Failed to -XX:+UseZGC (SIGSEGV error)

[Per Liden]

Hi,

On 03/01/2018 10:57 AM, Aleksey Shipilev wrote:
> On 03/01/2018 02:55 AM, Wenyu Zhao wrote:
>> # Problematic frame: # V PhaseChaitin::gather_lrg_masks(bool)+0x14d
> 
> This looks like a C2 bug, maybe caused by ZGC code shape, which might explain why G1 works. Running
> with fastdebug build (./configure --with-debug-level=fastdebug) would probably meaningfully assert.
> After that, you can look at bugs.openjdk.java.net for the similar failures.
> 
> You may want to try these fastdebug/slowdebug nightly builds and see if issue reproduces there too
> (this makes local native compiler bugs less likely):
>    https://builds.shipilev.net/openjdk-zgc/

Would also be interesting to know if you see the same problem when 
running on an Intel CPU. We have seen some strange things happening on 
AMD CPUs in the past.

> 
>> PS: Error logs are attached below.
> 
> Unfortunately, attachments are stripped from many OpenJDK lists.

Yep, I think the limit is 40K for attachments.

/Per

> 
> -Aleksey
>