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From: John Baldwin <jhb@freebsd.org>
To: Kris Kennaway <kris@obsecurity.org>
Date: Tue, 28 Feb 2006 12:07:37 -0500
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Cc: stable@freebsd.org
Subject: Re: panic: thread with borrowed priority returning to userland
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On Saturday 25 February 2006 09:17, Kris Kennaway wrote:
> Panic on 6.1-PRERELEASE (package build machine):
> 
> db> wh
> Tracing pid 85657 tid 100133 td 0xc2612600
> kdb_enter(c06cabdd,c07250c0,c06cc327,cdca4cac,100) at kdb_enter+0x30
> panic(c06cc327,2,c06cc3bf,267,2814d4e8) at panic+0xd5
> sched_userret(c2612600,c04e290d,c0724dc0,1,2814d4e8) at sched_userret+0x21
> userret(c2612600,cdca4d38,63,100,1010000) at userret+0xd8
> ast(cdca4d38) at ast+0x556
> doreti_ast() at doreti_ast+0x17
> 
> Core available.

Does this thread (tid 100133) hold any locks?  That panic would
be indicative of that since it drops its inherited priority when it
releaes a contested mutex.

-- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org