./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/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_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 49403db555b72e8190819e443264a1fc2796f8e39e39a8e1b1a8f1697d9e5642 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 16:32:50,116 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 16:32:50,178 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 16:32:50,182 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 16:32:50,183 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 16:32:50,206 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 16:32:50,206 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 16:32:50,207 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 16:32:50,208 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 16:32:50,208 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 16:32:50,209 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 16:32:50,209 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 16:32:50,210 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 16:32:50,210 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 16:32:50,211 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 16:32:50,211 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 16:32:50,212 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 16:32:50,212 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 16:32:50,213 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 16:32:50,213 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 16:32:50,214 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 16:32:50,215 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 16:32:50,216 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 16:32:50,217 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 16:32:50,217 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 16:32:50,218 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 16:32:50,219 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 16:32:50,219 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 16:32:50,220 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 16:32:50,220 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 16:32:50,221 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 16:32:50,221 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 16:32:50,221 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 16:32:50,221 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 16:32:50,222 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 16:32:50,222 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 16:32:50,222 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 16:32:50,222 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:32:50,223 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 16:32:50,223 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 16:32:50,223 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 16:32:50,224 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 16:32:50,224 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 16:32:50,224 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 16:32:50,224 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 16:32:50,224 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 16:32:50,224 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 16:32:50,225 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_e2f2d802-afb7-4a90-9dde-788944aef1cf/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 49403db555b72e8190819e443264a1fc2796f8e39e39a8e1b1a8f1697d9e5642 [2023-12-02 16:32:50,443 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 16:32:50,462 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 16:32:50,465 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 16:32:50,466 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 16:32:50,466 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 16:32:50,468 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i [2023-12-02 16:32:53,181 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 16:32:53,344 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 16:32:53,344 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i [2023-12-02 16:32:53,351 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/data/b06683877/017ccb654e3940edb70a62b4ea287947/FLAG60921bdd3 [2023-12-02 16:32:53,364 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/data/b06683877/017ccb654e3940edb70a62b4ea287947 [2023-12-02 16:32:53,366 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 16:32:53,368 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 16:32:53,369 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 16:32:53,369 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 16:32:53,374 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 16:32:53,374 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:32:53" (1/1) ... [2023-12-02 16:32:53,375 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75394ffe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:32:53, skipping insertion in model container [2023-12-02 16:32:53,375 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:32:53" (1/1) ... [2023-12-02 16:32:53,394 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 16:32:53,513 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i[823,836] [2023-12-02 16:32:53,533 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:32:53,541 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 16:32:53,551 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i[823,836] [2023-12-02 16:32:53,564 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:32:53,576 INFO L206 MainTranslator]: Completed translation [2023-12-02 16:32:53,577 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:32:53 WrapperNode [2023-12-02 16:32:53,577 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 16:32:53,578 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 16:32:53,578 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 16:32:53,578 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 16:32:53,584 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:32:53" (1/1) ... [2023-12-02 16:32:53,591 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:32:53" (1/1) ... [2023-12-02 16:32:53,610 INFO L138 Inliner]: procedures = 16, calls = 25, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 117 [2023-12-02 16:32:53,610 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 16:32:53,611 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 16:32:53,611 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 16:32:53,611 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 16:32:53,619 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:32:53" (1/1) ... [2023-12-02 16:32:53,619 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:32:53" (1/1) ... [2023-12-02 16:32:53,622 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:32:53" (1/1) ... [2023-12-02 16:32:53,622 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:32:53" (1/1) ... [2023-12-02 16:32:53,628 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:32:53" (1/1) ... [2023-12-02 16:32:53,633 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:32:53" (1/1) ... [2023-12-02 16:32:53,634 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:32:53" (1/1) ... [2023-12-02 16:32:53,636 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:32:53" (1/1) ... [2023-12-02 16:32:53,638 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 16:32:53,639 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 16:32:53,639 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 16:32:53,639 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 16:32:53,640 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:32:53" (1/1) ... [2023-12-02 16:32:53,646 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:32:53,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:32:53,667 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 16:32:53,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 16:32:53,698 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 16:32:53,698 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 16:32:53,698 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 16:32:53,698 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 16:32:53,698 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 16:32:53,699 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 16:32:53,699 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 16:32:53,699 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-12-02 16:32:53,699 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-12-02 16:32:53,699 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 16:32:53,768 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 16:32:53,771 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 16:32:53,946 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 16:32:54,015 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 16:32:54,016 INFO L309 CfgBuilder]: Removed 8 assume(true) statements. [2023-12-02 16:32:54,017 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:32:54 BoogieIcfgContainer [2023-12-02 16:32:54,018 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 16:32:54,021 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 16:32:54,021 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 16:32:54,024 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 16:32:54,025 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 04:32:53" (1/3) ... [2023-12-02 16:32:54,025 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@711f441d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:32:54, skipping insertion in model container [2023-12-02 16:32:54,025 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:32:53" (2/3) ... [2023-12-02 16:32:54,026 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@711f441d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:32:54, skipping insertion in model container [2023-12-02 16:32:54,026 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:32:54" (3/3) ... [2023-12-02 16:32:54,027 INFO L112 eAbstractionObserver]: Analyzing ICFG sorting_selectionsort_ground-2.i [2023-12-02 16:32:54,047 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 16:32:54,047 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 16:32:54,095 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 16:32:54,103 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;@7e25c168, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 16:32:54,103 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 16:32:54,107 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-12-02 16:32:54,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 16:32:54,115 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:32:54,116 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:32:54,117 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:32:54,122 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:32:54,122 INFO L85 PathProgramCache]: Analyzing trace with hash -295987307, now seen corresponding path program 1 times [2023-12-02 16:32:54,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:32:54,133 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576768386] [2023-12-02 16:32:54,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:32:54,134 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:32:54,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:32:54,323 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 16:32:54,324 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:32:54,324 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576768386] [2023-12-02 16:32:54,325 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1576768386] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:32:54,325 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:32:54,325 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 16:32:54,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862912150] [2023-12-02 16:32:54,328 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:32:54,332 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:32:54,332 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:32:54,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:32:54,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:32:54,363 INFO L87 Difference]: Start difference. First operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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 16:32:54,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:32:54,421 INFO L93 Difference]: Finished difference Result 43 states and 66 transitions. [2023-12-02 16:32:54,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:32:54,423 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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 16:32:54,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:32:54,429 INFO L225 Difference]: With dead ends: 43 [2023-12-02 16:32:54,429 INFO L226 Difference]: Without dead ends: 22 [2023-12-02 16:32:54,432 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:32:54,435 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:32:54,437 