./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.12.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/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_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.12.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/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_666d73f9-5e76-45e7-b2d2-1c064b900ec5/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 962623ba1d780e7ad35b9b6d7f5839750bc2f361556d46080824a3701cf71595 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 19:19:26,069 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 19:19:26,143 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 19:19:26,148 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 19:19:26,149 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 19:19:26,176 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 19:19:26,177 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 19:19:26,177 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 19:19:26,178 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 19:19:26,179 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 19:19:26,179 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 19:19:26,180 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 19:19:26,180 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 19:19:26,181 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 19:19:26,181 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 19:19:26,182 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 19:19:26,183 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 19:19:26,183 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 19:19:26,184 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 19:19:26,184 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 19:19:26,185 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 19:19:26,185 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 19:19:26,186 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 19:19:26,187 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 19:19:26,187 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 19:19:26,188 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 19:19:26,188 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 19:19:26,188 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 19:19:26,189 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 19:19:26,189 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 19:19:26,190 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 19:19:26,190 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 19:19:26,191 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 19:19:26,191 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 19:19:26,192 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 19:19:26,192 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 19:19:26,192 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 19:19:26,193 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:19:26,193 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 19:19:26,193 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 19:19:26,193 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 19:19:26,194 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 19:19:26,194 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 19:19:26,194 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 19:19:26,194 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 19:19:26,195 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 19:19:26,195 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 19:19:26,195 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_666d73f9-5e76-45e7-b2d2-1c064b900ec5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 962623ba1d780e7ad35b9b6d7f5839750bc2f361556d46080824a3701cf71595 [2023-12-02 19:19:26,441 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 19:19:26,467 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 19:19:26,471 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 19:19:26,472 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 19:19:26,473 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 19:19:26,474 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/systemc/token_ring.12.cil-1.c [2023-12-02 19:19:29,830 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 19:19:30,097 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 19:19:30,098 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/sv-benchmarks/c/systemc/token_ring.12.cil-1.c [2023-12-02 19:19:30,113 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/data/e62652f1a/12556903845a4c0abe8543e535ceff1c/FLAG38aef1071 [2023-12-02 19:19:30,129 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/data/e62652f1a/12556903845a4c0abe8543e535ceff1c [2023-12-02 19:19:30,132 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 19:19:30,134 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 19:19:30,136 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 19:19:30,136 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 19:19:30,142 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 19:19:30,143 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:19:30" (1/1) ... [2023-12-02 19:19:30,144 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ee4328 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:19:30, skipping insertion in model container [2023-12-02 19:19:30,145 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:19:30" (1/1) ... [2023-12-02 19:19:30,224 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 19:19:30,381 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_666d73f9-5e76-45e7-b2d2-1c064b900ec5/sv-benchmarks/c/systemc/token_ring.12.cil-1.c[671,684] [2023-12-02 19:19:30,536 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:19:30,551 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 19:19:30,561 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_666d73f9-5e76-45e7-b2d2-1c064b900ec5/sv-benchmarks/c/systemc/token_ring.12.cil-1.c[671,684] [2023-12-02 19:19:30,641 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:19:30,670 INFO L206 MainTranslator]: Completed translation [2023-12-02 19:19:30,671 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:19:30 WrapperNode [2023-12-02 19:19:30,671 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 19:19:30,672 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 19:19:30,672 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 19:19:30,673 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 19:19:30,679 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:19:30" (1/1) ... [2023-12-02 19:19:30,695 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:19:30" (1/1) ... [2023-12-02 19:19:30,756 INFO L138 Inliner]: procedures = 52, calls = 68, calls flagged for inlining = 35, calls inlined = 35, statements flattened = 885 [2023-12-02 19:19:30,756 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 19:19:30,757 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 19:19:30,757 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 19:19:30,757 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 19:19:30,766 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:19:30" (1/1) ... [2023-12-02 19:19:30,766 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:19:30" (1/1) ... [2023-12-02 19:19:30,771 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:19:30" (1/1) ... [2023-12-02 19:19:30,771 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:19:30" (1/1) ... [2023-12-02 19:19:30,787 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:19:30" (1/1) ... [2023-12-02 19:19:30,804 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:19:30" (1/1) ... [2023-12-02 19:19:30,808 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:19:30" (1/1) ... [2023-12-02 19:19:30,813 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:19:30" (1/1) ... [2023-12-02 19:19:30,820 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 19:19:30,821 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 19:19:30,822 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 19:19:30,822 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 19:19:30,823 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:19:30" (1/1) ... [2023-12-02 19:19:30,830 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:19:30,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:19:30,869 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 19:19:30,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 19:19:30,917 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 19:19:30,917 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-12-02 19:19:30,917 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-12-02 19:19:30,918 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-12-02 19:19:30,918 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-12-02 19:19:30,918 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-12-02 19:19:30,918 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-12-02 19:19:30,918 INFO L130 BoogieDeclarations]: Found specification of procedure error [2023-12-02 19:19:30,919 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2023-12-02 19:19:30,919 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-12-02 19:19:30,919 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-12-02 19:19:30,919 