Created attachment 335274 [details]
sane gdb trace

Fedora 10 x386
Same problem here with a HP5300C. strace brings:
...
gettimeofday({1237708304, 160557}, NULL) = 0
ioctl(24, USBDEVFS_REAPURBNDELAY, 0xbf8af248) = 0
pipe([26, 27])                          = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb7f8d758) = 6502
close(27)                               = 0
munmap(0xb78ef000, 659456)              = 0
munmap(0xb7990000, 1314816)             = 0
mmap2(NULL, 5931008, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb59e1000
mmap2(NULL, 2965504, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb570d000
fcntl64(26, F_SETFL, O_RDONLY|O_NONBLOCK) = 0
fstat64(26, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
fcntl64(26, F_GETFL)                    = 0x800 (flags O_RDONLY|O_NONBLOCK)
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++

I have what seems like the same behaviour happening on Ubuntu 8.10 x64 if that helps at all.  I am also using a HP Scanjet 5370c.

I've packaged the new upstream version sane-backends-1.0.20 and submitted it for updates-testing. Please test and report back whether this improves your issue, thanks.

"Lightly" tested the SW as indicated by Nils Philippsen.
Packages updated. No special setup. No adjustments. Testing the device "out of the box".

[zby@cz2cpdxc ~]$ rpm -qa|grep -i sane
xsane-gimp-0.996-3.fc10.i386
sane-backends-libs-gphoto2-1.0.20-3.fc10.i386
sane-backends-libs-1.0.20-3.fc10.i386
xsane-0.996-3.fc10.i386
sane-backends-1.0.20-3.fc10.i386
libsane-hpaio-2.8.12-6.fc10.i386
[zby@cz2cpdxc ~]$ uname -a
Linux cz2cpdxc 2.6.27.24-170.2.68.fc10.i686 #1 SMP Wed May 20 23:10:16 EDT 2009 i686 i686 i386 GNU/Linux
[zby@cz2cpdxc ~]$ cat /etc/redhat-release 
Fedora release 10 (Cambridge)
[zby@cz2cpdxc ~]$ 
[zby@cz2cpdxc ~]$ sane-find-scanner
....
found USB scanner (vendor=0x03f0 [Hewlett Packard], product=0x0701 [Hewlett Packard ScanJet 5300C/5370C ]) at libusb:001:007 
[zby@cz2cpdxc ~]$ 
[zby@cz2cpdxc ~]$ scanimage -L
device `avision:libusb:001:007' is a Hewlett-Packard ScanJet 5300C flatbed scanner
[zby@cz2cpdxc ~]$
[zby@cz2cpdxc ~]$ scanimage >out.pnm
scanimage: sane_read: Error during device I/O
[zby@cz2cpdxc ~]$ su
[root@cz2cpdxc zby]# tail /var/log/messages
Jun 22 13:12:35 localhost kernel: usb 1-6.2: new full speed USB device using ehci_hcd and address 7
Jun 22 13:12:35 localhost kernel: usb 1-6.2: configuration #1 chosen from 1 choice
Jun 22 13:12:35 localhost kernel: usb 1-6.2: New USB device found, idVendor=03f0, idProduct=0701
Jun 22 13:12:35 localhost kernel: usb 1-6.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Jun 22 13:12:35 localhost kernel: usb 1-6.2: Product: Hewlett Packard ScanJet 5300C/5370C 
Jun 22 13:12:35 localhost kernel: usb 1-6.2: Manufacturer: Hewlett Packard
Jun 22 13:12:35 localhost kernel: usb 1-6.2: SerialNumber: CN11920567VE
[root@cz2cpdxc zby]# exit
#### scanner carriage is stuck flashing (3 at a time)
#### scanner carriage won't return to its start position
#### picture not OK, not complete (corrupted)
#### need to turn scanner off & on to reset
....

[zby@cz2cpdxc ~]$ scanimage --resolution=200 >out.pnm
[zby@cz2cpdxc ~]$ 
#### the scanner worked OK, picture OK ...
[zby@cz2cpdxc ~]$ scanimage --resolution=75 >out.pnm
scanimage: rounded value of resolution from 75 to 100
[zby@cz2cpdxc ~]$ 
#### the scanner worked OK, picture OK ...

[george@dragon-lx ~]$ rpm -qa|grep -i sane
sane-backends-libs-1.0.20-3.fc10.x86_64
sane-backends-libs-1.0.20-3.fc10.i386
sane-backends-debuginfo-1.0.19-12.fc10.x86_64
xsane-0.996-3.fc10.x86_64
sane-backends-1.0.20-3.fc10.x86_64
xsane-debuginfo-0.996-3.fc10.x86_64
sane-backends-libs-gphoto2-1.0.20-3.fc10.x86_64
xsane-gimp-0.996-3.fc10.x86_64
[george@dragon-lx ~]$ sane-find-scanner

  # sane-find-scanner will now attempt to detect your scanner. If the
  # result is different from what you expected, first make sure your
  # scanner is powered up and properly connected to your computer.

