Description of problem: On connecting a generic USB flash disk, get SCSI errors. This drive worked fine on RH8.0, RH9, FC1 and still works on my RHEL 3WS laptop, but not under FC2. I assume it's a 2.6 problem. On connection, CPU usage goes right up (500MHz K6-2, though); system almost freezes (mouse barely responsive); floppy has light on and makes noises as if it seeks for a disk; and I get the following messages from the kernel until the device is removed (note the increments to device address - each time, the usb stick's LED lights up, then goes out): ohci_hcd 0000:00:02.0: wakeup usb 1-2: new full speed USB device using address 4 scsi1 : SCSI emulation for USB Mass Storage devices Vendor: Generic Model: Flash Disk Rev: 7.78 Type: Direct-Access ANSI SCSI revision: 02 SCSI device sda: 64000 512-byte hdwr sectors (33 MB) sda: Write Protect is off sda: Mode Sense: 03 00 00 00 sda: assuming drive cache: write through sda:SCSI error : <1 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 SCSI error : <1 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 SCSI error : <1 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 63992 Buffer I/O error on device sda, logical block 7999 SCSI error : <1 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 63992 Buffer I/O error on device sda, logical block 7999 SCSI error : <1 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 unable to read partition table Attached scsi removable disk sda at scsi1, channel 0, id 0, lun 0 Attached scsi generic sg0 at scsi1, channel 0, id 0, lun 0, type 0 USB Mass Storage device found at 4 hub 1-0:1.0: port 2 disabled by hub (EMI?), re-enabling... usb 1-2: USB disconnect, address 4 usb 1-2: new full speed USB device using address 5 scsi2 : SCSI emulation for USB Mass Storage devices Vendor: Generic Model: Flash Disk Rev: 7.78 Type: Direct-Access ANSI SCSI revision: 02 SCSI device sda: 64000 512-byte hdwr sectors (33 MB) sda: Write Protect is off sda: Mode Sense: 03 00 00 00 sda: assuming drive cache: write through sda:SCSI error : <2 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 SCSI error : <2 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 SCSI error : <2 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 63992 Buffer I/O error on device sda, logical block 7999 SCSI error : <2 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 63992 Buffer I/O error on device sda, logical block 7999 SCSI error : <2 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 unable to read partition table Attached scsi removable disk sda at scsi2, channel 0, id 0, lun 0 Attached scsi generic sg0 at scsi2, channel 0, id 0, lun 0, type 0 sda : READ CAPACITY failed. sda : status=0, message=00, host=7, driver=00 sda : sense not available. sda: Write Protect is off sda: Mode Sense: 00 00 00 00 sda: assuming drive cache: write through USB Mass Storage device found at 5 hub 1-0:1.0: port 2 disabled by hub (EMI?), re-enabling... usb 1-2: USB disconnect, address 5 sda : READ CAPACITY failed. sda : status=0, message=00, host=1, driver=00 sda : sense not available. sda: Write Protect is off sda: Mode Sense: 00 00 00 00 sda: assuming drive cache: write through sda:<3>scsi2 (0:0): rejecting I/O to device being removed Buffer I/O error on device sda, logical block 0 scsi2 (0:0): rejecting I/O to device being removed Buffer I/O error on device sda, logical block 0 scsi2 (0:0): rejecting I/O to device being removed Buffer I/O error on device sda, logical block 262143 scsi2 (0:0): rejecting I/O to device being removed Buffer I/O error on device sda, logical block 262143 scsi2 (0:0): rejecting I/O to device being removed Buffer I/O error on device sda, logical block 0 unable to read partition table usb 1-2: new full speed USB device using address 6 scsi3 : SCSI emulation for USB Mass Storage devices Vendor: Generic Model: Flash Disk Rev: 7.78 Type: Direct-Access ANSI SCSI revision: 02 SCSI device sda: 64000 512-byte hdwr sectors (33 MB) sda: Write Protect is off sda: Mode Sense: 03 00 00 00 sda: assuming drive cache: write through sda:SCSI error : <3 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 SCSI error : <3 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 SCSI error : <3 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 63992 Buffer I/O error on device sda, logical block 7999 SCSI error : <3 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 63992 Buffer I/O error on device sda, logical block 7999 SCSI error : <3 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 unable to read partition table Attached scsi removable disk sda at scsi3, channel 0, id 0, lun 0 Attached scsi generic sg0 at scsi3, channel 0, id 0, lun 0, type 0 USB Mass Storage device found at 6 hub 1-0:1.0: port 2 disabled by hub (EMI?), re-enabling... usb 1-2: USB disconnect, address 6 usb 1-2: new full speed USB device using address 7 scsi4 : SCSI emulation for USB Mass Storage devices Vendor: Generic Model: Flash Disk Rev: 7.78 Type: Direct-Access ANSI SCSI revision: 02 SCSI device sda: 64000 512-byte hdwr sectors (33 MB) sda: Write Protect is off sda: Mode Sense: 03 00 00 00 sda: assuming drive cache: write through sda:SCSI error : <4 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 SCSI error : <4 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 SCSI error : <4 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 63992 Buffer I/O error on device sda, logical block 7999 SCSI error : <4 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 63992 Buffer I/O error on device sda, logical block 7999 SCSI error : <4 