./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/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_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/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_b4bc0169-b5ce-40be-9df8-eb05b83df050/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 ab50d4c44616d850baf388e04d7eb1063c3cea27d21c9cbb628b158ef2bdff42 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 16:01:37,721 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 16:01:37,790 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 16:01:37,797 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 16:01:37,797 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 16:01:37,826 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 16:01:37,827 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 16:01:37,827 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 16:01:37,828 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 16:01:37,829 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 16:01:37,829 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 16:01:37,830 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 16:01:37,831 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 16:01:37,831 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 16:01:37,832 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 16:01:37,832 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 16:01:37,833 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 16:01:37,833 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 16:01:37,834 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 16:01:37,834 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 16:01:37,835 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 16:01:37,836 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 16:01:37,837 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 16:01:37,837 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 16:01:37,838 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 16:01:37,838 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 16:01:37,838 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 16:01:37,839 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 16:01:37,839 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 16:01:37,840 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 16:01:37,840 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 16:01:37,840 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 16:01:37,841 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 16:01:37,841 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 16:01:37,841 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 16:01:37,842 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 16:01:37,842 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 16:01:37,842 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:01:37,842 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 16:01:37,843 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 16:01:37,843 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 16:01:37,843 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 16:01:37,843 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 16:01:37,844 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 16:01:37,844 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 16:01:37,844 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 16:01:37,844 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 16:01:37,844 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_b4bc0169-b5ce-40be-9df8-eb05b83df050/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ab50d4c44616d850baf388e04d7eb1063c3cea27d21c9cbb628b158ef2bdff42 [2023-12-02 16:01:38,083 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 16:01:38,105 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 16:01:38,108 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 16:01:38,109 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 16:01:38,110 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 16:01:38,111 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c [2023-12-02 16:01:40,974 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 16:01:41,147 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 16:01:41,148 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c [2023-12-02 16:01:41,157 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/data/2c458de11/fb23c04ef0a04c069bf328409c1ba8d3/FLAGe14317e55 [2023-12-02 16:01:41,173 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/data/2c458de11/fb23c04ef0a04c069bf328409c1ba8d3 [2023-12-02 16:01:41,176 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 16:01:41,177 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 16:01:41,179 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 16:01:41,179 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 16:01:41,191 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 16:01:41,192 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:01:41" (1/1) ... [2023-12-02 16:01:41,193 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1abb85ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:01:41, skipping insertion in model container [2023-12-02 16:01:41,193 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:01:41" (1/1) ... [2023-12-02 16:01:41,219 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 16:01:41,377 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_b4bc0169-b5ce-40be-9df8-eb05b83df050/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c[490,503] [2023-12-02 16:01:41,401 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:01:41,413 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 16:01:41,426 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_b4bc0169-b5ce-40be-9df8-eb05b83df050/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound5.c[490,503] [2023-12-02 16:01:41,436 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:01:41,451 INFO L206 MainTranslator]: Completed translation [2023-12-02 16:01:41,452 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:01:41 WrapperNode [2023-12-02 16:01:41,452 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 16:01:41,453 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 16:01:41,454 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 16:01:41,454 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 16:01:41,462 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:01:41" (1/1) ... [2023-12-02 16:01:41,470 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:01:41" (1/1) ... [2023-12-02 16:01:41,490 INFO L138 Inliner]: procedures = 14, calls = 19, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 79 [2023-12-02 16:01:41,490 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 16:01:41,491 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 16:01:41,491 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 16:01:41,491 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 16:01:41,501 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:01:41" (1/1) ... [2023-12-02 16:01:41,501 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:01:41" (1/1) ... [2023-12-02 16:01:41,503 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:01:41" (1/1) ... [2023-12-02 16:01:41,503 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:01:41" (1/1) ... [2023-12-02 16:01:41,507 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:01:41" (1/1) ... [2023-12-02 16:01:41,511 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:01:41" (1/1) ... [2023-12-02 16:01:41,512 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:01:41" (1/1) ... [2023-12-02 16:01:41,513 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:01:41" (1/1) ... [2023-12-02 16:01:41,515 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 16:01:41,516 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 16:01:41,516 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 16:01:41,516 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 16:01:41,517 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:01:41" (1/1) ... [2023-12-02 16:01:41,523 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:01:41,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:01:41,548 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 16:01:41,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 16:01:41,578 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 16:01:41,578 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-12-02 16:01:41,578 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-12-02 16:01:41,578 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 16:01:41,578 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 16:01:41,578 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 16:01:41,579 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-12-02 16:01:41,579 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-12-02 16:01:41,640 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 16:01:41,642 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 16:01:41,792 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 16:01:41,827 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 16:01:41,827 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-12-02 16:01:41,829 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:01:41 BoogieIcfgContainer [2023-12-02 16:01:41,829 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 16:01:41,831 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 16:01:41,831 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 16:01:41,835 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 16:01:41,835 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 04:01:41" (1/3) ... [2023-12-02 16:01:41,836 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40d939d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:01:41, skipping insertion in model container [2023-12-02 16:01:41,836 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:01:41" (2/3) ... [2023-12-02 16:01:41,836 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40d939d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:01:41, skipping insertion in model container [2023-12-02 16:01:41,836 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:01:41" (3/3) ... [2023-12-02 16:01:41,838 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd2-ll_valuebound5.c [2023-12-02 16:01:41,857 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 16:01:41,857 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 16:01:41,904 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 16:01:41,911 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;@caeb45a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 16:01:41,911 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 16:01:41,916 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-12-02 16:01:41,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-12-02 16:01:41,924 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:01:41,925 INFO L195 NwaCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:01:41,925 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:01:41,930 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:01:41,931 INFO L85 PathProgramCache]: Analyzing trace with hash 966807424, now seen corresponding path program 1 times [2023-12-02 16:01:41,940 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:01:41,941 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1228154805] [2023-12-02 16:01:41,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:01:41,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:01:42,049 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:01:42,050 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1760035383] [2023-12-02 16:01:42,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:01:42,050 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:01:42,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:01:42,066 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:01:42,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 16:01:42,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:01:42,168 INFO L262 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 1 conjunts are in the unsatisfiable core [2023-12-02 16:01:42,173 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:01:42,200 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-12-02 16:01:42,201 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:01:42,201 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:01:42,201 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1228154805] [2023-12-02 16:01:42,201 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:01:42,202 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1760035383] [2023-12-02 16:01:42,202 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1760035383] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:01:42,203 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:01:42,203 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 16:01:42,205 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962146724] [2023-12-02 16:01:42,206 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:01:42,210 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-12-02 16:01:42,211 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:01:42,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-12-02 16:01:42,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-12-02 16:01:42,239 INFO L87 Difference]: Start difference. First operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-12-02 16:01:42,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:01:42,270 INFO L93 Difference]: Finished difference Result 49 states and 78 transitions. [2023-12-02 16:01:42,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-12-02 16:01:42,273 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 26 [2023-12-02 16:01:42,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:01:42,279 INFO L225 Difference]: With dead ends: 49 [2023-12-02 16:01:42,279 INFO L226 Difference]: Without dead ends: 28 [2023-12-02 16:01:42,283 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-12-02 16:01:42,286 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:01:42,287 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:01:42,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-12-02 16:01:42,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-12-02 16:01:42,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 15 states have internal predecessors, (16), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-12-02 16:01:42,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2023-12-02 16:01:42,321 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 26 [2023-12-02 16:01:42,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:01:42,322 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2023-12-02 16:01:42,322 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-12-02 16:01:42,322 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2023-12-02 16:01:42,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-12-02 16:01:42,324 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:01:42,324 INFO L195 NwaCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:01:42,332 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 16:01:42,527 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:01:42,528 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:01:42,529 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:01:42,529 INFO L85 PathProgramCache]: Analyzing trace with hash 1643993843, now seen corresponding path program 1 times [2023-12-02 16:01:42,529 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:01:42,529 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775183818] [2023-12-02 16:01:42,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:01:42,530 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:01:42,548 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:01:42,548 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [819505423] [2023-12-02 16:01:42,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:01:42,549 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:01:42,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:01:42,550 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:01:42,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 16:01:42,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:01:42,619 INFO L262 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 16:01:42,622 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:01:42,690 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 16:01:42,690 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:01:42,766 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 16:01:42,766 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:01:42,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [775183818] [2023-12-02 16:01:42,767 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:01:42,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819505423] [2023-12-02 16:01:42,767 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [819505423] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:01:42,768 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1428218550] [2023-12-02 16:01:42,787 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-12-02 16:01:42,787 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:01:42,791 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:01:42,795 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:01:42,795 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:01:44,074 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 16:01:44,075 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:01:44,741 