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-12-02 19:19:30,919 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-12-02 19:19:30,920 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-12-02 19:19:30,920 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-12-02 19:19:30,920 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 19:19:30,920 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 19:19:30,920 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 19:19:31,076 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 19:19:31,079 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 19:19:31,908 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 19:19:32,523 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 19:19:32,523 INFO L309 CfgBuilder]: Removed 15 assume(true) statements. [2023-12-02 19:19:32,525 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:19:32 BoogieIcfgContainer [2023-12-02 19:19:32,525 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 19:19:32,528 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 19:19:32,528 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 19:19:32,532 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 19:19:32,532 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 07:19:30" (1/3) ... [2023-12-02 19:19:32,533 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3348be49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:19:32, skipping insertion in model container [2023-12-02 19:19:32,533 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:19:30" (2/3) ... [2023-12-02 19:19:32,533 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3348be49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:19:32, skipping insertion in model container [2023-12-02 19:19:32,534 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:19:32" (3/3) ... [2023-12-02 19:19:32,535 INFO L112 eAbstractionObserver]: Analyzing ICFG token_ring.12.cil-1.c [2023-12-02 19:19:32,558 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 19:19:32,558 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 19:19:32,620 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 19:19:32,629 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;@1163e6ff, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 19:19:32,629 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 19:19:32,637 INFO L276 IsEmpty]: Start isEmpty. Operand has 207 states, 170 states have (on average 1.5235294117647058) internal successors, (259), 174 states have internal predecessors, (259), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2023-12-02 19:19:32,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2023-12-02 19:19:32,652 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:19:32,653 INFO L195 NwaCegarLoop]: trace histogram [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, 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, 1, 1, 1, 1, 1] [2023-12-02 19:19:32,654 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:19:32,660 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:19:32,660 INFO L85 PathProgramCache]: Analyzing trace with hash 772101455, now seen corresponding path program 1 times [2023-12-02 19:19:32,673 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:19:32,673 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717051701] [2023-12-02 19:19:32,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:32,674 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:19:32,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:33,147 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:19:33,148 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:19:33,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717051701] [2023-12-02 19:19:33,149 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [717051701] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:19:33,149 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:19:33,150 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 19:19:33,152 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345610517] [2023-12-02 19:19:33,152 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:19:33,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 19:19:33,158 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:19:33,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 19:19:33,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 19:19:33,196 INFO L87 Difference]: Start difference. First operand has 207 states, 170 states have (on average 1.5235294117647058) internal successors, (259), 174 states have internal predecessors, (259), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 19:19:33,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:19:33,829 INFO L93 Difference]: Finished difference Result 598 states and 927 transitions. [2023-12-02 19:19:33,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 19:19:33,833 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 67 [2023-12-02 19:19:33,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:19:33,848 INFO L225 Difference]: With dead ends: 598 [2023-12-02 19:19:33,849 INFO L226 Difference]: Without dead ends: 392 [2023-12-02 19:19:33,856 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 19:19:33,860 INFO L413 NwaCegarLoop]: 487 mSDtfsCounter, 546 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 308 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 546 SdHoareTripleChecker+Valid, 874 SdHoareTripleChecker+Invalid, 319 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 308 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 19:19:33,861 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [546 Valid, 874 Invalid, 319 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 308 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 19:19:33,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2023-12-02 19:19:33,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 391. [2023-12-02 19:19:33,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 328 states have (on average 1.4878048780487805) internal successors, (488), 331 states have internal predecessors, (488), 50 states have call successors, (50), 13 states have call predecessors, (50), 12 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2023-12-02 19:19:33,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 586 transitions. [2023-12-02 19:19:33,953 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 586 transitions. Word has length 67 [2023-12-02 19:19:33,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:19:33,954 INFO L495 AbstractCegarLoop]: Abstraction has 391 states and 586 transitions. [2023-12-02 19:19:33,954 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 19:19:33,955 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 586 transitions. [2023-12-02 19:19:33,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-12-02 19:19:33,966 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:19:33,967 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:19:33,967 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 19:19:33,967 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:19:33,968 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:19:33,969 INFO L85 PathProgramCache]: Analyzing trace with hash -932664287, now seen corresponding path program 1 times [2023-12-02 19:19:33,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:19:33,969 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337758322] [2023-12-02 19:19:33,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:33,970 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:19:34,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:34,276 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-12-02 19:19:34,277 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:19:34,277 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337758322] [2023-12-02 19:19:34,277 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [337758322] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:19:34,278 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1448189919] [2023-12-02 19:19:34,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:34,278 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:19:34,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:19:34,280 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:19:34,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 19:19:34,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:34,609 INFO L262 TraceCheckSpWp]: Trace formula consists of 990 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 19:19:34,621 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:19:34,696 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-12-02 19:19:34,696 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:19:34,697 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1448189919] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:19:34,697 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:19:34,697 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-12-02 19:19:34,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266251792] [2023-12-02 19:19:34,699 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:19:34,700 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:19:34,700 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:19:34,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:19:34,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:19:34,701 