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:32:54,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-12-02 16:32:54,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-12-02 16:32:54,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 17 states have internal predecessors, (25), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-12-02 16:32:54,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 31 transitions. [2023-12-02 16:32:54,475 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 31 transitions. Word has length 9 [2023-12-02 16:32:54,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:32:54,476 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 31 transitions. [2023-12-02 16:32:54,476 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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 16:32:54,476 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 31 transitions. [2023-12-02 16:32:54,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-12-02 16:32:54,477 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:32:54,477 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:32:54,478 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 16:32:54,478 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:32:54,479 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:32:54,479 INFO L85 PathProgramCache]: Analyzing trace with hash 1716688572, now seen corresponding path program 1 times [2023-12-02 16:32:54,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:32:54,480 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466896247] [2023-12-02 16:32:54,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:32:54,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:32:54,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:32:54,563 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:32:54,564 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:32:54,564 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466896247] [2023-12-02 16:32:54,564 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466896247] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:32:54,564 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1887247529] [2023-12-02 16:32:54,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:32:54,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:32:54,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:32:54,567 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:32:54,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 16:32:54,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:32:54,636 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:32:54,640 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:32:54,659 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:32:54,659 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:32:54,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1887247529] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:32:54,660 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:32:54,660 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2023-12-02 16:32:54,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477054937] [2023-12-02 16:32:54,661 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:32:54,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:32:54,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:32:54,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:32:54,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 16:32:54,663 INFO L87 Difference]: Start difference. First operand 22 states and 31 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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 16:32:54,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:32:54,716 INFO L93 Difference]: Finished difference Result 41 states and 58 transitions. [2023-12-02 16:32:54,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:32:54,717 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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 10 [2023-12-02 16:32:54,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:32:54,718 INFO L225 Difference]: With dead ends: 41 [2023-12-02 16:32:54,718 INFO L226 Difference]: Without dead ends: 31 [2023-12-02 16:32:54,718 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 16:32:54,720 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 11 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:32:54,720 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 26 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:32:54,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-12-02 16:32:54,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 23. [2023-12-02 16:32:54,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 18 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-12-02 16:32:54,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 32 transitions. [2023-12-02 16:32:54,728 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 32 transitions. Word has length 10 [2023-12-02 16:32:54,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:32:54,729 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 32 transitions. [2023-12-02 16:32:54,729 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 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 16:32:54,729 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 32 transitions. [2023-12-02 16:32:54,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 16:32:54,730 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:32:54,730 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:32:54,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 16:32:54,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-12-02 16:32:54,940 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:32:54,940 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:32:54,941 INFO L85 PathProgramCache]: Analyzing trace with hash 1686478395, now seen corresponding path program 1 times [2023-12-02 16:32:54,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:32:54,941 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392700109] [2023-12-02 16:32:54,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:32:54,941 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:32:54,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:32:55,012 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:32:55,012 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:32:55,013 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392700109] [2023-12-02 16:32:55,013 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1392700109] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:32:55,013 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1304865927] [2023-12-02 16:32:55,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:32:55,013 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:32:55,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:32:55,015 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:32:55,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 16:32:55,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:32:55,081 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:32:55,083 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:32:55,109 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:32:55,110 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:32:55,129 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:32:55,129 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1304865927] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:32:55,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1264758434] [2023-12-02 16:32:55,149 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 16:32:55,149 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:32:55,153 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:32:55,158 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:32:55,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:32:55,466 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:32:55,541 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1264758434] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:32:55,541 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:32:55,542 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 9 [2023-12-02 16:32:55,542 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049372000] [2023-12-02 16:32:55,542 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:32:55,543 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 16:32:55,543 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:32:55,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 16:32:55,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:32:55,544 INFO L87 Difference]: Start difference. First operand 23 states and 32 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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 16:32:55,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:32:55,628 INFO L93 Difference]: Finished difference Result 51 states and 75 transitions. [2023-12-02 16:32:55,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 16:32:55,628 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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 11 [2023-12-02 16:32:55,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:32:55,629 INFO L225 Difference]: With dead ends: 51 [2023-12-02 16:32:55,629 INFO L226 Difference]: Without dead ends: 32 [2023-12-02 16:32:55,630 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:32:55,631 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 10 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:32:55,632 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 23 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:32:55,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-12-02 16:32:55,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2023-12-02 16:32:55,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 states have internal predecessors, (27), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-12-02 16:32:55,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2023-12-02 16:32:55,639 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 11 [2023-12-02 16:32:55,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:32:55,639 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2023-12-02 16:32:55,640 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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 16:32:55,640 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2023-12-02 16:32:55,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-12-02 16:32:55,640 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:32:55,640 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:32:55,645 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 16:32:55,843 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-12-02 16:32:55,843 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:32:55,844 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:32:55,844 INFO L85 PathProgramCache]: Analyzing trace with hash -402000641, now seen corresponding path program 1 times [2023-12-02 16:32:55,844 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:32:55,844 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1140600242] [2023-12-02 16:32:55,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:32:55,845 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:32:55,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:32:55,904 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:32:55,904 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:32:55,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1140600242] [2023-12-02 16:32:55,904 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1140600242] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:32:55,905 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [369367917] [2023-12-02 16:32:55,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:32:55,905 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:32:55,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:32:55,906 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:32:55,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 16:32:55,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:32:55,966 INFO L262 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:32:55,968 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:32:55,980 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:32:55,980 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:32:55,997 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:32:55,997 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [369367917] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:32:55,997 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1618302517] [2023-12-02 16:32:56,000 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 16:32:56,000 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:32:56,000 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:32:56,001 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:32:56,001 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:32:56,226 