On Wed, 25 May 2016, Mathieu Malaterre wrote: > Hi, > > I am trying to track down an issue that happen during Debian > Installation from a USB key onto a Mac Mini G4 (PPC) [*]. > > Basically the USB key is working nicely (`badblocks` is fine), however > under this specific circumstances, the USB key needs to be physically > removed and then re-plugged so that it can be read. > > dmesg log excerpt: > > [ 4.259597] scsi 2:0:0:0: Direct-Access SanDisk Cruzer Mini > 0.2 PQ: 0 ANSI: 2 > [ 4.265282] sd 2:0:0:0: [sdb] 2001888 512-byte logical blocks: > (1.02 GB/977 MiB) > [ 4.267027] sd 2:0:0:0: [sdb] Write Protect is off > [ 4.267040] sd 2:0:0:0: [sdb] Mode Sense: 03 00 00 00 > [ 4.268149] sd 2:0:0:0: [sdb] No Caching mode page found > [ 4.268162] sd 2:0:0:0: [sdb] Assuming drive cache: write through > [ 4.393824] usb 1-2: reset high-speed USB device number 3 using ehci-pci > [ 4.653835] usb 1-2: reset high-speed USB device number 3 using ehci-pci > [ 4.913832] usb 1-2: reset high-speed USB device number 3 using ehci-pci > [ 5.177821] usb 1-2: reset high-speed USB device number 3 using ehci-pci > [ 5.437844] usb 1-2: reset high-speed USB device number 3 using ehci-pci > [ 5.697847] usb 1-2: reset high-speed USB device number 3 using ehci-pci > [ 5.831893] sd 2:0:0:0: [sdb] tag#0 FAILED Result: > hostbyte=DID_ERROR driverbyte=DRIVER_OK > [ 5.831913] sd 2:0:0:0: [sdb] tag#0 CDB: Read(10) 28 00 00 00 00 00 > 00 00 08 00 > [ 5.831919] blk_update_request: I/O error, dev sdb, sector 0 > [ 5.831926] Buffer I/O error on dev sdb, logical block 0, async page read > > > I failed so far to reproduce it, since anytime I try to `mount` it it works. > > Comments welcome on how to track this down ? If you can't reproduce a failure, you can't track it down. Also, an installation kernel is not well suited to tracking failures. It's a somewhat unstable environment without all the resources that would normally be available. If you can acquire a usbmon trace showing what happens when the flash drive is plugged in and the reset occurs, that would help. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
