review for 6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify (original) (raw)

Tom Rodriguez tom.rodriguez at oracle.com
Thu May 12 14:31:02 PDT 2011

http://cr.openjdk.java.net/~never/6996747 149 lines changed: 149 ins; 0 del; 0 mod; 10537 unchg

6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify Reviewed-by:

When the sweeper is processing an nmethod it's possible for a safepoint to occur while acquiring locks to clean the inline caches. This can allow the nmethod to be unloaded in the middle of processing it which can result in assertion failures or crashes. I considered modifying the locks to skip the safepoint check but it would require changing CompiledIC_lock, InlineCacheBuffer_lock and VtableStubs_lock which seems risky. Instead I keep track of the currently nmethod in the CompiledThread and scan it when a GC occurs. I also included some sweeper logging code that I wrote while debugging this. Tested with failing test from report though we'll need big apps runs to confirm that there aren't other issues.

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