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1428218550] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:01:44,741 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:01:44,741 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [5, 5] total 14 [2023-12-02 16:01:44,742 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215351219] [2023-12-02 16:01:44,742 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:01:44,743 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-12-02 16:01:44,743 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:01:44,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-12-02 16:01:44,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2023-12-02 16:01:44,744 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2023-12-02 16:01:44,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:01:44,936 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2023-12-02 16:01:44,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 16:01:44,937 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 27 [2023-12-02 16:01:44,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:01:44,938 INFO L225 Difference]: With dead ends: 38 [2023-12-02 16:01:44,938 INFO L226 Difference]: Without dead ends: 30 [2023-12-02 16:01:44,939 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 62 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2023-12-02 16:01:44,940 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 21 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:01:44,941 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 48 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:01:44,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-12-02 16:01:44,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2023-12-02 16:01:44,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-12-02 16:01:44,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2023-12-02 16:01:44,956 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 27 [2023-12-02 16:01:44,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:01:44,957 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2023-12-02 16:01:44,957 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2023-12-02 16:01:44,957 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2023-12-02 16:01:44,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-12-02 16:01:44,958 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:01:44,958 INFO L195 NwaCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:01:44,964 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 16:01:45,164 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:01:45,165 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:01:45,165 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:01:45,165 INFO L85 PathProgramCache]: Analyzing trace with hash -575116102, now seen corresponding path program 1 times [2023-12-02 16:01:45,165 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:01:45,166 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897561786] [2023-12-02 16:01:45,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:01:45,166 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:01:45,185 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:01:45,185 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [456943052] [2023-12-02 16:01:45,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:01:45,186 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:01:45,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:01:45,188 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:01:45,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 16:01:45,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:01:45,242 INFO L262 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 16:01:45,245 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:01:45,314 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 16:01:45,314 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:01:45,387 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-12-02 16:01:45,388 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:01:45,388 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897561786] [2023-12-02 16:01:45,388 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:01:45,388 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [456943052] [2023-12-02 16:01:45,388 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [456943052] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 16:01:45,388 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:01:45,389 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 11 [2023-12-02 16:01:45,389 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037170513] [2023-12-02 16:01:45,389 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:01:45,389 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 16:01:45,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:01:45,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 16:01:45,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-12-02 16:01:45,391 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-12-02 16:01:45,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:01:45,455 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2023-12-02 16:01:45,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 16:01:45,456 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), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 28 [2023-12-02 16:01:45,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:01:45,457 INFO L225 Difference]: With dead ends: 36 [2023-12-02 16:01:45,457 INFO L226 Difference]: Without dead ends: 34 [2023-12-02 16:01:45,458 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2023-12-02 16:01:45,459 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 7 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:01:45,460 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 110 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:01:45,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-12-02 16:01:45,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2023-12-02 16:01:45,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 12 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-12-02 16:01:45,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2023-12-02 16:01:45,476 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 28 [2023-12-02 16:01:45,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:01:45,477 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2023-12-02 16:01:45,477 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), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-12-02 16:01:45,477 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2023-12-02 16:01:45,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-12-02 16:01:45,478 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:01:45,478 INFO L195 NwaCegarLoop]: trace histogram [6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:01:45,483 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 16:01:45,679 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-12-02 16:01:45,679 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:01:45,680 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:01:45,680 INFO L85 PathProgramCache]: Analyzing trace with hash -1810277145, now seen corresponding path program 1 times [2023-12-02 16:01:45,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:01:45,680 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078243118] [2023-12-02 16:01:45,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:01:45,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:01:45,698 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:01:45,698 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2011876581] [2023-12-02 16:01:45,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:01:45,699 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:01:45,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:01:45,700 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:01:45,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 16:01:45,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:01:45,769 INFO L262 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 25 conjunts are in the unsatisfiable core [2023-12-02 16:01:45,772 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:01:46,011 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 16:01:46,011 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:01:46,131 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-12-02 16:01:46,131 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:01:46,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078243118] [2023-12-02 16:01:46,132 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:01:46,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2011876581] [2023-12-02 16:01:46,132 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2011876581] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 16:01:46,132 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:01:46,132 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [11] total 14 [2023-12-02 16:01:46,133 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564123974] [2023-12-02 16:01:46,133 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:01:46,133 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:01:46,133 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:01:46,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:01:46,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2023-12-02 16:01:46,135 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2023-12-02 16:01:46,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:01:46,211 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2023-12-02 16:01:46,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 16:01:46,212 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 33 [2023-12-02 16:01:46,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:01:46,213 INFO L225 Difference]: With dead ends: 47 [2023-12-02 16:01:46,213 INFO L226 Difference]: Without dead ends: 45 [2023-12-02 16:01:46,213 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2023-12-02 16:01:46,214 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 7 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:01:46,215 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 151 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:01:46,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-12-02 16:01:46,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2023-12-02 16:01:46,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 16 states have call successors, (16), 4 states have call predecessors, (16), 4 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2023-12-02 16:01:46,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 58 transitions. [2023-12-02 16:01:46,232 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 58 transitions. Word has length 33 [2023-12-02 16:01:46,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:01:46,233 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 58 transitions. [2023-12-02 16:01:46,233 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2023-12-02 16:01:46,233 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 58 transitions. [2023-12-02 16:01:46,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-12-02 16:01:46,235 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:01:46,235 INFO L195 NwaCegarLoop]: trace histogram [6, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:01:46,240 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 16:01:46,437 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:01:46,437 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:01:46,437 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:01:46,438 INFO L85 PathProgramCache]: Analyzing trace with hash -1313498982, now seen corresponding path program 1 times [2023-12-02 16:01:46,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:01:46,438 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [261041883] [2023-12-02 16:01:46,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:01:46,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:01:46,449 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:01:46,450 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [745536678] [2023-12-02 16:01:46,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:01:46,450 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:01:46,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:01:46,451 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:01:46,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 16:01:46,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:01:46,506 INFO L262 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 16:01:46,509 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:01:46,592 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-12-02 16:01:46,592 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:01:46,637 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:01:46,638 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [261041883] [2023-12-02 16:01:46,638 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:01:46,638 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [745536678] [2023-12-02 16:01:46,638 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [745536678] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:01:46,638 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2062918526] [2023-12-02 16:01:46,640 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-12-02 16:01:46,641 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:01:46,641 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:01:46,641 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:01:46,642 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:01:47,556 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 16:01:47,560 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 16:01:47,561 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:01:48,468 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [2062918526] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:01:48,469 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:01:48,469 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [7] total 19 [2023-12-02 16:01:48,469 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147546113] [2023-12-02 16:01:48,469 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:01:48,469 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 16:01:48,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:01:48,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 16:01:48,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=328, Unknown=0, NotChecked=0, Total=420 [2023-12-02 16:01:48,471 INFO L87 Difference]: Start difference. First operand 44 states and 58 transitions. Second operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2023-12-02 16:01:48,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:01:48,708 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2023-12-02 16:01:48,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 16:01:48,709 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 38 [2023-12-02 16:01:48,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:01:48,710 INFO L225 Difference]: With dead ends: 65 [2023-12-02 16:01:48,710 INFO L226 Difference]: Without dead ends: 63 [2023-12-02 16:01:48,711 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 56 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=92, Invalid=328, Unknown=0, NotChecked=0, Total=420 [2023-12-02 16:01:48,712 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 45 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:01:48,712 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 44 Invalid, 176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:01:48,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-12-02 16:01:48,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2023-12-02 16:01:48,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 33 states have (on average 1.121212121212121) internal successors, (37), 35 states have internal predecessors, (37), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2023-12-02 16:01:48,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2023-12-02 16:01:48,729 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 38 [2023-12-02 16:01:48,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:01:48,730 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2023-12-02 16:01:48,730 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2023-12-02 16:01:48,731 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2023-12-02 16:01:48,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-12-02 16:01:48,732 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:01:48,732 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:01:48,738 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-12-02 16:01:48,938 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:01:48,938 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:01:48,939 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:01:48,939 INFO L85 PathProgramCache]: Analyzing trace with hash 434944611, now seen corresponding path program 1 times [2023-12-02 16:01:48,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:01:48,939 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1341995255] [2023-12-02 16:01:48,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:01:48,939 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:01:48,953 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:01:48,954 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [329767028] [2023-12-02 16:01:48,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:01:48,954 