./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.BOUNDED-8.pals+Problem12_label04.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_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/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_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.BOUNDED-8.pals+Problem12_label04.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/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_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/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 76db29d9ca8ef7eef9a15a62e4507820e0c810b40a6129bc4bf7f78be54c22c5 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:49:42,995 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:49:43,003 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:49:43,062 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:49:43,063 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:49:43,065 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:49:43,067 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:49:43,070 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:49:43,073 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:49:43,075 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:49:43,077 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:49:43,079 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:49:43,080 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:49:43,082 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:49:43,084 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:49:43,086 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:49:43,088 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:49:43,090 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:49:43,093 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:49:43,097 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:49:43,100 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:49:43,102 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:49:43,104 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:49:43,106 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:49:43,111 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:49:43,112 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:49:43,112 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:49:43,114 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:49:43,115 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:49:43,117 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:49:43,118 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:49:43,119 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:49:43,121 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:49:43,122 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:49:43,124 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:49:43,124 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:49:43,126 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:49:43,126 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:49:43,127 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:49:43,128 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:49:43,129 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:49:43,131 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 16:49:43,165 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:49:43,169 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:49:43,170 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:49:43,170 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:49:43,171 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:49:43,172 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:49:43,172 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:49:43,173 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:49:43,174 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:49:43,174 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 16:49:43,175 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:49:43,176 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:49:43,176 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 16:49:43,177 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 16:49:43,177 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:49:43,178 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 16:49:43,178 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 16:49:43,178 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 16:49:43,179 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:49:43,181 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:49:43,181 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 16:49:43,181 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:49:43,182 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:49:43,182 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:49:43,183 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:49:43,183 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:49:43,185 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:49:43,185 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:49:43,186 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:49:43,186 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:49:43,187 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:49:43,187 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:49:43,187 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:49:43,188 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:49:43,188 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:49:43,189 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:49:43,189 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 16:49:43,189 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 16:49:43,190 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:49:43,190 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:49:43,191 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:49:43,191 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_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 76db29d9ca8ef7eef9a15a62e4507820e0c810b40a6129bc4bf7f78be54c22c5 [2021-11-23 16:49:43,552 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:49:43,580 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:49:43,584 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:49:43,585 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:49:43,587 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:49:43,588 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.BOUNDED-8.pals+Problem12_label04.c [2021-11-23 16:49:43,680 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/data/aae1b5147/9b922f9b96034993a939d370b150c180/FLAG932802289 [2021-11-23 16:49:44,724 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:49:44,726 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.BOUNDED-8.pals+Problem12_label04.c [2021-11-23 16:49:44,770 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/data/aae1b5147/9b922f9b96034993a939d370b150c180/FLAG932802289 [2021-11-23 16:49:45,081 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/data/aae1b5147/9b922f9b96034993a939d370b150c180 [2021-11-23 16:49:45,086 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:49:45,090 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:49:45,094 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:49:45,094 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:49:45,098 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:49:45,098 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:49:45" (1/1) ... [2021-11-23 16:49:45,100 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@846549e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:49:45, skipping insertion in model container [2021-11-23 16:49:45,100 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:49:45" (1/1) ... [2021-11-23 16:49:45,108 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:49:45,266 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:49:45,839 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_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.BOUNDED-8.pals+Problem12_label04.c[8653,8666] [2021-11-23 16:49:45,969 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_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.BOUNDED-8.pals+Problem12_label04.c[15714,15727] [2021-11-23 16:49:47,135 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:49:47,149 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:49:47,212 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_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.BOUNDED-8.pals+Problem12_label04.c[8653,8666] [2021-11-23 16:49:47,230 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_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.BOUNDED-8.pals+Problem12_label04.c[15714,15727] [2021-11-23 16:49:48,066 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:49:48,109 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:49:48,110 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:49:48 WrapperNode [2021-11-23 16:49:48,110 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:49:48,112 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:49:48,112 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:49:48,113 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:49:48,123 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:49:48" (1/1) ... [2021-11-23 16:49:48,221 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:49:48" (1/1) ... [2021-11-23 16:49:48,753 