Hello! I got the strange error first reported as "External module not found", but after putting a few diagnostic transcript outputs to the code: TowergameSyncTests >> setUp Transcript cr; show: self; cr; show: 'ENTER setUp'; cr. dao := Towergame daoForLogin: self loginToTemporaryDatabase. session := dao glorpSession. Transcript cr; show: 'LEAVE setUp'; cr. TowergameSyncTests >> tearDown Transcript cr; show: 'ENTER tearDown'; cr. session logout. Transcript cr; show: 'LEAVE tearDown'; cr. I got this in an (excerpt of an) output in my Go CD agent. It runs on 32bit Ubuntu 16.04.3, uses 61+vm: 13:10:58.277 [go] Start to execute task: Plugin with ID: script-executor. 13:10:58.295 [script-executor] OS detected: 'Linux'. Is Windows? false 13:10:58.313 [script-executor] Script written into '/var/lib/go-agent/pipelines/filmtower-srv/cffa4492-a817-41e0-bb64-72a9e5a3d890.sh'. 13:10:58.325 + cd code 13:10:58.325 + ../pharo/pharo ./filmtower.image conf/run-tests.st 13:10:58.866 13:10:58.867 TowergameServerTests 13:10:58.961 4 run, 4 passes, 0 skipped, 0 expected failures, 0 failures, 0 errors, 0 unexpected passes 13:10:58.962 13:10:58.962 TowergameSyncTests 13:10:58.962 13:10:58.962 TowergameSyncTests>>#testPlayerCanHaveDisabledDeviceSaved 13:10:58.962 ENTER setUp 13:10:58.991 13:10:58.991 ENTER tearDown 13:10:58.994 13:10:58.995 TowergameSyncTests>>#testPlayerChecksStateVersion 13:10:58.995 ENTER setUp 13:10:59.000 13:10:59.000 ENTER tearDown 13:10:59.001 13:10:59.002 TowergameSyncTests>>#testPlayerChecksStateVersionAndHasFreshlyInstalled 13:10:59.002 ENTER setUp 13:10:59.014 13:10:59.015 ENTER tearDown 13:10:59.015 13:10:59.021 TowergameSyncTests>>#testPlayerChecksStateVersionAndIsBehind 13:10:59.021 ENTER setUp 13:10:59.031 Error: External module not found 13:10:59.031 ExternalLibraryFunction(Object)>>error: 13:10:59.033 ExternalLibraryFunction(Object)>>externalCallFailed 13:10:59.034 ExternalLibraryFunction(ExternalFunction)>>invokeWithArguments: 13:10:59.034 UDBCSQLite3DatabaseExternalObject class>>finalizeResourceData: 13:10:59.035 FFICalloutAPI>>function:module: 13:10:59.035 UDBCSQLite3Library(Object)>>ffiCall:module: 13:10:59.036 UDBCSQLite3DatabaseExternalObject class>>finalizeResourceData: 13:10:59.036 FFIExternalResourceExecutor>>finalize 13:10:59.036 WeakFinalizerItem>>finalizeValues 13:10:59.059 [ each finalizeValues ] in [ :each | [ each finalizeValues ] on: Exception fork: [ :ex | ex pass ] ] in WeakRegistry>>finalizeValues in Block: [ each finalizeValues ] 13:10:59.059 BlockClosure>>on:do: 13:10:59.079 [ Processor terminateActive ] in [ :ex | 13:10:59.079 | copy onDoCtx process handler bottom thisCtx | 13:10:59.079 onDoCtx := thisContext. 13:10:59.079 thisCtx := onDoCtx home. 13:10:59.079 13:10:59.079 "find the context on stack for which this method's is sender" 13:10:59.079 [ onDoCtx sender == thisCtx ] 13:10:59.079 whileFalse: [ onDoCtx := onDoCtx sender. 13:10:59.079 onDoCtx 13:10:59.079 ifNil: [ "Can't find our home context. seems like we're already forked 13:10:59.079 and handling another exception in new thread. In this case, just pass it through handler." ^ handlerAction cull: ex ] ]. 13:10:59.079 bottom := [ Processor terminateActive ] asContext. 13:10:59.079 onDoCtx privSender: bottom. 13:10:59.079 handler := [ handlerAction cull: ex ] asContext. 13:10:59.080 handler privSender: thisContext sender. 13:10:59.081 (Process forContext: handler priority: Processor activePriority) 13:10:59.081 resume. 13:10:59.081 13:10:59.081 "cut the stack of current process" 13:10:59.081 thisContext privSender: thisCtx. 13:10:59.082 nil ] in BlockClosure>>on:fork: in Block: [ Processor terminateActive ] 13:10:59.226 13:10:59.228 [script-executor] Script completed with exit code: 1. 13:10:59.285 [go] Current job status: failed. There are two dimensions to this: 1. It is not "External module not found" as far as I can say, as a few tests passed, going through both setUp and tearDown. Something is wrong when finalizers kick in. FWIW, the login I use to log in the test db, created anew each time, because it is SQLite temp db, is: TowergameSyncTests >> loginToTemporaryDatabase ^ Login new database: UDBCSQLite3Platform new; host: ''; port: ''; username: ''; password: ''; databaseName: ''; yourself If I understood correctly, it creates db backed by temp file which gets removed once connection closes. Everything works fine in my dev machine (Win 10, non-headless), where tests just pass fine. 2. Where are "LEAVE setUp" and "LEAVE tearDown" messages? They are missing from the transcipt (again, on dev machine, in non-headless mode, they show up in the Transcript window). Can someone hint at what is wrong / udbcsqlite authors look at if there isn't something incorrect in the sqlite driver / library? I don't know what to do in this state. It seems it should just work. (I can upload the image somewhere if you're interested). Thanks, Herby P.S.: I tried on 64-bit linux (Ubuntu 14.04) with get.pharo.org/64/61+vm, and ran things that Go CD job does by hand. The output is the same (few tests run, then finalizers crash the image). P.P.S.: When tried again and again trying just the last line (... run-tests.st), it consistently crashes the same way.