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Re: space reserved for WAL record does not match what was written: panic on windows - Mailing list pgsql-hackers

From David Rowley
Subject Re: space reserved for WAL record does not match what was written: panic on windows
Date
Msg-id CAApHDvqhWEezyzv-C8Z2COtPMh56NfK_JVvyK5mi2m0pGfhDww@mail.gmail.com
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In response to Re: space reserved for WAL record does not match what was written: panic on windows  (Andres Freund <andres@2ndquadrant.com>)
Responses Re: space reserved for WAL record does not match what was written: panic on windows  (David Rowley <dgrowleyml@gmail.com>)
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On Sat, Oct 5, 2013 at 1:19 AM, Andres Freund <andres@2ndquadrant.com> wrote:
On 2013-10-05 01:05:37 +1300, David Rowley wrote:
> In HEAD of 9.4 I'm getting the following:
>
> D:\9.4\bin>postgres.exe -D d:\9.4\data
> LOG:  database system was shut down at 2013-10-05 00:43:33 NZDT
> LOG:  database system is ready to accept connections
> LOG:  autovacuum launcher started
> PANIC:  space reserved for WAL record does not match what was written:
> CurrPos = 18446744071562067968 EndPos = 2147483648

Could it be that MAXALIGN/TYPEALIGN doesn't really work for values
bigger than 32bit?

#define MAXALIGN(LEN)                   TYPEALIGN(MAXIMUM_ALIGNOF, (LEN))
#define TYPEALIGN(ALIGNVAL,LEN)  \
        (((intptr_t) (LEN) + ((ALIGNVAL) - 1)) & ~((intptr_t) ((ALIGNVAL) - 1)))


It looks that way.

As a quick test I put some printf's around where the MAXALIGN is used:

/* Align the end position, so that the next record starts aligned */
printf("CurrPos == %llu (before MAXALIGN)\n", CurrPos);
CurrPos = MAXALIGN(CurrPos);
printf("CurrPos == %llu (after MAXALIGN)\n", CurrPos);

I got the following just before the PANIC.

CurrPos == 2147483711 (before MAXALIGN)
CurrPos == 18446744071562068032 (after MAXALIGN)
 
Regards

David

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