./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pals_lcr.4.ufo.UNBOUNDED.pals+Problem12_label00.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6a47aea7 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.4.ufo.UNBOUNDED.pals+Problem12_label00.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl --witnessprinter.witness.filename witness.graphml --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 355b6431f903a7e9642ff9c83d141a20cc82336cba9865af34a1f63508906235 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:28:22,029 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:28:22,031 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:28:22,067 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:28:22,067 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:28:22,069 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:28:22,071 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:28:22,074 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:28:22,077 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:28:22,078 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:28:22,080 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:28:22,081 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:28:22,082 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:28:22,084 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:28:22,086 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:28:22,088 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:28:22,089 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:28:22,090 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:28:22,093 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:28:22,096 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:28:22,098 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:28:22,100 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:28:22,102 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:28:22,103 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:28:22,107 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:28:22,108 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:28:22,108 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:28:22,110 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:28:22,111 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:28:22,112 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:28:22,113 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:28:22,114 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:28:22,115 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:28:22,116 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:28:22,118 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:28:22,119 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:28:22,120 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:28:22,120 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:28:22,121 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:28:22,122 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:28:22,124 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:28:22,126 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:28:22,177 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:28:22,178 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:28:22,178 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:28:22,178 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:28:22,179 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:28:22,180 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:28:22,180 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:28:22,180 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:28:22,181 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:28:22,184 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:28:22,186 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:28:22,186 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:28:22,186 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:28:22,186 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:28:22,187 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:28:22,187 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:28:22,187 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:28:22,188 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:28:22,189 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:28:22,189 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:28:22,189 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:28:22,190 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:28:22,190 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:28:22,191 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:28:22,191 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:28:22,191 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:28:22,191 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:28:22,192 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:28:22,192 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:28:22,192 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:28:22,193 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:28:22,193 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:28:22,193 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:28:22,194 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:28:22,194 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:28:22,194 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:28:22,195 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:28:22,195 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:28:22,195 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:28:22,196 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:28:22,196 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:28:22,196 INFO L138 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_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 355b6431f903a7e9642ff9c83d141a20cc82336cba9865af34a1f63508906235 [2021-11-23 17:28:22,587 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:28:22,627 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:28:22,630 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:28:22,631 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:28:22,632 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:28:22,633 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.4.ufo.UNBOUNDED.pals+Problem12_label00.c [2021-11-23 17:28:22,709 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/data/a02139dd6/da2ad52f1fb04f02b081b4e778e92e7f/FLAG208f7b7e1 [2021-11-23 17:28:23,672 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:28:23,672 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/sv-benchmarks/c/combinations/pals_lcr.4.ufo.UNBOUNDED.pals+Problem12_label00.c [2021-11-23 17:28:23,732 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/data/a02139dd6/da2ad52f1fb04f02b081b4e778e92e7f/FLAG208f7b7e1 [2021-11-23 17:28:24,131 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/data/a02139dd6/da2ad52f1fb04f02b081b4e778e92e7f [2021-11-23 17:28:24,135 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:28:24,138 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:28:24,141 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:28:24,142 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:28:24,146 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:28:24,147 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:28:24" (1/1) ... [2021-11-23 17:28:24,148 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55f5e539 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:24, skipping insertion in model container [2021-11-23 17:28:24,148 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:28:24" (1/1) ... [2021-11-23 17:28:24,157 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:28:24,363 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:28:24,752 WARN L230 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_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/sv-benchmarks/c/combinations/pals_lcr.4.ufo.UNBOUNDED.pals+Problem12_label00.c[8712,8725] [2021-11-23 17:28:24,782 WARN L230 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_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/sv-benchmarks/c/combinations/pals_lcr.4.ufo.UNBOUNDED.pals+Problem12_label00.c[10587,10600] [2021-11-23 17:28:25,826 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:28:25,840 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:28:25,893 WARN L230 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_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/sv-benchmarks/c/combinations/pals_lcr.4.ufo.UNBOUNDED.pals+Problem12_label00.c[8712,8725] [2021-11-23 17:28:25,899 WARN L230 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_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/sv-benchmarks/c/combinations/pals_lcr.4.ufo.UNBOUNDED.pals+Problem12_label00.c[10587,10600] [2021-11-23 17:28:26,508 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:28:26,539 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:28:26,540 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:26 WrapperNode [2021-11-23 17:28:26,540 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:28:26,541 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:28:26,542 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:28:26,542 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:28:26,550 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:26" (1/1) ... [2021-11-23 17:28:26,612 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:26" (1/1) ... [2021-11-23 17:28:27,119 INFO L137 Inliner]: procedures = 36, calls = 21, calls flagged for inlining = 16, calls inlined = 16, statements flattened = 5031 [2021-11-23 17:28:27,119 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:28:27,121 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:28:27,121 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:28:27,121 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:28:27,133 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:26" (1/1) ... [2021-11-23 17:28:27,133 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:26" (1/1) ... [2021-11-23 17:28:27,208 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:26" (1/1) ... [2021-11-23 17:28:27,209 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:26" (1/1) ... [2021-11-23 17:28:27,341 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:26" (1/1) ... [2021-11-23 17:28:27,368 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:26" (1/1) ... [2021-11-23 17:28:27,389 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:26" (1/1) ... [2021-11-23 17:28:27,599 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:28:27,600 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:28:27,600 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:28:27,600 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:28:27,601 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:26" (1/1) ... [2021-11-23 17:28:27,619 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:28:27,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:28:27,680 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:28:27,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:28:27,779 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:28:27,779 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:28:27,779 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:28:27,780 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:28:27,932 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:28:27,947 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:28:32,991 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:28:33,061 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 17:28:33,068 INFO L158 Benchmark]: Toolchain (without parser) took 8927.20ms. Allocated memory was 111.1MB in the beginning and 379.6MB in the end (delta: 268.4MB). Free memory was 58.1MB in the beginning and 248.9MB in the end (delta: -190.8MB). Peak memory consumption was 233.3MB. Max. memory is 16.1GB. [2021-11-23 17:28:33,068 INFO L158 Benchmark]: CDTParser took 0.31ms. Allocated memory is still 111.1MB. Free memory is still 89.0MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:28:33,070 INFO L158 Benchmark]: CACSL2BoogieTranslator took 2398.89ms. Allocated memory was 111.1MB in the beginning and 144.7MB in the end (delta: 33.6MB). Free memory was 57.9MB in the beginning and 69.3MB in the end (delta: -11.5MB). Peak memory consumption was 47.3MB. Max. memory is 16.1GB. [2021-11-23 17:28:33,072 INFO L158 Benchmark]: Boogie Procedure Inliner took 578.28ms. Allocated memory was 144.7MB in the beginning and 184.5MB in the end (delta: 39.8MB). Free memory was 69.3MB in the beginning and 90.3MB in the end (delta: -20.9MB). Peak memory consumption was 69.7MB. Max. memory is 16.1GB. [2021-11-23 17:28:33,073 INFO L158 Benchmark]: Boogie Preprocessor took 478.18ms. Allocated memory is still 184.5MB. Free memory was 90.3MB in the beginning and 67.0MB in the end (delta: 23.3MB). Peak memory consumption was 51.4MB. Max. memory is 16.1GB. [2021-11-23 17:28:33,074 INFO L158 Benchmark]: RCFGBuilder took 5464.85ms. Allocated memory was 184.5MB in the beginning and 379.6MB in the end (delta: 195.0MB). Free memory was 67.0MB in the beginning and 248.9MB in the end (delta: -182.0MB). Peak memory consumption was 172.0MB. Max. memory is 16.1GB. [2021-11-23 17:28:33,084 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.31ms. Allocated memory is still 111.1MB. Free memory is still 89.0MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 2398.89ms. Allocated memory was 111.1MB in the beginning and 144.7MB in the end (delta: 33.6MB). Free memory was 57.9MB in the beginning and 69.3MB in the end (delta: -11.5MB). Peak memory consumption was 47.3MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 578.28ms. Allocated memory was 144.7MB in the beginning and 184.5MB in the end (delta: 39.8MB). Free memory was 69.3MB in the beginning and 90.3MB in the end (delta: -20.9MB). Peak memory consumption was 69.7MB. Max. memory is 16.1GB. * Boogie Preprocessor took 478.18ms. Allocated memory is still 184.5MB. Free memory was 90.3MB in the beginning and 67.0MB in the end (delta: 23.3MB). Peak memory consumption was 51.4MB. Max. memory is 16.1GB. * RCFGBuilder took 5464.85ms. Allocated memory was 184.5MB in the beginning and 379.6MB in the end (delta: 195.0MB). Free memory was 67.0MB in the beginning and 248.9MB in the end (delta: -182.0MB). Peak memory consumption was 172.0MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 17:28:33,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.4.ufo.UNBOUNDED.pals+Problem12_label00.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl --witnessprinter.witness.filename witness.graphml --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 355b6431f903a7e9642ff9c83d141a20cc82336cba9865af34a1f63508906235 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:28:35,827 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:28:35,830 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:28:35,866 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:28:35,867 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:28:35,869 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:28:35,871 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:28:35,874 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:28:35,877 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:28:35,878 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:28:35,880 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:28:35,882 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:28:35,882 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:28:35,884 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:28:35,886 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:28:35,888 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:28:35,889 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:28:35,891 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:28:35,894 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:28:35,897 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:28:35,899 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:28:35,901 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:28:35,903 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:28:35,904 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:28:35,908 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:28:35,909 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:28:35,910 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:28:35,911 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:28:35,912 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:28:35,913 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:28:35,914 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:28:35,915 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:28:35,916 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:28:35,917 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:28:35,919 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:28:35,920 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:28:35,921 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:28:35,921 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:28:35,922 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:28:35,923 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:28:35,924 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:28:35,926 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:28:35,968 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:28:35,968 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:28:35,969 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:28:35,969 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:28:35,970 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:28:35,971 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:28:35,971 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:28:35,971 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:28:35,971 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:28:35,971 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:28:35,973 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:28:35,973 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:28:35,974 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:28:35,975 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:28:35,975 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:28:35,975 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:28:35,975 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:28:35,976 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:28:35,976 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:28:35,976 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:28:35,976 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:28:35,976 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:28:35,977 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:28:35,977 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:28:35,977 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:28:35,977 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:28:35,977 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:28:35,978 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:28:35,978 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:28:35,978 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:28:35,978 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:28:35,978 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:28:35,979 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:28:35,979 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:28:35,979 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:35,979 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:28:35,980 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:28:35,980 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:28:35,980 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 355b6431f903a7e9642ff9c83d141a20cc82336cba9865af34a1f63508906235 [2021-11-23 17:28:36,404 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:28:36,443 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:28:36,446 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:28:36,447 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:28:36,448 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:28:36,449 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.4.ufo.UNBOUNDED.pals+Problem12_label00.c [2021-11-23 17:28:36,532 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/data/dda10d771/a63a9d079a0548c8a5e5ce3f536032e7/FLAG2390d2325 [2021-11-23 17:28:37,641 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:28:37,642 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/sv-benchmarks/c/combinations/pals_lcr.4.ufo.UNBOUNDED.pals+Problem12_label00.c [2021-11-23 17:28:37,678 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/data/dda10d771/a63a9d079a0548c8a5e5ce3f536032e7/FLAG2390d2325 [2021-11-23 17:28:38,018 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/data/dda10d771/a63a9d079a0548c8a5e5ce3f536032e7 [2021-11-23 17:28:38,021 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:28:38,022 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:28:38,024 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:28:38,024 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:28:38,041 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:28:38,042 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:28:38" (1/1) ... [2021-11-23 17:28:38,043 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ee6b4a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:38, skipping insertion in model container [2021-11-23 17:28:38,044 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:28:38" (1/1) ... [2021-11-23 17:28:38,052 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:28:38,201 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:28:38,711 WARN L230 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_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/sv-benchmarks/c/combinations/pals_lcr.4.ufo.UNBOUNDED.pals+Problem12_label00.c[8712,8725] [2021-11-23 17:28:38,775 WARN L230 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_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/sv-benchmarks/c/combinations/pals_lcr.4.ufo.UNBOUNDED.pals+Problem12_label00.c[10587,10600] [2021-11-23 17:28:40,133 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:28:40,150 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:28:40,204 WARN L230 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_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/sv-benchmarks/c/combinations/pals_lcr.4.ufo.UNBOUNDED.pals+Problem12_label00.c[8712,8725] [2021-11-23 17:28:40,209 WARN L230 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_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/sv-benchmarks/c/combinations/pals_lcr.4.ufo.UNBOUNDED.pals+Problem12_label00.c[10587,10600] [2021-11-23 17:28:41,028 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:28:41,082 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:28:41,082 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:41 WrapperNode [2021-11-23 17:28:41,082 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:28:41,083 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:28:41,084 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:28:41,084 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:28:41,104 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:41" (1/1) ... [2021-11-23 17:28:41,238 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:41" (1/1) ... [2021-11-23 17:28:41,443 INFO L137 Inliner]: procedures = 37, calls = 21, calls flagged for inlining = 16, calls inlined = 16, statements flattened = 5010 [2021-11-23 17:28:41,448 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:28:41,449 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:28:41,450 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:28:41,450 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:28:41,458 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:41" (1/1) ... [2021-11-23 17:28:41,458 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:41" (1/1) ... [2021-11-23 17:28:41,505 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:41" (1/1) ... [2021-11-23 17:28:41,505 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:41" (1/1) ... [2021-11-23 17:28:41,768 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:41" (1/1) ... [2021-11-23 17:28:41,824 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:41" (1/1) ... [2021-11-23 17:28:41,873 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:41" (1/1) ... [2021-11-23 17:28:41,916 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:28:41,953 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:28:41,953 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:28:41,953 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:28:41,954 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:41" (1/1) ... [2021-11-23 17:28:41,962 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:28:41,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:28:42,010 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:28:42,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:28:42,108 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:28:42,108 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:28:42,109 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:28:42,109 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:28:42,221 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:28:42,223 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:29:10,291 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:29:10,316 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:29:10,316 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 17:29:10,320 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:29:10 BoogieIcfgContainer [2021-11-23 17:29:10,321 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:29:10,322 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:29:10,322 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:29:10,325 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:29:10,326 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:28:38" (1/3) ... [2021-11-23 17:29:10,327 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69b046ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:29:10, skipping insertion in model container [2021-11-23 17:29:10,327 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:41" (2/3) ... [2021-11-23 17:29:10,327 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69b046ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:29:10, skipping insertion in model container [2021-11-23 17:29:10,328 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:29:10" (3/3) ... [2021-11-23 17:29:10,329 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.4.ufo.UNBOUNDED.pals+Problem12_label00.c [2021-11-23 17:29:10,335 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:29:10,336 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 17:29:10,393 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:29:10,400 INFO L339 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=LoopsAndPotentialCycles, 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 17:29:10,400 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 17:29:10,441 INFO L276 IsEmpty]: Start isEmpty. Operand has 895 states, 892 states have (on average 1.9013452914798206) internal successors, (1696), 894 states have internal predecessors, (1696), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:10,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 17:29:10,448 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:10,448 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:29:10,449 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:10,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:10,455 INFO L85 PathProgramCache]: Analyzing trace with hash -944947467, now seen corresponding path program 1 times [2021-11-23 17:29:10,467 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:10,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1430463411] [2021-11-23 17:29:10,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:10,469 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:10,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:10,470 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:10,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:29:10,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:10,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:29:10,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:10,719 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:10,720 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:29:10,721 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:10,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1430463411] [2021-11-23 17:29:10,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1430463411] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:29:10,722 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:29:10,722 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:29:10,724 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572988882] [2021-11-23 17:29:10,725 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:29:10,729 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:29:10,745 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:10,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:29:10,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:29:10,804 INFO L87 Difference]: Start difference. First operand has 895 states, 892 states have (on average 1.9013452914798206) internal successors, (1696), 894 states have internal predecessors, (1696), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 2 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:48,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:48,201 INFO L93 Difference]: Finished difference Result 2514 states and 4838 transitions. [2021-11-23 17:29:48,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:29:48,204 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 2 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-23 17:29:48,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:48,244 INFO L225 Difference]: With dead ends: 2514 [2021-11-23 17:29:48,244 INFO L226 Difference]: Without dead ends: 1580 [2021-11-23 17:29:48,252 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:29:48,256 INFO L933 BasicCegarLoop]: 596 mSDtfsCounter, 943 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 2334 mSolverCounterSat, 651 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 30.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 943 SdHoareTripleChecker+Valid, 607 SdHoareTripleChecker+Invalid, 2985 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 651 IncrementalHoareTripleChecker+Valid, 2334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 37.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:48,257 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [943 Valid, 607 Invalid, 2985 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [651 Valid, 2334 Invalid, 0 Unknown, 0 Unchecked, 37.1s Time] [2021-11-23 17:29:48,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1580 states. [2021-11-23 17:29:48,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1580 to 1580. [2021-11-23 17:29:48,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1580 states, 1578 states have (on average 1.641318124207858) internal successors, (2590), 1579 states have internal predecessors, (2590), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:48,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1580 states to 1580 states and 2590 transitions. [2021-11-23 17:29:48,411 INFO L78 Accepts]: Start accepts. Automaton has 1580 states and 2590 transitions. Word has length 16 [2021-11-23 17:29:48,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:48,412 INFO L470 AbstractCegarLoop]: Abstraction has 1580 states and 2590 transitions. [2021-11-23 17:29:48,412 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 2 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:48,413 INFO L276 IsEmpty]: Start isEmpty. Operand 1580 states and 2590 transitions. [2021-11-23 17:29:48,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 17:29:48,415 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:48,415 INFO L514 BasicCegarLoop]: 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] [2021-11-23 17:29:48,428 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2021-11-23 17:29:48,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:48,628 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:48,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:48,629 INFO L85 PathProgramCache]: Analyzing trace with hash 1951091139, now seen corresponding path program 1 times [2021-11-23 17:29:48,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:48,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1515355758] [2021-11-23 17:29:48,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:48,630 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:48,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:48,632 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:48,643 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:29:48,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:48,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:29:48,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:48,906 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:48,907 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:29:48,907 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:48,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1515355758] [2021-11-23 17:29:48,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1515355758] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:29:48,908 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:29:48,908 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:29:48,908 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184207672] [2021-11-23 17:29:48,908 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:29:48,910 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:29:48,910 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:48,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:29:48,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:29:48,911 INFO L87 Difference]: Start difference. First operand 1580 states and 2590 transitions. Second operand has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:49,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:49,039 INFO L93 Difference]: Finished difference Result 1630 states and 2666 transitions. [2021-11-23 17:29:49,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:29:49,040 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-23 17:29:49,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:49,051 INFO L225 Difference]: With dead ends: 1630 [2021-11-23 17:29:49,051 INFO L226 Difference]: Without dead ends: 1580 [2021-11-23 17:29:49,052 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:29:49,054 INFO L933 BasicCegarLoop]: 1561 mSDtfsCounter, 3 mSDsluCounter, 4657 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 6218 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:49,055 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 6218 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:29:49,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1580 states. [2021-11-23 17:29:49,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1580 to 1580. [2021-11-23 17:29:49,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1580 states, 1578 states have (on average 1.626742712294043) internal successors, (2567), 1579 states have internal predecessors, (2567), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:49,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1580 states to 1580 states and 2567 transitions. [2021-11-23 17:29:49,106 INFO L78 Accepts]: Start accepts. Automaton has 1580 states and 2567 transitions. Word has length 30 [2021-11-23 17:29:49,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:49,106 INFO L470 AbstractCegarLoop]: Abstraction has 1580 states and 2567 transitions. [2021-11-23 17:29:49,106 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:49,107 INFO L276 IsEmpty]: Start isEmpty. Operand 1580 states and 2567 transitions. [2021-11-23 17:29:49,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 17:29:49,109 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:49,110 INFO L514 BasicCegarLoop]: 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] [2021-11-23 17:29:49,129 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:49,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:49,329 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:49,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:49,330 INFO L85 PathProgramCache]: Analyzing trace with hash 568524862, now seen corresponding path program 1 times [2021-11-23 17:29:49,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:49,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1964931584] [2021-11-23 17:29:49,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:49,331 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:49,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:49,333 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:49,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:29:49,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:49,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:29:49,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:50,463 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:50,463 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:29:50,463 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:50,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1964931584] [2021-11-23 17:29:50,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1964931584] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:29:50,464 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:29:50,465 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:29:50,465 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843591491] [2021-11-23 17:29:50,465 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:29:50,466 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:29:50,466 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:50,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:29:50,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:29:50,468 INFO L87 Difference]: Start difference. First operand 1580 states and 2567 transitions. Second operand has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 6 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:50,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:50,735 INFO L93 Difference]: Finished difference Result 1810 states and 2927 transitions. [2021-11-23 17:29:50,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:29:50,736 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 6 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-23 17:29:50,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:50,749 INFO L225 Difference]: With dead ends: 1810 [2021-11-23 17:29:50,749 INFO L226 Difference]: Without dead ends: 1764 [2021-11-23 17:29:50,751 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:29:50,752 INFO L933 BasicCegarLoop]: 1534 mSDtfsCounter, 4852 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4852 SdHoareTripleChecker+Valid, 1814 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:50,753 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4852 Valid, 1814 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 17:29:50,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1764 states. [2021-11-23 17:29:50,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1764 to 1668. [2021-11-23 17:29:50,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1668 states, 1666 states have (on average 1.624249699879952) internal successors, (2706), 1667 states have internal predecessors, (2706), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:50,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1668 states to 1668 states and 2706 transitions. [2021-11-23 17:29:50,809 INFO L78 Accepts]: Start accepts. Automaton has 1668 states and 2706 transitions. Word has length 52 [2021-11-23 17:29:50,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:50,809 INFO L470 AbstractCegarLoop]: Abstraction has 1668 states and 2706 transitions. [2021-11-23 17:29:50,810 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 6 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:50,810 INFO L276 IsEmpty]: Start isEmpty. Operand 1668 states and 2706 transitions. [2021-11-23 17:29:50,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 17:29:50,813 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:50,813 INFO L514 BasicCegarLoop]: 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] [2021-11-23 17:29:50,834 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:51,034 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:51,035 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:51,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:51,036 INFO L85 PathProgramCache]: Analyzing trace with hash -524152242, now seen corresponding path program 1 times [2021-11-23 17:29:51,037 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:51,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1928281280] [2021-11-23 17:29:51,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:51,037 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:51,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:51,039 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:51,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:29:51,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:51,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:29:51,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:51,421 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:51,421 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:29:51,422 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:51,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1928281280] [2021-11-23 