hg: jdk/sandbox: 8237080: fatal error: VM thread could block on lock that may be held by a JavaThread during safepoint: SharedDecoder_lock

[chris.hegarty at oracle.com]

Changeset: 0f53754d8577
Author:    coleenp
Date:      2020-01-30 08:50 -0500
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/0f53754d8577

8237080: fatal error: VM thread could block on lock that may be held by a JavaThread during safepoint: SharedDecoder_lock
Summary: Set allow_vm_block to true for this lock.  It's _safepoint_check_never so it's sort of implied (you can't safepoint holding the lock and block out the vm thread).
Reviewed-by: rehn, zgu, pchilanomate, dholmes

! src/hotspot/share/runtime/mutexLocker.cpp