INFO L137 Inliner]: procedures = 34, calls = 20, calls flagged for inlining = 15, calls inlined = 15, statements flattened = 5032 [2021-11-23 16:49:48,753 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:49:48,762 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:49:48,763 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:49:48,763 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:49:48,776 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:49:48" (1/1) ... [2021-11-23 16:49:48,776 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:49:48" (1/1) ... [2021-11-23 16:49:48,864 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:49:48" (1/1) ... [2021-11-23 16:49:48,865 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:49:48" (1/1) ... [2021-11-23 16:49:49,175 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:49:48" (1/1) ... [2021-11-23 16:49:49,270 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:49:48" (1/1) ... [2021-11-23 16:49:49,329 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:49:48" (1/1) ... [2021-11-23 16:49:49,487 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:49:49,488 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:49:49,488 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:49:49,488 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:49:49,494 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:49:48" (1/1) ... [2021-11-23 16:49:49,518 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:49:49,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:49:49,579 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:49:49,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:49:49,698 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:49:49,698 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 16:49:49,698 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:49:49,699 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:49:49,916 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:49:49,918 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:49:55,846 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:49:55,934 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 16:49:55,942 INFO L158 Benchmark]: Toolchain (without parser) took 10848.69ms. Allocated memory was 96.5MB in the beginning and 518.0MB in the end (delta: 421.5MB). Free memory was 65.5MB in the beginning and 273.6MB in the end (delta: -208.2MB). Peak memory consumption was 232.5MB. Max. memory is 16.1GB. [2021-11-23 16:49:55,944 INFO L158 Benchmark]: CDTParser took 0.40ms. Allocated memory is still 96.5MB. Free memory was 66.0MB in the beginning and 66.0MB in the end (delta: 25.3kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:49:55,946 INFO L158 Benchmark]: CACSL2BoogieTranslator took 3017.21ms. Allocated memory was 96.5MB in the beginning and 163.6MB in the end (delta: 67.1MB). Free memory was 65.5MB in the beginning and 93.0MB in the end (delta: -27.6MB). Peak memory consumption was 67.5MB. Max. memory is 16.1GB. [2021-11-23 16:49:55,947 INFO L158 Benchmark]: Boogie Procedure Inliner took 641.59ms. Allocated memory is still 163.6MB. Free memory was 93.0MB in the beginning and 70.3MB in the end (delta: 22.8MB). Peak memory consumption was 72.7MB. Max. memory is 16.1GB. [2021-11-23 16:49:55,949 INFO L158 Benchmark]: Boogie Preprocessor took 724.38ms. Allocated memory is still 163.6MB. Free memory was 70.3MB in the beginning and 44.8MB in the end (delta: 25.5MB). Peak memory consumption was 33.6MB. Max. memory is 16.1GB. [2021-11-23 16:49:55,951 INFO L158 Benchmark]: RCFGBuilder took 6449.54ms. Allocated memory was 163.6MB in the beginning and 518.0MB in the end (delta: 354.4MB). Free memory was 44.8MB in the beginning and 273.6MB in the end (delta: -228.8MB). Peak memory consumption was 146.8MB. Max. memory is 16.1GB. [2021-11-23 16:49:55,963 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.40ms. Allocated memory is still 96.5MB. Free memory was 66.0MB in the beginning and 66.0MB in the end (delta: 25.3kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 3017.21ms. Allocated memory was 96.5MB in the beginning and 163.6MB in the end (delta: 67.1MB). Free memory was 65.5MB in the beginning and 93.0MB in the end (delta: -27.6MB). Peak memory consumption was 67.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 641.59ms. Allocated memory is still 163.6MB. Free memory was 93.0MB in the beginning and 70.3MB in the end (delta: 22.8MB). Peak memory consumption was 72.7MB. Max. memory is 16.1GB. * Boogie Preprocessor took 724.38ms. Allocated memory is still 163.6MB. Free memory was 70.3MB in the beginning and 44.8MB in the end (delta: 25.5MB). Peak memory consumption was 33.6MB. Max. memory is 16.1GB. * RCFGBuilder took 6449.54ms. Allocated memory was 163.6MB in the beginning and 518.0MB in the end (delta: 354.4MB). Free memory was 44.8MB in the beginning and 273.6MB in the end (delta: -228.8MB). Peak memory consumption was 146.8MB. 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 16:49:55,997 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/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_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/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_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.BOUNDED-8.pals+Problem12_label04.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/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_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/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 76db29d9ca8ef7eef9a15a62e4507820e0c810b40a6129bc4bf7f78be54c22c5 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:49:58,997 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:49:59,000 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:49:59,053 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:49:59,054 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:49:59,059 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:49:59,061 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:49:59,071 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:49:59,075 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:49:59,085 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:49:59,087 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:49:59,090 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:49:59,090 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:49:59,094 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:49:59,098 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:49:59,103 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:49:59,105 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:49:59,106 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:49:59,109 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:49:59,119 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:49:59,122 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:49:59,123 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:49:59,127 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:49:59,130 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:49:59,142 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:49:59,142 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:49:59,143 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:49:59,145 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:49:59,146 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:49:59,148 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:49:59,149 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:49:59,150 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:49:59,153 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:49:59,154 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:49:59,156 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:49:59,156 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:49:59,158 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:49:59,158 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:49:59,158 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:49:59,161 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:49:59,162 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:49:59,163 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 16:49:59,214 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:49:59,215 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:49:59,215 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:49:59,215 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:49:59,216 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:49:59,217 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:49:59,217 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:49:59,217 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:49:59,218 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:49:59,218 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:49:59,218 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:49:59,218 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:49:59,219 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:49:59,220 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:49:59,220 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:49:59,220 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:49:59,221 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:49:59,221 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:49:59,221 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:49:59,221 