If a dropDatabase command occurs some time during the M/R, mongo segv.

Thu Apr 21 13:26:28 [conn3542956] CMD: drop TEST_SHARED.mr.mapreduce_1303392388_1431534
Thu Apr 21 13:26:28 [conn3542956] CMD: drop TEST_SHARED.mr.mapreduce_1303392388_1431534_inc
Thu Apr 21 13:26:28 [conn3542956] building new index on

{ 0: 1 }

for TEST_SHARED.mr.mapreduce_1303392388_1431534_inc
Thu Apr 21 13:26:28 [conn3542956] done for 1 records 0secs
Thu Apr 21 13:26:28 [conn3542956] building new index on

{ _id: 1 }

for TEST_SHARED.mr.mapreduce_1303392388_1431534
Thu Apr 21 13:26:28 [conn3542956] done for 0 records 0secs
Thu Apr 21 13:26:28 [conn3543826] dropDatabase TEST_SHARED
Thu Apr 21 13:26:30 [conn3543826] query TEST_SHARED.$cmd ntoreturn:1 command:

{ dropDatabase: 1 }

reslen:78 1926ms
Thu Apr 21 13:26:30 allocating new datafile /data/db/TEST_SHARED.ns, filling with zeroes...
Thu Apr 21 13:26:30 done allocating datafile /data/db/TEST_SHARED.ns, size: 16MB, took 0 secs
Thu Apr 21 13:26:30 allocating new datafile /data/db/TEST_SHARED.0, filling with zeroes...
Thu Apr 21 13:26:30 done allocating datafile /data/db/TEST_SHARED.0, size: 64MB, took 0 secs
Thu Apr 21 13:26:30 allocating new datafile /data/db/TEST_SHARED.1, filling with zeroes...
Thu Apr 21 13:26:30 done allocating datafile /data/db/TEST_SHARED.1, size: 128MB, took 0 secs
Thu Apr 21 13:26:30 [conn3542956] building new index on

{ _id: 1 }

for TEST_SHARED.mr.mapreduce_1303392388_1431534
Thu Apr 21 13:26:30 [conn3542956] done for 0 records 0secs
Thu Apr 21 13:26:30 [conn3542956] TEST_SHARED.mr.mapreduce_1303392388_1431534_inc Assertion failure pos != -2 db/clientcursor.cpp 217