FC3 Only allows ONE USB storage device. Adding another freezes module

["C. Andrews La Varre" <alavarre@ids.net>]

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Thank you again for the invitation to contribute. Below is a
sequence of tests I've conducted with the usb-storage module in
RedHat Fedora Core 3.

This problem did not exist with RedHat
Enterprise Linux 3.0.

The synopsis is that you can load one and only
one USB storage device.

Simply  inserting a second device, whether
or not the first device has been actually mounted, will freeze the
module. It is so frozen that it will not even respond to kill using
the SIGKILL signal explicitly.

This is being run on a Dell M60 Precision x686 machine, with Intel
Pentium M processor at 1.80 GHz.

Please let me know what I can do to help solve this problem.

Best regards, Andy
#
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1. From a clean reboot, with all of the actions below done in a root
terminal session:
	modprobe -r usb-storage
works just fine.

2. After which,
	modprobe usb-storage
results in messages stating:
	Apr 18 18:32:28 m60 kernel: SCSI subsystem initialized
	Apr 18 18:32:28 m60 kernel: Initializing USB Mass Storage driver...
	Apr 18 18:32:28 m60 kernel: usbcore: registered new driver usb-storage
	Apr 18 18:32:28 m60 kernel: USB Mass Storage support registered.
	
So far, all so good.

3. I then plug in the USBstick. It is formatted vfat. There is a
brief flurry of disk action and messages reports
	Apr 18 18:33:20 m60 ntpd[4380]: kernel time sync enabled 0001
	Apr 18 18:34:07 m60 kernel: usb 1-3: new high speed USB device
using address 3
	Apr 18 18:34:07 m60 kernel: scsi0 : SCSI emulation for USB Mass
Storage devices
	Apr 18 18:34:07 m60 kernel:   Vendor: Generic   Model: STORAGE
DEVICE    Rev: 1033
	Apr 18 18:34:07 m60 kernel:   Type:   Direct-Access
      ANSI SCSI revision: 02
	Apr 18 18:34:07 m60 scsi.agent[9492]: disk at
/devices/pci0000:00/0000:00:1d.7/usb1/1-3/1-3:1.0/host0/0:0:0:0
	Apr 18 18:34:08 m60 kernel: SCSI device sda: 512000 512-byte hdwr
sectors (262 MB)
	Apr 18 18:34:08 m60 kernel: sda: Write Protect is off
	Apr 18 18:34:08 m60 kernel: sda: assuming drive cache: write through
	Apr 18 18:34:08 m60 kernel:  sda: unknown partition table
	Apr 18 18:34:08 m60 kernel: Attached scsi removable disk sda at
scsi0, channel 0, id 0, lun 0
	Apr 18 18:34:09 m60 fstab-sync[9593]: added mount point
/media/usbdisk for /dev/sda

Again, all good. Doing fdisk shows the partition as sda1

Now, I know that if I mount it at this point it will mount correctly.

4. But before doing that I want to see what happens when I plug in
the second one:

Again, a very brief flurry of disk activity, apparently less that
with the USB stick:

Now messages reports:
	Apr 18 18:37:10 m60 kernel: usb 1-4: new high speed USB device
using address 4
	Apr 18 18:37:10 m60 kernel: scsi1 : SCSI emulation for USB Mass
Storage devices
	Apr 18 18:37:10 m60 kernel:   Vendor: Generic   Model: STORAGE
DEVICE    Rev: 9139
	Apr 18 18:37:10 m60 kernel:   Type:   Direct-Access
      ANSI SCSI revision: 02
	Apr 18 18:37:10 m60 kernel: SCSI device sdb: 64000 512-byte hdwr
sectors (33 MB)

so it is being correctly recognized.

Note, however that the scsi.agent line does not occur.

Furthermore the following timeouts occur:
	Apr 18 18:37:15 m60 kernel: usb 1-4: control timeout on ep0in
	Apr 18 18:37:15 m60 wait_for_sysfs[9599]: either wait_for_sysfs
(udev 039) needs an update to handle the device
'/devices/pci0000:00/0000:00:1d.7/usb1/1-4/1-4:1.0' properly (no bus
device link) or the sysfs-support of your device's driver needs to
be fixed, please report to <linux-hotplug-devel@lists.sourceforge.net>
	Apr 18 18:37:15 m60 wait_for_sysfs[9615]: either wait_for_sysfs
(udev 039) needs an update to handle the device
'/devices/pci0000:00/0000:00:1d.7/usb1/1-4/1-4:1.0/host1/1:0:0:0'
properly (no bus device link) or the sysfs-support of your device's
driver needs to be fixed, please report to
<linux-hotplug-devel@lists.sourceforge.net>
	Apr 18 18:37:25 m60 hal.hotplug[9623]: timout(10000 ms) waiting for
/devices/pci0000:00/0000:00:1d.7/usb1/1-4/1-4:1.0
	Apr 18 18:37:25 m60 hal.hotplug[9628]: timout(10000 ms) waiting for
/devices/pci0000:00/0000:00:1d.7/usb1/1-4/1-4:1.0/host1/1:0:0:0

25 seconds after being plugged in it gives up, reporting:	
	Apr 18 18:37:36 m60 scsi.agent[9644]: Attribute
/sys/devices/pci0000:00/0000:00:1d.7/usb1/1-4/1-4:1.0/host1/1:0:0:0/type
does not exist
	
Not that this failure is independent of any actual mountings, since
I have not yet mounted anything.

6. So let's pull the plug. First pull the one that failed. Messages
does not record anything.

7. Now pull the plug on the first one, which was correctly
registered. Again, nothing in messages.

8. Now let's plug in the one that failed before: Nothing reported in
messages.

So the system is locked up with the first recognized device.

9. OK, now let's try to unload the module:
	modprobe -r usb-storage

The terminal session freezes. Ctrl-C does not break the session.
Messages reports:
	Apr 18 18:45:35 m60 kernel: usbcore: deregistering driver usb-storage
but the terminal is still frozen. I'll leave it for a while to see
if it times out.

9a. Nope, two minutes later, still no action. I close the terminal
and start a new session.

Now I can try modprobe -r usb-storage, which fails, but at least I
can Ctrl-C to end the process.

9b. Plugging in again either unit has no response. The usb-storage
module is obviously frozen.

9c.
	ps -A
shows four relevant processes:
 9481 ?        00:00:00 scsi_eh_0
 9483 ?        00:00:00 usb-storage
 9610 ?        00:00:00 scsi_eh_1
 9611 ?        00:00:00 usb-storage

I try to kill modprobe:
	kill 9686
	kill -SIGKILL 9686
	kill -SIGTERM 9686
	kill -s SIGKILL 9686
	kill -s SIGTERM 9686
	killall modprobe
	
None of these works. I try the same with the other three processes.
No luck. They are frozen solid.

The only way to unfreeze it is to reboot AFAICT.

10.  As a final test, I plug in the unit that registered correctly
and try to mount it:

	[root@m60 ~]# mount -t vfat -o exec -o rw -o suid -o user -o
uid=andy -o gid=andy -o umask\000 -o dmask\000 /dev/sda1
/mnt/removable
mount: special device /dev/sda1 does not exist

Nope, sorry, it's gone.

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