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:01:48,954 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:01:48,955 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:01:48,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 16:01:49,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:01:49,015 INFO L262 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:01:49,018 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:01:49,063 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-12-02 16:01:49,063 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:01:49,145 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-12-02 16:01:49,145 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:01:49,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1341995255] [2023-12-02 16:01:49,146 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:01:49,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [329767028] [2023-12-02 16:01:49,146 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [329767028] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:01:49,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [49839326] [2023-12-02 16:01:49,150 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 16:01:49,150 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:01:49,151 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:01:49,151 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:01:49,151 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:01:52,986 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 16:01:52,990 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 16:01:52,991 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:01:55,423 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1781#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:01:55,423 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:01:55,423 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:01:55,423 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2023-12-02 16:01:55,423 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064167496] [2023-12-02 16:01:55,424 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:01:55,424 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 16:01:55,424 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:01:55,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 16:01:55,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=375, Unknown=0, NotChecked=0, Total=506 [2023-12-02 16:01:55,425 INFO L87 Difference]: Start difference. First operand 61 states and 76 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2023-12-02 16:01:55,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:01:55,599 INFO L93 Difference]: Finished difference Result 103 states and 142 transitions. [2023-12-02 16:01:55,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 16:01:55,600 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 52 [2023-12-02 16:01:55,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:01:55,601 INFO L225 Difference]: With dead ends: 103 [2023-12-02 16:01:55,601 INFO L226 Difference]: Without dead ends: 95 [2023-12-02 16:01:55,602 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 124 SyntacticMatches, 9 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=172, Invalid=530, Unknown=0, NotChecked=0, Total=702 [2023-12-02 16:01:55,603 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 34 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:01:55,604 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 203 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:01:55,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2023-12-02 16:01:55,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 86. [2023-12-02 16:01:55,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 46 states have (on average 1.1956521739130435) internal successors, (55), 47 states have internal predecessors, (55), 32 states have call successors, (32), 7 states have call predecessors, (32), 7 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2023-12-02 16:01:55,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 118 transitions. [2023-12-02 16:01:55,633 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 118 transitions. Word has length 52 [2023-12-02 16:01:55,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:01:55,634 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 118 transitions. [2023-12-02 16:01:55,634 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2023-12-02 16:01:55,634 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 118 transitions. [2023-12-02 16:01:55,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-12-02 16:01:55,635 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:01:55,636 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:01:55,640 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 16:01:55,836 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-12-02 16:01:55,836 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:01:55,837 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:01:55,837 INFO L85 PathProgramCache]: Analyzing trace with hash -243308457, now seen corresponding path program 1 times [2023-12-02 16:01:55,838 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:01:55,838 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197453537] [2023-12-02 16:01:55,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:01:55,838 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:01:55,853 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:01:55,853 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1967501933] [2023-12-02 16:01:55,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:01:55,853 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:01:55,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:01:55,855 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:01:55,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 16:01:55,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:01:55,921 INFO L262 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 16:01:55,924 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:01:55,983 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 5 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-12-02 16:01:55,983 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:01:56,067 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-12-02 16:01:56,067 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:01:56,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197453537] [2023-12-02 16:01:56,068 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:01:56,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1967501933] [2023-12-02 16:01:56,068 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1967501933] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:01:56,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [684973594] [2023-12-02 16:01:56,071 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 16:01:56,071 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:01:56,071 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:01:56,072 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:01:56,072 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:01:59,658 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 16:01:59,662 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 16:01:59,662 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:02:03,042 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2454#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:02:03,042 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:02:03,043 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:02:03,043 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2023-12-02 16:02:03,043 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047373468] [2023-12-02 16:02:03,043 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:02:03,043 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-12-02 16:02:03,043 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:02:03,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-12-02 16:02:03,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=511, Unknown=0, NotChecked=0, Total=650 [2023-12-02 16:02:03,044 INFO L87 Difference]: Start difference. First operand 86 states and 118 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 3 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2023-12-02 16:02:03,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:02:03,236 INFO L93 Difference]: Finished difference Result 100 states and 133 transitions. [2023-12-02 16:02:03,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 16:02:03,237 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 3 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 58 [2023-12-02 16:02:03,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:02:03,240 INFO L225 Difference]: With dead ends: 100 [2023-12-02 16:02:03,240 INFO L226 Difference]: Without dead ends: 97 [2023-12-02 16:02:03,241 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 143 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=164, Invalid=648, Unknown=0, NotChecked=0, Total=812 [2023-12-02 16:02:03,242 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 20 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:02:03,243 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 130 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:02:03,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2023-12-02 16:02:03,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2023-12-02 16:02:03,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 53 states have (on average 1.169811320754717) internal successors, (62), 55 states have internal predecessors, (62), 34 states have call successors, (34), 9 states have call predecessors, (34), 9 states have return successors, (33), 32 states have call predecessors, (33), 33 states have call successors, (33) [2023-12-02 16:02:03,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 129 transitions. [2023-12-02 16:02:03,281 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 129 transitions. Word has length 58 [2023-12-02 16:02:03,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:02:03,281 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 129 transitions. [2023-12-02 16:02:03,282 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 3 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2023-12-02 16:02:03,282 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 129 transitions. [2023-12-02 16:02:03,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-12-02 16:02:03,283 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:02:03,283 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:02:03,287 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 16:02:03,483 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-12-02 16:02:03,483 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:02:03,484 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:02:03,484 INFO L85 PathProgramCache]: Analyzing trace with hash 1216164650, now seen corresponding path program 2 times [2023-12-02 16:02:03,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:02:03,484 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878295065] [2023-12-02 16:02:03,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:02:03,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:02:03,498 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:02:03,498 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1693921138] [2023-12-02 16:02:03,499 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:02:03,499 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:02:03,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:02:03,500 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:02:03,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 16:02:03,566 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 16:02:03,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:02:03,568 INFO L262 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 36 conjunts are in the unsatisfiable core [2023-12-02 16:02:03,570 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:02:03,916 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2023-12-02 16:02:03,916 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:02:04,108 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:02:04,108 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878295065] [2023-12-02 16:02:04,108 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:02:04,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1693921138] [2023-12-02 16:02:04,109 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1693921138] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:02:04,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [513746153] [2023-12-02 16:02:04,111 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 16:02:04,112 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:02:04,112 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:02:04,112 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:02:04,112 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:02:07,743 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 16:02:07,746 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 16:02:07,747 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:02:11,351 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3044#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:02:11,352 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:02:11,352 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:02:11,352 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2023-12-02 16:02:11,352 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190955059] [2023-12-02 16:02:11,352 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 16:02:11,352 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-12-02 16:02:11,352 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:02:11,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-12-02 16:02:11,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=764, Unknown=0, NotChecked=0, Total=930 [2023-12-02 16:02:11,354 INFO L87 Difference]: Start difference. First operand 97 states and 129 transitions. Second operand has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) [2023-12-02 16:02:11,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:02:11,603 INFO L93 Difference]: Finished difference Result 125 states and 165 transitions. [2023-12-02 16:02:11,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 16:02:11,604 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) Word has length 63 [2023-12-02 16:02:11,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:02:11,606 INFO L225 Difference]: With dead ends: 125 [2023-12-02 16:02:11,606 INFO L226 Difference]: Without dead ends: 123 [2023-12-02 16:02:11,606 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 109 SyntacticMatches, 7 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=190, Invalid=932, Unknown=0, NotChecked=0, Total=1122 [2023-12-02 16:02:11,607 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 30 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:02:11,607 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 132 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:02:11,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2023-12-02 16:02:11,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 120. [2023-12-02 16:02:11,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 66 states have (on average 1.1666666666666667) internal successors, (77), 68 states have internal predecessors, (77), 42 states have call successors, (42), 11 states have call predecessors, (42), 11 states have return successors, (41), 40 states have call predecessors, (41), 41 states have call successors, (41) [2023-12-02 16:02:11,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 160 transitions. [2023-12-02 16:02:11,639 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 160 transitions. Word has length 63 [2023-12-02 16:02:11,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:02:11,640 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 160 transitions. [2023-12-02 16:02:11,640 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) [2023-12-02 16:02:11,640 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 160 transitions. [2023-12-02 16:02:11,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2023-12-02 16:02:11,641 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:02:11,641 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:02:11,646 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 16:02:11,842 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-12-02 16:02:11,842 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:02:11,843 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:02:11,843 INFO L85 PathProgramCache]: Analyzing trace with hash 1984692712, now seen corresponding path program 1 times [2023-12-02 16:02:11,843 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:02:11,843 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170017894] [2023-12-02 16:02:11,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:02:11,843 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:02:11,856 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:02:11,856 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [55938255] [2023-12-02 16:02:11,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:02:11,856 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:02:11,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:02:11,857 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:02:11,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 