On Thu, 5 Oct 2006, Magnus Hagander wrote:

Hi there,

I'm looking into strange locking, which happens on WinXP SP2
SMP machine running 8.1.4 with stats_row_level=on. This is
the only combination (# of cpu and stats_row_level) which has
problem - SMP + stats_row_level.

The same test runs fine with one cpu (restarted machine with
/numproc=1) disregarding to stats_row_level option.

Customer's application loads data into database and sometimes
process stopped, no cpu, no io activity. PgAdmin shows
current query is 'COMMIT'.
I tried to attach gdb to postgres and client processes, but
backtrace looks useless (see below). Running vacuum analyze
of this database in separate process cause loading process to
continue ! Weird.

It's interesting, that there is no problem with 8.2beta1 in
all combinations !  Any idea what changes from 8.1.4 to
8.2beta1 could affect the problem ?

There is a new implementations of semaphores in 8.2. That could possibly
be it.

I backported them to REL8_1_STABLE but it doesn't helped. Any other idea
what to do, or how to debug the situation ?

Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83

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