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Type: Bug
Resolution: Cannot Reproduce
Priority: Unknown
Fix Version/s: None
Affects Version/s: None
Component/s: None
Labels:

Github URL:
https://github.com/realm/realm-core/issues/3134
GitHub#:
3134

We are seeing a number of crash reports on the Java side that indicates the Realm file is somehow being corrupted. It is still unclear why this is happening, but the errors all have the same form but with different values:

Fatal Exception: io.realm.exceptions.RealmFileException: Unable to open a realm at path '/data/data/com.test/files/userdb.realm': Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 623E3EBB12044142, mnemonic: A7 8C EE A, fmt[0]: 160, fmt[1]: 49, flags: D7. (Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 623E3EBB12044142, mnemonic: A7 8C EE A, fmt[0]: 160, fmt[1]: 49, flags: D7) (/data/data/com.test/files/userdb.realm) in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 101

References to Java issues:

Current observations:

We can still not rule out completely this is happening due to the files being manipulated by code outside Realm's control, e.g. end app users users deleting or moving files or backup/restore procedures overwritting files.
There are few (if any) reports of this happening on other platforms which either indicates a general problem in the Java binding or the Android kernel.
It is happening across a wide variety of Android devices and versions indicating the problem is on our side.
This crash is seen together with https://github.com/realm/realm-core/issues/3133. One observation is that this crash only seems to happen for the userdb.realm while #3133 only happens for the librarydb.realm. This could indicate these files are somehow being handled differently as they seem to become corrupted in different ways. I'm trying to verify this.

Known devices that has experienced this error:

Galaxy Grand Prime
Galaxy J1
Galaxy Note3 Neo
Mate 7
Moto G (5S) Plus
Redmi Note 4
SM-J400F
SM-G611MT

Crash data:

A list of exceptions and devices it is happening on can be seen here:

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Searching 66 files for "(# OS Version(.|\n)*?)(^Fatal Exception:.*Invalid mnemonic.*)" (regex)

/Users/cm/Downloads/User Realm Crashes/com.test_issue_2727_crash_5BABA50602E90001659D11678B8E9F44_DNE_0_v2.txt:
   11  # Date: 2018-09-26T15:25:00Z
   12: # OS Version: 8.1.0
   13: # Device: Moto G (5S) Plus
   14: # RAM Free: 54.5%
   15: # Disk Free: 75.6%
   16: 
   17: 
   18: Fatal Exception: java.lang.RuntimeException: Unable to create application com.test.MainApplication: io.realm.exceptions.RealmFileException: Unable to open a realm at path '/data/data/com.test/files/userdb.realm': Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 6D9515BB3A044142, mnemonic: 50 F0 D2 A9, fmt[0]: 58, fmt[1]: 174, flags: 30. (Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 6D9515BB3A044142, mnemonic: 50 F0 D2 A9, fmt[0]: 58, fmt[1]: 174, flags: 30) (/data/data/com.test/files/userdb.realm) in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 101 Kind: ACCESS_ERROR.

/Users/cm/Downloads/User Realm Crashes/com.test_issue_2727_crash_5BAC04C9037F00017A589B5172E1E4A0_DNE_0_v2.txt:
   11  # Date: 2018-09-26T21:50:08Z
   12: # OS Version: 5.1.1
   13: # Device: Galaxy Note3 Neo
   14: # RAM Free: 17.6%
   15: # Disk Free: 3.5%
   16: 
   17: 
   18: Fatal Exception: io.realm.exceptions.RealmFileException: Unable to open a realm at path '/data/data/com.test/files/userdb.realm': Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 623E3EBB12044142, mnemonic: A7 8C EE A, fmt[0]: 160, fmt[1]: 49, flags: D7. (Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 623E3EBB12044142, mnemonic: A7 8C EE A, fmt[0]: 160, fmt[1]: 49, flags: D7) (/data/data/com.test/files/userdb.realm) in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 101

