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  1. Core Server
  2. SERVER-12426

explain results with specific query on certain data crashes shell

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2.5.5
    • Component/s: Querying
    • Labels:
    • Backwards Compatibility:
      Fully Compatible
    • Operating System:
      ALL

      Description

      Updated description:

      To trigger this issue, run any query that involves an indexed query with a timestamp in the predicate. This will generate an index interval with max(timestamp) as the upper bound. Currently, the query framework gets max(timestamp) from BSONObjBuilder::appendMaxForType() which defines max(timestamp) as max(uint32_t) seconds since epoch.

      Unfortunately, the shell can only display timestamps up to the year 2039 (slightly less than max(int32_t) and crashes when it tries to convert any timestamp from the server larger than that.

      The Fix: updated max(timestamp) in both server and shell to be max(int32_t) seconds.

      ------
      Note that despite the query not returning anything, I have been only been able to reproduce this against the data attached to this ticket. The results from this query + explain will crash the shell on both master (git hash: f65a0b814b8c77e3fbe90bca0c061c9b77f6acdb) and 2.4.9 (using either shell).

      > use test
      switched to db test
      > db.version()
      2.5.5-pre-
      > db.test3.find({_id: {"$type": 17}}).explain()
      {
              "cursor" : "BasicCursor",
              "isMultiKey" : false,
              "n" : 0,
              "nscannedObjects" : 0,
              "nscanned" : 0,
              "nscannedObjectsAllPlans" : 0,
              "nscannedAllPlans" : 0,
              "scanAndOrder" : false,
              "indexOnly" : false,
              "nYields" : 0,
              "nChunkSkips" : 0,
              "millis" : 0,
              "server" : "Andrew-Emil-MacBook-Pro.local:27018"
      }
      > use qry
      switched to db qry
      > db.test3.find({_id: {"$type": 17}})
      > db.test3.find({_id: {"$type": 17}}).explain()
      mongo got signal 11 (Segmentation fault: 11), stack trace:
      0x10013583b 0x1000018e9 0x7fff92ba994a 0x7fff5fbfd428 0x1001d38eb 0x1000b6a20 0x1000b6a12 0x1000b4a35 0x100334b8c 0x1003345f2 0x10037a972 0x1210a9b06362 0x1210a9b1701e
       0   mongo                               0x000000010013583b _ZN5mongo15printStackTraceERSo + 43
       1   mongo                               0x00000001000018e9 _Z12quitAbruptlyi + 217
       2   libsystem_c.dylib                   0x00007fff92ba994a _sigtramp + 26
       3   ???                                 0x00007fff5fbfd428 0x0 + 140734799795240
       4   mongo                               0x00000001001d38eb _ZN2v86Object3SetEjNS_6HandleINS_5ValueEEE + 283
       5   mongo                               0x00000001000b6a20 _ZN5mongo7V8Scope16mongoToV8ElementERKNS_11BSONElementEb + 1048
       6   mongo                               0x00000001000b6a12 _ZN5mongo7V8Scope16mongoToV8ElementERKNS_11BSONElementEb + 1034
       7   mongo                               0x00000001000b4a35 _ZN5mongoL8namedGetEN2v85LocalINS0_6StringEEERKNS0_12AccessorInfoE + 629
       8   mongo                               0x0000000100334b8c _ZN2v88internal8JSObject35GetPropertyAttributeWithInterceptorEPS1_PNS0_6StringEb + 822
       9   mongo                               0x00000001003345f2 _ZN2v88internal10JSReceiver32GetPropertyAttributeWithReceiverEPS1_PNS0_6StringE + 252
       10  mongo                               0x000000010037a972 _ZN2v88internal19Runtime_HasPropertyENS0_9ArgumentsEPNS0_7IsolateE + 114
       11  ???                                 0x00001210a9b06362 0x0 + 19862775685986
       12  ???                                 0x00001210a9b1701e 0x0 + 19862775754782

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              • Created:
                Updated:
                Resolved: