Thanks @legolas558, I checked all cables and exchanged most of my USB equipment (hubs and cables). I tested in combinations which would reveal a faulty USB part. Inspired by your comment I opened the machine and checked the internal cable connections as well. They're all fine.
I `ddrescue` test case causes a kernel panic in 3.17-rc6, now, photo attached[1]. This occurs ~90 % of the time. I attach the log file of `ddrescue` 1.7.0 as well[2], maybe it can serve to produce a test file for you. It definitely works in the non-persistent live system based on 3.13.0-24-generic. --- [1] I'm currently stuck with `linux-crashtools`, please help me http://askubuntu.com/questions/529452/how-to-cause-a-test-crash-with-kdump for a text output of the panic stack. [2] Although the wiki states no compressed attachements, there's no way of figuring out how to attach a second file... ** Attachment added: "photo of kernel panic stack trace; ddrescue log file" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1371233/+attachment/4218432/+files/scsi_kernel_panic.tar.xz -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1371233 Title: USB 3.0 connection is unreliable + xHCI xhci_drop_endpoint called with disabled ep To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1371233/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