16:02:11,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:02:11,922 INFO L262 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 11 conjunts are in the unsatisfiable core [2023-12-02 16:02:11,925 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:02:12,001 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2023-12-02 16:02:12,001 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:02:12,087 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2023-12-02 16:02:12,087 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:02:12,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170017894] [2023-12-02 16:02:12,087 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:02:12,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55938255] [2023-12-02 16:02:12,087 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [55938255] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:02:12,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [664472842] [2023-12-02 16:02:12,090 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 16:02:12,090 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:02:12,091 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:02:12,091 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:02:12,091 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:02:14,022 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 16:02:14,025 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 16:02:14,026 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:02:15,838 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3838#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:02:15,838 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:02:15,838 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:02:15,839 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2023-12-02 16:02:15,839 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476461528] [2023-12-02 16:02:15,839 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:02:15,839 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 16:02:15,839 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:02:15,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 16:02:15,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=579, Unknown=0, NotChecked=0, Total=702 [2023-12-02 16:02:15,840 INFO L87 Difference]: Start difference. First operand 120 states and 160 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2023-12-02 16:02:16,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:02:16,087 INFO L93 Difference]: Finished difference Result 127 states and 167 transitions. [2023-12-02 16:02:16,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 16:02:16,087 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) Word has length 65 [2023-12-02 16:02:16,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:02:16,089 INFO L225 Difference]: With dead ends: 127 [2023-12-02 16:02:16,089 INFO L226 Difference]: Without dead ends: 125 [2023-12-02 16:02:16,090 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 165 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=139, Invalid=673, Unknown=0, NotChecked=0, Total=812 [2023-12-02 16:02:16,091 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 13 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:02:16,091 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 108 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:02:16,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2023-12-02 16:02:16,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2023-12-02 16:02:16,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 69 states have (on average 1.1594202898550725) internal successors, (80), 71 states have internal predecessors, (80), 43 states have call successors, (43), 12 states have call predecessors, (43), 12 states have return successors, (42), 41 states have call predecessors, (42), 42 states have call successors, (42) [2023-12-02 16:02:16,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 165 transitions. [2023-12-02 16:02:16,134 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 165 transitions. Word has length 65 [2023-12-02 16:02:16,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:02:16,134 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 165 transitions. [2023-12-02 16:02:16,135 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2023-12-02 16:02:16,135 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 165 transitions. [2023-12-02 16:02:16,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2023-12-02 16:02:16,136 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:02:16,136 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:02:16,140 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 16:02:16,337 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:02:16,337 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:02:16,337 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:02:16,337 INFO L85 PathProgramCache]: Analyzing trace with hash -491172873, now seen corresponding path program 3 times [2023-12-02 16:02:16,338 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:02:16,338 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950987307] [2023-12-02 16:02:16,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:02:16,338 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:02:16,350 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:02:16,350 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1863294728] [2023-12-02 16:02:16,350 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:02:16,351 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:02:16,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:02:16,352 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:02:16,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 16:02:16,418 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:02:16,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:02:16,420 INFO L262 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 47 conjunts are in the unsatisfiable core [2023-12-02 16:02:16,423 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:02:21,003 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 43 proven. 13 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2023-12-02 16:02:21,003 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:02:21,958 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 31 proven. 8 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2023-12-02 16:02:21,958 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:02:21,959 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950987307] [2023-12-02 16:02:21,959 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:02:21,959 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1863294728] [2023-12-02 16:02:21,959 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1863294728] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:02:21,959 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [988406672] [2023-12-02 16:02:21,962 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 16:02:21,962 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:02:21,962 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:02:21,963 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:02:21,963 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:02:25,400 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 16:02:25,404 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 16:02:25,405 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:02:30,184 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4669#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:02:30,184 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:02:30,184 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:02:30,185 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 17 [2023-12-02 16:02:30,185 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907037074] [2023-12-02 16:02:30,185 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:02:30,185 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 16:02:30,185 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:02:30,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 16:02:30,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=872, Unknown=0, NotChecked=0, Total=1056 [2023-12-02 16:02:30,187 INFO L87 Difference]: Start difference. First operand 125 states and 165 transitions. Second operand has 17 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 14 states have internal predecessors, (35), 9 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (25), 9 states have call predecessors, (25), 8 states have call successors, (25) [2023-12-02 16:02:39,458 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 16:02:39,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:02:39,791 INFO L93 Difference]: Finished difference Result 159 states and 209 transitions. [2023-12-02 16:02:39,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-12-02 16:02:39,791 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 14 states have internal predecessors, (35), 9 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (25), 9 states have call predecessors, (25), 8 states have call successors, (25) Word has length 68 [2023-12-02 16:02:39,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:02:39,793 INFO L225 Difference]: With dead ends: 159 [2023-12-02 16:02:39,793 INFO L226 Difference]: Without dead ends: 157 [2023-12-02 16:02:39,794 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 163 SyntacticMatches, 8 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=325, Invalid=1567, Unknown=0, NotChecked=0, Total=1892 [2023-12-02 16:02:39,794 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 97 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 270 mSolverCounterSat, 100 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 371 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 270 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:02:39,795 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [97 Valid, 176 Invalid, 371 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 270 Invalid, 1 Unknown, 0 Unchecked, 4.3s Time] [2023-12-02 16:02:39,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2023-12-02 16:02:39,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 150. [2023-12-02 16:02:39,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 84 states have (on average 1.1666666666666667) internal successors, (98), 87 states have internal predecessors, (98), 51 states have call successors, (51), 14 states have call predecessors, (51), 14 states have return successors, (50), 48 states have call predecessors, (50), 50 states have call successors, (50) [2023-12-02 16:02:39,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 199 transitions. [2023-12-02 16:02:39,865 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 199 transitions. Word has length 68 [2023-12-02 16:02:39,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:02:39,865 INFO L495 AbstractCegarLoop]: Abstraction has 150 states and 199 transitions. [2023-12-02 16:02:39,865 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 14 states have internal predecessors, (35), 9 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (25), 9 states have call predecessors, (25), 8 states have call successors, (25) [2023-12-02 16:02:39,865 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 199 transitions. [2023-12-02 16:02:39,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2023-12-02 16:02:39,866 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:02:39,866 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:02:39,872 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 16:02:40,067 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:02:40,067 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:02:40,067 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:02:40,067 INFO L85 PathProgramCache]: Analyzing trace with hash -2003369438, now seen corresponding path program 1 times [2023-12-02 16:02:40,068 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:02:40,068 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782549649] [2023-12-02 16:02:40,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:02:40,068 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:02:40,076 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:02:40,076 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1487015720] [2023-12-02 16:02:40,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:02:40,076 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:02:40,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:02:40,077 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:02:40,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 16:02:40,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:02:40,145 INFO L262 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 46 conjunts are in the unsatisfiable core [2023-12-02 16:02:40,147 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:02:40,769 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 18 proven. 14 refuted. 0 times theorem prover too weak. 134 trivial. 0 not checked. [2023-12-02 16:02:40,769 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:02:41,522 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2023-12-02 16:02:41,522 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:02:41,522 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782549649] [2023-12-02 16:02:41,522 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:02:41,522 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1487015720] [2023-12-02 16:02:41,522 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1487015720] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:02:41,522 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1712620623] [2023-12-02 16:02:41,525 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 16:02:41,525 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:02:41,525 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:02:41,525 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:02:41,525 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:02:42,762 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2023-12-02 16:02:42,779 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 16:02:42,780 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:02:45,377 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5645#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:02:45,377 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:02:45,377 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:02:45,377 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 21 [2023-12-02 16:02:45,377 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461201779] [2023-12-02 16:02:45,377 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:02:45,377 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-12-02 16:02:45,378 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:02:45,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-12-02 16:02:45,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=1084, Unknown=0, NotChecked=0, Total=1260 [2023-12-02 16:02:45,379 INFO L87 Difference]: Start difference. First operand 150 states and 199 transitions. Second operand has 21 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 11 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (27), 9 states have call predecessors, (27), 9 states have call successors, (27) [2023-12-02 16:02:53,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:02:53,791 INFO L93 Difference]: Finished difference Result 239 states and 335 transitions. [2023-12-02 16:02:53,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-12-02 16:02:53,792 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 11 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (27), 9 states have call predecessors, (27), 9 states have call successors, (27) Word has length 74 [2023-12-02 16:02:53,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:02:53,796 INFO L225 Difference]: With dead ends: 239 [2023-12-02 16:02:53,796 INFO L226 Difference]: Without dead ends: 235 [2023-12-02 16:02:53,798 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 181 SyntacticMatches, 5 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 873 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=453, Invalid=2627, Unknown=0, NotChecked=0, Total=3080 [2023-12-02 16:02:53,799 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 113 mSDsluCounter, 325 mSDsCounter, 0 mSdLazyCounter, 428 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 367 SdHoareTripleChecker+Invalid, 563 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 428 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2023-12-02 16:02:53,799 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [117 Valid, 367 Invalid, 563 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 428 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2023-12-02 16:02:53,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2023-12-02 16:02:53,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 231. [2023-12-02 16:02:53,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 126 states have (on average 1.1825396825396826) internal successors, (149), 129 states have internal predecessors, (149), 87 states have call successors, (87), 17 states have call predecessors, (87), 17 states have return successors, (86), 84 states have call predecessors, (86), 86 states have call successors, (86) [2023-12-02 16:02:53,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 322 transitions. [2023-12-02 16:02:53,940 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 322 transitions. Word has length 74 [2023-12-02 16:02:53,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:02:53,941 INFO L495 AbstractCegarLoop]: Abstraction has 231 states and 322 transitions. [2023-12-02 16:02:53,941 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 11 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (27), 9 states have call predecessors, (27), 9 states have call successors, (27) [2023-12-02 16:02:53,941 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 322 transitions. [2023-12-02 16:02:53,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-12-02 16:02:53,943 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:02:53,943 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 6, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:02:53,949 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 16:02:54,145 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-12-02 16:02:54,146 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:02:54,146 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:02:54,146 INFO L85 PathProgramCache]: Analyzing trace with hash -707421542, now seen corresponding path program 4 times [2023-12-02 16:02:54,146 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:02:54,146 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332355518] [2023-12-02 16:02:54,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:02:54,146 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:02:54,156 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:02:54,156 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1012432780] [2023-12-02 16:02:54,156 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 16:02:54,156 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:02:54,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:02:54,157 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:02:54,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 16:02:54,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:02:54,218 INFO L262 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 16:02:54,220 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:02:54,242 INFO L134 CoverageAnalysis]: Checked inductivity of 251 backedges. 