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-12-02 16:32:56,246 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:32:56,462 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1618302517] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:32:56,462 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:32:56,462 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [3, 3, 3] total 14 [2023-12-02 16:32:56,463 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059761655] [2023-12-02 16:32:56,463 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:32:56,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 16:32:56,464 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:32:56,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 16:32:56,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=143, Unknown=1, NotChecked=0, Total=182 [2023-12-02 16:32:56,465 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 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 16:32:56,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:32:56,873 INFO L93 Difference]: Finished difference Result 62 states and 90 transitions. [2023-12-02 16:32:56,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 16:32:56,874 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 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 12 [2023-12-02 16:32:56,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:32:56,875 INFO L225 Difference]: With dead ends: 62 [2023-12-02 16:32:56,875 INFO L226 Difference]: Without dead ends: 43 [2023-12-02 16:32:56,875 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=50, Invalid=189, Unknown=1, NotChecked=0, Total=240 [2023-12-02 16:32:56,876 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 16 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 8 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:32:56,877 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 58 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 162 Invalid, 7 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 16:32:56,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2023-12-02 16:32:56,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 33. [2023-12-02 16:32:56,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 27 states have internal predecessors, (36), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 16:32:56,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2023-12-02 16:32:56,887 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 12 [2023-12-02 16:32:56,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:32:56,888 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2023-12-02 16:32:56,888 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 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 16:32:56,888 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2023-12-02 16:32:56,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-12-02 16:32:56,889 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:32:56,889 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:32:56,894 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 16:32:57,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-12-02 16:32:57,091 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:32:57,092 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:32:57,092 INFO L85 PathProgramCache]: Analyzing trace with hash -1351031162, now seen corresponding path program 1 times [2023-12-02 16:32:57,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:32:57,092 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292051620] [2023-12-02 16:32:57,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:32:57,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:32:57,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:32:57,152 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 16:32:57,152 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:32:57,153 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292051620] [2023-12-02 16:32:57,153 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1292051620] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:32:57,153 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [511536531] [2023-12-02 16:32:57,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:32:57,153 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:32:57,153 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:32:57,154 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:32:57,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 16:32:57,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:32:57,220 INFO L262 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 16:32:57,221 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:32:57,231 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 16:32:57,231 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:32:57,251 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 16:32:57,251 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [511536531] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:32:57,251 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [576331890] [2023-12-02 16:32:57,254 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:32:57,254 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:32:57,255 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:32:57,255 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:32:57,255 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:32:57,539 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 16:32:57,546 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:32:57,672 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '809#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:32:57,672 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:32:57,672 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:32:57,672 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 4] total 7 [2023-12-02 16:32:57,672 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109662948] [2023-12-02 16:32:57,672 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:32:57,673 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 16:32:57,673 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:32:57,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 16:32:57,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=193, Unknown=1, NotChecked=0, Total=240 [2023-12-02 16:32:57,674 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:32:57,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:32:57,726 INFO L93 Difference]: Finished difference Result 66 states and 90 transitions. [2023-12-02 16:32:57,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 16:32:57,727 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2023-12-02 16:32:57,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:32:57,729 INFO L225 Difference]: With dead ends: 66 [2023-12-02 16:32:57,729 INFO L226 Difference]: Without dead ends: 36 [2023-12-02 16:32:57,729 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=193, Unknown=1, NotChecked=0, Total=240 [2023-12-02 16:32:57,730 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:32:57,731 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 68 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:32:57,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-12-02 16:32:57,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2023-12-02 16:32:57,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 30 states have internal predecessors, (39), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 16:32:57,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 47 transitions. [2023-12-02 16:32:57,740 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 47 transitions. Word has length 19 [2023-12-02 16:32:57,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:32:57,740 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 47 transitions. [2023-12-02 16:32:57,741 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:32:57,741 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 47 transitions. [2023-12-02 16:32:57,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-12-02 16:32:57,742 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:32:57,742 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:32:57,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-12-02 16:32:57,947 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:32:57,947 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:32:57,947 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:32:57,947 INFO L85 PathProgramCache]: Analyzing trace with hash -347164659, now seen corresponding path program 2 times [2023-12-02 16:32:57,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:32:57,948 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236152865] [2023-12-02 16:32:57,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:32:57,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:32:57,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:32:58,068 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 16:32:58,068 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:32:58,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236152865] [2023-12-02 16:32:58,068 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [236152865] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:32:58,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [982442694] [2023-12-02 16:32:58,068 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:32:58,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:32:58,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:32:58,071 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:32:58,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 16:32:58,145 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 16:32:58,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:32:58,146 INFO L262 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 16:32:58,148 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:32:58,172 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-12-02 16:32:58,172 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:32:58,207 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 16:32:58,207 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [982442694] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:32:58,207 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2096314624] [2023-12-02 16:32:58,210 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:32:58,210 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:32:58,211 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:32:58,211 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:32:58,211 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:32:58,497 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 16:32:58,503 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:32:58,672 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1126#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:32:58,673 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:32:58,673 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:32:58,673 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 13 [2023-12-02 16:32:58,673 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319396000] [2023-12-02 16:32:58,673 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:32:58,674 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 16:32:58,674 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:32:58,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 16:32:58,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=386, Unknown=3, NotChecked=0, Total=462 [2023-12-02 16:32:58,675 INFO L87 Difference]: Start difference. First operand 36 states and 47 transitions. Second operand has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:32:58,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:32:58,925 INFO L93 Difference]: Finished difference Result 89 states and 128 transitions. [2023-12-02 16:32:58,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-12-02 16:32:58,925 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 22 [2023-12-02 16:32:58,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:32:58,926 INFO L225 Difference]: With dead ends: 89 [2023-12-02 16:32:58,926 INFO L226 Difference]: Without dead ends: 59 [2023-12-02 16:32:58,928 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=885, Unknown=4, NotChecked=0, Total=1056 [2023-12-02 16:32:58,928 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 44 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:32:58,929 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 78 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:32:58,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-12-02 16:32:58,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 48. [2023-12-02 16:32:58,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 39 states have (on average 1.2820512820512822) internal successors, (50), 41 states have internal predecessors, (50), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:32:58,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 62 transitions. [2023-12-02 16:32:58,941 