17:29:51,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1928281280] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:29:51,422 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:29:51,423 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:29:51,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527911836] [2021-11-23 17:29:51,423 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:29:51,424 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:29:51,424 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:51,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:29:51,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:29:51,425 INFO L87 Difference]: Start difference. First operand 1668 states and 2706 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:51,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:51,506 INFO L93 Difference]: Finished difference Result 1920 states and 3100 transitions. [2021-11-23 17:29:51,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:29:51,507 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-23 17:29:51,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:51,520 INFO L225 Difference]: With dead ends: 1920 [2021-11-23 17:29:51,520 INFO L226 Difference]: Without dead ends: 1786 [2021-11-23 17:29:51,522 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:29:51,523 INFO L933 BasicCegarLoop]: 1536 mSDtfsCounter, 1480 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1480 SdHoareTripleChecker+Valid, 1601 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:51,524 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1480 Valid, 1601 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:29:51,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1786 states. [2021-11-23 17:29:51,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1786 to 1781. [2021-11-23 17:29:51,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1781 states, 1779 states have (on average 1.6172006745362564) internal successors, (2877), 1780 states have internal predecessors, (2877), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:51,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1781 states to 1781 states and 2877 transitions. [2021-11-23 17:29:51,585 INFO L78 Accepts]: Start accepts. Automaton has 1781 states and 2877 transitions. Word has length 54 [2021-11-23 17:29:51,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:51,586 INFO L470 AbstractCegarLoop]: Abstraction has 1781 states and 2877 transitions. [2021-11-23 17:29:51,586 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:51,586 INFO L276 IsEmpty]: Start isEmpty. Operand 1781 states and 2877 transitions. [2021-11-23 17:29:51,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 17:29:51,589 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:51,589 INFO L514 BasicCegarLoop]: 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] [2021-11-23 17:29:51,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:51,802 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:51,802 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:51,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:51,803 INFO L85 PathProgramCache]: Analyzing trace with hash 1331255346, now seen corresponding path program 1 times [2021-11-23 17:29:51,803 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:51,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1377751305] [2021-11-23 17:29:51,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:51,804 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:51,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:51,806 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:51,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:29:51,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:51,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:29:51,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:52,104 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:52,105 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:29:52,105 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:52,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1377751305] [2021-11-23 17:29:52,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1377751305] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:29:52,106 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:29:52,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:29:52,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357401996] [2021-11-23 17:29:52,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:29:52,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:29:52,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:52,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:29:52,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:29:52,108 INFO L87 Difference]: Start difference. First operand 1781 states and 2877 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:52,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:52,182 INFO L93 Difference]: Finished difference Result 2239 states and 3581 transitions. [2021-11-23 17:29:52,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:29:52,183 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-23 17:29:52,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:52,197 INFO L225 Difference]: With dead ends: 2239 [2021-11-23 17:29:52,197 INFO L226 Difference]: Without dead ends: 1992 [2021-11-23 17:29:52,199 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:29:52,200 INFO L933 BasicCegarLoop]: 1557 mSDtfsCounter, 1489 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1489 SdHoareTripleChecker+Valid, 1639 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:52,200 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1489 Valid, 1639 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:29:52,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1992 states. [2021-11-23 17:29:52,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1992 to 1990. [2021-11-23 17:29:52,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1990 states, 1988 states have (on average 1.6056338028169015) internal successors, (3192), 1989 states have internal predecessors, (3192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:52,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1990 states to 1990 states and 3192 transitions. [2021-11-23 17:29:52,276 INFO L78 Accepts]: Start accepts. Automaton has 1990 states and 3192 transitions. Word has length 54 [2021-11-23 17:29:52,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:52,277 INFO L470 AbstractCegarLoop]: Abstraction has 1990 states and 3192 transitions. [2021-11-23 17:29:52,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:52,277 INFO L276 IsEmpty]: Start isEmpty. Operand 1990 states and 3192 transitions. [2021-11-23 17:29:52,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 17:29:52,279 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:52,279 INFO L514 BasicCegarLoop]: 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] [2021-11-23 17:29:52,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:52,493 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:52,493 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:52,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:52,494 INFO L85 PathProgramCache]: Analyzing trace with hash -1716204334, now seen corresponding path program 1 times [2021-11-23 17:29:52,494 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:52,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1414571159] [2021-11-23 17:29:52,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:52,495 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:52,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:52,496 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:52,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:29:52,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:52,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:29:52,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:52,784 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:52,784 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:29:52,784 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:52,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1414571159] [2021-11-23 17:29:52,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1414571159] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:29:52,785 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:29:52,785 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:29:52,785 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659851110] [2021-11-23 17:29:52,785 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:29:52,786 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:29:52,786 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:52,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:29:52,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:29:52,787 INFO L87 Difference]: Start difference. First operand 1990 states and 3192 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:52,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:52,877 INFO L93 Difference]: Finished difference Result 2830 states and 4466 transitions. [2021-11-23 17:29:52,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:29:52,878 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-23 17:29:52,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:52,895 INFO L225 Difference]: With dead ends: 2830 [2021-11-23 17:29:52,896 INFO L226 Difference]: Without dead ends: 2374 [2021-11-23 17:29:52,898 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:29:52,899 INFO L933 BasicCegarLoop]: 1570 mSDtfsCounter, 1493 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1493 SdHoareTripleChecker+Valid, 1648 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:52,899 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1493 Valid, 1648 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:29:52,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2374 states. [2021-11-23 17:29:52,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2374 to 2372. [2021-11-23 17:29:52,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2372 states, 2370 states have (on average 1.5848101265822785) internal successors, (3756), 2371 states have internal predecessors, (3756), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:53,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2372 states to 2372 states and 3756 transitions. [2021-11-23 17:29:53,008 INFO L78 Accepts]: Start accepts. Automaton has 2372 states and 3756 transitions. Word has length 54 [2021-11-23 17:29:53,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:53,009 INFO L470 AbstractCegarLoop]: Abstraction has 2372 states and 3756 transitions. [2021-11-23 17:29:53,009 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:53,009 INFO L276 IsEmpty]: Start isEmpty. Operand 2372 states and 3756 transitions. [2021-11-23 17:29:53,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 17:29:53,011 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:53,011 INFO L514 BasicCegarLoop]: 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] [2021-11-23 17:29:53,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:53,230 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:53,230 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:53,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:53,231 INFO L85 PathProgramCache]: Analyzing trace with hash -1442516622, now seen corresponding path program 1 times [2021-11-23 17:29:53,231 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:53,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1215358131] [2021-11-23 17:29:53,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:53,232 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:53,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:53,233 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:53,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:29:53,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:53,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:29:53,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:53,502 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:53,503 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:29:53,503 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:53,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1215358131] [2021-11-23 17:29:53,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1215358131] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:29:53,503 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:29:53,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:29:53,504 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863944234] [2021-11-23 17:29:53,504 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:29:53,504 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:29:53,504 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:53,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:29:53,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:29:53,505 INFO L87 Difference]: Start difference. First operand 2372 states and 3756 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:53,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:53,623 INFO L93 Difference]: Finished difference Result 3904 states and 6038 transitions. [2021-11-23 17:29:53,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:29:53,624 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-23 17:29:53,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:53,643 INFO L225 Difference]: With dead ends: 3904 [2021-11-23 17:29:53,643 INFO L226 Difference]: Without dead ends: 3066 [2021-11-23 17:29:53,645 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:29:53,646 INFO L933 BasicCegarLoop]: 1583 mSDtfsCounter, 1497 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1497 SdHoareTripleChecker+Valid, 1657 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:53,647 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1497 Valid, 1657 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:29:53,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3066 states. [2021-11-23 17:29:53,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3066 to 3064. [2021-11-23 17:29:53,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3064 states, 3062 states have (on average 1.5519268451992163) internal successors, (4752), 3063 states have internal predecessors, (4752), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:53,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3064 states to 3064 states and 4752 transitions. [2021-11-23 17:29:53,828 INFO L78 Accepts]: Start accepts. Automaton has 3064 states and 4752 transitions. Word has length 54 [2021-11-23 17:29:53,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:53,828 INFO L470 AbstractCegarLoop]: Abstraction has 3064 states and 4752 transitions. [2021-11-23 17:29:53,829 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:53,829 INFO L276 IsEmpty]: Start isEmpty. Operand 3064 states and 4752 transitions. [2021-11-23 17:29:53,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 17:29:53,830 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:53,830 INFO L514 BasicCegarLoop]: 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] [2021-11-23 17:29:53,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:54,043 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:54,044 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:54,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:54,045 INFO L85 PathProgramCache]: Analyzing trace with hash -1717241860, now seen corresponding path program 1 times [2021-11-23 17:29:54,045 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:54,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1059082308] [2021-11-23 17:29:54,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:54,046 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:54,046 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:54,047 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:54,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:29:54,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:54,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:29:54,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:54,286 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:54,286 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:29:54,287 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:54,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1059082308] [2021-11-23 17:29:54,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1059082308] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:29:54,287 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:29:54,287 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:29:54,287 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861860180] [2021-11-23 17:29:54,288 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:29:54,288 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:29:54,288 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:54,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:29:54,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:29:54,289 INFO L87 Difference]: Start difference. First operand 3064 states and 4752 transitions. Second operand has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:54,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:54,599 INFO L93 Difference]: Finished difference Result 4339 states and 6583 transitions. [2021-11-23 17:29:54,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:29:54,600 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-23 17:29:54,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:54,629 INFO L225 Difference]: With dead ends: 4339 [2021-11-23 17:29:54,629 INFO L226 Difference]: Without dead ends: 4337 [2021-11-23 17:29:54,632 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:29:54,633 INFO L933 BasicCegarLoop]: 1580 mSDtfsCounter, 186 mSDsluCounter, 4622 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 6202 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:54,633 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 6202 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:29:54,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4337 states. [2021-11-23 17:29:54,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4337 to 3160. [2021-11-23 17:29:54,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3160 states, 3158 states have (on average 1.532615579480684) internal successors, (4840), 3159 states have internal predecessors, (4840), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:54,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3160 states to 3160 states and 4840 transitions. [2021-11-23 17:29:54,818 INFO L78 Accepts]: Start accepts. Automaton has 3160 states and 4840 transitions. Word has length 55 [2021-11-23 17:29:54,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:54,819 INFO L470 AbstractCegarLoop]: Abstraction has 3160 states and 4840 transitions. [2021-11-23 17:29:54,820 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.0) internal successors, (55), 5 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:54,820 INFO L276 IsEmpty]: Start isEmpty. Operand 3160 states and 4840 transitions. [2021-11-23 17:29:54,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 17:29:54,821 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:54,821 INFO L514 BasicCegarLoop]: 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] [2021-11-23 17:29:54,836 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:55,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:55,037 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:55,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:55,038 INFO L85 PathProgramCache]: Analyzing trace with hash -754642547, now seen corresponding path program 1 times [2021-11-23 17:29:55,038 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:55,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1708734370] [2021-11-23 17:29:55,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:55,039 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:55,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:55,041 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:55,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:29:55,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:55,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:29:55,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:55,337 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:55,337 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:29:55,337 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:55,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1708734370] [2021-11-23 17:29:55,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1708734370] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:29:55,338 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:29:55,338 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:29:55,338 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370458314] [2021-11-23 17:29:55,338 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:29:55,338 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:29:55,339 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:55,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:29:55,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:29:55,339 INFO L87 Difference]: Start difference. First operand 3160 states and 4840 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:55,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:55,598 INFO L93 Difference]: Finished difference Result 4799 states and 7246 transitions. [2021-11-23 17:29:55,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:29:55,598 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-23 17:29:55,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:55,620 INFO L225 Difference]: With dead ends: 4799 [2021-11-23 17:29:55,621 INFO L226 Difference]: Without dead ends: 3884 [2021-11-23 17:29:55,623 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:29:55,626 INFO L933 BasicCegarLoop]: 1591 mSDtfsCounter, 1498 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1498 SdHoareTripleChecker+Valid, 1661 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:55,626 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1498 Valid, 1661 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:29:55,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3884 states. [2021-11-23 17:29:55,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3884 to 3882. [2021-11-23 17:29:55,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3882 states, 3880 states have (on average 1.5108247422680412) internal successors, (5862), 3881 states have internal predecessors, (5862), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:55,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3882 states to 3882 states and 5862 transitions. [2021-11-23 17:29:55,830 INFO L78 Accepts]: Start accepts. Automaton has 3882 states and 5862 transitions. Word has length 56 [2021-11-23 17:29:55,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:55,830 INFO L470 AbstractCegarLoop]: Abstraction has 3882 states and 5862 transitions. [2021-11-23 17:29:55,830 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:55,830 INFO L276 IsEmpty]: Start isEmpty. Operand 3882 states and 5862 transitions. [2021-11-23 17:29:55,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 17:29:55,832 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:55,833 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1] [2021-11-23 17:29:55,849 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:56,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:56,045 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:56,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:56,046 INFO L85 PathProgramCache]: Analyzing trace with hash 457839235, now seen corresponding path program 1 times [2021-11-23 17:29:56,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:56,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [592134216] [2021-11-23 17:29:56,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:56,047 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:56,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:56,048 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:56,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:29:56,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:56,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:29:56,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:56,359 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:56,359 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:29:56,359 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:56,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [592134216] [2021-11-23 17:29:56,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [592134216] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:29:56,360 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:29:56,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:29:56,360 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882054131] [2021-11-23 17:29:56,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:29:56,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:29:56,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:56,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:29:56,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:29:56,362 INFO L87 Difference]: Start difference. First operand 3882 states and 5862 transitions. Second operand has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:56,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:56,520 INFO L93 Difference]: Finished difference Result 5544 states and 8271 transitions. [2021-11-23 17:29:56,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:29:56,521 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-23 17:29:56,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:56,549 INFO L225 Difference]: With dead ends: 5544 [2021-11-23 17:29:56,556 INFO L226 Difference]: Without dead ends: 3198 [2021-11-23 17:29:56,560 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:29:56,561 INFO L933 BasicCegarLoop]: 1572 mSDtfsCounter, 45 mSDsluCounter, 1524 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 3096 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:56,561 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 3096 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:29:56,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3198 states. [2021-11-23 17:29:56,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3198 to 3196. [2021-11-23 17:29:56,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3196 states, 3194 states have (on average 1.527864746399499) internal successors, (4880), 3195 states have internal predecessors, (4880), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:56,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3196 states to 3196 states and 4880 transitions. [2021-11-23 17:29:56,815 INFO L78 Accepts]: Start accepts. Automaton has 3196 states and 4880 transitions. Word has length 79 [2021-11-23 17:29:56,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:56,815 INFO L470 AbstractCegarLoop]: Abstraction has 3196 states and 4880 transitions. [2021-11-23 17:29:56,816 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:29:56,816 INFO L276 IsEmpty]: Start isEmpty. Operand 3196 states and 4880 transitions. [2021-11-23 17:29:56,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:29:56,823 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:56,824 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:29:56,843 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:57,036 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:57,037 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:57,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:57,037 INFO L85 PathProgramCache]: Analyzing trace with hash -1280354104, now seen corresponding path program 1 times [2021-11-23 17:29:57,038 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:57,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1482192505] [2021-11-23 17:29:57,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:57,039 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:57,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:57,040 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:57,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 17:29:57,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:57,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:29:57,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:58,683 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:58,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:59,806 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:59,807 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:59,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1482192505] [2021-11-23 17:29:59,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1482192505] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:59,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [194325875] [2021-11-23 17:29:59,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:59,808 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:29:59,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:29:59,813 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:29:59,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-23 17:29:59,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:59,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:29:59,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:00,188 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:00,189 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:00,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [194325875] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:00,189 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:30:00,189 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:30:00,190 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722885844] [2021-11-23 17:30:00,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:00,190 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:30:00,190 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:00,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:30:00,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:30:00,191 INFO L87 Difference]: Start difference. First operand 3196 states and 4880 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:00,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:00,302 INFO L93 Difference]: Finished difference Result 4016 states and 6058 transitions. [2021-11-23 17:30:00,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:30:00,302 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-23 17:30:00,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:00,309 INFO L225 Difference]: With dead ends: 4016 [2021-11-23 17:30:00,309 INFO L226 Difference]: Without dead ends: 2382 [2021-11-23 17:30:00,312 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 225 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:30:00,313 INFO L933 BasicCegarLoop]: 1565 mSDtfsCounter, 39 mSDsluCounter, 1516 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 3081 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:00,314 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 3081 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:30:00,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2382 states. [2021-11-23 17:30:00,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2382 to 2380. [2021-11-23 17:30:00,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2380 states, 2378 states have (on average 1.552565180824222) internal successors, (3692), 2379 states have internal predecessors, (3692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:00,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2380 states to 2380 states and 3692 transitions. [2021-11-23 17:30:00,438 INFO L78 Accepts]: Start accepts. Automaton has 2380 states and 3692 transitions. Word has length 81 [2021-11-23 17:30:00,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:00,439 INFO L470 AbstractCegarLoop]: Abstraction has 2380 states and 3692 transitions. [2021-11-23 17:30:00,439 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:00,439 INFO L276 IsEmpty]: Start isEmpty. Operand 2380 states and 3692 transitions. [2021-11-23 17:30:00,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:30:00,440 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:00,441 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:00,446 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:00,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:00,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:00,852 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:00,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:00,852 INFO L85 PathProgramCache]: Analyzing trace with hash 240841224, now seen corresponding path program 1 times [2021-11-23 17:30:00,853 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:00,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1413829328] [2021-11-23 17:30:00,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:00,853 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:00,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:00,855 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:00,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 17:30:00,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:00,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:00,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:02,391 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:02,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:03,492 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:03,492 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:03,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1413829328] [2021-11-23 17:30:03,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1413829328] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:03,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1227508661] [2021-11-23 17:30:03,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:03,493 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:03,493 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:03,498 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:03,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-23 17:30:03,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:03,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:30:03,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:03,851 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:03,851 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:03,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1227508661] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:03,852 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:30:03,852 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:30:03,852 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563837531] [2021-11-23 17:30:03,852 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:03,853 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:30:03,853 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:03,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:30:03,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:30:03,854 INFO L87 Difference]: Start difference. First operand 2380 states and 3692 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:03,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:03,918 INFO L93 Difference]: Finished difference Result 2792 states and 4276 transitions. [2021-11-23 17:30:03,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:30:03,919 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-23 17:30:03,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:03,923 INFO L225 Difference]: With dead ends: 2792 [2021-11-23 17:30:03,923 INFO L226 Difference]: Without dead ends: 1974 [2021-11-23 17:30:03,925 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 225 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:30:03,927 INFO L933 BasicCegarLoop]: 1558 mSDtfsCounter, 33 mSDsluCounter, 1508 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 3066 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:03,927 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 3066 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:30:03,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1974 states. [2021-11-23 17:30:03,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1974 to 1972. [2021-11-23 17:30:03,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1972 states, 1970 states have (on average 1.5756345177664974) internal successors, (3104), 1971 states have internal predecessors, (3104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:03,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1972 states to 1972 states and 3104 transitions. [2021-11-23 17:30:03,992 INFO L78 Accepts]: Start accepts. Automaton has 1972 states and 3104 transitions. Word has length 81 [2021-11-23 17:30:03,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:03,993 INFO L470 AbstractCegarLoop]: Abstraction has 1972 states and 3104 transitions. [2021-11-23 17:30:03,993 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:03,993 INFO L276 IsEmpty]: Start isEmpty. Operand 1972 states and 3104 transitions. [2021-11-23 17:30:03,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:30:03,995 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:03,995 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:04,008 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Ended with exit code 0 [2021-11-23 17:30:04,214 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:04,407 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:04,408 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:04,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:04,408 INFO L85 PathProgramCache]: Analyzing trace with hash -96951918, now seen corresponding path program 1 times [2021-11-23 17:30:04,409 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:04,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [283419987] [2021-11-23 17:30:04,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:04,409 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:04,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:04,411 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:04,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 17:30:04,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:04,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:04,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:06,007 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:06,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:06,979 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:06,979 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:06,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [283419987] [2021-11-23 17:30:06,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [283419987] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:06,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1582279998] [2021-11-23 17:30:06,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:06,980 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:06,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:06,985 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:06,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-23 17:30:07,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:07,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:30:07,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:07,337 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:07,337 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:07,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1582279998] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:07,338 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:30:07,338 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:30:07,338 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136840031] [2021-11-23 17:30:07,338 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:07,339 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:30:07,339 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:07,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:30:07,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:30:07,340 INFO L87 Difference]: Start difference. First operand 1972 states and 3104 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:07,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:07,388 INFO L93 Difference]: Finished difference Result 2180 states and 3394 transitions. [2021-11-23 17:30:07,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:30:07,388 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-23 17:30:07,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:07,392 INFO L225 Difference]: With dead ends: 2180 [2021-11-23 17:30:07,393 INFO L226 Difference]: Without dead ends: 1770 [2021-11-23 17:30:07,394 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 225 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:30:07,395 INFO L933 BasicCegarLoop]: 1551 mSDtfsCounter, 29 mSDsluCounter, 1500 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 3051 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:07,396 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 3051 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:30:07,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1770 states. [2021-11-23 17:30:07,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1770 to 1768. [2021-11-23 17:30:07,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1768 states, 1766 states have (on average 1.5928652321630805) internal successors, (2813), 1767 states have internal predecessors, (2813), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:07,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1768 states to 1768 states and 2813 transitions. [2021-11-23 17:30:07,444 INFO L78 Accepts]: Start accepts. Automaton has 1768 states and 2813 transitions. Word