| From: | Jeff Davis <pgsql(at)j-davis(dot)com> |
|---|---|
| To: | Alexander Lakhin <exclusion(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Is this a problem in GenericXLogFinish()? |
| Date: | 2023-10-26 05:06:23 |
| Message-ID: | 8a1c93b33b6e0aac92b771339cce520eac0adf96.camel@j-davis.com |
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| Lists: | pgsql-hackers |
On Thu, 2023-10-26 at 07:00 +0300, Alexander Lakhin wrote:
> It looks like the buffer is not dirty in the problematic call.
Thank you for the report! I was able to reproduce and observe that the
buffer is not marked dirty.
The call (hashovfl.c:671):
XLogRegisterBuffer(1, wbuf, REGBUF_STANDARD)
is followed unconditionally by:
PageSetLSN(BufferGetPage(wbuf), recptr)
so if the Assert were not there, it would be setting the LSN on a page
that's not marked dirty. Therefore I think this is a bug, or at least
an interesting/unexpected case.
Perhaps the registration and the PageSetLSN don't need to happen when
nitups==0?
Regards,
Jeff Davis
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