INFO L87 Difference]: Start difference. First operand 391 states and 586 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 19:19:34,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:19:34,941 INFO L93 Difference]: Finished difference Result 1156 states and 1761 transitions. [2023-12-02 19:19:34,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:19:34,942 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-12-02 19:19:34,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:19:34,952 INFO L225 Difference]: With dead ends: 1156 [2023-12-02 19:19:34,952 INFO L226 Difference]: Without dead ends: 770 [2023-12-02 19:19:34,955 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:19:34,957 INFO L413 NwaCegarLoop]: 314 mSDtfsCounter, 280 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 280 SdHoareTripleChecker+Valid, 560 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:19:34,958 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [280 Valid, 560 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 19:19:34,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 770 states. [2023-12-02 19:19:35,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 770 to 764. [2023-12-02 19:19:35,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 764 states, 647 states have (on average 1.4853168469860896) internal successors, (961), 651 states have internal predecessors, (961), 92 states have call successors, (92), 25 states have call predecessors, (92), 24 states have return successors, (90), 88 states have call predecessors, (90), 90 states have call successors, (90) [2023-12-02 19:19:35,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 764 states to 764 states and 1143 transitions. [2023-12-02 19:19:35,040 INFO L78 Accepts]: Start accepts. Automaton has 764 states and 1143 transitions. Word has length 137 [2023-12-02 19:19:35,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:19:35,041 INFO L495 AbstractCegarLoop]: Abstraction has 764 states and 1143 transitions. [2023-12-02 19:19:35,041 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 19:19:35,041 INFO L276 IsEmpty]: Start isEmpty. Operand 764 states and 1143 transitions. [2023-12-02 19:19:35,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-12-02 19:19:35,046 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:19:35,047 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:19:35,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 19:19:35,251 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:19:35,252 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:19:35,253 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:19:35,253 INFO L85 PathProgramCache]: Analyzing trace with hash -781386943, now seen corresponding path program 1 times [2023-12-02 19:19:35,253 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:19:35,254 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [395349706] [2023-12-02 19:19:35,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:35,254 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:19:35,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:35,458 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-12-02 19:19:35,459 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:19:35,459 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [395349706] [2023-12-02 19:19:35,459 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [395349706] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:19:35,459 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353559465] [2023-12-02 19:19:35,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:35,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:19:35,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:19:35,461 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:19:35,464 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 19:19:35,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:35,739 INFO L262 TraceCheckSpWp]: Trace formula consists of 984 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 19:19:35,748 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:19:35,793 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-12-02 19:19:35,794 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:19:35,794 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [353559465] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:19:35,794 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:19:35,794 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-12-02 19:19:35,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926296870] [2023-12-02 19:19:35,795 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:19:35,796 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:19:35,796 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:19:35,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:19:35,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:19:35,798 INFO L87 Difference]: Start difference. First operand 764 states and 1143 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 19:19:36,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:19:36,081 INFO L93 Difference]: Finished difference Result 2269 states and 3450 transitions. [2023-12-02 19:19:36,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:19:36,082 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-12-02 19:19:36,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:19:36,095 INFO L225 Difference]: With dead ends: 2269 [2023-12-02 19:19:36,096 INFO L226 Difference]: Without dead ends: 1510 [2023-12-02 19:19:36,100 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:19:36,102 INFO L413 NwaCegarLoop]: 312 mSDtfsCounter, 283 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 283 SdHoareTripleChecker+Valid, 558 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:19:36,103 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [283 Valid, 558 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 19:19:36,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1510 states. [2023-12-02 19:19:36,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1510 to 1502. [2023-12-02 19:19:36,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1502 states, 1279 states have (on average 1.4816262705238468) internal successors, (1895), 1285 states have internal predecessors, (1895), 174 states have call successors, (174), 49 states have call predecessors, (174), 48 states have return successors, (172), 168 states have call predecessors, (172), 172 states have call successors, (172) [2023-12-02 19:19:36,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1502 states to 1502 states and 2241 transitions. [2023-12-02 19:19:36,213 INFO L78 Accepts]: Start accepts. Automaton has 1502 states and 2241 transitions. Word has length 137 [2023-12-02 19:19:36,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:19:36,214 INFO L495 AbstractCegarLoop]: Abstraction has 1502 states and 2241 transitions. [2023-12-02 19:19:36,215 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 19:19:36,215 INFO L276 IsEmpty]: Start isEmpty. Operand 1502 states and 2241 transitions. [2023-12-02 19:19:36,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-12-02 19:19:36,223 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:19:36,223 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:19:36,232 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 19:19:36,424 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:19:36,424 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:19:36,425 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:19:36,425 INFO L85 PathProgramCache]: Analyzing trace with hash 501274657, now seen corresponding path program 1 times [2023-12-02 19:19:36,425 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:19:36,426 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991232204] [2023-12-02 19:19:36,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:36,426 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:19:36,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:36,593 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 19:19:36,594 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:19:36,594 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991232204] [2023-12-02 19:19:36,594 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1991232204] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:19:36,594 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [530069788] [2023-12-02 19:19:36,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:36,595 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:19:36,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:19:36,601 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:19:36,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 19:19:36,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:36,874 INFO L262 TraceCheckSpWp]: Trace formula consists of 978 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 19:19:36,880 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:19:36,946 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 19:19:36,947 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:19:36,947 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [530069788] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:19:36,947 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:19:36,947 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-12-02 19:19:36,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693131540] [2023-12-02 19:19:36,948 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:19:36,948 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:19:36,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:19:36,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:19:36,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:19:36,950 INFO L87 Difference]: Start difference. First operand 1502 states and 2241 transitions. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 19:19:37,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:19:37,220 INFO L93 Difference]: Finished difference Result 4471 states and 6778 transitions. [2023-12-02 19:19:37,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:19:37,221 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-12-02 19:19:37,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:19:37,239 INFO L225 Difference]: With dead ends: 4471 [2023-12-02 19:19:37,239 INFO L226 Difference]: Without dead ends: 2974 [2023-12-02 19:19:37,245 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:19:37,246 INFO L413 NwaCegarLoop]: 255 mSDtfsCounter, 268 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:19:37,247 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [268 Valid, 501 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:19:37,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2974 states. [2023-12-02 19:19:37,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2974 to 2962. [2023-12-02 19:19:37,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2962 states, 2531 states have (on average 1.477281706835243) internal successors, (3739), 2541 states have internal predecessors, (3739), 334 states have call successors, (334), 97 states have call predecessors, (334), 96 states have return successors, (332), 324 states have call predecessors, (332), 332 states have call successors, (332) [2023-12-02 19:19:37,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2962 states to 2962 states and 4405 transitions. [2023-12-02 19:19:37,386 INFO L78 Accepts]: Start accepts. Automaton has 2962 states and 4405 transitions. Word has length 137 [2023-12-02 19:19:37,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:19:37,386 INFO L495 AbstractCegarLoop]: Abstraction has 2962 states and 4405 transitions. [2023-12-02 19:19:37,386 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 19:19:37,387 INFO L276 IsEmpty]: Start isEmpty. Operand 2962 states and 4405 transitions. [2023-12-02 19:19:37,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-12-02 19:19:37,395 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:19:37,395 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:19:37,402 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 19:19:37,597 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:19:37,597 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:19:37,598 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:19:37,598 INFO L85 PathProgramCache]: Analyzing trace with hash -2004166847, now seen corresponding path program 1 times [2023-12-02 19:19:37,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:19:37,598 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1375433370] [2023-12-02 19:19:37,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:37,599 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:19:37,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:37,722 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 19:19:37,723 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:19:37,723 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1375433370] [2023-12-02 19:19:37,723 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1375433370] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:19:37,723 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [214138748] [2023-12-02 19:19:37,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:37,724 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:19:37,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:19:37,725 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:19:37,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 19:19:38,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:38,018 INFO L262 TraceCheckSpWp]: Trace formula consists of 972 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 19:19:38,023 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:19:38,089 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 19:19:38,089 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:19:38,089 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [214138748] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:19:38,089 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:19:38,090 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-12-02 19:19:38,090 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008899909] [2023-12-02 19:19:38,090 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:19:38,091 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:19:38,091 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:19:38,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:19:38,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:19:38,092 INFO L87 Difference]: Start difference. First operand 2962 states and 4405 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 19:19:38,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:19:38,411 INFO L93 Difference]: Finished difference Result 8827 states and 13334 transitions. [2023-12-02 19:19:38,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:19:38,411 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-12-02 19:19:38,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:19:38,444 INFO L225 Difference]: With dead ends: 8827 [2023-12-02 19:19:38,444 INFO L226 Difference]: Without dead ends: 5870 [2023-12-02 19:19:38,455 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:19:38,456 INFO L413 NwaCegarLoop]: 255 mSDtfsCounter, 262 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:19:38,456 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [262 Valid, 501 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 19:19:38,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5870 states. [2023-12-02 19:19:38,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5870 to 5850. [2023-12-02 19:19:38,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5850 states, 5011 states have (on average 1.4725603671921772) internal successors, (7379), 5029 states have internal predecessors, (7379), 646 states have call successors, (646), 193 states have call predecessors, (646), 192 states have return successors, (644), 628 states have call predecessors, (644), 644 states have call successors, (644) [2023-12-02 19:19:38,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5850 states to 5850 states and 8669 transitions. [2023-12-02 19:19:38,696 INFO L78 Accepts]: Start accepts. Automaton has 5850 states and 8669 transitions. Word has length 137 [2023-12-02 19:19:38,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:19:38,696 INFO L495 AbstractCegarLoop]: Abstraction has 5850 states and 8669 transitions. [2023-12-02 19:19:38,696 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 19:19:38,696 INFO L276 IsEmpty]: Start isEmpty. Operand 5850 states and 8669 transitions. [2023-12-02 19:19:38,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-12-02 19:19:38,709 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:19:38,709 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:19:38,716 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 19:19:38,910 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:19:38,910 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:19:38,911 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:19:38,911 INFO L85 PathProgramCache]: Analyzing trace with hash -1108693407, now seen corresponding path program 1 times [2023-12-02 19:19:38,911 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:19:38,911 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947629824] [2023-12-02 19:19:38,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:38,911 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:19:38,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:39,063 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 19:19:39,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:19:39,063 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947629824] [2023-12-02 19:19:39,063 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [947629824] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:19:39,063 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [13317378] [2023-12-02 19:19:39,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:39,064 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:19:39,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:19:39,065 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:19:39,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 19:19:39,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:39,375 INFO L262 TraceCheckSpWp]: Trace formula consists of 966 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 19:19:39,381 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:19:39,427 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 19:19:39,428 