kernel panics on sio interrupt-level overflows

Kris Kennaway kris at
Tue Mar 29 14:58:36 PST 2005

On Tue, Mar 29, 2005 at 12:09:19PM +0200, Oleg Tarasov wrote:
> Hello,
> This problem had unusual solution. It seems the key to this problem is
> that FreeBSD 5.3-STABLE-p5 (I have updated my system) has DEADLOCKS
> when intensively using sio device on high speed (115200) with SMP support.
> It seems that MPSAFE causes those deadlocks. Turning
> debug.mpsafenet="0"
> in /boot/loader.conf
> makes the system to work fine & stable instead of panicing every hour
> or more often

Does enabling WITNESS support (and possibly excluding
WITNESS_SKIPSPIN) produce any diagnostics?

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 187 bytes
Desc: not available
Url :

More information about the freebsd-stable mailing list