has length 81 [2021-11-23 17:30:07,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:07,445 INFO L470 AbstractCegarLoop]: Abstraction has 1768 states and 2813 transitions. [2021-11-23 17:30:07,445 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:07,445 INFO L276 IsEmpty]: Start isEmpty. Operand 1768 states and 2813 transitions. [2021-11-23 17:30:07,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:30:07,446 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:07,447 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:07,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:07,665 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:07,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:07,860 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:07,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:07,861 INFO L85 PathProgramCache]: Analyzing trace with hash -1314937316, now seen corresponding path program 1 times [2021-11-23 17:30:07,861 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:07,861 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1226818181] [2021-11-23 17:30:07,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:07,862 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:07,862 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:07,863 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:07,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 17:30:07,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:07,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:07,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:09,306 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:09,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:10,428 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:10,429 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:10,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1226818181] [2021-11-23 17:30:10,429 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1226818181] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:10,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1977557156] [2021-11-23 17:30:10,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:10,429 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:10,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:10,434 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:10,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-23 17:30:10,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:10,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:10,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:11,703 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:11,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:12,453 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:12,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1977557156] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:12,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1323003162] [2021-11-23 17:30:12,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:12,454 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:12,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:12,465 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:12,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 17:30:12,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:12,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:12,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:13,477 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:13,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:14,147 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:14,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1323003162] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:14,147 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:14,148 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:30:14,148 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086122236] [2021-11-23 17:30:14,148 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:14,149 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:30:14,149 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:14,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:30:14,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:30:14,150 INFO L87 Difference]: Start difference. First operand 1768 states and 2813 transitions. Second operand has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:14,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:14,620 INFO L93 Difference]: Finished difference Result 2001 states and 3130 transitions. [2021-11-23 17:30:14,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:30:14,621 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-23 17:30:14,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:14,625 INFO L225 Difference]: With dead ends: 2001 [2021-11-23 17:30:14,625 INFO L226 Difference]: Without dead ends: 1795 [2021-11-23 17:30:14,626 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 466 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:30:14,627 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 4369 mSDsluCounter, 10621 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4369 SdHoareTripleChecker+Valid, 12142 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 53 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:14,627 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4369 Valid, 12142 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 71 Invalid, 0 Unknown, 53 Unchecked, 0.1s Time] [2021-11-23 17:30:14,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1795 states. [2021-11-23 17:30:14,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1795 to 1795. [2021-11-23 17:30:14,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1795 states, 1793 states have (on average 1.5856107083100948) internal successors, (2843), 1794 states have internal predecessors, (2843), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:14,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1795 states to 1795 states and 2843 transitions. [2021-11-23 17:30:14,673 INFO L78 Accepts]: Start accepts. Automaton has 1795 states and 2843 transitions. Word has length 81 [2021-11-23 17:30:14,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:14,674 INFO L470 AbstractCegarLoop]: Abstraction has 1795 states and 2843 transitions. [2021-11-23 17:30:14,674 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.8125) internal successors, (141), 15 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:14,674 INFO L276 IsEmpty]: Start isEmpty. Operand 1795 states and 2843 transitions. [2021-11-23 17:30:14,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:30:14,675 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:14,675 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:14,713 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:14,895 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:15,106 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:15,289 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:15,290 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:15,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:15,290 INFO L85 PathProgramCache]: Analyzing trace with hash 1744570940, now seen corresponding path program 1 times [2021-11-23 17:30:15,291 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:15,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2124025725] [2021-11-23 17:30:15,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:15,291 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:15,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:15,293 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:15,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 17:30:15,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:15,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:15,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:16,960 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:16,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:17,492 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:17,493 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:17,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2124025725] [2021-11-23 17:30:17,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2124025725] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:17,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [229630186] [2021-11-23 17:30:17,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:17,494 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:17,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:17,498 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:17,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-23 17:30:17,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:17,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:17,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:19,076 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:19,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:19,560 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:19,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [229630186] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:19,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569169998] [2021-11-23 17:30:19,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:19,561 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:19,561 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:19,566 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:19,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 17:30:19,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:19,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:19,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:21,130 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:21,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:21,588 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:21,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [569169998] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:21,588 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:21,589 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:30:21,589 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721086532] [2021-11-23 17:30:21,589 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:21,590 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:30:21,590 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:21,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:30:21,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:30:21,591 INFO L87 Difference]: Start difference. First operand 1795 states and 2843 transitions. Second operand has 16 states, 16 states have (on average 9.1875) internal successors, (147), 15 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:21,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:21,988 INFO L93 Difference]: Finished difference Result 2025 states and 3161 transitions. [2021-11-23 17:30:21,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:30:21,988 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.1875) internal successors, (147), 15 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-23 17:30:21,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:21,993 INFO L225 Difference]: With dead ends: 2025 [2021-11-23 17:30:21,993 INFO L226 Difference]: Without dead ends: 1819 [2021-11-23 17:30:21,996 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 466 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:30:21,996 INFO L933 BasicCegarLoop]: 1520 mSDtfsCounter, 5884 mSDsluCounter, 10617 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5884 SdHoareTripleChecker+Valid, 12137 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 141 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:21,997 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5884 Valid, 12137 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 90 Invalid, 0 Unknown, 141 Unchecked, 0.1s Time] [2021-11-23 17:30:22,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1819 states. [2021-11-23 17:30:22,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1819 to 1805. [2021-11-23 17:30:22,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1805 states, 1803 states have (on average 1.5834719911259012) internal successors, (2855), 1804 states have internal predecessors, (2855), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:22,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1805 states to 1805 states and 2855 transitions. [2021-11-23 17:30:22,045 INFO L78 Accepts]: Start accepts. Automaton has 1805 states and 2855 transitions. Word has length 81 [2021-11-23 17:30:22,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:22,045 INFO L470 AbstractCegarLoop]: Abstraction has 1805 states and 2855 transitions. [2021-11-23 17:30:22,046 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.1875) internal successors, (147), 15 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:22,046 INFO L276 IsEmpty]: Start isEmpty. Operand 1805 states and 2855 transitions. [2021-11-23 17:30:22,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:30:22,047 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:22,047 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:22,064 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:22,261 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:22,480 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:22,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:22,660 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:22,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:22,660 INFO L85 PathProgramCache]: Analyzing trace with hash -655405794, now seen corresponding path program 1 times [2021-11-23 17:30:22,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:22,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [31704426] [2021-11-23 17:30:22,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:22,661 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:22,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:22,663 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:22,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:30:22,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:22,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:22,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:23,272 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:30:23,272 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:23,272 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:23,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [31704426] [2021-11-23 17:30:23,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [31704426] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:23,273 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:23,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:30:23,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237134492] [2021-11-23 17:30:23,273 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:23,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:30:23,273 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:23,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:30:23,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:30:23,274 INFO L87 Difference]: Start difference. First operand 1805 states and 2855 transitions. Second operand has 6 states, 6 states have (on average 13.0) internal successors, (78), 5 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:23,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:23,406 INFO L93 Difference]: Finished difference Result 2024 states and 3154 transitions. [2021-11-23 17:30:23,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:30:23,407 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 5 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-23 17:30:23,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:23,410 INFO L225 Difference]: With dead ends: 2024 [2021-11-23 17:30:23,411 INFO L226 Difference]: Without dead ends: 1805 [2021-11-23 17:30:23,412 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:30:23,413 INFO L933 BasicCegarLoop]: 1526 mSDtfsCounter, 1458 mSDsluCounter, 1616 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1458 SdHoareTripleChecker+Valid, 3142 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:23,413 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1458 Valid, 3142 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 33 Unchecked, 0.1s Time] [2021-11-23 17:30:23,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1805 states. [2021-11-23 17:30:23,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1805 to 1805. [2021-11-23 17:30:23,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1805 states, 1803 states have (on average 1.5829173599556294) internal successors, (2854), 1804 states have internal predecessors, (2854), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:23,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1805 states to 1805 states and 2854 transitions. [2021-11-23 17:30:23,459 INFO L78 Accepts]: Start accepts. Automaton has 1805 states and 2854 transitions. Word has length 81 [2021-11-23 17:30:23,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:23,460 INFO L470 AbstractCegarLoop]: Abstraction has 1805 states and 2854 transitions. [2021-11-23 17:30:23,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 5 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:23,460 INFO L276 IsEmpty]: Start isEmpty. Operand 1805 states and 2854 transitions. [2021-11-23 17:30:23,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:30:23,461 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:23,462 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:23,478 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:23,674 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:23,675 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:23,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:23,675 INFO L85 PathProgramCache]: Analyzing trace with hash -891290594, now seen corresponding path program 1 times [2021-11-23 17:30:23,675 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:23,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1518105660] [2021-11-23 17:30:23,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:23,676 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:23,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:23,676 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:23,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 17:30:23,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:23,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:23,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:24,368 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:30:24,368 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:24,368 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:24,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1518105660] [2021-11-23 17:30:24,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1518105660] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:24,368 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:24,369 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:30:24,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682099816] [2021-11-23 17:30:24,369 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:24,369 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:30:24,369 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:24,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:30:24,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:30:24,370 INFO L87 Difference]: Start difference. First operand 1805 states and 2854 transitions. Second operand has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 5 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:24,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:24,517 INFO L93 Difference]: Finished difference Result 2028 states and 3158 transitions. [2021-11-23 17:30:24,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:30:24,517 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 5 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-23 17:30:24,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:24,521 INFO L225 Difference]: With dead ends: 2028 [2021-11-23 17:30:24,521 INFO L226 Difference]: Without dead ends: 1805 [2021-11-23 17:30:24,523 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:30:24,524 INFO L933 BasicCegarLoop]: 1529 mSDtfsCounter, 1460 mSDsluCounter, 1613 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1460 SdHoareTripleChecker+Valid, 3142 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:24,524 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1460 Valid, 3142 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 33 Unchecked, 0.1s Time] [2021-11-23 17:30:24,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1805 states. [2021-11-23 17:30:24,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1805 to 1805. [2021-11-23 17:30:24,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1805 states, 1803 states have (on average 1.5823627287853577) internal successors, (2853), 1804 states have internal predecessors, (2853), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:24,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1805 states to 1805 states and 2853 transitions. [2021-11-23 17:30:24,571 INFO L78 Accepts]: Start accepts. Automaton has 1805 states and 2853 transitions. Word has length 81 [2021-11-23 17:30:24,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:24,571 INFO L470 AbstractCegarLoop]: Abstraction has 1805 states and 2853 transitions. [2021-11-23 17:30:24,572 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 5 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:24,572 INFO L276 IsEmpty]: Start isEmpty. Operand 1805 states and 2853 transitions. [2021-11-23 17:30:24,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:30:24,573 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:24,573 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:24,590 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:24,785 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:24,786 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:24,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:24,786 INFO L85 PathProgramCache]: Analyzing trace with hash -421450978, now seen corresponding path program 1 times [2021-11-23 17:30:24,787 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:24,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1627700776] [2021-11-23 17:30:24,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:24,787 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:24,788 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:24,788 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:24,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 17:30:24,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:24,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:24,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:25,532 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:30:25,532 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:25,533 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:25,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1627700776] [2021-11-23 17:30:25,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1627700776] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:25,533 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:25,534 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:30:25,534 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65494166] [2021-11-23 17:30:25,534 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:25,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:30:25,535 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:25,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:30:25,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:30:25,536 INFO L87 Difference]: Start difference. First operand 1805 states and 2853 transitions. Second operand has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 5 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:25,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:25,701 INFO L93 Difference]: Finished difference Result 2032 states and 3162 transitions. [2021-11-23 17:30:25,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:30:25,702 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 5 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-23 17:30:25,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:25,706 INFO L225 Difference]: With dead ends: 2032 [2021-11-23 17:30:25,706 INFO L226 Difference]: Without dead ends: 1805 [2021-11-23 17:30:25,708 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:30:25,709 INFO L933 BasicCegarLoop]: 1532 mSDtfsCounter, 1465 mSDsluCounter, 1564 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1465 SdHoareTripleChecker+Valid, 3096 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 12 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:25,709 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1465 Valid, 3096 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 46 Invalid, 0 Unknown, 12 Unchecked, 0.1s Time] [2021-11-23 17:30:25,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1805 states. [2021-11-23 17:30:25,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1805 to 1805. [2021-11-23 17:30:25,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1805 states, 1803 states have (on average 1.581808097615086) internal successors, (2852), 1804 states have internal predecessors, (2852), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:25,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1805 states to 1805 states and 2852 transitions. [2021-11-23 17:30:25,764 INFO L78 Accepts]: Start accepts. Automaton has 1805 states and 2852 transitions. Word has length 81 [2021-11-23 17:30:25,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:25,764 INFO L470 AbstractCegarLoop]: Abstraction has 1805 states and 2852 transitions. [2021-11-23 17:30:25,765 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 5 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:25,765 INFO L276 IsEmpty]: Start isEmpty. Operand 1805 states and 2852 transitions. [2021-11-23 17:30:25,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:30:25,766 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:25,767 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:25,785 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:25,981 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:25,981 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:25,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:25,982 INFO L85 PathProgramCache]: Analyzing trace with hash -1330456034, now seen corresponding path program 1 times [2021-11-23 17:30:25,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:25,982 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [481045773] [2021-11-23 17:30:25,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:25,983 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:25,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:25,984 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:26,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 17:30:26,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:26,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:26,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:26,650 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:30:26,651 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:26,651 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:26,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [481045773] [2021-11-23 17:30:26,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [481045773] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:26,651 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:26,651 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:30:26,651 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447551267] [2021-11-23 17:30:26,652 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:26,652 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:30:26,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:26,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:30:26,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:30:26,653 INFO L87 Difference]: Start difference. First operand 1805 states and 2852 transitions. Second operand has 6 states, 6 states have (on average 12.5) internal successors, (75), 5 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:26,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:26,793 INFO L93 Difference]: Finished difference Result 2011 states and 3138 transitions. [2021-11-23 17:30:26,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:30:26,794 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 5 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-23 17:30:26,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:26,798 INFO L225 Difference]: With dead ends: 2011 [2021-11-23 17:30:26,799 INFO L226 Difference]: Without dead ends: 1780 [2021-11-23 17:30:26,800 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:30:26,801 INFO L933 BasicCegarLoop]: 1535 mSDtfsCounter, 2917 mSDsluCounter, 2960 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2917 SdHoareTripleChecker+Valid, 4495 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:26,802 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2917 Valid, 4495 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 9 Unchecked, 0.1s Time] [2021-11-23 17:30:26,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1780 states. [2021-11-23 17:30:26,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1780 to 1780. [2021-11-23 17:30:26,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1780 states, 1778 states have (on average 1.5877390326209224) internal successors, (2823), 1779 states have internal predecessors, (2823), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:26,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1780 states to 1780 states and 2823 transitions. [2021-11-23 17:30:26,855 INFO L78 Accepts]: Start accepts. Automaton has 1780 states and 2823 transitions. Word has length 81 [2021-11-23 17:30:26,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:26,855 INFO L470 AbstractCegarLoop]: Abstraction has 1780 states and 2823 transitions. [2021-11-23 17:30:26,856 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 5 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:26,856 INFO L276 IsEmpty]: Start isEmpty. Operand 1780 states and 2823 transitions. [2021-11-23 17:30:26,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 17:30:26,857 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:26,857 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:26,882 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:27,071 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:27,071 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:27,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:27,072 INFO L85 PathProgramCache]: Analyzing trace with hash 1524871731, now seen corresponding path program 1 times [2021-11-23 17:30:27,072 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:27,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1521691526] [2021-11-23 17:30:27,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:27,072 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:27,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:27,073 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:27,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:30:27,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:27,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:27,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:28,827 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:28,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:29,532 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:29,533 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:29,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1521691526] [2021-11-23 17:30:29,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1521691526] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:29,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [857480382] [2021-11-23 17:30:29,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:29,534 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:29,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:29,535 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:29,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-23 17:30:29,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:29,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:29,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:31,227 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:31,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:31,712 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:31,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [857480382] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:31,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016106942] [2021-11-23 17:30:31,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:31,713 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:31,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:31,722 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:31,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-23 17:30:31,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:31,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:31,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:33,396 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:33,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:33,896 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:33,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016106942] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:33,896 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:33,897 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:30:33,897 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707338313] [2021-11-23 17:30:33,897 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:33,898 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:30:33,898 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:33,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:30:33,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:30:33,899 INFO L87 Difference]: Start difference. First operand 1780 states and 2823 transitions. Second operand has 16 states, 16 states have (on average 9.5625) internal successors, (153), 15 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:34,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:34,221 INFO L93 Difference]: Finished difference Result 1998 states and 3127 transitions. [2021-11-23 17:30:34,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:30:34,221 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.5625) internal successors, (153), 15 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-23 17:30:34,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:34,225 INFO L225 Difference]: With dead ends: 1998 [2021-11-23 17:30:34,226 INFO L226 Difference]: Without dead ends: 1792 [2021-11-23 17:30:34,227 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 472 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:30:34,228 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 5848 mSDsluCounter, 12181 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5848 SdHoareTripleChecker+Valid, 13702 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 94 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:34,228 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5848 Valid, 13702 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 74 Invalid, 0 Unknown, 94 Unchecked, 0.1s Time] [2021-11-23 17:30:34,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1792 states. [2021-11-23 17:30:34,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1792 to 1792. [2021-11-23 17:30:34,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1792 states, 1790 states have (on average 1.5860335195530726) internal successors, (2839), 1791 states have internal predecessors, (2839), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:34,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1792 states to 1792 states and 2839 transitions. [2021-11-23 17:30:34,280 INFO L78 Accepts]: Start accepts. Automaton has 1792 states and 2839 transitions. Word has length 82 [2021-11-23 17:30:34,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:34,281 INFO L470 AbstractCegarLoop]: Abstraction has 1792 states and 2839 transitions. [2021-11-23 17:30:34,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.5625) internal successors, (153), 15 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:34,281 INFO L276 IsEmpty]: Start isEmpty. Operand 1792 states and 2839 transitions. [2021-11-23 17:30:34,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:30:34,283 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:34,283 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:34,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:34,498 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:34,720 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:34,897 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:34,897 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:34,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:34,898 INFO L85 PathProgramCache]: Analyzing trace with hash -1294691885, now seen corresponding path program 1 times [2021-11-23 17:30:34,898 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:34,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1902848860] [2021-11-23 17:30:34,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:34,898 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:34,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:34,900 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:34,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 17:30:34,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:34,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:34,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:36,964 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:36,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:37,775 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:37,775 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:37,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1902848860] [2021-11-23 17:30:37,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1902848860] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:37,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [630490437] [2021-11-23 17:30:37,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:37,776 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:37,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:37,777 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:37,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-23 17:30:37,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:37,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:37,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:39,459 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:39,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:40,053 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:40,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [630490437] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:40,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909273590] [2021-11-23 17:30:40,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:40,054 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:40,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:40,062 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:40,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-23 17:30:40,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:40,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:30:40,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:41,881 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:41,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:42,445 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:42,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909273590] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:42,446 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:42,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:30:42,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594848163] [2021-11-23 17:30:42,446 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:42,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:30:42,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:42,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:30:42,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:30:42,448 INFO L87 Difference]: Start difference. First operand 1792 states and 2839 transitions. Second operand has 16 states, 16 states have (on average 9.9375) internal successors, (159), 15 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:42,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:42,758 INFO L93 Difference]: Finished difference Result 2010 states and 3143 transitions. [2021-11-23 17:30:42,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:30:42,759 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.9375) internal successors, (159), 15 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-23 17:30:42,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:42,764 INFO L225 Difference]: With dead ends: 2010 [2021-11-23 17:30:42,764 INFO L226 Difference]: Without dead ends: 1804 [2021-11-23 17:30:42,766 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 478 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:30:42,766 INFO L933 BasicCegarLoop]: 1519 mSDtfsCounter, 5850 mSDsluCounter, 7735 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5850 SdHoareTripleChecker+Valid, 9254 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 57 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:42,767 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5850 Valid, 9254 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 72 Invalid, 0 Unknown, 57 Unchecked, 0.1s Time] [2021-11-23 