EncryptionKeyCheck test failure on exfat

[kiburtse]

Expected results

Test pass

Actual Results

test_shared.cpp:2213: ERROR in Shared_EncryptionKeyCheck_3: Unhandled exception after line 2213 realm::InvalidDatabase: Failed to open Realm file at path '...': Realm file decryption failed (Decryption failed)

Steps & Code to Reproduce

Reproduces somewhat often when relevant tests run on exfat fs:

UNITTEST_KEEP_FILES=1 UNITTEST_FILTER=*_EncryptionKey* ./test/realm-tests.app/Contents/MacOS/realm-tests /Volumes/exfat/

CI run with logs but there is nothing other than logged exception

With added logs and additional checks it can be seen where it fails (one such example):

Thread[2]: /Users/user/r/core/test/test_shared.cpp:2197: ERROR in Shared_EncryptionKeyCheck: CHECK_NOTHROW(db = DB::create(path, false, DBOptions(crypt_key(true)))) failed: Did throw realm::InvalidDatabase: Failed to open Realm file at path '/Volumes/SD8/tmp/Shared_EncryptionKeyCheck.1.path.realm': Realm file decryption failed (Decryption failed: 'refresh_page failed: 18, 0, , 16384, 0, 24')                     
Thread[2]: /Users/user/r/core/test/test_shared.cpp:2198: ERROR in Shared_EncryptionKeyCheck: CHECK(db) failed
Thread[2]: /Users/user/r/core/test/test_shared.cpp:2200: ERROR in Shared_EncryptionKeyCheck: CHECK_NOTHROW(db = DB::create(path, false, DBOptions(crypt_key(true)))) failed: Did throw realm::InvalidDatabase: Failed to open Realm file at path '/Volumes/SD8/tmp/Shared_EncryptionKeyCheck.1.path.realm': Realm file decryption failed (Decryption failed: 'refresh_page failed: 8, 0, , 16384, 0, 24')                      
Thread[2]: /Users/user/r/core/test/test_shared.cpp:2201: ERROR in Shared_EncryptionKeyCheck: CHECK(db) failed
FAILURE: 1 out of 3 tests failed (4 out of 15 checks failed).
Test time: 132.56ms
Note: 1576 tests were excluded!

Top 3 time usage:
-------------------------------------
Shared_EncryptionKeyCheck    132.48ms
Shared_EncryptionKeyCheck_3   18.28ms
Shared_EncryptionKeyCheck_2   18.28ms

All three relevant test should run concurrently to trigger the issue from what i can tell. Resulting realm files will be invalid and can't be read after such failure: realm-trawler will report the same DecryptionFailed error. I suspect it's the same type of issue as here #6959 since encrypted mapping also uses file uids.

Core version

Core version: 13.23.4

[kiburtse]

@ironage does this look like the same cause to you? If this fails on 0 >= 24, that means that the block wasn't written on encrypted page at all?