101 proven. 0 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2023-12-02 16:02:54,242 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:02:54,242 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:02:54,242 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1332355518] [2023-12-02 16:02:54,242 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:02:54,242 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012432780] [2023-12-02 16:02:54,242 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012432780] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:02:54,242 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:02:54,242 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 16:02:54,243 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2039787189] [2023-12-02 16:02:54,243 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:02:54,243 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 16:02:54,243 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:02:54,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 16:02:54,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 16:02:54,244 INFO L87 Difference]: Start difference. First operand 231 states and 322 transitions. Second operand has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2023-12-02 16:02:54,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:02:54,421 INFO L93 Difference]: Finished difference Result 287 states and 395 transitions. [2023-12-02 16:02:54,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 16:02:54,421 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 88 [2023-12-02 16:02:54,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:02:54,423 INFO L225 Difference]: With dead ends: 287 [2023-12-02 16:02:54,423 INFO L226 Difference]: Without dead ends: 199 [2023-12-02 16:02:54,425 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:02:54,425 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 7 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:02:54,425 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 146 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:02:54,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2023-12-02 16:02:54,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 187. [2023-12-02 16:02:54,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 102 states have (on average 1.1372549019607843) internal successors, (116), 104 states have internal predecessors, (116), 67 states have call successors, (67), 17 states have call predecessors, (67), 17 states have return successors, (66), 65 states have call predecessors, (66), 66 states have call successors, (66) [2023-12-02 16:02:54,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 249 transitions. [2023-12-02 16:02:54,527 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 249 transitions. Word has length 88 [2023-12-02 16:02:54,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:02:54,528 INFO L495 AbstractCegarLoop]: Abstraction has 187 states and 249 transitions. [2023-12-02 16:02:54,528 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2023-12-02 16:02:54,528 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 249 transitions. [2023-12-02 16:02:54,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2023-12-02 16:02:54,529 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:02:54,529 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:02:54,533 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-12-02 16:02:54,729 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 16:02:54,730 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:02:54,730 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:02:54,730 INFO L85 PathProgramCache]: Analyzing trace with hash -425141716, now seen corresponding path program 1 times [2023-12-02 16:02:54,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:02:54,730 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17692482] [2023-12-02 16:02:54,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:02:54,730 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:02:54,738 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:02:54,739 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [369649338] [2023-12-02 16:02:54,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:02:54,739 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:02:54,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:02:54,740 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:02:54,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 16:02:54,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:02:54,813 INFO L262 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 49 conjunts are in the unsatisfiable core [2023-12-02 16:02:54,816 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:02:55,534 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 29 proven. 39 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2023-12-02 16:02:55,534 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:02:56,953 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 28 proven. 32 refuted. 0 times theorem prover too weak. 394 trivial. 0 not checked. [2023-12-02 16:02:56,954 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:02:56,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17692482] [2023-12-02 16:02:56,954 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:02:56,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [369649338] [2023-12-02 16:02:56,954 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [369649338] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:02:56,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [796361368] [2023-12-02 16:02:56,956 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 16:02:56,956 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:02:56,956 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:02:56,956 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:02:56,956 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:02:58,221 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2023-12-02 16:02:58,241 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 16:02:58,242 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:03:00,807 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8118#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:03:00,807 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:03:00,807 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:03:00,807 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11] total 23 [2023-12-02 16:03:00,807 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467390764] [2023-12-02 16:03:00,807 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:03:00,808 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-12-02 16:03:00,808 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:03:00,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-12-02 16:03:00,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1195, Unknown=0, NotChecked=0, Total=1406 [2023-12-02 16:03:00,810 INFO L87 Difference]: Start difference. First operand 187 states and 249 transitions. Second operand has 23 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 20 states have internal predecessors, (39), 13 states have call successors, (41), 3 states have call predecessors, (41), 2 states have return successors, (40), 13 states have call predecessors, (40), 13 states have call successors, (40) [2023-12-02 16:03:12,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:03:12,329 INFO L93 Difference]: Finished difference Result 298 states and 421 transitions. [2023-12-02 16:03:12,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2023-12-02 16:03:12,329 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 20 states have internal predecessors, (39), 13 states have call successors, (41), 3 states have call predecessors, (41), 2 states have return successors, (40), 13 states have call predecessors, (40), 13 states have call successors, (40) Word has length 107 [2023-12-02 16:03:12,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:03:12,332 INFO L225 Difference]: With dead ends: 298 [2023-12-02 16:03:12,332 INFO L226 Difference]: Without dead ends: 296 [2023-12-02 16:03:12,334 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 278 SyntacticMatches, 5 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1107 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=648, Invalid=3012, Unknown=0, NotChecked=0, Total=3660 [2023-12-02 16:03:12,335 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 112 mSDsluCounter, 380 mSDsCounter, 0 mSdLazyCounter, 523 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 427 SdHoareTripleChecker+Invalid, 664 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:03:12,335 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 427 Invalid, 664 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 523 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2023-12-02 16:03:12,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2023-12-02 16:03:12,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 291. [2023-12-02 16:03:12,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 151 states have (on average 1.1721854304635762) internal successors, (177), 154 states have internal predecessors, (177), 119 states have call successors, (119), 20 states have call predecessors, (119), 20 states have return successors, (118), 116 states have call predecessors, (118), 118 states have call successors, (118) [2023-12-02 16:03:12,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 414 transitions. [2023-12-02 16:03:12,566 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 414 transitions. Word has length 107 [2023-12-02 16:03:12,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:03:12,567 INFO L495 AbstractCegarLoop]: Abstraction has 291 states and 414 transitions. [2023-12-02 16:03:12,567 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 20 states have internal predecessors, (39), 13 states have call successors, (41), 3 states have call predecessors, (41), 2 states have return successors, (40), 13 states have call predecessors, (40), 13 states have call successors, (40) [2023-12-02 16:03:12,567 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 414 transitions. [2023-12-02 16:03:12,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2023-12-02 16:03:12,568 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:03:12,569 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:03:12,574 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 16:03:12,769 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 16:03:12,769 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:03:12,769 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:03:12,769 INFO L85 PathProgramCache]: Analyzing trace with hash -743497349, now seen corresponding path program 2 times [2023-12-02 16:03:12,770 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:03:12,770 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637475254] [2023-12-02 16:03:12,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:03:12,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:03:12,781 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:03:12,781 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [51063611] [2023-12-02 16:03:12,781 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:03:12,781 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:03:12,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:03:12,783 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:03:12,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 16:03:12,865 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 16:03:12,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:03:12,867 INFO L262 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 66 conjunts are in the unsatisfiable core [2023-12-02 16:03:12,870 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:03:13,595 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 71 proven. 38 refuted. 0 times theorem prover too weak. 350 trivial. 0 not checked. [2023-12-02 16:03:13,596 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:03:14,962 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 69 proven. 35 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2023-12-02 16:03:14,962 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:03:14,962 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637475254] [2023-12-02 16:03:14,962 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:03:14,962 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51063611] [2023-12-02 16:03:14,962 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [51063611] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:03:14,963 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1542496644] [2023-12-02 16:03:14,964 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 16:03:14,965 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:03:14,965 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:03:14,965 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:03:14,965 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:03:16,527 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 16:03:16,530 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 16:03:16,531 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:03:33,767 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9807#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:03:33,768 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:03:33,768 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:03:33,768 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14] total 27 [2023-12-02 16:03:33,768 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444358] [2023-12-02 16:03:33,768 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:03:33,769 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-12-02 16:03:33,769 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:03:33,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-12-02 16:03:33,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=1871, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 16:03:33,771 INFO L87 Difference]: Start difference. First operand 291 states and 414 transitions. Second operand has 27 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 24 states have internal predecessors, (49), 13 states have call successors, (38), 3 states have call predecessors, (38), 3 states have return successors, (36), 13 states have call predecessors, (36), 11 states have call successors, (36) [2023-12-02 16:03:37,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:03:37,158 INFO L93 Difference]: Finished difference Result 342 states and 482 transitions. [2023-12-02 16:03:37,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-12-02 16:03:37,159 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 24 states have internal predecessors, (49), 13 states have call successors, (38), 3 states have call predecessors, (38), 3 states have return successors, (36), 13 states have call predecessors, (36), 11 states have call successors, (36) Word has length 110 [2023-12-02 16:03:37,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:03:37,162 INFO L225 Difference]: With dead ends: 342 [2023-12-02 16:03:37,162 INFO L226 Difference]: Without dead ends: 340 [2023-12-02 16:03:37,163 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 282 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1270 ImplicationChecksByTransitivity, 19.5s TimeCoverageRelationStatistics Valid=626, Invalid=3796, Unknown=0, NotChecked=0, Total=4422 [2023-12-02 16:03:37,164 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 