Re: possible bug ?

On 9/19/12 11:30 AM, Eric Sandeen wrote:

On 9/19/12 11:26 AM, Theodore Ts'o wrote:

quoted

On Wed, Sep 19, 2012 at 10:13:46AM -0500, Eric Sandeen wrote:

quoted

On 9/19/12 9:44 AM, Adrian Sandu wrote:

quoted

Hi people,

While trying to delete a couple of files today, I got into this lil'
thingy. It first happened in mc, then at a reboot.

Did you cut off a few lines before this?  Like one that said NULL pointer
dereference, or BUG() at .... or something similar?

I think we have a few reports of this in the fedora bugzilla, I don't
think we've gotten to the bottom of it yet.

The fix is in mainline, and backported to v3.5.3.  If Fedora's kernel
hasn't been updated to v3.5.3, it would be great if you could
encourage an update to get pushed out.

Hm I thought we had a similar bug on 3.5.3 so didn't think
it was fixed.   let me check ... Nope sorry, it was older.

Thanks for the info, sorry I had missed it.

Actually argh, too many bugs.  ;)  I was thinking of 
https://bugzilla.redhat.com/show_bug.cgi?id=857618

which has been reported a few times, and hits a BUG() in 

1965 ext4_ext_put_in_cache(struct inode *inode, ext4_lblk_t block,
1966                         __u32 len, ext4_fsblk_t start)
1967 {
1968         struct ext4_ext_cache *cex;
1969         BUG_ON(len == 0);

but that's not what this reporter sees, sorry for the noise.

(Lukas pointed at upstream commit 31d4f3a2f3c73f279ff96a7135d7202ef6833f12
to avoid the BUG_ON but we still don't know the root cause I think).

Anyway, now I'm OT for this thread.

-Eric