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#1 2011-02-15 00:43:08

airencracken
Member
From: California
Registered: 2010-04-17
Posts: 23

After new kernel boot takes signifcantly longer [SOLVED]

The boot seems to hang in two places. Once when it's loading my CD drive, and on processing udev events.

I've found this in the error.log

Feb 14 16:35:21 localhost kernel: ata6.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
Feb 14 16:35:21 localhost kernel: ata6.00: failed command: IDENTIFY PACKET DEVICE
Feb 14 16:35:21 localhost kernel: ata6.00: cmd a1/00:01:00:00:00/00:00:00:00:00/00 tag 0 pio 512 in
Feb 14 16:35:21 localhost kernel: res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
Feb 14 16:35:21 localhost kernel: ata6.00: status: { DRDY }
Feb 14 16:35:21 localhost kernel: ata6.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
Feb 14 16:35:21 localhost kernel: ata6.00: failed command: IDENTIFY PACKET DEVICE
Feb 14 16:35:21 localhost kernel: ata6.00: cmd a1/00:01:00:00:00/00:00:00:00:00/00 tag 0 pio 512 in
Feb 14 16:35:21 localhost kernel: res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
Feb 14 16:35:21 localhost kernel: ata6.00: status: { DRDY }

Any ideas? This problem only showed up with a recent pacman -Syu.

Last edited by airencracken (2011-02-24 00:32:45)

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#2 2011-02-19 01:27:01

azleifel
Member
Registered: 2007-10-28
Posts: 484

Re: After new kernel boot takes signifcantly longer [SOLVED]

It's a problem with udev-165 that persists in udev-166.  I posted my version of the same problem at https://bbs.archlinux.org/viewtopic.php … 47#p883847 and the only effective solutions I've found are to either downgrade to udev-164 or remove the "Use ata_id, not scsi_id, on ATAPI devices" code from udev-165.

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#3 2011-02-20 02:52:16

azleifel
Member
Registered: 2007-10-28
Posts: 484

Re: After new kernel boot takes signifcantly longer [SOLVED]

For the record, I have a workaround.  The "Use ata_id, not scsi_id, on ATAPI devices" commit in udev-165 uses a 16-byte ATA pass through command to identify ATAPI cdrom drives, apparently to avoid clashing with the MMC BLANK command.  That's something akin to running

$ sg_sat_identify -vv -p -l 16 /dev/dvd

which fails on my PC (Samsung SH-S223C SATA CD/DVD drive, AHCI enabled) with

open /dev/dvd with flags=0x802
    ATA pass through (16) cdb: 85 08 0e 00 00 00 01 00 00 00 00 00 00 00 a1 00 
ioctl(SG_IO v3) failed: Bad address (errno=14)
ATA pass through (16): os error: Bad address
ATA pass through (16) failed

This probably means that the Samsung drive doesn't like 16-byte pass through commands, though I guess that there could be some other reason for the failure.  Whatever, after some research I found that the libata kernel module has an "atapi_passthru16" option that can be used to disable 16-byte ATA pass through commands and since doing that I've had no

Feb 19 00:45:36 localhost kernel: ata3.00: failed command: IDENTIFY PACKET DEVICE

errors with udev-165 installed, either during boot or when mounting/unmounting CDs and DVDs,  processing udev uevents takes no longer than normal, CDs still burn properly with cdrecord, there have been no unwanted attempts to blank a CD or DVD left in the drive and, as a bonus, the old double eject problem (tray opens, tray closes, tray opens again) has gone away...for now!

Implementation:

  • Add

    options libata atapi_passthru16=0

    to /etc/modprobe.d/modprobe.conf

  • Add

    FILES="/etc/modprobe.d/modprobe.conf"

    to /etc/mkinitcpio.conf

  • (Install udev-165)

  • Rebuild the kernel image with mkinitcpio

  • Reboot

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#4 2011-02-23 05:08:48

airencracken
Member
From: California
Registered: 2010-04-17
Posts: 23

Re: After new kernel boot takes signifcantly longer [SOLVED]

Wicked. I'm going to try this asap and let you know how it goes. Thanks for the help!

Edit

Worked great! Thanks for the assist. I was pretty stumped.

Last edited by airencracken (2011-02-23 05:49:01)

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#5 2011-02-23 19:28:35

azleifel
Member
Registered: 2007-10-28
Posts: 484

Re: After new kernel boot takes signifcantly longer [SOLVED]

Good news!  Don't forget to mark this thread [solved] ;-)

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#6 2012-03-17 10:06:46

Lucagb
Member
Registered: 2012-03-17
Posts: 1

Re: After new kernel boot takes signifcantly longer [SOLVED]

azleifel wrote:

For the record, I have a workaround.  The "Use ata_id, not scsi_id, on ATAPI devices" commit in udev-165 uses a 16-byte ATA pass through command to identify ATAPI cdrom drives, apparently to avoid clashing with the MMC BLANK command.  That's something akin to running

$ sg_sat_identify -vv -p -l 16 /dev/dvd

which fails on my PC (Samsung SH-S223C SATA CD/DVD drive, AHCI enabled) with

open /dev/dvd with flags=0x802
    ATA pass through (16) cdb: 85 08 0e 00 00 00 01 00 00 00 00 00 00 00 a1 00 
ioctl(SG_IO v3) failed: Bad address (errno=14)
ATA pass through (16): os error: Bad address
ATA pass through (16) failed

This probably means that the Samsung drive doesn't like 16-byte pass through commands, though I guess that there could be some other reason for the failure.  Whatever, after some research I found that the libata kernel module has an "atapi_passthru16" option that can be used to disable 16-byte ATA pass through commands and since doing that I've had no

Feb 19 00:45:36 localhost kernel: ata3.00: failed command: IDENTIFY PACKET DEVICE

errors with udev-165 installed, either during boot or when mounting/unmounting CDs and DVDs,  processing udev uevents takes no longer than normal, CDs still burn properly with cdrecord, there have been no unwanted attempts to blank a CD or DVD left in the drive and, as a bonus, the old double eject problem (tray opens, tray closes, tray opens again) has gone away...for now!

Implementation:

  • Add

    options libata atapi_passthru16=0

    to /etc/modprobe.d/modprobe.conf

  • Add

    FILES="/etc/modprobe.d/modprobe.conf"

    to /etc/mkinitcpio.conf

  • (Install udev-165)

  • Rebuild the kernel image with mkinitcpio

  • Reboot

Thanks a lot,
I'm an italian Chakra's user,
I had this problem to many months and thanks to you I have solved
grazie 1000
smile

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