Included is a patch against the latest Hotplug to fix coldplugging of scanners. This works around a kernel/hotplug interaction bug that's more social (read: noone wants to discuss how to fix it properly) than technical. Reproducible: Always Steps to Reproduce:
Created attachment 52425 [details, diff] USB Hotplug patch
Assigned to hotplug/coldplug maintainer.
This patch works here, shutting up coldplug-usb sane script complaints that it can't chown or chmod the /proc/bus/usb device file because it doesn't exist. I also verified that it now changes the permissions on the correct file. (I'm just now trying to get it working, and it still doesn't work, with sane-find-scanner -vv saying libusb isn't available, so I can't verify that it works all the way just yet, but that's a different problem. This patch seems to fix the nasty boot messages and now it correctly permissions the /proc device file, so I'm closer than I was.)
Gentoo installs a "scanner" group you need to be in. Since I'm the only one on my box, I just edited the file to chmod it 666.
This patch works. But is it addressing the real source of the problem? As far as I can tell: /sbin/hotplug calls /etc/hotplug.d/default/default.hotplug which then calls /etc/hotplug/usb.agent It looks like usb.agent is getting called for the USB hub with a sysfs directory that has the info for the scanner. It is then called with an incorrect DEVICE arg for the scanner sysfs entry. Hardware: Epson scanner --> USB 2.0 HUB --> Motherboard port (AMD 64) # cat /proc/version Linux version 2.6.11-gentoo-r8 (root@localhost) (gcc version 3.4.3 20041125 (Gentoo 3.4.3-r1, ssp-3.4.3-0, pie-8.7.7)) #2 Sat May 14 12:38:26 MDT 2005 # emerge --pretend --verbose udev hotplug sane-backends libusb [ebuild R ] sys-fs/udev-056 (-selinux) +static 0 kB [ebuild R ] sys-apps/hotplug-20040923 0 kB [ebuild R ] media-gfx/sane-backends-1.0.15 -gphoto2 +ipv6 +usb 0 kB [ebuild R ] dev-libs/libusb-0.1.8 -debug -doc 0 kB # lsusb (partial output) Bus 001 Device 005: ID 04b8:011e Seiko Epson Corp. Perfection 1660 Photo Bus 001 Device 003: ID 050d:0224 Belkin Components F5U224 USB 2.0 4-Port Hub # cat /sys/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2.4/id* 011e 04b8 # cat /sys/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2.4/../../devnum 1 # cat /sys/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2.4/../devnum 3 # ls -l '/sys/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2.4/1-2.4:1.0' total 0 -r--r--r-- 1 root root 4096 May 17 13:02 bAlternateSetting -r--r--r-- 1 root root 4096 May 17 12:42 bInterfaceClass -r--r--r-- 1 root root 4096 May 17 13:02 bInterfaceNumber -r--r--r-- 1 root root 4096 May 17 12:42 bInterfaceProtocol -r--r--r-- 1 root root 4096 May 17 12:42 bInterfaceSubClass -r--r--r-- 1 root root 4096 May 17 12:42 bNumEndpoints -rw-r--r-- 1 root root 4096 May 18 12:18 detach_state drwxr-xr-x 2 root root 0 May 17 12:42 power # cat '/sys/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2.4/1-2.4:1.0/../../devnum' 3 # cat '/sys/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2.4/1-2.4:1.0/../devnum' 5 coldplug trace: ===================================================== usb.agent: start PRODUCT=050d/0224/0100 