./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursive/Ackermann03.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Ackermann03.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash c244f72db2906c596b7f122d769fc1464836d7d05d9227ee4269773d59ed10bd --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 14:19:34,693 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 14:19:34,764 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Overflow-32bit-Taipan_Default.epf [2023-12-02 14:19:34,769 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 14:19:34,770 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 14:19:34,796 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 14:19:34,797 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 14:19:34,798 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 14:19:34,798 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 14:19:34,799 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 14:19:34,799 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 14:19:34,800 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 14:19:34,800 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 14:19:34,801 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 14:19:34,801 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 14:19:34,802 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 14:19:34,802 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 14:19:34,803 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 14:19:34,803 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 14:19:34,804 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 14:19:34,804 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 14:19:34,805 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 14:19:34,806 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 14:19:34,806 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 14:19:34,807 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 14:19:34,807 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 14:19:34,808 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 14:19:34,808 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 14:19:34,808 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 14:19:34,809 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 14:19:34,809 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 14:19:34,810 INFO L153 SettingsManager]: * Check absence of signed integer overflows=true [2023-12-02 14:19:34,810 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-12-02 14:19:34,810 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 14:19:34,810 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 14:19:34,811 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 14:19:34,811 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 14:19:34,811 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 14:19:34,811 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 14:19:34,811 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:19:34,812 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 14:19:34,812 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 14:19:34,812 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 14:19:34,813 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 14:19:34,813 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 14:19:34,813 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 14:19:34,813 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 14:19:34,813 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 14:19:34,814 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 14:19:34,814 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c244f72db2906c596b7f122d769fc1464836d7d05d9227ee4269773d59ed10bd [2023-12-02 14:19:35,043 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 14:19:35,063 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 14:19:35,066 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 14:19:35,067 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 14:19:35,068 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 14:19:35,069 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/recursive/Ackermann03.c [2023-12-02 14:19:37,852 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 14:19:38,022 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 14:19:38,023 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/sv-benchmarks/c/recursive/Ackermann03.c [2023-12-02 14:19:38,029 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/data/dc8fbc983/63c6b94c7b764b46a8b32c3b712d3588/FLAG41780dc2f [2023-12-02 14:19:38,042 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/data/dc8fbc983/63c6b94c7b764b46a8b32c3b712d3588 [2023-12-02 14:19:38,045 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 14:19:38,047 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 14:19:38,048 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 14:19:38,049 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 14:19:38,053 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 14:19:38,053 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:19:38" (1/1) ... [2023-12-02 14:19:38,054 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@259a9a80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:19:38, skipping insertion in model container [2023-12-02 14:19:38,055 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:19:38" (1/1) ... [2023-12-02 14:19:38,072 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 14:19:38,200 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:19:38,210 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 14:19:38,225 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:19:38,237 INFO L206 MainTranslator]: Completed translation [2023-12-02 14:19:38,237 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:19:38 WrapperNode [2023-12-02 14:19:38,237 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 14:19:38,238 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 14:19:38,238 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 14:19:38,238 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 14:19:38,244 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:19:38" (1/1) ... [2023-12-02 14:19:38,250 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:19:38" (1/1) ... [2023-12-02 14:19:38,265 INFO L138 Inliner]: procedures = 13, calls = 12, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 34 [2023-12-02 14:19:38,265 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 14:19:38,265 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 14:19:38,266 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 14:19:38,266 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 14:19:38,272 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:19:38" (1/1) ... [2023-12-02 14:19:38,272 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:19:38" (1/1) ... [2023-12-02 14:19:38,274 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:19:38" (1/1) ... [2023-12-02 14:19:38,274 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:19:38" (1/1) ... [2023-12-02 14:19:38,277 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:19:38" (1/1) ... [2023-12-02 14:19:38,279 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:19:38" (1/1) ... [2023-12-02 14:19:38,281 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:19:38" (1/1) ... [2023-12-02 14:19:38,281 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:19:38" (1/1) ... [2023-12-02 14:19:38,283 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 14:19:38,284 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 14:19:38,284 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 14:19:38,285 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 14:19:38,285 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:19:38" (1/1) ... [2023-12-02 14:19:38,292 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:19:38,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:19:38,315 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 14:19:38,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 14:19:38,348 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 14:19:38,348 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 14:19:38,348 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 14:19:38,348 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2023-12-02 14:19:38,348 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2023-12-02 14:19:38,349 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 14:19:38,416 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 14:19:38,419 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 14:19:38,564 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 14:19:38,597 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 14:19:38,598 INFO L309 CfgBuilder]: Removed 0 assume(true) statements. [2023-12-02 14:19:38,599 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:19:38 BoogieIcfgContainer [2023-12-02 14:19:38,600 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 14:19:38,603 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 14:19:38,603 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 14:19:38,607 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 14:19:38,608 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 02:19:38" (1/3) ... [2023-12-02 14:19:38,608 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46ef4323 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:19:38, skipping insertion in model container [2023-12-02 14:19:38,609 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:19:38" (2/3) ... [2023-12-02 14:19:38,609 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46ef4323 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:19:38, skipping insertion in model container [2023-12-02 14:19:38,609 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:19:38" (3/3) ... [2023-12-02 14:19:38,611 INFO L112 eAbstractionObserver]: Analyzing ICFG Ackermann03.c [2023-12-02 14:19:38,628 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 14:19:38,628 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 8 error locations. [2023-12-02 14:19:38,674 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 14:19:38,680 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@43b1cd8b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 14:19:38,681 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2023-12-02 14:19:38,684 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 20 states have (on average 1.6) internal successors, (32), 28 states have internal predecessors, (32), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 14:19:38,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 14:19:38,690 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:38,691 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:38,691 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:38,696 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:38,697 INFO L85 PathProgramCache]: Analyzing trace with hash -2118177911, now seen corresponding path program 1 times [2023-12-02 14:19:38,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:38,705 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491881754] [2023-12-02 14:19:38,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:38,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:38,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:38,904 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:19:38,904 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:38,905 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491881754] [2023-12-02 14:19:38,905 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491881754] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:19:38,906 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:19:38,906 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 14:19:38,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124399982] [2023-12-02 14:19:38,908 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:19:38,911 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:19:38,911 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:38,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:19:38,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 14:19:38,942 INFO L87 Difference]: Start difference. First operand has 34 states, 20 states have (on average 1.6) internal successors, (32), 28 states have internal predecessors, (32), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:39,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:39,094 INFO L93 Difference]: Finished difference Result 64 states and 77 transitions. [2023-12-02 14:19:39,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 14:19:39,097 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-12-02 14:19:39,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:39,106 INFO L225 Difference]: With dead ends: 64 [2023-12-02 14:19:39,107 INFO L226 Difference]: Without dead ends: 58 [2023-12-02 14:19:39,110 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:19:39,114 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 50 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:39,115 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 101 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:19:39,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-12-02 14:19:39,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 50. [2023-12-02 14:19:39,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 41 states have internal predecessors, (51), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 14:19:39,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2023-12-02 14:19:39,166 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 7 [2023-12-02 14:19:39,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:39,167 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2023-12-02 14:19:39,167 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:39,167 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2023-12-02 14:19:39,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-12-02 14:19:39,168 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:39,168 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:39,168 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 14:19:39,169 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:39,169 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:39,170 INFO L85 PathProgramCache]: Analyzing trace with hash -1239000740, now seen corresponding path program 1 times [2023-12-02 14:19:39,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:39,170 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898142267] [2023-12-02 14:19:39,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:39,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:39,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:39,250 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:19:39,251 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:39,251 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898142267] [2023-12-02 14:19:39,251 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [898142267] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:19:39,251 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:19:39,252 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 14:19:39,252 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949287564] [2023-12-02 14:19:39,252 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:19:39,253 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:19:39,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:39,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:19:39,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 14:19:39,255 INFO L87 Difference]: Start difference. First operand 50 states and 64 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:39,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:39,341 INFO L93 Difference]: Finished difference Result 100 states and 136 transitions. [2023-12-02 14:19:39,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 14:19:39,342 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-12-02 14:19:39,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:39,345 INFO L225 Difference]: With dead ends: 100 [2023-12-02 14:19:39,345 INFO L226 Difference]: Without dead ends: 94 [2023-12-02 14:19:39,346 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:19:39,347 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 48 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:39,348 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 92 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:19:39,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2023-12-02 14:19:39,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 84. [2023-12-02 14:19:39,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 60 states have (on average 1.5166666666666666) internal successors, (91), 69 states have internal predecessors, (91), 13 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-12-02 14:19:39,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 114 transitions. [2023-12-02 14:19:39,372 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 114 transitions. Word has length 8 [2023-12-02 14:19:39,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:39,373 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 114 transitions. [2023-12-02 14:19:39,373 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:39,373 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 114 transitions. [2023-12-02 14:19:39,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-12-02 14:19:39,374 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:39,374 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:39,374 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 14:19:39,375 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:39,376 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:39,376 INFO L85 PathProgramCache]: Analyzing trace with hash -1239005737, now seen corresponding path program 1 times [2023-12-02 14:19:39,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:39,377 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832002197] [2023-12-02 14:19:39,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:39,377 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:39,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:39,459 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:19:39,459 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:39,460 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832002197] [2023-12-02 14:19:39,460 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1832002197] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:19:39,460 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:19:39,460 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 14:19:39,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761321768] [2023-12-02 14:19:39,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:19:39,461 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:19:39,461 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:39,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:19:39,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 14:19:39,462 INFO L87 Difference]: Start difference. First operand 84 states and 114 transitions. Second operand has 5 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:39,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:39,545 INFO L93 Difference]: Finished difference Result 113 states and 151 transitions. [2023-12-02 14:19:39,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 14:19:39,546 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-12-02 14:19:39,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:39,548 INFO L225 Difference]: With dead ends: 113 [2023-12-02 14:19:39,548 INFO L226 Difference]: Without dead ends: 109 [2023-12-02 14:19:39,549 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:19:39,551 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 49 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:39,551 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 86 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:19:39,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2023-12-02 14:19:39,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 101. [2023-12-02 14:19:39,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 73 states have (on average 1.452054794520548) internal successors, (106), 82 states have internal predecessors, (106), 16 states have call successors, (16), 5 states have call predecessors, (16), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-12-02 14:19:39,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 135 transitions. [2023-12-02 14:19:39,571 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 135 transitions. Word has length 8 [2023-12-02 14:19:39,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:39,572 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 135 transitions. [2023-12-02 14:19:39,572 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:39,572 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 135 transitions. [2023-12-02 14:19:39,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 14:19:39,573 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:39,573 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:39,573 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-12-02 14:19:39,573 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ackermannErr3ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:39,574 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:39,574 INFO L85 PathProgramCache]: Analyzing trace with hash 245682796, now seen corresponding path program 1 times [2023-12-02 14:19:39,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:39,574 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [519067045] [2023-12-02 14:19:39,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:39,575 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:39,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:39,630 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:19:39,630 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:39,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [519067045] [2023-12-02 14:19:39,631 