[Bug 23232] New: kernel hang on insert ext4 usb key

[Bug 23232] New: kernel hang on insert ext4 usb key

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https://bugzilla.kernel.org/show_bug.cgi?id=23232

           Summary: kernel hang on insert ext4 usb key
           Product: File System
           Version: 2.5
    Kernel Version: 2.6.37-rc2-git3
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@kernel-bugs.osdl.org
        ReportedBy: shal@free.fr
        Regression: No


Created an attachment (id=37592)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=37592)
error messages of the kernel

Hello,

On my 2.6.37-rc2-git3 (with sched_autogroup patch), my computer crash when I
insert an USB key formated in ext4. No problem if the  usb key is in vfat.

When the bug occured, I can used magic sys key but the sync works.

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[Bug 23232] kernel hang on insert ext4 usb key

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https://bugzilla.kernel.org/show_bug.cgi?id=23232


Theodore Tso <tytso@mit.edu> changed:

           What    |Removed                     |Added
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                 CC|                            |tytso@mit.edu




--- Comment #1 from Theodore Tso <tytso@mit.edu>  2010-11-19 03:00:59 ---
Does it crash if you boot some earlier version of the kernel?

Can you send an image of the USB key?

It looks like it's dieing very early the VFS layer, in vfs_kern_mount.  It's
not clear it's called into ext4 code at all when it gives the oops message.

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[Bug 23232] kernel hang on insert ext4 usb key

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https://bugzilla.kernel.org/show_bug.cgi?id=23232


Lukas Czerner <lczerner@redhat.com> changed:

           What    |Removed                     |Added
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                 CC|                            |lczerner@redhat.com




--- Comment #4 from Lukas Czerner <lczerner@redhat.com>  2010-11-19 14:02:31 ---
This might be related to a bug fixed with this patch. Can you try that to
confirm that it solve the issue ?

http://www.spinics.net/lists/linux-ext4/msg21743.html

Thanks!
-Lukas

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[Bug 23232] kernel hang on insert ext4 usb key

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https://bugzilla.kernel.org/show_bug.cgi?id=23232





--- Comment #5 from shal@free.fr  2010-11-19 15:30:27 ---
Thanks,

This seems to correct the kernel crash problem.

But during my test of insertion/removal the usb key , I have to performed
several time "fsck.ext4 -y"  without thousand of error corrected...
with this kind of error:
EXT4-fs (sdf1): ext4_check_descriptors: Checksum for group 0 failed (12243!=0)
EXT4-fs (sdf1): group descriptors corrupted!

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[Bug 23232] kernel hang on insert ext4 usb key

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https://bugzilla.kernel.org/show_bug.cgi?id=23232


Eric Sandeen <sandeen@redhat.com> changed:

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                 CC|                            |sandeen@redhat.com




--- Comment #6 from Eric Sandeen <sandeen@redhat.com>  2010-11-19 15:31:41 ---
Any chance you're pulling the key out without unmounting it first?

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[Bug 23232] kernel hang on insert ext4 usb key

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https://bugzilla.kernel.org/show_bug.cgi?id=23232





--- Comment #7 from shal@free.fr  2010-11-19 15:41:40 ---
I have done test without umount the key properly and sometime ugly.

The kernel crash problem is corrected by the patch.

The corruption of the filesystem is strange , I never seen this kind of
corruption (e.g. with lost of all data after fsck, the fsck takes 5 minutes,
even I have only insert/retrieve the key without performed any write on the
key).

One the same suite of tests with another ext4 usb key of only 1gb , there is no
problem in any case.

I am not sure that problems are linked

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[Bug 23232] kernel hang on insert ext4 usb key

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https://bugzilla.kernel.org/show_bug.cgi?id=23232





--- Comment #8 from Eric Sandeen <sandeen@redhat.com>  2010-11-19 15:45:48 ---
It may well be related to the firmware on the usb key, I don't think there's a
lot we can do on the ext4/kernel side.  (other than to "not crash" when it's
terribly corrupted)

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[Bug 23232] kernel hang on insert ext4 usb key

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https://bugzilla.kernel.org/show_bug.cgi?id=23232





--- Comment #9 from Theodore Tso <tytso@mit.edu>  2010-11-19 16:02:53 ---
I'm not convinced we even got into the ext4_fill_super(); if we did there
should have been at least some ext4 printk's.   The OOPS is in
vfs_kern_mount().

I've looked through ext4_fill_super(), and if vfs_kern_mount() had gotten as
far as calling into ext4_fill_super(), I can't find any code path other than
failing the first two memory allocations that wouldn't have resulted in some
kind of kernel printk --- which wasn't in the oops display.

So I strongly suspect the failure was before vfs_kern_mount() calling
ext4_mount(), or in mount_bdev() --- since all ext4_mount() does is call
mount_bdev() passing in ext4_fill_super as a callback function.

Can the oops be replicated at this point?   If so, we can try instrumenting the
kernel, but this strongly smells like a hardware problem and a failure in the
generic code before we drop into the ext4 mount code in ext4_fill_super().

-- Ted

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[Bug 23232] kernel hang on insert ext4 usb key

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Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
                 CC|                            |alan@lxorguk.ukuu.org.uk
         Resolution|                            |INSUFFICIENT_DATA




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