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Re: PosgreSQL is crashing with a signal 11 - Bug?

From: Kjetil Torgrim Homme <kjetilho(at)ifi(dot)uio(dot)no>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: PosgreSQL is crashing with a signal 11 - Bug?
Date: 2004-09-08 20:48:55
Message-ID: 1r656o8p1k.fsf@rovereto.ifi.uio.no (view raw or flat)
Thread:
Lists: pgsql-bugs
[Tom Lane]:
>
>   This evidently corresponds to data starting at offset 0ffc on the
>   disk page (the last few bytes of the gdb output match the start of
>   tuple 43, which is in the next higher part of the page --- note
>   that the bytes are being printed in opposite orders by pg_filedump
>   and gdb).  So somehow, the byte at page offset 0fff got changed
>   from 00 to 2f in memory, though not on disk.

indeed interesting.  IMHO 0x0fff sounds more like a write to -1
(relative to the next page) than a random memory error.

>   If you still have the core dump, would you look at the area
>   surrounding address 3054556648 and see if there are any other
>   discrepancies between that and what is on disk?

I can't see any further discrepancies:

(gdb) x/20 3054556572
0xb610d59c:     0x020c6172      0x00000000      0x00000000      0x00ae0000
0xb610d5ac:     0x0006002c      0x2f1c0913      0x0404b70c      0x0000000c
0xb610d5bc:     0x00000004      0x69480000      0x0000000c      0x00000003
0xb610d5cc:     0x81960000      0x0000000c      0x00000003      0x02100000
0xb610d5dc:     0x0000000c      0x00000002      0x30120000      0x2f00000c

>   0fb0: 72610c02 00000000 00000000 0000ae00  ra..............
>   0fc0: 2c000600 13091c2f 0cb70404 0c000000  ,....../........
>   0fd0: 04000000 00004869 0c000000 03000000  ......Hi........
>   0fe0: 00009681 0c000000 03000000 00001002  ................
>   0ff0: 0c000000 02000000 00001230 0c000000  ...........0....
>   1000: 02000000 00001730                    .......0        

thank you for your tremendous assistance!

-- 
Kjetil T.

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Subject: Re: PosgreSQL is crashing with a signal 11 - Bug?
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