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [519067045] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:19:39,631 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:19:39,631 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 14:19:39,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091412473] [2023-12-02 14:19:39,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:19:39,632 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:19:39,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:39,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:19:39,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 14:19:39,633 INFO L87 Difference]: Start difference. First operand 101 states and 135 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:39,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:39,686 INFO L93 Difference]: Finished difference Result 101 states and 135 transitions. [2023-12-02 14:19:39,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 14:19:39,687 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-12-02 14:19:39,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:39,688 INFO L225 Difference]: With dead ends: 101 [2023-12-02 14:19:39,688 INFO L226 Difference]: Without dead ends: 99 [2023-12-02 14:19:39,689 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:19:39,691 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 42 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:39,692 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 40 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:19:39,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-12-02 14:19:39,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2023-12-02 14:19:39,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 73 states have (on average 1.3150684931506849) internal successors, (96), 80 states have internal predecessors, (96), 16 states have call successors, (16), 5 states have call predecessors, (16), 4 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-12-02 14:19:39,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 125 transitions. [2023-12-02 14:19:39,708 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 125 transitions. Word has length 9 [2023-12-02 14:19:39,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:39,709 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 125 transitions. [2023-12-02 14:19:39,709 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:39,709 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 125 transitions. [2023-12-02 14:19:39,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-12-02 14:19:39,710 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:39,710 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:39,710 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 14:19:39,710 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:39,711 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:39,711 INFO L85 PathProgramCache]: Analyzing trace with hash -1896410727, now seen corresponding path program 1 times [2023-12-02 14:19:39,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:39,712 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105637544] [2023-12-02 14:19:39,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:39,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:39,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:39,766 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:19:39,766 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:39,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105637544] [2023-12-02 14:19:39,767 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105637544] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:19:39,767 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:19:39,767 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 14:19:39,767 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445616509] [2023-12-02 14:19:39,768 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:19:39,768 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:19:39,768 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:39,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:19:39,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 14:19:39,770 INFO L87 Difference]: Start difference. First operand 99 states and 125 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:39,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:39,831 INFO L93 Difference]: Finished difference Result 167 states and 220 transitions. [2023-12-02 14:19:39,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 14:19:39,831 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-12-02 14:19:39,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:39,833 INFO L225 Difference]: With dead ends: 167 [2023-12-02 14:19:39,833 INFO L226 Difference]: Without dead ends: 96 [2023-12-02 14:19:39,835 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-02 14:19:39,837 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 26 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:39,838 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 82 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:19:39,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2023-12-02 14:19:39,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2023-12-02 14:19:39,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 70 states have (on average 1.3) internal successors, (91), 77 states have internal predecessors, (91), 15 states have call successors, (15), 5 states have call predecessors, (15), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-12-02 14:19:39,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 118 transitions. [2023-12-02 14:19:39,854 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 118 transitions. Word has length 14 [2023-12-02 14:19:39,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:39,855 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 118 transitions. [2023-12-02 14:19:39,855 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:39,855 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 118 transitions. [2023-12-02 14:19:39,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-12-02 14:19:39,856 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:39,856 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:39,856 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 14:19:39,857 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ackermannErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:39,857 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:39,858 INFO L85 PathProgramCache]: Analyzing trace with hash -1896410503, now seen corresponding path program 1 times [2023-12-02 14:19:39,858 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:39,858 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799350737] [2023-12-02 14:19:39,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:39,858 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:39,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:39,939 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:19:39,939 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:39,939 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [799350737] [2023-12-02 14:19:39,940 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [799350737] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:19:39,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1691966348] [2023-12-02 14:19:39,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:39,940 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:39,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:19:39,942 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:19:39,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 14:19:39,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:39,994 INFO L262 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 14:19:39,997 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:19:40,051 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:19:40,051 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:19:40,128 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:19:40,129 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1691966348] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:19:40,129 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1577453716] [2023-12-02 14:19:40,148 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-12-02 14:19:40,148 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:19:40,153 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:19:40,154 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:19:40,155 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2023-12-02 14:19:40,155 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206718384] [2023-12-02 14:19:40,155 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:19:40,155 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-12-02 14:19:40,156 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:40,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-12-02 14:19:40,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2023-12-02 14:19:40,157 INFO L87 Difference]: Start difference. First operand 95 states and 118 transitions. Second operand has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:40,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:40,492 INFO L93 Difference]: Finished difference Result 273 states and 355 transitions. [2023-12-02 14:19:40,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 14:19:40,492 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-12-02 14:19:40,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:40,496 INFO L225 Difference]: With dead ends: 273 [2023-12-02 14:19:40,496 INFO L226 Difference]: Without dead ends: 271 [2023-12-02 14:19:40,497 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2023-12-02 14:19:40,498 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 308 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 314 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:40,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [314 Valid, 175 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:19:40,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2023-12-02 14:19:40,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 235. [2023-12-02 14:19:40,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 181 states have (on average 1.2651933701657458) internal successors, (229), 188 states have internal predecessors, (229), 36 states have call successors, (36), 13 states have call predecessors, (36), 12 states have return successors, (33), 33 states have call predecessors, (33), 33 states have call successors, (33) [2023-12-02 14:19:40,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 298 transitions. [2023-12-02 14:19:40,554 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 298 transitions. Word has length 14 [2023-12-02 14:19:40,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:40,555 INFO L495 AbstractCegarLoop]: Abstraction has 235 states and 298 transitions. [2023-12-02 14:19:40,555 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:40,555 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 298 transitions. [2023-12-02 14:19:40,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-12-02 14:19:40,556 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:40,556 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:40,563 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-12-02 14:19:40,759 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:40,759 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:40,760 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:40,760 INFO L85 PathProgramCache]: Analyzing trace with hash -1750564749, now seen corresponding path program 1 times [2023-12-02 14:19:40,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:40,760 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [37656801] [2023-12-02 14:19:40,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:40,760 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:40,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:40,831 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:19:40,831 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:40,831 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [37656801] [2023-12-02 14:19:40,832 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [37656801] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:19:40,832 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096271945] [2023-12-02 14:19:40,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:40,832 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:40,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:19:40,833 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:19:40,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 14:19:40,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:40,880 INFO L262 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 14:19:40,881 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:19:40,923 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:19:40,923 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:19:40,923 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2096271945] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:19:40,923 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:19:40,924 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 9 [2023-12-02 14:19:40,924 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774507924] [2023-12-02 14:19:40,924 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:19:40,924 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:19:40,924 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:40,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:19:40,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2023-12-02 14:19:40,925 INFO L87 Difference]: Start difference. First operand 235 states and 298 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:41,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:41,044 INFO L93 Difference]: Finished difference Result 327 states and 436 transitions. [2023-12-02 14:19:41,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 14:19:41,046 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-12-02 14:19:41,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:41,049 INFO L225 Difference]: With dead ends: 327 [2023-12-02 14:19:41,049 INFO L226 Difference]: Without dead ends: 326 [2023-12-02 14:19:41,050 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2023-12-02 14:19:41,051 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 51 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:41,052 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 79 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:19:41,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2023-12-02 14:19:41,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 292. [2023-12-02 14:19:41,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 226 states have (on average 1.261061946902655) internal successors, (285), 233 states have internal predecessors, (285), 45 states have call successors, (45), 16 states have call predecessors, (45), 15 states have return successors, (42), 42 states have call predecessors, (42), 42 states have call successors, (42) [2023-12-02 14:19:41,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 372 transitions. [2023-12-02 14:19:41,094 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 372 transitions. Word has length 15 [2023-12-02 14:19:41,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:41,094 INFO L495 AbstractCegarLoop]: Abstraction has 292 states and 372 transitions. [2023-12-02 14:19:41,094 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:41,095 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 372 transitions. [2023-12-02 14:19:41,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-12-02 14:19:41,095 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:41,095 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:41,101 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 14:19:41,296 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-12-02 14:19:41,296 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:41,297 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:41,297 INFO L85 PathProgramCache]: Analyzing trace with hash -1576448012, now seen corresponding path program 1 times [2023-12-02 14:19:41,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:41,297 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [850480440] [2023-12-02 14:19:41,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:41,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:41,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:41,362 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:19:41,363 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:41,363 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [850480440] [2023-12-02 14:19:41,363 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [850480440] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:19:41,363 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1084632483] [2023-12-02 14:19:41,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:41,364 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:41,364 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:19:41,365 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:19:41,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 14:19:41,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:41,402 INFO L262 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 14:19:41,403 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:19:41,433 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:19:41,433 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:19:41,497 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:19:41,498 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1084632483] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:19:41,498 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [458589594] [2023-12-02 14:19:41,501 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 14:19:41,501 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:19:41,501 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:19:41,501 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:19:41,502 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2023-12-02 14:19:41,502 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085246151] [2023-12-02 14:19:41,502 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:19:41,502 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-12-02 14:19:41,503 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:41,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-12-02 14:19:41,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2023-12-02 14:19:41,503 INFO L87 Difference]: Start difference. First operand 292 states and 372 transitions. Second operand has 12 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:41,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:41,770 INFO L93 Difference]: Finished difference Result 590 states and 791 transitions. [2023-12-02 14:19:41,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 14:19:41,775 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2023-12-02 14:19:41,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:41,781 INFO L225 Difference]: With dead ends: 590 [2023-12-02 14:19:41,781 INFO L226 Difference]: Without dead ends: 589 [2023-12-02 14:19:41,782 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=238, Unknown=0, NotChecked=0, Total=342 [2023-12-02 14:19:41,783 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 156 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:41,783 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 166 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:19:41,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2023-12-02 14:19:41,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 520. [2023-12-02 14:19:41,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 520 states, 406 states have (on average 1.2044334975369457) internal successors, (489), 413 states have internal predecessors, (489), 81 states have call successors, (81), 28 states have call predecessors, (81), 27 states have return successors, (78), 78 states have call predecessors, (78), 78 states have call successors, (78) [2023-12-02 14:19:41,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 648 transitions. [2023-12-02 14:19:41,889 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 648 transitions. Word has length 18 [2023-12-02 14:19:41,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:41,889 INFO L495 AbstractCegarLoop]: Abstraction has 520 states and 648 transitions. [2023-12-02 14:19:41,890 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:41,890 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 648 transitions. [2023-12-02 14:19:41,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-12-02 14:19:41,891 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:41,891 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:41,897 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 14:19:42,092 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:42,093 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:42,093 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:42,094 INFO L85 PathProgramCache]: Analyzing trace with hash 244799614, now seen corresponding path program 1 times [2023-12-02 14:19:42,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:42,094 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735904040] [2023-12-02 14:19:42,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:42,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:42,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:42,207 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:19:42,207 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:42,207 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735904040] [2023-12-02 14:19:42,207 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1735904040] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:19:42,207 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2034280403] [2023-12-02 14:19:42,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:42,208 