17:30:42,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1804 states. [2021-11-23 17:30:42,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1804 to 1804. [2021-11-23 17:30:42,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1804 states, 1802 states have (on average 1.5843507214206438) internal successors, (2855), 1803 states have internal predecessors, (2855), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:42,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1804 states to 1804 states and 2855 transitions. [2021-11-23 17:30:42,818 INFO L78 Accepts]: Start accepts. Automaton has 1804 states and 2855 transitions. Word has length 83 [2021-11-23 17:30:42,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:42,819 INFO L470 AbstractCegarLoop]: Abstraction has 1804 states and 2855 transitions. [2021-11-23 17:30:42,819 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.9375) internal successors, (159), 15 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:42,819 INFO L276 IsEmpty]: Start isEmpty. Operand 1804 states and 2855 transitions. [2021-11-23 17:30:42,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:30:42,820 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:42,820 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:42,839 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:43,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:43,254 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:43,434 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:43,434 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:43,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:43,434 INFO L85 PathProgramCache]: Analyzing trace with hash 1031414378, now seen corresponding path program 1 times [2021-11-23 17:30:43,434 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:43,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [491792000] [2021-11-23 17:30:43,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:43,435 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:43,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:43,436 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:43,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 17:30:43,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:43,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:43,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:44,400 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:30:44,400 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:44,400 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:44,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [491792000] [2021-11-23 17:30:44,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [491792000] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:44,400 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:44,400 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:30:44,400 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460474254] [2021-11-23 17:30:44,401 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:44,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:30:44,401 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:44,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:30:44,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:30:44,402 INFO L87 Difference]: Start difference. First operand 1804 states and 2855 transitions. Second operand has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:44,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:44,570 INFO L93 Difference]: Finished difference Result 2168 states and 3355 transitions. [2021-11-23 17:30:44,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:30:44,572 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2021-11-23 17:30:44,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:44,575 INFO L225 Difference]: With dead ends: 2168 [2021-11-23 17:30:44,576 INFO L226 Difference]: Without dead ends: 1962 [2021-11-23 17:30:44,577 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:30:44,577 INFO L933 BasicCegarLoop]: 1611 mSDtfsCounter, 4761 mSDsluCounter, 1733 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4761 SdHoareTripleChecker+Valid, 3344 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:44,578 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4761 Valid, 3344 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:30:44,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1962 states. [2021-11-23 17:30:44,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1962 to 1804. [2021-11-23 17:30:44,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1804 states, 1802 states have (on average 1.5810210876803552) internal successors, (2849), 1803 states have internal predecessors, (2849), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:44,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1804 states to 1804 states and 2849 transitions. [2021-11-23 17:30:44,625 INFO L78 Accepts]: Start accepts. Automaton has 1804 states and 2849 transitions. Word has length 84 [2021-11-23 17:30:44,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:44,626 INFO L470 AbstractCegarLoop]: Abstraction has 1804 states and 2849 transitions. [2021-11-23 17:30:44,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:44,626 INFO L276 IsEmpty]: Start isEmpty. Operand 1804 states and 2849 transitions. [2021-11-23 17:30:44,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:30:44,627 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:44,628 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:44,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:44,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:44,840 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:44,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:44,840 INFO L85 PathProgramCache]: Analyzing trace with hash -1761193811, now seen corresponding path program 1 times [2021-11-23 17:30:44,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:44,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1935791331] [2021-11-23 17:30:44,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:44,841 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:44,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:44,842 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:44,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 17:30:44,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:44,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:44,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:45,862 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:30:45,862 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:45,862 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:45,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1935791331] [2021-11-23 17:30:45,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1935791331] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:45,863 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:45,863 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:30:45,863 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80223749] [2021-11-23 17:30:45,863 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:45,863 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:30:45,863 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:45,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:30:45,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:30:45,864 INFO L87 Difference]: Start difference. First operand 1804 states and 2849 transitions. Second operand has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:46,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:46,052 INFO L93 Difference]: Finished difference Result 2100 states and 3258 transitions. [2021-11-23 17:30:46,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:30:46,053 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2021-11-23 17:30:46,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:46,057 INFO L225 Difference]: With dead ends: 2100 [2021-11-23 17:30:46,057 INFO L226 Difference]: Without dead ends: 2030 [2021-11-23 17:30:46,058 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:30:46,059 INFO L933 BasicCegarLoop]: 1618 mSDtfsCounter, 3187 mSDsluCounter, 1739 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3187 SdHoareTripleChecker+Valid, 3357 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:46,059 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3187 Valid, 3357 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:30:46,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2030 states. [2021-11-23 17:30:46,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2030 to 1876. [2021-11-23 17:30:46,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1876 states, 1874 states have (on average 1.5709711846318035) internal successors, (2944), 1875 states have internal predecessors, (2944), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:46,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1876 states to 1876 states and 2944 transitions. [2021-11-23 17:30:46,124 INFO L78 Accepts]: Start accepts. Automaton has 1876 states and 2944 transitions. Word has length 84 [2021-11-23 17:30:46,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:46,125 INFO L470 AbstractCegarLoop]: Abstraction has 1876 states and 2944 transitions. [2021-11-23 17:30:46,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:46,125 INFO L276 IsEmpty]: Start isEmpty. Operand 1876 states and 2944 transitions. [2021-11-23 17:30:46,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:30:46,127 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:46,127 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:46,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:46,339 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:46,339 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:46,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:46,340 INFO L85 PathProgramCache]: Analyzing trace with hash 1178309706, now seen corresponding path program 1 times [2021-11-23 17:30:46,340 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:46,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [731361849] [2021-11-23 17:30:46,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:46,341 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:46,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:46,342 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:46,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 17:30:46,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:46,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:46,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:47,325 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:30:47,325 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:47,325 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:47,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [731361849] [2021-11-23 17:30:47,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [731361849] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:47,326 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:47,326 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:30:47,326 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405181726] [2021-11-23 17:30:47,326 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:47,326 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:30:47,326 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:47,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:30:47,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:30:47,327 INFO L87 Difference]: Start difference. First operand 1876 states and 2944 transitions. Second operand has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:47,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:47,538 INFO L93 Difference]: Finished difference Result 2172 states and 3353 transitions. [2021-11-23 17:30:47,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:30:47,538 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2021-11-23 17:30:47,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:47,543 INFO L225 Difference]: With dead ends: 2172 [2021-11-23 17:30:47,543 INFO L226 Difference]: Without dead ends: 2102 [2021-11-23 17:30:47,544 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:30:47,545 INFO L933 BasicCegarLoop]: 1626 mSDtfsCounter, 3182 mSDsluCounter, 1805 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3182 SdHoareTripleChecker+Valid, 3431 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:47,545 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3182 Valid, 3431 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 17:30:47,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2102 states. [2021-11-23 17:30:47,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2102 to 1954. [2021-11-23 17:30:47,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1954 states, 1952 states have (on average 1.5609631147540983) internal successors, (3047), 1953 states have internal predecessors, (3047), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:47,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1954 states to 1954 states and 3047 transitions. [2021-11-23 17:30:47,603 INFO L78 Accepts]: Start accepts. Automaton has 1954 states and 3047 transitions. Word has length 84 [2021-11-23 17:30:47,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:47,603 INFO L470 AbstractCegarLoop]: Abstraction has 1954 states and 3047 transitions. [2021-11-23 17:30:47,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:47,604 INFO L276 IsEmpty]: Start isEmpty. Operand 1954 states and 3047 transitions. [2021-11-23 17:30:47,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:30:47,605 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:47,605 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:47,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:47,817 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:47,818 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:47,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:47,818 INFO L85 PathProgramCache]: Analyzing trace with hash 817957581, now seen corresponding path program 1 times [2021-11-23 17:30:47,818 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:47,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [171029475] [2021-11-23 17:30:47,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:47,819 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:47,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:47,819 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:47,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 17:30:47,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:47,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:30:47,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:48,838 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:30:48,838 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:30:48,839 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:48,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [171029475] [2021-11-23 17:30:48,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [171029475] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:30:48,839 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:30:48,839 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:30:48,839 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290102614] [2021-11-23 17:30:48,839 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:30:48,839 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:30:48,840 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:48,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:30:48,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:30:48,840 INFO L87 Difference]: Start difference. First operand 1954 states and 3047 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:49,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:49,001 INFO L93 Difference]: Finished difference Result 2250 states and 3456 transitions. [2021-11-23 17:30:49,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:30:49,002 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2021-11-23 17:30:49,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:49,007 INFO L225 Difference]: With dead ends: 2250 [2021-11-23 17:30:49,007 INFO L226 Difference]: Without dead ends: 2180 [2021-11-23 17:30:49,008 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:30:49,009 INFO L933 BasicCegarLoop]: 1614 mSDtfsCounter, 3236 mSDsluCounter, 1777 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3236 SdHoareTripleChecker+Valid, 3391 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:49,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3236 Valid, 3391 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:30:49,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2180 states. [2021-11-23 17:30:49,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2180 to 2032. [2021-11-23 17:30:49,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2032 states, 2030 states have (on average 1.5517241379310345) internal successors, (3150), 2031 states have internal predecessors, (3150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:49,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2032 states to 2032 states and 3150 transitions. [2021-11-23 17:30:49,072 INFO L78 Accepts]: Start accepts. Automaton has 2032 states and 3150 transitions. Word has length 84 [2021-11-23 17:30:49,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:49,073 INFO L470 AbstractCegarLoop]: Abstraction has 2032 states and 3150 transitions. [2021-11-23 17:30:49,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:30:49,073 INFO L276 IsEmpty]: Start isEmpty. Operand 2032 states and 3150 transitions. [2021-11-23 17:30:49,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:30:49,074 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:49,075 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:49,092 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:49,287 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:49,288 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:49,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:49,288 INFO L85 PathProgramCache]: Analyzing trace with hash -260780419, now seen corresponding path program 1 times [2021-11-23 17:30:49,289 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:49,289 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [102850532] [2021-11-23 17:30:49,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:49,289 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:49,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:49,290 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:49,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-23 17:30:49,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:49,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 17:30:49,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:55,653 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:55,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:59,975 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:59,975 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:59,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [102850532] [2021-11-23 17:30:59,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [102850532] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:59,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1542497055] [2021-11-23 17:30:59,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:59,976 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:59,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:59,982 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:59,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2021-11-23 17:31:00,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:00,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:31:00,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:04,871 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:04,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:06,849 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:06,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1542497055] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:06,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [128279967] [2021-11-23 17:31:06,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:06,850 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:06,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:06,851 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:06,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-23 17:31:06,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:06,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:31:06,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:17,217 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:17,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:19,819 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:19,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [128279967] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:19,819 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:19,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 24, 15, 15, 28, 25] total 94 [2021-11-23 17:31:19,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389857739] [2021-11-23 17:31:19,820 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:19,820 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2021-11-23 17:31:19,820 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:19,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-11-23 17:31:19,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1137, Invalid=7605, Unknown=0, NotChecked=0, Total=8742 [2021-11-23 17:31:19,824 INFO L87 Difference]: Start difference. First operand 2032 states and 3150 transitions. Second operand has 94 states, 94 states have (on average 3.6382978723404253) internal successors, (342), 94 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:23,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:23,892 INFO L93 Difference]: Finished difference Result 2361 states and 3571 transitions. [2021-11-23 17:31:23,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 17:31:23,892 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 3.6382978723404253) internal successors, (342), 94 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 17:31:23,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:23,894 INFO L225 Difference]: With dead ends: 2361 [2021-11-23 17:31:23,895 INFO L226 Difference]: Without dead ends: 2219 [2021-11-23 17:31:23,898 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 422 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4801 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=1489, Invalid=10283, Unknown=0, NotChecked=0, Total=11772 [2021-11-23 17:31:23,899 INFO L933 BasicCegarLoop]: 1538 mSDtfsCounter, 1750 mSDsluCounter, 54296 mSDsCounter, 0 mSdLazyCounter, 402 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1750 SdHoareTripleChecker+Valid, 55834 SdHoareTripleChecker+Invalid, 778 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 370 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:23,899 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1750 Valid, 55834 Invalid, 778 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [6 Valid, 402 Invalid, 0 Unknown, 370 Unchecked, 0.9s Time] [2021-11-23 17:31:23,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2219 states. [2021-11-23 17:31:23,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2219 to 2043. [2021-11-23 17:31:23,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2043 states, 2041 states have (on average 1.5497305242528172) internal successors, (3163), 2042 states have internal predecessors, (3163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:23,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2043 states to 2043 states and 3163 transitions. [2021-11-23 17:31:23,952 INFO L78 Accepts]: Start accepts. Automaton has 2043 states and 3163 transitions. Word has length 85 [2021-11-23 17:31:23,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:23,952 INFO L470 AbstractCegarLoop]: Abstraction has 2043 states and 3163 transitions. [2021-11-23 17:31:23,952 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 3.6382978723404253) internal successors, (342), 94 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:31:23,953 INFO L276 IsEmpty]: Start isEmpty. Operand 2043 states and 3163 transitions. [2021-11-23 17:31:23,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:31:23,954 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:23,954 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:31:23,967 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:24,187 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:24,368 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (39)] Ended with exit code 0 [2021-11-23 17:31:24,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:24,567 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:24,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:24,567 INFO L85 PathProgramCache]: Analyzing trace with hash 669515392, now seen corresponding path program 1 times [2021-11-23 17:31:24,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:24,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1598336805] [2021-11-23 17:31:24,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:24,568 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:24,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:24,569 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:24,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-23 17:31:24,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:24,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:31:24,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:26,549 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:26,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:27,103 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:27,104 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:27,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1598336805] [2021-11-23 17:31:27,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1598336805] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:27,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [855642114] [2021-11-23 17:31:27,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:27,104 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:27,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:27,105 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:27,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-11-23 17:31:27,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:27,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:31:27,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:37,808 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:37,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:44,188 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:44,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [855642114] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:44,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1560076202] [2021-11-23 17:31:44,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:44,189 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:44,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:44,189 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:44,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-23 17:31:44,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:44,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:31:44,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:54,488 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:54,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:55,962 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:55,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1560076202] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:55,963 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:55,963 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 29, 24, 28, 24] total 83 [2021-11-23 17:31:55,963 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031915063] [2021-11-23 17:31:55,963 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:55,964 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-23 17:31:55,964 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:55,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-23 17:31:55,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=681, Invalid=6125, Unknown=0, NotChecked=0, Total=6806 [2021-11-23 17:31:55,968 INFO L87 Difference]: Start difference. First operand 2043 states and 3163 transitions. Second operand has 83 states, 83 states have (on average 4.180722891566265) internal successors, (347), 83 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:02,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:02,002 INFO L93 Difference]: Finished difference Result 2396 states and 3608 transitions. [2021-11-23 17:32:02,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:32:02,002 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 4.180722891566265) internal successors, (347), 83 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 17:32:02,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:02,005 INFO L225 Difference]: With dead ends: 2396 [2021-11-23 17:32:02,005 INFO L226 Difference]: Without dead ends: 2244 [2021-11-23 17:32:02,009 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 532 GetRequests, 433 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2990 ImplicationChecksByTransitivity, 21.4s TimeCoverageRelationStatistics Valid=1019, Invalid=8881, Unknown=0, NotChecked=0, Total=9900 [2021-11-23 17:32:02,010 INFO L933 BasicCegarLoop]: 1541 mSDtfsCounter, 8910 mSDsluCounter, 40978 mSDsCounter, 0 mSdLazyCounter, 478 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8910 SdHoareTripleChecker+Valid, 42519 SdHoareTripleChecker+Invalid, 717 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 226 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:02,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8910 Valid, 42519 Invalid, 717 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [13 Valid, 478 Invalid, 0 Unknown, 226 Unchecked, 0.9s Time] [2021-11-23 17:32:02,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2244 states. [2021-11-23 17:32:02,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2244 to 2044. [2021-11-23 17:32:02,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2044 states, 2042 states have (on average 1.5494613124387855) internal successors, (3164), 2043 states have internal predecessors, (3164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:02,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2044 states to 2044 states and 3164 transitions. [2021-11-23 17:32:02,081 INFO L78 Accepts]: Start accepts. Automaton has 2044 states and 3164 transitions. Word has length 85 [2021-11-23 17:32:02,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:02,082 INFO L470 AbstractCegarLoop]: Abstraction has 2044 states and 3164 transitions. [2021-11-23 17:32:02,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 4.180722891566265) internal successors, (347), 83 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:02,082 INFO L276 IsEmpty]: Start isEmpty. Operand 2044 states and 3164 transitions. [2021-11-23 17:32:02,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:32:02,083 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:02,084 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:02,090 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (42)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:02,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:02,508 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:02,686 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:02,686 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:02,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:02,687 INFO L85 PathProgramCache]: Analyzing trace with hash -1911465891, now seen corresponding path program 1 times [2021-11-23 17:32:02,687 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:02,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1141725350] [2021-11-23 17:32:02,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:02,687 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:02,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:02,688 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:02,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-23 17:32:02,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:02,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:32:02,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:05,642 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:05,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:06,621 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:06,621 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:06,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1141725350] [2021-11-23 17:32:06,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1141725350] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:06,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [14562187] [2021-11-23 17:32:06,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:06,622 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:06,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:06,622 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:06,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (45)] Waiting until timeout for monitored process [2021-11-23 17:32:06,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:06,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:32:06,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:09,229 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:09,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:09,776 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:09,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [14562187] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:09,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411533109] [2021-11-23 17:32:09,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:09,777 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:09,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:09,778 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:09,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-23 17:32:09,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:09,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:32:09,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:16,761 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:16,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:21,046 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:21,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1411533109] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:21,047 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:21,047 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 17, 14, 25, 24] total 71 [2021-11-23 17:32:21,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768467784] [2021-11-23 17:32:21,048 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:21,048 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-23 17:32:21,048 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:21,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-23 17:32:21,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=793, Invalid=4177, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 17:32:21,051 INFO L87 Difference]: Start difference. First operand 2044 states and 3164 transitions. Second operand has 71 states, 71 states have (on average 3.816901408450704) internal successors, (271), 71 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:23,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:23,695 INFO L93 Difference]: Finished difference Result 2395 states and 3604 transitions. [2021-11-23 17:32:23,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 17:32:23,695 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.816901408450704) internal successors, (271), 71 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 17:32:23,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:23,698 INFO L225 Difference]: With dead ends: 2395 [2021-11-23 17:32:23,698 INFO L226 Difference]: Without dead ends: 2231 [2021-11-23 17:32:23,700 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 436 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2071 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=934, Invalid=4616, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 17:32:23,701 INFO L933 BasicCegarLoop]: 1542 mSDtfsCounter, 14624 mSDsluCounter, 20509 mSDsCounter, 0 mSdLazyCounter, 742 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14624 SdHoareTripleChecker+Valid, 22051 SdHoareTripleChecker+Invalid, 825 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 742 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:23,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14624 Valid, 22051 Invalid, 825 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [24 Valid, 742 Invalid, 0 Unknown, 59 Unchecked, 1.4s Time] [2021-11-23 17:32:23,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2231 states. [2021-11-23 17:32:23,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2231 to 2022. [2021-11-23 17:32:23,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2022 states, 2020 states have (on average 1.551980198019802) internal successors, (3135), 2021 states have internal predecessors, (3135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:23,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2022 states to 2022 states and 3135 transitions. [2021-11-23 17:32:23,767 INFO L78 Accepts]: Start accepts. Automaton has 2022 states and 3135 transitions. Word has length 85 [2021-11-23 17:32:23,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:23,767 INFO L470 AbstractCegarLoop]: Abstraction has 2022 states and 3135 transitions. [2021-11-23 17:32:23,768 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.816901408450704) internal successors, (271), 71 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:23,768 INFO L276 IsEmpty]: Start isEmpty. Operand 2022 states and 3135 transitions. [2021-11-23 17:32:23,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 17:32:23,770 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:23,770 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:23,809 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:23,994 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (45)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:24,198 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (44)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:24,389 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:32:24,389 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:24,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:24,390 INFO L85 PathProgramCache]: Analyzing trace with hash -737842279, now seen corresponding path program 1 times [2021-11-23 17:32:24,390 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:24,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1578948625] [2021-11-23 17:32:24,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:24,390 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:24,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:24,391 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:24,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-23 17:32:24,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:24,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:32:24,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:24,827 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:24,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:25,134 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:25,134 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:25,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1578948625] [2021-11-23 17:32:25,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1578948625] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:25,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [470895821] [2021-11-23 17:32:25,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:25,135 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:25,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:25,136 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:25,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2021-11-23 17:32:25,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:25,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:32:25,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:25,669 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:25,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:25,985 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:25,985 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [470895821] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:25,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [433461895] [2021-11-23 17:32:25,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:25,985 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:25,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:25,986 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:25,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-23 17:32:26,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:26,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:32:26,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:26,448 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:26,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:26,945 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:26,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [433461895] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:26,946 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:26,946 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 5] total 7 [2021-11-23 17:32:26,946 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141320391] [2021-11-23 17:32:26,946 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:26,947 