Bug ID: JDK-6899058 G1: Internal error in ptrQueue.cpp:201 in nightly tests

Type: Bug
Component: hotspot
Sub-Component: gc
Affected Version: 7

Priority: P3
Status: Resolved
Resolution: Fixed
OS: generic
CPU: generic

Submitted: 2009-11-06
Updated: 2013-09-18
Resolved: 2010-02-08

Versions (Unresolved/Resolved/Fixed)

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JDK 6	Other
6u21Fixed	hs17Fixed

The following nightly test:

nsk/stress/jni/gclocker/gcl001

is failing on linux_amd64.

The result directory (including hs_err file) can be found at:

http://sqeweb.sfbay.sun.com/nfs/results/vm/gtee/JDK7/NIGHTLY/VM/2009-11-03/G1_GC_Baseline/vm/linux-amd64/server/mixed/linux-amd64_server_mixed_nsk.stress.testlist/ResultDir/gcl001//hs_err_pid7207.log

The link to the failure (giving machine details etc) can ve found at:

http://sqeweb.sfbay.sun.com/nfs/results/vm/gtee/JDK7/NIGHTLY/VM/2009-11-03/G1_GC_Baseline/vm/linux-amd64/server/mixed/linux-amd64_server_mixed_nsk.stress.testlist/analysis.html
gc/gctests/StringGC

EVALUATION This CR is now considered to have been caused as a result of a regression introduced in 6888898 which affects all collectors, not just G1. See 6896647 where that regression is being fixed.
16-12-2009
EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/fa357420e7d2
25-11-2009
SUGGESTED FIX The fix is to remove elements from the completed update buffer queue under control of the same lock using in the code that adds them. This means that we need only one (locking) version of get_completed_buffer.
20-11-2009
EVALUATION Race on the dirty card queue completed buffer list between worker thread(s) performing a flush of a deferred store barrier (enqueueing a newly completed buffer) and worker thread(s) in the RSet updating code claiming completed buffers.
07-11-2009

Relates :	JDK-6896647 - card marks can be deferred too long
Relates :	JDK-6888898 - CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
Relates :	JDK-6915005 - G1: Hang in PtrQueueSet::completed_buffers_list_length with gcl001
Relates :	JDK-6902115 - G1:assert(ignore_max_completed\|\|thread->is_Java_thread()\|\|SafepointSynchronize::is_at_safepoint())