Hi, Hugh.

Thank you for your response.

Yesterday evening another virtuoso crashed during the backup set by 
virtuoso inner scheduler with the same error:
....
20:13:12 Backing up page 2930000
20:13:12 page set checksum ck=d368ab6a pck=5368ab6a xor = 80000000
20:13:12 /usr/bin/virtuoso-t() [0xb07467]
....
20:13:12 /usr/bin/virtuoso-t() [0xb15a4c]
20:13:12 /lib/x86_64-linux-gnu/libpthread.so.0(+0x8182) [0x7ff19d613182]
20:13:12 /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7ff19cc1d47d]
20:13:12 GPF: disk.c:298 page set checksum error

Today I run the integrity check as you suggested and it also stopped 
with the following error:
....
07:57:36 Backup to /dev/null started
07:57:36 Dumping the schema tables
07:57:36 Dumping the registry
07:57:36 Dumping the schema done
08:05:05 /usr/bin/virtuoso-t() [0xb07467]
....
08:05:05 /usr/bin/virtuoso-t() [0xb15a4c]
08:05:05 /lib/x86_64-linux-gnu/libpthread.so.0(+0x8182) [0x7fb0752c9182]
08:05:05 /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7fb0748d347d]
08:05:05 GPF: page.c:899 out of order

Suggesting that our virtuoso is corrupt, but making a crash dump is not 
an option for us due to the error in the database after restoring with 
date fields, that I have reported already.
The previous virtuoso-users mail list thread: 
https://www.mail-archive.com/search?l=virtuoso-users@lists.sourceforge.net&q=subject:%22Re%5C%3A+%5C%5BVirtuoso%5C-users%5C%5D+SQL+Error+on+insert+with+virtuoso+7.2.1%22&o=newest.
 
AS I remember I sent a test scenario how I could reproduce it to 
Patrick, but have not gotten any feedback on the matter yet.

The version of virtuoso:
# virtuoso-t -?
Virtuoso Open Source Edition (Column Store) (multi threaded)
Version 7.2.3-dev.3215-pthreads as of Jan 20 2016
Compiled for Linux (x86_64-pc-linux-gnu)
Copyright (C) 1998-2015 OpenLink Software

What can cause the "page.c:899 out of order" corruption, to know how to 
avoid it? We have been using virtuoso for some time without any problems.

Best regards.

Piret

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