RFR(S): 8016277: Crash in nmethod::is_compiled_by_c1() on x86

Roland Westrelin roland.westrelin at oracle.com
Wed Aug 21 01:01:55 PDT 2013


Once an nmethod becomes zombie, its Method can be reclaimed so the reference to the Method in the nmethod becomes invalid.

My change sets the nmethod's _method to NULL once the nmethod is in the zombie state so that we risk using an invalid reference. The crash itself was cause by nmethod::is_native_method() (which uses the Method pointer of the nmethod) called from nmethod::is_compiled_by_c1() by some verification code. I changed the implementation of the nmethod::is_compiled_by_* so that they don't need to call is_native_method() (a call that was anyway useless because for a native method the compiler() is NULL).


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