[jdk25] RFR: 8358183: [JVMCI] crash accessing nmethod::jvmci_name in CodeCache::aggregate
Tobias Hartmann
thartmann at openjdk.org
Fri Jul 11 06:12:39 UTC 2025
On Thu, 10 Jul 2025 17:40:20 GMT, Boris Ulasevich <bulasevich at openjdk.org> wrote:
> This is the backport of the JVMCI metadata crash fix.
>
> Issue:
> When flushing nmethods via CodeBlob::purge(), the JVMCI metadata was freed (mutable_data) but its size fields remained non-zero. As a result, invoking heap analytics via jcmd Compiler.CodeHeap_Analytics still walks the purged metadata and calls jvmci_name() on arbitrary memory, leading to intermittent crashes
>
> Fix:
> Extend CodeBlob::purge() to zero out the _mutable_data_size, _relocation_size, and _metadata_size fields so that after a purge jvmci_data_size() returns 0 and CompileBroker::print_heapinfo() skips any JVMCI metadata
Looks good to me.
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Marked as reviewed by thartmann (Reviewer).
PR Review: https://git.openjdk.org/jdk/pull/26248#pullrequestreview-3008753772
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