Hi!
Our Virtuoso has been crashing for the last few months constantly (after 2-8 hours). The error is always segmentation fault. An extract of `/var/log/kern.log` is below

```
Nov  1 15:42:51 virtuoso kernel: [1295132.159079] virtuoso-t[6661]: segfault at 70 ip 00000000006891f9 sp 00007fb1c7923bb0 error 4 in virtuoso-t[400000+df3000]
Nov  1 20:00:31 virtuoso kernel: [1310591.247369] virtuoso-t[24645]: segfault at 70 ip 00000000006891f9 sp 00007f0f14836bb0 error 4 in virtuoso-t[400000+df3000]
Nov  2 19:23:31 virtuoso kernel: [1394769.846640] virtuoso-t[28091]: segfault at 70 ip 00000000006891f9 sp 00007f5ae4b78bb0 error 4 in virtuoso-t[400000+df3000]
Nov  2 20:23:28 virtuoso kernel: [1398366.479007] virtuoso-t[8756]: segfault at 70 ip 00000000006891f9 sp 00007fcfa4b98bb0 error 4 in virtuoso-t[400000+df3000]
Nov  2 23:12:51 virtuoso kernel: [1408528.783002] virtuoso-t[20164]: segfault at 70 ip 00000000006891f9 sp 00007f85f780dbb0 error 4 in virtuoso-t[400000+df3000]
Nov  3 07:04:01 virtuoso kernel: [1436798.537446] virtuoso-t[15692]: segfault at 70 ip 00000000006891f9 sp 00007fcc9d29abb0 error 4 in virtuoso-t[400000+df3000]
Nov  3 13:00:29 virtuoso kernel: [1458185.606298] virtuoso-t[20063]: segfault at 70 ip 00000000006891f9 sp 00007ff15e01fbb0 error 4 in virtuoso-t[400000+df3000]
```

* First I thought it was something about some heavy queries we were running, so I enabled `HTTPLogFile` in virtuoso `ini`, so i am getting now logs. However, there is nothing related to queries and the crashing
* So, we thought it may be file system, so we created a new Virtual Machine, and copied Virtuoso and database. Result was the same. Virtuoso crashed after started using it.
* Since we are running old version (Virtuoso 7.2.6-dev) I thought it will be good to migrate to the latest Virtuoso (7.2.11) but I thought It would good opportunity to migrate the database into the new format supported by 7.2.7+, which uses 64-bit prefix IDs in `RDF_IRI`. But in order to do that, I was trying to follow migration [option 1](https://github.com/openlink/virtuoso-opensource/blob/develop/7/README.UPGRADE.md#upgrade-method-1) . That means I need to make a dump of whole database using the `RDF_DUMP_NQUADS()` procedure. The problem however, is that i start the procedure, but Virtuoso always crashes somewhere in the middle, so I cannot make the Dump. 

So, the question is what should I do? Should I try copying the existing database in the new Virtuoso 7.2.11, and then try migration [option 2](https://github.com/openlink/virtuoso-opensource/blob/develop/7/README.UPGRADE.md#upgrade-method-2)?

Any other help you can provide?

Details of current Virtuoso
**endpoint**: https://www.foodie-cloud.org/sparql 
**version**: `7.2.6-dev`
**database size**: 265 GB
**`Virtuoso.ini` attached** (renamed to `virtuoso.txt`)
[`virtuoso.txt`](https://github.com/openlink/virtuoso-opensource/files/13250049/virtuoso.txt)

Virtuoso crashing - migration options
This is a GitHub Issue
repo:virtuoso-opensource
owner:openlink
Title : Virtuoso crashing - migration options
Issue date:

--- start body ---
Hi!
Our Virtuoso has been crashing for the last few months constantly (after 2-8 hours). The error is always segmentation fault. An extract of `/var/log/kern.log` is below

```
Nov  1 15:42:51 virtuoso kernel: [1295132.159079] virtuoso-t[6661]: segfault at 70 ip 00000000006891f9 sp 00007fb1c7923bb0 error 4 in virtuoso-t[400000+df3000]
Nov  1 20:00:31 virtuoso kernel: [1310591.247369] virtuoso-t[24645]: segfault at 70 ip 00000000006891f9 sp 00007f0f14836bb0 error 4 in virtuoso-t[400000+df3000]
Nov  2 19:23:31 virtuoso kernel: [1394769.846640] virtuoso-t[28091]: segfault at 70 ip 00000000006891f9 sp 00007f5ae4b78bb0 error 4 in virtuoso-t[400000+df3000]
Nov  2 20:23:28 virtuoso kernel: [1398366.479007] virtuoso-t[8756]: segfault at 70 ip 00000000006891f9 sp 00007fcfa4b98bb0 error 4 in virtuoso-t[400000+df3000]
Nov  2 23:12:51 virtuoso kernel: [1408528.783002] virtuoso-t[20164]: segfault at 70 ip 00000000006891f9 sp 00007f85f780dbb0 error 4 in virtuoso-t[400000+df3000]
Nov  3 07:04:01 virtuoso kernel: [1436798.537446] virtuoso-t[15692]: segfault at 70 ip 00000000006891f9 sp 00007fcc9d29abb0 error 4 in virtuoso-t[400000+df3000]
Nov  3 13:00:29 virtuoso kernel: [1458185.606298] virtuoso-t[20063]: segfault at 70 ip 00000000006891f9 sp 00007ff15e01fbb0 error 4 in virtuoso-t[400000+df3000]
```

* First I thought it was something about some heavy queries we were running, so I enabled `HTTPLogFile` in virtuoso `ini`, so i am getting now logs. However, there is nothing related to queries and the crashing
* So, we thought it may be file system, so we created a new Virtual Machine, and copied Virtuoso and database. Result was the same. Virtuoso crashed after started using it.
* Since we are running old version (Virtuoso 7.2.6-dev) I thought it will be good to migrate to the latest Virtuoso (7.2.11) but I thought It would good opportunity to migrate the database into the new format supported by 7.2.7+, which uses 64-bit prefix IDs in `RDF_IRI`. But in order to do that, I was trying to follow migration [option 1](https://github.com/openlink/virtuoso-opensource/blob/develop/7/README.UPGRADE.md#upgrade-method-1) . That means I need to make a dump of whole database using the `RDF_DUMP_NQUADS()` procedure. The problem however, is that i start the procedure, but Virtuoso always crashes somewhere in the middle, so I cannot make the Dump. 

So, the question is what should I do? Should I try copying the existing database in the new Virtuoso 7.2.11, and then try migration [option 2](https://github.com/openlink/virtuoso-opensource/blob/develop/7/README.UPGRADE.md#upgrade-method-2)?

Any other help you can provide?

Details of current Virtuoso
**endpoint**: https://www.foodie-cloud.org/sparql 
**version**: `7.2.6-dev`
**database size**: 265 GB
**`Virtuoso.ini` attached** (renamed to `virtuoso.txt`)
[`virtuoso.txt`](https://github.com/openlink/virtuoso-opensource/files/13250049/virtuoso.txt)

--- end body ---
