RFR(xs): 8187028: [aix] Real thread stack size may be up to 64K smaller than requested one

[Lindenmaier, Goetz]

Hi,

one more thing: TestOptionsWithRanges sets the stack size to SIZE_MAX. Adding 64K will overflow this.
You actually need to check for this. Be aware that some stack sizes are limited in jdk10, but not in jdk9.

Best regards,
  Goetz



From: ppc-aix-port-dev [mailto:ppc-aix-port-dev-bounces at openjdk.java.net] On Behalf Of Thomas Stüfe
Sent: Thursday, August 31, 2017 12:09 PM
To: ppc-aix-port-dev at openjdk.java.net
Subject: RFR(xs): 8187028: [aix] Real thread stack size may be up to 64K smaller than requested one

Hi all,

please review this change:

Bug:
https://bugs.openjdk.java.net/browse/JDK-8187028

change:
http://cr.openjdk.java.net/~stuefe/webrevs/8187028-aix-Real-thread-stack-size-may-be-up-to-64K-smaller-than-requested-one/webrev.00/webrev/

The issue is that on AIX, pthread library seems to have a bug where it sometimes gives us less thread stack space than we requested (a variable amount, but seems to be 0..64K). This may cause intermittent stack overflow errors if the stacks are very small to begin with.

The workaround is to add 64K to the requested stack size to account for the fact that the OS may give us up to 64K less stack.

Also, improved logging.

Thanks, Thomas
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