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:32:26,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:26,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:32:26,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:32:26,948 INFO L87 Difference]: Start difference. First operand 2022 states and 3135 transitions. Second operand has 7 states, 7 states have (on average 29.857142857142858) internal successors, (209), 7 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:27,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:27,136 INFO L93 Difference]: Finished difference Result 3238 states and 4737 transitions. [2021-11-23 17:32:27,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 17:32:27,137 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 29.857142857142858) internal successors, (209), 7 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-23 17:32:27,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:27,141 INFO L225 Difference]: With dead ends: 3238 [2021-11-23 17:32:27,141 INFO L226 Difference]: Without dead ends: 2828 [2021-11-23 17:32:27,143 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 511 GetRequests, 502 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:32:27,144 INFO L933 BasicCegarLoop]: 1568 mSDtfsCounter, 4563 mSDsluCounter, 1952 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4563 SdHoareTripleChecker+Valid, 3520 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 22 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:27,144 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4563 Valid, 3520 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 41 Invalid, 0 Unknown, 22 Unchecked, 0.1s Time] [2021-11-23 17:32:27,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2828 states. [2021-11-23 17:32:27,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2828 to 2726. [2021-11-23 17:32:27,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2726 states, 2724 states have (on average 1.4831130690161527) internal successors, (4040), 2725 states have internal predecessors, (4040), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:27,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2726 states to 2726 states and 4040 transitions. [2021-11-23 17:32:27,250 INFO L78 Accepts]: Start accepts. Automaton has 2726 states and 4040 transitions. Word has length 86 [2021-11-23 17:32:27,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:27,251 INFO L470 AbstractCegarLoop]: Abstraction has 2726 states and 4040 transitions. [2021-11-23 17:32:27,251 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 29.857142857142858) internal successors, (209), 7 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:32:27,251 INFO L276 IsEmpty]: Start isEmpty. Operand 2726 states and 4040 transitions. [2021-11-23 17:32:27,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 17:32:27,252 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:27,252 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:27,265 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (47)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:27,453 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (48)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:27,672 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:27,853 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:27,853 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:27,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:27,853 INFO L85 PathProgramCache]: Analyzing trace with hash 1997534658, now seen corresponding path program 1 times [2021-11-23 17:32:27,854 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:27,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1119207720] [2021-11-23 17:32:27,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:27,854 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:27,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:27,855 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:27,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-23 17:32:27,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:27,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:32:27,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:40,467 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:40,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:49,163 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:49,164 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:49,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1119207720] [2021-11-23 17:32:49,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1119207720] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:49,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1858675268] [2021-11-23 17:32:49,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:49,165 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:49,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:49,168 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:49,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2021-11-23 17:32:49,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:49,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:32:49,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:03,901 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:03,902 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:07,317 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:07,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1858675268] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:07,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1091274612] [2021-11-23 17:33:07,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:07,317 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:07,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:07,323 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:07,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-23 17:33:07,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:07,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 17:33:07,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:12,415 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:12,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:13,964 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:13,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1091274612] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:13,964 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:13,964 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 22, 29, 24, 29, 24] total 68 [2021-11-23 17:33:13,965 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995915732] [2021-11-23 17:33:13,965 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:13,965 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-23 17:33:13,965 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:13,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-23 17:33:13,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=521, Invalid=4035, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 17:33:13,968 INFO L87 Difference]: Start difference. First operand 2726 states and 4040 transitions. Second operand has 68 states, 68 states have (on average 3.2058823529411766) internal successors, (218), 68 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:15,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:15,758 INFO L93 Difference]: Finished difference Result 3128 states and 4558 transitions. [2021-11-23 17:33:15,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 17:33:15,758 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.2058823529411766) internal successors, (218), 68 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-23 17:33:15,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:15,760 INFO L225 Difference]: With dead ends: 3128 [2021-11-23 17:33:15,761 INFO L226 Difference]: Without dead ends: 2768 [2021-11-23 17:33:15,763 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 444 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1732 ImplicationChecksByTransitivity, 27.7s TimeCoverageRelationStatistics Valid=561, Invalid=4269, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 17:33:15,764 INFO L933 BasicCegarLoop]: 1508 mSDtfsCounter, 5982 mSDsluCounter, 27355 mSDsCounter, 0 mSdLazyCounter, 368 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5982 SdHoareTripleChecker+Valid, 28863 SdHoareTripleChecker+Invalid, 606 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 368 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 226 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:15,764 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5982 Valid, 28863 Invalid, 606 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [12 Valid, 368 Invalid, 0 Unknown, 226 Unchecked, 0.7s Time] [2021-11-23 17:33:15,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2768 states. [2021-11-23 17:33:15,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2768 to 2732. [2021-11-23 17:33:15,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2732 states, 2730 states have (on average 1.4824175824175825) internal successors, (4047), 2731 states have internal predecessors, (4047), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:15,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2732 states to 2732 states and 4047 transitions. [2021-11-23 17:33:15,850 INFO L78 Accepts]: Start accepts. Automaton has 2732 states and 4047 transitions. Word has length 86 [2021-11-23 17:33:15,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:15,851 INFO L470 AbstractCegarLoop]: Abstraction has 2732 states and 4047 transitions. [2021-11-23 17:33:15,851 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 3.2058823529411766) internal successors, (218), 68 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:15,851 INFO L276 IsEmpty]: Start isEmpty. Operand 2732 states and 4047 transitions. [2021-11-23 17:33:15,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 17:33:15,851 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:15,852 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:15,861 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (50)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:16,076 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:16,254 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (51)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:16,452 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:16,453 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:16,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:16,453 INFO L85 PathProgramCache]: Analyzing trace with hash 587604453, now seen corresponding path program 1 times [2021-11-23 17:33:16,453 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:16,453 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2145156973] [2021-11-23 17:33:16,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:16,453 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:16,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:16,455 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:16,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2021-11-23 17:33:16,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:16,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:33:16,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:20,289 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:20,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:21,718 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:21,719 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:21,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2145156973] [2021-11-23 17:33:21,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2145156973] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:21,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1317885661] [2021-11-23 17:33:21,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:21,719 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:21,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:21,722 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:21,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (54)] Waiting until timeout for monitored process [2021-11-23 17:33:21,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:21,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:33:21,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:26,083 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:26,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:26,794 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:26,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1317885661] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:26,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [705212441] [2021-11-23 17:33:26,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:26,796 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:26,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:26,798 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:26,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-23 17:33:26,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:26,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:33:26,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:29,202 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:29,202 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:30,127 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:30,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [705212441] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:30,127 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:30,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 18, 13, 10, 9] total 57 [2021-11-23 17:33:30,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526574883] [2021-11-23 17:33:30,128 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:30,132 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-23 17:33:30,132 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:30,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-23 17:33:30,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=2831, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 17:33:30,134 INFO L87 Difference]: Start difference. First operand 2732 states and 4047 transitions. Second operand has 57 states, 57 states have (on average 6.298245614035087) internal successors, (359), 57 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:30,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:30,866 INFO L93 Difference]: Finished difference Result 3520 states and 5042 transitions. [2021-11-23 17:33:30,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:33:30,867 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 6.298245614035087) internal successors, (359), 57 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-23 17:33:30,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:30,870 INFO L225 Difference]: With dead ends: 3520 [2021-11-23 17:33:30,871 INFO L226 Difference]: Without dead ends: 3089 [2021-11-23 17:33:30,875 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 453 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1488 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=395, Invalid=3027, Unknown=0, NotChecked=0, Total=3422 [2021-11-23 17:33:30,876 INFO L933 BasicCegarLoop]: 1552 mSDtfsCounter, 4492 mSDsluCounter, 20758 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4492 SdHoareTripleChecker+Valid, 22310 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 158 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:30,877 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4492 Valid, 22310 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 235 Invalid, 0 Unknown, 158 Unchecked, 0.3s Time] [2021-11-23 17:33:30,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3089 states. [2021-11-23 17:33:30,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3089 to 2689. [2021-11-23 17:33:30,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2689 states, 2687 states have (on average 1.485299590621511) internal successors, (3991), 2688 states have internal predecessors, (3991), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:30,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2689 states to 2689 states and 3991 transitions. [2021-11-23 17:33:30,994 INFO L78 Accepts]: Start accepts. Automaton has 2689 states and 3991 transitions. Word has length 86 [2021-11-23 17:33:30,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:30,995 INFO L470 AbstractCegarLoop]: Abstraction has 2689 states and 3991 transitions. [2021-11-23 17:33:30,995 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 6.298245614035087) internal successors, (359), 57 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:30,995 INFO L276 IsEmpty]: Start isEmpty. Operand 2689 states and 3991 transitions. [2021-11-23 17:33:30,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 17:33:30,996 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:30,996 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:31,008 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:31,207 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (54)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:31,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:31,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:31,606 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:31,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:31,606 INFO L85 PathProgramCache]: Analyzing trace with hash -224911121, now seen corresponding path program 1 times [2021-11-23 17:33:31,607 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:31,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1553283571] [2021-11-23 17:33:31,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:31,607 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:31,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:31,608 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:31,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-23 17:33:31,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:31,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:33:31,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:33,654 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:33,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:34,202 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:34,202 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:34,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1553283571] [2021-11-23 17:33:34,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1553283571] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:34,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1502023091] [2021-11-23 17:33:34,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:34,203 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:34,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:34,213 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:34,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (57)] Waiting until timeout for monitored process [2021-11-23 17:33:34,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:34,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:33:34,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:36,914 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:36,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:37,670 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:37,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1502023091] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:37,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1328831460] [2021-11-23 17:33:37,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:37,671 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:37,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:37,677 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:37,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-23 17:33:37,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:37,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:33:37,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:40,232 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:40,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:41,727 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:41,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1328831460] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:41,728 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:41,728 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 12, 10] total 45 [2021-11-23 17:33:41,729 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152679265] [2021-11-23 17:33:41,729 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:41,730 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-23 17:33:41,730 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:41,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-23 17:33:41,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1818, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:33:41,731 INFO L87 Difference]: Start difference. First operand 2689 states and 3991 transitions. Second operand has 45 states, 45 states have (on average 8.933333333333334) internal successors, (402), 45 states have internal predecessors, (402), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:43,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:43,166 INFO L93 Difference]: Finished difference Result 3019 states and 4428 transitions. [2021-11-23 17:33:43,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:33:43,166 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 8.933333333333334) internal successors, (402), 45 states have internal predecessors, (402), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-23 17:33:43,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:43,169 INFO L225 Difference]: With dead ends: 3019 [2021-11-23 17:33:43,169 INFO L226 Difference]: Without dead ends: 2588 [2021-11-23 17:33:43,171 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 472 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 728 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=315, Invalid=2877, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 17:33:43,171 INFO L933 BasicCegarLoop]: 1522 mSDtfsCounter, 5848 mSDsluCounter, 38031 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5848 SdHoareTripleChecker+Valid, 39553 SdHoareTripleChecker+Invalid, 336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 233 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:43,171 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5848 Valid, 39553 Invalid, 336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 98 Invalid, 0 Unknown, 233 Unchecked, 0.1s Time] [2021-11-23 17:33:43,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2588 states. [2021-11-23 17:33:43,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2588 to 2587. [2021-11-23 17:33:43,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2587 states, 2585 states have (on average 1.4924564796905222) internal successors, (3858), 2586 states have internal predecessors, (3858), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:43,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2587 states to 2587 states and 3858 transitions. [2021-11-23 17:33:43,274 INFO L78 Accepts]: Start accepts. Automaton has 2587 states and 3858 transitions. Word has length 86 [2021-11-23 17:33:43,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:43,275 INFO L470 AbstractCegarLoop]: Abstraction has 2587 states and 3858 transitions. [2021-11-23 17:33:43,275 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 8.933333333333334) internal successors, (402), 45 states have internal predecessors, (402), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:43,275 INFO L276 IsEmpty]: Start isEmpty. Operand 2587 states and 3858 transitions. [2021-11-23 17:33:43,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-23 17:33:43,276 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:43,277 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:43,279 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (57)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:43,488 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (56)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:43,702 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:43,879 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:43,879 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:43,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:43,880 INFO L85 PathProgramCache]: Analyzing trace with hash 906695599, now seen corresponding path program 1 times [2021-11-23 17:33:43,880 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:43,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1604999420] [2021-11-23 17:33:43,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:43,881 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:43,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:43,882 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:43,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (59)] Waiting until timeout for monitored process [2021-11-23 17:33:43,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:43,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:33:43,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:44,362 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:33:44,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:44,668 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:33:44,668 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:44,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1604999420] [2021-11-23 17:33:44,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1604999420] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:44,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1463001048] [2021-11-23 17:33:44,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:44,669 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:44,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:44,670 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:44,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (60)] Waiting until timeout for monitored process [2021-11-23 17:33:44,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:44,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:33:44,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:44,901 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:33:44,901 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:33:44,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1463001048] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:33:44,901 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:33:44,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 17:33:44,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689045025] [2021-11-23 17:33:44,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:33:44,902 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:33:44,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:44,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:33:44,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:33:44,904 INFO L87 Difference]: Start difference. First operand 2587 states and 3858 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:45,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:45,001 INFO L93 Difference]: Finished difference Result 3570 states and 5139 transitions. [2021-11-23 17:33:45,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:33:45,002 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 87 [2021-11-23 17:33:45,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:45,004 INFO L225 Difference]: With dead ends: 3570 [2021-11-23 17:33:45,005 INFO L226 Difference]: Without dead ends: 2617 [2021-11-23 17:33:45,006 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 253 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:33:45,007 INFO L933 BasicCegarLoop]: 1537 mSDtfsCounter, 1498 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1498 SdHoareTripleChecker+Valid, 1600 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:45,007 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1498 Valid, 1600 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:33:45,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2617 states. [2021-11-23 17:33:45,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2617 to 2588. [2021-11-23 17:33:45,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2588 states, 2586 states have (on average 1.4868522815158547) internal successors, (3845), 2587 states have internal predecessors, (3845), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:45,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2588 states to 2588 states and 3845 transitions. [2021-11-23 17:33:45,164 INFO L78 Accepts]: Start accepts. Automaton has 2588 states and 3845 transitions. Word has length 87 [2021-11-23 17:33:45,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:45,165 INFO L470 AbstractCegarLoop]: Abstraction has 2588 states and 3845 transitions. [2021-11-23 17:33:45,165 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:45,165 INFO L276 IsEmpty]: Start isEmpty. Operand 2588 states and 3845 transitions. [2021-11-23 17:33:45,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-23 17:33:45,166 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:45,167 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:45,169 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (60)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:45,377 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (59)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:45,568 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:33:45,569 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:45,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:45,569 INFO L85 PathProgramCache]: Analyzing trace with hash 422814931, now seen corresponding path program 1 times [2021-11-23 17:33:45,569 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:45,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [396993778] [2021-11-23 17:33:45,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:45,570 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:45,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:45,570 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:45,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (61)] Waiting until timeout for monitored process [2021-11-23 17:33:45,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:45,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:33:45,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:47,955 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:47,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:48,507 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:48,507 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:48,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [396993778] [2021-11-23 17:33:48,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [396993778] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:48,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1512315276] [2021-11-23 17:33:48,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:48,508 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:48,508 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:48,509 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:48,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (62)] Waiting until timeout for monitored process [2021-11-23 17:33:48,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:48,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:33:48,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:50,585 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:50,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:50,927 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:50,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1512315276] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:50,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [631065838] [2021-11-23 17:33:50,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:50,927 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:50,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:50,928 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:50,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-23 17:33:51,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:51,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:33:51,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:52,873 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:52,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:53,211 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:53,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [631065838] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:53,211 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:53,212 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 10, 9] total 18 [2021-11-23 17:33:53,212 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251148067] [2021-11-23 17:33:53,212 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:53,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:33:53,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:53,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:33:53,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:33:53,213 INFO L87 Difference]: Start difference. First operand 2588 states and 3845 transitions. Second operand has 18 states, 18 states have (on average 8.61111111111111) internal successors, (155), 18 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:53,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:53,458 INFO L93 Difference]: Finished difference Result 2954 states and 4323 transitions. [2021-11-23 17:33:53,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:33:53,459 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 8.61111111111111) internal successors, (155), 18 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 87 [2021-11-23 17:33:53,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:53,461 INFO L225 Difference]: With dead ends: 2954 [2021-11-23 17:33:53,461 INFO L226 Difference]: Without dead ends: 2580 [2021-11-23 17:33:53,462 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:33:53,463 INFO L933 BasicCegarLoop]: 1529 mSDtfsCounter, 2925 mSDsluCounter, 13895 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2925 SdHoareTripleChecker+Valid, 15424 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 73 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:53,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2925 Valid, 15424 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 36 Invalid, 0 Unknown, 73 Unchecked, 0.1s Time] [2021-11-23 17:33:53,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2580 states. [2021-11-23 17:33:53,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2580 to 2564. [2021-11-23 17:33:53,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2564 states, 2562 states have (on average 1.4894613583138174) internal successors, (3816), 2563 states have internal predecessors, (3816), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:53,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2564 states to 2564 states and 3816 transitions. [2021-11-23 17:33:53,554 INFO L78 Accepts]: Start accepts. Automaton has 2564 states and 3816 transitions. Word has length 87 [2021-11-23 17:33:53,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:53,554 INFO L470 AbstractCegarLoop]: Abstraction has 2564 states and 3816 transitions. [2021-11-23 17:33:53,554 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 8.61111111111111) internal successors, (155), 18 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:33:53,555 INFO L276 IsEmpty]: Start isEmpty. Operand 2564 states and 3816 transitions. [2021-11-23 17:33:53,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-23 17:33:53,555 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:53,555 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:53,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (62)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:53,767 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (61)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:53,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:54,157 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:54,158 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:54,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:54,158 INFO L85 PathProgramCache]: Analyzing trace with hash 1902889404, now seen corresponding path program 1 times [2021-11-23 17:33:54,159 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:54,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [20435653] [2021-11-23 17:33:54,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:54,159 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:54,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:54,161 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:54,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (64)] Waiting until timeout for monitored process [2021-11-23 17:33:54,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:54,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:33:54,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:54,399 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:54,400 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:33:54,400 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:54,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [20435653] [2021-11-23 17:33:54,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [20435653] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:33:54,401 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:33:54,401 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:33:54,401 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703447757] [2021-11-23 17:33:54,401 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:33:54,402 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:33:54,402 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:54,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:33:54,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:33:54,403 INFO L87 Difference]: Start difference. First operand 2564 states and 3816 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:37,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:37,078 INFO L93 Difference]: Finished difference Result 5570 states and 8743 transitions. [2021-11-23 17:34:37,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:34:37,079 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 87 [2021-11-23 17:34:37,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:37,083 INFO L225 Difference]: With dead ends: 5570 [2021-11-23 17:34:37,083 INFO L226 Difference]: Without dead ends: 4066 [2021-11-23 17:34:37,085 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:34:37,086 INFO L933 BasicCegarLoop]: 1250 mSDtfsCounter, 753 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 2412 mSolverCounterSat, 681 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 35.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 753 SdHoareTripleChecker+Valid, 1359 SdHoareTripleChecker+Invalid, 3093 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 681 IncrementalHoareTripleChecker+Valid, 2412 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 42.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:37,086 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [753 Valid, 1359 Invalid, 3093 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [681 Valid, 2412 Invalid, 0 Unknown, 0 Unchecked, 42.5s Time] [2021-11-23 17:34:37,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4066 states. [2021-11-23 17:34:37,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4066 to 4066. [2021-11-23 17:34:37,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4066 states, 4064 states have (on average 1.469488188976378) internal successors, (5972), 4065 states have internal predecessors, (5972), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:37,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4066 states to 4066 states and 5972 transitions. [2021-11-23 17:34:37,259 INFO L78 Accepts]: Start accepts. Automaton has 4066 states and 5972 transitions. Word has length 87 [2021-11-23 17:34:37,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:37,261 INFO L470 AbstractCegarLoop]: Abstraction has 4066 states and 5972 transitions. [2021-11-23 17:34:37,261 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:34:37,262 INFO L276 IsEmpty]: Start isEmpty. Operand 4066 states and 5972 transitions. [2021-11-23 17:34:37,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-23 17:34:37,263 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:37,263 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:37,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (64)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:37,477 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:37,477 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:37,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:37,478 INFO L85 PathProgramCache]: Analyzing trace with hash 698116337, now seen corresponding path program 1 times [2021-11-23 17:34:37,478 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:37,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1502433674] [2021-11-23 17:34:37,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:37,479 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:37,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:37,481 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:37,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Waiting until timeout for monitored process [2021-11-23 17:34:37,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:37,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:34:37,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:37,871 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:37,871 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:34:37,871 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:37,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1502433674] [2021-11-23 17:34:37,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1502433674] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:34:37,871 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:34:37,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:34:37,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515499094] [2021-11-23 17:34:37,872 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:34:37,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:34:37,872 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:37,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:34:37,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:34:37,873 INFO L87 Difference]: Start difference. First operand 4066 states and 5972 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:18,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:18,344 INFO L93 Difference]: Finished difference Result 10078 states and 15212 transitions. [2021-11-23 17:35:18,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:35:18,345 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 90 [2021-11-23 17:35:18,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:18,353 INFO L225 Difference]: With dead ends: 10078 [2021-11-23 17:35:18,353 INFO L226 Difference]: Without dead ends: 7072 [2021-11-23 17:35:18,358 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:35:18,358 INFO L933 BasicCegarLoop]: 594 mSDtfsCounter, 827 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2414 mSolverCounterSat, 455 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 33.