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:19:39,428 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [13317378] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:19:39,428 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:19:39,428 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 4 [2023-12-02 19:19:39,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156938031] [2023-12-02 19:19:39,429 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:19:39,429 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:19:39,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:19:39,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:19:39,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 19:19:39,431 INFO L87 Difference]: Start difference. First operand 5850 states and 8669 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 19:19:39,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:19:39,930 INFO L93 Difference]: Finished difference Result 17443 states and 26246 transitions. [2023-12-02 19:19:39,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:19:39,931 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-12-02 19:19:39,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:19:40,024 INFO L225 Difference]: With dead ends: 17443 [2023-12-02 19:19:40,025 INFO L226 Difference]: Without dead ends: 11598 [2023-12-02 19:19:40,051 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 19:19:40,052 INFO L413 NwaCegarLoop]: 255 mSDtfsCounter, 274 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 274 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:19:40,053 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [274 Valid, 501 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:19:40,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11598 states. [2023-12-02 19:19:40,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11598 to 11562. [2023-12-02 19:19:40,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11562 states, 9923 states have (on average 1.46760052403507) internal successors, (14563), 9957 states have internal predecessors, (14563), 1254 states have call successors, (1254), 385 states have call predecessors, (1254), 384 states have return successors, (1252), 1220 states have call predecessors, (1252), 1252 states have call successors, (1252) [2023-12-02 19:19:40,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11562 states to 11562 states and 17069 transitions. [2023-12-02 19:19:40,732 INFO L78 Accepts]: Start accepts. Automaton has 11562 states and 17069 transitions. Word has length 137 [2023-12-02 19:19:40,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:19:40,732 INFO L495 AbstractCegarLoop]: Abstraction has 11562 states and 17069 transitions. [2023-12-02 19:19:40,734 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 19:19:40,734 INFO L276 IsEmpty]: Start isEmpty. Operand 11562 states and 17069 transitions. [2023-12-02 19:19:40,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-12-02 19:19:40,767 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:19:40,768 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:19:40,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-12-02 19:19:40,968 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-12-02 19:19:40,969 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:19:40,969 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:19:40,969 INFO L85 PathProgramCache]: Analyzing trace with hash -1214196351, now seen corresponding path program 1 times [2023-12-02 19:19:40,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:19:40,969 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382027238] [2023-12-02 19:19:40,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:40,970 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:19:41,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:41,129 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 19:19:41,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:19:41,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [382027238] [2023-12-02 19:19:41,130 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [382027238] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:19:41,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1420237150] [2023-12-02 19:19:41,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:41,130 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:19:41,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:19:41,132 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:19:41,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 19:19:41,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:41,452 INFO L262 TraceCheckSpWp]: Trace formula consists of 960 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 19:19:41,457 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:19:41,530 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 19:19:41,531 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:19:41,531 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1420237150] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:19:41,531 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:19:41,531 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-12-02 19:19:41,532 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595930235] [2023-12-02 19:19:41,532 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:19:41,532 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:19:41,532 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:19:41,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:19:41,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:19:41,535 INFO L87 Difference]: Start difference. First operand 11562 states and 17069 transitions. Second operand has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 19:19:42,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:19:42,341 INFO L93 Difference]: Finished difference Result 34483 states and 51670 transitions. [2023-12-02 19:19:42,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:19:42,371 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-12-02 19:19:42,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:19:42,494 INFO L225 Difference]: With dead ends: 34483 [2023-12-02 19:19:42,495 INFO L226 Difference]: Without dead ends: 22926 [2023-12-02 19:19:42,530 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:19:42,531 INFO L413 NwaCegarLoop]: 255 mSDtfsCounter, 253 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 253 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:19:42,531 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [253 Valid, 501 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:19:42,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22926 states. [2023-12-02 19:19:43,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22926 to 22858. [2023-12-02 19:19:43,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22858 states, 19651 states have (on average 1.4624701033026308) internal successors, (28739), 19717 states have internal predecessors, (28739), 2438 states have call successors, (2438), 769 states have call predecessors, (2438), 768 states have return successors, (2436), 2372 states have call predecessors, (2436), 2436 states have call successors, (2436) [2023-12-02 19:19:43,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22858 states to 22858 states and 33613 transitions. [2023-12-02 19:19:43,430 INFO L78 Accepts]: Start accepts. Automaton has 22858 states and 33613 transitions. Word has length 137 [2023-12-02 19:19:43,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:19:43,431 INFO L495 AbstractCegarLoop]: Abstraction has 22858 states and 33613 transitions. [2023-12-02 19:19:43,431 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 19:19:43,431 INFO L276 IsEmpty]: Start isEmpty. Operand 22858 states and 33613 transitions. [2023-12-02 19:19:43,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-12-02 19:19:43,467 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:19:43,467 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:19:43,473 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 19:19:43,667 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-12-02 19:19:43,668 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:19:43,668 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:19:43,668 INFO L85 PathProgramCache]: Analyzing trace with hash 291273313, now seen corresponding path program 1 times [2023-12-02 19:19:43,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:19:43,669 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [489229454] [2023-12-02 19:19:43,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:43,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:19:43,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:43,793 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 19:19:43,793 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:19:43,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [489229454] [2023-12-02 19:19:43,794 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [489229454] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:19:43,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1674545358] [2023-12-02 19:19:43,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:43,794 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:19:43,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:19:43,795 