84 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 470 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 356 SdHoareTripleChecker+Invalid, 610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 470 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2023-12-02 16:03:37,164 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 356 Invalid, 610 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 470 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2023-12-02 16:03:37,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2023-12-02 16:03:37,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 336. [2023-12-02 16:03:37,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 174 states have (on average 1.1666666666666667) internal successors, (203), 179 states have internal predecessors, (203), 137 states have call successors, (137), 24 states have call predecessors, (137), 24 states have return successors, (136), 132 states have call predecessors, (136), 136 states have call successors, (136) [2023-12-02 16:03:37,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 476 transitions. [2023-12-02 16:03:37,441 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 476 transitions. Word has length 110 [2023-12-02 16:03:37,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:03:37,442 INFO L495 AbstractCegarLoop]: Abstraction has 336 states and 476 transitions. [2023-12-02 16:03:37,442 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 24 states have internal predecessors, (49), 13 states have call successors, (38), 3 states have call predecessors, (38), 3 states have return successors, (36), 13 states have call predecessors, (36), 11 states have call successors, (36) [2023-12-02 16:03:37,442 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 476 transitions. [2023-12-02 16:03:37,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2023-12-02 16:03:37,444 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:03:37,444 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:03:37,450 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 16:03:37,645 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 16:03:37,645 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:03:37,645 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:03:37,645 INFO L85 PathProgramCache]: Analyzing trace with hash 1538893617, now seen corresponding path program 2 times [2023-12-02 16:03:37,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:03:37,645 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743685330] [2023-12-02 16:03:37,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:03:37,646 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:03:37,655 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:03:37,655 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1863138135] [2023-12-02 16:03:37,655 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:03:37,655 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:03:37,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:03:37,656 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:03:37,657 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 16:03:37,739 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 16:03:37,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:03:37,742 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 66 conjunts are in the unsatisfiable core [2023-12-02 16:03:37,745 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:03:38,667 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 37 proven. 46 refuted. 0 times theorem prover too weak. 502 trivial. 0 not checked. [2023-12-02 16:03:38,667 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:03:40,253 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 32 proven. 43 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2023-12-02 16:03:40,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:03:40,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743685330] [2023-12-02 16:03:40,253 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:03:40,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1863138135] [2023-12-02 16:03:40,254 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1863138135] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:03:40,254 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [555090355] [2023-12-02 16:03:40,256 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 16:03:40,256 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:03:40,256 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:03:40,256 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:03:40,257 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:03:41,982 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 16:03:41,985 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 16:03:41,985 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:04:07,651 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11706#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:04:07,652 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:04:07,652 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:04:07,652 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2023-12-02 16:04:07,652 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687774640] [2023-12-02 16:04:07,652 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:04:07,652 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-12-02 16:04:07,652 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:04:07,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-12-02 16:04:07,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=1887, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 16:04:07,654 INFO L87 Difference]: Start difference. First operand 336 states and 476 transitions. Second operand has 26 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 14 states have call successors, (44), 3 states have call predecessors, (44), 2 states have return successors, (43), 12 states have call predecessors, (43), 12 states have call successors, (43) [2023-12-02 16:04:24,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:04:24,200 INFO L93 Difference]: Finished difference Result 495 states and 722 transitions. [2023-12-02 16:04:24,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2023-12-02 16:04:24,200 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 14 states have call successors, (44), 3 states have call predecessors, (44), 2 states have return successors, (43), 12 states have call predecessors, (43), 12 states have call successors, (43) Word has length 121 [2023-12-02 16:04:24,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:04:24,204 INFO L225 Difference]: With dead ends: 495 [2023-12-02 16:04:24,204 INFO L226 Difference]: Without dead ends: 487 [2023-12-02 16:04:24,208 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 315 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2253 ImplicationChecksByTransitivity, 36.6s TimeCoverageRelationStatistics Valid=1068, Invalid=6588, Unknown=0, NotChecked=0, Total=7656 [2023-12-02 16:04:24,209 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 190 mSDsluCounter, 609 mSDsCounter, 0 mSdLazyCounter, 824 mSolverCounterSat, 291 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 671 SdHoareTripleChecker+Invalid, 1115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 291 IncrementalHoareTripleChecker+Valid, 824 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:04:24,209 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [198 Valid, 671 Invalid, 1115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [291 Valid, 824 Invalid, 0 Unknown, 0 Unchecked, 6.2s Time] [2023-12-02 16:04:24,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 487 states. [2023-12-02 16:04:24,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 487 to 469. [2023-12-02 16:04:24,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 240 states have (on average 1.1708333333333334) internal successors, (281), 247 states have internal predecessors, (281), 200 states have call successors, (200), 28 states have call predecessors, (200), 28 states have return successors, (199), 193 states have call predecessors, (199), 199 states have call successors, (199) [2023-12-02 16:04:24,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 680 transitions. [2023-12-02 16:04:24,751 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 680 transitions. Word has length 121 [2023-12-02 16:04:24,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:04:24,752 INFO L495 AbstractCegarLoop]: Abstraction has 469 states and 680 transitions. [2023-12-02 16:04:24,752 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 14 states have call successors, (44), 3 states have call predecessors, (44), 2 states have return successors, (43), 12 states have call predecessors, (43), 12 states have call successors, (43) [2023-12-02 16:04:24,752 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 680 transitions. [2023-12-02 16:04:24,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-12-02 16:04:24,754 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:04:24,754 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:04:24,759 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 16:04:24,954 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 16:04:24,955 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:04:24,955 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:04:24,955 INFO L85 PathProgramCache]: Analyzing trace with hash -263232345, now seen corresponding path program 3 times [2023-12-02 16:04:24,955 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:04:24,956 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942515699] [2023-12-02 16:04:24,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:04:24,956 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:04:24,967 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:04:24,967 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1908723525] [2023-12-02 16:04:24,967 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:04:24,968 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:04:24,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:04:24,969 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:04:24,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 16:04:25,067 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:04:25,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:04:25,070 INFO L262 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 88 conjunts are in the unsatisfiable core [2023-12-02 16:04:25,074 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:04:27,245 INFO L134 CoverageAnalysis]: Checked inductivity of 815 backedges. 177 proven. 76 refuted. 0 times theorem prover too weak. 562 trivial. 0 not checked. [2023-12-02 16:04:27,245 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:04:59,313 WARN L876 $PredicateComparison]: unable to prove that (let ((.cse8 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|)) (.cse9 (* |c_ULTIMATE.start_main_~xy~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse10 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse11 (* |c_ULTIMATE.start_main_~yy~0#1| |c_ULTIMATE.start_main_~s~0#1| |c_ULTIMATE.start_main_~k~0#1|)) (.cse4 (* |c_ULTIMATE.start_main_~yy~0#1| |c_ULTIMATE.start_main_~r~0#1|)) (.cse5 (* |c_ULTIMATE.start_main_~xy~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse6 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1| |c_ULTIMATE.start_main_~k~0#1|)) (.cse7 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse0 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse1 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|)) (.cse12 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1|)) (.cse13 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse2 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse3 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1| |c_ULTIMATE.start_main_~k~0#1|))) (or (not (= (+ .cse0 .cse1) (+ |c_ULTIMATE.start_main_~c~0#1| .cse2 .cse3))) (not (= (+ .cse4 .cse5 .cse6 .cse7) (+ .cse8 .cse9 .cse10 .cse11))) (= (+ .cse8 .cse9 (* |c_ULTIMATE.start_main_~xy~0#1| |c_ULTIMATE.start_main_~q~0#1|) .cse10 .cse11 (* |c_ULTIMATE.start_main_~yy~0#1| |c_ULTIMATE.start_main_~s~0#1|)) (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1|) .cse4 .cse5 .cse6 .cse7 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|))) (not (= (+ .cse12 .cse13) |c_ULTIMATE.start_main_~b~0#1|)) (< |c_ULTIMATE.start_main_~b~0#1| (+ |c_ULTIMATE.start_main_~c~0#1| 1)) (< (+ (* 2 .cse0) (* 2 .cse1)) (+ .cse12 .cse13 (* 2 .cse2) 1 (* 2 .cse3))))) is different from true [2023-12-02 16:07:55,093 WARN L876 $PredicateComparison]: unable to prove that (let ((.cse4 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|)) (.cse5 (* |c_ULTIMATE.start_main_~xy~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse6 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse7 (* |c_ULTIMATE.start_main_~yy~0#1| |c_ULTIMATE.start_main_~s~0#1|)) (.cse3 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1|)) (.cse1 (* |c_ULTIMATE.start_main_~yy~0#1| |c_ULTIMATE.start_main_~r~0#1|)) (.cse2 (* |c_ULTIMATE.start_main_~xy~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse11 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1|)) (.cse10 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse8 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|)) (.cse9 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|))) (or (= (+ (* 2 .cse0) .cse1 .cse2 (* 2 .cse3)) (+ .cse4 (* .cse5 2) .cse6 (* 2 .cse7))) (< (+ (* 2 .cse8) (* 2 .cse9)) (+ (* .cse10 3) (* .cse11 3) 1)) (not (= (+ .cse11 .cse10) |c_ULTIMATE.start_main_~b~0#1|)) (not (= (+ .cse4 .cse5 .cse6 .cse7) (+ .cse3 .cse1 .cse2 .cse0))) (< (+ .cse11 .cse10 |c_ULTIMATE.start_main_~b~0#1|) (+ .cse8 .cse9 1)) (not (= (+ .cse11 .cse10 |c_ULTIMATE.start_main_~a~0#1|) (+ .cse8 .cse9 |c_ULTIMATE.start_main_~b~0#1|))))) is different from true [2023-12-02 16:08:05,136 INFO L134 CoverageAnalysis]: Checked inductivity of 815 backedges. 178 proven. 34 refuted. 6 times theorem prover too weak. 570 trivial. 27 not checked. [2023-12-02 16:08:05,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:08:05,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942515699] [2023-12-02 16:08:05,137 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:08:05,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1908723525] [2023-12-02 16:08:05,137 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1908723525] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:08:05,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1375754116] [2023-12-02 16:08:05,139 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 16:08:05,139 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:08:05,139 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:08:05,139 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:08:05,139 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:08:06,295 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2023-12-02 16:08:06,315 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 16:08:06,316 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:08:27,512 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14233#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:08:27,512 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:08:27,513 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:08:27,513 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 17] total 34 [2023-12-02 16:08:27,513 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168174515] [2023-12-02 16:08:27,513 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:08:27,514 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-12-02 16:08:27,514 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:08:27,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-12-02 16:08:27,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=1848, Unknown=12, NotChecked=182, Total=2352 [2023-12-02 16:08:27,516 INFO L87 Difference]: Start difference. First operand 469 states and 680 transitions. Second operand has 34 states, 30 states have (on average 1.8) internal successors, (54), 27 states have internal predecessors, (54), 18 states have call successors, (51), 3 states have call predecessors, (51), 3 states have return successors, (50), 20 states have call predecessors, (50), 17 states have call successors, (50) [2023-12-02 16:08:31,400 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 16:08:33,885 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 16:08:35,977 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 16:08:38,042 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 16:08:40,119 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 16:08:42,241 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 16:08:47,770 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 16:08:49,780 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 16:09:02,334 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 16:09:04,337 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 16:09:50,356 WARN L293 SmtUtils]: Spent 45.61s on a formula simplification. DAG size of input: 95 DAG size of output: 94 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 16:10:11,964 WARN L293 SmtUtils]: Spent 20.03s on a formula simplification that was a NOOP. DAG size: 99 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 16:11:08,806 WARN L293 SmtUtils]: Spent 54.73s on a formula simplification. DAG size of input: 100 DAG size of output: 100 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 16:11:16,884 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 16:11:23,836 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 16:11:41,072 WARN L293 SmtUtils]: Spent 15.78s on a formula simplification that was a NOOP. DAG size: 92 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 16:12:10,424 WARN L293 SmtUtils]: Spent 24.83s on a formula simplification that was a NOOP. DAG size: 95 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 16:12:13,369 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-12-02 16:12:13,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:12:13,933 INFO L93 Difference]: Finished difference Result 552 states and 787 transitions. [2023-12-02 16:12:13,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2023-12-02 16:12:13,933 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 30 states have (on average 1.8) internal successors, (54), 27 states have internal predecessors, (54), 18 states have call successors, (51), 3 states have call predecessors, (51), 3 states have return successors, (50), 20 states have call predecessors, (50), 17 states have call successors, (50) Word has length 137 [2023-12-02 16:12:13,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:12:13,936 INFO L225 Difference]: With dead ends: 552 [2023-12-02 16:12:13,936 INFO L226 Difference]: Without dead ends: 550 [2023-12-02 16:12:13,938 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 355 SyntacticMatches, 11 SemanticMatches, 71 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 1814 ImplicationChecksByTransitivity, 232.0s TimeCoverageRelationStatistics Valid=831, Invalid=4131, Unknown=16, NotChecked=278, Total=5256 [2023-12-02 16:12:13,939 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 181 mSDsluCounter, 531 mSDsCounter, 0 mSdLazyCounter, 719 mSolverCounterSat, 231 mSolverCounterUnsat, 13 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 35.