Date:	Sat, 21 Jul 2007 04:20:57 +0200
From:	"Kay Sievers" <kay.sievers@...y.org>
To:	"Dave Jones" <davej@...hat.com>,
	"Kay Sievers" <kay.sievers@...y.org>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: film at 11: kernel update breaks udev.

On 7/21/07, Kay Sievers <kay.sievers@...y.org> wrote:
> On 7/21/07, Dave Jones <davej@...hat.com> wrote:
> > On Sat, Jul 21, 2007 at 03:28:12AM +0200, Kay Sievers wrote:
> >  > On 7/21/07, Dave Jones <davej@...hat.com> wrote:
> >  > > On Sat, Jul 21, 2007 at 03:09:55AM +0200, Kay Sievers wrote:
> >  > >  > On 7/21/07, Dave Jones <davej@...hat.com> wrote:
> >  > >  > > Just one of my machines to 2.6.22.1, and got this during boot..
> >  > >  > >
> >  > >  > > Starting udev: udevd-event[619]: udev_node_symlink: symlink(../../sdc/dev/disk/by-uuid/2d773baf-8174-10a6-14db-a78e0e676e89) failed: File exists
> >  > >  > >
> >  > >  > > Under 2.6.21, all was fine.
> >  > >  > >
> >  > >  > > sdc is one disk of a 3 disk raid5 set.
> >  > >  > > The raidset still manages to come up despite this.
> >  > >  > >
> >  > >  > > This is a Fedora 7 box, with udev-106-4.1.fc7
> >  > >  > >
> >  > >  > > What changed this time?
> >  > >  >
> >  > >  > CONFIG_BLK_DEV_BSG=y?
> >  > >  >
> >  > >  > There's a name-clash, because bsg tries to create devices with the same name.
> >  > >  > James sent a patch, it's on lkml.
> >  > >
> >  > > BSG isn't in 2.6.22
> >  >
> >  > Ok. There has nothing else changed, that I could think of what could cause this.
> >  >
> >  > The code in udev that prints this message looks like:
> >  >    err("symlink(%s, %s) failed: %s", linktarget, filename, strerror(errno));
> >  >
> >  > That doesn't really match what you posted. Are there chars missing?
> >
> > Umm. Now I'm confused. Note above that it's talking about sdc.
> > /dev/disk/by-uuid/ contains ..
> >
> > lrwxrwxrwx 1 root root  9 2007-07-17 20:35 2d773baf-8174-10a6-14db-a78e0e676e89 -> ../../sdd
> > lrwxrwxrwx 1 root root 10 2007-07-20 18:44 3B69-1AFD -> ../../sdl1
> > lrwxrwxrwx 1 root root 10 2007-07-20 19:06 46A1-3FCB -> ../../sdi1
> > lrwxrwxrwx 1 root root 10 2007-07-17 20:35 4e728818-fcf1-21ee-07a5-302b72bc6129 -> ../../sdc1
> > lrwxrwxrwx 1 root root 10 2007-07-17 20:35 5f435361-5797-4a8c-a285-c72fa455d401 -> ../../sda1
> > lrwxrwxrwx 1 root root  9 2007-07-17 20:35 9502a546-dd98-41df-8916-45032d801b69 -> ../../md0
> > lrwxrwxrwx 1 root root 10 2007-07-17 20:35 ed102ac9-5615-c34b-5fe7-1a9029705ebf -> ../../sda2
> >
> > note that uuid matches sdd instead.
> >
> >  > And what does:
> >  >   udevtest /block/sdc
> >  > print?
> >
> > parse_file: reading '/etc/udev/rules.d/05-udev-early.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/40-multipath.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/50-udev.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/60-libsane.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/60-net.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/60-pcmcia.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/60-wacom.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/85-pcscd_ccid.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/85-pcscd_egate.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/90-alsa.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/90-hal.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/95-pam-console.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/bluetooth.rules' as rules file
> > This program is for debugging only, it does not create any node,
> > or run any program specified by a RUN key. It may show incorrect results,
> > if rules match against subsystem specfic kernel event variables.