DEVICE=/proc/bus/usb/001/003 DEVPATH=/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2.4 ===================================================== usb.agent: ACTION=add DEVICE=/proc/bus/usb/001/003 DEVPATH=/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2.4 DRIVERS= usb.agent: LABEL=USB EPSON EPSON Scanner usb.agent: MAP_CURRENT=/lib/modules/2.6.11-gentoo-r8/modules.usbmap usb.agent: ------------------------------------ usb.agent: MAP=/etc/hotplug/usb.usermap DEVICE=/proc/bus/usb/001/003 DEVPATH=/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2.4 LABEL=USB EPSON EPSON Scanner usb.agent: ------------------------------------ usb.agent: MAP=/etc/hotplug/usb/libsane.usermap DEVICE=/proc/bus/usb/001/003 DEVPATH=/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2.4 LABEL=USB EPSON EPSON Scanner usb.agent: ------------------------------------ usb.agent: MAP=/etc/hotplug/usb/tascam_fw.usermap DEVICE=/proc/bus/usb/001/003 DEVPATH=/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2.4 LABEL=USB EPSON EPSON Scanner ... no modules for USB EPSON EPSON Scanner ===================================================== usb.agent: start PRODUCT=04b8/011e/0100 DEVICE=/proc/bus/usb/003/005 DEVPATH=/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2.4/1-2.4:1.0 ===================================================== usb.agent: ACTION=add DEVICE=/proc/bus/usb/003/005 DEVPATH=/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2.4/1-2.4:1.0 DRIVERS= usb.agent: LABEL=USB product 04b8/011e/0100 usb.agent: MAP_CURRENT=/lib/modules/2.6.11-gentoo-r8/modules.usbmap usb.agent: ------------------------------------ usb.agent: MAP=/etc/hotplug/usb.usermap DEVICE=/proc/bus/usb/003/005 DEVPATH=/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2.4/1-2.4:1.0 LABEL=USB product 04b8/011e/0100 usb.agent: ------------------------------------ usb.agent: MAP=/etc/hotplug/usb/libsane.usermap DEVICE=/proc/bus/usb/003/005 DEVPATH=/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2.4/1-2.4:1.0 LABEL=USB product 04b8/011e/0100 Setup libusbscanner for USB product 04b8/011e/0100 load_drivers MODULE=libusbscanner Module setup libusbscanner for USB product 04b8/011e/0100 libusbscanner: /etc/hotplug/usb/libusbscanner: started libusbscanner: ACTION=add DEVICE=/proc/bus/usb/003/005 libusbscanner: /etc/hotplug/usb/libusbscanner: set permissions libusbscanner: TYPE=usb ACTION=add DEVICE=/proc/bus/usb/003/005 chown: cannot access `/proc/bus/usb/003/005': No such file or directory chmod: cannot access `/proc/bus/usb/003/005': No such file or directory libusbscanner: chown/chmod finished for /proc/bus/usb/003/005 usb.agent: load_drivers for /etc/hotplug/usb/libsane.usermap: DRIVERS=libusbscanner usb.agent: ------------------------------------ usb.agent: MAP=/etc/hotplug/usb/tascam_fw.usermap DEVICE=/proc/bus/usb/003/005 DEVPATH=/devices/pci0000:00/0000:00:10.4/usb1/1-2/1-2.4/1-2.4:1.0 LABEL=USB product 04b8/011e/0100
That's what this patch is for.
Any idea when will this find its way into Portage? -- Regards, Mick
I've sent it up to the Hotplug list, but noone's touched it nor commented on it yet. Greg (the mainainer) also hasn't put it in yet. I'm still waiting word on it.