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 1285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 231 IncrementalHoareTripleChecker+Valid, 719 IncrementalHoareTripleChecker+Invalid, 13 IncrementalHoareTripleChecker+Unknown, 322 IncrementalHoareTripleChecker+Unchecked, 36.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:12:13,939 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [184 Valid, 570 Invalid, 1285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [231 Valid, 719 Invalid, 13 Unknown, 322 Unchecked, 36.0s Time] [2023-12-02 16:12:13,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 550 states. [2023-12-02 16:12:14,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 550 to 538. [2023-12-02 16:12:14,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 538 states, 279 states have (on average 1.157706093189964) internal successors, (323), 289 states have internal predecessors, (323), 224 states have call successors, (224), 34 states have call predecessors, (224), 34 states have return successors, (223), 214 states have call predecessors, (223), 223 states have call successors, (223) [2023-12-02 16:12:14,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 538 states to 538 states and 770 transitions. [2023-12-02 16:12:14,790 INFO L78 Accepts]: Start accepts. Automaton has 538 states and 770 transitions. Word has length 137 [2023-12-02 16:12:14,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:12:14,791 INFO L495 AbstractCegarLoop]: Abstraction has 538 states and 770 transitions. [2023-12-02 16:12:14,791 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 30 states have (on average 1.8) internal successors, (54), 27 states have internal predecessors, (54), 18 states have call successors, (51), 3 states have call predecessors, (51), 3 states have return successors, (50), 20 states have call predecessors, (50), 17 states have call successors, (50) [2023-12-02 16:12:14,791 INFO L276 IsEmpty]: Start isEmpty. Operand 538 states and 770 transitions. [2023-12-02 16:12:14,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2023-12-02 16:12:14,793 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:12:14,793 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:12:14,798 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 16:12:14,993 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 16:12:14,993 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:12:14,994 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:12:14,994 INFO L85 PathProgramCache]: Analyzing trace with hash -1633148449, now seen corresponding path program 3 times [2023-12-02 16:12:14,994 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:12:14,994 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107903243] [2023-12-02 16:12:14,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:12:14,994 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:12:15,004 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:12:15,004 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [997290615] [2023-12-02 16:12:15,004 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 16:12:15,004 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:12:15,004 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:12:15,005 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:12:15,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 16:12:15,087 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 16:12:15,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:12:15,090 INFO L262 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 58 conjunts are in the unsatisfiable core [2023-12-02 16:12:15,093 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:12:16,105 INFO L134 CoverageAnalysis]: Checked inductivity of 892 backedges. 41 proven. 69 refuted. 0 times theorem prover too weak. 782 trivial. 0 not checked. [2023-12-02 16:12:16,105 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:12:17,866 INFO L134 CoverageAnalysis]: Checked inductivity of 892 backedges. 40 proven. 62 refuted. 0 times theorem prover too weak. 790 trivial. 0 not checked. [2023-12-02 16:12:17,866 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:12:17,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2107903243] [2023-12-02 16:12:17,866 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:12:17,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [997290615] [2023-12-02 16:12:17,866 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [997290615] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:12:17,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1583405615] [2023-12-02 16:12:17,867 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 16:12:17,868 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:12:17,868 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:12:17,868 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:12:17,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:12:19,590 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 16:12:19,593 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 16:12:19,594 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:12:47,008 WARN L293 SmtUtils]: Spent 6.13s on a formula simplification that was a NOOP. DAG size: 47 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 16:12:47,008 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16934#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:12:47,008 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:12:47,008 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:12:47,009 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 27 [2023-12-02 16:12:47,009 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476477796] [2023-12-02 16:12:47,009 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:12:47,009 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-12-02 16:12:47,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:12:47,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-12-02 16:12:47,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=1939, Unknown=0, NotChecked=0, Total=2256 [2023-12-02 16:12:47,011 INFO L87 Difference]: Start difference. First operand 538 states and 770 transitions. Second operand has 27 states, 24 states have (on average 1.875) internal successors, (45), 24 states have internal predecessors, (45), 17 states have call successors, (53), 3 states have call predecessors, (53), 2 states have return successors, (52), 15 states have call predecessors, (52), 15 states have call successors, (52) [2023-12-02 16:13:08,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:13:08,503 INFO L93 Difference]: Finished difference Result 763 states and 1100 transitions. [2023-12-02 16:13:08,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2023-12-02 16:13:08,504 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 24 states have (on average 1.875) internal successors, (45), 24 states have internal predecessors, (45), 17 states have call successors, (53), 3 states have call predecessors, (53), 2 states have return successors, (52), 15 states have call predecessors, (52), 15 states have call successors, (52) Word has length 140 [2023-12-02 16:13:08,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:13:08,508 INFO L225 Difference]: With dead ends: 763 [2023-12-02 16:13:08,509 INFO L226 Difference]: Without dead ends: 646 [2023-12-02 16:13:08,512 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 447 GetRequests, 371 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1687 ImplicationChecksByTransitivity, 41.7s TimeCoverageRelationStatistics Valid=964, Invalid=4888, Unknown=0, NotChecked=0, Total=5852 [2023-12-02 16:13:08,513 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 140 mSDsluCounter, 663 mSDsCounter, 0 mSdLazyCounter, 879 mSolverCounterSat, 204 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 707 SdHoareTripleChecker+Invalid, 1083 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 204 IncrementalHoareTripleChecker+Valid, 879 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.6s IncrementalHoareTripleChecker+Time [2023-12-02 16:13:08,513 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [144 Valid, 707 Invalid, 1083 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [204 Valid, 879 Invalid, 0 Unknown, 0 Unchecked, 7.6s Time] [2023-12-02 16:13:08,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 646 states. [2023-12-02 16:13:09,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 646 to 623. [2023-12-02 16:13:09,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 623 states, 311 states have (on average 1.1736334405144695) internal successors, (365), 321 states have internal predecessors, (365), 276 states have call successors, (276), 35 states have call predecessors, (276), 35 states have return successors, (275), 266 states have call predecessors, (275), 275 states have call successors, (275) [2023-12-02 16:13:09,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 623 states to 623 states and 916 transitions. [2023-12-02 16:13:09,451 INFO L78 Accepts]: Start accepts. Automaton has 623 states and 916 transitions. Word has length 140 [2023-12-02 16:13:09,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:13:09,452 INFO L495 AbstractCegarLoop]: Abstraction has 623 states and 916 transitions. [2023-12-02 16:13:09,452 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 24 states have (on average 1.875) internal successors, (45), 24 states have internal predecessors, (45), 17 states have call successors, (53), 3 states have call predecessors, (53), 2 states have return successors, (52), 15 states have call predecessors, (52), 15 states have call successors, (52) [2023-12-02 16:13:09,452 INFO L276 IsEmpty]: Start isEmpty. Operand 623 states and 916 transitions. [2023-12-02 16:13:09,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2023-12-02 16:13:09,454 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:13:09,454 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 24, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:13:09,459 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 16:13:09,655 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 16:13:09,655 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:13:09,656 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:13:09,656 INFO L85 PathProgramCache]: Analyzing trace with hash -1389194927, now seen corresponding path program 4 times [2023-12-02 16:13:09,656 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:13:09,656 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603517729] [2023-12-02 16:13:09,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:13:09,656 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:13:09,665 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:13:09,665 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1093075915] [2023-12-02 16:13:09,666 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 16:13:09,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:13:09,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:13:09,667 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:13:09,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 16:13:09,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:13:09,761 INFO L262 TraceCheckSpWp]: Trace formula consists of 385 conjuncts, 75 conjunts are in the unsatisfiable core [2023-12-02 16:13:09,764 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:13:11,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1279 backedges. 49 proven. 104 refuted. 0 times theorem prover too weak. 1126 trivial. 0 not checked. [2023-12-02 16:13:11,204 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:13:16,112 INFO L134 CoverageAnalysis]: Checked inductivity of 1279 backedges. 48 proven. 97 refuted. 0 times theorem prover too weak. 1134 trivial. 0 not checked. [2023-12-02 16:13:16,112 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:13:16,112 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603517729] [2023-12-02 16:13:16,112 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:13:16,112 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1093075915] [2023-12-02 16:13:16,112 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1093075915] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:13:16,113 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [217126262] [2023-12-02 16:13:16,114 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 16:13:16,114 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:13:16,114 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:13:16,114 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:13:16,114 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:13:17,249 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2023-12-02 16:13:17,264 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 16:13:17,265 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:13:21,864 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20298#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:13:21,864 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:13:21,864 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:13:21,864 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 15] total 32 [2023-12-02 16:13:21,864 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764893852] [2023-12-02 16:13:21,864 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:13:21,865 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-12-02 16:13:21,865 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:13:21,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-12-02 16:13:21,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=1865, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 16:13:21,867 INFO L87 Difference]: Start difference. First operand 623 states and 916 transitions. Second operand has 32 states, 29 states have (on average 1.896551724137931) internal successors, (55), 29 states have internal predecessors, (55), 19 states have call successors, (61), 3 states have call predecessors, (61), 2 states have return successors, (60), 17 states have call predecessors, (60), 17 states have call successors, (60) [2023-12-02 16:14:14,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:14:14,165 INFO L93 Difference]: Finished difference Result 866 states and 1283 transitions. [2023-12-02 16:14:14,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2023-12-02 16:14:14,165 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 1.896551724137931) internal successors, (55), 29 states have internal predecessors, (55), 19 states have call successors, (61), 3 states have call predecessors, (61), 2 states have return successors, (60), 17 states have call predecessors, (60), 17 states have call successors, (60) Word has length 165 [2023-12-02 16:14:14,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:14:14,170 INFO L225 Difference]: With dead ends: 866 [2023-12-02 16:14:14,170 INFO L226 Difference]: Without dead ends: 793 [2023-12-02 16:14:14,173 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 441 SyntacticMatches, 7 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2714 ImplicationChecksByTransitivity, 50.1s TimeCoverageRelationStatistics Valid=1532, Invalid=7398, Unknown=0, NotChecked=0, Total=8930 [2023-12-02 16:14:14,174 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 204 mSDsluCounter, 837 mSDsCounter, 0 mSdLazyCounter, 1064 mSolverCounterSat, 341 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 889 SdHoareTripleChecker+Invalid, 1405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 341 IncrementalHoareTripleChecker+Valid, 1064 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2023-12-02 16:14:14,174 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 889 Invalid, 1405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [341 Valid, 1064 Invalid, 0 Unknown, 0 Unchecked, 8.7s Time] [2023-12-02 16:14:14,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 793 states. [2023-12-02 