Firefox 63 vs. sendmsg()

[Don Lewis]

On 19 Jul, Jan Beich wrote:
> Jan Kokemüller <jan.kokemueller at gmail.com> writes:
> 
>>> Can someone help debug https://bugzilla.mozilla.org/show_bug.cgi?id=1475970#c7 ?
>>> I'm not familar with socket code.
>>
>> Could it be related to this bug[1]?
>> There is a demo program in another bug report[2] that still fails for me
>> (running a recent -current, r334337).
>>
>> [1]: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=181741
>> [2]: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215933
> 
> Indeed. Firefox 63 works fine after applying the patch in bug 181741.
> I wonder, if "packet loss" issue is also responsible for IPC instability
> in Firefox < 63 and Chromium.

I've been having terrible stability problems with Firefox on my
11.2-STABLE amd64 machine since upgrading to version 61.  See:
  https://bugzilla.mozilla.org/show_bug.cgi?id=1476130
I applied this patch:
  https://bugs.freebsd.org/bugzilla/attachment.cgi?id=168943&action=diff
after tweaking it a bit so that all chunks would apply.  It's too soon
to tell for sure, but this fix appears promising.