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:42,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:19:42,209 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:19:42,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 14:19:42,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:42,267 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 14:19:42,269 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:19:42,310 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:19:42,310 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:19:42,311 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2034280403] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:19:42,311 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:19:42,311 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7] total 10 [2023-12-02 14:19:42,311 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730502221] [2023-12-02 14:19:42,311 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:19:42,312 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:19:42,312 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:42,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:19:42,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2023-12-02 14:19:42,313 INFO L87 Difference]: Start difference. First operand 520 states and 648 transitions. Second operand has 5 states, 3 states have (on average 6.0) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-12-02 14:19:42,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:42,457 INFO L93 Difference]: Finished difference Result 561 states and 695 transitions. [2023-12-02 14:19:42,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 14:19:42,459 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 6.0) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2023-12-02 14:19:42,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:42,463 INFO L225 Difference]: With dead ends: 561 [2023-12-02 14:19:42,464 INFO L226 Difference]: Without dead ends: 560 [2023-12-02 14:19:42,464 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2023-12-02 14:19:42,465 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 43 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:42,465 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 97 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:19:42,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 560 states. [2023-12-02 14:19:42,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 560 to 519. [2023-12-02 14:19:42,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 519 states, 406 states have (on average 1.1945812807881773) internal successors, (485), 412 states have internal predecessors, (485), 81 states have call successors, (81), 28 states have call predecessors, (81), 27 states have return successors, (78), 78 states have call predecessors, (78), 78 states have call successors, (78) [2023-12-02 14:19:42,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 519 states to 519 states and 644 transitions. [2023-12-02 14:19:42,530 INFO L78 Accepts]: Start accepts. Automaton has 519 states and 644 transitions. Word has length 23 [2023-12-02 14:19:42,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:42,530 INFO L495 AbstractCegarLoop]: Abstraction has 519 states and 644 transitions. [2023-12-02 14:19:42,531 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 6.0) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-12-02 14:19:42,531 INFO L276 IsEmpty]: Start isEmpty. Operand 519 states and 644 transitions. [2023-12-02 14:19:42,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-12-02 14:19:42,532 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:42,532 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:42,538 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 14:19:42,734 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:42,734 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:42,735 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:42,735 INFO L85 PathProgramCache]: Analyzing trace with hash -1001146494, now seen corresponding path program 1 times [2023-12-02 14:19:42,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:42,735 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1722474830] [2023-12-02 14:19:42,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:42,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:42,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:42,831 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:19:42,831 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:42,832 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1722474830] [2023-12-02 14:19:42,832 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1722474830] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:19:42,832 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [506397644] [2023-12-02 14:19:42,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:42,832 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:42,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:19:42,834 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:19:42,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 14:19:42,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:42,880 INFO L262 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 10 conjunts are in the unsatisfiable core [2023-12-02 14:19:42,882 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:19:42,921 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:19:42,921 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:19:43,088 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:19:43,088 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [506397644] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:19:43,088 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1103053066] [2023-12-02 14:19:43,091 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-12-02 14:19:43,091 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:19:43,092 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:19:43,092 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:19:43,092 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-12-02 14:19:43,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449007569] [2023-12-02 14:19:43,093 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:19:43,093 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 14:19:43,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:43,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 14:19:43,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2023-12-02 14:19:43,094 INFO L87 Difference]: Start difference. First operand 519 states and 644 transitions. Second operand has 14 states, 11 states have (on average 3.272727272727273) internal successors, (36), 12 states have internal predecessors, (36), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 14:19:43,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:43,387 INFO L93 Difference]: Finished difference Result 822 states and 1146 transitions. [2023-12-02 14:19:43,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 14:19:43,391 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 3.272727272727273) internal successors, (36), 12 states have internal predecessors, (36), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2023-12-02 14:19:43,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:43,397 INFO L225 Difference]: With dead ends: 822 [2023-12-02 14:19:43,397 INFO L226 Difference]: Without dead ends: 820 [2023-12-02 14:19:43,398 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2023-12-02 14:19:43,398 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 140 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:43,399 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 101 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:19:43,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 820 states. [2023-12-02 14:19:43,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 820 to 746. [2023-12-02 14:19:43,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 746 states, 558 states have (on average 1.1827956989247312) internal successors, (660), 583 states have internal predecessors, (660), 130 states have call successors, (130), 35 states have call predecessors, (130), 53 states have return successors, (154), 127 states have call predecessors, (154), 126 states have call successors, (154) [2023-12-02 14:19:43,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 746 states to 746 states and 944 transitions. [2023-12-02 14:19:43,462 INFO L78 Accepts]: Start accepts. Automaton has 746 states and 944 transitions. Word has length 24 [2023-12-02 14:19:43,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:43,462 INFO L495 AbstractCegarLoop]: Abstraction has 746 states and 944 transitions. [2023-12-02 14:19:43,462 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 3.272727272727273) internal successors, (36), 12 states have internal predecessors, (36), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 14:19:43,462 INFO L276 IsEmpty]: Start isEmpty. Operand 746 states and 944 transitions. [2023-12-02 14:19:43,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-12-02 14:19:43,464 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:43,464 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:43,469 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-12-02 14:19:43,666 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:43,667 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:43,667 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:43,667 INFO L85 PathProgramCache]: Analyzing trace with hash -24086519, now seen corresponding path program 1 times [2023-12-02 14:19:43,667 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:43,667 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575111869] [2023-12-02 14:19:43,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:43,668 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:43,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:43,758 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 14:19:43,759 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:43,759 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575111869] [2023-12-02 14:19:43,759 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1575111869] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:19:43,759 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075174468] [2023-12-02 14:19:43,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:43,759 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:43,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:19:43,760 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:19:43,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 14:19:43,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:43,816 INFO L262 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 14:19:43,818 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:19:43,879 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 14:19:43,879 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:19:44,006 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 14:19:44,007 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075174468] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 14:19:44,007 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:19:44,007 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7, 6] total 12 [2023-12-02 14:19:44,007 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915824184] [2023-12-02 14:19:44,007 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:19:44,008 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 14:19:44,008 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:44,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 14:19:44,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2023-12-02 14:19:44,009 INFO L87 Difference]: Start difference. First operand 746 states and 944 transitions. Second operand has 7 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-12-02 14:19:44,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:44,253 INFO L93 Difference]: Finished difference Result 901 states and 1226 transitions. [2023-12-02 14:19:44,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 14:19:44,254 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2023-12-02 14:19:44,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:44,261 INFO L225 Difference]: With dead ends: 901 [2023-12-02 14:19:44,261 INFO L226 Difference]: Without dead ends: 900 [2023-12-02 14:19:44,262 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2023-12-02 14:19:44,262 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 51 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:44,263 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 99 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:19:44,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2023-12-02 14:19:44,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 829. [2023-12-02 14:19:44,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 829 states, 616 states have (on average 1.1818181818181819) internal successors, (728), 644 states have internal predecessors, (728), 149 states have call successors, (149), 38 states have call predecessors, (149), 59 states have return successors, (183), 146 states have call predecessors, (183), 145 states have call successors, (183) [2023-12-02 14:19:44,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 829 states to 829 states and 1060 transitions. [2023-12-02 14:19:44,323 INFO L78 Accepts]: Start accepts. Automaton has 829 states and 1060 transitions. Word has length 26 [2023-12-02 14:19:44,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:44,323 INFO L495 AbstractCegarLoop]: Abstraction has 829 states and 1060 transitions. [2023-12-02 14:19:44,323 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-12-02 14:19:44,324 INFO L276 IsEmpty]: Start isEmpty. Operand 829 states and 1060 transitions. [2023-12-02 14:19:44,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-12-02 14:19:44,325 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:44,325 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:44,330 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 14:19:44,526 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:44,526 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:44,526 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:44,527 INFO L85 PathProgramCache]: Analyzing trace with hash -1210732047, now seen corresponding path program 1 times [2023-12-02 14:19:44,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:44,527 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285461880] [2023-12-02 14:19:44,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:44,527 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:44,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:44,651 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:19:44,652 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:44,652 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285461880] [2023-12-02 14:19:44,652 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [285461880] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:19:44,652 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [924374009] [2023-12-02 14:19:44,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:44,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:44,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:19:44,654 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:19:44,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 14:19:44,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:44,707 INFO L262 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 14:19:44,709 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:19:44,757 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:19:44,758 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:19:44,983 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:19:44,983 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [924374009] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:19:44,983 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [882715480] [2023-12-02 14:19:44,986 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-12-02 14:19:44,987 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:19:44,987 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:19:44,987 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:19:44,988 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2023-12-02 14:19:44,988 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991591017] [2023-12-02 14:19:44,988 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:19:44,988 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 14:19:44,989 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:44,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 14:19:44,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2023-12-02 14:19:44,990 INFO L87 Difference]: Start difference. First operand 829 states and 1060 transitions. Second operand has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 14 states have internal predecessors, (42), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 1 states have call successors, (5) [2023-12-02 14:19:45,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:45,597 INFO L93 Difference]: Finished difference Result 1544 states and 2534 transitions. [2023-12-02 14:19:45,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-12-02 14:19:45,598 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 14 states have internal predecessors, (42), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 1 states have call successors, (5) Word has length 33 [2023-12-02 14:19:45,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:45,614 INFO L225 Difference]: With dead ends: 1544 [2023-12-02 14:19:45,614 INFO L226 Difference]: Without dead ends: 1542 [2023-12-02 14:19:45,616 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=190, Invalid=680, Unknown=0, NotChecked=0, Total=870 [2023-12-02 14:19:45,617 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 129 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:45,617 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [129 Valid, 162 Invalid, 372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:19:45,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1542 states. [2023-12-02 14:19:45,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1542 to 1294. [2023-12-02 14:19:45,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1294 states, 927 states have (on average 1.1661272923408845) internal successors, (1081), 974 states have internal predecessors, (1081), 247 states have call successors, (247), 53 states have call predecessors, (247), 115 states have return successors, (548), 266 states have call predecessors, (548), 242 states have call successors, (548) [2023-12-02 14:19:45,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1294 states to 1294 states and 1876 transitions. [2023-12-02 14:19:45,863 INFO L78 Accepts]: Start accepts. Automaton has 1294 states and 1876 transitions. Word has length 33 [2023-12-02 14:19:45,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:45,863 INFO L495 AbstractCegarLoop]: Abstraction has 1294 states and 1876 transitions. [2023-12-02 14:19:45,863 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 14 states have internal predecessors, (42), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 1 states have call successors, (5) [2023-12-02 14:19:45,864 INFO L276 IsEmpty]: Start isEmpty. Operand 1294 states and 1876 transitions. [2023-12-02 14:19:45,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-12-02 14:19:45,865 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:45,866 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:45,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-12-02 14:19:46,071 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:46,071 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:46,072 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:46,072 INFO L85 PathProgramCache]: Analyzing trace with hash 60876767, now seen corresponding path program 2 times [2023-12-02 14:19:46,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:46,072 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1313588262] [2023-12-02 14:19:46,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:46,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:46,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:46,196 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:19:46,197 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:46,197 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1313588262] [2023-12-02 14:19:46,197 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1313588262] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:19:46,197 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1232249404] [2023-12-02 14:19:46,197 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:19:46,197 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:46,197 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:19:46,198 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:19:46,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 14:19:46,254 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 14:19:46,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:19:46,255 INFO L262 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 14:19:46,257 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:19:46,309 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:19:46,309 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:19:46,491 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:19:46,491 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1232249404] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:19:46,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [883902990] [2023-12-02 14:19:46,493 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-12-02 14:19:46,493 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:19:46,494 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:19:46,494 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:19:46,494 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2023-12-02 14:19:46,494 