mORMot Open Source

L_VV

Member

Registered: 2020-10-29

Posts: 38

AV after handling exception in intf.-based service when using TSynLog

I came across an error when using TSynLog and handling exception in the service:

There is a simple Lazarus/FPC console application under Linux, which implements interface-based rest service with one method.

If I add to the application to work with TSynLog

TSynLog.Family.Level := LOG_STACKTRACE + [sllInfo, sllServer];

and if an exception occurs in the service method processing the customer's request, then after correct handling of the exception, another exception (AV) will occur in the astrings.inc file.

If I comment out this line, the second exception does not occurs.

I created the simple reproducible test for this error, but I can not find a reason:
https://drive.google.com/file/d/1wtZEVJ … sp=sharing

Maybe I incorrectly use TSynLog?
But I just took this line from some example, and it works, the log is created.
And for some reason the described problem occurs.

mpv

Member

From: Ukraine

Registered: 2012-03-24

Posts: 1,571

Website

Re: AV after handling exception in intf.-based service when using TSynLog

IMHO Its help a lot if sources will be on github/gitlab as project or gist, this allows to read it from browser. I usually use tablet to read this forum and cant rwad a sample you provide, so cant help

L_VV

Member

Registered: 2020-10-29

Posts: 38

Re: AV after handling exception in intf.-based service when using TSynLog

Yes, I was also uncomfortable to upload files to google.disk 

I created a repository for tests with a project from this topic:

https://github.com/L-VV/fpc_tests.git 

ab

Administrator

From: France

Registered: 2010-06-21

Posts: 14,659

Website

Re: AV after handling exception in intf.-based service when using TSynLog

Which FPC revision are you using?

We currently tested and support FPC 3.2.0.

L_VV

Member

Registered: 2020-10-29

Posts: 38

Re: AV after handling exception in intf.-based service when using TSynLog

I checked this test example on Lazarus/FPC stable.

Yes, indeed, on this version the second exception does not occurs.
Then we can probably skip this error.

Thank you!

L_VV

Member

Registered: 2020-10-29

Posts: 38

Re: AV after handling exception in intf.-based service when using TSynLog

Good morning!

After today's update of mORMot2 to the trunk version, yesterday's second exception no longer occurs on the Lazarus / FPC trunk

Thank you very mach!