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 827 SdHoareTripleChecker+Valid, 601 SdHoareTripleChecker+Invalid, 2869 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 455 IncrementalHoareTripleChecker+Valid, 2414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 40.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:18,359 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [827 Valid, 601 Invalid, 2869 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [455 Valid, 2414 Invalid, 0 Unknown, 0 Unchecked, 40.3s Time] [2021-11-23 17:35:18,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7072 states. [2021-11-23 17:35:18,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7072 to 7070. [2021-11-23 17:35:18,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7070 states, 7068 states have (on average 1.3515846066779853) internal successors, (9553), 7069 states have internal predecessors, (9553), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:18,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7070 states to 7070 states and 9553 transitions. [2021-11-23 17:35:18,508 INFO L78 Accepts]: Start accepts. Automaton has 7070 states and 9553 transitions. Word has length 90 [2021-11-23 17:35:18,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:18,509 INFO L470 AbstractCegarLoop]: Abstraction has 7070 states and 9553 transitions. [2021-11-23 17:35:18,530 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:35:18,530 INFO L276 IsEmpty]: Start isEmpty. Operand 7070 states and 9553 transitions. [2021-11-23 17:35:18,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-11-23 17:35:18,531 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:18,531 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:18,542 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:18,731 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:18,732 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:18,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:18,733 INFO L85 PathProgramCache]: Analyzing trace with hash -1024731066, now seen corresponding path program 1 times [2021-11-23 17:35:18,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:18,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1104832309] [2021-11-23 17:35:18,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:18,734 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:18,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:18,742 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:18,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Waiting until timeout for monitored process [2021-11-23 17:35:18,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:18,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:35:18,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:19,218 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:19,218 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:35:19,219 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:19,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1104832309] [2021-11-23 17:35:19,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1104832309] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:35:19,219 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:35:19,219 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:35:19,219 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079211545] [2021-11-23 17:35:19,219 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:35:19,220 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:35:19,220 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:19,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:35:19,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:35:19,221 INFO L87 Difference]: Start difference. First operand 7070 states and 9553 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:03,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:03,632 INFO L93 Difference]: Finished difference Result 18337 states and 25131 transitions. [2021-11-23 17:36:03,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:36:03,633 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), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 91 [2021-11-23 17:36:03,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:03,645 INFO L225 Difference]: With dead ends: 18337 [2021-11-23 17:36:03,645 INFO L226 Difference]: Without dead ends: 12327 [2021-11-23 17:36:03,651 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:36:03,651 INFO L933 BasicCegarLoop]: 774 mSDtfsCounter, 786 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2296 mSolverCounterSat, 664 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 36.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 786 SdHoareTripleChecker+Valid, 781 SdHoareTripleChecker+Invalid, 2960 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 664 IncrementalHoareTripleChecker+Valid, 2296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 44.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:03,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [786 Valid, 781 Invalid, 2960 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [664 Valid, 2296 Invalid, 0 Unknown, 0 Unchecked, 44.1s Time] [2021-11-23 17:36:03,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12327 states. [2021-11-23 17:36:03,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12327 to 12327. [2021-11-23 17:36:03,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12327 states, 12325 states have (on average 1.243002028397566) internal successors, (15320), 12326 states have internal predecessors, (15320), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:03,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12327 states to 12327 states and 15320 transitions. [2021-11-23 17:36:03,989 INFO L78 Accepts]: Start accepts. Automaton has 12327 states and 15320 transitions. Word has length 91 [2021-11-23 17:36:03,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:03,990 INFO L470 AbstractCegarLoop]: Abstraction has 12327 states and 15320 transitions. [2021-11-23 17:36:03,990 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:03,990 INFO L276 IsEmpty]: Start isEmpty. Operand 12327 states and 15320 transitions. [2021-11-23 17:36:03,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-23 17:36:03,991 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:03,992 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:36:04,014 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:04,208 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:36:04,208 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:04,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:04,209 INFO L85 PathProgramCache]: Analyzing trace with hash -2060893163, now seen corresponding path program 1 times [2021-11-23 17:36:04,210 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:04,210 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1787920962] [2021-11-23 17:36:04,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:04,210 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:04,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:04,211 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:04,218 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (67)] Waiting until timeout for monitored process [2021-11-23 17:36:04,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:04,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:36:04,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:04,965 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:04,966 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:36:04,966 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:04,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1787920962] [2021-11-23 17:36:04,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1787920962] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:36:04,966 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:36:04,966 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:36:04,966 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163167294] [2021-11-23 17:36:04,966 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:36:04,967 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:36:04,967 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:04,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:36:04,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:36:04,968 INFO L87 Difference]: Start difference. First operand 12327 states and 15320 transitions. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:38,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:38,160 INFO L93 Difference]: Finished difference Result 25847 states and 31805 transitions. [2021-11-23 17:36:38,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:36:38,162 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), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 97 [2021-11-23 17:36:38,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:38,174 INFO L225 Difference]: With dead ends: 25847 [2021-11-23 17:36:38,175 INFO L226 Difference]: Without dead ends: 14580 [2021-11-23 17:36:38,182 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:36:38,183 INFO L933 BasicCegarLoop]: 714 mSDtfsCounter, 778 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2227 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 27.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 778 SdHoareTripleChecker+Valid, 721 SdHoareTripleChecker+Invalid, 2350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 2227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 32.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:38,183 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [778 Valid, 721 Invalid, 2350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 2227 Invalid, 0 Unknown, 0 Unchecked, 32.8s Time] [2021-11-23 17:36:38,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14580 states. [2021-11-23 17:36:38,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14580 to 14580. [2021-11-23 17:36:38,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14580 states, 14578 states have (on average 1.2145013033337906) internal successors, (17705), 14579 states have internal predecessors, (17705), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:38,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14580 states to 14580 states and 17705 transitions. [2021-11-23 17:36:38,543 INFO L78 Accepts]: Start accepts. Automaton has 14580 states and 17705 transitions. Word has length 97 [2021-11-23 17:36:38,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:38,544 INFO L470 AbstractCegarLoop]: Abstraction has 14580 states and 17705 transitions. [2021-11-23 17:36:38,544 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:38,544 INFO L276 IsEmpty]: Start isEmpty. Operand 14580 states and 17705 transitions. [2021-11-23 17:36:38,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:36:38,545 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:38,545 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:36:38,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (67)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:38,746 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:36:38,746 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:38,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:38,747 INFO L85 PathProgramCache]: Analyzing trace with hash 1349093591, now seen corresponding path program 1 times [2021-11-23 17:36:38,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:38,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [241351364] [2021-11-23 17:36:38,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:38,747 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:38,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:38,749 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:38,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Waiting until timeout for monitored process [2021-11-23 17:36:38,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:38,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:38,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:42,211 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:42,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:43,375 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:43,375 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:43,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [241351364] [2021-11-23 17:36:43,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [241351364] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:43,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2094652061] [2021-11-23 17:36:43,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:43,376 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:43,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:43,384 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:43,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (69)] Waiting until timeout for monitored process [2021-11-23 17:36:43,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:43,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:43,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:46,497 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:46,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:47,252 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:47,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2094652061] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:47,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499120106] [2021-11-23 17:36:47,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:47,253 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:36:47,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:36:47,254 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:36:47,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-23 17:36:47,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:47,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:36:47,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:49,600 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:36:49,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:50,920 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:36:50,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1499120106] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:50,921 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:50,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:36:50,921 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673459711] [2021-11-23 17:36:50,921 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:50,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:36:50,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:50,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:36:50,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:36:50,924 INFO L87 Difference]: Start difference. First operand 14580 states and 17705 transitions. Second operand has 34 states, 34 states have (on average 12.558823529411764) internal successors, (427), 33 states have internal predecessors, (427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:52,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:52,075 INFO L93 Difference]: Finished difference Result 15594 states and 19011 transitions. [2021-11-23 17:36:52,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:36:52,076 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.558823529411764) internal successors, (427), 33 states have internal predecessors, (427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:36:52,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:52,090 INFO L225 Difference]: With dead ends: 15594 [2021-11-23 17:36:52,090 INFO L226 Difference]: Without dead ends: 14620 [2021-11-23 17:36:52,094 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 842 GetRequests, 800 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=250, Invalid=1642, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:36:52,094 INFO L933 BasicCegarLoop]: 1535 mSDtfsCounter, 10213 mSDsluCounter, 29025 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10213 SdHoareTripleChecker+Valid, 30560 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 103 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:52,094 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10213 Valid, 30560 Invalid, 167 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [6 Valid, 58 Invalid, 0 Unknown, 103 Unchecked, 0.1s Time] [2021-11-23 17:36:52,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14620 states. [2021-11-23 17:36:52,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14620 to 14620. [2021-11-23 17:36:52,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14620 states, 14618 states have (on average 1.2141879874127788) internal successors, (17749), 14619 states have internal predecessors, (17749), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:52,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14620 states to 14620 states and 17749 transitions. [2021-11-23 17:36:52,468 INFO L78 Accepts]: Start accepts. Automaton has 14620 states and 17749 transitions. Word has length 139 [2021-11-23 17:36:52,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:36:52,469 INFO L470 AbstractCegarLoop]: Abstraction has 14620 states and 17749 transitions. [2021-11-23 17:36:52,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.558823529411764) internal successors, (427), 33 states have internal predecessors, (427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:36:52,469 INFO L276 IsEmpty]: Start isEmpty. Operand 14620 states and 17749 transitions. [2021-11-23 17:36:52,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:36:52,470 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:36:52,470 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:36:52,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:52,682 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:52,873 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (69)] Forceful destruction successful, exit code 0 [2021-11-23 17:36:53,071 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:53,071 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:36:53,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:36:53,072 INFO L85 PathProgramCache]: Analyzing trace with hash 615569687, now seen corresponding path program 1 times [2021-11-23 17:36:53,072 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:36:53,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [928222609] [2021-11-23 17:36:53,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:53,072 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:36:53,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:36:53,074 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:36:53,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (71)] Waiting until timeout for monitored process [2021-11-23 17:36:53,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:53,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:53,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:57,152 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:57,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:58,207 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:58,207 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:36:58,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [928222609] [2021-11-23 17:36:58,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [928222609] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:58,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [754943142] [2021-11-23 17:36:58,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:36:58,208 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:36:58,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:36:58,209 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:36:58,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (72)] Waiting until timeout for monitored process [2021-11-23 17:36:58,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:36:58,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:36:58,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:01,786 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:01,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:02,382 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:02,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [754943142] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:02,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [709201879] [2021-11-23 17:37:02,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:02,382 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:02,382 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:02,383 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:02,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-23 17:37:02,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:02,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:37:02,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:05,410 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:37:05,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:06,551 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:37:06,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [709201879] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:06,551 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:06,552 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:37:06,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001539041] [2021-11-23 17:37:06,552 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:06,553 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:37:06,553 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:06,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:37:06,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:37:06,554 INFO L87 Difference]: Start difference. First operand 14620 states and 17749 transitions. Second operand has 34 states, 34 states have (on average 13.323529411764707) internal successors, (453), 33 states have internal predecessors, (453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:07,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:07,655 INFO L93 Difference]: Finished difference Result 15716 states and 19155 transitions. [2021-11-23 17:37:07,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:37:07,656 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 13.323529411764707) internal successors, (453), 33 states have internal predecessors, (453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:37:07,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:07,670 INFO L225 Difference]: With dead ends: 15716 [2021-11-23 17:37:07,670 INFO L226 Difference]: Without dead ends: 14742 [2021-11-23 17:37:07,674 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 842 GetRequests, 800 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=255, Invalid=1637, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:37:07,674 INFO L933 BasicCegarLoop]: 1542 mSDtfsCounter, 11791 mSDsluCounter, 23218 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11791 SdHoareTripleChecker+Valid, 24760 SdHoareTripleChecker+Invalid, 193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 131 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:07,675 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11791 Valid, 24760 Invalid, 193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 55 Invalid, 0 Unknown, 131 Unchecked, 0.1s Time] [2021-11-23 17:37:07,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14742 states. [2021-11-23 17:37:07,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14742 to 14742. [2021-11-23 17:37:07,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14742 states, 14740 states have (on average 1.2137042062415198) internal successors, (17890), 14741 states have internal predecessors, (17890), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:07,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14742 states to 14742 states and 17890 transitions. [2021-11-23 17:37:07,934 INFO L78 Accepts]: Start accepts. Automaton has 14742 states and 17890 transitions. Word has length 139 [2021-11-23 17:37:07,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:07,935 INFO L470 AbstractCegarLoop]: Abstraction has 14742 states and 17890 transitions. [2021-11-23 17:37:07,935 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 13.323529411764707) internal successors, (453), 33 states have internal predecessors, (453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:07,935 INFO L276 IsEmpty]: Start isEmpty. Operand 14742 states and 17890 transitions. [2021-11-23 17:37:07,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:37:07,937 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:07,938 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:37:07,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (71)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:08,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:08,355 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (72)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:08,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:08,553 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:08,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:08,554 INFO L85 PathProgramCache]: Analyzing trace with hash -516070153, now seen corresponding path program 1 times [2021-11-23 17:37:08,554 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:08,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1400074298] [2021-11-23 17:37:08,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:08,554 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:08,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:08,555 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:08,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Waiting until timeout for monitored process [2021-11-23 17:37:08,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:08,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:37:08,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:12,154 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 33 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:12,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:13,421 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 33 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:13,422 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:13,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1400074298] [2021-11-23 17:37:13,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1400074298] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:13,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [595784679] [2021-11-23 17:37:13,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:13,422 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:13,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:13,423 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:13,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (75)] Waiting until timeout for monitored process [2021-11-23 17:37:13,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:13,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:37:13,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:16,587 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 33 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:16,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:17,503 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 33 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:17,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [595784679] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:17,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1589716611] [2021-11-23 17:37:17,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:17,504 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:17,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:17,505 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:17,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-23 17:37:17,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:17,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:37:17,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:20,489 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 33 proven. 75 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:37:20,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:21,531 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 33 proven. 75 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:37:21,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1589716611] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:21,531 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:21,532 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:37:21,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743880997] [2021-11-23 17:37:21,532 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:21,533 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:37:21,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:21,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:37:21,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:37:21,534 INFO L87 Difference]: Start difference. First operand 14742 states and 17890 transitions. Second operand has 34 states, 34 states have (on average 12.882352941176471) internal successors, (438), 33 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:22,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:22,737 INFO L93 Difference]: Finished difference Result 15926 states and 19392 transitions. [2021-11-23 17:37:22,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:37:22,738 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.882352941176471) internal successors, (438), 33 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:37:22,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:22,753 INFO L225 Difference]: With dead ends: 15926 [2021-11-23 17:37:22,753 INFO L226 Difference]: Without dead ends: 14952 [2021-11-23 17:37:22,757 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 841 GetRequests, 798 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=272, Invalid=1708, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:37:22,758 INFO L933 BasicCegarLoop]: 1539 mSDtfsCounter, 10250 mSDsluCounter, 21662 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10250 SdHoareTripleChecker+Valid, 23201 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 163 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:22,758 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10250 Valid, 23201 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 75 Invalid, 0 Unknown, 163 Unchecked, 0.1s Time] [2021-11-23 17:37:22,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14952 states. [2021-11-23 17:37:23,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14952 to 14952. [2021-11-23 17:37:23,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14952 states, 14950 states have (on average 1.2125083612040133) internal successors, (18127), 14951 states have internal predecessors, (18127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:23,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14952 states to 14952 states and 18127 transitions. [2021-11-23 17:37:23,106 INFO L78 Accepts]: Start accepts. Automaton has 14952 states and 18127 transitions. Word has length 139 [2021-11-23 17:37:23,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:23,107 INFO L470 AbstractCegarLoop]: Abstraction has 14952 states and 18127 transitions. [2021-11-23 17:37:23,107 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.882352941176471) internal successors, (438), 33 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:23,107 INFO L276 IsEmpty]: Start isEmpty. Operand 14952 states and 18127 transitions. [2021-11-23 17:37:23,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:37:23,109 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:23,109 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:37:23,135 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:23,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:23,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (75)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:23,710 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:23,710 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:23,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:23,711 INFO L85 PathProgramCache]: Analyzing trace with hash -496273575, now seen corresponding path program 1 times [2021-11-23 17:37:23,711 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:23,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1980787737] [2021-11-23 17:37:23,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:23,712 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:23,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:23,712 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:23,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (77)] Waiting until timeout for monitored process [2021-11-23 17:37:23,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:23,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:37:23,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:26,667 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 65 proven. 40 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:37:26,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:27,737 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 65 proven. 40 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:37:27,738 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:27,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1980787737] [2021-11-23 17:37:27,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1980787737] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:27,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [517850280] [2021-11-23 17:37:27,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:27,738 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:27,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:27,739 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:27,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (78)] Waiting until timeout for monitored process [2021-11-23 17:37:27,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:27,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:37:27,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:31,329 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:31,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:32,379 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:32,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [517850280] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:32,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1421136494] [2021-11-23 17:37:32,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:32,380 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:32,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:32,381 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:32,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2021-11-23 17:37:32,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:32,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:37:32,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:35,635 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 88 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:37:35,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:36,880 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 16 proven. 88 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:37:36,881 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1421136494] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:36,881 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:36,881 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 17:37:36,882 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223883047] [2021-11-23 17:37:36,882 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:36,883 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 17:37:36,883 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:36,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 17:37:36,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:37:36,884 INFO L87 Difference]: Start difference. First operand 14952 states and 18127 transitions. Second operand has 39 states, 39 states have (on average 15.128205128205128) internal successors, (590), 38 states have internal predecessors, (590), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:39,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:39,064 INFO L93 Difference]: Finished difference Result 16365 states and 19919 transitions. [2021-11-23 17:37:39,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:37:39,065 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 15.128205128205128) internal successors, (590), 38 states have internal predecessors, (590), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:37:39,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:39,081 INFO L225 Difference]: With dead ends: 16365 [2021-11-23 17:37:39,081 INFO L226 Difference]: Without dead ends: 15391 [2021-11-23 17:37:39,085 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 854 GetRequests, 797 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 768 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=384, Invalid=2808, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 17:37:39,086 INFO L933 BasicCegarLoop]: 1528 mSDtfsCounter, 11732 mSDsluCounter, 30546 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11732 SdHoareTripleChecker+Valid, 32074 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 186 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:39,087 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11732 Valid, 32074 Invalid, 274 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [7 Valid, 81 Invalid, 0 Unknown, 186 Unchecked, 0.1s Time] [2021-11-23 17:37:39,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15391 states. [2021-11-23 17:37:39,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15391 to 15389. [2021-11-23 17:37:39,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15389 states, 15387 states have (on average 1.2112822512510562) internal successors, (18638), 15388 states have internal predecessors, (18638), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:39,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15389 states to 15389 states and 18638 transitions. [2021-11-23 17:37:39,438 INFO L78 Accepts]: Start accepts. Automaton has 15389 states and 18638 transitions. Word has length 139 [2021-11-23 17:37:39,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:39,438 INFO L470 AbstractCegarLoop]: Abstraction has 15389 states and 18638 transitions. [2021-11-23 17:37:39,439 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 15.128205128205128) internal successors, (590), 38 states have internal predecessors, (590), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:39,439 INFO L276 IsEmpty]: Start isEmpty. Operand 15389 states and 18638 transitions. [2021-11-23 17:37:39,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:37:39,441 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:39,442 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:37:39,476 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:39,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (77)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:39,859 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (78)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:40,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:40,058 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:40,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:40,058 INFO L85 PathProgramCache]: Analyzing trace with hash 451700313, now seen corresponding path program 1 times [2021-11-23 17:37:40,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:40,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1085220742] [2021-11-23 17:37:40,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:40,059 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:40,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:40,060 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:40,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (80)] Waiting until timeout for monitored process [2021-11-23 17:37:40,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:40,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:37:40,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:42,879 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 69 proven. 34 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:37:42,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:43,940 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 69 proven. 