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 62 transitions. Word has length 22 [2023-12-02 16:32:58,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:32:58,941 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 62 transitions. [2023-12-02 16:32:58,941 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:32:58,942 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 62 transitions. [2023-12-02 16:32:58,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-12-02 16:32:58,942 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:32:58,943 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:32:58,948 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 16:32:59,147 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-12-02 16:32:59,147 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:32:59,148 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:32:59,148 INFO L85 PathProgramCache]: Analyzing trace with hash -181553398, now seen corresponding path program 3 times [2023-12-02 16:32:59,148 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:32:59,148 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686370806] [2023-12-02 16:32:59,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:32:59,148 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:32:59,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:32:59,273 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 16:32:59,273 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:32:59,273 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686370806] [2023-12-02 16:32:59,273 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686370806] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:32:59,273 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364618108] [2023-12-02 16:32:59,273 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:32:59,273 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:32:59,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:32:59,274 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:32:59,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 16:32:59,349 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:32:59,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:32:59,350 INFO L262 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 16:32:59,352 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:32:59,373 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-12-02 16:32:59,374 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:32:59,461 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 16:32:59,461 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364618108] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:32:59,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [484399189] [2023-12-02 16:32:59,464 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:32:59,464 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:32:59,464 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:32:59,464 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:32:59,465 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:32:59,681 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 16:32:59,686 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:32:59,848 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1557#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:32:59,848 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:32:59,848 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:32:59,849 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 8] total 15 [2023-12-02 16:32:59,849 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337113237] [2023-12-02 16:32:59,849 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:32:59,849 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-12-02 16:32:59,850 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:32:59,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-12-02 16:32:59,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=419, Unknown=3, NotChecked=0, Total=552 [2023-12-02 16:32:59,851 INFO L87 Difference]: Start difference. First operand 48 states and 62 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:32:59,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:32:59,922 INFO L93 Difference]: Finished difference Result 96 states and 130 transitions. [2023-12-02 16:32:59,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 16:32:59,923 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 26 [2023-12-02 16:32:59,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:32:59,923 INFO L225 Difference]: With dead ends: 96 [2023-12-02 16:32:59,924 INFO L226 Difference]: Without dead ends: 55 [2023-12-02 16:32:59,924 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=130, Invalid=419, Unknown=3, NotChecked=0, Total=552 [2023-12-02 16:32:59,925 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:32:59,926 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 85 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:32:59,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2023-12-02 16:32:59,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2023-12-02 16:32:59,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 46 states have (on average 1.2391304347826086) internal successors, (57), 48 states have internal predecessors, (57), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:32:59,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 69 transitions. [2023-12-02 16:32:59,938 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 69 transitions. Word has length 26 [2023-12-02 16:32:59,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:32:59,938 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 69 transitions. [2023-12-02 16:32:59,938 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:32:59,938 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 69 transitions. [2023-12-02 16:32:59,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-12-02 16:32:59,939 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:32:59,940 INFO L195 NwaCegarLoop]: trace histogram [12, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:32:59,945 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 16:33:00,143 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:33:00,143 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:33:00,144 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:33:00,144 INFO L85 PathProgramCache]: Analyzing trace with hash 1930570083, now seen corresponding path program 4 times [2023-12-02 16:33:00,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:33:00,144 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [698308165] [2023-12-02 16:33:00,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:33:00,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:33:00,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:33:00,491 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 16:33:00,491 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:33:00,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [698308165] [2023-12-02 16:33:00,491 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [698308165] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:33:00,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968518033] [2023-12-02 16:33:00,491 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 16:33:00,492 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:33:00,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:33:00,493 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:33:00,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 16:33:00,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:33:00,595 INFO L262 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 16:33:00,598 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:33:00,625 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-12-02 16:33:00,625 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:33:00,884 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 16:33:00,885 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968518033] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:33:00,885 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [130863816] [2023-12-02 16:33:00,887 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:33:00,887 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:33:00,888 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:33:00,888 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:33:00,888 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:33:01,111 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 16:33:01,116 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:33:01,297 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2051#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:33:01,298 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:33:01,298 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:33:01,298 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 15] total 29 [2023-12-02 16:33:01,298 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086477238] [2023-12-02 16:33:01,298 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:33:01,299 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-12-02 16:33:01,299 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:33:01,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-12-02 16:33:01,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=431, Invalid=974, Unknown=1, NotChecked=0, Total=1406 [2023-12-02 16:33:01,301 INFO L87 Difference]: Start difference. First operand 55 states and 69 transitions. Second operand has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:33:01,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:33:01,387 INFO L93 Difference]: Finished difference Result 110 states and 151 transitions. [2023-12-02 16:33:01,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-12-02 16:33:01,388 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 33 [2023-12-02 16:33:01,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:33:01,389 INFO L225 Difference]: With dead ends: 110 [2023-12-02 16:33:01,389 INFO L226 Difference]: Without dead ends: 69 [2023-12-02 16:33:01,390 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 411 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=431, Invalid=974, Unknown=1, NotChecked=0, Total=1406 [2023-12-02 16:33:01,391 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:33:01,392 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 102 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:33:01,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-12-02 16:33:01,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2023-12-02 16:33:01,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 60 states have (on average 1.1833333333333333) internal successors, (71), 62 states have internal predecessors, (71), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:33:01,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 83 transitions. [2023-12-02 16:33:01,406 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 83 transitions. Word has length 33 [2023-12-02 16:33:01,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:33:01,406 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 83 transitions. [2023-12-02 16:33:01,406 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:33:01,406 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 83 transitions. [2023-12-02 16:33:01,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 16:33:01,408 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:33:01,408 INFO L195 NwaCegarLoop]: trace histogram [26, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:33:01,414 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 16:33:01,611 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-12-02 16:33:01,611 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:33:01,612 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:33:01,612 INFO L85 PathProgramCache]: Analyzing trace with hash 24048515, now seen corresponding path program 5 times [2023-12-02 16:33:01,612 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:33:01,612 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969259015] [2023-12-02 16:33:01,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:33:01,612 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:33:01,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:33:02,429 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 2 proven. 351 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 16:33:02,429 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:33:02,429 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969259015] [2023-12-02 16:33:02,430 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [969259015] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:33:02,430 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539280711] [2023-12-02 16:33:02,430 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:33:02,430 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:33:02,430 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:33:02,432 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:33:02,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 16:33:02,532 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 16:33:02,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:33:02,533 INFO L262 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 16:33:02,536 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:33:02,638 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2023-12-02 16:33:02,638 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:33:02,743 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 353 trivial. 