Possible dead lock.

[Slewrate]

Hi!

Every now and then (several times per day) my website stops responding and I get this error on OLS error log:

No request delivery notification has been received from LSAPI application, possible dead lock.

Any ideas where to look for more info?

Thanks
Alex

 

[Cold-Egg]

Check the error and stderr logs and see if there's any idle or hitting max PHP connection limit issues.

 

[Slewrate]

strerr logs only contains:

2024-12-02 10:01:18.800 [STDERR] sh: 1: /usr/sbin/sendmail: not found

The error log does not seem to contain php connection limit logs. Only this:

No request delivery notification has been received from LSAPI application, possible dead lock.

 

[Slewrate]

It seems that this is related to mariaDB.
when this happens, there are alot of mariaDB instances spanning and CPU load gets high.

 

[Cold-Egg]

If it's due to some spike traffic and the server does not have enough resources to handle it, then you could try to check the access log and mitigate it.

 

[Slewrate]

If it's due to some spike traffic and the server does not have enough resources to handle it, then you could try to check the access log and mitigate it.

Hi, no. This is not the case. This can happen any time, even when traffic is low, and the server resources are much more than enough.

This issue drives me crazy. It's very similar to this thread.
I thought it was a mariaDB issue but I'm not sure.

Are they are other OLS logs that I can check?