/Users/cm/Downloads/User Realm Crashes/com.test_issue_2727_crash_5BB30FB001BF00010F7711678B8E9F44_DNE_0_v2.txt:
   11  # Date: 2018-10-02T06:26:00Z
   12: # OS Version: 8.1.0
   13: # Device: Moto G (5S) Plus
   14: # RAM Free: 49.6%
   15: # Disk Free: 71.6%
   16: 
   17: 
   18: Fatal Exception: java.lang.RuntimeException: Unable to create application com.test.MainApplication: io.realm.exceptions.RealmFileException: Unable to open a realm at path '/data/data/com.test/files/userdb.realm': Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 6D9515BB3A044142, mnemonic: 50 F0 D2 A9, fmt[0]: 58, fmt[1]: 174, flags: 30. (Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 6D9515BB3A044142, mnemonic: 50 F0 D2 A9, fmt[0]: 58, fmt[1]: 174, flags: 30) (/data/data/com.test/files/userdb.realm) in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 101 Kind: ACCESS_ERROR.

/Users/cm/Downloads/User Realm Crashes/com.test_issue_2727_crash_5BBFB19D03B3000172D76B2E4A0B9596_DNE_0_v2.txt:
   11  # Date: 2018-10-11T20:25:00Z
   12: # OS Version: 5.1.1
   13: # Device: Mate 7
   14: # RAM Free: 41.4%
   15: # Disk Free: 18.8%
   16: 
   17: 
   18: Fatal Exception: java.lang.RuntimeException: Unable to create application com.test.MainApplication: io.realm.exceptions.RealmFileException: Unable to open a realm at path '/data/data/com.test/files/userdb.realm': Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 9AF3F63B74044142, mnemonic: 26 5A 98 D, fmt[0]: 195, fmt[1]: 51, flags: 9F. (Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 9AF3F63B74044142, mnemonic: 26 5A 98 D, fmt[0]: 195, fmt[1]: 51, flags: 9F) (/data/data/com.test/files/userdb.realm) in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 101 Kind: ACCESS_ERROR.

/Users/cm/Downloads/User Realm Crashes/com.test_issue_2727_crash_5BC5AD7902FA00015EA2A8B0ED677417_DNE_0_v2.txt:
   11  # Date: 2018-10-16T09:20:00Z
   12: # OS Version: 8.0.0
   13: # Device: SM-J400F
   14: # RAM Free: 23.7%
   15: # Disk Free: 67.4%
   16: 
   17: 
   18: Fatal Exception: java.lang.RuntimeException: Unable to create application com.test.MainApplication: io.realm.exceptions.RealmFileException: Unable to open a realm at path '/data/data/com.test/files/userdb.realm': Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 6841387164044142, mnemonic: 88 54 B0 9E, fmt[0]: 15, fmt[1]: 65, flags: 1B. (Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 6841387164044142, mnemonic: 88 54 B0 9E, fmt[0]: 15, fmt[1]: 65, flags: 1B) (/data/data/com.test/files/userdb.realm) in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 101 Kind: ACCESS_ERROR.

/Users/cm/Downloads/User Realm Crashes/com.test_issue_2727_crash_5BC5B8DB038800013B7DA8B0ED677417_DNE_0_v2.txt:
   11  # Date: 2018-10-16T10:09:00Z
   12: # OS Version: 8.0.0
   13: # Device: SM-J400F
   14: # RAM Free: 35.9%
   15: # Disk Free: 68.8%
   16: 
   17: 
   18: Fatal Exception: java.lang.RuntimeException: Unable to create application com.test.MainApplication: io.realm.exceptions.RealmFileException: Unable to open a realm at path '/data/data/com.test/files/userdb.realm': Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 6841387164044142, mnemonic: 88 54 B0 9E, fmt[0]: 15, fmt[1]: 65, flags: 1B. (Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 6841387164044142, mnemonic: 88 54 B0 9E, fmt[0]: 15, fmt[1]: 65, flags: 1B) (/data/data/com.test/files/userdb.realm) in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 101 Kind: ACCESS_ERROR.

