linux-ext4 - Re: e2fsck not fixing deleted inode referenced errors?

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Date:	Tue, 30 Sep 2014 13:36:22 -0700
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	Zlatko Calusic <zcalusic@...sync.net>
Cc:	"Theodore Ts'o" <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: e2fsck not fixing deleted inode referenced errors?

On Tue, Sep 30, 2014 at 10:27:12PM +0200, Zlatko Calusic wrote:
> On 30.09.2014 21:54, Theodore Ts'o wrote:
> >On Tue, Sep 30, 2014 at 08:43:04PM +0200, Zlatko Calusic wrote:
> >>Full error message from the kernel log, together with data check I did in
> >>the evening:
> >>
> >>Sep 29 05:07:51 atlas kernel: ata2.00: exception Emask 0x10 SAct 0x0 SErr
> >>0x4010000 action 0xe frozen
> >>Sep 29 05:07:51 atlas kernel: ata2.00: irq_stat 0x00400040, connection
> >>status changed
> >>Sep 29 05:07:51 atlas kernel: ata2: SError: { PHYRdyChg DevExch }
> >>Sep 29 05:07:51 atlas kernel: ata2.00: failed command: FLUSH CACHE EXT
> >>Sep 29 05:07:51 atlas kernel: ata2.00: cmd
> >>ea/00:00:00:00:00/00:00:00:00:00/a0 tag 0\x0a         res
> >>40/00:f4:e2:7f:14/00:00:3a:00:00/40 Emask 0x10 (ATA bus error)
> >>Sep 29 05:07:51 atlas kernel: ata2.00: status: { DRDY }
> >>Sep 29 05:07:51 atlas kernel: ata2: hard resetting link
> >>Sep 29 05:07:57 atlas kernel: ata2: link is slow to respond, please be
> >>patient (ready=0)
> >>Sep 29 05:08:00 atlas kernel: ata2: SATA link up 3.0 Gbps (SStatus 123
> >>SControl 300)
> >>Sep 29 05:08:00 atlas kernel: ata2.00: configured for UDMA/133
> >>Sep 29 05:08:00 atlas kernel: ata2.00: retrying FLUSH 0xea Emask 0x10
> >>Sep 29 05:08:00 atlas kernel: ata2: EH complete
> >
> >That looks really bad; it sounds like you have a hardware error on at
> >least one of your disks.  Have you tried running running badblocks on
> >both disks to make sure the disk isn't flagging more bad blocks, and
> >then resynchronizing the RAID 1 array?   Then try running e2fsck again.
> >
> 
> Yep, both disks are pretty old, somewhere at the end of warranty.
> Yet the interesting thing is that exactly that error (FLUSH CACHE
> EXT) happened from time to time, say once a year, but never before I
> got in such trouble that e2fsck wouldn't save the day after one
> quick run.
> 
> I now remember Darrick also asked for smartctl data. Here it is:
> 
> /dev/sda
> ========
> Power_On_Hours 40984
> 
> and only 2 SMART READ/WRITE LOG errors in the log from long time ago...
> 
> ATA Error Count: 2
> Error 1 occurred at disk power-on lifetime: 14493 hours (603 days +
> 21 hours)
> Error 2 occurred at disk power-on lifetime: 14493 hours (603 days +
> 21 hours)

Yes, that looks like SMART commands colliding, i.e. not a media error.

> Full: http://pastebin.com/GnQhACXf
> 
> /dev/sdb (I believe the disk responsible for the problem)

sysfs will tell you:

$ ls /sys/block/sd*
lrwxrwxrwx 1 root root 0 Sep 30 13:31 /sys/block/sda ->
../devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/block/sda/

                                   ^^^^

(So on this system, sda is ata1.00.)

> ========
> Power_On_Hours 40978
> 
> No Errors Logged
> 
> Full: http://pastebin.com/nUB2q0Tk
> 
> Unless you have other ideas, I will run badblocks. Although, as ext4
> fs is on /dev/md2, I think I should run it on /dev/md2 only? Do you
> really mean to run it on /dev/sda2, /dev/sdb2 - underlying devices?
> I'm not sure how MD would cope with it.

Both drives, individually.

md should be fine with that, since you're only running the read test.

It would be fun to be able to poke around with an 'e2image /dev/md2' file, but
given the 1TB volume that might be unmanageable.

> But, I'm pretty sure that it will come out clean. The md check I did
> last night would surely detected bad blocks if there were any. Or
> not?

Let's hope so, unless it's some weird transient error...

--D
> 
> Thanks for your help!
> -- 
> Zlatko
> 
> --
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