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 unable to read partition table Attached scsi removable disk sda at scsi4, channel 0, id 0, lun 0 Attached scsi generic sg0 at scsi4, channel 0, id 0, lun 0, type 0 sda : READ CAPACITY failed. sda : status=0, message=00, host=7, driver=00 sda : sense not available. sda: Write Protect is off sda: Mode Sense: 00 00 00 00 sda: assuming drive cache: write through USB Mass Storage device found at 7 hub 1-0:1.0: port 2 disabled by hub (EMI?), re-enabling... usb 1-2: USB disconnect, address 7 sda : READ CAPACITY failed. sda : status=0, message=00, host=1, driver=00 sda : sense not available. sda: Write Protect is off sda: Mode Sense: 00 00 00 00 sda: assuming drive cache: write through sda:<3>scsi4 (0:0): rejecting I/O to device being removed Buffer I/O error on device sda, logical block 0 scsi4 (0:0): rejecting I/O to device being removed Buffer I/O error on device sda, logical block 0 scsi4 (0:0): rejecting I/O to device being removed Buffer I/O error on device sda, logical block 262143 scsi4 (0:0): rejecting I/O to device being removed Buffer I/O error on device sda, logical block 262143 scsi4 (0:0): rejecting I/O to device being removed Buffer I/O error on device sda, logical block 0 unable to read partition table usb 1-2: new full speed USB device using address 8 scsi5 : SCSI emulation for USB Mass Storage devices Vendor: Generic Model: Flash Disk Rev: 7.78 Type: Direct-Access ANSI SCSI revision: 02 SCSI device sda: 64000 512-byte hdwr sectors (33 MB) sda: assuming drive cache: write through sda:SCSI error : <5 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 SCSI error : <5 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 SCSI error : <5 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 63992 Buffer I/O error on device sda, logical block 7999 SCSI error : <5 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 63992 Buffer I/O error on device sda, logical block 7999 SCSI error : <5 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 unable to read partition table Attached scsi disk sda at scsi5, channel 0, id 0, lun 0 Attached scsi generic sg0 at scsi5, channel 0, id 0, lun 0, type 0 USB Mass Storage device found at 8 hub 1-0:1.0: port 2 disabled by hub (EMI?), re-enabling... usb 1-2: USB disconnect, address 8 usb 1-2: new full speed USB device using address 9 scsi6 : SCSI emulation for USB Mass Storage devices Vendor: Generic Model: Flash Disk Rev: 7.78 Type: Direct-Access ANSI SCSI revision: 02 SCSI device sda: 64000 512-byte hdwr sectors (33 MB) sda: assuming drive cache: write through sda:SCSI error : <6 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 SCSI error : <6 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 SCSI error : <6 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 63992 Buffer I/O error on device sda, logical block 7999 SCSI error : <6 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 63992 Buffer I/O error on device sda, logical block 7999 SCSI error : <6 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 unable to read partition table Attached scsi disk sda at scsi6, channel 0, id 0, lun 0 Attached scsi generic sg0 at scsi6, channel 0, id 0, lun 0, type 0 USB Mass Storage device found at 9 hub 1-0:1.0: port 2 disabled by hub (EMI?), re-enabling... usb 1-2: USB disconnect, address 9 usb 1-2: new full speed USB device using address 10 scsi7 : SCSI emulation for USB Mass Storage devices Vendor: Generic Model: Flash Disk Rev: 7.78 Type: Direct-Access ANSI SCSI revision: 02 SCSI device sda: 64000 512-byte hdwr sectors (33 MB) sda: assuming drive cache: write through sda:SCSI error : <7 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 SCSI error : <7 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 SCSI error : <7 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 63992 Buffer I/O error on device sda, logical block 7999 SCSI error : <7 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 63992 Buffer I/O error on device sda, logical block 7999 SCSI error : <7 0 0 0> return code = 0x70000 end_request: I/O error, dev sda, sector 0 Buffer I/O error on device sda, logical block 0 unable to read partition table Attached scsi disk sda at scsi7, channel 0, id 0, lun 0 Attached scsi generic sg0 at scsi7, channel 0, id 0, lun 0, type 0 USB Mass Storage device found at 10 hub 1-0:1.0: port 2 disabled by hub (EMI?), re-enabling... usb 1-2: USB disconnect, address 10 usb 1-2: new full speed USB device using address 11 Version-Release number of selected component (if applicable): All so far. How reproducible: Every time. Steps to Reproduce: 1. Connect USB stick; 2. Watch system freak out; 3. Remove stick, wait a minute for system to stabilise. Actual results: My system becomes unusable, flash disk is not mountable. Expected results: Flash disk becomes mountable after connecting it to computer, at no significant cpu cost, as on 2.4-based systems. Additional info: USB overhead is very high anyway: when turning on my Epson CX6400 printer/scanner, load increases too much. [root@localhost root]# lspci 00:00.0 Host bridge: ALi Corporation M1541 (rev 04) 00:01.0 PCI bridge: ALi Corporation M1541 PCI to AGP Controller (rev 04) 00:02.0 USB Controller: ALi Corporation USB 1.1 Controller (rev 03) 00:07.0 ISA bridge: ALi Corporation M1533 PCI to ISA Bridge [Aladdin IV] (rev b4) 00:0e.0 Multimedia audio controller: C-Media Electronics Inc CM8738 (rev 10) 00:0f.0 IDE interface: ALi Corporation M5229 IDE (rev 20) 01:00.0 VGA compatible controller: nVidia Corporation NV18 [GeForce4 MX 440 AGP 8x] (rev a4)
Fixed in 2.6.10-1.12_FC2