> There is a race between `JvmtiClassFileReconstituter::copy_bytecodes` and > `InstanceKlass::link_class_impl`. `InstanceKlass::link_class_impl` can be > rewriting bytecodes. `JvmtiClassFileReconstituter::copy_bytecodes` will not > restore them to the original ones because the flag `rewritten` is `false`. > This will result in invalid bytecode. > > This PR adds a lock (`init_lock`) to the `copy_bytecodes` method to prevent > reading bytecodes while they are being rewritten during class linking. > > Tested fastdebug and release builds: Linux x86_64 and arm64 > - The reproducer from JDK-8277444 passed. > - Tier1 - tier3 passed.
Evgeny Astigeevich has updated the pull request incrementally with one additional commit since the last revision: Add missing include runtime/synchronizer.hpp ------------- Changes: - all: https://git.openjdk.org/jdk/pull/26863/files - new: https://git.openjdk.org/jdk/pull/26863/files/4882b2db..d6895181 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=26863&range=01 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26863&range=00-01 Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/26863.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/26863/head:pull/26863 PR: https://git.openjdk.org/jdk/pull/26863
