JDK-8191101 : Show register content in hs-err file on assert
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 10
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2017-11-12
  • Updated: 2020-08-11
  • Resolved: 2018-03-30
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JDK 11
11 b10Fixed
Related Reports
Relates :  
JDK-8214229 - Enable ShowRegistersOnAssert by default
Relates :  
JDK-8216982 - Assertion poison page established too early
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JDK-8225703 - crash_handler code makes safepoint polling threads look like they crashed
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JDK-8227275 - Within native OOM error handling, assertions may hang the process
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JDK-8212913 - (Nested)ThreadsListHandleInErrorHandlingTest need to disable ShowRegistersOnAssert
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JDK-8251383 - Disable Event::log from linux_mprotect when processing the assertion poison page
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JDK-8200608 - Build failures after JDK-8191101 (Show register content in hs-err file on assert)
Description
At SAP we added a small feature to retrieve the current context when an assert happens and make that part of the hs-err file.
That works similar to the SafeFetch logic: when an assert happens, we trigger a segfault and in the signal handler we squirrel the ucontext away, before continuing with error reporting. 

We do this right after the assert condition was evaluated, within the assert macro itself, as to preserve the context as close to the assertion point as possible.

A short poll on hotspot-runtime-dev [1] indicated that there is interest we contribute this feature.

[1] http://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2017-October/025018.html
Comments
Work started, a patch proposal was posted on hotspot-runtime. Currently stalled due to lack of time.
22-02-2018