0 not checked. [2023-12-02 16:33:02,744 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [539280711] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:33:02,744 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [369209072] [2023-12-02 16:33:02,746 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:33:02,746 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:33:02,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:33:02,746 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:33:02,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:33:02,902 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 16:33:02,907 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:33:03,181 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2697#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:33:03,182 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:33:03,182 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:33:03,182 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 8, 8] total 41 [2023-12-02 16:33:03,182 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743182201] [2023-12-02 16:33:03,182 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:33:03,183 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2023-12-02 16:33:03,183 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:33:03,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2023-12-02 16:33:03,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=509, Invalid=1938, Unknown=3, NotChecked=0, Total=2450 [2023-12-02 16:33:03,185 INFO L87 Difference]: Start difference. First operand 69 states and 83 transitions. Second operand has 41 states, 41 states have (on average 1.4146341463414633) internal successors, (58), 41 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:33:04,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:33:04,104 INFO L93 Difference]: Finished difference Result 131 states and 176 transitions. [2023-12-02 16:33:04,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-12-02 16:33:04,104 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.4146341463414633) internal successors, (58), 41 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 47 [2023-12-02 16:33:04,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:33:04,105 INFO L225 Difference]: With dead ends: 131 [2023-12-02 16:33:04,105 INFO L226 Difference]: Without dead ends: 90 [2023-12-02 16:33:04,109 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1833 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1566, Invalid=6799, Unknown=7, NotChecked=0, Total=8372 [2023-12-02 16:33:04,110 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 59 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:33:04,110 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 165 Invalid, 238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:33:04,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2023-12-02 16:33:04,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 79. [2023-12-02 16:33:04,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 70 states have (on average 1.1571428571428573) internal successors, (81), 72 states have internal predecessors, (81), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:33:04,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 93 transitions. [2023-12-02 16:33:04,125 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 93 transitions. Word has length 47 [2023-12-02 16:33:04,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:33:04,125 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 93 transitions. [2023-12-02 16:33:04,125 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.4146341463414633) internal successors, (58), 41 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:33:04,125 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 93 transitions. [2023-12-02 16:33:04,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-12-02 16:33:04,127 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:33:04,127 INFO L195 NwaCegarLoop]: trace histogram [27, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:33:04,133 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-12-02 16:33:04,329 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-12-02 16:33:04,330 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:33:04,330 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:33:04,330 INFO L85 PathProgramCache]: Analyzing trace with hash -291812374, now seen corresponding path program 6 times [2023-12-02 16:33:04,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:33:04,330 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885954592] [2023-12-02 16:33:04,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:33:04,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:33:04,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:33:04,987 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 2 proven. 378 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-12-02 16:33:04,987 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:33:04,987 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885954592] [2023-12-02 16:33:04,987 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1885954592] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:33:04,987 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1791658587] [2023-12-02 16:33:04,987 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:33:04,987 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:33:04,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:33:04,988 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:33:04,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 16:33:05,117 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:33:05,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:33:05,120 INFO L262 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 29 conjunts are in the unsatisfiable core [2023-12-02 16:33:05,124 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:33:05,183 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2023-12-02 16:33:05,183 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:33:06,099 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 2 proven. 378 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-12-02 16:33:06,100 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1791658587] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:33:06,100 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [309473522] [2023-12-02 16:33:06,102 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:33:06,102 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:33:06,102 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:33:06,102 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:33:06,102 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:33:06,235 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 16:33:06,239 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:33:06,512 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3547#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:33:06,512 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:33:06,512 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:33:06,512 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 30] total 59 [2023-12-02 16:33:06,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735708861] [2023-12-02 16:33:06,512 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:33:06,513 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2023-12-02 16:33:06,513 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:33:06,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2023-12-02 16:33:06,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1736, Invalid=2817, Unknown=3, NotChecked=0, Total=4556 [2023-12-02 16:33:06,516 INFO L87 Difference]: Start difference. First operand 79 states and 93 transitions. Second operand has 59 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 59 states have internal predecessors, (74), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:33:06,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:33:06,630 INFO L93 Difference]: Finished difference Result 158 states and 214 transitions. [2023-12-02 16:33:06,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2023-12-02 16:33:06,630 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 59 states have internal predecessors, (74), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 54 [2023-12-02 16:33:06,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:33:06,631 INFO L225 Difference]: With dead ends: 158 [2023-12-02 16:33:06,632 INFO L226 Difference]: Without dead ends: 108 [2023-12-02 16:33:06,634 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 874 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1736, Invalid=2817, Unknown=3, NotChecked=0, Total=4556 [2023-12-02 16:33:06,634 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:33:06,635 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 85 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:33:06,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2023-12-02 16:33:06,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2023-12-02 16:33:06,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 99 states have (on average 1.1111111111111112) internal successors, (110), 101 states have internal predecessors, (110), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:33:06,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 122 transitions. [2023-12-02 16:33:06,652 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 122 transitions. Word has length 54 [2023-12-02 16:33:06,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:33:06,652 INFO L495 AbstractCegarLoop]: Abstraction has 108 states and 122 transitions. [2023-12-02 16:33:06,652 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 59 states have internal predecessors, (74), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:33:06,653 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 122 transitions. [2023-12-02 16:33:06,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2023-12-02 16:33:06,655 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:33:06,655 INFO L195 NwaCegarLoop]: trace histogram [56, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:33:06,661 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 16:33:06,859 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:33:06,859 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:33:06,860 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:33:06,860 INFO L85 PathProgramCache]: Analyzing trace with hash 1113844835, now seen corresponding path program 7 times [2023-12-02 16:33:06,860 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:33:06,860 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [182913215] [2023-12-02 16:33:06,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:33:06,860 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:33:06,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:33:09,071 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 2 proven. 1596 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-12-02 16:33:09,071 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:33:09,071 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [182913215] [2023-12-02 16:33:09,071 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [182913215] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:33:09,071 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1285354487] [2023-12-02 16:33:09,071 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 16:33:09,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:33:09,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:33:09,072 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:33:09,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 16:33:09,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:33:09,247 INFO L262 TraceCheckSpWp]: Trace formula consists of 627 conjuncts, 58 conjunts are in the unsatisfiable core [2023-12-02 16:33:09,251 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:33:09,325 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2023-12-02 16:33:09,325 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:33:12,457 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 2 proven. 