> >
> > main: looking at device '/block/sdc' from subsystem 'block'
> > run_program: '/bin/bash -c '/sbin/lsmod | /bin/grep ^dm_multipath''
> > run_program: '/bin/bash' (stdout) 'dm_multipath           28889  0 '
> > run_program: '/bin/bash' returned with status 0
> > run_program: '/lib/udev/usb_id -x'
> > run_program: '/lib/udev/usb_id' returned with status 1
> > run_program: '/lib/udev/scsi_id -g -x -s /block/sdc -d /dev/.tmp-8-32'
> > run_program: '/lib/udev/scsi_id' (stdout) 'ID_VENDOR=ATA'
> > run_program: '/lib/udev/scsi_id' (stdout) 'ID_MODEL=WDC_WD2500KS-00M'
> > run_program: '/lib/udev/scsi_id' (stdout) 'ID_REVISION=02.0'
> > run_program: '/lib/udev/scsi_id' (stdout) 'ID_SERIAL=SATA_WDC_WD2500KS-00_WD-WCANK6187088'
> > run_program: '/lib/udev/scsi_id' (stdout) 'ID_SERIAL_SHORT=WD-WCANK6187088'
> > run_program: '/lib/udev/scsi_id' (stdout) 'ID_TYPE=disk'
> > run_program: '/lib/udev/scsi_id' (stdout) 'ID_BUS=scsi'
> > run_program: '/lib/udev/scsi_id' returned with status 0
> > udev_rules_get_name: add symlink 'disk/by-id/scsi-SATA_WDC_WD2500KS-00_WD-WCANK6187088'
> > run_program: '/lib/udev/path_id /block/sdc'
> > run_program: '/lib/udev/path_id' (stdout) 'ID_PATH=pci-0000:05:05.0-scsi-0:0:0:0'
> > run_program: '/lib/udev/path_id' returned with status 0
> > udev_rules_get_name: add symlink 'disk/by-path/pci-0000:05:05.0-scsi-0:0:0:0'
> > run_program: '/lib/udev/vol_id --export /dev/.tmp-8-32'
> > run_program: '/lib/udev/vol_id' (stdout) 'ID_FS_USAGE=raid'
> > run_program: '/lib/udev/vol_id' (stdout) 'ID_FS_TYPE=linux_raid_member'
> > run_program: '/lib/udev/vol_id' (stdout) 'ID_FS_VERSION=0.90.0'
> > run_program: '/lib/udev/vol_id' (stdout) 'ID_FS_UUID=2d773baf-8174-10a6-14db-a78e0e676e89'
> > run_program: '/lib/udev/vol_id' (stdout) 'ID_FS_LABEL='
> > run_program: '/lib/udev/vol_id' (stdout) 'ID_FS_LABEL_SAFE='
> > run_program: '/lib/udev/vol_id' returned with status 0
> > udev_rules_get_name: add symlink 'disk/by-uuid/2d773baf-8174-10a6-14db-a78e0e676e89'
> > run_program: '/lib/udev/edd_id --export /dev/.tmp-8-32'
> > run_program: '/lib/udev/edd_id' (stderr) 'no kernel EDD support'
> > run_program: '/lib/udev/edd_id' returned with status 2
> > udev_rules_get_name: no node name set, will use kernel name 'sdc'
> > udev_device_event: device '/block/sdc' already in database, validate currently present symlinks
> > udev_node_add: creating device node '/dev/sdc', major = '8', minor = '32', mode = '0640', uid = '0', gid = '6'
> > udev_node_add: creating symlink '/dev/disk/by-id/scsi-SATA_WDC_WD2500KS-00_WD-WCANK6187088' to '../../sdc'
> > udev_node_add: creating symlink '/dev/disk/by-path/pci-0000:05:05.0-scsi-0:0:0:0' to '../../sdc'
> > udev_node_add: creating symlink '/dev/disk/by-uuid/2d773baf-8174-10a6-14db-a78e0e676e89' to '../../sdc'
> > main: run: '/sbin/multipath -v0 8:32'
> > main: run: 'socket:/org/kernel/udev/monitor'
> > main: run: 'socket:/org/freedesktop/hal/udev_event'
> > main: run: '/sbin/pam_console_apply /dev/sdc /dev/disk/by-id/scsi-SATA_WDC_WD2500KS-00_WD-WCANK6187088 /dev/disk/by-path/pci-0000:05:05.0-scsi-0:0:0:0 /dev/disk/by-uuid/2d773baf-8174-10a6-14db-a78e0e676e89'
> >
> >
> >
> > running udevtest on sdd gets me ..
> >
> > parse_file: reading '/etc/udev/rules.d/05-udev-early.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/40-multipath.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/50-udev.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/60-libsane.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/60-net.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/60-pcmcia.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/60-wacom.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/85-pcscd_ccid.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/85-pcscd_egate.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/90-alsa.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/90-hal.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/95-pam-console.rules' as rules file
> > parse_file: reading '/etc/udev/rules.d/bluetooth.rules' as rules file
> > This program is for debugging only, it does not create any node,
> > or run any program specified by a RUN key. It may show incorrect results,
> > if rules match against subsystem specfic kernel event variables.
