"Estimated fee out of range" intermittent failure in feature_fee_estimation.py #25179
Description
https://cirrus-ci.com/task/4707498732027904 on [nowallet libbitcoinkernel] [bionic]
node1 2022-05-20T14:25:48.635128Z [httpworker.3] [policy/fees.cpp:365] [EstimateMedianVal] FeeEst: 1 > 95% decay 0.99520: feerate: 307809 from (301403 - 348912) 100.00% 34.4/(34.4 0 mem 0.0 out) Fail: (247965 - 301403) 86.60% 32.3/(32.3 5 mem 0.0 out)
node1 2022-05-20T14:25:48.635669Z [httpworker.3] [policy/fees.cpp:365] [EstimateMedianVal] FeeEst: 1 > 95% decay 0.99931: feerate: 732088 from (515502 - 1e+99) 100.00% 156.5/(156.5 0 mem 0.0 out) Fail: (247965 - 515502) 93.92% 154.6/(154.6 10 mem 0.0 out)
test 2022-05-20T14:25:48.638000Z TestFramework (ERROR): Assertion failed
Traceback (most recent call last):
File "/tmp/cirrus-ci-build/ci/scratch/build/bitcoin-x86_64-pc-linux-gnu/test/functional/test_framework/test_framework.py", line 133, in main
self.run_test()
File "/tmp/cirrus-ci-build/ci/scratch/build/bitcoin-x86_64-pc-linux-gnu/test/functional/feature_fee_estimation.py", line 297, in run_test
self.sanity_check_estimates_range()
File "/tmp/cirrus-ci-build/ci/scratch/build/bitcoin-x86_64-pc-linux-gnu/test/functional/feature_fee_estimation.py", line 205, in sanity_check_estimates_range
check_estimates(self.nodes[1], self.fees_per_kb)
File "/tmp/cirrus-ci-build/ci/scratch/build/bitcoin-x86_64-pc-linux-gnu/test/functional/feature_fee_estimation.py", line 114, in check_estimates
check_raw_estimates(node, fees_seen)
File "/tmp/cirrus-ci-build/ci/scratch/build/bitcoin-x86_64-pc-linux-gnu/test/functional/feature_fee_estimation.py", line 79, in check_raw_estimates
f"Estimated fee ({feerate}) out of range ({min(fees_seen)},{max(fees_seen)})"
AssertionError: Estimated fee (0.00732088) out of range (3.9370078740157485e-05,0.007271477272727272)
test 2022-05-20T14:25:48.639000Z TestFramework (DEBUG): Closing down network thread
test 2022-05-20T14:25:48.690000Z TestFramework (INFO): Stopping nodes
test 2022-05-20T14:25:48.690000Z TestFramework.node0 (DEBUG): Stopping node I initially thought this might be the same as #23165 (and #11800 and #20725) that return Estimated fee (a) larger than last fee (b) for lower number of confirms.
But this one is Estimated fee out of range, so opening this issue and linking to the other ones.