1596 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-12-02 16:33:12,457 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1285354487] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:33:12,457 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [681351478] [2023-12-02 16:33:12,459 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:33:12,459 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:33:12,459 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:33:12,459 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:33:12,460 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:33:12,620 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 16:33:12,624 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:33:12,973 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4659#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:33:12,973 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:33:12,974 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:33:12,974 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 59] total 117 [2023-12-02 16:33:12,974 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519026307] [2023-12-02 16:33:12,974 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:33:12,975 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2023-12-02 16:33:12,975 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:33:12,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2023-12-02 16:33:12,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6811, Invalid=8936, Unknown=3, NotChecked=0, Total=15750 [2023-12-02 16:33:12,984 INFO L87 Difference]: Start difference. First operand 108 states and 122 transitions. Second operand has 117 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 117 states have internal predecessors, (132), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:33:13,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:33:13,185 INFO L93 Difference]: Finished difference Result 216 states and 301 transitions. [2023-12-02 16:33:13,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2023-12-02 16:33:13,186 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 117 states have internal predecessors, (132), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 83 [2023-12-02 16:33:13,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:33:13,187 INFO L225 Difference]: With dead ends: 216 [2023-12-02 16:33:13,187 INFO L226 Difference]: Without dead ends: 166 [2023-12-02 16:33:13,194 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1772 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=6811, Invalid=8936, Unknown=3, NotChecked=0, Total=15750 [2023-12-02 16:33:13,195 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:33:13,195 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 136 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:33:13,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2023-12-02 16:33:13,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2023-12-02 16:33:13,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 157 states have (on average 1.070063694267516) internal successors, (168), 159 states have internal predecessors, (168), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:33:13,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 180 transitions. [2023-12-02 16:33:13,218 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 180 transitions. Word has length 83 [2023-12-02 16:33:13,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:33:13,218 INFO L495 AbstractCegarLoop]: Abstraction has 166 states and 180 transitions. [2023-12-02 16:33:13,219 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 117 states have internal predecessors, (132), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:33:13,219 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 180 transitions. [2023-12-02 16:33:13,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2023-12-02 16:33:13,220 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:33:13,220 INFO L195 NwaCegarLoop]: trace histogram [114, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:33:13,225 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 16:33:13,420 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-12-02 16:33:13,421 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:33:13,421 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:33:13,421 INFO L85 PathProgramCache]: Analyzing trace with hash 808112579, now seen corresponding path program 8 times [2023-12-02 16:33:13,421 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:33:13,421 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272323537] [2023-12-02 16:33:13,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:33:13,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:33:13,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:33:20,366 INFO L134 CoverageAnalysis]: Checked inductivity of 6614 backedges. 2 proven. 6555 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-12-02 16:33:20,366 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:33:20,366 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272323537] [2023-12-02 16:33:20,366 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [272323537] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:33:20,366 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1904051375] [2023-12-02 16:33:20,366 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:33:20,367 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:33:20,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:33:20,367 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:33:20,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 16:33:20,605 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-12-02 16:33:20,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:33:20,608 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 13 conjunts are in the unsatisfiable core [2023-12-02 16:33:20,611 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:33:21,126 INFO L134 CoverageAnalysis]: Checked inductivity of 6614 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 6559 trivial. 0 not checked. [2023-12-02 16:33:21,126 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:33:21,719 INFO L134 CoverageAnalysis]: Checked inductivity of 6614 backedges. 2 proven. 55 refuted. 0 times theorem prover too weak. 6557 trivial. 0 not checked. [2023-12-02 16:33:21,719 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1904051375] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:33:21,719 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [122286141] [2023-12-02 16:33:21,721 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:33:21,721 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:33:21,721 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:33:21,722 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:33:21,722 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:33:21,858 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 16:33:21,862 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:33:22,441 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6375#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:33:22,441 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:33:22,441 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:33:22,442 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 14, 14] total 141 [2023-12-02 16:33:22,442 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185792190] [2023-12-02 16:33:22,442 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:33:22,442 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 141 states [2023-12-02 16:33:22,442 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:33:22,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 141 interpolants. [2023-12-02 16:33:22,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7099, Invalid=15247, Unknown=4, NotChecked=0, Total=22350 [2023-12-02 16:33:22,449 INFO L87 Difference]: Start difference. First operand 166 states and 180 transitions. Second operand has 141 states, 141 states have (on average 1.1205673758865249) internal successors, (158), 141 states have internal predecessors, (158), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:33:30,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:33:30,127 INFO L93 Difference]: Finished difference Result 246 states and 300 transitions. [2023-12-02 16:33:30,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 152 states. [2023-12-02 16:33:30,128 INFO L78 Accepts]: Start accepts. Automaton has has 141 states, 141 states have (on average 1.1205673758865249) internal successors, (158), 141 states have internal predecessors, (158), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 141 [2023-12-02 16:33:30,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:33:30,130 INFO L225 Difference]: With dead ends: 246 [2023-12-02 16:33:30,130 INFO L226 Difference]: Without dead ends: 196 [2023-12-02 16:33:30,139 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 686 GetRequests, 390 SyntacticMatches, 0 SemanticMatches, 296 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16701 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=21697, Invalid=66778, Unknown=31, NotChecked=0, Total=88506 [2023-12-02 16:33:30,139 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 165 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 301 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 301 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:33:30,140 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [168 Valid, 137 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 301 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:33:30,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2023-12-02 16:33:30,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 185. [2023-12-02 16:33:30,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 176 states have (on average 1.0625) internal successors, (187), 178 states have internal predecessors, (187), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:33:30,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 199 transitions. [2023-12-02 16:33:30,164 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 199 transitions. Word has length 141 [2023-12-02 16:33:30,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:33:30,164 INFO L495 AbstractCegarLoop]: Abstraction has 185 states and 199 transitions. [2023-12-02 16:33:30,164 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 141 states, 141 states have (on average 1.1205673758865249) internal successors, (158), 141 states have internal predecessors, (158), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:33:30,164 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 199 transitions. [2023-12-02 16:33:30,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2023-12-02 16:33:30,166 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:33:30,166 INFO L195 NwaCegarLoop]: trace histogram [115, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:33:30,171 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 16:33:30,367 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 16:33:30,367 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:33:30,367 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:33:30,367 INFO L85 PathProgramCache]: Analyzing trace with hash 2045473386, now seen corresponding path program 9 times [2023-12-02 16:33:30,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:33:30,367 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793821075] [2023-12-02 16:33:30,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:33:30,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:33:30,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:33:37,675 INFO L134 CoverageAnalysis]: Checked inductivity of 6927 backedges. 2 proven. 6670 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2023-12-02 16:33:37,675 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:33:37,675 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793821075] [2023-12-02 16:33:37,675 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [793821075] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:33:37,675 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1560595094] [2023-12-02 16:33:37,675 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:33:37,675 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:33:37,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:33:37,676 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:33:37,677 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 16:33:37,979 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:33:37,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:33:37,986 INFO L262 TraceCheckSpWp]: Trace formula consists of 1206 conjuncts, 117 conjunts are in the unsatisfiable core [2023-12-02 16:33:37,991 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:33:38,123 INFO L134 CoverageAnalysis]: Checked inductivity of 6927 backedges. 0 proven. 6670 refuted. 0 times theorem prover too weak. 257 trivial. 0 not checked. [2023-12-02 16:33:38,123 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:33:50,813 INFO L134 CoverageAnalysis]: Checked inductivity of 6927 backedges. 2 proven. 