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299506919] [2023-12-02 14:19:46,495 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:19:46,495 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 14:19:46,495 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:46,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 14:19:46,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2023-12-02 14:19:46,496 INFO L87 Difference]: Start difference. First operand 1294 states and 1876 transitions. Second operand has 18 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 6 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 14:19:47,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:47,229 INFO L93 Difference]: Finished difference Result 2153 states and 3287 transitions. [2023-12-02 14:19:47,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-12-02 14:19:47,230 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 6 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2023-12-02 14:19:47,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:47,250 INFO L225 Difference]: With dead ends: 2153 [2023-12-02 14:19:47,250 INFO L226 Difference]: Without dead ends: 2119 [2023-12-02 14:19:47,252 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=303, Invalid=957, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 14:19:47,253 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 432 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 210 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 432 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 210 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:47,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [432 Valid, 148 Invalid, 435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [210 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:19:47,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2119 states. [2023-12-02 14:19:47,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2119 to 1967. [2023-12-02 14:19:47,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1967 states, 1408 states have (on average 1.1519886363636365) internal successors, (1622), 1484 states have internal predecessors, (1622), 376 states have call successors, (376), 82 states have call predecessors, (376), 178 states have return successors, (845), 400 states have call predecessors, (845), 361 states have call successors, (845) [2023-12-02 14:19:47,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1967 states to 1967 states and 2843 transitions. [2023-12-02 14:19:47,533 INFO L78 Accepts]: Start accepts. Automaton has 1967 states and 2843 transitions. Word has length 34 [2023-12-02 14:19:47,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:47,534 INFO L495 AbstractCegarLoop]: Abstraction has 1967 states and 2843 transitions. [2023-12-02 14:19:47,534 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 2.8) internal successors, (42), 14 states have internal predecessors, (42), 6 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 14:19:47,534 INFO L276 IsEmpty]: Start isEmpty. Operand 1967 states and 2843 transitions. [2023-12-02 14:19:47,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-12-02 14:19:47,535 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:47,536 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:47,541 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 14:19:47,736 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:47,736 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:47,737 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:47,737 INFO L85 PathProgramCache]: Analyzing trace with hash 427659960, now seen corresponding path program 1 times [2023-12-02 14:19:47,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:47,737 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897630991] [2023-12-02 14:19:47,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:47,737 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:47,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:47,824 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 14 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:19:47,824 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:47,824 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897630991] [2023-12-02 14:19:47,824 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1897630991] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:19:47,824 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [482479184] [2023-12-02 14:19:47,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:47,825 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:47,825 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:19:47,826 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:19:47,828 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 14:19:47,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:47,871 INFO L262 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 14:19:47,873 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:19:47,919 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:19:47,919 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:19:48,113 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:19:48,114 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [482479184] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 14:19:48,114 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:19:48,114 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8, 8] total 17 [2023-12-02 14:19:48,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21496285] [2023-12-02 14:19:48,114 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:19:48,115 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 14:19:48,115 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:48,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 14:19:48,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2023-12-02 14:19:48,116 INFO L87 Difference]: Start difference. First operand 1967 states and 2843 transitions. Second operand has 9 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:19:48,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:48,533 INFO L93 Difference]: Finished difference Result 2199 states and 3486 transitions. [2023-12-02 14:19:48,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 14:19:48,534 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 35 [2023-12-02 14:19:48,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:48,555 INFO L225 Difference]: With dead ends: 2199 [2023-12-02 14:19:48,555 INFO L226 Difference]: Without dead ends: 2198 [2023-12-02 14:19:48,557 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=100, Invalid=550, Unknown=0, NotChecked=0, Total=650 [2023-12-02 14:19:48,558 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 65 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:48,558 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [71 Valid, 154 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 183 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:19:48,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2198 states. [2023-12-02 14:19:48,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2198 to 1975. [2023-12-02 14:19:48,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1975 states, 1416 states have (on average 1.1490112994350283) internal successors, (1627), 1488 states have internal predecessors, (1627), 380 states have call successors, (380), 82 states have call predecessors, (380), 174 states have return successors, (699), 404 states have call predecessors, (699), 365 states have call successors, (699) [2023-12-02 14:19:48,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1975 states to 1975 states and 2706 transitions. [2023-12-02 14:19:48,876 INFO L78 Accepts]: Start accepts. Automaton has 1975 states and 2706 transitions. Word has length 35 [2023-12-02 14:19:48,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:48,877 INFO L495 AbstractCegarLoop]: Abstraction has 1975 states and 2706 transitions. [2023-12-02 14:19:48,877 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:19:48,877 INFO L276 IsEmpty]: Start isEmpty. Operand 1975 states and 2706 transitions. [2023-12-02 14:19:48,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-12-02 14:19:48,879 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:48,879 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1] [2023-12-02 14:19:48,885 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-12-02 14:19:49,080 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 14:19:49,080 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:49,081 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:49,081 INFO L85 PathProgramCache]: Analyzing trace with hash 886287478, now seen corresponding path program 2 times [2023-12-02 14:19:49,081 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:49,081 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1245019410] [2023-12-02 14:19:49,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:49,081 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:49,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:49,232 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:19:49,233 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:49,233 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1245019410] [2023-12-02 14:19:49,233 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1245019410] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:19:49,233 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1086166077] [2023-12-02 14:19:49,233 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:19:49,234 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:49,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:19:49,235 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:19:49,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 14:19:49,288 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 14:19:49,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:19:49,289 INFO L262 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 14:19:49,291 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:19:49,347 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:19:49,347 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:19:49,493 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:19:49,493 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1086166077] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:19:49,493 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1337215829] [2023-12-02 14:19:49,495 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 14:19:49,495 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:19:49,495 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:19:49,495 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:19:49,495 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2023-12-02 14:19:49,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270002859] [2023-12-02 14:19:49,495 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:19:49,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-12-02 14:19:49,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:49,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-12-02 14:19:49,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=416, Unknown=0, NotChecked=0, Total=552 [2023-12-02 14:19:49,497 INFO L87 Difference]: Start difference. First operand 1975 states and 2706 transitions. Second operand has 24 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 14 states have internal predecessors, (72), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:50,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:50,340 INFO L93 Difference]: Finished difference Result 2825 states and 4250 transitions. [2023-12-02 14:19:50,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-12-02 14:19:50,341 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 14 states have internal predecessors, (72), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2023-12-02 14:19:50,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:50,365 INFO L225 Difference]: With dead ends: 2825 [2023-12-02 14:19:50,365 INFO L226 Difference]: Without dead ends: 2824 [2023-12-02 14:19:50,368 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=554, Invalid=1252, Unknown=0, NotChecked=0, Total=1806 [2023-12-02 14:19:50,369 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 481 mSDsluCounter, 348 mSDsCounter, 0 mSdLazyCounter, 401 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 484 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 401 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:50,369 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [484 Valid, 370 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 401 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:19:50,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2824 states. [2023-12-02 14:19:50,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2824 to 2647. [2023-12-02 14:19:50,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2647 states, 1896 states have (on average 1.136603375527426) internal successors, (2155), 1992 states have internal predecessors, (2155), 500 states have call successors, (500), 106 states have call predecessors, (500), 246 states have return successors, (909), 548 states have call predecessors, (909), 485 states have call successors, (909) [2023-12-02 14:19:50,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2647 states to 2647 states and 3564 transitions. [2023-12-02 14:19:50,688 INFO L78 Accepts]: Start accepts. Automaton has 2647 states and 3564 transitions. Word has length 42 [2023-12-02 14:19:50,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:50,688 INFO L495 AbstractCegarLoop]: Abstraction has 2647 states and 3564 transitions. [2023-12-02 14:19:50,688 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 14 states have internal predecessors, (72), 10 states have call successors, (10), 10 states have call predecessors, (10), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:19:50,688 INFO L276 IsEmpty]: Start isEmpty. Operand 2647 states and 3564 transitions. [2023-12-02 14:19:50,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-12-02 14:19:50,691 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:50,691 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:50,697 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 14:19:50,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 14:19:50,892 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:50,892 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:50,892 INFO L85 PathProgramCache]: Analyzing trace with hash 798745486, now seen corresponding path program 2 times [2023-12-02 14:19:50,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:50,892 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479470533] [2023-12-02 14:19:50,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:50,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:50,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:51,035 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 26 proven. 8 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:19:51,035 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:51,035 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479470533] [2023-12-02 14:19:51,035 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479470533] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:19:51,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [978913083] [2023-12-02 14:19:51,036 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:19:51,036 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:51,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:19:51,037 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:19:51,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 14:19:51,098 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 14:19:51,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:19:51,100 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 19 conjunts are in the unsatisfiable core [2023-12-02 14:19:51,102 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:19:51,195 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 14:19:51,195 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:19:51,325 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 29 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:19:51,325 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [978913083] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:19:51,326 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1109546447] [2023-12-02 14:19:51,328 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-12-02 14:19:51,328 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:19:51,328 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:19:51,329 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:19:51,329 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 8] total 18 [2023-12-02 14:19:51,329 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4459055] [2023-12-02 14:19:51,329 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:19:51,330 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 14:19:51,330 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:51,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 14:19:51,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2023-12-02 14:19:51,331 INFO L87 Difference]: Start difference. First operand 2647 states and 3564 transitions. Second operand has 18 states, 18 states have (on average 3.611111111111111) internal successors, (65), 15 states have internal predecessors, (65), 7 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-12-02 14:19:52,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:52,270 INFO L93 Difference]: Finished difference Result 5352 states and 8889 transitions. [2023-12-02 14:19:52,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-12-02 14:19:52,271 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.611111111111111) internal successors, (65), 15 states have internal predecessors, (65), 7 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 43 [2023-12-02 14:19:52,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:52,297 INFO L225 Difference]: With dead ends: 5352 [2023-12-02 14:19:52,297 INFO L226 Difference]: Without dead ends: 3352 [2023-12-02 14:19:52,323 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=273, Invalid=987, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 14:19:52,324 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 201 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:52,324 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [201 Valid, 104 Invalid, 625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 480 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:19:52,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3352 states. [2023-12-02 14:19:52,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3352 to 3122. [2023-12-02 14:19:52,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3122 states, 2172 states have (on average 1.0980662983425415) internal successors, (2385), 2208 states have internal predecessors, (2385), 572 states have call successors, (572), 104 states have call predecessors, (572), 373 states have return successors, (1358), 809 states have call predecessors, (1358), 543 states have call successors, (1358) [2023-12-02 14:19:52,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3122 states to 3122 states and 4315 transitions. [2023-12-02 14:19:52,646 INFO L78 Accepts]: Start accepts. Automaton has 3122 states and 4315 transitions. Word has length 43 [2023-12-02 14:19:52,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:52,646 INFO L495 AbstractCegarLoop]: Abstraction has 3122 states and 4315 transitions. [2023-12-02 14:19:52,647 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.611111111111111) internal successors, (65), 15 states have internal predecessors, (65), 7 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-12-02 14:19:52,647 INFO L276 IsEmpty]: Start isEmpty. Operand 3122 states and 4315 transitions. [2023-12-02 14:19:52,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-12-02 14:19:52,650 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:52,650 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-12-02 14:19:52,656 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 14:19:52,850 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 14:19:52,850 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ackermannErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:52,851 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:52,851 INFO L85 PathProgramCache]: Analyzing trace with hash 1124411276, now seen corresponding path program 1 times [2023-12-02 14:19:52,851 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:52,851 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587975654] [2023-12-02 14:19:52,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:52,851 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:52,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:52,967 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 52 proven. 6 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 14:19:52,967 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:52,967 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587975654] [2023-12-02 14:19:52,967 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1587975654] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:19:52,967 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510781039] [2023-12-02 14:19:52,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:52,968 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:52,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:19:52,969 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:19:52,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 14:19:53,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:53,033 INFO L262 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2023-12-02 14:19:53,035 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:19:53,170 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 51 proven. 11 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 14:19:53,171 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:19:53,362 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 51 proven. 