Out of memory issue

[ankursharma234]

Actual Results

Caused by io.realm.exceptions.RealmError: Unrecoverable error. mmap() failed: Out of memory size: 671088640 in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 101
at io.realm.internal.OsSharedRealm.nativeGetSharedRealm(OsSharedRealm.java)
at io.realm.internal.OsSharedRealm.(OsSharedRealm.java:171)
at io.realm.internal.OsSharedRealm.getInstance(OsSharedRealm.java:241)
at io.realm.internal.OsSharedRealm.getInstance(OsSharedRealm.java:231)
at io.realm.RealmCache.doCreateRealmOrGetFromCache(RealmCache.java:319)
at io.realm.RealmCache.createRealmOrGetFromCache(RealmCache.java:282)
at io.realm.Realm.getInstance(Realm.java:378)
at in.bizanalyst.utils.RealmUtils.getRealm(RealmUtils.java:65)
at in.bizanalyst.async.OrderPendingCalculation.doInBackground(OrderPendingCalculation.java:443)
at in.bizanalyst.async.OrderPendingCalculation.doInBackground(OrderPendingCalculation.java:46)
at android.os.AsyncTask$2.call(AsyncTask.java:333)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
at java.lang.Thread.run(Thread.java:764)

Steps & Code to Reproduce

Not reproducible on my side

Version of Realm and tooling

Realm version(s): 5.4.1

Realm Sync feature enabled: Yes

Android Studio version: Yes

Android Build Tools version: 27.0.3

Gradle version: 3.4.1

Which Android version and device(s): All

[Zhuinden]

Does it make sense for your Realm file to be 6 GB? Do you store that much data?

[mehulsutariya]

@Zhuinden It is about 640MB and yes our realm files do go up to 1GB in certain cases. Can that be a problem?

[Zhuinden]

Actually it really does say 640 MB.

Is this on a device that has less than 1 GB RAM?

[mehulsutariya]

Here are couple of the devices on which we have seen the error:

Samsung J7: 3 GB RAM
Samsung Galaxy A9: 4GB RAM (https://www.samsung.com/in/smartphones/galaxy-a9-a910f/)

Additionally, we have also go an error like this on one of the devices and am not sure if they are related.

Unable to open a realm at path '/data/data/': Top ref outside file (size = 268484608). top_ref[0]: FF50828, top_ref[1]: 100473C0, mnemonic: 54 2D 44 42, fmt[0]: 9, fmt[1]: 9, flags: 1. (Top ref outside file (size = 268484608). top_ref[0]: FF50828, top_ref[1]: 100473C0, mnemonic: 54 2D 44 42, fmt[0]: 9, fmt[1]: 9, flags: 1) (/data/data/) in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 101

io.realm.internal.OsSharedRealm.nativeGetSharedRealm (OsSharedRealm.java)

  | io.realm.internal.OsSharedRealm. (OsSharedRealm.java:171)
  | io.realm.internal.OsSharedRealm.getInstance (OsSharedRealm.java:241)
  | io.realm.internal.OsSharedRealm.getInstance (OsSharedRealm.java:231)
  | io.realm.RealmCache.doCreateRealmOrGetFromCache (RealmCache.java:319)
  | io.realm.RealmCache.createRealmOrGetFromCache (RealmCache.java:282)
  | io.realm.Realm.getInstance (Realm.java:378)

[cmelchior]

This is two different errors.

Caused by io.realm.exceptions.RealmError: Unrecoverable error. mmap() failed: Out of memory size: 671088640

Is due to trying to open a 671 MB Realm. On some 32 bit devices that will not be possible due to how memory mapping works. On all 64-bit devices this should be fine (all devices shipped the last 3+ years).

Unable to open a realm at path '/data/data/': Top ref outside file (size = 268484608). top_ref[0]: FF50828, top_ref[1]: 100473C0, mnemonic: 54 2D 44 42, fmt[0]: 9, fmt[1]: 9, flags: 1. (Top ref outside file (size = 268484608). top_ref[0]: FF50828, top_ref[1]: 100473C0, mnemonic: 54 2D 44 42, fmt[0]: 9, fmt[1]: 9, flags: 1) (/data/data/) in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 101

Is a different error that we are currently tracking here: #6239

[realm-probot]

Hey - looks like you forgot to add a T:* label - could you please add one?

[mehulsutariya]

@cmelchior The devices that are facing out of memory issues on 64-bit devices as well (Samsung Galaxy A9).