APAR status
Closed as program error.
Error description
Error Message: There is deadlock found between java.nio.channels.spi.AbstractInterruptibleChannel and RandomAccessFile/FileInputStream/FileOutputStream when in multi thread environment . Stack Trace: There is a deadlock in the classes code: 3XMTHREADBLOCK Blocked on: java/lang/Object@0x00000000FFF51D58 Owned by: "Attach API initializer" (J9VMThread:0x0000000000F02D00, java/lang/Thread:0x00000000FFF479F8) 3XMHEAPALLOC Heap bytes allocated since last GC cycle=3768 (0xEB8) 3XMTHREADINFO3 Java callstack: 4XESTACKTRACE at java/nio/channels/spi/AbstractInterruptibleChannel.close(Abstrac tInterruptibleChannel.java:111) 4XESTACKTRACE at java/io/RandomAccessFile.close(RandomAccessFile.java:586) 5XESTACKTRACE (entered lock: java/lang/Object@0x00000000FFF515B0, entry count: 1) 3XMTHREADBLOCK Blocked on: java/lang/Object@0x00000000FFF515B0 Owned by: "Attach API teardown" (J9VMThread:0x0000000000F07E00, java/lang/Thread:0x00000000FFF48098) 3XMHEAPALLOC Heap bytes allocated since last GC cycle=19584 (0x4C80) 3XMTHREADINFO3 Java callstack: 4XESTACKTRACE at java/io/RandomAccessFile.close(RandomAccessFile.java:575) 4XESTACKTRACE at sun/nio/ch/FileChannelImpl.implCloseChannel(FileChannelImpl.java :123) 4XESTACKTRACE at java/nio/channels/spi/AbstractInterruptibleChannel$1.interrupt(A bstractInterruptibleChannel.java:165) 5XESTACKTRACE (entered lock: java/lang/Object@0x00000000FFF51D58, entry count: 1) 4XESTACKTRACE at java/nio/channels/spi/AbstractInterruptibleChannel.begin(Abstrac tInterruptibleChannel.java:180) 4XESTACKTRACE at sun/nio/ch/FileChannelImpl.lock(FileChannelImpl.java:1007) 4XESTACKTRACE at java/nio/channels/FileChannel.lock(FileChannel.java:1052) . N/A
Local fix
Do not close RandomAccessFile/FileInputStream/FileOutputStream and its channel in different thread at same time.
Problem summary
There is a wrong patch in java.io.RandomAccessFile/FileInputStream/FileOutputStream which synchronizes too much code and it cause the deadlock.
Problem conclusion
This defect will be fixed in: 7.0.0 SR6 . Modify the code to synchronize the really needed code to solve the deadlock
Temporary fix
N/A
Comments
APAR Information
APAR number
IV47606
Reported component name
JAVA CLASS LIBS
Reported component ID
620700130
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2013-08-27
Closed date
2013-09-03
Last modified date
2013-09-03
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
JAVA CLASS LIBS
Fixed component ID
620700130
Applicable component levels
R700 PSY
UP
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Document Information
Modified date:
21 February 2022