RFR: 8257228: G1: SIGFPE in G1ConcurrentRefine::create(int*) due to buffers_to_cards overflow [v4]

[Jie Fu]

> Hi all,
> 
> SIGFPE was observed by running:
> java -XX:G1ConcRefinementThresholdStep=16G -XX:G1UpdateBufferSize=1G -version
> 
> The reason is that buffers_to_cards [1] returns 0 for 'step' due to overflow.
> It would be better to add overflow check logic is it.
> 
> Testing:
>   - tier1 on Linux/x64
> 
> Thanks.
> Best regards,
> Jie
> 
> [1] https://github.com/openjdk/jdk/blob/master/src/hotspot/share/gc/g1/g1ConcurrentRefine.cpp#L235

Jie Fu has updated the pull request incrementally with one additional commit since the last revision:

  Only run the test on 64-bit machines

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1489/files
  - new: https://git.openjdk.java.net/jdk/pull/1489/files/e3ea5de1..8bdeb20a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1489&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1489&range=02-03

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1489.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1489/head:pull/1489

PR: https://git.openjdk.java.net/jdk/pull/1489