/Users/cm/Downloads/User Realm Crashes/com.test_issue_2727_crash_5BC617EC039000017784A8B0ED677417_DNE_0_v2.txt:
   11  # Date: 2018-10-16T16:55:00Z
   12: # OS Version: 8.0.0
   13: # Device: SM-J400F
   14: # RAM Free: 30.7%
   15: # Disk Free: 68.4%
   16: 
   17: 
   18: Fatal Exception: java.lang.RuntimeException: Unable to create application com.test.MainApplication: io.realm.exceptions.RealmFileException: Unable to open a realm at path '/data/data/com.test/files/userdb.realm': Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 6841387164044142, mnemonic: 88 54 B0 9E, fmt[0]: 15, fmt[1]: 65, flags: 1B. (Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 6841387164044142, mnemonic: 88 54 B0 9E, fmt[0]: 15, fmt[1]: 65, flags: 1B) (/data/data/com.test/files/userdb.realm) in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 101 Kind: ACCESS_ERROR.

/Users/cm/Downloads/User Realm Crashes/com.test_issue_2727_crash_5BC7AFEB03E100014B1CBE206EDC8208_DNE_0_v2.txt:
   11  # Date: 2018-10-17T21:55:50Z
   12: # OS Version: 8.0.0
   13: # Device: SM-G611MT
   14: # RAM Free: 26.2%
   15: # Disk Free: 62.3%
   16: 
   17: 
   18: Fatal Exception: java.lang.RuntimeException: Unable to create application com.test.MainApplication: io.realm.exceptions.RealmFileException: Unable to open a realm at path '/data/data/com.test/files/userdb.realm': Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: F107DDE3F1044142, mnemonic: 8A 76 9C BC, fmt[0]: 182, fmt[1]: 246, flags: D1. (Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: F107DDE3F1044142, mnemonic: 8A 76 9C BC, fmt[0]: 182, fmt[1]: 246, flags: D1) (/data/data/com.test/files/userdb.realm) in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 101 Kind: ACCESS_ERROR.

/Users/cm/Downloads/User Realm Crashes/com.test_issue_2727_crash_5BCAA37201E8000118B353A4AF9E1966_DNE_0_v2.txt:
   11  # Date: 2018-10-20T03:39:00Z
   12: # OS Version: 5.0.2
   13: # Device: Galaxy Grand Prime
   14: # RAM Free: 36.7%
   15: # Disk Free: 23.2%
   16: 
   17: 
   18: Fatal Exception: java.lang.RuntimeException: Unable to create application com.test.MainApplication: io.realm.exceptions.RealmFileException: Unable to open a realm at path '/data/data/com.test/files/userdb.realm': Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: DDFE0CDD21044142, mnemonic: 6D 6A 23 E3, fmt[0]: 79, fmt[1]: 228, flags: BB. (Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: DDFE0CDD21044142, mnemonic: 6D 6A 23 E3, fmt[0]: 79, fmt[1]: 228, flags: BB) (/data/data/com.test/files/userdb.realm) in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 101 Kind: ACCESS_ERROR.

/Users/cm/Downloads/User Realm Crashes/com.test_issue_2727_crash_5BD5C91F014E0001452D672A97D5E137_DNE_0_v2.txt:
   11  # Date: 2018-10-28T14:35:00Z
   12: # OS Version: 6.0.1
   13: # Device: Galaxy J1
   14: # RAM Free: 41.5%
   15: # Disk Free: 6.6%
   16: 
   17: 
   18: Fatal Exception: java.lang.RuntimeException: Unable to create application com.test.MainApplication: io.realm.exceptions.RealmFileException: Unable to open a realm at path '/data/data/com.test/files/userdb.realm': Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 8DB56480F044142, mnemonic: C7 C7 2 58, fmt[0]: 160, fmt[1]: 169, flags: AB. (Invalid mnemonic. top_ref[0]: 104600030316, top_ref[1]: 8DB56480F044142, mnemonic: C7 C7 2 58, fmt[0]: 160, fmt[1]: 169, flags: AB) (/data/data/com.test/files/userdb.realm) in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 101 Kind: ACCESS_ERROR.

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