Re: FailedAssertion("!(PrivateRefCount[i] == 0)", File: "bufmgr.c", Line: 1741

On Thu, May 31, 2012 03:30, Robert Haas wrote:
> On Wed, May 30, 2012 at 6:00 PM, Erik Rijkers <er(at)xs4all(dot)nl> wrote:
>> directory
>> 2012-05-30 23:40:57.909 CEST 3909 CONTEXT:  writing block 5152 of relation base/21268/26569
>>        xlog redo multi-insert (init): rel 1663/21268/26581; blk 3852; 35 tuples
>> TRAP: FailedAssertion("!(PrivateRefCount[i] == 0)", File: "bufmgr.c", Line: 1741)
>> 2012-05-30 23:40:58.006 CEST 5331 FATAL:  could not open file "base/21268/26569": No such file
>> or
>> directory
>> 2012-05-30 23:40:58.006 CEST 5331 CONTEXT:  writing block 5153 of relation base/21268/26569
>> 2012-05-30 23:40:59.661 CEST 3908 LOG:  startup process (PID 3909) was terminated by signal 6:
>> Aborted
>> 2012-05-30 23:40:59.661 CEST 3908 LOG:  terminating any other active server processes
>
> Hmm. I set up what I believe to be the same test case you were using,
> and it's not crashing for me. In fact, with the latest code, I
> haven't been able to produce any error at all. When I reverted my
> last commit, I managed to get this:
>
> ERROR: could not open relation with OID 18229
> STATEMENT: select current_setting('port') port, count(*) from t
>
> ...but just once, and with no other error messages. So I'm either
> missing a step somewhere, or something about your system just happens
> to tickle this moreso than on mine.
>

In my test, I run the bash code (the bits that I posted earlier) in a while loop so that the table
is CREATEd, COPYied into, and DROPped every few seconds -- perhaps that wasn't clear. That loop
is necessary; a few iterations are often successful.

I can test it today on a few other systems to see if it is reproducible.

thanks,

Erik Rijkers