did the filesystem go readonly?


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[Bug 12424] ext4_da_writepages error while downloading a file w/firefox

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http://bugzilla.kernel.org/show_bug.cgi?id=12424





------- Comment #3 from avery@shadypixel.com  2009-01-10 20:08 -------
Yes, the filesystem went read only. Unfortunately, I wasn't in the room when it
happened and by the time I came in, dmesg was just filled with this backtrace.
If it helps, I snapped pictures of the fsck on reboot too. I'll attach those.


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[Bug 12424] ext4_da_writepages error while downloading a file w/firefox

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http://bugzilla.kernel.org/show_bug.cgi?id=12424





------- Comment #4 from avery@shadypixel.com  2009-01-10 20:08 -------
Created an attachment (id=19741)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=19741&action=view)
fsck part 1


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[Bug 12424] ext4_da_writepages error while downloading a file w/firefox

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------- Comment #5 from avery@shadypixel.com  2009-01-10 20:09 -------
Created an attachment (id=19742)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=19742&action=view)
fsck part 2


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[Bug 12424] ext4_da_writepages error while downloading a file w/firefox

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------- Comment #6 from tytso@mit.edu  2009-01-12 07:07 -------
There was at least one ext4 bug that could have caused this that was fixed in
2.6.28 as well as in the 2.6.29 merge window.   Unfortunately, we need to see
the original bug to know which bug might as caused the problem.   There was
also a more recent bug fix that makes ext4_da_writepages much less verbose,
since that tends to hide the original root cause of the problem....


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[Bug 12424] ext4_da_writepages error while downloading a file w/firefox

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Theodore Tso <tytso@mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tytso@mit.edu
         Regression|---                         |No




--- Comment #7 from Theodore Tso <tytso@mit.edu>  2009-05-19 18:41:23 ---
Any luck reproducing this problem, especially on a more recent kernel version?

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[Bug 12424] ext4_da_writepages error while downloading a file w/firefox

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--- Comment #8 from Avery Fay <avery@shadypixel.com>  2009-05-20 20:22:27 ---
This has not happened again both on 2.6.27 and on 2.6.29 (what I'm running
now).

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[Bug 12424] ext4_da_writepages error while downloading a file w/firefox

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Eric Sandeen <sandeen@redhat.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sandeen@redhat.com
         AssignedTo|fs_ext4@kernel-bugs.osdl.or |sandeen@redhat.com
                   |g                           |




--- Comment #9 from Eric Sandeen <sandeen@redhat.com>  2009-08-18 17:36:31 ---
Assigning to myself so I can close.

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