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Type:
Bug
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Resolution: Done
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Priority:
Major - P3
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Affects Version/s: 2.4.8
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Component/s: JavaScript
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Environment:> db.serverBuildInfo()
{
"version" : "2.4.8",
"gitVersion" : "a350fc38922fbda2cec8d5dd842237b904eafc14",
"sysInfo" : "Darwin bs-osx-106-x86-64-2.10gen.cc 10.8.0 Darwin Kernel Version 10.8.0: Tue Jun 7 16:32:41 PDT 2011; root:xnu-1504.15.3~1/RELEASE_X86_64 x86_64 BOOST_LIB_VERSION=1_49",
"loaderFlags" : "-fPIC -pthread -rdynamic -m64",
"compilerFlags" : "-Wnon-virtual-dtor -Woverloaded-virtual -fPIC -fno-strict-aliasing -ggdb -pthread -Wall -Wsign-compare -Wno-unknown-pragmas -Winvalid-pch -O3 -m64",
"allocator" : "system",
"versionArray" : [
2,
4,
8,
0
],
"javascriptEngine" : "V8",
"bits" : 64,
"debug" : false,
"maxBsonObjectSize" : 16777216,
"ok" : 1
}> db.serverBuildInfo() { "version" : "2.4.8", "gitVersion" : "a350fc38922fbda2cec8d5dd842237b904eafc14", "sysInfo" : "Darwin bs-osx-106-x86-64-2.10gen.cc 10.8.0 Darwin Kernel Version 10.8.0: Tue Jun 7 16:32:41 PDT 2011; root:xnu-1504.15.3~1/RELEASE_X86_64 x86_64 BOOST_LIB_VERSION=1_49", "loaderFlags" : "-fPIC -pthread -rdynamic -m64", "compilerFlags" : "-Wnon-virtual-dtor -Woverloaded-virtual -fPIC -fno-strict-aliasing -ggdb -pthread -Wall -Wsign-compare -Wno-unknown-pragmas -Winvalid-pch -O3 -m64", "allocator" : "system", "versionArray" : [ 2, 4, 8, 0 ], "javascriptEngine" : "V8", "bits" : 64, "debug" : false, "maxBsonObjectSize" : 16777216, "ok" : 1 }
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ALL
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ISSUE SUMMARY
$where can cause a segfault when used inside an $elemMatch
USER IMPACT
Mongod will crash with a stack trace showing an error in the mongo::Matcher::parseWhere method, similar to the following
Fri Nov 15 19:34:35.259 Backtrace: 0x10044c60b 0x100001121 0x1000013a2 0x7fff979285aa 0 0x10021a733 0x10021d43b 0x10021dcb9 0x10021e657 0x10021c14e 0x10021d619 0x10021dcb9 0x1002b472a 0x1002b2628 0x1002a7464 0x1002dbcf2 0x100240b14 0x1001ee10f 0x10000b682 0x100441fd9 0 mongod 0x000000010044c60b _ZN5mongo15printStackTraceERSo + 43 1 mongod 0x0000000100001121 _ZN5mongo10abruptQuitEi + 225 2 mongod 0x00000001000013a2 _ZN5mongo24abruptQuitWithAddrSignalEiP9__siginfoPv + 242 3 libsystem_platform.dylib 0x00007fff979285aa _sigtramp + 26 4 ??? 0x0000000000000000 0x0 + 0 5 mongod 0x000000010021a733 _ZN5mongo7Matcher10parseWhereERKNS_11BSONElementE + ...
SOLUTION
Mongod now returns the following error message when $where is used inside an $elemMatch
no valid context found for $where
WORKAROUNDS
Users should avoid using $where inside an $elemMatch.
PATCHES
Production release v2.4.9 and v2.2.7 contain the fix for this issue, and production release v2.6.0 will have a brand new query engine, which does not contain this bug.
problem: mongod 2.4.8 crashes with a segmentation fault when doing a $where inside of a $elemMatch. This appears to be fixed in versions 2.5.x.
mongod log attached
- is related to
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- Closed
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- related to
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- Closed
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