Yosemite random Crash - discoveryd_helper[147]: Basic RemoteControl com.apple.discoveryd_helper Starting XPC Server

Question

Hi Everyone,
i have a crash every now and then. Looks like it has something to do with Networking or Bonjour.
Nov 10 23:55:34.018358 Chriss-iMac.local discoveryd_helper[147]: Basic RemoteControl com.apple.discoveryd_helper Starting XPC Server
Nov 10 23:55:34.018593 Chriss-iMac.local discoveryd_helper[147]: Detailed RemoteControl com.apple.discoveryd_helper XPC connection 0x7ff9d0600210: start (pid=50, <unknown> not root)
Nov 10 23:55:34.018358 Chriss-iMac.local discoveryd_helper[147]: Basic RemoteControl com.apple.discoveryd_helper Starting XPC Server
Nov 10 23:55:34.018593 Chriss-iMac.local discoveryd_helper[147]: Detailed RemoteControl com.apple.discoveryd_helper XPC connection 0x7ff9d0600210: start (pid=50, <unknown> not root)
anyone got any idea what it could be ? I learned that
there is no more com.apple.mDNSResponder.plist in OS X 10.10. The service that controls mDNSResponder is now discoverd. The plist file you are looking for is actually:
/System/Library/LaunchDaemons/com.apple.discoveryd.plist
You want to add --no-multicast to the ProgramArguments in that file.
  <key>ProgramArguments</key> <array> <string>/usr/libexec/discoveryd</string> <string>--udsocket</string> <string>standard</string> <string>--loglevel</string> <string>Basic</string> <string>--logclass</string> <string>Everything</string> <string>--logto</string> <string>asl</string> </array>
Becomes
  <key>ProgramArguments</key> <array> <string>/usr/libexec/discoveryd</string> <string>--udsocket</string> <string>standard</string> <string>--loglevel</string> <string>Basic</string> <string>--logclass</string> <string>Everything</string> <string>--logto</string> <string>asl</string> <string>--no-multicast</string> </array>
but doing this (adding --no-multicast) disables finding and communicating with printers in my network and my timemachine backup drive can't be found.
..... any clues ? this is driving me mad.

Answer 1

Same issue here after updating to Yosemite. No useful information before the crash in system log as can be seen below. User reports trying to open a pdf right before the last 2 crashes, probably coincidence. User works with files from network shares. Default pdf viewer is set to Adobe Reader.
System log right before the crash:
Nov 17 14:53:20 Beths-MacBook-Pro.local CalendarAgent[53219]: [com.apple.calendar.store.log.caldav.queue] [Account refresh failed with error: Error Domain=CoreDAVHTTPStatusErrorDomain Code=404 "The operation couldn’t be completed. (CoreDAVHTTPStatusErrorDomain error 404.)" UserInfo=0x7f92c1511860 {AccountName=bcole@???.com, CalDAVErrFromRefresh=YES, CoreDAVHTTPHeaders=<CFBasicHash 0x7f92c3905660 [0x7fff7bdd6cf0]>{type = immutable dict, count = 9,
  entries =>
  0 : Server = <CFString 0x7f92c3888510 [0x7fff7bdd6cf0]>{contents = "Kerio Connect 8.3.1"}
  1 : Content-Type = text/html
  2 : Transfer-Encoding = <CFString 0x7fff7a75c558 [0x7fff7bdd6cf0]>{contents = "Identity"}
  3 : X-UA-Compatible = IE=edge
  6 : Date = <CFString 0x7f92c38899b0 [0x7fff7bdd6cf0]>{contents = "Mon, 17 Nov 2014 20:53:20 GMT"}
  7 : X-Frame-Options = <CFString 0x7f92c38899e0 [0x7fff7bdd6cf0]>{contents = "SAMEORIGIN"}
  8 : Content-Encoding = deflate
  10 : Keep-Alive = <CFString 0x7f92c38884e0 [0x7fff7bdd6cf0]>{contents = "timeout=15, max=99"}
  12 : Connection = <CFString 0x7f92c3888700 [0x7fff7bdd6cf0]>{contents = "Keep-Alive"}
Nov 17 14:53:20 Beths-MacBook-Pro.local CalendarAgent[53219]: [com.apple.calendar.store.log.caldav.queue] [Coalescing failed operation [<CalDAVAccountRefreshQueueableOperation: 0x7f92c385ea60; Sequence: 0>]]
Nov 17 14:54:02 Beths-MacBook-Pro.local system_profiler[91306]: platformPluginDictionary: Can't get X86PlatformPlugin, return value 0
Nov 17 14:54:33 --- last message repeated 1 time ---
Nov 17 14:58:07 localhost bootlog[0]: BOOT_TIME 1416257887 0
Nov 17 14:58:10 localhost syslogd[17]: Configuration Notice:
  ASL Module "com.apple.AccountPolicyHelper" claims selected messages.
CrashReporter Log:
Nov 17 14:58:11.831237 Beths-MacBook-Pro.local discoveryd_helper[170]: Basic RemoteControl com.apple.discoveryd_helper Starting XPC Server
Nov 17 14:58:11.834289 Beths-MacBook-Pro.local discoveryd_helper[170]: Detailed RemoteControl com.apple.discoveryd_helper XPC connection 0x7fc848e04390: start (pid=49, <unknown> not root)