Hi, I still get my error. Please, see if you can find out why I am unable to solve this issue. Content of my file: #!/bin/sh # vim: syntax=sh # # usb.rc This brings the USB subsystem up and down safely. # # $Id: usb.rc,v 1.28 2004/09/20 22:30:35 kroah Exp $ # # Best invoked via /etc/init.d/hotplug or equivalent, with # writable /tmp, /usr mounted, and syslogging active. # # Bus management is basically unrelated to runlevel changes; it # relates to physical topology, including possibly hotpluggable # busses (USB, Cardbus) or controllers. If a bus is physically # present, it should normally be available. # # USB-dependant systems (iMacs, "legacy free" x86 systems, and so on) # should statically link USB keyboard support into the kernel (USB core, # EHCI/OHCI/UHCI/..., hid, input, keybdev; and likely mousedev) so the # system console can't be removed by accident. PATH=/sbin:/bin:/usr/sbin:/usr/bin unset I_WANT_A_BROKEN_PS PS_PERSONALITY=linux STATIC_MODULE_LIST= X11_USBMICE_HACK=false # override any of the defaults above? if [ -f /etc/sysconfig/usb ]; then . /etc/sysconfig/usb fi if [ -f /etc/conf.d/usb ]; then . /etc/conf.d/usb fi MOUSE_MODULES="mousedev input" # In its currently-recommended configuration, XFree86 3.3.6 always opens # /dev/input/mice; so mousedev and input must be loaded before X11 starts. if [ $X11_USBMICE_HACK = true ]; then STATIC_MODULE_LIST="$MOUSE_MODULES $STATIC_MODULE_LIST" fi # # "COLD PLUG" ... recovery from partial USB init that may have happened # before the OS could really handle hotplug, perhaps because /sbin or # $HOTPLUG_DIR wasn't available or /tmp wasn't writable. When/if the # /sbin/hotplug program is invoked then, hotplug event notifications # get dropped. To make up for such "cold boot" errors, we synthesize # all the hotplug events we expect to have seen already. They can be # out of order, and some might be duplicates. # # Note that on 2.5 the init filesystem may have loaded some of the more # essential usb drivers (maybe usb-storage for a boot disk, and hid), # but we may still need to load less important ones or invoke setup # scripts that couldn't run earlier. # usb_boot_events () { # # FIXME on 2.5, /sys/bus/usb/devices/* gives all of the # info we need. Interface hotplug events come from the # "*:*" files, and device events (do them first) come # from the others. # # don't expect usbmodules to exist!! and remove the # dependency (below) on usbfs to decide whether we should # be synthesizing coldplug events. # # synthesize hotplug events if we can # make sure the usb agent will run ACTION=add PRODUCT=0/0/0 TYPE= INTERFACE= DEVPATH= DEVFS=/proc/bus/usb DEVICE= export ACTION PRODUCT TYPE INTERFACE DEVPATH DEVFS DEVICE if [ -d /sys/bus ]; then if [ -d /sys/bus/usb/devices ]; then cd /sys/bus/usb/devices for device in /sys/bus/usb/devices/[0-9]*; do devlink=$( readlink -f $device ) DEVPATH=${devlink#/sys} if [ -f $devlink/../idVendor ]; then PRODUCT="$(cat $devlink/../idVendor)/$(cat $devlink/../idProduct)/$(cat $devlink/../bcdDevice)" if [ -f $devlink/../../devnum ] then devbus=$( ( echo -n 000`echo $devlink| sed 's/^.*usb\([0-9]\+\)\/.*$/\1/'` ) | grep -o ...\$ ) devdev=$( ( echo -n 000 ; cat $devlink/../devnum ) | grep -o ...