linux-ext4 - Re: 2.6.18-mm2: ext3 BUG?

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Date:	Mon, 23 Oct 2006 10:13:54 +0200
From:	Jan-Benedict Glaw <jbglaw@...-owl.de>
To:	Jan Kara <jack@...e.cz>
Cc:	Andrew Morton <akpm@...l.org>, Jiri Slaby <jirislaby@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	sct@...hat.com, adilger@...sterfs.com, linux-ext4@...r.kernel.org
Subject: Re: 2.6.18-mm2: ext3 BUG?

On Wed, 2006-10-11 12:42:02 +0200, Jan Kara <jack@...e.cz> wrote:
> > On Sun, 2006-10-08 08:33:30 +0200, Jan-Benedict Glaw <jbglaw@...-owl.de> wrote:
> > While I could reproduce it with a 200MB file, it seems I can't break
> > it with a 10MB file.
>   Hmm, I was running the test for several ours without any problem...
> The kernel is 2.6.17.6, ext3 in ordered data mode, standard SATA disk. I'm
> now running it again and trying my luck ;). What is your testing environment?

kolbe34-backup:/mnt# uname -a
Linux kolbe34-backup 2.6.17-2-686 #1 SMP Wed Sep 13 16:34:10 UTC 2006 i686 GNU/Linux
kolbe34-backup:/mnt# cat /proc/cpuinfo 
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 7
model name      : Pentium III (Katmai)
stepping        : 3
cpu MHz         : 448.674
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr sse up
bogomips        : 898.38
kolbe34-backup:/mnt# grep -i preem /boot/config-2.6.17-2-686 
CONFIG_PREEMPT_NONE=y
# CONFIG_PREEMPT_VOLUNTARY is not set
# CONFIG_PREEMPT is not set
# CONFIG_PREEMPT_BKL is not set
kolbe34-backup:/mnt# lspci 
00:00.0 Host bridge: Intel Corporation 440BX/ZX/DX - 82443BX/ZX/DX Host bridge (rev 03)
00:01.0 PCI bridge: Intel Corporation 440BX/ZX/DX - 82443BX/ZX/DX AGP bridge (rev 03)
00:07.0 ISA bridge: Intel Corporation 82371AB/EB/MB PIIX4 ISA (rev 02)
00:07.1 IDE interface: Intel Corporation 82371AB/EB/MB PIIX4 IDE (rev 01)
00:07.2 USB Controller: Intel Corporation 82371AB/EB/MB PIIX4 USB (rev 01)
00:07.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 02)
00:0e.0 Ethernet controller: Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE] (rev 16)
01:00.0 VGA compatible controller: ATI Technologies Inc 3D Rage Pro AGP 1X/2X (rev 5c)
kolbe34-backup:/mnt# lspci -n
00:00.0 0600: 8086:7190 (rev 03)
00:01.0 0604: 8086:7191 (rev 03)
00:07.0 0601: 8086:7110 (rev 02)
00:07.1 0101: 8086:7111 (rev 01)
00:07.2 0c03: 8086:7112 (rev 01)
00:07.3 0680: 8086:7113 (rev 02)
00:0e.0 0200: 1022:2000 (rev 16)
01:00.0 0300: 1002:4742 (rev 5c)
kolbe34-backup:~# hdparm -i /dev/hdb

/dev/hdb:

 Model=ST3300822A, FwRev=3.AAE, SerialNo=5NF24YCN
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
 BuffType=unknown, BuffSize=8192kB, MaxMultSect=16, MultSect=off
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=268435455
 IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4 
 DMA modes:  mdma0 mdma1 mdma2 
 UDMA modes: udma0 udma1 *udma2 udma3 udma4 udma5 
 AdvancedPM=no WriteCache=enabled
 Drive conforms to: Unspecified:  ATA/ATAPI-1 ATA/ATAPI-2 ATA/ATAPI-3 ATA/ATAPI-4 ATA/ATAPI-5 ATA/ATAPI-6 ATA/ATAPI-7

 * signifies the current active mode


Still running Debian's 2.6.17-2-686, I'm now tracking down the file
size when I start to see this type of corruption. Right now, it seems
I never get it with a 16384 KB (16 MB) large file, but I get it with a
21504 KB (21 MB) file.

Is there something important that changes handling of file contents in
the 16..21 MB range?

dumpe2fs output at http://lug-owl.de/~jbglaw/ext3-dumpe2fs.txt for
that filesystem.  I'll now run with a 18.5 MB file...

MfG, JBG

-- 
      Jan-Benedict Glaw      jbglaw@...-owl.de              +49-172-7608481
  Signature of:                           Wenn ich wach bin, träume ich.
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