Same thing. Last 10 seconds, there's a hang that lasts for about 15 minutes. It does not exactly coincide with:
Oct 1 18:58:10 mingisapsycho com.apple.mdworker.isolation.0[797]: Incorrect start/end range ordering; fixing.
Oct 1 18:58:49 mingisapsycho com.apple.mdworker.pool.0[787]: I/O error : encoder error
Oct 1 18:58:50 mingisapsycho mdworker[790]: Unable to talk to lsboxd
But that's when the hangs begin. During the hang mds and mdworker aren't doing much of anything. mds uses 0.2% CPU and a sample report indicates it's mostly hung on libsystem_kernel.dylib. I think we've got a bug. I don't think in every instance this 10.7.5 and 10.8.2 Spotlight issue is about bad importers. I've eliminated that as a possibility, unless of course, one of Apple's own importers has gone bad.
Anyway, blowing away the folders in /var/folders, then rebooting, and then either 'mdutil -E /' or adding your Mac OS volume in privacy to prevent searches, then promptly removing it, appears to fix the problem. For me.
Previously, I was waiting 3 days for rebuilds that still said (variably) 5 days to 5 weeks to complete. Today it took ~45 minutes after doing the above.
Sample report for mds when "hung" 2602 Thread_737 DispatchQueue_1: com.apple.main-thread (serial)
+ 2602 ??? (in mds) load address 0x1097e5000 + 0x4444 [0x1097e9444]
+ 2602 ??? (in mds) load address 0x1097e5000 + 0xdbf9 [0x1097f2bf9]
+ 2602 CFRunLoopRunSpecific (in CoreFoundation) + 230 [0x7fff83db5486]
+ 2602 __CFRunLoopRun (in CoreFoundation) + 1204 [0x7fff83db5c74]
+ 2602 __CFRunLoopServiceMachPort (in CoreFoundation) + 188 [0x7fff83dad50c]
+ 2602 mach_msg (in libsystem_kernel.dylib) + 73 [0x7fff8d2b5d71]
+ 2602 mach_msg_trap (in libsystem_kernel.dylib) + 10 [0x7fff8d2b667a]
2602 Thread_797 DispatchQueue_2: com.apple.libdispatch-manager (serial)
+ 2602 _dispatch_mgr_thread (in libdispatch.dylib) + 54 [0x7fff82f3d316]
+ 2599 _dispatch_mgr_invoke (in libdispatch.dylib) + 923 [0x7fff82f3e786]
+ ! 2599 kevent (in libsystem_kernel.dylib) + 10 [0x7fff8d2b87e6]
+ 2 _dispatch_mgr_invoke (in libdispatch.dylib) + 926,923 [0x7fff82f3e789,0x7fff82f3e786]
+ 1 _dispatch_mgr_invoke (in libdispatch.dylib) + 931 [0x7fff82f3e78e]
+ 1 __error (in libsystem_c.dylib) + 0 [0x7fff89b6ac88]
2602 Thread_862
+ 2602 thread_start (in libsystem_c.dylib) + 13 [0x7fff89b19b75]
+ 2602 _pthread_start (in libsystem_c.dylib) + 335 [0x7fff89b168bf]
+ 2602 ??? (in mds) load address 0x1097e5000 + 0x962f [0x1097ee62f]
+ 2602 read (in libsystem_kernel.dylib) + 10 [0x7fff8d2b8af2]
2602 Thread_143919
+ 2602 start_wqthread (in libsystem_c.dylib) + 13 [0x7fff89b19b85]
+ 2602 _pthread_wqthread (in libsystem_c.dylib) + 758 [0x7fff89b18594]
+ 2602 __workq_kernreturn (in libsystem_kernel.dylib) + 10 [0x7fff8d2b8192]
2602 Thread_145921
+ 2602 start_wqthread (in libsystem_c.dylib) + 13 [0x7fff89b19b85]
+ 2602 _pthread_wqthread (in libsystem_c.dylib) + 758 [0x7fff89b18594]
+ 2602 __workq_kernreturn (in libsystem_kernel.dylib) + 10 [0x7fff8d2b8192]
2212 Thread_146823
+ 2212 start_wqthread (in libsystem_c.dylib) + 13 [0x7fff89b19b85]
+ 2211 _pthread_wqthread (in libsystem_c.dylib) + 758 [0x7fff89b18594]
+ ! 2211 __workq_kernreturn (in libsystem_kernel.dylib) + 10 [0x7fff8d2b8192]
+ 1 _pthread_wqthread (in libsystem_c.dylib) + 763 [0x7fff89b18599]
345 Thread_146872
345 start_wqthread (in libsystem_c.dylib) + 13 [0x7fff89b19b85]
345 _pthread_wqthread (in libsystem_c.dylib) + 758 [0x7fff89b18594]
345 __workq_kernreturn (in libsystem_kernel.dylib) + 10 [0x7fff8d2b8192]