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:19:43,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 19:19:44,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:44,093 INFO L262 TraceCheckSpWp]: Trace formula consists of 954 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 19:19:44,099 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:19:44,158 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 19:19:44,158 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:19:44,158 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1674545358] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:19:44,158 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:19:44,159 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 4 [2023-12-02 19:19:44,159 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189179899] [2023-12-02 19:19:44,159 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:19:44,160 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:19:44,160 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:19:44,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:19:44,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 19:19:44,161 INFO L87 Difference]: Start difference. First operand 22858 states and 33613 transitions. Second operand has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 19:19:45,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:19:45,260 INFO L93 Difference]: Finished difference Result 68179 states and 101718 transitions. [2023-12-02 19:19:45,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:19:45,261 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2023-12-02 19:19:45,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:19:45,492 INFO L225 Difference]: With dead ends: 68179 [2023-12-02 19:19:45,492 INFO L226 Difference]: Without dead ends: 45326 [2023-12-02 19:19:45,560 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 19:19:45,561 INFO L413 NwaCegarLoop]: 255 mSDtfsCounter, 256 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:19:45,562 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 501 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:19:45,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45326 states. [2023-12-02 19:19:47,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45326 to 45194. [2023-12-02 19:19:47,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45194 states, 38915 states have (on average 1.4572015932159836) internal successors, (56707), 39045 states have internal predecessors, (56707), 4742 states have call successors, (4742), 1537 states have call predecessors, (4742), 1536 states have return successors, (4740), 4612 states have call predecessors, (4740), 4740 states have call successors, (4740) [2023-12-02 19:19:47,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45194 states to 45194 states and 66189 transitions. [2023-12-02 19:19:47,584 INFO L78 Accepts]: Start accepts. Automaton has 45194 states and 66189 transitions. Word has length 137 [2023-12-02 19:19:47,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:19:47,584 INFO L495 AbstractCegarLoop]: Abstraction has 45194 states and 66189 transitions. [2023-12-02 19:19:47,584 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-12-02 19:19:47,584 INFO L276 IsEmpty]: Start isEmpty. Operand 45194 states and 66189 transitions. [2023-12-02 19:19:47,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2023-12-02 19:19:47,656 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:19:47,656 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:19:47,663 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 19:19:47,857 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-12-02 19:19:47,857 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:19:47,860 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:19:47,860 INFO L85 PathProgramCache]: Analyzing trace with hash 1689528705, now seen corresponding path program 1 times [2023-12-02 19:19:47,860 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:19:47,860 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [539874700] [2023-12-02 19:19:47,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:47,860 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:19:47,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:48,561 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2023-12-02 19:19:48,561 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:19:48,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [539874700] [2023-12-02 19:19:48,561 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [539874700] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:19:48,561 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:19:48,561 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 19:19:48,562 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250127949] [2023-12-02 19:19:48,562 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:19:48,562 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 19:19:48,563 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:19:48,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 19:19:48,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-12-02 19:19:48,564 INFO L87 Difference]: Start difference. First operand 45194 states and 66189 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-12-02 19:19:52,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:19:52,095 INFO L93 Difference]: Finished difference Result 145682 states and 214163 transitions. [2023-12-02 19:19:52,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 19:19:52,096 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 137 [2023-12-02 19:19:52,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:19:52,438 INFO L225 Difference]: With dead ends: 145682 [2023-12-02 19:19:52,438 INFO L226 Difference]: Without dead ends: 100494 [2023-12-02 19:19:52,514 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-12-02 19:19:52,515 INFO L413 NwaCegarLoop]: 281 mSDtfsCounter, 882 mSDsluCounter, 651 mSDsCounter, 0 mSdLazyCounter, 406 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 903 SdHoareTripleChecker+Valid, 932 SdHoareTripleChecker+Invalid, 515 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 406 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 19:19:52,516 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [903 Valid, 932 Invalid, 515 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 406 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 19:19:52,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100494 states. [2023-12-02 19:19:56,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100494 to 88842. [2023-12-02 19:19:56,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88842 states, 76547 states have (on average 1.4514873215148862) internal successors, (111107), 76805 states have internal predecessors, (111107), 9222 states have call successors, (9222), 3073 states have call predecessors, (9222), 3072 states have return successors, (9220), 8964 states have call predecessors, (9220), 9220 states have call successors, (9220) [2023-12-02 19:19:56,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88842 states to 88842 states and 129549 transitions. [2023-12-02 19:19:56,810 INFO L78 Accepts]: Start accepts. Automaton has 88842 states and 129549 transitions. Word has length 137 [2023-12-02 19:19:56,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:19:56,810 INFO L495 AbstractCegarLoop]: Abstraction has 88842 states and 129549 transitions. [2023-12-02 19:19:56,811 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-12-02 19:19:56,811 INFO L276 IsEmpty]: Start isEmpty. Operand 88842 states and 129549 transitions. [2023-12-02 19:19:56,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2023-12-02 19:19:56,950 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:19:56,950 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:19:56,951 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-12-02 19:19:56,951 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:19:56,951 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:19:56,952 INFO L85 PathProgramCache]: Analyzing trace with hash -977482666, now seen corresponding path program 1 times [2023-12-02 19:19:56,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:19:56,952 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766897617] [2023-12-02 19:19:56,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:56,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:19:57,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:57,509 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 19:19:57,509 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:19:57,509 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766897617] [2023-12-02 19:19:57,509 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766897617] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:19:57,509 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927554187] [2023-12-02 19:19:57,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:57,510 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:19:57,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:19:57,511 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:19:57,520 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 19:19:57,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:19:57,776 INFO L262 TraceCheckSpWp]: Trace formula consists of 988 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 19:19:57,781 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:19:57,825 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-12-02 19:19:57,825 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:19:57,825 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927554187] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:19:57,825 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:19:57,825 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 19:19:57,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394897413] [2023-12-02 19:19:57,826 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:19:57,827 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:19:57,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:19:57,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:19:57,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 19:19:57,828 INFO L87 Difference]: Start difference. First operand 88842 states and 129549 transitions. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 19:20:01,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:20:01,246 INFO L93 Difference]: Finished difference Result 159118 states and 235408 transitions. [2023-12-02 19:20:01,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:20:01,247 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 160 [2023-12-02 19:20:01,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:20:01,750 INFO L225 Difference]: With dead ends: 159118 [2023-12-02 19:20:01,750 INFO L226 Difference]: Without dead ends: 113802 [2023-12-02 19:20:01,903 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 19:20:01,904 INFO L413 NwaCegarLoop]: 399 mSDtfsCounter, 138 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 666 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:20:01,904 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [138 Valid, 666 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:20:02,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113802 states. [2023-12-02 19:20:06,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113802 to 107914. [2023-12-02 19:20:06,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107914 states, 95107 states have (on average 1.4804693660824124) internal successors, (140803), 95365 states have internal predecessors, (140803), 9478 states have call successors, (9478), 3329 states have call predecessors, (9478), 3328 states have return successors, (9476), 9220 states have call predecessors, (9476), 9476 states have call successors, (9476) [2023-12-02 19:20:06,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107914 states to 107914 states and 159757 transitions. [2023-12-02 19:20:06,911 INFO L78 Accepts]: Start accepts. Automaton has 107914 states and 159757 transitions. Word has length 160 [2023-12-02 19:20:06,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:20:06,912 INFO L495 AbstractCegarLoop]: Abstraction has 107914 states and 159757 transitions. [2023-12-02 19:20:06,912 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-12-02 19:20:06,912 INFO L276 IsEmpty]: Start isEmpty. Operand 107914 states and 159757 transitions. [2023-12-02 19:20:07,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2023-12-02 19:20:07,079 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:20:07,079 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 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, 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 19:20:07,085 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 19:20:07,279 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:20:07,280 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:20:07,280 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:20:07,280 INFO L85 PathProgramCache]: Analyzing trace with hash -1093359273, now seen corresponding path program 1 times [2023-12-02 19:20:07,281 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:20:07,281 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831410372] [2023-12-02 19:20:07,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:20:07,281 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:20:07,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:20:07,728 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 10 proven. 81 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2023-12-02 19:20:07,729 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:20:07,729 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831410372] [2023-12-02 19:20:07,729 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1831410372] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:20:07,729 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [888438410] [2023-12-02 19:20:07,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:20:07,729 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:20:07,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:20:07,730 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:20:07,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 19:20:08,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:20:08,150 INFO L262 TraceCheckSpWp]: Trace formula consists of 1251 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 19:20:08,156 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:20:08,344 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 101 proven. 0 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-12-02 19:20:08,344 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:20:08,344 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [888438410] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:20:08,344 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:20:08,344 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2023-12-02 19:20:08,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837707493] [2023-12-02 19:20:08,345 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:20:08,346 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:20:08,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:20:08,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:20:08,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 19:20:08,347 INFO L87 Difference]: Start difference. First operand 107914 states and 159757 transitions. Second operand has 3 states, 3 states have (on average 45.333333333333336) internal successors, (136), 2 states have internal predecessors, (136), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 19:20:14,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:20:14,362 INFO L93 Difference]: Finished difference Result 322195 states and 482326 transitions. [2023-12-02 19:20:14,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:20:14,363 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 45.333333333333336) internal successors, (136), 2 states have internal predecessors, (136), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 211 [2023-12-02 19:20:14,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:20:15,000 INFO L225 Difference]: With dead ends: 322195 [2023-12-02 19:20:15,001 INFO L226 Difference]: Without dead ends: 214286 [2023-12-02 19:20:15,275 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 19:20:15,275 INFO L413 NwaCegarLoop]: 255 mSDtfsCounter, 206 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:20:15,276 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [206 Valid, 501 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:20:15,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214286 states. [2023-12-02 19:20:22,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214286 to 213514. [2023-12-02 19:20:23,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213514 states, 188419 states have (on average 1.4755359066760783) internal successors, (278019), 188933 states have internal predecessors, (278019), 18438 states have call successors, (18438), 6657 states have call predecessors, (18438), 6656 states have return successors, (18436), 17924 states have call predecessors, (18436), 18436 states have call successors, (18436) [2023-12-02 19:20:24,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213514 states to 213514 states and 314893 transitions. [2023-12-02 19:20:24,041 INFO L78 Accepts]: Start accepts. Automaton has 213514 states and 314893 transitions. Word has length 211 [2023-12-02 19:20:24,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:20:24,041 INFO L495 AbstractCegarLoop]: Abstraction has 213514 states and 314893 transitions. [2023-12-02 19:20:24,042 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 45.333333333333336) internal successors, (136), 2 states have internal predecessors, (136), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 19:20:24,042 INFO L276 IsEmpty]: Start isEmpty. Operand 213514 states and 314893 transitions. [2023-12-02 19:20:24,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2023-12-02 19:20:24,448 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:20:24,449 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 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, 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 19:20:24,457 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 19:20:24,649 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:20:24,650 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:20:24,650 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:20:24,650 INFO L85 PathProgramCache]: Analyzing trace with hash 594716526, now seen corresponding path program 1 times [2023-12-02 19:20:24,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:20:24,650 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1379021869] [2023-12-02 19:20:24,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:20:24,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:20:24,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:20:25,287 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 10 proven. 