16:14:15,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 793 to 720. [2023-12-02 16:14:15,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 720 states, 353 states have (on average 1.1841359773371105) internal successors, (418), 362 states have internal predecessors, (418), 329 states have call successors, (329), 37 states have call predecessors, (329), 37 states have return successors, (328), 320 states have call predecessors, (328), 328 states have call successors, (328) [2023-12-02 16:14:15,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 720 states to 720 states and 1075 transitions. [2023-12-02 16:14:15,376 INFO L78 Accepts]: Start accepts. Automaton has 720 states and 1075 transitions. Word has length 165 [2023-12-02 16:14:15,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:14:15,377 INFO L495 AbstractCegarLoop]: Abstraction has 720 states and 1075 transitions. [2023-12-02 16:14:15,377 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 1.896551724137931) internal successors, (55), 29 states have internal predecessors, (55), 19 states have call successors, (61), 3 states have call predecessors, (61), 2 states have return successors, (60), 17 states have call predecessors, (60), 17 states have call successors, (60) [2023-12-02 16:14:15,377 INFO L276 IsEmpty]: Start isEmpty. Operand 720 states and 1075 transitions. [2023-12-02 16:14:15,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2023-12-02 16:14:15,381 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:14:15,381 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 24, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:14:15,387 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 16:14:15,582 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 16:14:15,582 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:14:15,582 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:14:15,582 INFO L85 PathProgramCache]: Analyzing trace with hash -1742592077, now seen corresponding path program 5 times [2023-12-02 16:14:15,582 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:14:15,583 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369420001] [2023-12-02 16:14:15,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:14:15,583 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:14:15,596 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:14:15,596 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1651917429] [2023-12-02 16:14:15,596 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:14:15,596 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:14:15,596 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:14:15,597 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:14:15,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 16:14:15,715 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 16:14:15,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:14:15,718 INFO L262 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 86 conjunts are in the unsatisfiable core [2023-12-02 16:14:15,723 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:14:18,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1279 backedges. 169 proven. 99 refuted. 0 times theorem prover too weak. 1011 trivial. 0 not checked. [2023-12-02 16:14:18,249 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:14:24,845 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:14:24,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369420001] [2023-12-02 16:14:24,845 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:14:24,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651917429] [2023-12-02 16:14:24,845 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1651917429] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:14:24,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [731904864] [2023-12-02 16:14:24,846 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 16:14:24,846 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:14:24,846 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:14:24,846 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:14:24,847 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:14:25,972 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 27 for LOIs [2023-12-02 16:14:25,987 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 16:14:25,988 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:14:34,828 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23855#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:14:34,828 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:14:34,828 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:14:34,828 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2023-12-02 16:14:34,828 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238021249] [2023-12-02 16:14:34,829 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 16:14:34,829 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-12-02 16:14:34,829 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:14:34,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-12-02 16:14:34,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=1961, Unknown=3, NotChecked=0, Total=2256 [2023-12-02 16:14:34,830 INFO L87 Difference]: Start difference. First operand 720 states and 1075 transitions. Second operand has 20 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 9 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 8 states have call predecessors, (22), 8 states have call successors, (22) [2023-12-02 16:14:39,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:14:39,989 INFO L93 Difference]: Finished difference Result 870 states and 1292 transitions. [2023-12-02 16:14:39,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-12-02 16:14:39,989 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 9 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 8 states have call predecessors, (22), 8 states have call successors, (22) Word has length 165 [2023-12-02 16:14:39,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:14:39,994 INFO L225 Difference]: With dead ends: 870 [2023-12-02 16:14:39,994 INFO L226 Difference]: Without dead ends: 867 [2023-12-02 16:14:39,995 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 376 SyntacticMatches, 7 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1100 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=423, Invalid=2766, Unknown=3, NotChecked=0, Total=3192 [2023-12-02 16:14:39,995 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 46 mSDsluCounter, 400 mSDsCounter, 0 mSdLazyCounter, 800 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 443 SdHoareTripleChecker+Invalid, 832 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 800 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:14:39,996 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 443 Invalid, 832 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 800 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2023-12-02 16:14:39,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 867 states. [2023-12-02 16:14:41,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 867 to 855. [2023-12-02 16:14:41,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 855 states, 420 states have (on average 1.1857142857142857) internal successors, (498), 428 states have internal predecessors, (498), 389 states have call successors, (389), 45 states have call predecessors, (389), 45 states have return successors, (388), 381 states have call predecessors, (388), 388 states have call successors, (388) [2023-12-02 16:14:41,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 855 states to 855 states and 1275 transitions. [2023-12-02 16:14:41,433 INFO L78 Accepts]: Start accepts. Automaton has 855 states and 1275 transitions. Word has length 165 [2023-12-02 16:14:41,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:14:41,434 INFO L495 AbstractCegarLoop]: Abstraction has 855 states and 1275 transitions. [2023-12-02 16:14:41,434 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 9 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 8 states have call predecessors, (22), 8 states have call successors, (22) [2023-12-02 16:14:41,434 INFO L276 IsEmpty]: Start isEmpty. Operand 855 states and 1275 transitions. [2023-12-02 16:14:41,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2023-12-02 16:14:41,437 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:14:41,437 INFO L195 NwaCegarLoop]: trace histogram [28, 27, 27, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:14:41,442 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 16:14:41,637 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:14:41,638 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:14:41,638 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:14:41,638 INFO L85 PathProgramCache]: Analyzing trace with hash -544597689, now seen corresponding path program 4 times [2023-12-02 16:14:41,638 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:14:41,638 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [578311904] [2023-12-02 16:14:41,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:14:41,638 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:14:41,648 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:14:41,649 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1562240580] [2023-12-02 16:14:41,649 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 16:14:41,649 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:14:41,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:14:41,650 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:14:41,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 16:14:41,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:14:41,754 INFO L262 TraceCheckSpWp]: Trace formula consists of 416 conjuncts, 20 conjunts are in the unsatisfiable core [2023-12-02 16:14:41,757 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:14:41,920 INFO L134 CoverageAnalysis]: Checked inductivity of 1615 backedges. 366 proven. 102 refuted. 0 times theorem prover too weak. 1147 trivial. 0 not checked. [2023-12-02 16:14:41,920 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:14:42,245 INFO L134 CoverageAnalysis]: Checked inductivity of 1615 backedges. 93 proven. 93 refuted. 0 times theorem prover too weak. 1429 trivial. 0 not checked. [2023-12-02 16:14:42,246 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:14:42,246 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [578311904] [2023-12-02 16:14:42,246 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 16:14:42,246 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1562240580] [2023-12-02 16:14:42,246 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1562240580] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:14:42,246 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [603023214] [2023-12-02 16:14:42,247 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-12-02 16:14:42,247 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:14:42,248 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:14:42,248 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:14:42,248 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:14:43,858 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-12-02 16:14:43,861 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2023-12-02 16:14:43,862 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:14:58,005 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27845#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 16:14:58,005 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:14:58,005 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:14:58,005 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2023-12-02 16:14:58,005 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107321756] [2023-12-02 16:14:58,005 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:14:58,006 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-12-02 16:14:58,006 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:14:58,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-12-02 16:14:58,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=1561, Unknown=0, NotChecked=0, Total=1806 [2023-12-02 16:14:58,007 INFO L87 Difference]: Start difference. First operand 855 states and 1275 transitions. Second operand has 23 states, 22 states have (on average 2.409090909090909) internal successors, (53), 23 states have internal predecessors, (53), 18 states have call successors, (66), 2 states have call predecessors, (66), 3 states have return successors, (66), 17 states have call predecessors, (66), 18 states have call successors, (66) [2023-12-02 16:15:00,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:15:00,316 INFO L93 Difference]: Finished difference Result 1010 states and 1475 transitions. [2023-12-02 16:15:00,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-12-02 16:15:00,317 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.409090909090909) internal successors, (53), 23 states have internal predecessors, (53), 18 states have call successors, (66), 2 states have call predecessors, (66), 3 states have return successors, (66), 17 states have call predecessors, (66), 18 states have call successors, (66) Word has length 181 [2023-12-02 16:15:00,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:15:00,320 INFO L225 Difference]: With dead ends: 1010 [2023-12-02 16:15:00,320 INFO L226 Difference]: Without dead ends: 658 [2023-12-02 16:15:00,322 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 568 GetRequests, 499 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1183 ImplicationChecksByTransitivity, 15.0s TimeCoverageRelationStatistics Valid=750, Invalid=4080, Unknown=0, NotChecked=0, Total=4830 [2023-12-02 16:15:00,323 INFO L413 NwaCegarLoop]: 94 mSDtfsCounter, 125 mSDsluCounter, 783 mSDsCounter, 0 mSdLazyCounter, 647 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 877 SdHoareTripleChecker+Invalid, 786 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 647 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 16:15:00,323 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [129 Valid, 877 Invalid, 786 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 647 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 16:15:00,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 658 states. [2023-12-02 16:15:01,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 658 to 651. [2023-12-02 16:15:01,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 651 states, 328 states have (on average 1.1280487804878048) internal successors, (370), 335 states have internal predecessors, (370), 281 states have call successors, (281), 41 states have call predecessors, (281), 41 states have return successors, (280), 274 states have call predecessors, (280), 280 states have call successors, (280) [2023-12-02 16:15:01,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 651 states to 651 states and 931 transitions. [2023-12-02 16:15:01,357 INFO L78 Accepts]: Start accepts. Automaton has 651 states and 931 transitions. Word has length 181 [2023-12-02 16:15:01,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:15:01,357 INFO L495 AbstractCegarLoop]: Abstraction has 651 states and 931 transitions. [2023-12-02 16:15:01,358 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.409090909090909) internal successors, (53), 23 states have internal predecessors, (53), 18 states have call successors, (66), 2 states have call predecessors, (66), 3 states have return successors, (66), 17 states have call predecessors, (66), 18 states have call successors, (66) [2023-12-02 16:15:01,358 INFO L276 IsEmpty]: Start isEmpty. Operand 651 states and 931 transitions. [2023-12-02 16:15:01,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2023-12-02 16:15:01,361 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:15:01,361 INFO L195 NwaCegarLoop]: trace histogram [28, 27, 27, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:15:01,367 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 16:15:01,561 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:15:01,562 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:15:01,562 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:15:01,562 INFO L85 PathProgramCache]: Analyzing trace with hash -844443178, now seen corresponding path program 5 times [2023-12-02 16:15:01,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:15:01,562 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918990202] [2023-12-02 16:15:01,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:15:01,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:15:01,573 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 16:15:01,573 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1528022296] [2023-12-02 16:15:01,573 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:15:01,573 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:15:01,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:15:01,574 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:15:01,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4bc0169-b5ce-40be-9df8-eb05b83df050/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 16:16:19,113 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 16:16:19,113 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:16:19,118 INFO L262 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 90 conjunts are in the unsatisfiable core [2023-12-02 16:16:19,123 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:16:34,927 INFO L134 CoverageAnalysis]: Checked inductivity of 1623 backedges. 387 proven. 65 refuted. 0 times theorem prover too weak. 1171 trivial. 0 not checked. [2023-12-02 16:16:34,927 INFO L327 TraceCheckSpWp]: Computing backward predicates...