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Date:	Tue, 31 Jul 2012 11:18:10 +0100 (GMT+01:00)
From:	Ľubomír Varga <varga@...intext.sk>
To:	Theodore Ts'o <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org, info <info@...intext.sk>
Subject: Re: ext4 unknown problem

I have used strace on described process (sync and umount):

This is "sudo sync" proces:

$ sudo strace -p 24933
Process 24933 attached
select(6, [3 5], [], NULL, NULL

This one is umount:

$ sudo strace -p 12103
Process 12103 attached

By for now.

----- luvar@...intext.sk wrote:

> Hi,
> dmesg is probably useles:
> 
> Probably some logs after mounting...:
> 
> # dmesg | grep EXT
> EXT3-fs (md2): mounted filesystem with ordered data mode
> EXT3-fs (md2): using internal journal
> EXT3-fs (dm-2): using internal journal
> EXT3-fs (dm-2): mounted filesystem with ordered data mode
> EXT4-fs (dm-8): mounted filesystem with ordered data mode. Opts:
> (null)
> EXT4-fs (dm-3): mounted filesystem with ordered data mode. Opts:
> (null)
> EXT4-fs (dm-12): mounted filesystem without journal. Opts: (null)
> EXT4-fs (dm-8): re-mounted. Opts: commit=0
> EXT4-fs (dm-3): re-mounted. Opts: commit=0
> EXT4-fs (dm-12): re-mounted. Opts: commit=0
> EXT4-fs (dm-28): mounted filesystem with ordered data mode. Opts:
> (null)
> EXT3-fs (dm-10): using internal journal
> EXT3-fs (dm-10): mounted filesystem with ordered data mode
> 
> On last few lines, there is some info about usb key used on thic pc:
> 
> # dmesg | tail -n 30
> sd 14:0:0:0: [sdg] Asking for cache data failed
> sd 14:0:0:0: [sdg] Assuming drive cache: write through
>  sdg: sdg1
> sd 14:0:0:0: [sdg] Asking for cache data failed
> sd 14:0:0:0: [sdg] Assuming drive cache: write through
> sd 14:0:0:0: [sdg] Attached SCSI disk
> mdadm: sending ioctl 1261 to a partition!
> mdadm: sending ioctl 1261 to a partition!
> usb 2-4.4: USB disconnect, device number 10
> hda-intel: IRQ timing workaround is activated for card #0. Suggest a
> bigger bdl_pos_adj.
> usb 1-1: new high-speed USB device number 2 using ehci_hcd
> usb 1-1: New USB device found, idVendor=0951, idProduct=1687
> usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> usb 1-1: Product: DT R400
> usb 1-1: Manufacturer: Kingston
> usb 1-1: SerialNumber: 0018F30C7FX10B000XX029
> scsi15 : usb-storage 1-1:1.0
> scsi 15:0:0:0: Direct-Access     Kingston DT R400          PMAP PQ: 0
> ANSI: 0 CCS
> sd 15:0:0:0: Attached scsi generic sg6 type 0
> sd 15:0:0:0: [sdg] 7774208 512-byte logical blocks: (3.98 GB/3.70
> GiB)
> sd 15:0:0:0: [sdg] Write Protect is off
> sd 15:0:0:0: [sdg] Mode Sense: 23 00 00 00
> sd 15:0:0:0: [sdg] No Caching mode page present
> sd 15:0:0:0: [sdg] Assuming drive cache: write through
> sd 15:0:0:0: [sdg] No Caching mode page present
> sd 15:0:0:0: [sdg] Assuming drive cache: write through
>  sdg: sdg1 sdg2
> sd 15:0:0:0: [sdg] No Caching mode page present
> sd 15:0:0:0: [sdg] Assuming drive cache: write through
> sd 15:0:0:0: [sdg] Attached SCSI removable disk
> 
> Other lines from dmesg seems not relevant. Should I post them too?
> 
> PS: Writing to disk from jbd2/dm-3-8 still active (iotop shows it
> still on top of I/O activity).
> 
> LuVar
> 
> ----- "Theodore Ts'o" <tytso@....edu> wrote:
> 
> > On Mon, Jul 30, 2012 at 08:26:20PM +0100, LuVar wrote:
> > > Hi,
> > > I have seriouse issue here. I have copyied about 7GB files to one
> of
> > my ext4 partitions and from that point of time there is sustained
> > write to that partition from jbd2/dm-3-8 process. I have lunched
> "sudo
> > sync" command (about day ago :) and a few hours a after sync start,
> I
> > have tryied to use umount on that partition... Booth of them are
> still
> > running...
> > > 
> > > I have no serious data there, but if I could be helpfull in
> > bugreport, give me some info what to do.
> > 
> > Try running the dmesg command, and see if there's anything
> > interesting
> > there.  If you're not sure if it's interesting, send it to us and
> we
> > can take a quick look at it.
> > 
> > Regards,
> > 
> > 					- Ted

-- 
Ing. Ľubomír Varga
+421 (0)908 541 700
varga@...intext.sk
www.plaintext.sk
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