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I have an iMac running OS X and since yesterday my processor has been working hard for no particular reason. The computer hangs for a few minutes, then I can work again, then it hangs, etc.

Here are my console messages from the last 'hang' event:

5/23/12 3:40:37 PM  Firewall[69]    mysqld is listening from 0.0.0.0:3306 proto=6
5/23/12 3:45:06 PM  Firewall[69]    ruby is listening from 0.0.0.0:3000 proto=6
5/23/12 3:45:36 PM  com.apple.usbmuxd[35]   _SendAttachNotification (thread 0x1005f5cc0): sending attach for device 7c:c5:37:12:93:e9@fe80::7ec5:37ff:fe12:93e9._apple-mobdev._tcp.local.: _GetAddrInfoReplyReceivedCallback matched.
5/23/12 3:45:56 PM  com.apple.usbmuxd[35]   SCEDeviceSocketCallback 0x104c00970-usbmuxd/NULL remote peer closed connection for sce 0x104c00970.
5/23/12 3:46:01 PM  usbmuxd[35] _send_message (thread 0x102481000): Could not send message size 483: Broken pipe.
5/23/12 3:46:01 PM  usbmuxd[35] AMDeviceStartSession (thread 0x102481000): Could not start session: kAMDInvalidPairRecordError
5/23/12 3:46:01 PM  usbmuxd[35] _AMDevicePreflightWorker (thread 0x102481000): Pair worker could not pair with device 7: 0xe8000082
5/23/12 3:46:01 PM  com.apple.usbmuxd[35]   HandleDeviceAttachHelperCallback preflighting failed for WiFi device 0x7-192.168.1.101:0: 0xe8000082. Ignoring device.
5/23/12 3:46:03 PM  com.apple.usbmuxd[35]   _SendDetachNotification (thread 0x1005f5cc0): sending detach for device 7c:c5:37:12:93:e9@fe80::7ec5:37ff:fe12:93e9._apple-mobdev._tcp.local.: _BrowseReplyReceivedCallback got bonjour removal.
5/23/12 3:48:17 PM  com.apple.usbmuxd[35]   _SendAttachNotification (thread 0x1005f5cc0): sending attach for device 7c:c5:37:12:93:e9@fe80::7ec5:37ff:fe12:93e9._apple-mobdev._tcp.local.: _GetAddrInfoReplyReceivedCallback matched.
5/23/12 3:48:18 PM  usbmuxd[35] _AMDeviceConnectByAddressAndPort (thread 0x102481000): IPv4
5/23/12 3:50:23 PM  ntpd[31]    time reset -0.679154 s

I get these three lines often and they completely freeze my computer for a couple of minutes while they're happening:

5/23/12 7:34:14 PM  com.apple.usbmuxd[35]   _SendAttachNotification (thread 0x1005f5cc0): sending attach for device 7c:c5:37:12:93:e9@fe80::7ec5:37ff:fe12:93e9._apple-mobdev._tcp.local.: _GetAddrInfoReplyReceivedCallback matched.
5/23/12 7:34:14 PM  usbmuxd[35] _AMDeviceConnectByAddressAndPort (thread 0x102481000): IPv4
5/23/12 7:34:34 PM  com.apple.usbmuxd[35]   _SendDetachNotification (thread 0x1005f5cc0): sending detach for device 7c:c5:37:12:93:e9@fe80::7ec5:37ff:fe12:93e9._apple-mobdev._tcp.local.: _BrowseReplyReceivedCallback got bonjour removal.

It seems to gets worse when I open up a browser, especially Chrome, but it happens otherwise as well. Do you know what might be going on here?

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Looks like some network device, actually. Notice the MAC addresses. –  kevlar1818 May 23 '12 at 20:44
    
just by the name of the offending lines, it looks like a USB multiplexer is hanging - IDK much about macs, but maybe a USB driver issue? –  Nate Koppenhaver May 24 '12 at 0:29

2 Answers 2

up vote 3 down vote accepted

After two days of problem solving, it turned out that the intermittent hanging and loud sounds from the computer were due to hard drive failure.

I still do not know whether the console messages were a direct result of the hard drive's failure or not, but since replacing the hard drive (today) everything seems to work fine.

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This makes it sound like iTunes is having issues with an attached iPod/iPhone/iPad http://apple.stackexchange.com/questions/22414/how-to-fix-usbmuxd-spam-in-console-when-iphone-is-connected

Repeated "Attach" then "Detach" messages make it sound like a flaky USB connection. Do you get any different result without any USB devices or hubs attached?

+Edit:

Snippets from ends of those log lines (GetAddrInfo, Browse, bonjour) make me think that it's more likely seeing the repeated appearance + disappearance of some Bonjour / ZeroConf network device.

Can you try unplugging or turning wifi off and see if you still see the issue?

Some places that Bonjour things might be appearing & disappearing include:

  • iTunes shared
  • iChat
  • Finder: Shared or Network
  • etc.

...closing as many of your Bonjour-enabled things as possible might help.

Also "Activity Monitor".app might show more detail (make sure you show "All Processes" and sort by CPU usage), or red-highlight the occasionally unresponsive app.

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Thanks DouglasDD - it turns out that the problem was due to a hard drive failure. Everything seems to be OK now that the drive has been replaced. –  sscirrus May 26 '12 at 8:23

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