RFR(XS): 8193308: Disallow installing user signal handlers for SIGBUS on OSX

[Thomas Stüfe]

Hi Robin,

this looks fine.

Had some more looks:

- the secondary signal handler (vmError_posix.cpp) already unblocks SIGBUS
correctly.
- CheckJNI on bsd already tests that SIGBUS handler does not get
overwritten from outside.

So, looks like your patch is the last missing piece.

Best Regards, Thomas

On Tue, Feb 6, 2018 at 4:19 PM, Robin Westberg <robin.westberg at oracle.com>
wrote:

> Hi all,
>
> Please review the following change to disallow installing user signal
> handlers for SIGBUS on OSX. On OSX, SIGBUS is used internally by the VM
> (where most other platforms only use SIGSEGV), and installing a user
> handler can lead to a deadlock.
>
> Issue: https://bugs.openjdk.java.net/browse/JDK-8193308 <
> https://bugs.openjdk.java.net/browse/JDK-8193308>
> Webrev: http://cr.openjdk.java.net/~rwestberg/8193308/webrev.00/ <
> http://cr.openjdk.java.net/~rwestberg/8193308/webrev.00/>
> Testing: hs-tier1, hs-tier2
>
> Best regards,
> Robin