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Bug ID: 6977974 CMS: blockOffsetTable.hpp:187 assert(!reducing || _offset_array[i] >= offset) failed: Not reducing
6977974 : CMS: blockOffsetTable.hpp:187 assert(!reducing || _offset_array[i] >= offset) failed: Not reducing

Details
Type:
Bug
Submit Date:
2010-08-18
Status:
Open
Updated Date:
2013-05-03
Project Name:
JDK
Resolved Date:
Component:
hotspot
OS:
generic
Sub-Component:
gc
CPU:
generic
Priority:
P4
Resolution:
Unresolved
Affected Versions:
hs19
Targeted Versions:
hs25

Related Reports
Backport:
JDK-2197586 - CMS: blockOffsetTable.hpp:187 assert(!reducing || _offset_array[i] >= offset) failed: Not reducing
Backport:
JDK-2197880 - CMS: blockOffsetTable.hpp:187 assert(!reducing || _offset_array[i] >= offset) failed: Not reducing
Backport:
JDK-2199781 - CMS: blockOffsetTable.hpp:187 assert(!reducing || _offset_array[i] >= offset) failed: Not reducing
Relates:
JDK-6978533 - CMS: Elide BOT update asserts until 6977974 is fixed correctly
Relates:
JDK-6948538 - CMS: BOT walkers can fall into object allocation and initialization cracks

Sub Tasks

Description
This is an assert that was added recently as part of 6948538.
It seems to occur more readily with iCMS, much less readily with CMS.
It is likely that it's just that the new assertion checking is
uncovering an existing bug that was not uncovered prior to
the additional assertion checking.

Comments
Would be good to take a look at this for hs25. If we can fix the root cause we can comment in the assert that was commented out by JDK-6978533.
2013-05-03 
EVALUATION

Fails nightly testing, VM crash
2010-12-15 
EVALUATION

Does not fail nightly testing today; see CR 6978533 for further related background.
2010-12-15 
EVALUATION

Newly added assert uncovered existing issue. Under investigation.
2010-08-19


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