JDK-6272980 : hotspot crashes(SIGSEGV) when many local variables are used in one java program (see CR 6227033)
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 6
  • Priority: P3
  • Status: Closed
  • Resolution: Fixed
  • OS: solaris_10
  • CPU: x86
  • Submitted: 2005-05-19
  • Updated: 2011-09-15
  • Resolved: 2005-07-20
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JDK 6
6 b44Fixed
Related Reports
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JDK-6394438 - crash in C2 compiler in MachSpillCopyNode::implementation on 5.0_U4
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JDK-6983535 - JVM crashes when compiling method.
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JDK-6227033 - hotspot crashes(SIGSEGV) when many local variables are used in one java program
Description
The regression test for CR 6227033 fails (segfaults) on Solaris 10 x86, JDK6.0b36. The following options to JVM has been used: java -server -Xcomp.
To reproduce compile and run the attached test.
###@###.### 2005-05-19 11:47:08 GMT
Comments
SUGGESTED FIX http://analemma.sfbay.sun.com/net/prt-archiver.sfbay/data/archived_workspaces/main/c2_baseline/2005/20050713134529.azeem.6272980/workspace/webrevs/webrev-2005.07.13/index.html http://analemma.sfbay.sun.com/net/prt-archiver.sfbay/data/archived_workspaces/main/c2_baseline/2005/20050711113318.azeem.6272980/workspace/webrevs/webrev-2005.07.11/index.html ###@###.### 2005-07-18 18:02:43 GMT
18-07-2005
EVALUATION The bug doesn't fail because of too many local variables, but instead because the compiler is attempting to match this large tree and continually calls Label_Root until the stack overflows. I've added a counter that limits the number of times Label_Root is called, by default its at 1100 which is large enough to prevent good code from not matching, but small enough to prevent stack overflows. ###@###.### 2005-07-11 20:41:36 GMT
11-07-2005