On Thu, 20 Apr 2006, Henri Hennebert wrote:
I upgrade a web, squid, mail server (under SMP with 2 pentium III) to 6.1-RC
(Apr 9 2006) and encounter 2 `freezing'.
The system is still responding to http requests but I can't login on the
console or through ssh -- no shell prompt. No more mail delivery.
I break to KDB and found more then 1000 sendmail processes waiting for
devfs...
call boot(0) can't complete the shutdown process.
I join the KDB informations. Let me know if more informations are needed.
Are you running with WITNESS and INVARIANTS enabled? If not, could you do so
and see if the problem is reproduceable, and if so, whether or not WITNESS
(and friends) generate any warnings?
It looks like something has leaked a lock, resulting in deadlock. The
question is, however, which lock, and where. WITNESS may be able to provide
some insight into this; if you could run "show alllocks" with WITNESS in
place, that would be helpful also.
Robert N M Watson
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