> >
> > main: looking at device '/block/sdd' from subsystem 'block'
> > run_program: '/bin/bash -c '/sbin/lsmod | /bin/grep ^dm_multipath''
> > run_program: '/bin/bash' (stdout) 'dm_multipath           28889  0 '
> > run_program: '/bin/bash' returned with status 0
> > run_program: '/lib/udev/usb_id -x'
> > run_program: '/lib/udev/usb_id' returned with status 1
> > run_program: '/lib/udev/scsi_id -g -x -s /block/sdd -d /dev/.tmp-8-48'
> > run_program: '/lib/udev/scsi_id' (stdout) 'ID_VENDOR=ATA'
> > run_program: '/lib/udev/scsi_id' (stdout) 'ID_MODEL=WDC_WD2500KS-00M'
> > run_program: '/lib/udev/scsi_id' (stdout) 'ID_REVISION=02.0'
> > run_program: '/lib/udev/scsi_id' (stdout) 'ID_SERIAL=SATA_WDC_WD2500KS-00_WD-WCANK6240588'
> > run_program: '/lib/udev/scsi_id' (stdout) 'ID_SERIAL_SHORT=WD-WCANK6240588'
> > run_program: '/lib/udev/scsi_id' (stdout) 'ID_TYPE=disk'
> > run_program: '/lib/udev/scsi_id' (stdout) 'ID_BUS=scsi'
> > run_program: '/lib/udev/scsi_id' returned with status 0
> > udev_rules_get_name: add symlink 'disk/by-id/scsi-SATA_WDC_WD2500KS-00_WD-WCANK6240588'
> > run_program: '/lib/udev/path_id /block/sdd'
> > run_program: '/lib/udev/path_id' (stdout) 'ID_PATH=pci-0000:05:05.0-scsi-1:0:0:0'
> > run_program: '/lib/udev/path_id' returned with status 0
> > udev_rules_get_name: add symlink 'disk/by-path/pci-0000:05:05.0-scsi-1:0:0:0'
> > run_program: '/lib/udev/vol_id --export /dev/.tmp-8-48'
> > run_program: '/lib/udev/vol_id' (stdout) 'ID_FS_USAGE=raid'
> > run_program: '/lib/udev/vol_id' (stdout) 'ID_FS_TYPE=linux_raid_member'
> > run_program: '/lib/udev/vol_id' (stdout) 'ID_FS_VERSION=0.90.0'
> > run_program: '/lib/udev/vol_id' (stdout) 'ID_FS_UUID=2d773baf-8174-10a6-14db-a78e0e676e89'
> > run_program: '/lib/udev/vol_id' (stdout) 'ID_FS_LABEL='
> > run_program: '/lib/udev/vol_id' (stdout) 'ID_FS_LABEL_SAFE='
> > run_program: '/lib/udev/vol_id' returned with status 0
> > udev_rules_get_name: add symlink 'disk/by-uuid/2d773baf-8174-10a6-14db-a78e0e676e89'
> > run_program: '/lib/udev/edd_id --export /dev/.tmp-8-48'
> > run_program: '/lib/udev/edd_id' (stderr) 'no kernel EDD support'
> > run_program: '/lib/udev/edd_id' returned with status 2
> > udev_rules_get_name: no node name set, will use kernel name 'sdd'
> > udev_device_event: device '/block/sdd' already in database, validate currently present symlinks
> > udev_node_add: creating device node '/dev/sdd', major = '8', minor = '48', mode = '0640', uid = '0', gid = '6'
> > udev_node_add: creating symlink '/dev/disk/by-id/scsi-SATA_WDC_WD2500KS-00_WD-WCANK6240588' to '../../sdd'
> > udev_node_add: creating symlink '/dev/disk/by-path/pci-0000:05:05.0-scsi-1:0:0:0' to '../../sdd'
> > udev_node_add: creating symlink '/dev/disk/by-uuid/2d773baf-8174-10a6-14db-a78e0e676e89' to '../../sdd'
> > main: run: '/sbin/multipath -v0 8:48'
> > main: run: 'socket:/org/kernel/udev/monitor'
> > main: run: 'socket:/org/freedesktop/hal/udev_event'
> > main: run: '/sbin/pam_console_apply /dev/sdd /dev/disk/by-id/scsi-SATA_WDC_WD2500KS-00_WD-WCANK6240588 /dev/disk/by-path/pci-0000:05:05.0-scsi-1:0:0:0 /dev/disk/by-uuid/2d773baf-8174-10a6-14db-a78e0e676e89'
> >
> >
> > note, same uuid. wtf?
>
> The devices are competing about the same symlink, because they contain
> the same metadata. But all of them are USAGE="raid" which should not
> create any uuid-links at all.
>
> Let's look at your rules, what does:
>    grep by-uuid /etc/udev/rules.d/*.rules
> print?

Oh, looking at the current Fedora udev rules, they are just not
correct. You are rolling your own version of the persistent link rules
which don't do what they should. I strongly suggest to use the default
rules instead of rolling your own incomplete copy of it.

The warning is harmless, you can just ignore it, it's a failing link
creation for a raid-set-metadata uuid, not a filesystem uuid. These
links would be just skipped with normal udev rules.

Thanks,
Kay
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