new version of ncbi-blast+ causes autopkgtest hangs

[Steve Langasek]

After updating ncbi-blast+ to 2.11.0 in proposed, both cct and kleborate autopkgtests fail with timeouts. cct hangs consistently at the same place:

[...]
Warning: [tblastn] The parameter -num_descriptions is ignored for output formats > 4 . Use -max_target_seqs to control output
Performing BLAST search for sequence number 105 (orf_105_start=12818;end=12904;strand=1;rf=2).
Warning: [tblastn] The parameter -num_descriptions is ignored for output formats > 4 . Use -max_target_seqs to control output
autopkgtest [15:16:05]: ERROR: timed out on command [...]

This is not trivially reproducible by running the autopkgtest locally. Perhaps this is only reproducible in memory-restricted environments.

[Steve Langasek (vorlon)]

I was unable to reproduce this failure on a memory-restricted arm64 VM in canonistack.

[Jeremy Bícha (jbicha)]

This appears to no longer be reproducible

https://autopkgtest.ubuntu.com/packages/cct
https://autopkgtest.ubuntu.com/packages/kleborate