11 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 14:19:53,362 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510781039] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:19:53,362 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1714389938] [2023-12-02 14:19:53,364 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-12-02 14:19:53,364 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:19:53,365 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:19:53,366 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:19:53,366 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11] total 22 [2023-12-02 14:19:53,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757819790] [2023-12-02 14:19:53,366 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:19:53,367 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-12-02 14:19:53,367 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:53,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-12-02 14:19:53,368 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=398, Unknown=0, NotChecked=0, Total=462 [2023-12-02 14:19:53,368 INFO L87 Difference]: Start difference. First operand 3122 states and 4315 transitions. Second operand has 22 states, 22 states have (on average 3.772727272727273) internal successors, (83), 18 states have internal predecessors, (83), 8 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2023-12-02 14:19:54,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:54,256 INFO L93 Difference]: Finished difference Result 4774 states and 7131 transitions. [2023-12-02 14:19:54,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-12-02 14:19:54,257 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.772727272727273) internal successors, (83), 18 states have internal predecessors, (83), 8 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 52 [2023-12-02 14:19:54,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:54,275 INFO L225 Difference]: With dead ends: 4774 [2023-12-02 14:19:54,275 INFO L226 Difference]: Without dead ends: 2261 [2023-12-02 14:19:54,304 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 94 SyntacticMatches, 5 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=442, Invalid=1450, Unknown=0, NotChecked=0, Total=1892 [2023-12-02 14:19:54,305 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 286 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 659 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 286 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 795 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 659 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:54,305 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [286 Valid, 93 Invalid, 795 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 659 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:19:54,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2261 states. [2023-12-02 14:19:54,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2261 to 1874. [2023-12-02 14:19:54,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1874 states, 1378 states have (on average 1.1248185776487662) internal successors, (1550), 1422 states have internal predecessors, (1550), 300 states have call successors, (300), 98 states have call predecessors, (300), 191 states have return successors, (504), 353 states have call predecessors, (504), 252 states have call successors, (504) [2023-12-02 14:19:54,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1874 states to 1874 states and 2354 transitions. [2023-12-02 14:19:54,539 INFO L78 Accepts]: Start accepts. Automaton has 1874 states and 2354 transitions. Word has length 52 [2023-12-02 14:19:54,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:54,539 INFO L495 AbstractCegarLoop]: Abstraction has 1874 states and 2354 transitions. [2023-12-02 14:19:54,539 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.772727272727273) internal successors, (83), 18 states have internal predecessors, (83), 8 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2023-12-02 14:19:54,539 INFO L276 IsEmpty]: Start isEmpty. Operand 1874 states and 2354 transitions. [2023-12-02 14:19:54,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-12-02 14:19:54,541 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:54,541 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:54,547 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 14:19:54,742 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 14:19:54,742 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:54,742 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:54,742 INFO L85 PathProgramCache]: Analyzing trace with hash -1345923957, now seen corresponding path program 3 times [2023-12-02 14:19:54,743 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:54,743 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444969760] [2023-12-02 14:19:54,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:54,743 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:54,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:54,908 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 3 proven. 71 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:19:54,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:54,909 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444969760] [2023-12-02 14:19:54,909 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444969760] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:19:54,909 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471439509] [2023-12-02 14:19:54,909 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:19:54,909 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:54,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:19:54,911 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:19:54,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 14:19:54,951 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:19:54,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:19:54,952 INFO L262 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 15 conjunts are in the unsatisfiable core [2023-12-02 14:19:54,953 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:19:55,015 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 53 proven. 2 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 14:19:55,015 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:19:55,067 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 53 proven. 2 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 14:19:55,067 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471439509] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:19:55,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1301220002] [2023-12-02 14:19:55,069 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-12-02 14:19:55,069 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:19:55,070 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:19:55,071 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:19:55,071 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 6, 6] total 19 [2023-12-02 14:19:55,071 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132834525] [2023-12-02 14:19:55,071 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:19:55,072 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-12-02 14:19:55,072 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:55,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-12-02 14:19:55,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2023-12-02 14:19:55,073 INFO L87 Difference]: Start difference. First operand 1874 states and 2354 transitions. Second operand has 19 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 14 states have internal predecessors, (62), 8 states have call successors, (11), 7 states have call predecessors, (11), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 14:19:55,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:55,663 INFO L93 Difference]: Finished difference Result 1974 states and 2504 transitions. [2023-12-02 14:19:55,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-12-02 14:19:55,664 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 14 states have internal predecessors, (62), 8 states have call successors, (11), 7 states have call predecessors, (11), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 50 [2023-12-02 14:19:55,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:55,674 INFO L225 Difference]: With dead ends: 1974 [2023-12-02 14:19:55,674 INFO L226 Difference]: Without dead ends: 1493 [2023-12-02 14:19:55,677 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=314, Invalid=1092, Unknown=0, NotChecked=0, Total=1406 [2023-12-02 14:19:55,678 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 435 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 333 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 435 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 526 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:55,678 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [435 Valid, 104 Invalid, 526 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 333 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:19:55,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1493 states. [2023-12-02 14:19:55,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1493 to 1398. [2023-12-02 14:19:55,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1398 states, 989 states have (on average 1.0819009100101111) internal successors, (1070), 999 states have internal predecessors, (1070), 256 states have call successors, (256), 60 states have call predecessors, (256), 148 states have return successors, (452), 338 states have call predecessors, (452), 252 states have call successors, (452) [2023-12-02 14:19:55,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1398 states to 1398 states and 1778 transitions. [2023-12-02 14:19:55,927 INFO L78 Accepts]: Start accepts. Automaton has 1398 states and 1778 transitions. Word has length 50 [2023-12-02 14:19:55,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:55,927 INFO L495 AbstractCegarLoop]: Abstraction has 1398 states and 1778 transitions. [2023-12-02 14:19:55,928 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 14 states have internal predecessors, (62), 8 states have call successors, (11), 7 states have call predecessors, (11), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 14:19:55,928 INFO L276 IsEmpty]: Start isEmpty. Operand 1398 states and 1778 transitions. [2023-12-02 14:19:55,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-12-02 14:19:55,930 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:55,930 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:19:55,935 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 14:19:56,130 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 14:19:56,131 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:56,132 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:56,132 INFO L85 PathProgramCache]: Analyzing trace with hash 553185385, now seen corresponding path program 1 times [2023-12-02 14:19:56,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:56,132 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604266131] [2023-12-02 14:19:56,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:56,133 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:56,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:56,333 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 18 proven. 19 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 14:19:56,333 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:56,333 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604266131] [2023-12-02 14:19:56,333 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1604266131] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:19:56,333 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [422160535] [2023-12-02 14:19:56,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:56,334 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:56,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:19:56,335 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:19:56,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 14:19:56,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:56,393 INFO L262 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 15 conjunts are in the unsatisfiable core [2023-12-02 14:19:56,395 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:19:56,437 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 14 proven. 18 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 14:19:56,437 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:19:56,952 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 18 proven. 19 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 14:19:56,952 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [422160535] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:19:56,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [689394827] [2023-12-02 14:19:56,954 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 14:19:56,955 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:19:56,955 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:19:56,955 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:19:56,955 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 13] total 25 [2023-12-02 14:19:56,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611941451] [2023-12-02 14:19:56,956 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:19:56,956 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 14:19:56,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:19:56,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 14:19:56,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2023-12-02 14:19:56,958 INFO L87 Difference]: Start difference. First operand 1398 states and 1778 transitions. Second operand has 26 states, 25 states have (on average 2.12) internal successors, (53), 20 states have internal predecessors, (53), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (9), 8 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 14:19:58,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:19:58,854 INFO L93 Difference]: Finished difference Result 4227 states and 7026 transitions. [2023-12-02 14:19:58,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2023-12-02 14:19:58,855 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.12) internal successors, (53), 20 states have internal predecessors, (53), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (9), 8 states have call predecessors, (9), 3 states have call successors, (9) Word has length 52 [2023-12-02 14:19:58,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:19:58,893 INFO L225 Difference]: With dead ends: 4227 [2023-12-02 14:19:58,893 INFO L226 Difference]: Without dead ends: 4197 [2023-12-02 14:19:58,899 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2370 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1466, Invalid=6724, Unknown=0, NotChecked=0, Total=8190 [2023-12-02 14:19:58,900 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 302 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 447 mSolverCounterSat, 366 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 302 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 813 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 366 IncrementalHoareTripleChecker+Valid, 447 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:19:58,900 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [302 Valid, 234 Invalid, 813 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [366 Valid, 447 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:19:58,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4197 states. [2023-12-02 14:19:59,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4197 to 3144. [2023-12-02 14:19:59,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3144 states, 2065 states have (on average 1.0576271186440678) internal successors, (2184), 2071 states have internal predecessors, (2184), 632 states have call successors, (632), 82 states have call predecessors, (632), 442 states have return successors, (2651), 990 states have call predecessors, (2651), 626 states have call successors, (2651) [2023-12-02 14:19:59,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3144 states to 3144 states and 5467 transitions. [2023-12-02 14:19:59,377 INFO L78 Accepts]: Start accepts. Automaton has 3144 states and 5467 transitions. Word has length 52 [2023-12-02 14:19:59,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:19:59,377 INFO L495 AbstractCegarLoop]: Abstraction has 3144 states and 5467 transitions. [2023-12-02 14:19:59,377 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.12) internal successors, (53), 20 states have internal predecessors, (53), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (9), 8 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 14:19:59,377 INFO L276 IsEmpty]: Start isEmpty. Operand 3144 states and 5467 transitions. [2023-12-02 14:19:59,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-12-02 14:19:59,378 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:19:59,378 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2023-12-02 14:19:59,383 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 14:19:59,579 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:59,579 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ackermannErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:19:59,579 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:19:59,579 INFO L85 PathProgramCache]: Analyzing trace with hash -352778574, now seen corresponding path program 1 times [2023-12-02 14:19:59,579 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:19:59,580 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1083682612] [2023-12-02 14:19:59,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:59,580 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:59,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:59,723 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 14:19:59,723 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:19:59,724 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1083682612] [2023-12-02 14:19:59,724 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1083682612] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:19:59,724 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1628882997] [2023-12-02 14:19:59,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:19:59,724 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:19:59,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:19:59,725 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:19:59,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 14:19:59,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:19:59,780 INFO L262 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 18 conjunts are in the unsatisfiable core [2023-12-02 14:19:59,782 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:19:59,851 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 14:19:59,851 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:20:00,028 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 14:20:00,028 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1628882997] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:20:00,028 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [189263586] [2023-12-02 14:20:00,030 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 14:20:00,030 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:20:00,030 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:20:00,031 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:20:00,032 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2023-12-02 14:20:00,032 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578225918] [2023-12-02 14:20:00,032 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:20:00,032 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-12-02 14:20:00,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:20:00,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-12-02 14:20:00,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=416, Unknown=0, NotChecked=0, Total=552 [2023-12-02 14:20:00,034 INFO L87 Difference]: Start difference. First operand 3144 states and 5467 transitions. Second operand has 24 states, 23 states have (on average 3.608695652173913) internal successors, (83), 14 states have internal predecessors, (83), 10 states have call successors, (16), 10 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:20:01,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:20:01,154 INFO L93 Difference]: Finished difference Result 8088 states and 14059 transitions. [2023-12-02 14:20:01,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-12-02 14:20:01,156 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 3.608695652173913) internal successors, (83), 14 states have internal predecessors, (83), 10 states have call successors, (16), 10 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2023-12-02 14:20:01,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:20:01,208 INFO L225 Difference]: With dead ends: 8088 [2023-12-02 14:20:01,208 INFO L226 Difference]: Without dead ends: 8086 [2023-12-02 14:20:01,212 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=554, Invalid=1252, Unknown=0, NotChecked=0, Total=1806 [2023-12-02 14:20:01,213 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 668 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 239 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 673 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 239 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:20:01,213 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [673 Valid, 297 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [239 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:20:01,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8086 states. [2023-12-02 14:20:02,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8086 to 8058. [2023-12-02 14:20:02,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8058 states, 5293 states have (on average 1.056489703381825) internal successors, (5592), 5299 states have internal predecessors, (5592), 1616 states have call successors, (1616), 208 states have call predecessors, (1616), 1144 states have return successors, (6821), 2550 states have call predecessors, (6821), 1610 states have call successors, (6821) [2023-12-02 14:20:02,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8058 states to 8058 states and 14029 transitions. [2023-12-02 14:20:02,107 INFO L78 Accepts]: Start accepts. Automaton has 8058 states and 14029 transitions. Word has length 56 [2023-12-02 14:20:02,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:20:02,108 INFO L495 AbstractCegarLoop]: Abstraction has 8058 states and 14029 transitions. [2023-12-02 14:20:02,108 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 3.608695652173913) internal successors, (83), 14 states have internal predecessors, (83), 10 states have call successors, (16), 10 states have call predecessors, (16), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:20:02,108 INFO L276 IsEmpty]: Start isEmpty. Operand 8058 states and 14029 transitions. [2023-12-02 14:20:02,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-12-02 14:20:02,109 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:20:02,109 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 5, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:20:02,114 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 14:20:02,309 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:20:02,310 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:20:02,310 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:20:02,310 INFO L85 PathProgramCache]: Analyzing trace with hash 1430892465, now seen corresponding path program 1 times [2023-12-02 14:20:02,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:20:02,310 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146696313] [2023-12-02 14:20:02,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:20:02,310 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:20:02,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:20:02,477 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 43 proven. 