6670 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2023-12-02 16:33:50,813 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1560595094] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:33:50,814 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [467979294] [2023-12-02 16:33:50,815 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:33:50,815 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:33:50,816 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:33:50,816 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:33:50,816 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:33:50,948 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 16:33:50,971 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:33:51,536 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8655#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:33:51,537 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:33:51,537 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:33:51,537 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [118, 117, 118] total 235 [2023-12-02 16:33:51,537 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35219536] [2023-12-02 16:33:51,537 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:33:51,538 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 235 states [2023-12-02 16:33:51,538 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:33:51,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 235 interpolants. [2023-12-02 16:33:51,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27520, Invalid=31769, Unknown=3, NotChecked=0, Total=59292 [2023-12-02 16:33:51,546 INFO L87 Difference]: Start difference. First operand 185 states and 199 transitions. Second operand has 235 states, 235 states have (on average 1.0638297872340425) internal successors, (250), 235 states have internal predecessors, (250), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:33:52,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:33:52,298 INFO L93 Difference]: Finished difference Result 370 states and 514 transitions. [2023-12-02 16:33:52,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 234 states. [2023-12-02 16:33:52,299 INFO L78 Accepts]: Start accepts. Automaton has has 235 states, 235 states have (on average 1.0638297872340425) internal successors, (250), 235 states have internal predecessors, (250), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 154 [2023-12-02 16:33:52,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:33:52,301 INFO L225 Difference]: With dead ends: 370 [2023-12-02 16:33:52,301 INFO L226 Difference]: Without dead ends: 302 [2023-12-02 16:33:52,305 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 336 SyntacticMatches, 0 SemanticMatches, 242 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3601 ImplicationChecksByTransitivity, 17.3s TimeCoverageRelationStatistics Valid=27520, Invalid=31769, Unknown=3, NotChecked=0, Total=59292 [2023-12-02 16:33:52,305 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:33:52,305 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 136 Invalid, 323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:33:52,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2023-12-02 16:33:52,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 302. [2023-12-02 16:33:52,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 293 states have (on average 1.0375426621160408) internal successors, (304), 295 states have internal predecessors, (304), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:33:52,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 316 transitions. [2023-12-02 16:33:52,333 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 316 transitions. Word has length 154 [2023-12-02 16:33:52,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:33:52,334 INFO L495 AbstractCegarLoop]: Abstraction has 302 states and 316 transitions. [2023-12-02 16:33:52,334 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 235 states, 235 states have (on average 1.0638297872340425) internal successors, (250), 235 states have internal predecessors, (250), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:33:52,334 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 316 transitions. [2023-12-02 16:33:52,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2023-12-02 16:33:52,337 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:33:52,337 INFO L195 NwaCegarLoop]: trace histogram [232, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:33:52,343 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 16:33:52,537 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 16:33:52,537 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:33:52,537 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:33:52,538 INFO L85 PathProgramCache]: Analyzing trace with hash 1329907939, now seen corresponding path program 10 times [2023-12-02 16:33:52,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:33:52,538 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656270316] [2023-12-02 16:33:52,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:33:52,538 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:33:52,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:34:19,658 INFO L134 CoverageAnalysis]: Checked inductivity of 27285 backedges. 2 proven. 27028 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2023-12-02 16:34:19,658 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:34:19,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656270316] [2023-12-02 16:34:19,659 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656270316] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:34:19,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1328507647] [2023-12-02 16:34:19,659 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 16:34:19,659 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:34:19,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:34:19,660 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:34:19,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 16:34:20,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:34:20,197 INFO L262 TraceCheckSpWp]: Trace formula consists of 2259 conjuncts, 234 conjunts are in the unsatisfiable core [2023-12-02 16:34:20,209 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:34:20,474 INFO L134 CoverageAnalysis]: Checked inductivity of 27285 backedges. 0 proven. 27028 refuted. 0 times theorem prover too weak. 257 trivial. 0 not checked. [2023-12-02 16:34:20,475 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:35:11,533 INFO L134 CoverageAnalysis]: Checked inductivity of 27285 backedges. 2 proven. 27028 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2023-12-02 16:35:11,533 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1328507647] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:35:11,533 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1892941080] [2023-12-02 16:35:11,535 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:35:11,535 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:35:11,535 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:35:11,535 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:35:11,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:35:11,657 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 16:35:11,661 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:35:12,713 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12059#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:35:12,713 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:35:12,713 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:35:12,713 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [235, 234, 235] total 469 [2023-12-02 16:35:12,713 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285654728] [2023-12-02 16:35:12,714 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:35:12,715 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 469 states [2023-12-02 16:35:12,715 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:35:12,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 469 interpolants. [2023-12-02 16:35:12,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109771, Invalid=118229, Unknown=6, NotChecked=0, Total=228006 [2023-12-02 16:35:12,750 INFO L87 Difference]: Start difference. First operand 302 states and 316 transitions. Second operand has 469 states, 469 states have (on average 1.0319829424307037) internal successors, (484), 469 states have internal predecessors, (484), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:35:16,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:35:16,619 INFO L93 Difference]: Finished difference Result 604 states and 865 transitions. [2023-12-02 16:35:16,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 468 states. [2023-12-02 16:35:16,620 INFO L78 Accepts]: Start accepts. Automaton has has 469 states, 469 states have (on average 1.0319829424307037) internal successors, (484), 469 states have internal predecessors, (484), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 271 [2023-12-02 16:35:16,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:35:16,623 INFO L225 Difference]: With dead ends: 604 [2023-12-02 16:35:16,623 INFO L226 Difference]: Without dead ends: 536 [2023-12-02 16:35:16,632 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1046 GetRequests, 570 SyntacticMatches, 0 SemanticMatches, 476 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7230 ImplicationChecksByTransitivity, 68.3s TimeCoverageRelationStatistics Valid=109771, Invalid=118229, Unknown=6, NotChecked=0, Total=228006 [2023-12-02 16:35:16,632 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 545 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 545 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:35:16,633 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 119 Invalid, 546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 545 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 16:35:16,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 536 states. [2023-12-02 16:35:16,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 536 to 536. [2023-12-02 16:35:16,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 536 states, 527 states have (on average 1.0208728652751422) internal successors, (538), 529 states have internal predecessors, (538), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:35:16,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 536 states to 536 states and 550 transitions. [2023-12-02 16:35:16,719 INFO L78 Accepts]: Start accepts. Automaton has 536 states and 550 transitions. Word has length 271 [2023-12-02 16:35:16,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:35:16,719 INFO L495 AbstractCegarLoop]: Abstraction has 536 states and 550 transitions. [2023-12-02 16:35:16,720 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 469 states, 469 states have (on average 1.0319829424307037) internal successors, (484), 469 states have internal predecessors, (484), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:35:16,720 INFO L276 IsEmpty]: Start isEmpty. Operand 536 states and 550 transitions. [2023-12-02 16:35:16,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2023-12-02 16:35:16,727 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:35:16,727 INFO L195 NwaCegarLoop]: trace histogram [466, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:35:16,735 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 16:35:16,927 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:35:16,928 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:35:16,928 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:35:16,928 INFO L85 PathProgramCache]: Analyzing trace with hash 2074061635, now seen corresponding path program 11 times [2023-12-02 16:35:16,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:35:16,928 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [555704286] [2023-12-02 16:35:16,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:35:16,928 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:35:17,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:37:11,135 INFO L134 CoverageAnalysis]: Checked inductivity of 109068 backedges. 2 proven. 108811 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2023-12-02 16:37:11,135 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:37:11,135 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [555704286] [2023-12-02 16:37:11,135 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [555704286] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:37:11,135 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105404096] [2023-12-02 16:37:11,135 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:37:11,135 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:37:11,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:37:11,136 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:37:11,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 16:37:13,574 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2023-12-02 16:37:13,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:37:13,581 INFO L262 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 25 conjunts are in the unsatisfiable core [2023-12-02 16:37:13,588 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:37:17,405 INFO L134 CoverageAnalysis]: Checked inductivity of 109068 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 108815 trivial. 0 not checked. [2023-12-02 16:37:17,405 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:37:21,641 INFO L134 CoverageAnalysis]: Checked inductivity of 109068 backedges. 2 proven. 253 refuted. 0 times theorem prover too weak. 108813 trivial. 0 not checked. [2023-12-02 16:37:21,641 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [105404096] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:37:21,641 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1347157176] [2023-12-02 16:37:21,643 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:37:21,643 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:37:21,643 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:37:21,644 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:37:21,644 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:37:21,763 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 16:37:21,766 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:37:23,713 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17851#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:37:23,713 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:37:23,713 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:37:23,713 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [469, 26, 26] total 517 [2023-12-02 16:37:23,714 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621121761] [2023-12-02 16:37:23,714 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:37:23,716 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 517 states [2023-12-02 16:37:23,716 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:37:23,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 517 interpolants. [2023-12-02 16:37:23,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110911, Invalid=165232, Unknown=7, NotChecked=0, Total=276150 [2023-12-02 16:37:23,758 INFO L87 Difference]: Start difference. First operand 536 states and 550 transitions. Second operand has 517 states, 517 states have (on average 1.0328820116054158) internal successors, (534), 517 states have internal predecessors, (534), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:39:08,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:39:08,585 INFO L93 Difference]: Finished difference Result 652 states and 724 transitions. [2023-12-02 16:39:08,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 540 states. [2023-12-02 16:39:08,587 INFO L78 Accepts]: Start accepts. Automaton has has 517 states, 517 states have (on average 1.0328820116054158) internal successors, (534), 517 states have internal predecessors, (534), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 505 [2023-12-02 16:39:08,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:39:08,591 INFO L225 Difference]: With dead ends: 652 [2023-12-02 16:39:08,591 INFO L226 Difference]: Without dead ends: 584 [2023-12-02 16:39:08,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2518 GetRequests, 1458 SyntacticMatches, 0 SemanticMatches, 1060 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183059 ImplicationChecksByTransitivity, 176.9s TimeCoverageRelationStatistics Valid=334571, Invalid=792198, Unknown=13, NotChecked=0, Total=1126782 [2023-12-02 16:39:08,644 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 1073 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 724 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1076 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 729 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 724 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 16:39:08,644 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1076 Valid, 167 Invalid, 729 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 724 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 16:39:08,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 584 states. [2023-12-02 16:39:08,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 584 to 573. [2023-12-02 16:39:08,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 573 states, 564 states have (on average 1.0195035460992907) internal successors, (575), 566 states have internal predecessors, (575), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:39:08,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 573 states to 573 states and 587 transitions. [2023-12-02 16:39:08,693 INFO L78 Accepts]: Start accepts. Automaton has 573 states and 587 transitions. Word has length 505 [2023-12-02 16:39:08,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:39:08,693 INFO L495 AbstractCegarLoop]: Abstraction has 573 states and 587 transitions. [2023-12-02 16:39:08,694 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 517 states, 517 states have (on average 1.0328820116054158) internal successors, (534), 517 states have internal predecessors, (534), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:39:08,694 INFO L276 IsEmpty]: Start isEmpty. Operand 573 states and 587 transitions. [2023-12-02 16:39:08,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 531 [2023-12-02 16:39:08,697 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:39:08,697 INFO L195 NwaCegarLoop]: trace histogram [467, 46, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:39:08,705 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 16:39:08,898 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:39:08,898 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:39:08,898 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:39:08,898 INFO L85 PathProgramCache]: Analyzing trace with hash 1006080618, now seen corresponding path program 12 times [2023-12-02 16:39:08,898 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:39:08,898 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681177916] [2023-12-02 16:39:08,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:39:08,898 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:39:09,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:41:07,603 INFO L134 CoverageAnalysis]: Checked inductivity of 110363 backedges. 2 proven. 109278 refuted. 0 times theorem prover too weak. 1083 trivial. 0 not checked. [2023-12-02 16:41:07,603 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:41:07,603 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681177916] [2023-12-02 16:41:07,603 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [681177916] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:41:07,603 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [269339887] [2023-12-02 16:41:07,604 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:41:07,604 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:41:07,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:41:07,605 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:41:07,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 16:41:08,676 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:41:08,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:41:08,706 INFO L262 TraceCheckSpWp]: Trace formula consists of 4470 conjuncts, 469 conjunts are in the unsatisfiable core [2023-12-02 16:41:08,728 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:41:09,240 INFO L134 CoverageAnalysis]: Checked inductivity of 110363 backedges. 0 proven. 109278 refuted. 0 times theorem prover too weak. 1085 trivial. 0 not checked. [2023-12-02 16:41:09,240 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:44:44,571 INFO L134 CoverageAnalysis]: Checked inductivity of 110363 backedges. 2 proven. 109278 refuted. 0 times theorem prover too weak. 1083 trivial. 0 not checked. [2023-12-02 16:44:44,572 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [269339887] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:44:44,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1773441520] [2023-12-02 16:44:44,573 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 16:44:44,574 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:44:44,574 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:44:44,574 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:44:44,574 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:44:44,711 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 16:44:44,715 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:44:46,701 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25455#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:44:46,701 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:44:46,701 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:44:46,702 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [470, 469, 470] total 939 [2023-12-02 16:44:46,702 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749965199] [2023-12-02 16:44:46,702 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:44:46,704 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 939 states [2023-12-02 16:44:46,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:44:46,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 939 interpolants. [2023-12-02 16:44:46,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=440416, Invalid=457333, Unknown=7, NotChecked=0, Total=897756 [2023-12-02 16:44:46,855 INFO L87 Difference]: Start difference. First operand 573 states and 587 transitions. Second operand has 939 states, 939 states have (on average 1.0159744408945688) internal successors, (954), 939 states have internal predecessors, (954), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:45:12,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:45:12,517 INFO L93 Difference]: Finished difference Result 1146 states and 1642 transitions. [2023-12-02 16:45:12,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 938 states. [2023-12-02 16:45:12,519 INFO L78 Accepts]: Start accepts. Automaton has has 939 states, 939 states have (on average 1.0159744408945688) internal successors, (954), 939 states have internal predecessors, (954), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 530 [2023-12-02 16:45:12,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:45:12,523 INFO L225 Difference]: With dead ends: 1146 [2023-12-02 16:45:12,523 INFO L226 Difference]: Without dead ends: 1042 [2023-12-02 16:45:12,560 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2058 GetRequests, 1112 SyntacticMatches, 0 SemanticMatches, 946 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14513 ImplicationChecksByTransitivity, 284.2s TimeCoverageRelationStatistics Valid=440416, Invalid=457333, Unknown=7, NotChecked=0, Total=897756 [2023-12-02 16:45:12,561 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 1049 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 1050 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1049 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 16:45:12,561 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 170 Invalid, 1050 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1049 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 16:45:12,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1042 states. [2023-12-02 16:45:12,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1042 to 1042. [2023-12-02 16:45:12,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1042 states, 1033 states have (on average 1.010648596321394) internal successors, (1044), 1035 states have internal predecessors, (1044), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:45:12,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1042 states to 1042 states and 1056 transitions. [2023-12-02 16:45:12,646 INFO L78 Accepts]: Start accepts. Automaton has 1042 states and 1056 transitions. Word has length 530 [2023-12-02 16:45:12,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:45:12,647 INFO L495 AbstractCegarLoop]: Abstraction has 1042 states and 1056 transitions. [2023-12-02 16:45:12,648 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 939 states, 939 states have (on average 1.0159744408945688) internal successors, (954), 939 states have internal predecessors, (954), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:45:12,648 INFO L276 IsEmpty]: Start isEmpty. Operand 1042 states and 1056 transitions. [2023-12-02 16:45:12,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1000 [2023-12-02 16:45:12,656 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:45:12,657 INFO L195 NwaCegarLoop]: trace histogram [936, 46, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:45:12,672 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 16:45:12,857 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e2f2d802-afb7-4a90-9dde-788944aef1cf/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:45:12,858 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:45:12,858 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:45:12,859 INFO L85 PathProgramCache]: Analyzing trace with hash -1975723037, now seen corresponding path program 13 times [2023-12-02 16:45:12,859 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:45:12,859 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1228864688] [2023-12-02 16:45:12,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:45:12,859 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:45:17,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat