Public bug reported:
I am experiencing a kernel hang when using various external hard drives
and my printer (Canon MP610 driver), all of which I connect using USB.
The general symptom is that when I connect either of these devices, my
system freezes up completely after about 10 minutes. They work just fine
prior to that moment.
I can reproduce this within two minutes by connecting a USB flash drive
and running "sudo dd if=/dev/sdb1 of=/dev/null bs=4K"
I am running Ubuntu 10.10 64-bit on a Dell Studio XPS 16 (Motherboard
1647, Core i5, ATI Radeon HD5730).
I've looked through some of my logs (/var/log/messages seemed the most
useful) but haven't been able to find any kind of USB related logging
nor anything interesting happening prior to the hang. Is there anyway to
enable more verbose debugging of the USB subsystem or some other log I
should be looking at?
I have tested this using various kernels with the following results:
2.6.32-28 (Lucid) - WORKS
2.6.35-22 (Maverick) - HANGS
2.6.35-24 (Maverick) - HANGS
2.6.35-25 (Maverick) - HANGS
2.6.36-020636.201010210905 (mainline from kernel-ppa) - HANGS
So this appears to be a regression introduced at some point between
2.6.32-28 and 2.6.35-22.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/721954
Title:
Kernel hangs when using USB storage or printer
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