JDK-8316659 : assert(LockingMode != LM_LIGHTWEIGHT || flag == CCR0) failed: bad condition register
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 21,22
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • CPU: ppc
  • Submitted: 2023-09-21
  • Updated: 2023-11-03
  • Resolved: 2023-09-21
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JDK 21 JDK 22
21.0.2Fixed 22 b17Fixed
Related Reports
Relates :  
JDK-8308469 - [PPC64] Implement alternative fast-locking scheme
Description
We're running into the assertion (macroAssembler_ppc.cpp:2183) since JDK-8315880. The native wrapper doesn't use the correct ConditionRegister for the new locking mode:
V  [libjvm.so+0x14c65bc]  MacroAssembler::compiler_fast_lock_object(ConditionRegister, Register, Register, Register, Register, Register)+0x44c  (macroAssembler_ppc.cpp:2183)
V  [libjvm.so+0x18c4220]  SharedRuntime::generate_native_wrapper(MacroAssembler*, methodHandle const&, int, BasicType*, VMRegPair*, BasicType)+0x29f0  (sharedRuntime_ppc.cpp:2408)
V  [libjvm.so+0x18a1360]  AdapterHandlerLibrary::create_native_wrapper(methodHandle const&)+0x6e0  (sharedRuntime.cpp:3095)
Comments
[jdk21u-fix-request] Approval Request from Martin Bug is present in JDK21 and causes crashes when the new locking mode is used. The fix is small and only changes ConditionRegister usage for native wrappers. C2 uses the same one, so, the code is used this way already. The fix is tested in JDK22 and this PR for an additional week in JDK21. Applies cleanly.
30-10-2023
A pull request was submitted for review. URL: https://git.openjdk.org/jdk21u/pull/287 Date: 2023-10-23 17:49:12 +0000
23-10-2023
I'll test it. Will request backport approval after some time.
23-10-2023
Martin, do you want to backport this to 21u?
02-10-2023
A pull request was submitted for review. URL: https://git.openjdk.org/jdk/pull/15857 Date: 2023-09-21 10:41:56 +0000
21-09-2023
Changeset: 6a4b6655 Author: Martin Doerr <mdoerr@openjdk.org> Date: 2023-09-21 12:06:27 +0000 URL: https://git.openjdk.org/jdk/commit/6a4b6655507582ff685a999c21e7fd3992a39816
21-09-2023
Workaround: Use another LockingMode.
21-09-2023