Here's another one-off crash in dovecot-2.0.3's auth process. Looks
like request->mech == NULL in auth_request_initial(). I don't see any
obvious fixes to this code between 2.0.3 and 2.0.6 so it may still be present in
2.0.6.
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000018
0 auth 0x000000010d89381b auth_request_initial
+ 85
1 auth 0x000000010d891844
auth_penalty_anvil_callback + 207
2 libdovecot.0.dylib 0x000000010d8ea44f anvil_client_connect
+ 364
3 libdovecot.0.dylib 0x000000010d8f77e9 io_loop_handler_run +
234
4 libdovecot.0.dylib 0x000000010d8f82bb io_loop_run + 56
5 libdovecot.0.dylib 0x000000010d8edf98 master_service_run +
27
6 auth 0x000000010d89b18a main + 674
7 auth 0x000000010d88ec14 start + 52
There were several "Timeout waiting for handshake from auth server"
errors from imap-login and pop3-login in the minutes before this crash.
