Had commented in T71569 wich was closed nov ´19 my bad.

Can't reproduce on
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: Radeon RX550/550 Series ATI Technologies Inc. 4.5.13586 Core Profile Context 19.12.2 26.20.15002.61

In task manager program is flagged as "not responding" though

@Julian Mohr (Jules) have you tried to wait for a minute?

yes but its unsure to recover: 5 out of 10 times it wont recover.
and ill have to close it
Its really an edge case
maybe its only on my machine but for sure here are more infos:

Have tested also with 2.80 Series starting from 2.80 releases and all will play the animation even tough there is no animation.
It will stuck but not completly hang.

Also had a weird experience with 2.79 where it overjumped the animation completely and finished under a second.
And other times it ran normally.

Im not getting clever out of this Issue

I cannot reproduce the problem in debug mode which makes it quite difficult to investigate what is going on.

I managed to make the daily build hang for a few seconds.
It must be related to the fact that the program is flagged as "not responding".

This is an operator used for benchmark. Therefore, clicking or doing things while it is running can change the result.

I don't know if this operator is really being used for benchmark tests, I think it could be removed.
But the fact that blender is flagged as "not responding" might be worth investigating.

@Germano Cavalcante (mano-wii) I wanted to build an debug build for this issue but "Avira Anivirus" cancelled it and found allegedly an virus should it also been reported to you ?

In T76754#932604, @Julian Mohr (Jules) wrote:

@Germano Cavalcante (mano-wii) I wanted to build an debug build for this issue but "Avira Anivirus" cancelled it and found allegedly an virus should it also been reported to you ?

If I'm not mistaken this is common.
User build and daily build are not signed.

And it is not suitable as a bug report as we don't take build errors as bug reports.

@Julian Mohr (Jules) This is most likely a false positive. Depending on configuration some anti-virus software flags anything for quarantine that isn't whitelisted or doesn't have a known signature. A custom debug build would certainly fall into that category.

Thank you for your explonations @Germano Cavalcante (mano-wii) and @Robert Guetzkow (rjg)

have managed to build the debug build and the result is quite the same with one exception it will recover it self.
10 out of 10 game again and it will get stuck at the second run as soon mouse is clicked it becomes unresponsive but not as unresponsive marked in the task manager.

any guesses or hints where to look at?

Some spectations while playing with this:

All information gathered on first run because it runs smooth

Eevee:
Solid mode time to finish a run avrage 10 secs
Render preview time avrage 4,5 secs

Cyles:
Solid mode 10 secs
Renderpreview cpu 4,7 secs
Render preview gpu 10 secs - no lag or hang - also tested with master because debug build will cancel the render but behavior is the same.

All Animations are the same simple cube and clearly capped to default 24 fps frame rate - default 250 frames long.
Suspicion: frame rate cap is overwriten with 60 fps or uncapped in preview modes. 250/ 60 = 4.16 secs