[issue2061] USB keyboard boot panic

Samuel J. Greear (via DragonFly issue tracker) sinknull at leaf.dragonflybsd.org
Mon May 2 01:10:37 PDT 2011

New submission from Samuel J. Greear <sjg at evilcode.net>:

Since enabling ehci by default booting with my USB keyboard plugged in has 
caused the box to panic almost every time (9 out of 10 or more), when it does 
not panic the keyboard works. Prior to this (ohci only) the keyboard would not 
work if plugged in during boot almost every time (9 out of 10 or more), but 
would work fine every time if plugged in after boot. Plugging it in after boot 
still works fine w/ ehci.

The panic in question is panic: ohci_add_done: addr 0x???????? not found, the 
call stack includes ohci_intr().

It seems the ohci driver is servicing an interrupt and the conditions are right 
to enter ohci_add_done(), but the ohci_hash_find_*'s are unsuccessful.

Adding kprintf's to ohci_hash_add_* and ohci_hash_rem_* cause the box to boot 
with a working keyboard a much greater percentage of the time, seemingly 
indicating a race / something timing related.

messages: 9854
nosy: sjg
priority: bug
status: unread
title: USB keyboard boot panic

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