11 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 14:20:02,478 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:20:02,478 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146696313] [2023-12-02 14:20:02,478 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [146696313] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:20:02,478 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1109948769] [2023-12-02 14:20:02,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:20:02,478 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:20:02,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:20:02,479 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:20:02,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 14:20:02,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:20:02,542 INFO L262 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 14:20:02,543 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:20:02,595 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 35 proven. 14 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 14:20:02,595 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:20:03,419 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 52 proven. 2 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 14:20:03,420 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1109948769] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:20:03,420 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [622872984] [2023-12-02 14:20:03,421 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 14:20:03,421 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:20:03,421 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:20:03,421 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:20:03,422 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 14] total 27 [2023-12-02 14:20:03,422 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306497822] [2023-12-02 14:20:03,422 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:20:03,422 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-12-02 14:20:03,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:20:03,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-12-02 14:20:03,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2023-12-02 14:20:03,423 INFO L87 Difference]: Start difference. First operand 8058 states and 14029 transitions. Second operand has 28 states, 27 states have (on average 2.185185185185185) internal successors, (59), 20 states have internal predecessors, (59), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:20:05,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:20:05,138 INFO L93 Difference]: Finished difference Result 16972 states and 33384 transitions. [2023-12-02 14:20:05,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-12-02 14:20:05,139 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.185185185185185) internal successors, (59), 20 states have internal predecessors, (59), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) Word has length 63 [2023-12-02 14:20:05,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:20:05,181 INFO L225 Difference]: With dead ends: 16972 [2023-12-02 14:20:05,182 INFO L226 Difference]: Without dead ends: 9352 [2023-12-02 14:20:05,256 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 646 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=714, Invalid=2826, Unknown=0, NotChecked=0, Total=3540 [2023-12-02 14:20:05,257 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 148 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 565 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 654 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 565 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:20:05,258 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 254 Invalid, 654 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 565 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:20:05,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9352 states. [2023-12-02 14:20:06,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9352 to 9091. [2023-12-02 14:20:06,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9091 states, 5952 states have (on average 1.0460349462365592) internal successors, (6226), 5957 states have internal predecessors, (6226), 1849 states have call successors, (1849), 235 states have call predecessors, (1849), 1286 states have return successors, (5776), 2898 states have call predecessors, (5776), 1843 states have call successors, (5776) [2023-12-02 14:20:06,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9091 states to 9091 states and 13851 transitions. [2023-12-02 14:20:06,242 INFO L78 Accepts]: Start accepts. Automaton has 9091 states and 13851 transitions. Word has length 63 [2023-12-02 14:20:06,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:20:06,242 INFO L495 AbstractCegarLoop]: Abstraction has 9091 states and 13851 transitions. [2023-12-02 14:20:06,242 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.185185185185185) internal successors, (59), 20 states have internal predecessors, (59), 5 states have call successors, (7), 3 states have call predecessors, (7), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:20:06,242 INFO L276 IsEmpty]: Start isEmpty. Operand 9091 states and 13851 transitions. [2023-12-02 14:20:06,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2023-12-02 14:20:06,245 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:20:06,245 INFO L195 NwaCegarLoop]: trace histogram [9, 7, 5, 5, 5, 5, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:20:06,251 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 14:20:06,446 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:20:06,446 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:20:06,446 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:20:06,446 INFO L85 PathProgramCache]: Analyzing trace with hash -924055203, now seen corresponding path program 2 times [2023-12-02 14:20:06,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:20:06,447 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155119294] [2023-12-02 14:20:06,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:20:06,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:20:06,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:20:06,737 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 91 proven. 35 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 14:20:06,737 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:20:06,737 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155119294] [2023-12-02 14:20:06,737 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [155119294] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:20:06,738 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1447843557] [2023-12-02 14:20:06,738 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:20:06,738 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:20:06,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:20:06,739 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:20:06,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 14:20:06,819 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-12-02 14:20:06,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:20:06,820 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 21 conjunts are in the unsatisfiable core [2023-12-02 14:20:06,823 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:20:06,874 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 83 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 14:20:06,875 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:20:07,721 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 103 proven. 23 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 14:20:07,721 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1447843557] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:20:07,721 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [485010504] [2023-12-02 14:20:07,723 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 14:20:07,723 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:20:07,723 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:20:07,724 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:20:07,724 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16, 18] total 35 [2023-12-02 14:20:07,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043963515] [2023-12-02 14:20:07,724 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:20:07,725 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-12-02 14:20:07,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:20:07,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-12-02 14:20:07,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1111, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 14:20:07,726 INFO L87 Difference]: Start difference. First operand 9091 states and 13851 transitions. Second operand has 36 states, 35 states have (on average 2.4857142857142858) internal successors, (87), 24 states have internal predecessors, (87), 9 states have call successors, (11), 7 states have call predecessors, (11), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:20:10,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:20:10,204 INFO L93 Difference]: Finished difference Result 18949 states and 30215 transitions. [2023-12-02 14:20:10,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2023-12-02 14:20:10,206 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 2.4857142857142858) internal successors, (87), 24 states have internal predecessors, (87), 9 states have call successors, (11), 7 states have call predecessors, (11), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) Word has length 79 [2023-12-02 14:20:10,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:20:10,240 INFO L225 Difference]: With dead ends: 18949 [2023-12-02 14:20:10,240 INFO L226 Difference]: Without dead ends: 10296 [2023-12-02 14:20:10,278 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1997 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1644, Invalid=6728, Unknown=0, NotChecked=0, Total=8372 [2023-12-02 14:20:10,278 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 277 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 713 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 277 SdHoareTripleChecker+Valid, 305 SdHoareTripleChecker+Invalid, 889 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 713 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:20:10,279 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [277 Valid, 305 Invalid, 889 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 713 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:20:10,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10296 states. [2023-12-02 14:20:11,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10296 to 8519. [2023-12-02 14:20:11,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8519 states, 5708 states have (on average 1.05395935529082) internal successors, (6016), 5732 states have internal predecessors, (6016), 1682 states have call successors, (1682), 279 states have call predecessors, (1682), 1125 states have return successors, (3512), 2507 states have call predecessors, (3512), 1677 states have call successors, (3512) [2023-12-02 14:20:11,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8519 states to 8519 states and 11210 transitions. [2023-12-02 14:20:11,217 INFO L78 Accepts]: Start accepts. Automaton has 8519 states and 11210 transitions. Word has length 79 [2023-12-02 14:20:11,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:20:11,218 INFO L495 AbstractCegarLoop]: Abstraction has 8519 states and 11210 transitions. [2023-12-02 14:20:11,218 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 2.4857142857142858) internal successors, (87), 24 states have internal predecessors, (87), 9 states have call successors, (11), 7 states have call predecessors, (11), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:20:11,218 INFO L276 IsEmpty]: Start isEmpty. Operand 8519 states and 11210 transitions. [2023-12-02 14:20:11,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2023-12-02 14:20:11,222 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:20:11,222 INFO L195 NwaCegarLoop]: trace histogram [12, 8, 7, 6, 6, 6, 6, 6, 6, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-12-02 14:20:11,228 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2023-12-02 14:20:11,423 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:20:11,423 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:20:11,423 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:20:11,423 INFO L85 PathProgramCache]: Analyzing trace with hash 2143415402, now seen corresponding path program 2 times [2023-12-02 14:20:11,424 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:20:11,424 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792765422] [2023-12-02 14:20:11,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:20:11,424 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:20:11,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:20:11,533 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 132 proven. 31 refuted. 0 times theorem prover too weak. 137 trivial. 0 not checked. [2023-12-02 14:20:11,533 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:20:11,533 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792765422] [2023-12-02 14:20:11,534 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [792765422] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:20:11,534 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2084316012] [2023-12-02 14:20:11,534 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:20:11,534 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:20:11,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:20:11,535 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:20:11,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 14:20:11,624 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-12-02 14:20:11,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:20:11,626 INFO L262 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 23 conjunts are in the unsatisfiable core [2023-12-02 14:20:11,628 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:20:11,791 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 43 proven. 51 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2023-12-02 14:20:11,791 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:20:13,282 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 51 proven. 58 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2023-12-02 14:20:13,282 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2084316012] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:20:13,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [226172601] [2023-12-02 14:20:13,284 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 14:20:13,284 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:20:13,284 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:20:13,284 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:20:13,284 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 15, 19] total 38 [2023-12-02 14:20:13,285 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557893044] [2023-12-02 14:20:13,285 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:20:13,285 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-12-02 14:20:13,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:20:13,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-12-02 14:20:13,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1261, Unknown=0, NotChecked=0, Total=1406 [2023-12-02 14:20:13,287 INFO L87 Difference]: Start difference. First operand 8519 states and 11210 transitions. Second operand has 38 states, 38 states have (on average 2.526315789473684) internal successors, (96), 28 states have internal predecessors, (96), 13 states have call successors, (15), 4 states have call predecessors, (15), 15 states have return successors, (21), 18 states have call predecessors, (21), 10 states have call successors, (21) [2023-12-02 14:20:18,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:20:18,675 INFO L93 Difference]: Finished difference Result 33531 states and 49208 transitions. [2023-12-02 14:20:18,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2023-12-02 14:20:18,676 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.526315789473684) internal successors, (96), 28 states have internal predecessors, (96), 13 states have call successors, (15), 4 states have call predecessors, (15), 15 states have return successors, (21), 18 states have call predecessors, (21), 10 states have call successors, (21) Word has length 104 [2023-12-02 14:20:18,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:20:18,781 INFO L225 Difference]: With dead ends: 33531 [2023-12-02 14:20:18,781 INFO L226 Difference]: Without dead ends: 24831 [2023-12-02 14:20:18,821 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 209 SyntacticMatches, 0 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6527 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=3275, Invalid=18187, Unknown=0, NotChecked=0, Total=21462 [2023-12-02 14:20:18,821 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 474 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 811 mSolverCounterSat, 415 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 474 SdHoareTripleChecker+Valid, 308 SdHoareTripleChecker+Invalid, 1226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 415 IncrementalHoareTripleChecker+Valid, 811 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 14:20:18,822 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [474 Valid, 308 Invalid, 1226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [415 Valid, 811 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 14:20:18,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24831 states. [2023-12-02 14:20:20,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24831 to 16863. [2023-12-02 14:20:20,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16863 states, 10869 states have (on average 1.0326616984083172) internal successors, (11224), 10811 states have internal predecessors, (11224), 3413 states have call successors, (3413), 363 states have call predecessors, (3413), 2577 states have return successors, (10028), 5688 states have call predecessors, (10028), 3380 states have call successors, (10028) [2023-12-02 14:20:20,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16863 states to 16863 states and 24665 transitions. [2023-12-02 14:20:20,779 INFO L78 Accepts]: Start accepts. Automaton has 16863 states and 24665 transitions. Word has length 104 [2023-12-02 14:20:20,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:20:20,780 INFO L495 AbstractCegarLoop]: Abstraction has 16863 states and 24665 transitions. [2023-12-02 14:20:20,780 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.526315789473684) internal successors, (96), 28 states have internal predecessors, (96), 13 states have call successors, (15), 4 states have call predecessors, (15), 15 states have return successors, (21), 18 states have call predecessors, (21), 10 states have call successors, (21) [2023-12-02 14:20:20,780 INFO L276 IsEmpty]: Start isEmpty. Operand 16863 states and 24665 transitions. [2023-12-02 14:20:20,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2023-12-02 14:20:20,784 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:20:20,785 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1] [2023-12-02 14:20:20,789 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 14:20:20,985 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:20:20,985 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:20:20,985 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:20:20,986 INFO L85 PathProgramCache]: Analyzing trace with hash 1406382970, now seen corresponding path program 3 times [2023-12-02 14:20:20,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:20:20,986 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1571155424] [2023-12-02 14:20:20,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:20:20,986 