maintainer-feedback requested: [Bug 207735] www/firefox: DTRACE no longer works since 41.0

[bugzilla-noreply at freebsd.org]

Jan Beich <jbeich at FreeBSD.org> has reassigned Bugzilla Automation
<bugzilla at FreeBSD.org>'s request for maintainer-feedback to gecko at FreeBSD.org:
Bug 207735: www/firefox: DTRACE no longer works since 41.0
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207735



--- Description ---
dtrace fails to install probes with long names e.g.,

_ZL19NewArrayTryUseGroupILj4294967295EEP8JSObjectPN2js16ExclusiveContextEN2JS6H
andleIPNS2_11ObjectGroupEEEmNS2_13NewObjectKindEb

Steps to reproduce:
1. Build www/firefox with DTRACE=on
2. kldload dtraceall or kldload sdt
3. Start firefox
4. Check dtrace -l output

Actual result:
$ dtrace -l | fgrep javascript
<empty>

Expected result:
$ dtrace -l | fgrep javascript
33327 javascript65009		     js
_ZN2js13ExecuteKernelEP9JSContextN2JS6HandleIP8JSScriptEER8JSObjectRKNS2_5Value
ESB_NS_11ExecuteTypeENS_16AbstractFramePtrEPS9_
execute-done
33328 javascript65009		     js
_ZN2js13ExecuteKernelEP9JSContextN2JS6HandleIP8JSScriptEER8JSObjectRKNS2_5Value
ESB_NS_11ExecuteTypeENS_16AbstractFramePtrEPS9_
execute-start
33329 javascript65009		     js
_ZN2js16InterpreterFrame8prologueEP9JSContext function-entry
...

Bisecting first bad:
https://hg.mozilla.org/mozilla-central/rev/3a994e364343