Complete hang on 9.0-RELEASE

Attilio Rao attilio at
Mon Feb 27 15:36:53 UTC 2012

2012/2/27, Arnaud Lacombe <lacombar at>:
> Hi,
> On Tue, Feb 14, 2012 at 11:41 AM, Arnaud Lacombe <lacombar at> wrote:
>> Hi folks,
>> For the records, I was running some tests yesterday on top of a
>> 9.0-RELEASE, amd64, kernel when the box hanged. At the time of the
>> hang, the box was running a process with about 2800 threads with heavy
>> IPC between 1400 writers and 1400 readers. The box was in single user
>> mode (/bin/sh coming from FreeBSD 7.4-STABLE). Here is the beginning
>> of the dmesg:
> This happened a second time, now with FreeBSD 8.2-RELEASE. Complete
> machine hang. The machine was running about 4000 threads in a single
> process, all the other condition are the same.

can you please break in your kernel via KDB, collect the following
informations from the DDB prompt:
- ps
- alltrace
- show allpcpu
- possibly get a coredump with 'call doadump'

and in the end provide all those along with kernel binary and possibly
sources somewhere?


Peace can only be achieved by understanding - A. Einstein

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