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:20:21,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:20:21,414 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:20:21,415 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:20:21,415 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1571155424] [2023-12-02 14:20:21,415 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1571155424] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:20:21,415 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1637248358] [2023-12-02 14:20:21,415 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:20:21,415 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:20:21,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:20:21,416 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:20:21,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 14:20:21,496 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:20:21,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:20:21,498 INFO L262 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 14:20:21,500 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:20:21,592 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:20:21,592 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:20:22,080 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:20:22,081 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1637248358] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:20:22,081 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [592999183] [2023-12-02 14:20:22,082 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 14:20:22,082 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:20:22,082 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:20:22,083 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:20:22,083 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2023-12-02 14:20:22,083 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349548064] [2023-12-02 14:20:22,083 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:20:22,084 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2023-12-02 14:20:22,084 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:20:22,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2023-12-02 14:20:22,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=556, Invalid=1700, Unknown=0, NotChecked=0, Total=2256 [2023-12-02 14:20:22,085 INFO L87 Difference]: Start difference. First operand 16863 states and 24665 transitions. Second operand has 48 states, 45 states have (on average 3.466666666666667) internal successors, (156), 26 states have internal predecessors, (156), 22 states have call successors, (22), 22 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:20:25,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:20:25,465 INFO L93 Difference]: Finished difference Result 25869 states and 37061 transitions. [2023-12-02 14:20:25,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2023-12-02 14:20:25,466 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 45 states have (on average 3.466666666666667) internal successors, (156), 26 states have internal predecessors, (156), 22 states have call successors, (22), 22 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 90 [2023-12-02 14:20:25,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:20:25,554 INFO L225 Difference]: With dead ends: 25869 [2023-12-02 14:20:25,554 INFO L226 Difference]: Without dead ends: 25868 [2023-12-02 14:20:25,564 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1830 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2534, Invalid=5656, Unknown=0, NotChecked=0, Total=8190 [2023-12-02 14:20:25,565 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 1022 mSDsluCounter, 541 mSDsCounter, 0 mSdLazyCounter, 559 mSolverCounterSat, 283 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1026 SdHoareTripleChecker+Valid, 562 SdHoareTripleChecker+Invalid, 842 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 283 IncrementalHoareTripleChecker+Valid, 559 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:20:25,565 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1026 Valid, 562 Invalid, 842 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [283 Valid, 559 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:20:25,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25868 states. [2023-12-02 14:20:28,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25868 to 25023. [2023-12-02 14:20:28,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25023 states, 16149 states have (on average 1.029413585980556) internal successors, (16624), 15971 states have internal predecessors, (16624), 4973 states have call successors, (4973), 483 states have call predecessors, (4973), 3897 states have return successors, (14588), 8568 states have call predecessors, (14588), 4940 states have call successors, (14588) [2023-12-02 14:20:28,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25023 states to 25023 states and 36185 transitions. [2023-12-02 14:20:28,291 INFO L78 Accepts]: Start accepts. Automaton has 25023 states and 36185 transitions. Word has length 90 [2023-12-02 14:20:28,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:20:28,291 INFO L495 AbstractCegarLoop]: Abstraction has 25023 states and 36185 transitions. [2023-12-02 14:20:28,291 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 45 states have (on average 3.466666666666667) internal successors, (156), 26 states have internal predecessors, (156), 22 states have call successors, (22), 22 states have call predecessors, (22), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:20:28,291 INFO L276 IsEmpty]: Start isEmpty. Operand 25023 states and 36185 transitions. [2023-12-02 14:20:28,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-12-02 14:20:28,297 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:20:28,297 INFO L195 NwaCegarLoop]: trace histogram [14, 10, 9, 6, 6, 6, 6, 6, 6, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2023-12-02 14:20:28,302 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 14:20:28,497 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-12-02 14:20:28,497 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:20:28,498 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:20:28,498 INFO L85 PathProgramCache]: Analyzing trace with hash 359589539, now seen corresponding path program 3 times [2023-12-02 14:20:28,498 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:20:28,498 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1289282921] [2023-12-02 14:20:28,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:20:28,499 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:20:28,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:20:28,666 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 202 proven. 52 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2023-12-02 14:20:28,666 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:20:28,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1289282921] [2023-12-02 14:20:28,666 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1289282921] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:20:28,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [897818865] [2023-12-02 14:20:28,666 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:20:28,667 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:20:28,667 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:20:28,668 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:20:28,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 14:20:28,770 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:20:28,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:20:28,771 INFO L262 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 14:20:28,773 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:20:28,829 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 219 proven. 26 refuted. 0 times theorem prover too weak. 185 trivial. 0 not checked. [2023-12-02 14:20:28,829 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:20:29,731 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 183 proven. 59 refuted. 0 times theorem prover too weak. 188 trivial. 0 not checked. [2023-12-02 14:20:29,731 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [897818865] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:20:29,732 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1991503057] [2023-12-02 14:20:29,733 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 14:20:29,733 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:20:29,733 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:20:29,734 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:20:29,734 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11] total 15 [2023-12-02 14:20:29,734 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047526907] [2023-12-02 14:20:29,734 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:20:29,735 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-12-02 14:20:29,735 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:20:29,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-12-02 14:20:29,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2023-12-02 14:20:29,736 INFO L87 Difference]: Start difference. First operand 25023 states and 36185 transitions. Second operand has 15 states, 15 states have (on average 5.066666666666666) internal successors, (76), 15 states have internal predecessors, (76), 9 states have call successors, (14), 2 states have call predecessors, (14), 7 states have return successors, (18), 6 states have call predecessors, (18), 9 states have call successors, (18) [2023-12-02 14:20:32,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:20:32,973 INFO L93 Difference]: Finished difference Result 56157 states and 115234 transitions. [2023-12-02 14:20:32,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 14:20:32,973 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 5.066666666666666) internal successors, (76), 15 states have internal predecessors, (76), 9 states have call successors, (14), 2 states have call predecessors, (14), 7 states have return successors, (18), 6 states have call predecessors, (18), 9 states have call successors, (18) Word has length 124 [2023-12-02 14:20:32,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:20:33,145 INFO L225 Difference]: With dead ends: 56157 [2023-12-02 14:20:33,145 INFO L226 Difference]: Without dead ends: 32814 [2023-12-02 14:20:33,289 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 249 SyntacticMatches, 6 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=326, Unknown=0, NotChecked=0, Total=462 [2023-12-02 14:20:33,290 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 115 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:20:33,290 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 151 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:20:33,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32814 states. [2023-12-02 14:20:36,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32814 to 28421. [2023-12-02 14:20:36,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28421 states, 18912 states have (on average 1.0412965313028766) internal successors, (19693), 18910 states have internal predecessors, (19693), 5531 states have call successors, (5531), 795 states have call predecessors, (5531), 3974 states have return successors, (17686), 8715 states have call predecessors, (17686), 5478 states have call successors, (17686) [2023-12-02 14:20:37,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28421 states to 28421 states and 42910 transitions. [2023-12-02 14:20:37,129 INFO L78 Accepts]: Start accepts. Automaton has 28421 states and 42910 transitions. Word has length 124 [2023-12-02 14:20:37,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:20:37,129 INFO L495 AbstractCegarLoop]: Abstraction has 28421 states and 42910 transitions. [2023-12-02 14:20:37,129 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 5.066666666666666) internal successors, (76), 15 states have internal predecessors, (76), 9 states have call successors, (14), 2 states have call predecessors, (14), 7 states have return successors, (18), 6 states have call predecessors, (18), 9 states have call successors, (18) [2023-12-02 14:20:37,130 INFO L276 IsEmpty]: Start isEmpty. Operand 28421 states and 42910 transitions. [2023-12-02 14:20:37,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-12-02 14:20:37,135 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:20:37,135 INFO L195 NwaCegarLoop]: trace histogram [13, 11, 9, 9, 9, 8, 8, 8, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:20:37,140 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 14:20:37,336 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 14:20:37,336 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:20:37,336 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:20:37,336 INFO L85 PathProgramCache]: Analyzing trace with hash -238144331, now seen corresponding path program 3 times [2023-12-02 14:20:37,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:20:37,337 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328515441] [2023-12-02 14:20:37,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:20:37,337 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:20:37,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:20:37,921 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 187 proven. 179 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 14:20:37,921 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:20:37,922 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328515441] [2023-12-02 14:20:37,922 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1328515441] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:20:37,922 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651752127] [2023-12-02 14:20:37,922 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:20:37,922 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:20:37,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:20:37,923 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:20:37,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 14:20:38,041 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:20:38,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:20:38,043 INFO L262 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 29 conjunts are in the unsatisfiable core [2023-12-02 14:20:38,047 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:20:38,151 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 179 proven. 182 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 14:20:38,151 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:20:39,239 INFO L134 CoverageAnalysis]: Checked inductivity of 403 backedges. 199 proven. 167 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 14:20:39,239 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1651752127] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:20:39,239 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1033246979] [2023-12-02 14:20:39,240 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 14:20:39,241 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:20:39,241 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:20:39,241 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:20:39,241 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 24, 26] total 51 [2023-12-02 14:20:39,241 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141899925] [2023-12-02 14:20:39,241 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:20:39,242 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2023-12-02 14:20:39,242 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:20:39,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2023-12-02 14:20:39,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=2311, Unknown=0, NotChecked=0, Total=2652 [2023-12-02 14:20:39,243 INFO L87 Difference]: Start difference. First operand 28421 states and 42910 transitions. Second operand has 52 states, 51 states have (on average 2.803921568627451) internal successors, (143), 32 states have internal predecessors, (143), 17 states have call successors, (19), 15 states have call predecessors, (19), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:20:42,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:20:42,759 INFO L93 Difference]: Finished difference Result 29622 states and 44574 transitions. [2023-12-02 14:20:42,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-12-02 14:20:42,759 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 2.803921568627451) internal successors, (143), 32 states have internal predecessors, (143), 17 states have call successors, (19), 15 states have call predecessors, (19), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) Word has length 111 [2023-12-02 14:20:42,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:20:42,895 INFO L225 Difference]: With dead ends: 29622 [2023-12-02 14:20:42,895 INFO L226 Difference]: Without dead ends: 29621 [2023-12-02 14:20:42,914 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1819 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1858, Invalid=6514, Unknown=0, NotChecked=0, Total=8372 [2023-12-02 14:20:42,915 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 213 mSDsluCounter, 316 mSDsCounter, 0 mSdLazyCounter, 834 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 962 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 834 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:20:42,915 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [213 Valid, 346 Invalid, 962 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 834 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:20:42,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29621 states. [2023-12-02 14:20:46,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29621 to 28421. [2023-12-02 14:20:46,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28421 states, 18912 states have (on average 1.038917089678511) internal successors, (19648), 18910 states have internal predecessors, (19648), 5531 states have call successors, (5531), 795 states have call predecessors, (5531), 3974 states have return successors, (17686), 8715 states have call predecessors, (17686), 5478 states have call successors, (17686) [2023-12-02 14:20:46,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28421 states to 28421 states and 42865 transitions. [2023-12-02 14:20:46,560 INFO L78 Accepts]: Start accepts. Automaton has 28421 states and 42865 transitions. Word has length 111 [2023-12-02 14:20:46,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:20:46,560 INFO L495 AbstractCegarLoop]: Abstraction has 28421 states and 42865 transitions. [2023-12-02 14:20:46,561 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 2.803921568627451) internal successors, (143), 32 states have internal predecessors, (143), 17 states have call successors, (19), 15 states have call predecessors, (19), 8 states have return successors, (11), 10 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 14:20:46,561 INFO L276 IsEmpty]: Start isEmpty. Operand 28421 states and 42865 transitions. [2023-12-02 14:20:46,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2023-12-02 14:20:46,572 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:20:46,572 INFO L195 NwaCegarLoop]: trace histogram [14, 12, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:20:46,577 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 14:20:46,773 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-12-02 14:20:46,773 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:20:46,773 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:20:46,774 INFO L85 PathProgramCache]: Analyzing trace with hash 1211092801, now seen corresponding path program 4 times [2023-12-02 14:20:46,774 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:20:46,774 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186965854] [2023-12-02 14:20:46,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:20:46,774 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:20:46,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:20:47,474 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 74 proven. 173 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2023-12-02 14:20:47,474 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:20:47,474 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186965854] [2023-12-02 14:20:47,474 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186965854] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:20:47,474 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1512124664] [2023-12-02 14:20:47,475 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:20:47,475 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:20:47,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:20:47,476 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:20:47,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 14:20:47,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:20:47,618 INFO L262 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 39 conjunts are in the unsatisfiable core [2023-12-02 14:20:47,621 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:20:47,712 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 62 proven. 160 refuted. 0 times theorem prover too weak. 270 trivial. 0 not checked. [2023-12-02 14:20:47,712 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:20:52,737 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 74 proven. 223 refuted. 0 times theorem prover too weak. 195 trivial. 