34 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:37:43,940 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:43,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1085220742] [2021-11-23 17:37:43,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1085220742] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:43,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [784675667] [2021-11-23 17:37:43,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:43,941 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:43,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:43,941 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:43,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (81)] Waiting until timeout for monitored process [2021-11-23 17:37:44,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:44,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:37:44,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:48,707 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:48,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:50,131 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:50,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [784675667] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:50,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1694639724] [2021-11-23 17:37:50,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:50,131 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:50,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:50,132 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:50,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-23 17:37:50,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:50,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:37:50,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:53,277 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:37:53,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:54,651 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:37:54,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1694639724] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:54,651 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:54,652 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:37:54,652 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668652733] [2021-11-23 17:37:54,652 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:54,653 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:37:54,653 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:54,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:37:54,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:37:54,654 INFO L87 Difference]: Start difference. First operand 15389 states and 18638 transitions. Second operand has 48 states, 48 states have (on average 12.916666666666666) internal successors, (620), 47 states have internal predecessors, (620), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:57,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:57,093 INFO L93 Difference]: Finished difference Result 16588 states and 20168 transitions. [2021-11-23 17:37:57,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:37:57,094 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 12.916666666666666) internal successors, (620), 47 states have internal predecessors, (620), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:37:57,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:57,110 INFO L225 Difference]: With dead ends: 16588 [2021-11-23 17:37:57,110 INFO L226 Difference]: Without dead ends: 15614 [2021-11-23 17:37:57,114 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 855 GetRequests, 789 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=389, Invalid=3771, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 17:37:57,115 INFO L933 BasicCegarLoop]: 1542 mSDtfsCounter, 8890 mSDsluCounter, 46080 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8890 SdHoareTripleChecker+Valid, 47622 SdHoareTripleChecker+Invalid, 298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 245 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:57,115 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8890 Valid, 47622 Invalid, 298 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [4 Valid, 49 Invalid, 0 Unknown, 245 Unchecked, 0.1s Time] [2021-11-23 17:37:57,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15614 states. [2021-11-23 17:37:57,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15614 to 15610. [2021-11-23 17:37:57,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15610 states, 15608 states have (on average 1.210725269092773) internal successors, (18897), 15609 states have internal predecessors, (18897), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:57,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15610 states to 15610 states and 18897 transitions. [2021-11-23 17:37:57,540 INFO L78 Accepts]: Start accepts. Automaton has 15610 states and 18897 transitions. Word has length 139 [2021-11-23 17:37:57,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:57,541 INFO L470 AbstractCegarLoop]: Abstraction has 15610 states and 18897 transitions. [2021-11-23 17:37:57,541 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 12.916666666666666) internal successors, (620), 47 states have internal predecessors, (620), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:57,541 INFO L276 IsEmpty]: Start isEmpty. Operand 15610 states and 18897 transitions. [2021-11-23 17:37:57,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:37:57,545 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:57,545 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:37:57,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (80)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:57,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (81)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:57,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:58,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:58,146 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:58,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:58,147 INFO L85 PathProgramCache]: Analyzing trace with hash 996005209, now seen corresponding path program 1 times [2021-11-23 17:37:58,147 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:58,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1314666133] [2021-11-23 17:37:58,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:58,147 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:58,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:58,148 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:58,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Waiting until timeout for monitored process [2021-11-23 17:37:58,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:58,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:37:58,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:00,957 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 73 proven. 28 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:38:00,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:01,812 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 73 proven. 28 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:38:01,813 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:01,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1314666133] [2021-11-23 17:38:01,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1314666133] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:01,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [378701701] [2021-11-23 17:38:01,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:01,813 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:01,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:01,816 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:01,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Waiting until timeout for monitored process [2021-11-23 17:38:01,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:01,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:38:02,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:06,077 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:06,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:07,654 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:07,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [378701701] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:07,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1325615854] [2021-11-23 17:38:07,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:07,654 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:07,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:07,655 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:07,657 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-23 17:38:07,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:07,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:38:07,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:10,492 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:38:10,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:11,932 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:38:11,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1325615854] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:11,932 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:11,933 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 49 [2021-11-23 17:38:11,933 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566022955] [2021-11-23 17:38:11,933 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:11,934 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-23 17:38:11,934 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:11,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-23 17:38:11,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=2242, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:38:11,935 INFO L87 Difference]: Start difference. First operand 15610 states and 18897 transitions. Second operand has 50 states, 50 states have (on average 12.46) internal successors, (623), 49 states have internal predecessors, (623), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:14,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:14,712 INFO L93 Difference]: Finished difference Result 16584 states and 20158 transitions. [2021-11-23 17:38:14,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:38:14,713 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 12.46) internal successors, (623), 49 states have internal predecessors, (623), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:38:14,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:14,734 INFO L225 Difference]: With dead ends: 16584 [2021-11-23 17:38:14,734 INFO L226 Difference]: Without dead ends: 15610 [2021-11-23 17:38:14,740 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 854 GetRequests, 788 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1099 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=410, Invalid=4012, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 17:38:14,741 INFO L933 BasicCegarLoop]: 1520 mSDtfsCounter, 15983 mSDsluCounter, 40821 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15983 SdHoareTripleChecker+Valid, 42341 SdHoareTripleChecker+Invalid, 307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 182 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:14,741 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15983 Valid, 42341 Invalid, 307 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [9 Valid, 116 Invalid, 0 Unknown, 182 Unchecked, 0.2s Time] [2021-11-23 17:38:14,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15610 states. [2021-11-23 17:38:15,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15610 to 15610. [2021-11-23 17:38:15,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15610 states, 15608 states have (on average 1.2104689902614043) internal successors, (18893), 15609 states have internal predecessors, (18893), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:15,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15610 states to 15610 states and 18893 transitions. [2021-11-23 17:38:15,132 INFO L78 Accepts]: Start accepts. Automaton has 15610 states and 18893 transitions. Word has length 139 [2021-11-23 17:38:15,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:15,133 INFO L470 AbstractCegarLoop]: Abstraction has 15610 states and 18893 transitions. [2021-11-23 17:38:15,133 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 12.46) internal successors, (623), 49 states have internal predecessors, (623), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:15,133 INFO L276 IsEmpty]: Start isEmpty. Operand 15610 states and 18893 transitions. [2021-11-23 17:38:15,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:38:15,137 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:15,137 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:15,154 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:15,351 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:15,573 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:15,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:15,750 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:15,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:15,750 INFO L85 PathProgramCache]: Analyzing trace with hash -679492519, now seen corresponding path program 1 times [2021-11-23 17:38:15,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:15,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1795551283] [2021-11-23 17:38:15,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:15,751 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:15,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:15,753 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:15,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Waiting until timeout for monitored process [2021-11-23 17:38:15,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:15,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:38:15,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:18,153 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:38:18,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:19,330 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:38:19,330 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:19,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1795551283] [2021-11-23 17:38:19,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1795551283] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:19,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1660706676] [2021-11-23 17:38:19,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:19,331 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:19,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:19,332 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:19,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Waiting until timeout for monitored process [2021-11-23 17:38:19,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:19,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:38:19,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:22,448 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:22,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:23,644 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:23,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1660706676] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:23,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [487137473] [2021-11-23 17:38:23,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:23,645 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:23,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:23,646 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:23,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-23 17:38:23,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:23,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:38:23,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:26,181 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:38:26,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:27,524 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:38:27,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [487137473] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:27,525 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:27,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 17:38:27,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330359863] [2021-11-23 17:38:27,526 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:27,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 17:38:27,527 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:27,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 17:38:27,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:38:27,527 INFO L87 Difference]: Start difference. First operand 15610 states and 18893 transitions. Second operand has 39 states, 39 states have (on average 13.846153846153847) internal successors, (540), 38 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:29,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:29,417 INFO L93 Difference]: Finished difference Result 16847 states and 20477 transitions. [2021-11-23 17:38:29,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:38:29,418 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 13.846153846153847) internal successors, (540), 38 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:38:29,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:29,433 INFO L225 Difference]: With dead ends: 16847 [2021-11-23 17:38:29,433 INFO L226 Difference]: Without dead ends: 15873 [2021-11-23 17:38:29,438 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 850 GetRequests, 795 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=359, Invalid=2611, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:38:29,439 INFO L933 BasicCegarLoop]: 1525 mSDtfsCounter, 11830 mSDsluCounter, 29006 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11830 SdHoareTripleChecker+Valid, 30531 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 163 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:29,439 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11830 Valid, 30531 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 95 Invalid, 0 Unknown, 163 Unchecked, 0.1s Time] [2021-11-23 17:38:29,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15873 states. [2021-11-23 17:38:29,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15873 to 15871. [2021-11-23 17:38:29,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15871 states, 15869 states have (on average 1.2098430903018464) internal successors, (19199), 15870 states have internal predecessors, (19199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:29,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15871 states to 15871 states and 19199 transitions. [2021-11-23 17:38:29,929 INFO L78 Accepts]: Start accepts. Automaton has 15871 states and 19199 transitions. Word has length 139 [2021-11-23 17:38:29,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:29,929 INFO L470 AbstractCegarLoop]: Abstraction has 15871 states and 19199 transitions. [2021-11-23 17:38:29,929 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 13.846153846153847) internal successors, (540), 38 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:29,930 INFO L276 IsEmpty]: Start isEmpty. Operand 15871 states and 19199 transitions. [2021-11-23 17:38:29,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:38:29,934 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:29,934 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:29,951 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:30,159 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Ended with exit code 0 [2021-11-23 17:38:30,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:30,537 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:30,537 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:30,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:30,537 INFO L85 PathProgramCache]: Analyzing trace with hash -1944468657, now seen corresponding path program 1 times [2021-11-23 17:38:30,538 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:30,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [26999864] [2021-11-23 17:38:30,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:30,538 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:30,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:30,539 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:30,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Waiting until timeout for monitored process [2021-11-23 17:38:30,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:30,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:38:30,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:34,666 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:34,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:35,725 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:35,725 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:35,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [26999864] [2021-11-23 17:38:35,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [26999864] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:35,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [934483238] [2021-11-23 17:38:35,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:35,726 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:35,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:35,727 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:35,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Waiting until timeout for monitored process [2021-11-23 17:38:35,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:35,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:38:35,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:39,329 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:39,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:39,952 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:39,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [934483238] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:39,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1876188350] [2021-11-23 17:38:39,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:39,953 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:39,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:39,954 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:39,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-23 17:38:40,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:40,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:38:40,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:43,097 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:38:43,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:44,270 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:38:44,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1876188350] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:44,271 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:44,271 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:38:44,271 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113487966] [2021-11-23 17:38:44,271 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:44,272 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:38:44,272 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:44,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:38:44,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:38:44,273 INFO L87 Difference]: Start difference. First operand 15871 states and 19199 transitions. Second operand has 34 states, 34 states have (on average 13.294117647058824) internal successors, (452), 33 states have internal predecessors, (452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:45,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:45,381 INFO L93 Difference]: Finished difference Result 16964 states and 20597 transitions. [2021-11-23 17:38:45,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:38:45,381 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 13.294117647058824) internal successors, (452), 33 states have internal predecessors, (452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-23 17:38:45,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:45,397 INFO L225 Difference]: With dead ends: 16964 [2021-11-23 17:38:45,397 INFO L226 Difference]: Without dead ends: 15895 [2021-11-23 17:38:45,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 847 GetRequests, 805 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=244, Invalid=1648, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:38:45,404 INFO L933 BasicCegarLoop]: 1542 mSDtfsCounter, 5882 mSDsluCounter, 25924 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5882 SdHoareTripleChecker+Valid, 27466 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 129 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:45,405 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5882 Valid, 27466 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 34 Invalid, 0 Unknown, 129 Unchecked, 0.0s Time] [2021-11-23 17:38:45,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15895 states. [2021-11-23 17:38:45,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15895 to 15871. [2021-11-23 17:38:45,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15871 states, 15869 states have (on average 1.2098430903018464) internal successors, (19199), 15870 states have internal predecessors, (19199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:45,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15871 states to 15871 states and 19199 transitions. [2021-11-23 17:38:45,857 INFO L78 Accepts]: Start accepts. Automaton has 15871 states and 19199 transitions. Word has length 140 [2021-11-23 17:38:45,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:45,858 INFO L470 AbstractCegarLoop]: Abstraction has 15871 states and 19199 transitions. [2021-11-23 17:38:45,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 13.294117647058824) internal successors, (452), 33 states have internal predecessors, (452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:45,858 INFO L276 IsEmpty]: Start isEmpty. Operand 15871 states and 19199 transitions. [2021-11-23 17:38:45,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:38:45,860 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:45,860 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:45,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:46,084 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:46,264 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:46,463 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:46,464 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:46,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:46,464 INFO L85 PathProgramCache]: Analyzing trace with hash 717160927, now seen corresponding path program 1 times [2021-11-23 17:38:46,465 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:46,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [361787595] [2021-11-23 17:38:46,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:46,465 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:46,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:46,466 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:46,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Waiting until timeout for monitored process [2021-11-23 17:38:46,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:46,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:46,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:48,325 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:38:48,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:49,366 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:38:49,366 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:49,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [361787595] [2021-11-23 17:38:49,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [361787595] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:49,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1939936519] [2021-11-23 17:38:49,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:49,367 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:49,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:49,368 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:49,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Waiting until timeout for monitored process [2021-11-23 17:38:49,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:49,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:49,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:51,298 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:38:51,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:52,264 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:38:52,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1939936519] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:52,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [381695946] [2021-11-23 17:38:52,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:52,265 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:52,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:52,266 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:52,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2021-11-23 17:38:52,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:52,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:52,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:54,055 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:38:54,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:54,950 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:38:54,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [381695946] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:54,950 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:54,950 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:38:54,950 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277796952] [2021-11-23 17:38:54,951 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:54,951 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:38:54,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:54,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:38:54,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:38:54,952 INFO L87 Difference]: Start difference. First operand 15871 states and 19199 transitions. Second operand has 16 states, 16 states have (on average 12.6875) internal successors, (203), 15 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:55,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:55,683 INFO L93 Difference]: Finished difference Result 17897 states and 21808 transitions. [2021-11-23 17:38:55,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:38:55,684 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 12.6875) internal successors, (203), 15 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-23 17:38:55,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:55,700 INFO L225 Difference]: With dead ends: 17897 [2021-11-23 17:38:55,700 INFO L226 Difference]: Without dead ends: 16919 [2021-11-23 17:38:55,705 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 843 GetRequests, 821 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=119, Invalid=433, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:38:55,706 INFO L933 BasicCegarLoop]: 1537 mSDtfsCounter, 7354 mSDsluCounter, 11056 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7354 SdHoareTripleChecker+Valid, 12593 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 91 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:55,706 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7354 Valid, 12593 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 26 Invalid, 0 Unknown, 91 Unchecked, 0.0s Time] [2021-11-23 17:38:55,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16919 states. [2021-11-23 17:38:56,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16919 to 16891. [2021-11-23 17:38:56,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16891 states, 16889 states have (on average 1.2139262241695778) internal successors, (20502), 16890 states have internal predecessors, (20502), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:56,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16891 states to 16891 states and 20502 transitions. [2021-11-23 17:38:56,200 INFO L78 Accepts]: Start accepts. Automaton has 16891 states and 20502 transitions. Word has length 140 [2021-11-23 17:38:56,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:56,201 INFO L470 AbstractCegarLoop]: Abstraction has 16891 states and 20502 transitions. [2021-11-23 17:38:56,201 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 12.6875) internal successors, (203), 15 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:56,201 INFO L276 IsEmpty]: Start isEmpty. Operand 16891 states and 20502 transitions. [2021-11-23 17:38:56,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:38:56,203 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:56,204 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:56,227 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:56,406 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:56,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:56,804 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:56,805 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:56,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:56,805 INFO L85 PathProgramCache]: Analyzing trace with hash -1128206239, now seen corresponding path program 1 times [2021-11-23 17:38:56,805 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:56,805 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [526297731] [2021-11-23 17:38:56,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:56,806 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:56,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:56,806 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:56,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Waiting until timeout for monitored process [2021-11-23 17:38:56,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:56,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:38:56,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:58,231 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 96 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 17:38:58,232 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:58,232 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:58,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [526297731] [2021-11-23 17:38:58,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [526297731] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:58,232 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:58,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:38:58,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293418631] [2021-11-23 17:38:58,233 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:58,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:38:58,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:58,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:38:58,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:58,234 INFO L87 Difference]: Start difference. First operand 16891 states and 20502 transitions. Second operand has 6 states, 6 states have (on average 22.166666666666668) internal successors, (133), 5 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:58,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:58,624 INFO L93 Difference]: Finished difference Result 17891 states and 21788 transitions. [2021-11-23 17:38:58,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:38:58,625 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 22.166666666666668) internal successors, (133), 5 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-23 17:38:58,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:58,641 INFO L225 Difference]: With dead ends: 17891 [2021-11-23 17:38:58,641 INFO L226 Difference]: Without dead ends: 16917 [2021-11-23 17:38:58,646 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:38:58,647 INFO L933 BasicCegarLoop]: 1538 mSDtfsCounter, 2954 mSDsluCounter, 1650 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2954 SdHoareTripleChecker+Valid, 3188 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 49 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:58,647 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2954 Valid, 3188 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 0 Unknown, 49 Unchecked, 0.0s Time] [2021-11-23 17:38:58,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16917 states. [2021-11-23 17:38:59,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16917 to 16891. [2021-11-23 17:38:59,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16891 states, 16889 states have (on average 1.2125643910237434) internal successors, (20479), 16890 states have internal predecessors, (20479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:59,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16891 states to 16891 states and 20479 transitions. [2021-11-23 17:38:59,213 INFO L78 Accepts]: Start accepts. Automaton has 16891 states and 20479 transitions. Word has length 140 [2021-11-23 17:38:59,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:59,214 INFO L470 AbstractCegarLoop]: Abstraction has 16891 states and 20479 transitions. [2021-11-23 17:38:59,214 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 22.166666666666668) internal successors, (133), 5 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:59,214 INFO L276 IsEmpty]: Start isEmpty. Operand 16891 states and 20479 transitions. [2021-11-23 17:38:59,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:38:59,217 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:59,217 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:59,228 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:59,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:59,418 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:59,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:59,418 INFO L85 PathProgramCache]: Analyzing trace with hash -180232351, now seen corresponding path program 1 times [2021-11-23 17:38:59,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:59,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1318224491] [2021-11-23 17:38:59,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:59,419 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:59,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:59,420 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:59,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (96)] Waiting until timeout for monitored process [2021-11-23 17:38:59,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:59,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:38:59,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:02,269 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 69 proven. 34 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:39:02,270 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:03,313 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 69 proven. 