EM stability

Gleb Smirnoff glebius at FreeBSD.org
Mon Nov 13 12:22:31 UTC 2006

On Sun, Nov 12, 2006 at 02:26:36PM -0600, Barry Boes wrote:
B> After the last hang I added giant locks back in and the machine has
B> been up since.
B> I don't have a serial console, just a graphic console.  When the
B> machine hangs it stops replying to ethernet packets at all protocol
B> levels and doesn't respond to keyboard input in any way, virtual
B> console or otherwise.  If I run a script of the form
B>    while(1)
B>      sleep 1
B>      date >> datelog
B>    end
B> the file stops updating when the machine hangs.
B> I will define the debugger in the kernel (options DDB, right?), attach
B> a serial console, and do what I can to get more information on the
B> problem.

Yes, this looks like something is running in an endless loop. Once
you compile kernel with debugger, you should enter in several times
and see the backtraces. Usually, they will be inside this cycle.

Totus tuus, Glebius.

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