Magnus Hagander <> writes:
> On Tue, Oct 18, 2016 at 1:00 AM, Vladimir Sitnikov <
>> wrote:
>> The test executes "select pg_sleep(10)" and tries to cancel it. In recent
>> master builds, cancel seems to be ignored, and the statement lasts for 10
>> seconds.

> My guess is it's related to this:
> That's certainly not intended to break things, but that was changed on Oct
> 17 and it relates to cancel keys.
> What platform does the postgres server run on? Can can you check if query
> cancel works on libpq or if it's completely broken?

I can confirm that query cancel is broken in HEAD on RHEL6.

regression=# select pg_sleep(10);
^CCancel request sent
... nothing happens for the balance of the 10 seconds ...

There's a smoking gun in the postmaster log:

2016-10-18 09:10:34.547 EDT [18502] LOG:  wrong key in cancel request for 
process 18491

                        regards, tom lane

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