81 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2023-12-02 19:20:25,288 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:20:25,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1379021869] [2023-12-02 19:20:25,288 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1379021869] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:20:25,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [440712915] [2023-12-02 19:20:25,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:20:25,288 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:20:25,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:20:25,289 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:20:25,300 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 19:20:25,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:20:25,596 INFO L262 TraceCheckSpWp]: Trace formula consists of 1251 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 19:20:25,602 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:20:25,788 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 103 proven. 0 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-12-02 19:20:25,788 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:20:25,788 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [440712915] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:20:25,788 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:20:25,788 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2023-12-02 19:20:25,789 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378610038] [2023-12-02 19:20:25,789 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:20:25,789 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:20:25,790 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:20:25,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:20:25,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 19:20:25,791 INFO L87 Difference]: Start difference. First operand 213514 states and 314893 transitions. Second operand has 3 states, 3 states have (on average 46.0) internal successors, (138), 2 states have internal predecessors, (138), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 19:20:38,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:20:38,075 INFO L93 Difference]: Finished difference Result 637459 states and 950294 transitions. [2023-12-02 19:20:38,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:20:38,076 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 46.0) internal successors, (138), 2 states have internal predecessors, (138), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 211 [2023-12-02 19:20:38,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:20:39,386 INFO L225 Difference]: With dead ends: 637459 [2023-12-02 19:20:39,386 INFO L226 Difference]: Without dead ends: 423950 [2023-12-02 19:20:39,760 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 19:20:39,761 INFO L413 NwaCegarLoop]: 255 mSDtfsCounter, 206 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:20:39,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [206 Valid, 501 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:20:40,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423950 states. [2023-12-02 19:20:54,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423950 to 422410. [2023-12-02 19:20:54,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 422410 states, 373251 states have (on average 1.4705037628834217) internal successors, (548867), 374277 states have internal predecessors, (548867), 35846 states have call successors, (35846), 13313 states have call predecessors, (35846), 13312 states have return successors, (35844), 34820 states have call predecessors, (35844), 35844 states have call successors, (35844) [2023-12-02 19:20:56,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422410 states to 422410 states and 620557 transitions. [2023-12-02 19:20:56,899 INFO L78 Accepts]: Start accepts. Automaton has 422410 states and 620557 transitions. Word has length 211 [2023-12-02 19:20:56,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:20:56,900 INFO L495 AbstractCegarLoop]: Abstraction has 422410 states and 620557 transitions. [2023-12-02 19:20:56,900 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 46.0) internal successors, (138), 2 states have internal predecessors, (138), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 19:20:56,900 INFO L276 IsEmpty]: Start isEmpty. Operand 422410 states and 620557 transitions. [2023-12-02 19:20:57,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2023-12-02 19:20:57,870 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:20:57,870 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 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, 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 19:20:57,877 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 19:20:58,070 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 19:20:58,071 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:20:58,071 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:20:58,071 INFO L85 PathProgramCache]: Analyzing trace with hash -478240643, now seen corresponding path program 1 times [2023-12-02 19:20:58,071 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:20:58,071 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58563754] [2023-12-02 19:20:58,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:20:58,072 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:20:58,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:20:58,424 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 10 proven. 81 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2023-12-02 19:20:58,425 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:20:58,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58563754] [2023-12-02 19:20:58,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [58563754] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:20:58,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2069020] [2023-12-02 19:20:58,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:20:58,425 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:20:58,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:20:58,426 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:20:58,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_666d73f9-5e76-45e7-b2d2-1c064b900ec5/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 19:20:58,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:20:58,745 INFO L262 TraceCheckSpWp]: Trace formula consists of 1251 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 19:20:58,752 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:20:58,894 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 105 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-12-02 19:20:58,894 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:20:58,894 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2069020] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:20:58,894 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:20:58,895 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2023-12-02 19:20:58,895 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540233048] [2023-12-02 19:20:58,895 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:20:58,895 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:20:58,896 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:20:58,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:20:58,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 19:20:58,897 INFO L87 Difference]: Start difference. First operand 422410 states and 620557 transitions. Second operand has 3 states, 3 states have (on average 46.666666666666664) internal successors, (140), 2 states have internal predecessors, (140), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 19:21:23,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:21:23,088 INFO L93 Difference]: Finished difference Result 1261075 states and 1871894 transitions. [2023-12-02 19:21:23,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:21:23,089 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 46.666666666666664) internal successors, (140), 2 states have internal predecessors, (140), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 211 [2023-12-02 19:21:23,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:21:26,056 INFO L225 Difference]: With dead ends: 1261075 [2023-12-02 19:21:26,056 INFO L226 Difference]: Without dead ends: 838670 [2023-12-02 19:21:27,178 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-12-02 19:21:27,179 INFO L413 NwaCegarLoop]: 255 mSDtfsCounter, 206 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 19:21:27,179 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [206 Valid, 501 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 19:21:27,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 838670 states.