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Re: Silent deadlock possible in current sources

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Mikheev, Vadim" <vmikheev(at)SECTORBASE(dot)COM>
Cc: pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: Silent deadlock possible in current sources
Date: 2000-08-31 03:23:27
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Lists: pgsql-hackers
"Mikheev, Vadim" <vmikheev(at)SECTORBASE(dot)COM> writes:
>> Although this specific lockup mode didn't exist in 7.0.*, it does
>> suggest a possible cause of the deadlocks-with-no-deadlock-report
>> behavior that a couple of people have reported with 7.0: maybe there
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> is another logic path that allows a deadlock involving two 
>> buffer locks, or a buffer lock and a normal lock.  I'm on the
>> warpath now ...

> Buffer locks were implemented in 6.5.

Yeah, but we've only heard about silent deadlocks from people running
7.0.  I'm speculating that some "unrelated" 7.0 change is interacting
badly with the buffer lock management.  Haven't gone digging yet, but
I will.

			regards, tom lane

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