[Bug 154092] Re: USB dies when using mass-storage

[Michael B. Trausch]

Here is what happens when USB dies.  The CPU usage on I/O wait goes way
up (to 100% on one core, and sometimes both), the USB processes and the
process that was using USB is stuck in a state of uninterruptable sleep,
and the only way to fix the issue is to re-boot.  This happens on any
activity ranging from the creation of a new 40 GB ext2/3 fs, to checking
an ext2 filesystem. to lots of data transfer after mkfs.  IOW, it seems
to be somewhat random, but I can only actually trigger the issue when
using some form of USB mass storage.

I am about to try this again after rebooting with a small flash drive to
see if I can trigger it there.  Larger devices certainly trigger it all
the time.

Sometimes, some error messages show up in dmesg *before* the drive
fails, about resetting low speed devices.  I don't know why, because
everything in this system should be USB 2.0, and I know that the drive
is a USB 2.0 device.

I don't think that the APIC errors are related, though I suppose
anything is possible.  I get them all the time, but I do not know why.

** Attachment added: "usb error.png"
   http://launchpadlibrarian.net/10060885/usb%20error.png

-- 
USB dies when using mass-storage
https://bugs.launchpad.net/bugs/154092
You received this bug notification because you are a member of Kernel
Bugs, which is a bug contact for linux-meta in ubuntu.