The search freezes without apparent reason

[mooskagh]

This was reported in discord, https://discord.com/channels/425419482568196106/427066771627966466/867772646358515742

The search suddenly stops making progress.
Couple of unusual settings (which may or may not be the reason):

• Search is started with go nodes 5000000 (rather than in timed or infinite mode)
• MultiPV is set to 99
• Other options:

setoption name WeightsFile value /home/michael/lc0/nets/current_net
setoption name BackendOptions value custom_winograd=false
setoption name CPuct value 1.745
setoption name CPuctBase value 38739
setoption name CPuctFactor value 3.894
setoption name FpuValue value 0.33
setoption name MaxCollisionVisits value 1000
setoption name MovesLeftMaxEffect value 0.2
setoption name MovesLeftThreshold value 0.0
setoption name MovesLeftSlope value 0.007
setoption name MovesLeftConstantFactor value 0.0
setoption name MovesLeftScaledFactor value 1.0
setoption name MovesLeftQuadraticFactor value 0.0
setoption name Ponder value false
setoption name MultiPV value 99

• Version: latest master, v0.29.0-dev+git.ea08545 built Jul 11 2021
• Backend: cudnn
• GPU: GTX 960, 2GB

There is a warning:

CUDA Runtime version: 11.4.0
WARNING: CUDA Runtime version mismatch, was compiled with version 11.3.0

Log file: leela_log.txt

[Naphthalin]

Did we ever find the source of this bug?