Any advice on how to troubleshoot this?

Feb 12 10:48:12 (none) kernel: turbonet2: call log: HTTP/1.1 200 OK
Feb 12 10:48:28 (none) kernel: About to check tasks for tty to shutdown
Feb 12 10:48:28 (none) kernel: This one's (152) goin' down
Feb 12 10:49:19 (none) kernel: In SourceManager::AddDirectories, pid = 129
Feb 12 10:52:44 (none) kernel: Tmk Assertion Failure:
Feb 12 10:52:44 (none) kernel: AssertValidPointer, line 2377 ()
Feb 12 10:52:44 (none) kernel: Tmk Fatal Error: Thread PhoneHome event hdlr <129> died due to signal -2
I'm getting a sinking feeling that my extra hack partition is to blame...