0 not checked. [2023-12-02 14:20:52,737 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1512124664] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:20:52,737 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [63675297] [2023-12-02 14:20:52,738 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 14:20:52,739 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:20:52,739 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:20:52,739 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:20:52,739 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23, 33] total 57 [2023-12-02 14:20:52,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035121829] [2023-12-02 14:20:52,740 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:20:52,740 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2023-12-02 14:20:52,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:20:52,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2023-12-02 14:20:52,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=2930, Unknown=0, NotChecked=0, Total=3306 [2023-12-02 14:20:52,742 INFO L87 Difference]: Start difference. First operand 28421 states and 42865 transitions. Second operand has 58 states, 57 states have (on average 1.7017543859649122) internal successors, (97), 44 states have internal predecessors, (97), 13 states have call successors, (15), 3 states have call predecessors, (15), 20 states have return successors, (25), 24 states have call predecessors, (25), 11 states have call successors, (25) [2023-12-02 14:21:15,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:21:15,834 INFO L93 Difference]: Finished difference Result 194513 states and 386435 transitions. [2023-12-02 14:21:15,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 348 states. [2023-12-02 14:21:15,835 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 1.7017543859649122) internal successors, (97), 44 states have internal predecessors, (97), 13 states have call successors, (15), 3 states have call predecessors, (15), 20 states have return successors, (25), 24 states have call predecessors, (25), 11 states have call successors, (25) Word has length 128 [2023-12-02 14:21:15,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:21:17,341 INFO L225 Difference]: With dead ends: 194513 [2023-12-02 14:21:17,341 INFO L226 Difference]: Without dead ends: 191961 [2023-12-02 14:21:17,501 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 635 GetRequests, 235 SyntacticMatches, 0 SemanticMatches, 400 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70646 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=25690, Invalid=135512, Unknown=0, NotChecked=0, Total=161202 [2023-12-02 14:21:17,502 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 592 mSDsluCounter, 308 mSDsCounter, 0 mSdLazyCounter, 844 mSolverCounterSat, 1500 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 592 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 2344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1500 IncrementalHoareTripleChecker+Valid, 844 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:21:17,502 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [592 Valid, 328 Invalid, 2344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1500 Valid, 844 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-12-02 14:21:17,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191961 states. [2023-12-02 14:21:28,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191961 to 50602. [2023-12-02 14:21:28,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50602 states, 32512 states have (on average 1.0257135826771653) internal successors, (33348), 32510 states have internal predecessors, (33348), 10221 states have call successors, (10221), 993 states have call predecessors, (10221), 7865 states have return successors, (44541), 17098 states have call predecessors, (44541), 10149 states have call successors, (44541) [2023-12-02 14:21:28,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50602 states to 50602 states and 88110 transitions. [2023-12-02 14:21:28,769 INFO L78 Accepts]: Start accepts. Automaton has 50602 states and 88110 transitions. Word has length 128 [2023-12-02 14:21:28,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:21:28,770 INFO L495 AbstractCegarLoop]: Abstraction has 50602 states and 88110 transitions. [2023-12-02 14:21:28,770 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 57 states have (on average 1.7017543859649122) internal successors, (97), 44 states have internal predecessors, (97), 13 states have call successors, (15), 3 states have call predecessors, (15), 20 states have return successors, (25), 24 states have call predecessors, (25), 11 states have call successors, (25) [2023-12-02 14:21:28,770 INFO L276 IsEmpty]: Start isEmpty. Operand 50602 states and 88110 transitions. [2023-12-02 14:21:28,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2023-12-02 14:21:28,786 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:21:28,786 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1] [2023-12-02 14:21:28,792 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2023-12-02 14:21:28,986 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-12-02 14:21:28,986 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ackermannErr4ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:21:28,987 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:21:28,987 INFO L85 PathProgramCache]: Analyzing trace with hash 878704996, now seen corresponding path program 2 times [2023-12-02 14:21:28,987 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:21:28,987 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438267650] [2023-12-02 14:21:28,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:21:28,987 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:21:29,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:21:29,568 INFO L134 CoverageAnalysis]: Checked inductivity of 894 backedges. 0 proven. 867 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 14:21:29,569 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:21:29,569 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438267650] [2023-12-02 14:21:29,569 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1438267650] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:21:29,569 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [278375925] [2023-12-02 14:21:29,569 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:21:29,569 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:21:29,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:21:29,570 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:21:29,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 14:21:29,739 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2023-12-02 14:21:29,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:21:29,741 INFO L262 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 42 conjunts are in the unsatisfiable core [2023-12-02 14:21:29,743 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:21:29,872 INFO L134 CoverageAnalysis]: Checked inductivity of 894 backedges. 0 proven. 867 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 14:21:29,872 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:21:30,338 INFO L134 CoverageAnalysis]: Checked inductivity of 894 backedges. 0 proven. 867 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 14:21:30,338 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [278375925] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:21:30,338 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [941888710] [2023-12-02 14:21:30,340 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 14:21:30,340 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:21:30,340 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:21:30,340 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:21:30,341 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2023-12-02 14:21:30,341 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203378770] [2023-12-02 14:21:30,341 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:21:30,341 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2023-12-02 14:21:30,341 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:21:30,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2023-12-02 14:21:30,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=556, Invalid=1700, Unknown=0, NotChecked=0, Total=2256 [2023-12-02 14:21:30,343 INFO L87 Difference]: Start difference. First operand 50602 states and 88110 transitions. Second operand has 48 states, 47 states have (on average 4.319148936170213) internal successors, (203), 26 states have internal predecessors, (203), 22 states have call successors, (40), 22 states have call predecessors, (40), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:21:43,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:21:43,706 INFO L93 Difference]: Finished difference Result 116323 states and 204104 transitions. [2023-12-02 14:21:43,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2023-12-02 14:21:43,707 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 4.319148936170213) internal successors, (203), 26 states have internal predecessors, (203), 22 states have call successors, (40), 22 states have call predecessors, (40), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2023-12-02 14:21:43,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:21:44,190 INFO L225 Difference]: With dead ends: 116323 [2023-12-02 14:21:44,190 INFO L226 Difference]: Without dead ends: 116322 [2023-12-02 14:21:44,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 274 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1830 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=2534, Invalid=5656, Unknown=0, NotChecked=0, Total=8190 [2023-12-02 14:21:44,233 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 1832 mSDsluCounter, 498 mSDsCounter, 0 mSdLazyCounter, 529 mSolverCounterSat, 691 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1835 SdHoareTripleChecker+Valid, 523 SdHoareTripleChecker+Invalid, 1220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 691 IncrementalHoareTripleChecker+Valid, 529 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 14:21:44,234 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1835 Valid, 523 Invalid, 1220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [691 Valid, 529 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 14:21:44,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116322 states. [2023-12-02 14:21:58,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116322 to 116266. [2023-12-02 14:21:58,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116266 states, 74764 states have (on average 1.0261088224279065) internal successors, (76716), 74810 states have internal predecessors, (76716), 23481 states have call successors, (23481), 2313 states have call predecessors, (23481), 18017 states have return successors, (103881), 39142 states have call predecessors, (103881), 23325 states have call successors, (103881) [2023-12-02 14:21:58,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116266 states to 116266 states and 204078 transitions. [2023-12-02 14:21:58,856 INFO L78 Accepts]: Start accepts. Automaton has 116266 states and 204078 transitions. Word has length 140 [2023-12-02 14:21:58,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:21:58,857 INFO L495 AbstractCegarLoop]: Abstraction has 116266 states and 204078 transitions. [2023-12-02 14:21:58,857 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 4.319148936170213) internal successors, (203), 26 states have internal predecessors, (203), 22 states have call successors, (40), 22 states have call predecessors, (40), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:21:58,857 INFO L276 IsEmpty]: Start isEmpty. Operand 116266 states and 204078 transitions. [2023-12-02 14:21:58,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2023-12-02 14:21:58,886 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:21:58,886 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 23, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1] [2023-12-02 14:21:58,893 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-12-02 14:21:59,086 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-12-02 14:21:59,087 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ackermannErr6ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:21:59,087 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:21:59,087 INFO L85 PathProgramCache]: Analyzing trace with hash 343472514, now seen corresponding path program 4 times [2023-12-02 14:21:59,087 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:21:59,087 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610039208] [2023-12-02 14:21:59,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:21:59,087 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:21:59,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:22:00,586 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:22:00,586 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:22:00,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610039208] [2023-12-02 14:22:00,586 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610039208] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:22:00,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976759358] [2023-12-02 14:22:00,586 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:22:00,587 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:22:00,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:22:00,587 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:22:00,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 14:22:00,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:22:00,741 INFO L262 TraceCheckSpWp]: Trace formula consists of 396 conjuncts, 48 conjunts are in the unsatisfiable core [2023-12-02 14:22:00,745 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:22:00,935 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:22:00,935 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:22:02,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:22:02,579 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1976759358] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:22:02,579 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1043143046] [2023-12-02 14:22:02,580 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 14:22:02,580 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:22:02,580 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:22:02,581 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:22:02,581 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2023-12-02 14:22:02,582 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876828825] [2023-12-02 14:22:02,582 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:22:02,582 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2023-12-02 14:22:02,582 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:22:02,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2023-12-02 14:22:02,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2260, Invalid=6860, Unknown=0, NotChecked=0, Total=9120 [2023-12-02 14:22:02,584 INFO L87 Difference]: Start difference. First operand 116266 states and 204078 transitions. Second operand has 96 states, 93 states have (on average 3.4838709677419355) internal successors, (324), 50 states have internal predecessors, (324), 46 states have call successors, (46), 46 states have call predecessors, (46), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:22:25,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:22:25,756 INFO L93 Difference]: Finished difference Result 184935 states and 321142 transitions. [2023-12-02 14:22:25,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2023-12-02 14:22:25,756 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 93 states have (on average 3.4838709677419355) internal successors, (324), 50 states have internal predecessors, (324), 46 states have call successors, (46), 46 states have call predecessors, (46), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 186 [2023-12-02 14:22:25,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:22:26,702 INFO L225 Difference]: With dead ends: 184935 [2023-12-02 14:22:26,702 INFO L226 Difference]: Without dead ends: 184934 [2023-12-02 14:22:26,900 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8376 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=10814, Invalid=23968, Unknown=0, NotChecked=0, Total=34782 [2023-12-02 14:22:26,900 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 2122 mSDsluCounter, 1114 mSDsCounter, 0 mSdLazyCounter, 1170 mSolverCounterSat, 544 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2126 SdHoareTripleChecker+Valid, 1135 SdHoareTripleChecker+Invalid, 1714 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 544 IncrementalHoareTripleChecker+Valid, 1170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 14:22:26,901 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2126 Valid, 1135 Invalid, 1714 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [544 Valid, 1170 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 14:22:27,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184934 states. [2023-12-02 14:22:48,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184934 to 180970. [2023-12-02 14:22:48,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180970 states, 116428 states have (on average 1.0254234376610438) internal successors, (119388), 116426 states have internal predecessors, (119388), 36009 states have call successors, (36009), 3321 states have call predecessors, (36009), 28529 states have return successors, (159873), 61222 states have call predecessors, (159873), 35853 states have call successors, (159873) [2023-12-02 14:22:49,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180970 states to 180970 states and 315270 transitions. [2023-12-02 14:22:49,708 INFO L78 Accepts]: Start accepts. Automaton has 180970 states and 315270 transitions. Word has length 186 [2023-12-02 14:22:49,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:22:49,709 INFO L495 AbstractCegarLoop]: Abstraction has 180970 states and 315270 transitions. [2023-12-02 14:22:49,709 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 93 states have (on average 3.4838709677419355) internal successors, (324), 50 states have internal predecessors, (324), 46 states have call successors, (46), 46 states have call predecessors, (46), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:22:49,709 INFO L276 IsEmpty]: Start isEmpty. Operand 180970 states and 315270 transitions. [2023-12-02 14:22:49,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2023-12-02 14:22:49,765 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:22:49,766 INFO L195 NwaCegarLoop]: trace histogram [30, 21, 21, 17, 17, 17, 17, 16, 16, 9, 9, 9, 9, 9, 9, 8, 8, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2023-12-02 14:22:49,770 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2023-12-02 14:22:49,966 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-12-02 14:22:49,966 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ackermannErr7ASSERT_VIOLATIONINTEGER_OVERFLOW === [ackermannErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, ackermannErr2ASSERT_VIOLATIONINTEGER_OVERFLOW (and 5 more)] === [2023-12-02 14:22:49,966 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:22:49,967 INFO L85 PathProgramCache]: Analyzing trace with hash -1789864936, now seen corresponding path program 1 times [2023-12-02 14:22:49,967 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:22:49,967 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195369414] [2023-12-02 14:22:49,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:22:49,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:22:50,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:22:51,119 INFO L134 CoverageAnalysis]: Checked inductivity of 2360 backedges. 530 proven. 278 refuted. 0 times theorem prover too weak. 1552 trivial. 0 not checked. [2023-12-02 14:22:51,119 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:22:51,119 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195369414] [2023-12-02 14:22:51,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1195369414] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:22:51,119 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396732946] [2023-12-02 14:22:51,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:22:51,119 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:22:51,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:22:51,294 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:22:51,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a81ff09-6f89-4ed4-a132-a9118e856af0/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-12-02 14:22:51,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:22:51,468 INFO L262 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 29 conjunts are in the unsatisfiable core [2023-12-02 14:22:51,472 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:22:51,687 INFO L134 CoverageAnalysis]: Checked inductivity of 2360 backedges. 904 proven. 324 refuted. 0 times theorem prover too weak. 1132 trivial. 0 not checked. [2023-12-02 14:22:51,687 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:22:54,967 INFO L134 CoverageAnalysis]: Checked inductivity of 2360 backedges. 927 proven. 436 refuted. 0 times theorem prover too weak. 997 trivial. 0 not checked. [2023-12-02 14:22:54,967 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1396732946] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:22:54,967 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1019193738] [2023-12-02 14:22:54,969 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 14:22:54,969 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:22:54,969 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 14:22:54,969 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:22:54,969 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 18, 26] total 50 [2023-12-02 14:22:54,970 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646292820] [2023-12-02 14:22:54,970 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:22:54,971 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-12-02 14:22:54,971 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:22:54,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-12-02 14:22:54,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=2192, Unknown=0, NotChecked=0, Total=2450 [2023-12-02 14:22:54,972 INFO L87 Difference]: Start difference. First operand 180970 states and 315270 transitions. Second operand has 50 states, 50 states have (on average 3.12) internal successors, (156), 38 states have internal predecessors, (156), 23 states have call successors, (26), 3 states have call predecessors, (26), 20 states have return successors, (47), 27 states have call predecessors, (47), 21 states have call successors, (47)