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8059735: make_not_entrant_or_zombie sees zombies

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Make sure nmethod is not set to zombie state twice by sweeper and safepoint code.

Reviewed-by: kvn, anoll, mgerdin
This commit is contained in:
Tobias Hartmann 2014-10-08 09:23:18 +02:00
parent 82171aa7ab
commit 3ed02be10e
1 changed files with 17 additions and 9 deletions
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26
hotspot/src/share/vm/runtime/sweeper.cpp
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@ -540,17 +540,25 @@ int NMethodSweeper::process_nmethod(nmethod *nm) {
// If there are no current activations of this method on the
// stack we can safely convert it to a zombie method
if (nm->can_not_entrant_be_converted()) {
if (PrintMethodFlushing && Verbose) {
tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (not entrant) being made zombie", nm->compile_id(), nm);
}
// Clear ICStubs to prevent back patching stubs of zombie or unloaded
// nmethods during the next safepoint (see ICStub::finalize).
MutexLocker cl(CompiledIC_lock);
nm->clear_ic_stubs();
// Code cache state change is tracked in make_zombie()
nm->make_zombie();
_zombified_count++;
SWEEP(nm);
{
MutexLocker cl(CompiledIC_lock);
nm->clear_ic_stubs();
}
// Acquiring the CompiledIC_lock may block for a safepoint and set the
// nmethod to zombie (see 'CodeCache::make_marked_nmethods_zombies').
// Check if nmethod is still non-entrant at this point.
if (nm->is_not_entrant()) {
if (PrintMethodFlushing && Verbose) {
tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (not entrant) being made zombie", nm->compile_id(), nm);
}
// Code cache state change is tracked in make_zombie()
nm->make_zombie();
_zombified_count++;
SWEEP(nm);
}
assert(nm->is_zombie(), "nmethod must be zombie");
} else {
// Still alive, clean up its inline caches
MutexLocker cl(CompiledIC_lock);