34 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:39:03,314 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:03,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1318224491] [2021-11-23 17:39:03,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1318224491] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:03,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1494622771] [2021-11-23 17:39:03,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:03,314 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:03,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:03,315 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:03,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (97)] Waiting until timeout for monitored process [2021-11-23 17:39:03,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:03,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:39:03,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:05,704 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:39:05,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:06,890 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:39:06,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1494622771] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:06,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771576638] [2021-11-23 17:39:06,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:06,891 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:06,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:06,892 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:06,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Waiting until timeout for monitored process [2021-11-23 17:39:06,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:06,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:39:06,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:08,709 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:39:08,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:09,693 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:39:09,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [771576638] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:09,694 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:09,694 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:39:09,694 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795707363] [2021-11-23 17:39:09,695 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:09,695 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:39:09,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:09,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:39:09,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:39:09,696 INFO L87 Difference]: Start difference. First operand 16891 states and 20479 transitions. Second operand has 32 states, 32 states have (on average 12.5) internal successors, (400), 31 states have internal predecessors, (400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:12,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:12,115 INFO L93 Difference]: Finished difference Result 19704 states and 24042 transitions. [2021-11-23 17:39:12,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:39:12,117 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 12.5) internal successors, (400), 31 states have internal predecessors, (400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-23 17:39:12,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:12,136 INFO L225 Difference]: With dead ends: 19704 [2021-11-23 17:39:12,136 INFO L226 Difference]: Without dead ends: 18730 [2021-11-23 17:39:12,141 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 861 GetRequests, 809 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=300, Invalid=2352, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 17:39:12,142 INFO L933 BasicCegarLoop]: 1561 mSDtfsCounter, 10384 mSDsluCounter, 24903 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10384 SdHoareTripleChecker+Valid, 26464 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 143 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:12,142 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10384 Valid, 26464 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 82 Invalid, 0 Unknown, 143 Unchecked, 0.1s Time] [2021-11-23 17:39:12,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18730 states. [2021-11-23 17:39:12,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18730 to 18706. [2021-11-23 17:39:12,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18706 states, 18704 states have (on average 1.2160500427715997) internal successors, (22745), 18705 states have internal predecessors, (22745), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:12,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18706 states to 18706 states and 22745 transitions. [2021-11-23 17:39:12,864 INFO L78 Accepts]: Start accepts. Automaton has 18706 states and 22745 transitions. Word has length 140 [2021-11-23 17:39:12,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:12,865 INFO L470 AbstractCegarLoop]: Abstraction has 18706 states and 22745 transitions. [2021-11-23 17:39:12,865 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 12.5) internal successors, (400), 31 states have internal predecessors, (400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:12,865 INFO L276 IsEmpty]: Start isEmpty. Operand 18706 states and 22745 transitions. [2021-11-23 17:39:12,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:39:12,868 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:12,868 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:12,894 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:13,079 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (96)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:13,271 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (97)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:13,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:13,469 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:13,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:13,470 INFO L85 PathProgramCache]: Analyzing trace with hash 364072545, now seen corresponding path program 1 times [2021-11-23 17:39:13,471 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:13,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1611449437] [2021-11-23 17:39:13,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:13,471 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:13,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:13,472 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:13,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (99)] Waiting until timeout for monitored process [2021-11-23 17:39:13,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:13,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:39:13,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:16,288 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 73 proven. 28 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:39:16,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:17,199 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 73 proven. 28 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:39:17,199 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:17,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1611449437] [2021-11-23 17:39:17,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1611449437] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:17,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1349548088] [2021-11-23 17:39:17,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:17,200 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:17,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:17,201 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:17,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (100)] Waiting until timeout for monitored process [2021-11-23 17:39:17,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:17,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:39:17,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:19,624 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:39:19,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:20,920 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:39:20,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1349548088] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:20,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542201418] [2021-11-23 17:39:20,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:20,921 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:20,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:20,922 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:20,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2021-11-23 17:39:21,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:21,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:39:21,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:22,726 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:39:22,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:23,633 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:39:23,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542201418] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:23,634 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:23,634 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:39:23,634 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833940970] [2021-11-23 17:39:23,634 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:23,635 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:39:23,635 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:23,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:39:23,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:39:23,636 INFO L87 Difference]: Start difference. First operand 18706 states and 22745 transitions. Second operand has 32 states, 32 states have (on average 12.59375) internal successors, (403), 31 states have internal predecessors, (403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:26,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:26,858 INFO L93 Difference]: Finished difference Result 23891 states and 29285 transitions. [2021-11-23 17:39:26,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-23 17:39:26,858 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 12.59375) internal successors, (403), 31 states have internal predecessors, (403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-23 17:39:26,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:26,881 INFO L225 Difference]: With dead ends: 23891 [2021-11-23 17:39:26,881 INFO L226 Difference]: Without dead ends: 22917 [2021-11-23 17:39:26,887 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 873 GetRequests, 811 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 913 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=400, Invalid=3382, Unknown=0, NotChecked=0, Total=3782 [2021-11-23 17:39:26,887 INFO L933 BasicCegarLoop]: 1576 mSDtfsCounter, 10406 mSDsluCounter, 26789 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10406 SdHoareTripleChecker+Valid, 28365 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 227 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:26,888 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10406 Valid, 28365 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 107 Invalid, 0 Unknown, 227 Unchecked, 0.2s Time] [2021-11-23 17:39:26,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22917 states. [2021-11-23 17:39:27,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22917 to 20994. [2021-11-23 17:39:27,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20994 states, 20992 states have (on average 1.220655487804878) internal successors, (25624), 20993 states have internal predecessors, (25624), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:27,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20994 states to 20994 states and 25624 transitions. [2021-11-23 17:39:27,892 INFO L78 Accepts]: Start accepts. Automaton has 20994 states and 25624 transitions. Word has length 140 [2021-11-23 17:39:27,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:27,892 INFO L470 AbstractCegarLoop]: Abstraction has 20994 states and 25624 transitions. [2021-11-23 17:39:27,893 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 12.59375) internal successors, (403), 31 states have internal predecessors, (403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:27,893 INFO L276 IsEmpty]: Start isEmpty. Operand 20994 states and 25624 transitions. [2021-11-23 17:39:27,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:39:27,897 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:27,897 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:27,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (99)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:28,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (100)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:28,324 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:28,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:28,498 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:28,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:28,499 INFO L85 PathProgramCache]: Analyzing trace with hash -1311425183, now seen corresponding path program 1 times [2021-11-23 17:39:28,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:28,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [171386420] [2021-11-23 17:39:28,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:28,500 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:28,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:28,501 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:28,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Waiting until timeout for monitored process [2021-11-23 17:39:28,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:28,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:39:28,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:30,891 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:39:30,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:32,051 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:39:32,052 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:32,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [171386420] [2021-11-23 17:39:32,052 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [171386420] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:32,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2146076533] [2021-11-23 17:39:32,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:32,052 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:32,052 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:32,053 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:32,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Waiting until timeout for monitored process [2021-11-23 17:39:32,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:32,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:39:32,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:34,032 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:39:34,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:35,015 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:39:35,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2146076533] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:35,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455863159] [2021-11-23 17:39:35,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:35,016 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:35,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:35,017 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:35,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2021-11-23 17:39:35,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:35,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:39:35,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:36,959 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:39:36,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:37,834 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:39:37,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1455863159] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:37,834 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:37,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 19 [2021-11-23 17:39:37,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930541274] [2021-11-23 17:39:37,835 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:37,836 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 17:39:37,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:37,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 17:39:37,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:39:37,837 INFO L87 Difference]: Start difference. First operand 20994 states and 25624 transitions. Second operand has 20 states, 20 states have (on average 14.4) internal successors, (288), 19 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:39,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:39,685 INFO L93 Difference]: Finished difference Result 28380 states and 35015 transitions. [2021-11-23 17:39:39,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 17:39:39,685 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 14.4) internal successors, (288), 19 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-23 17:39:39,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:39,716 INFO L225 Difference]: With dead ends: 28380 [2021-11-23 17:39:39,716 INFO L226 Difference]: Without dead ends: 27406 [2021-11-23 17:39:39,722 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 847 GetRequests, 819 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=152, Invalid=718, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:39:39,722 INFO L933 BasicCegarLoop]: 1570 mSDtfsCounter, 5975 mSDsluCounter, 14055 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5975 SdHoareTripleChecker+Valid, 15625 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 147 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:39,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5975 Valid, 15625 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 64 Invalid, 0 Unknown, 147 Unchecked, 0.1s Time] [2021-11-23 17:39:39,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27406 states. [2021-11-23 17:39:41,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27406 to 27318. [2021-11-23 17:39:41,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27318 states, 27316 states have (on average 1.2277419827207496) internal successors, (33537), 27317 states have internal predecessors, (33537), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:41,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27318 states to 27318 states and 33537 transitions. [2021-11-23 17:39:41,205 INFO L78 Accepts]: Start accepts. Automaton has 27318 states and 33537 transitions. Word has length 140 [2021-11-23 17:39:41,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:41,205 INFO L470 AbstractCegarLoop]: Abstraction has 27318 states and 33537 transitions. [2021-11-23 17:39:41,205 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 14.4) internal successors, (288), 19 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:41,205 INFO L276 IsEmpty]: Start isEmpty. Operand 27318 states and 33537 transitions. [2021-11-23 17:39:41,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:39:41,210 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:41,210 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:41,236 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:41,421 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:41,613 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:41,812 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:41,812 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:41,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:41,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1878294552, now seen corresponding path program 1 times [2021-11-23 17:39:41,813 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:41,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1971834378] [2021-11-23 17:39:41,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:41,813 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:41,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:41,814 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:41,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Waiting until timeout for monitored process [2021-11-23 17:39:41,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:41,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:39:41,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:43,202 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 95 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 17:39:43,203 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:39:43,203 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:43,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1971834378] [2021-11-23 17:39:43,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1971834378] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:39:43,203 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:39:43,203 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:39:43,203 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858392420] [2021-11-23 17:39:43,203 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:39:43,204 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:39:43,204 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:43,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:39:43,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:39:43,205 INFO L87 Difference]: Start difference. First operand 27318 states and 33537 transitions. Second operand has 6 states, 6 states have (on average 22.0) internal successors, (132), 5 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:45,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:45,049 INFO L93 Difference]: Finished difference Result 34408 states and 42440 transitions. [2021-11-23 17:39:45,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:39:45,050 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 22.0) internal successors, (132), 5 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-23 17:39:45,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:45,089 INFO L225 Difference]: With dead ends: 34408 [2021-11-23 17:39:45,089 INFO L226 Difference]: Without dead ends: 31836 [2021-11-23 17:39:45,098 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:39:45,099 INFO L933 BasicCegarLoop]: 1545 mSDtfsCounter, 2977 mSDsluCounter, 1600 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2977 SdHoareTripleChecker+Valid, 3145 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:45,099 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2977 Valid, 3145 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 37 Unchecked, 0.0s Time] [2021-11-23 17:39:45,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31836 states. [2021-11-23 17:39:47,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31836 to 31726. [2021-11-23 17:39:47,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31726 states, 31724 states have (on average 1.2282499054343714) internal successors, (38965), 31725 states have internal predecessors, (38965), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:47,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31726 states to 31726 states and 38965 transitions. [2021-11-23 17:39:47,071 INFO L78 Accepts]: Start accepts. Automaton has 31726 states and 38965 transitions. Word has length 140 [2021-11-23 17:39:47,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:47,071 INFO L470 AbstractCegarLoop]: Abstraction has 31726 states and 38965 transitions. [2021-11-23 17:39:47,071 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 22.0) internal successors, (132), 5 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:47,071 INFO L276 IsEmpty]: Start isEmpty. Operand 31726 states and 38965 transitions. [2021-11-23 17:39:47,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:39:47,076 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:47,077 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:47,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:47,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:39:47,277 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:47,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:47,278 INFO L85 PathProgramCache]: Analyzing trace with hash 1494584001, now seen corresponding path program 1 times [2021-11-23 17:39:47,278 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:47,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1155227911] [2021-11-23 17:39:47,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:47,278 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:47,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:47,279 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:47,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (106)] Waiting until timeout for monitored process [2021-11-23 17:39:47,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:47,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:39:47,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:48,649 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 93 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:39:48,649 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:39:48,649 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:48,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1155227911] [2021-11-23 17:39:48,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1155227911] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:39:48,649 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:39:48,649 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:39:48,650 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20041470] [2021-11-23 17:39:48,650 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:39:48,650 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:39:48,650 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:48,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:39:48,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:39:48,651 INFO L87 Difference]: Start difference. First operand 31726 states and 38965 transitions. Second operand has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 5 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:51,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:51,131 INFO L93 Difference]: Finished difference Result 42272 states and 52119 transitions. [2021-11-23 17:39:51,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:39:51,132 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 5 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-23 17:39:51,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:51,176 INFO L225 Difference]: With dead ends: 42272 [2021-11-23 17:39:51,177 INFO L226 Difference]: Without dead ends: 39700 [2021-11-23 17:39:51,186 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:39:51,186 INFO L933 BasicCegarLoop]: 1549 mSDtfsCounter, 1527 mSDsluCounter, 3062 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1527 SdHoareTripleChecker+Valid, 4611 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:51,187 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1527 Valid, 4611 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 37 Unchecked, 0.1s Time] [2021-11-23 17:39:51,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39700 states. [2021-11-23 17:39:54,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39700 to 39526. [2021-11-23 17:39:54,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39526 states, 39524 states have (on average 1.2274061329824917) internal successors, (48512), 39525 states have internal predecessors, (48512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:54,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39526 states to 39526 states and 48512 transitions. [2021-11-23 17:39:54,304 INFO L78 Accepts]: Start accepts. Automaton has 39526 states and 48512 transitions. Word has length 140 [2021-11-23 17:39:54,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:54,304 INFO L470 AbstractCegarLoop]: Abstraction has 39526 states and 48512 transitions. [2021-11-23 17:39:54,304 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 5 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:54,305 INFO L276 IsEmpty]: Start isEmpty. Operand 39526 states and 48512 transitions. [2021-11-23 17:39:54,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:39:54,310 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:54,311 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:54,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (106)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:54,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:39:54,511 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:54,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:54,512 INFO L85 PathProgramCache]: Analyzing trace with hash 1346271750, now seen corresponding path program 1 times [2021-11-23 17:39:54,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:54,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1736671349] [2021-11-23 17:39:54,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:54,512 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:54,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:54,514 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:54,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (107)] Waiting until timeout for monitored process [2021-11-23 17:39:54,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:54,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:39:54,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:56,943 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 56 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:39:56,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:57,733 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 56 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:39:57,734 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:57,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1736671349] [2021-11-23 17:39:57,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1736671349] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:57,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [321473139] [2021-11-23 17:39:57,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:57,734 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:57,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:57,735 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:57,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (108)] Waiting until timeout for monitored process [2021-11-23 17:39:57,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:57,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:39:57,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:00,475 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 56 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:40:00,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:01,047 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 56 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:40:01,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [321473139] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:01,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1473177746] [2021-11-23 17:40:01,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:01,048 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:01,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:40:01,049 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:40:01,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2021-11-23 17:40:01,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:01,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:40:01,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:03,320 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 56 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:40:03,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:03,946 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 56 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:40:03,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1473177746] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:03,946 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:40:03,947 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:40:03,947 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639866083] [2021-11-23 17:40:03,947 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:40:03,948 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:40:03,949 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:40:03,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:40:03,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:40:03,949 INFO L87 Difference]: Start difference. First operand 39526 states and 48512 transitions. Second operand has 16 states, 16 states have (on average 14.5625) internal successors, (233), 15 states have internal predecessors, (233), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:08,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:40:08,466 INFO L93 Difference]: Finished difference Result 56046 states and 69289 transitions. [2021-11-23 17:40:08,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 17:40:08,467 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 14.5625) internal successors, (233), 15 states have internal predecessors, (233), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-23 17:40:08,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:40:08,522 INFO L225 Difference]: With dead ends: 56046 [2021-11-23 17:40:08,522 INFO L226 Difference]: Without dead ends: 47584 [2021-11-23 17:40:08,537 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 852 GetRequests, 824 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=164, Invalid=706, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:40:08,538 INFO L933 BasicCegarLoop]: 1581 mSDtfsCounter, 4696 mSDsluCounter, 12502 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4696 SdHoareTripleChecker+Valid, 14083 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 365 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:40:08,539 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4696 Valid, 14083 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 130 Invalid, 0 Unknown, 365 Unchecked, 0.2s Time] [2021-11-23 17:40:08,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47584 states. [2021-11-23 17:40:11,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47584 to 40635. [2021-11-23 17:40:11,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40635 states, 40633 states have (on average 1.220067432874757) internal successors, (49575), 40634 states have internal predecessors, (49575), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:11,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40635 states to 40635 states and 49575 transitions. [2021-11-23 17:40:11,781 INFO L78 Accepts]: Start accepts. Automaton has 40635 states and 49575 transitions. Word has length 140 [2021-11-23 17:40:11,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:40:11,781 INFO L470 AbstractCegarLoop]: Abstraction has 40635 states and 49575 transitions. [2021-11-23 17:40:11,781 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 14.5625) internal successors, (233), 15 states have internal predecessors, (233), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:11,781 INFO L276 IsEmpty]: Start isEmpty. Operand 40635 states and 49575 transitions. [2021-11-23 17:40:11,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:40:11,788 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:40:11,789 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:40:11,794 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (108)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:12,015 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:12,200 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (107)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:12,389 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:40:12,390 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:40:12,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:40:12,390 INFO L85 PathProgramCache]: Analyzing trace with hash -585933432, now seen corresponding path program 1 times [2021-11-23 17:40:12,390 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:40:12,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [590600220] [2021-11-23 17:40:12,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:12,391 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:40:12,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:40:12,392 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:40:12,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (110)] Waiting until timeout for monitored process [2021-11-23 17:40:12,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:12,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:40:12,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:13,839 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 90 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 17:40:13,839 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:40:13,839 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:40:13,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [590600220] [2021-11-23 17:40:13,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [590600220] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:40:13,840 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:40:13,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:40:13,840 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255341530] [2021-11-23 17:40:13,840 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:40:13,841 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:40:13,841 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:40:13,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:40:13,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:40:13,842 INFO L87 Difference]: Start difference. First operand 40635 states and 49575 transitions. Second operand has 6 states, 6 states have (on average 21.666666666666668) internal successors, (130), 5 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:18,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:40:18,168 INFO L93 Difference]: Finished difference Result 54930 states and 67265 transitions. [2021-11-23 17:40:18,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:40:18,169 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.666666666666668) internal successors, (130), 5 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-23 17:40:18,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:40:18,236 INFO L225 Difference]: With dead ends: 54930 [2021-11-23 17:40:18,236 INFO L226 Difference]: Without dead ends: 53366 [2021-11-23 17:40:18,245 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:40:18,246 INFO L933 BasicCegarLoop]: 1552 mSDtfsCounter, 2972 mSDsluCounter, 3067 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2972 SdHoareTripleChecker+Valid, 4619 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 53 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:40:18,246 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2972 Valid, 4619 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 15 Invalid, 0 Unknown, 53 Unchecked, 0.0s Time] [2021-11-23 17:40:18,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53366 states. [2021-11-23 17:40:22,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53366 to 53066. [2021-11-23 17:40:22,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53066 states, 53064 states have (on average 1.219451982511684) internal successors, (64709), 53065 states have internal predecessors, (64709), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:23,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53066 states to 53066 states and 64709 transitions. [2021-11-23 17:40:23,025 INFO L78 Accepts]: Start accepts. Automaton has 53066 states and 64709 transitions. Word has length 140 [2021-11-23 17:40:23,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:40:23,026 INFO L470 AbstractCegarLoop]: Abstraction has 53066 states and 64709 transitions. [2021-11-23 17:40:23,026 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.666666666666668) internal successors, (130), 5 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:23,027 INFO L276 IsEmpty]: Start isEmpty. Operand 53066 states and 64709 transitions. [2021-11-23 17:40:23,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-23 17:40:23,037 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:40:23,038 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:40:23,062 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (110)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:23,253 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:40:23,254 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:40:23,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:40:23,254 INFO L85 PathProgramCache]: Analyzing trace with hash 721196654, now seen corresponding path program 1 times [2021-11-23 17:40:23,254 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:40:23,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [631747977] [2021-11-23 17:40:23,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:23,255 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:40:23,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:40:23,256 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:40:23,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Waiting until timeout for monitored process [2021-11-23 17:40:23,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:23,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:40:23,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:28,790 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 25 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:28,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:32,191 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 25 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:32,191 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:40:32,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [631747977] [2021-11-23 17:40:32,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [631747977] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:32,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2022373958] [2021-11-23 17:40:32,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:32,192 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:40:32,193 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:40:32,195 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:40:32,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (112)] Waiting until timeout for monitored process [2021-11-23 17:40:32,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:32,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:40:32,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:39,849 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:39,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:44,937 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:44,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2022373958] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:44,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600429346] [2021-11-23 17:40:44,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:44,938 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:44,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:40:44,939 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:40:44,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ff2ce9f6-12c8-4024-a5c4-18baa33abfe2/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Waiting until timeout for monitored process [2021-11-23 17:40:45,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:45,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 17:40:45,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:51,996 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:51,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:53,599 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:53,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1600429346] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:53,599 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:40:53,599 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23, 22, 22, 21] total 103 [2021-11-23 17:40:53,600 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244062608] [2021-11-23 17:40:53,600 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:40:53,600 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2021-11-23 17:40:53,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:40:53,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2021-11-23 17:40:53,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=392, Invalid=10114, Unknown=0, NotChecked=0, Total=10506 [2021-11-23 17:40:53,602 INFO L87 Difference]: Start difference. First operand 53066 states and 64709 transitions. Second operand has 103 states, 103 states have (on average 6.155339805825243) internal successors, (634), 103 states have internal predecessors, (634), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)