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libhdfs registers a pthread TLS destructor, hdfsThreadDestructor, that detaches the current thread from the JVM whenever it finds a cached JNIEnv. It does so regardless of who attached the thread. When the JVM (or an embedding application) attached the thread, the JNIEnv it still holds may already have been freed by the time the destructor runs, so dereferencing it reads freed memory (heap-use-after-free, SIGSEGV). Track in ThreadLocalState whether libhdfs attached the thread itself, determined in getGlobalJNIEnv via GetEnv before attaching, and skip the JNI detach in hdfsThreadDestructor for threads libhdfs did not attach. Contributed-by: Jeremy Coulon Assisted-by: OpenCode (GLM-5.3-Flash)
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ayushtkn
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LGTM
I am not sure what is this failure being referenced here: https://github.com/apache/hadoop/pull/8739/checks?check_run_id=103675831551
Please check once on those before merging
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I had disabled GitHub Actions in my fork. I enabled it and now it's running. |
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Description of PR
libhdfs registers a pthread TLS destructor, hdfsThreadDestructor, that detaches the current thread from the JVM whenever it finds a cached JNIEnv. It does so regardless of who attached the thread. When the JVM (or an embedding application) attached the thread, the JNIEnv it still holds may already have been freed by the time the destructor runs, so dereferencing it reads freed memory (heap-use-after-free, SIGSEGV).
Track in ThreadLocalState whether libhdfs attached the thread itself, determined in getGlobalJNIEnv via GetEnv before attaching, and skip the JNI detach in hdfsThreadDestructor for threads libhdfs did not attach.
The original patch is authored by Jeremy Coulon.
Assisted-by: OpenCode (GLM-5.3-Flash)
JIRA: HDFS-16021
How was this patch tested?
The same fix is reviewed in Apache DataFusion Comet side: apache/datafusion-comet#5890
For code changes:
declared according to the connector-specific documentation? Note: Automated CI
testing doesn't cover all cases so manual testing with cloud storage is still
required.
LICENSE,LICENSE-binary,NOTICE-binaryfiles?AI Tooling
If an AI tool was used:
where is the name of the AI tool used.
https://www.apache.org/legal/generative-tooling.html