Update: workaround found. See here.

Has anybody other than me seen this screen before?

It comes up every few minutes when I'm using my MacBook intensely. Just what the hell is upgradedb and why is it "quitting unexpectedly"? Neither a Google search nor a search on the Apple support site brings up anything useful ...

Here is what the crash reporting tool says:

Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000000
Crashed Thread:  0

Thread 0 Crashed:
0   upgradedb                     	0x0007a66d 0x1000 + 497261
1   upgradedb                     	0x0007a29d 0x1000 + 496285
2   upgradedb                     	0x00079741 0x1000 + 493377
3   upgradedb                     	0x000797eb 0x1000 + 493547
4   upgradedb                     	0x0003c7fd 0x1000 + 243709
5   upgradedb                     	0x00005c1d 0x1000 + 19485
6   upgradedb                     	0x00006ce0 0x1000 + 23776
7   upgradedb                     	0x00008340 0x1000 + 29504
8   upgradedb                     	0x000095ca 0x1000 + 34250
9   upgradedb                     	0x000022b2 0x1000 + 4786

Thread 0 crashed with X86 Thread State (32-bit):
  eax: 0x0007a613  ebx: 0x0007a627  ecx: 0x00000000  edx: 0x00000000
  edi: 0x00132580  esi: 0x00132580  ebp: 0xbffff498  esp: 0xbffff470
   ss: 0x0000001f  efl: 0x00010202  eip: 0x0007a66d   cs: 0x00000017
   ds: 0x0000001f   es: 0x0000001f   fs: 0x00000000   gs: 0x00000037
  cr2: 0x00000000

Binary Images:
    0x1000 -    0xb4fff  upgradedb ??? (???) <1549a635696db0a1981dc00497a55461> /System/Library/Frameworks/SyncServices.framework/Versions/Current/Resources/SyncServer.app/Contents/Resources/upgradedb