uaudio attach panic: Giant not locked

Robert Watson rwatson at
Wed Aug 5 11:43:13 UTC 2009

On Wed, 5 Aug 2009, Ed Schouten wrote:

> * Lucius Windschuh <lwindschuh at> wrote:
>> So I updated my machine to CURRENT r196062 and use a USB audio
>> converter. Attaching it to the machine leads to a kernel panic:
>> <snip>
> I suspect this has something to do with the Newbus locking, which causes 
> some pieces of code to run without Giant held, while they previously did.

There's a patch in the re@ queue to re-add Giant around newbus attachment, per 
John Baldwin's request.  However, committing that patch is stalled while 
issues with the svn->cvs export of the new RELENG_8 branch are resolved.  I 
expect to see the patch go into the tree RSN.

Robert N M Watson
Computer Laboratory
University of Cambridge

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