  # No SCSI scanners found. If you expected something different, make sure that
  # you have loaded a kernel SCSI driver for your SCSI adapter.

found USB scanner (vendor=0x03f0 [Hewlett Packard], product=0x0701 [Hewlett Packard ScanJet 5300C]) at libusb:006:003
  
[george@dragon-lx ~]$ scanimage -L
device `avision:libusb:006:003' is a Hewlett-Packard ScanJet 5300C flatbed scanner


Perform scan from terminal result OK, scan from GIMP xsane plugin result ok, scan from digikam result ok. It appears your fix is accessing the scanner properly and aquiring the image as expected. Thank you very much, it was a bit anoying starting up an old windows machine just to use the scanner.

If made a new sane-backends-1.0.20-4 release for this update, please check this out.

(In reply to comment #5)
[...]
> [zby@cz2cpdxc ~]$ scanimage -L
> device `avision:libusb:001:007' is a Hewlett-Packard ScanJet 5300C flatbed
scanner
> [zby@cz2cpdxc ~]$
> [zby@cz2cpdxc ~]$ scanimage >out.pnm
> scanimage: sane_read: Error during device I/O

Please check if the device file (which should be /dev/bus/usb/001/007) has the correct permissions, i.e. your user can read and write it. If this is the case and you can reproduce the error, I'd suspect a kernel problem (due to the I/O error). Then please file a separate bug against the kernel component and add me to the CC list.

Created attachment 349090 [details]
A corrupted image as a result of scanning.

The attached file demostrates the form the data comes from the scanner while scanning with no additional options.

An additional info to the comment #7:
[zby@cz2cpdxc ~]$ scanimage -L
device `avision:libusb:001:004' is a Hewlett-Packard ScanJet 5300C flatbed scanner
[zby@cz2cpdxc ~]$ 
[zby@cz2cpdxc ~]$ ls -l /dev/bus/usb/001/004 
crw-rw-r--+ 1 root root 189, 3 23. čen 14.31 /dev/bus/usb/001/004
[zby@cz2cpdxc ~]$ 
[zby@cz2cpdxc ~]$ scanimage > out.pnm
scanimage: sane_read: Error during device I/O
[zby@cz2cpdxc ~]$ 
[zby@cz2cpdxc ~]$ ls -l out.pnm
-rw-rw-r-- 1 zby zby 854821 23. čen 14.41 out.pnm
[zby@cz2cpdxc ~]$ evince out.pnm
### turned the scanner off and back on and then:
[zby@cz2cpdxc ~]$ scanimage -L

No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).
[zby@cz2cpdxc ~]$ 
## Looks like the scanner cannot even be found after failing to scan the image

To all involved & recepients, please accept my appology for testing the stuff with version sane-backends-1.0.20-3 instead of sane-backends-1.0.20-4 .
My comments are not related to the new update, however some of you may find my attached PNM file helpful/interesting.
Thank you. Zbynek.

sane-backends-1.0.20-4.fc10 has been pushed to the Fedora 10 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update sane-backends'.  You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F10/FEDORA-2009-6741

