Mountain Lion: Constant Sandbox denies for mdworker

Question

I'm trying to find out what's causing sandboxd to throw several messages to the Console.  Since installation (upgrade from 10.7.4), I've seen these:
sandboxd[70533] ([70530]): mdworker(70530) deny file-write-create /Users/brian/Library/Keychains/login.keychain.sb-###### loads of numbers.
I usually get them in batches of 12, and they literally come about 10-15x a minute at worst.  I'm sure this isn't great for performance, and I'd really just like to stop whatever's causing it, if only so I can more clearly read my Console when other things are legitimately going wrong.  I also don't want Spotlight writing to my Keychain.  What's that all about?
I don't have any Spotlight plugins, so I can't imagine why mdworker would be trying to modify my Keychain.  I got that tip with my Google-fu, but I can't tell what else this might be.
kernel[0]: Sandbox: sandboxd(70547) deny mach-lookup com.apple.coresymbolicationd  This is a new one for me, just started earlier today, if it helps pinpoint anything.
Has anyone else got a clue what could be causing mdworker to anger the sandbox so?
Thanks!

Answer 1

This procedure is a diagnostic test. It will make no changes to your system, and therefore will not, in itself, solve your problem.
If you have more than one user account, you must be logged in as an administrator to carry out these instructions.
Triple-click anywhere in the line below to select it:
sudo iosnoop | sed '50q'
Copy the selected text to the Clipboard (command-C).
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the page that opens.
Paste into the Terminal window (command-V). You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning not to screw up. You don't need to post the warning. If you don’t have a login password, you’ll need to set one before you can run the command. If you see a message that your username "is not in the sudoers file," then you're not logged in as an administrator.
Text will begin to scroll in the Terminal window. When it stops, copy the text output — not a screenshot — from the Terminal window into a reply to this message. Please don't post more than requested.
If any personal information, such as your name, appears in the output, edit before posting, but don’t remove the context.
You can then quit Terminal.
Important: There seems to be an obscure bug in OS X that sometimes causes input devices to lag or stutter after running iosnoop. If you notice this behavior, simply reboot to clear it.