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Bug
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Resolution: Fixed
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Low
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9.1.0
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3
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Severity 3 - Minor
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40
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Issue Summary
Confluence startup can block indefinitely on a virtual system in the absence of entropy random data.
This is reproducible on Data Center: yes
Steps to Reproduce
- Install Confluence 8.x on a VM with no entropy random data and fully start it up and shut it back down
- Upgrade to Confluence 9.1.0 but do not start Confluence yet
- Update <Confluence9.1.0Install>/confluence/WEB-INF/classes/log4j.properties with
log4j.logger.com.atlassian.confluence.upgrade.upgradetask=INFO
- Start Confluence 9.1.0
Expected Results
The following lines are logged in atlassian-confluence.log file with no delay 
:
2024-10-22 11:37:03,885 INFO [Catalina-utility-1] [atlassian.confluence.upgrade.UpgradeTask] secureLocalConfigSecrets Securing local config secrets now... 2024-10-22 11:37:04,251 INFO [Catalina-utility-1] [atlassian.confluence.upgrade.UpgradeTask] secureLocalConfigSecrets Local config secrets secured.
Actual Results
Only the following line is logged in atlassian-confluence.log file:
2024-10-22 11:37:03,885 INFO [Catalina-utility-1] [atlassian.confluence.upgrade.UpgradeTask] secureLocalConfigSecrets Securing local config secrets now...
and Confluence startup blocks 
.
Taking Thread dumps shows:
"Catalina-utility-1" #20 prio=1 os_prio=0 cpu=37724.56ms elapsed=1677.10s tid=0x00007fa7ac897820 nid=0x8b runnable [0x00007fa7360fc000] java.lang.Thread.State: RUNNABLE at java.io.FileInputStream.readBytes(java.base@17.0.12/Native Method) at java.io.FileInputStream.read(java.base@17.0.12/FileInputStream.java:276) at java.io.FilterInputStream.read(java.base@17.0.12/FilterInputStream.java:132) at sun.security.provider.NativePRNG$RandomIO.readFully(java.base@17.0.12/NativePRNG.java:425) at sun.security.provider.NativePRNG$RandomIO.ensureBufferValid(java.base@17.0.12/NativePRNG.java:528) at sun.security.provider.NativePRNG$RandomIO.implNextBytes(java.base@17.0.12/NativePRNG.java:547) - locked <0x00000000c0378710> (a java.lang.Object) at sun.security.provider.NativePRNG$Blocking.engineNextBytes(java.base@17.0.12/NativePRNG.java:269) at java.security.SecureRandom.nextBytes(java.base@17.0.12/SecureRandom.java:758) at com.atlassian.secrets.service.aes.AESEncryptionBackend.generateIV(AESEncryptionBackend.java:156) at com.atlassian.secrets.service.aes.AESEncryptionBackend$$Lambda$2568/0x00007fa73dd659c8.get(Unknown Source) at com.atlassian.secrets.service.aes.AESEncryptionBackend.seal(AESEncryptionBackend.java:102) at com.atlassian.secrets.service.DefaultSecretService.put(DefaultSecretService.java:56) at com.atlassian.confluence.impl.security.ConfluenceSecretService.put(ConfluenceSecretService.java:115) at com.atlassian.confluence.impl.setup.ConfluenceApplicationConfig.lambda$save$1(ConfluenceApplicationConfig.java:135) at com.atlassian.confluence.impl.setup.ConfluenceApplicationConfig$$Lambda$2539/0x00007fa73dd38658.accept(Unknown Source) at java.lang.Iterable.forEach(java.base@17.0.12/Iterable.java:75) at com.atlassian.confluence.impl.setup.ConfluenceApplicationConfig.save(ConfluenceApplicationConfig.java:123) - locked <0x00000000c275a8f0> (a com.atlassian.confluence.impl.setup.ConfluenceApplicationConfig) at com.atlassian.confluence.upgrade.upgradetask.SecureLocalConfigSecretsUpgradeTask.secureLocalConfigSecrets(SecureLocalConfigSecretsUpgradeTask.java:75) at com.atlassian.confluence.upgrade.upgradetask.SecureLocalConfigSecretsUpgradeTask.upgrade(SecureLocalConfigSecretsUpgradeTask.java:65) at com.atlassian.confluence.upgrade.upgradetask.SecureLocalConfigSecretsUpgradeTask.doUpgrade(SecureLocalConfigSecretsUpgradeTask.java:60) at com.atlassian.confluence.upgrade.AbstractUpgradeManager$UpgradeStep$4.execute(AbstractUpgradeManager.java:788) at com.atlassian.confluence.upgrade.AbstractUpgradeManager.executeUpgradeTask(AbstractUpgradeManager.java:325) at com.atlassian.confluence.upgrade.AbstractUpgradeManager.executeUpgradeStep(AbstractUpgradeManager.java:296) at com.atlassian.confluence.upgrade.AbstractUpgradeManager.runUpgradeTasks(AbstractUpgradeManager.java:267) at com.atlassian.confluence.upgrade.impl.DefaultUpgradeManager.runUpgradeTasks(DefaultUpgradeManager.java:346) at com.atlassian.confluence.upgrade.AbstractUpgradeManager.runAllUpgradeTasks(AbstractUpgradeManager.java:181) at com.atlassian.confluence.upgrade.AbstractUpgradeManager.upgrade(AbstractUpgradeManager.java:140) ...
Setting this JVM flag has no effect
-Djava.security.egd=file:/dev/urandom
Diagnosis
Running this on the Linux OS will block indefinitely when the OS has insufficient entropy data :
head -1 /dev/random
Workaround
If starting Confluence in a Docker container environment, re-map /dev/random to /dev/urandom, e.g.
Docker run command
-v /dev/urandom:/dev/random:ro
- is related to
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- Closed
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