From: Russell Senior <seniorr@aracnet.com>
To: linux-hotplug@vger.kernel.org
Subject: Re: (on Knoppix 5.0DVD) plugging second usb-storage device removes the first one!
Date: Mon, 03 Apr 2006 11:31:18 +0000 [thread overview]
Message-ID: <86y7ymzyih.fsf@coulee.tdb.com> (raw)
In-Reply-To: <86d5fzl5uf.fsf@coulee.tdb.com>
>>>>> "Russell" = Russell Senior <seniorr@aracnet.com> writes:
Russell> I am having a problem with hotplugging two usb storage
Russell> devices. This is using the new Knoppix 5.0DVD recently
Russell> released. I'd like to fix or, barring that, workaround it.
Russell> Here's the outline of what happens:
Russell> a) i plug a usb-storage device;
Russell> b) a desktop icon for the device appears, i get a dialog
Russell> box asking me what I want to do with the device (open or "do
Russell> nothing"), I say do nothing;
Russell> c) from a shell, i manually mount the device: # mount
Russell> /dev/sda1 /media/sda1
Russell> d) /proc/mounts shows /dev/sda1 mounted
Russell> e) i plug a second usb-storage device;
Russell> f) the desktop icon for the first device disappears for a
Russell> few moments, then it reappears with a second desktop icon for
Russell> the second usb-storage device. I get two more dialog boxes
Russell> asking me what I want to do with the devices. I look in
Russell> /proc/mounts and my /dev/sda1 mount is gone. Ouch.
Russell> I've attached an strace to udevd during this procedure, you
Russell> can find it at:
Russell> <http://www.personaltelco.net/~russell/strace-udevd.log>
[...]
I've learned a little more about this. I have discovered that more or
less the same thing occurs on Debian/unstable (with a vanilla kernel).
I've just retested on a 2.6.16.1 kernel. I also found udevmonitor.
Here's what I see from that when I plug the two devices on the
Debian/unstable box with 2.6.16.1:
# udevmonitor
udevmonitor prints the received event from the kernel [UEVENT]
and the event which udev sends out after rule processing [UDEV]
UEVENT[1144060933.782273] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1
UEVENT[1144060933.782382] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1/4-3.1.1:1.0
UEVENT[1144060933.782405] add@/class/scsi_host/host7
UEVENT[1144060933.782424] add@/class/usb_device/usbdev4.14
UDEV [1144060933.784163] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1
UDEV [1144060933.822599] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1/4-3.1.1:1.0
UDEV [1144060933.878505] add@/class/scsi_host/host7
UDEV [1144060933.892363] add@/class/usb_device/usbdev4.14
UEVENT[1144060938.800149] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1/4-3.1.1:1.0/host7/target7:0:0/7:0:0:0
UEVENT[1144060938.802896] add@/block/sda
UEVENT[1144060938.807103] add@/block/sda/sda1
UEVENT[1144060938.807154] add@/class/scsi_device/7:0:0:0
UDEV [1144060938.823077] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1/4-3.1.1:1.0/host7/target7:0:0/7:0:0:0
UDEV [1144060938.838759] add@/class/scsi_device/7:0:0:0
UDEV [1144060938.881802] add@/block/sda
UDEV [1144060938.939771] add@/block/sda/sda1
UEVENT[1144060953.195921] remove@/class/scsi_device/7:0:0:0
UEVENT[1144060953.196013] remove@/block/sda/sda1
UEVENT[1144060953.196035] remove@/block/sda
UEVENT[1144060953.196057] remove@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1/4-3.1.1:1.0/host7/target7:0:0/7:0:0:0
UEVENT[1144060953.196080] remove@/class/scsi_host/host7
UEVENT[1144060953.196101] remove@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1/4-3.1.1:1.0
UEVENT[1144060953.196123] remove@/class/usb_device/usbdev4.14
UEVENT[1144060953.196148] remove@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1
UDEV [1144060953.198097] remove@/class/scsi_device/7:0:0:0
UDEV [1144060953.199573] remove@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1/4-3.1.1:1.0/host7/target7:0:0/7:0:0:0
UDEV [1144060953.204013] remove@/class/scsi_host/host7
UDEV [1144060953.209152] remove@/block/sda/sda1
UDEV [1144060953.212780] remove@/class/usb_device/usbdev4.14
UDEV [1144060953.221786] remove@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1/4-3.1.1:1.0
UDEV [1144060953.229281] remove@/block/sda
UDEV [1144060953.242272] remove@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1
UEVENT[1144060953.522434] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1
UEVENT[1144060953.523274] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1/4-3.1.1:1.0
UEVENT[1144060953.523335] add@/class/scsi_host/host8
UEVENT[1144060953.523358] add@/class/usb_device/usbdev4.15
UDEV [1144060953.525767] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1
UDEV [1144060953.565114] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1/4-3.1.1:1.0
UDEV [1144060953.621186] add@/class/scsi_host/host8
UDEV [1144060953.634874] add@/class/usb_device/usbdev4.15
UEVENT[1144060953.818125] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.3
UEVENT[1144060953.820214] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.3/4-3.1.3:1.0
UEVENT[1144060953.820290] add@/class/scsi_host/host9
UEVENT[1144060953.820312] add@/class/usb_device/usbdev4.16
UDEV [1144060953.820724] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.3
UDEV [1144060953.858802] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.3/4-3.1.3:1.0
UDEV [1144060953.914400] add@/class/scsi_host/host9
UDEV [1144060953.928954] add@/class/usb_device/usbdev4.16
UEVENT[1144060958.537592] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1/4-3.1.1:1.0/host8/target8:0:0/8:0:0:0
UEVENT[1144060958.540764] add@/block/sda
UEVENT[1144060958.545060] add@/block/sda/sda1
UEVENT[1144060958.545120] add@/class/scsi_device/8:0:0:0
UDEV [1144060958.561068] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.1/4-3.1.1:1.0/host8/target8:0:0/8:0:0:0
UDEV [1144060958.577157] add@/class/scsi_device/8:0:0:0
UDEV [1144060958.619965] add@/block/sda
UDEV [1144060958.676679] add@/block/sda/sda1
UEVENT[1144060959.340269] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.3/4-3.1.3:1.0/host9/target9:0:0/9:0:0:0
UEVENT[1144060959.342911] add@/block/sdb
UEVENT[1144060959.347502] add@/block/sdb/sdb1
UEVENT[1144060959.347557] add@/class/scsi_device/9:0:0:0
UDEV [1144060959.365249] add@/devices/pci0000:00/0000:00:0b.0/0000:02:08.2/usb4/4-3/4-3.1/4-3.1.3/4-3.1.3:1.0/host9/target9:0:0/9:0:0:0
UDEV [1144060959.377210] add@/class/scsi_device/9:0:0:0
UDEV [1144060959.423595] add@/block/sdb
UDEV [1144060959.465071] add@/block/sdb/sdb1
I don't understand why does /block/sda1 get removed on a plug of a
different usb-storage? What is the solution for this to behave sanely?
Thanks!
--
Russell Senior ``I have nine fingers; you have ten.''
seniorr@aracnet.com
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next prev parent reply other threads:[~2006-04-03 11:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-03 3:02 (on Knoppix 5.0DVD) plugging second usb-storage device removes the first one! Russell Senior
2006-04-03 11:31 ` Russell Senior [this message]
2006-04-03 11:39 ` Duncan Sands
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