[root@cz2cpdxc ARC]# yum update xsane*
Loaded plugins: refresh-packagekit
updates-testing                                                                                                                                     | 3.4 kB     00:00     
Excluding Packages in global exclude list
Finished
Setting up Update Process
No Packages marked for Update
[root@cz2cpdxc ARC]# yum update libsane*
Loaded plugins: refresh-packagekit
Excluding Packages in global exclude list
Finished
Setting up Update Process
No Packages marked for Update
[root@cz2cpdxc ARC]# exit
exit
[zby@cz2cpdxc ARC]$ rpm -qa|grep -i sane
xsane-gimp-0.996-3.fc10.i386
xsane-0.996-3.fc10.i386
sane-backends-libs-1.0.20-4.fc10.i386
libsane-hpaio-2.8.12-6.fc10.i386
sane-backends-1.0.20-4.fc10.i386
sane-backends-libs-gphoto2-1.0.20-4.fc10.i386
[zby@cz2cpdxc ARC]$ uname -a
Linux cz2cpdxc 2.6.27.24-170.2.68.fc10.i686 #1 SMP Wed May 20 23:10:16 EDT 2009 i686 i686 i386 GNU/Linux
[zby@cz2cpdxc ARC]$ rpm -qa|grep -i kernel
kerneloops-0.12-2.fc10.i386
kernel-devel-2.6.27.21-170.2.56.fc10.i686
kernel-2.6.27.25-170.2.72.fc10.i686
kernel-2.6.27.24-170.2.68.fc10.i686
kernel-headers-2.6.27.25-170.2.72.fc10.i386
kernel-devel-2.6.27.25-170.2.72.fc10.i686
kernel-firmware-2.6.27.25-170.2.72.fc10.noarch
kernel-2.6.27.21-170.2.56.fc10.i686
kernel-devel-2.6.27.24-170.2.68.fc10.i686
[zby@cz2cpdxc ARC]$ scanimage -L
device `avision:libusb:001:006' is a Hewlett-Packard ScanJet 5300C flatbed scanner
[zby@cz2cpdxc ARC]$           
[zby@cz2cpdxc ARC]$ ls -l /dev/bus/usb/001/006 
crw-rw-r--+ 1 root root 189, 5 29. čen 13.43 /dev/bus/usb/001/006
[zby@cz2cpdxc ARC]$ scanimage --resolution=200 > ~/out.pnm
[zby@cz2cpdxc ARC]$ file ~/out.pnm
/home/zby/out.pnm: Netpbm PPM "rawbits" image data
[zby@cz2cpdxc ARC]$ eog ~/out.pnm
[zby@cz2cpdxc ARC]$ scanimage --resolution=100 > ~/out.pnm
[zby@cz2cpdxc ARC]$ file ~/out.pnm
/home/zby/out.pnm: Netpbm PPM "rawbits" image data
[zby@cz2cpdxc ARC]$ eog ~/out.pnm
[zby@cz2cpdxc ARC]$ scanimage --resolution=100 --format=tiff > ~/out
[zby@cz2cpdxc ARC]$ file ~/out
/home/zby/out: TIFF image data, big-endian
[zby@cz2cpdxc ARC]$ tiffinfo ~/out
TIFF Directory at offset 0x8 (8)
  Subfile Type: (0 = 0x0)
  Image Width: 848 Image Length: 1165
  Resolution: 100, 100 pixels/inch
  Bits/Sample: 8
  Compression Scheme: None
  Photometric Interpretation: RGB color
  Orientation: row 0 top, col 0 lhs
  Samples/Pixel: 3
  Rows/Strip: 1165
  Min Sample Value: 0
  Max Sample Value: 255
  Planar Configuration: single image plane
[zby@cz2cpdxc ARC]$ eog ~/out
[zby@cz2cpdxc ARC]$ scanimage --resolution=140 --format tiff > ~/out
scanimage: sane_read: Error during device I/O
[zby@cz2cpdxc ARC]$ file ~/out
/home/zby/out: TIFF image data, big-endian
[zby@cz2cpdxc ARC]$ eog ~/out
## The image is corrupted - just like the one I've attached to the Comment #8
## The scanner carriage returned back to its startoff position at least
## I'm leaving the scanner in its current state:
[zby@cz2cpdxc ARC]$ scanimage --resolution=100 --format tiff > ~/out
scanimage: no SANE devices found
[zby@cz2cpdxc ARC]$ 
## I'm disconnecting the USB scanner cable and plugging back in after a few secs:
[zby@cz2cpdxc ARC]$ scanimage -L

No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).
[zby@cz2cpdxc ARC]$ 
## Now, the power cord is disconnected and plugged back in after a while:
[zby@cz2cpdxc ARC]$ scanimage -L

No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).
[zby@cz2cpdxc ARC]$ 
## I'm disconnecting the USB scanner cable and plugging back in after a few secs again:
[zby@cz2cpdxc ARC]$ scanimage -L

No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).
[zby@cz2cpdxc ARC]$ 
## Scanning an image at the resolution of 100 od 200dpi is OK, but it doesn't work for DPIs in between.
[zby@cz2cpdxc ARC]$

sane-backends-1.0.20-4.fc10 has been pushed to the Fedora 10 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update sane-backends'.  You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F10/FEDORA-2009-6741

sane-backends-1.0.20-4.fc10 has been pushed to the Fedora 10 stable repository.  If problems still persist, please make note of it in this bug report.

I have upgraded to FC11 which and it appears both FC10 and FC11 files are present..I guess I need to do some system clean up...however I am still able to scan and import images from the scanner.  Not sure how the others are making out but I am pleased with the new backend version.

rpm -qa|grep -i sane
sane-backends-libs-1.0.20-4.fc10.x86_64
xsane-gimp-0.996-7.fc11.x86_64
sane-backends-debuginfo-1.0.20-4.fc11.x86_64
xsane-0.996-7.fc11.x86_64
sane-backends-1.0.20-4.fc10.x86_64
sane-backends-libs-gphoto2-1.0.20-4.fc10.x86_64
xsane-debuginfo-0.996-3.fc10.x86_64
sane-backends-libs-1.0.20-4.fc10.i386