armhf: FAIL: TestAntispamFollowerErrorBeforeStream: cannot allocate memory

Hi! I help maintain this for Debian. We got the failure below on armhf. Any ideas?

https://ci.debian.net/packages/g/golang-github-transparency-dev-tessera/testing/armhf/73914012/#L4467

Thanks,
Simon

268s === RUN   TestAntispamFollowerErrorBeforeStream
268s badger 2026/07/29 23:00:39 INFO: All 0 tables opened in 0s
268s badger 2026/07/29 23:00:39 INFO: Discard stats nextEmptySlot: 0
268s badger 2026/07/29 23:00:39 INFO: Set nextTxnTs to 0
268s badger 2026/07/29 23:00:39 ERROR: Received err: Error while creating log file in valueLog.open err: while opening file: /tmp/TestAntispamFollowerErrorBeforeStream2101926875/001/000001.vlog err: cannot allocate memory
268s while mmapping /tmp/TestAntispamFollowerErrorBeforeStream2101926875/001/000001.vlog with size: 2147483646. Cleaning up...
268s     badger_test.go:217: NewAntispam: failed to open badger: During db.vlog.open err: Error while creating log file in valueLog.open err: while opening file: /tmp/TestAntispamFollowerErrorBeforeStream2101926875/001/000001.vlog err: cannot allocate memory
268s         while mmapping /tmp/TestAntispamFollowerErrorBeforeStream2101926875/001/000001.vlog with size: 2147483646
268s --- FAIL: TestAntispamFollowerErrorBeforeStream (0.01s)
268s FAIL
268s FAIL	github.com/transparency-dev/tessera/storage/posix/antispam	4.981s

Start with TestAntispamFollowerErrorBeforeStream and badger_test.go:217, then inspect the Badger setup used by the antispam storage tests. Reproduce the failure from the linked Debian armhf CI run and determine why the test attempts to mmap a 2147483646-byte value log. Done means the test no longer fails from memory allocation on armhf while preserving its intended error-path coverage.