On Dec 26, 2011, at 8:08 AM, Ben Chobot wrote:
> Yesterday I had a problem on a 64-bit 9.1.1 install:
>
> # select version();
> version
>
> ----------------------------------------------------------------------------------------------------------------
> PostgreSQL 9.1.1 on x86_64-pc-linux-gnu, compiled by gcc-4.6.real
> (Ubuntu/Linaro 4.6.1-9ubuntu3) 4.6.1, 64-bit
> (1 row)
>
>
> The logs showed this anomaly:
>
> 2011-12-25T19:33:18+00:00 pgdb2-vpc postgres[27546]: [74474-1] ERROR:
> invalid memory alloc request size 18446744073709551613
> 2011-12-25T19:33:18+00:00 pgdb2-vpc postgres[27546]: [74474-2] STATEMENT:
> SELECT * FROM "asset_user_accesses" WHERE ("asset_user_accesses"."asset_code"
> = 'assignments:course_141208' AND "asset_user_accesses"."user_id" = 618503)
> LIMIT 1;
>
>
> Googling around, it sounds like this is often due to table corruption, which
> would be unfortunate, but usually seems to be repeatable. I can re-run that
> query without issue, and in fact can select * from the entire table without
> issue. I do see the row was updated a few minutes after this error, so is it
> wishful thinking that vacuum came around and successfully removed the old,
> corrupted row version?
It also happens that 18446744073709551613 is -3 in 64-bit 2's complement if it
was unsigned. Is it possible that -3 was some error return code that got cast
and then passed directly to malloc()?
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