\$ ) DEVICE="/proc/bus/usb/$devbus/$devdev" else DEVICE= fi /etc/hotplug/usb.agent fi done fi else # we need (non-bash) programs to parse descriptors. LISTER=`which usbmodules` if [ "$LISTER" = "" ] || [ ! -f /proc/bus/usb/devices ]; then echo $"** can't synthesize root hub events" return fi for DEVICE in /proc/bus/usb/*/*; do /etc/hotplug/usb.agent done fi } maybe_start_usb () { COUNT=0 # if USB is partially initted then synthesize "cold plug" events. the # kernel probably dropped many "hot plug" events, and those it didn't # drop likely couldn't trigger all the setup actions (kicking daemons, # dropping config records, and so on). # if it's not initted at all (no hcds loaded) no synthesized events # will be needed, we'll see real ones. knowing that there are no # hcds available through version-portable logic is a nightmare, so # assume we synthesize unless "usbfs" is clearly not initted (which # we currently need when synthesizing, anyway). SYNTHESIZE=true if [ ! -d /proc/bus/usb ]; then SYNTHESIZE=false fi # if distro hasn't already done part of this ... load core, # and mount usbfs before the first hotplug agent fires # (so it'll be available to the agents). modprobe -q usbcore >/dev/null 2>&1 if [ -d /proc/bus/usb ]; then # if it's not mounted, try to mount it if [ -z "`grep " /proc/bus/usb " /proc/mounts`" ]; then if grep -q -E "^[^#][^[:space:]]+[[:space:]]+/proc/bus/usb/?[[:space:]]" /etc/fstab; then mount /proc/bus/usb else if grep -q usbfs /proc/filesystems; then mount -t usbfs usbfs /proc/bus/usb else mount -t usbdevfs usbdevfs /proc/bus/usb fi fi fi fi # Load Host Controller Drivers (HCDs) ... this automatically handles # systems with multiple controllers (EHCI, OHCI, UHCI) without needing # /proc or tools (lspci -v|grep USB, etc) to do so. If hotplugging # is enabled on this system, initting a root hub will cause hotplug # events to fire for every device on the tree at that root. # FIXME: some of this should be driven by PCI hotplugging, and have # the blacklist control which uhci driver gets used (before 2.5). # "new style" HCDs ... more common code modprobe -q ehci-hcd >/dev/null 2>&1 modprobe -q ohci-hcd >/dev/null 2>&1 modprobe -q uhci-hcd >/dev/null 2>&1 # "old style" HCDs ... more driver-specific bugs modprobe -q usb-ohci >/dev/null 2>&1 # NOTE: this prefers "uhci"; you may prefer "usb-uhci". # modprobe -q usb-uhci >/dev/null 2>&1 || modprobe -q uhci >/dev/null 2>&1 modprobe -q uhci >/dev/null 2>&1 || modprobe -q usb-uhci >/dev/null 2>&1 # ... add any non-PCI HCDS here. Examples include the # CRIS usb-host, Philips ISP-1161, Symlogic 811HS, and so on. # ohci-hcd can handle some non-pci variants. if [ -d /proc/bus/usb ]; then # If we see there are no busses, we "failed" and # can report so even if we're partially nonmodular. # # NOTE: this fails on older kernels, where usbdevfs had two files # ('devices' and 'drivers') with no hcds registered, but works on # newer kernels where usbfs has zero files until hcds register, # and might not have the 'drivers' file. COUNT=`ls /proc/bus/usb | wc -l` if [ $COUNT -lt 2 ]; then umount /proc/bus/usb rmmod usbcore >/dev/null 2>&1 return 1 fi # if USB is fully modular and yet can clean up, # we know init failed without needing usbfs elif rmmod usbcore >/dev/null 2>&1; then return 1 fi # hotplug events didn't fire during booting; # cope with devices that enumerated earlier # and may not have been fully configured. if [ $SYNTHESIZE = true ]; then sleep 1 usb_boot_events fi # Some modules are statically loaded, perhaps because they are # needed to activate filesystem device nodes. for MODULE in $STATIC_MODULE_LIST; do modprobe $MODULE done # we did everything we could ... return 0 } maybe_stop_usb () { # call this multiple times if you had to take down components of the # USB subsystem by hand; it cleans up whatever