Segmentation fault on triples insertion

[Hibou57]

I started RedStore using:

redstore -s file foo.rdf -p 61002

Then in the web interface I tried to insert some test triples:

@prefix: <foo/> .
:a1 :b1 "C1" .
:a2 :b2 "C2" .

… using Turtle for the syntax and “bar” for the base URI. When I clicked “Send”, the browser told me the connexion was reinitialised, and in the terminal within which I started RedStore, there was this message:

[1] 6508 segmentation fault (core dumped) redstore -s file foo.rdf -p 61002

This is not random, this always happens each time I retry the same. I’ve set ulimit -c to unlimited to get a core‑dump file, but it’s big (620K) so I don’t know if it’s OK to attach it here.

If this can help, uname -a says:

Linux XXX 3.13.0-129-generic #178-Ubuntu SMP Fri Aug 11 12:49:13 UTC 2017 i686 i686 i686 GNU/Linux

[Hibou57]

With a different use‑case, I got a crash with this additional message:

redstore: headers.c:54: redhttp_headers_add: Assertion `strlen(key) > 0' failed.

[Hibou57]

For the one above, I could figure the cause. That’s because I did this from another terminal:

curl 'http://localhost:61002/data?&format=rdfxml'

Instead of:

curl 'http://localhost:61002/data?default&format=rdfxml'

[njh]

It is not immediately obvious to me why RedStore is crashing. What you are attempting to do looks reasonable.

It is useful to check to see if this is a RedStore problem or a Redland problem but attempting to do the same thing using rdfproc.

Be warned that there also hasn't been a release of Redland since 2013.

nick.

[Hibou57]

One segmentation fault was preceded by an interesting message:

[WARNING] Sat Sep 2 21:41:18 2017 Model does not support contexts [1] 28458 segmentation fault (core dumped) redstore -s file foo.rdf -p 61002

The preceding warning message may be worth to note.

— Edit — More than one time, it was always there, I just have not noticed before (shy).

[Hibou57]

I can’t reproduce the crash with rdfproc:

rdfproc -s file foo.rdf add 'foo/a1' 'foo/b1' '"C1"'

… works

It fails with RedStore only and RedStore does not crash if I use -n -s sqlite foo.db instead of -s file foo.rdf. Since SQLite store provides context and RDF file store does not, and there is this warning message (mentioned before), this must be related to context (unfortunately, I don’t know about RDF context).

May be it expects something somewhere, tries to access this non‑existing thing and then segfault.

[jonassmedegaard]

README.md explicitly states that "You can use any of the Redland Storage Modules that supports contexts"