slow/process/callbacks on Android often quits with error but no message

There is an intermittent but frequent problem when running the test on Android in GitLab CI. test-slow quits with an error but outputs no message: https://gitlab.com/eighthave/tor-android/-/jobs/1905373288

$ adb -e shell "cd /data/local/tmp; ./$f"'; echo -n $? > '"$f.result";
test-slow
external/test/x86_64/test-slow: 1 file pushed, 0 skipped. 26.3 MB/s (8254824 bytes in 0.299s)
WARNING: linker: ./test-slow: unused DT entry: type 0x6ffffef5 arg 0x8bf18
WARNING: linker: ./test-slow: unused DT entry: type 0x6ffffffe arg 0xbb56c
WARNING: linker: ./test-slow: unused DT entry: type 0x6fffffff arg 0x2
slow/crypto/s2k_rfc2440: OK
slow/crypto/s2k_pbkdf2: OK
slow/crypto/s2k_rfc2440_general: OK
slow/crypto/s2k_rfc2440_legacy: OK
slow/crypto/s2k_errors: OK
slow/crypto/scrypt_vectors: SKIPPED
slow/crypto/pbkdf2_vectors: OK
slow/crypto/pwbox: OK
slow/crypto/fuzz_donna/ed25519_donna: [forking] OK
slow/crypto/fuzz_donna/ed25519_ref10: [forking] OK
slow/process/callbacks:
$