Segmentation Faults - SIG 11

[Fabio Luis - Vanguarda TI]

Hi,

In the last month my production firebird server (5.0.3) has crashed six times.

We have two kind of clients connections:
1 - Delphi
2 - Jaybird 4.0.3, 4.0.6, 5.0.6 and 5.0.9 (through Payara application server)

In the core dump it shows json data, that for my (gemini) searches, points me to Jaybird conf_client_info.

{"code":106,"language":"JAVA","version":253,"opaque":1,"flag":0,"remark":"","extFields":null}

In the past I have reported this issue https://github.com/FirebirdSQL/jaybird/issues/735

And for the recent crashes I have reported this issue https://github.com/FirebirdSQL/firebird/issues/8894

Until now I did not update all jaybird clients to the fixed versions of the issue 735.

I would like a shine:

1 - If the jaybird issue (735) could be causing this crash based (8894) on the core dump information;
2 - If so, why now? It's been 3 years since the issue, nothing changes (servers, libs, updates), and the crashes started only one month ago.
3 - If this json is from jaybird, what does this mean? Is it possible to disable it? If so, is that some side effect?

Thanks
Fabio Silva

[Mark Rotteveel]

On 16/02/2026 19:16, Fabio Luis - Vanguarda TI wrote:
> In the last month my production firebird server (5.0.3) has crashed six
> times.
>
> We have two kind of clients connections:
> 1 - Delphi
> 2 - Jaybird 4.0.3, 4.0.6, 5.0.6 and 5.0.9 (through Payara application
> server)
>
> In the core dump it shows json data, that for my (gemini) searches,
> points me to Jaybird conf_client_info.
>
> {"code":106,"language":"JAVA","version":253,"opaque":1,"flag":0,"remark":"","extFields":null}

Jaybird doesn't have anything called conf_client_info. Sounds like a
hallucination from Gemini to me, or a misinterpretation on your part.
I'd think it's sooner application data or something like that.

> In the past I have reported this issue https://github.com/FirebirdSQL/

> jaybird/issues/735 <https://github.com/FirebirdSQL/jaybird/issues/735>

>
> And for the recent crashes I have reported this issue https://

> github.com/FirebirdSQL/firebird/issues/8894 <https://github.com/
> FirebirdSQL/firebird/issues/8894>

>
> Until now I did not update all jaybird clients to the fixed versions of
> the issue 735.
>
> I would like a shine:
>
> 1 - If the jaybird issue (735) could be causing this crash based (8894)
> on the core dump information;

Unless Firebird crashes when a connection terminates due to the SO
timeout and Jaybird terminating the connection, I don't see how issue
735 could be related. Sooner, a connection termination would be due to
the server going away.

Jaybird shouldn't be able to crash Firebird server at all (in an ideal
world; there could be bugs in Firebird that if Jaybird does send
something malformed, could cause Firebird to crash).

In any case, this sounds more like something to ask on firebird-devel.

> 2 - If so, why now? It's been 3 years since the issue, nothing changes
> (servers, libs, updates), and the crashes started only one month ago.

Are you sure nothing changed? I mean, I assume you're applying OS
updates, etc. to keep your server secure. Maybe a change of a low-level
system library is causing this?

> 3 - If this json is from jaybird, what does this mean? Is it possible to
> disable it? If so, is that some side effect?

Jaybird doesn't have any JSON. Nor anything with the fields listed in
that JSON.

--
Mark Rotteveel

[Fabio Luis - Vanguarda TI]

Hi Mark.

I am still investigating, but at the moment I know that the problem came from a network scanner that sends some packages to the 3050 port and crashes the firebird.

I successfully blocked the connections on the firewall, and now I'm trying to catch the exact packages sent to the 3050 port to update the issue 8894.

Thanks for the support ;-) 

Kind Regards

Fabio Silva

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[Mark Rotteveel]

On 06-03-2026 05:19, Fabio Luis - Vanguarda TI wrote:
> I am still investigating, but at the moment I know that the problem came
> from a network scanner that sends some packages to the 3050 port and
> crashes the firebird.
>
> I successfully blocked the connections on the firewall, and now I'm
> trying to catch the exact packages sent to the 3050 port to update the
> issue 8894.
>
> Thanks for the support ;-)

Thanks for the update!

Mark
--
Mark Rotteveel