"panic: spin lock entropy harvest mutex not in order list"

Robert Watson rwatson at freebsd.org
Mon Oct 11 01:27:56 PDT 2004

On Sun, 10 Oct 2004, Robert Huff wrote:

> 	About 2000 UTC Sunday I cvsuped system source and rebuilt.
> 	"make buildworld" went fine.  (Log available)
> 	"make buildkernel" also good.  (Log also available)
> 	I installed the new kernel and rebooted.
> 	When the system came up, I got:
> 	Real memory: XXXXXXXXX
> 	Avail memory: YYYYYYYYY
> 	panic: spin lock entropy harvest mutex not in order list
> 	KDB: enter: panic
> 	[thread 0]
> 	ddb>

When I committed the rewrite of the /dev/random entropy harvesting
locking, I ommitted to commit the change to subr_witness.c telling witness
about the lock change; witness requires that all spin locks be identified
in the hard-coded lock order (although maybe only if witness skipspin is
off, hence more people not running into it?).  I've merged the change to
subr_witness.c as change 1.182 as of a minute or two ago.  Please letme
know if that change doesn't fix the problem.


Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert at fledge.watson.org      Principal Research Scientist, McAfee Research

> 	at which point neither the USB or PS/2 keyboards were
> recognized.  (i.e. no trace or dump)
> 	I still have a workable machine (and volunteer as poster
> person for why the procedure in the Handbook is correct); I also
> have a debug kernel, dmesg (from the old kernel - no hardware
> changes) and kernel config available on request.
> 	I checked the mailing list archives and UPDATING and found
> nothing which seemed applicable.
> 	Have I just caught a hiccup in the development process?
> 				Robert Huff
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