xuchuanyin created CARBONDATA-1878:
--------------------------------------
Summary: JVM crash after off-heap-sort disabled
Key: CARBONDATA-1878
URL: https://issues.apache.org/jira/browse/CARBONDATA-1878
Project: CarbonData
Issue Type: Bug
Components: core
Affects Versions: 1.3.0
Reporter: xuchuanyin
Assignee: xuchuanyin
# SCENARIO
Recently I have fixed some issues in Carbondata. To perform a full test to
cover all the code that has been modified by me, I performed some iteration of
the whole test case. Each iteration is started with different key
configurations that will affect the flow in the code.
After I set `enable.offheap.sort=false` (default value is true) in the
configuration, running tests will always end up with JVM crash error. The error
messages are shown as below:
```
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007f346b207ff1, pid=144619, tid=0x00007f346c2fc700
#
# JRE version: Java(TM) SE Runtime Environment (8.0_111-b14) (build
1.8.0_111-b14)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.111-b14 mixed mode linux-amd64
compressed oops)
# Problematic frame:
# V [libjvm.so+0xa90ff1] Unsafe_SetNativeShort+0x51
#
# Failed to write core dump. Core dumps have been disabled. To enable core
dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /home/xu/ws/carbondata/hs_err_pid144619.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#
Process finished with exit code 134 (interrupted by signal 6: SIGABRT)
```
# STEPS TOREPRODUCE
The error can be easily reproduced in different ways. Here I will provide a
simple way to reproduce it:
1. Find the test case `DateDataTypeDirectDictionaryTest`.
2. Add the following code in the method `beforeAll`.
```
CarbonProperties.getInstance()
.addProperty(CarbonCommonConstants.ENABLE_OFFHEAP_SORT, "false")
```
3. Run this test case.
4. You will find the test failed with the above error.
5. Replace the code in Step2 with the following code:
```
CarbonProperties.getInstance()
.addProperty(CarbonCommonConstants.ENABLE_OFFHEAP_SORT, "true")
```
6. Run this test case.
7. The test is success without error.
# ANALYZE & RESOLVE
I have reproduced this error and analyzed the core dump file. The final stack
message in core dump looks like below:
```
Thread 73303: (state = IN_VM)
- sun.misc.Unsafe.putShort(long, short) @bci=0 (Interpreted frame)
-
org.apache.carbondata.core.indexstore.UnsafeMemoryDMStore.addToUnsafe(org.apache.carbondata.core.indexstore.schema.CarbonRowSchema,
org.apache.carbondata.core.indexstore.row.DataMapRow, int) @bci=781, line=150
(Interpreted frame)
-
org.apache.carbondata.core.indexstore.UnsafeMemoryDMStore.addIndexRowToUnsafe(org.apache.carbondata.core.indexstore.row.DataMapRow)
@bci=59, line=99 (Interpreted frame)
...
```
After inspecting the code, I found there lies bug in `UnsafeMemoryDMStore
line=150` while writing length to unsafe memory -- It writes with wrong base
object.
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