[Bug 11328] New: kernel 2.6.26 reports massive filesystem errors on RAID5 device; on 2.6.24 it is working but not well

[Bug 11328] New: kernel 2.6.26 reports massive filesystem errors on RAID5 device; on 2.6.24 it is working but not well

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=11328

           Summary: kernel 2.6.26 reports massive filesystem errors on RAID5
                    device;  on 2.6.24 it is working but not well
           Product: IO/Storage
           Version: 2.5
     KernelVersion: 2.6.24 / 2.6.26
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: IDE
        AssignedTo: io_ide@kernel-bugs.osdl.org
        ReportedBy: fpbeekhof@gmail.com


I'm running Ubuntu Hardy on a AMD64 machine with a RAID5 array in it, ext3
formatted. It has been working fine for years, with the exception of
Gutsy's kernel that couldn't handle that many IDE devices (bug 157909,
fixed in hardy).

To make backups, I bought an external drive and an eSata controller. The
controller is not supported in Hardy's kernel (2.6.24), but it is in
Intrepid, so I installed linux-image-2.6.26-5-generic from intrepid.

Running this kernel causes several changes:
1) My new controller is recognized
2) All disks are now known as /dev/sd* and not /dev/hd*
3) Copying from /dev/md0 results in many filesystem errors
4) e2fsck reports massive errors on the filesystem on /dev/md0

If I reboot into 2.6.24, all problems are gone and everything is back to
normal. This implies that there is a major problem somewhere! I happen
to mount the device read-only, but mounting it rw will no doubt result
in severe damage to the fs. I accidentally tested this by running e2fsck
under 2.6.26, which did introduce real errors that I then had to fix
under 2.6.24. Now, under 2.6.24, all is fine and 2.6.26 still reports
many errors.

Since then, Tejun Heo pointed out that under 2.6.24 were not that good either,
all disks on my HPT controller were working in PIO4 (but at least, without
error), and advised opening a bug report.

See attachments for details.


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[Bug 11328] kernel 2.6.26 reports massive filesystem errors on RAID5 device; on 2.6.24 it is working but not well

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=11328





------- Comment #1 from fpbeekhof@gmail.com  2008-08-14 01:05 -------
Created an attachment (id=17229)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=17229&action=view)
Dmesg of 2.6.24


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[Bug 11328] kernel 2.6.26 reports massive filesystem errors on RAID5 device; on 2.6.24 it is working but not well

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=11328





------- Comment #2 from fpbeekhof@gmail.com  2008-08-14 01:06 -------
Created an attachment (id=17230)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=17230&action=view)
dmesg of 2.6.26


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[Bug 11328] kernel 2.6.26 reports massive filesystem errors on RAID5 device; on 2.6.24 it is working but not well

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=11328





------- Comment #3 from fpbeekhof@gmail.com  2008-08-14 01:06 -------
Created an attachment (id=17231)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=17231&action=view)
list of PCI devices; obtained under 2.6.26


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[Bug 11328] kernel 2.6.26 reports massive filesystem errors on RAID5 device; on 2.6.24 it is working but not well

[bugme-daemon]

http://bugzilla.kernel.org/show_bug.cgi?id=11328


bzolnier@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|io_ide@kernel-bugs.osdl.org |bzolnier@gmail.com
             Status|NEW                         |ASSIGNED




------- Comment #4 from bzolnier@gmail.com  2008-08-14 01:37 -------
According to dmesg-2.6.24 all disks on HPT controller are using UDMA100 and
there are no error messages about dropping to PIO.

....
[   43.835503] hde: Maxtor 7L300R0, ATA DISK drive
[   43.835536] hde: host max PIO4 wanted PIO255(auto-tune) selected PIO4
[   43.837037] hde: UDMA/100 mode selected
[   43.838590] ide2 at 0x7000-0x7007,0x6802 on irq 16
[   43.838626] Probing IDE interface ide3...
[   44.127439] hdh: Maxtor 5A300J0, ATA DISK drive
[   44.463041] hdg: Maxtor 5A300J0, ATA DISK drive
[   44.463062] hdg: host max PIO4 wanted PIO255(auto-tune) selected PIO4
[   44.463201] hdg: UDMA/100 mode selected
[   44.463340] hdh: host max PIO4 wanted PIO255(auto-tune) selected PIO4
[   44.463472] hdh: UDMA/100 mode selected
[   44.463638] ide3 at 0x6400-0x6407,0x6002 on irq 16
[   44.463692] Probing IDE interface ide0...
[   44.750830] hdb: Maxtor 5A300J0, ATA DISK drive
[   45.086698] hda: Maxtor 5A300J0, ATA DISK drive
[   45.086721] hda: host max PIO4 wanted PIO255(auto-tune) selected PIO4
[   45.086858] hda: UDMA/100 mode selected
[   45.086997] hdb: host max PIO4 wanted PIO255(auto-tune) selected PIO4
[   45.087126] hdb: UDMA/100 mode selected
[   45.087295] ide0 at 0x8800-0x8807,0x8402 on irq 16
[   45.087351] Probing IDE interface ide1...
[   45.374370] hdd: Maxtor 5A300J0, ATA DISK drive
[   45.710125] hdc: Maxtor 5A300J0, ATA DISK drive
[   45.710147] hdc: host max PIO4 wanted PIO255(auto-tune) selected PIO4
[   45.710293] hdc: UDMA/100 mode selected
[   45.710432] hdd: host max PIO4 wanted PIO255(auto-tune) selected PIO4
[   45.710564] hdd: UDMA/100 mode selected
[   45.710728] ide1 at 0x8000-0x8007,0x7802 on irq 16
...

[ You can verify if DMA is really used by checking DMA enable setting with
  'hdparm -d /dev/device' and device speed with 'hdparm -Ttf /dev/device'. ]

HPT support in libata (SCSI emulation) is known to be experimental so I advise
to use IDE subsystem.  I'll re-assign the bug to the right people anyway.


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