can # be cleaned up, letting the system quiesce further. # NOTE: this list of "all USB modules" is unfortunate, but it seems # inevitable until modutils supports the notion of drivers with use # counts of zero that shouldn't be removed until after their device # gets removed. Maybe in 2.5 ... of necessity, the list is partial. # disconnect all controllers we can, and kernel drivers # HCDs first, so most drivers reduce their use counts. rmmod ehci-hcd >/dev/null 2>&1 rmmod ohci-hcd >/dev/null 2>&1 rmmod uhci-hcd >/dev/null 2>&1 rmmod usb-ohci >/dev/null 2>&1 rmmod usb-uhci >/dev/null 2>&1 rmmod uhci >/dev/null 2>&1 # user mode code may keep usbfs busy for a while yet ... # OK, usbcore won't actually be removed unless there happen to be # no USB drivers loaded, and usbfs isn't mounted. let's force # removal of autocleanable modules before trying to rmmod usbcore rmmod -as # note: module-init-tools 0.8a doesn't handle "-as" flags # Now let's workaround the fact that some USB modules never increase # their module use counts, so that "rmmod -a" won't unload them. # (And we can't use "modprobe --autoclean" anyway.) rmmod acm >/dev/null 2>&1 rmmod audio >/dev/null 2>&1 rmmod auerswald >/dev/null 2>&1 rmmod belkin_sa >/dev/null 2>&1 rmmod bluetooth >/dev/null 2>&1 rmmod catc >/dev/null 2>&1 rmmod CDCEther >/dev/null 2>&1 rmmod cpia_usb >/dev/null 2>&1 rmmod cyberjack >/dev/null 2>&1 rmmod dabusb >/dev/null 2>&1 rmmod dc2xx >/dev/null 2>&1 rmmod digi_acceleport >/dev/null 2>&1 rmmod dsbr100 >/dev/null 2>&1 rmmod emi26 >/dev/null 2>&1 rmmod empeg >/dev/null 2>&1 rmmod ftdi_sio >/dev/null 2>&1 rmmod hci_usb >/dev/null 2>&1 rmmod hid >/dev/null 2>&1 rmmod hpusbscsi >/dev/null 2>&1 rmmod ibmcam >/dev/null 2>&1 rmmod iforce >/dev/null 2>&1 rmmod io_edgeport >/dev/null 2>&1 rmmod ipaq >/dev/null 2>&1 rmmod ir-usb >/dev/null 2>&1 rmmod irda-usb >/dev/null 2>&1 rmmod kaweth >/dev/null 2>&1 rmmod keyspan >/dev/null 2>&1 rmmod keyspan_pda >/dev/null 2>&1 rmmod kl5kusb105 >/dev/null 2>&1 rmmod mct_u232 >/dev/null 2>&1 rmmod mdc800 >/dev/null 2>&1 rmmod microtek >/dev/null 2>&1 rmmod omninet >/dev/null 2>&1 rmmod ov511 >/dev/null 2>&1 rmmod pegasus >/dev/null 2>&1 rmmod pl2303 >/dev/null 2>&1 rmmod printer >/dev/null 2>&1 rmmod pwc pwcx >/dev/null 2>&1 rmmod rio500 >/dev/null 2>&1 rmmod rtl8150 >/dev/null 2>&1 rmmod scanner >/dev/null 2>&1 rmmod se401 >/dev/null 2>&1 rmmod stv680 >/dev/null 2>&1 rmmod usbhid >/dev/null 2>&1 rmmod usbkbd >/dev/null 2>&1 rmmod usbmouse >/dev/null 2>&1 rmmod usbnet >/dev/null 2>&1 rmmod usbtest >/dev/null 2>&1 rmmod usb-storage >/dev/null 2>&1 rmmod uss720 >/dev/null 2>&1 rmmod vicam >/dev/null 2>&1 rmmod visor >/dev/null 2>&1 rmmod wacom >/dev/null 2>&1 rmmod whiteheat >/dev/null 2>&1 if [ "$STATIC_MODULE_LIST" != "" ]; then rmmod $STATIC_MODULE_LIST >/dev/null 2>&1 fi # remove the helper modules that some usb modules need rmmod usbserial >/dev/null 2>&1 rmmod usbvideo >/dev/null 2>&1 # ok, hope that user mode drivers/managers closed their fds. umount /proc/bus/usb >/dev/null 2>&1 rmmod usbcore >/dev/null 2>&1 # we did everything we could ... return 0; } # See how we were called. case "$1" in start) maybe_start_usb ;; stop) maybe_stop_usb ;; status) echo $"USB Status for kernel: " `uname -srm` echo '' if [ -f /proc/bus/usb/devices ]; then # as noted above: this fails on older kernels, # where usbfs created files differently. COUNT=`ls /proc/bus/usb | wc -l` if [ $COUNT -ge 2 ]; then COUNT=`expr $COUNT - 2` echo $"USB up; bus count is $COUNT" grep "^[TPSI]:" /proc/bus/usb/devices else echo $"usbfs partially up; no busses" fi echo '' echo $"USB Drivers Loaded: " if [ -f /proc/bus/usb/drivers ]; then cat /proc/bus/usb/drivers fi if [ -d /sys/bus/usb ]; then ls -1 /sys/bus/usb/drivers fi else echo $"usbfs is unavailable. " if [ -f /proc/modules ] && grep -F -q usbcore /proc/modules; then echo $"USB module is loaded. " else echo $"USB may be statically linked. " fi echo $"If khubd is running, that shows USB is available." fi echo '' if [ -f /proc/sys/kernel/hotplug ]; then echo $"khubd/hotplug thread: " else echo $"khubd thread:" fi ps -l | head -n 1 ps -Al | grep 'khubd' | grep -v grep echo '' lsmod echo '' # /proc/devices too? "usb", "input", and others ... ;; restart) # always invoke by absolute path, else PATH=$PATH: $0 stop && $0 start ;; *) echo $"Usage: $0 {start|stop|status|restart}" exit 1 esac This is whay i get at boot or anytime I restart coldplug: # /etc/init.d/coldplug restart * WARNING: you are stopping a boot service. * Coldplugging input devices ... [ ok ] * Coldplugging isapnp devices ... [ ok ] * Coldplugging pci devices ... [ ok ] * Coldplugging pnp devices ... [ ok ] * Coldplugging usb devices ... expr: non-numeric argument /etc/hotplug/usb/libusbscanner: line 21: printf: /devices/pci0000:00/0000:00:02.1/usb1/1-0:1.0: invalid number chown: cannot access `/proc/bus/usb/000/000': No such file or directory chmod: cannot access `/proc/bus/usb/000/000': No such file or directory expr: non-numeric argument /etc/hotplug/usb/libusbscanner: line 21: printf: /devices/pci0000:00/0000:00:02.1/usb1/1-1: invalid number chown: cannot access `/proc/bus/usb/000/000': No such file or directory chmod: cannot access `/proc/bus/usb/000/000': No such file or directory expr: non-numeric argument /etc/hotplug/usb/libusbscanner: line 21: printf: /devices/pci0000:00/0000:00:02.1/usb1/1-9: invalid number chown: cannot access `/proc/bus/usb/000/000': No such file or directory chmod: cannot access `/proc/bus/usb/000/000': No such file or directory expr: non-numeric argument /etc/hotplug/usb/libusbscanner: line 21: printf: /devices/pci0000:00/0000:00:02.0/usb2/2-0:1.0: invalid number chown: cannot access `/proc/bus/usb/000/000': No such file or directory chmod: cannot access `/proc/bus/usb/000/000': No such file or directory expr: non-numeric argument /etc/hotplug/usb/libusbscanner: line 21: printf: /devices/pci0000:00/0000:00:02.0/usb2/2-3: invalid number chown: cannot access `/proc/bus/usb/000/000': No such file or directory chmod: cannot access `/proc/bus/usb/000/000': No such file or directory expr: non-numeric argument /etc/hotplug/usb/libusbscanner: line 21: printf: /devices/pci0000:00/0000:00:02.0/usb2/2-4: invalid number chown: cannot access `/proc/bus/usb/000/000': No such file or directory chmod: cannot access `/proc/bus/usb/000/000': No such file or directory expr: non-numeric argument /etc/hotplug/usb/libusbscanner: line 21: printf: /devices/pci0000:00/0000:00:02.0/usb2/2-5: invalid number chown: cannot access `/proc/bus/usb/000/000': No such file or directory chmod: cannot access `/proc/bus/usb/000/000': No such file or directory thank you, Spiro
Check your scripts for word wrap.
hotplug-20040923-r1 won't fix this bug...
hotplug-20040923-r2 doesn't fix the problem, too.
I've updated to the latest udev, which kills off coldplug (the problem there) making this bug killed. The kernel developers have udev with a "delay until ready" feature in that latest udev. It needs some tweakage but that's another bug. Closing this bug.