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 16:49:59,222 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 16:49:59,222 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 16:49:59,222 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:49:59,222 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:49:59,223 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:49:59,223 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:49:59,223 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:49:59,224 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 16:49:59,224 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:49:59,224 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:49:59,225 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:49:59,225 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:49:59,225 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:49:59,225 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 16:49:59,226 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 16:49:59,226 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:49:59,226 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:49:59,227 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:49:59,227 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_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 76db29d9ca8ef7eef9a15a62e4507820e0c810b40a6129bc4bf7f78be54c22c5 [2021-11-23 16:49:59,686 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:49:59,719 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:49:59,722 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:49:59,724 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:49:59,725 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:49:59,727 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.BOUNDED-8.pals+Problem12_label04.c [2021-11-23 16:49:59,820 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/data/989290fa5/b26b09cd6ff449ff888f1fc54457e2a1/FLAG111b54e7f [2021-11-23 16:50:01,028 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:50:01,030 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.BOUNDED-8.pals+Problem12_label04.c [2021-11-23 16:50:01,078 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/data/989290fa5/b26b09cd6ff449ff888f1fc54457e2a1/FLAG111b54e7f [2021-11-23 16:50:01,424 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/data/989290fa5/b26b09cd6ff449ff888f1fc54457e2a1 [2021-11-23 16:50:01,427 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:50:01,428 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:50:01,430 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:50:01,431 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:50:01,435 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:50:01,436 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:50:01" (1/1) ... [2021-11-23 16:50:01,438 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@15cc9372 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:01, skipping insertion in model container [2021-11-23 16:50:01,438 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:50:01" (1/1) ... [2021-11-23 16:50:01,447 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:50:01,638 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:50:02,242 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_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.BOUNDED-8.pals+Problem12_label04.c[8653,8666] [2021-11-23 16:50:02,341 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_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.BOUNDED-8.pals+Problem12_label04.c[15714,15727] [2021-11-23 16:50:03,731 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:50:03,749 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:50:03,823 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_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.BOUNDED-8.pals+Problem12_label04.c[8653,8666] [2021-11-23 16:50:03,849 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_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/sv-benchmarks/c/combinations/pals_lcr.4.1.ufo.BOUNDED-8.pals+Problem12_label04.c[15714,15727] [2021-11-23 16:50:04,714 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:50:04,758 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:50:04,758 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:04 WrapperNode [2021-11-23 16:50:04,758 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:50:04,760 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:50:04,760 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:50:04,760 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:50:04,769 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:04" (1/1) ... [2021-11-23 16:50:04,874 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:04" (1/1) ... [2021-11-23 16:50:05,117 INFO L137 Inliner]: procedures = 35, calls = 20, calls flagged for inlining = 15, calls inlined = 15, statements flattened = 5010 [2021-11-23 16:50:05,118 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:50:05,120 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:50:05,121 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:50:05,121 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:50:05,132 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:04" (1/1) ... [2021-11-23 16:50:05,132 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:04" (1/1) ... [2021-11-23 16:50:05,182 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:04" (1/1) ... [2021-11-23 16:50:05,197 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:04" (1/1) ... [2021-11-23 16:50:05,391 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:04" (1/1) ... [2021-11-23 16:50:05,531 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:04" (1/1) ... [2021-11-23 16:50:05,621 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:04" (1/1) ... [2021-11-23 16:50:05,663 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:50:05,665 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:50:05,666 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:50:05,666 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:50:05,667 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:04" (1/1) ... [2021-11-23 16:50:05,677 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:50:05,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:50:05,727 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:50:05,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:50:05,874 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:50:05,875 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 16:50:05,875 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:50:05,875 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:50:06,087 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:50:06,090 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:50:39,737 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:50:39,765 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 16:50:39,766 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 16:50:39,770 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:50:39 BoogieIcfgContainer [2021-11-23 16:50:39,771 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 16:50:39,773 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 16:50:39,774 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 16:50:39,777 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 16:50:39,778 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 04:50:01" (1/3) ... [2021-11-23 16:50:39,779 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4bff832c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:50:39, skipping insertion in model container [2021-11-23 16:50:39,779 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:50:04" (2/3) ... [2021-11-23 16:50:39,780 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4bff832c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:50:39, skipping insertion in model container [2021-11-23 16:50:39,780 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:50:39" (3/3) ... [2021-11-23 16:50:39,782 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.4.1.ufo.BOUNDED-8.pals+Problem12_label04.c [2021-11-23 16:50:39,789 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 16:50:39,789 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 16:50:39,859 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 16:50:39,868 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 16:50:39,869 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 16:50:39,918 INFO L276 IsEmpty]: Start isEmpty. Operand has 893 states, 890 states have (on average 1.902247191011236) internal successors, (1693), 892 states have internal predecessors, (1693), 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 16:50:39,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 16:50:39,929 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:39,930 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 16:50:39,931 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:39,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:39,938 INFO L85 PathProgramCache]: Analyzing trace with hash 1675876582, now seen corresponding path program 1 times [2021-11-23 16:50:39,951 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:39,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [244859149] [2021-11-23 16:50:39,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:39,953 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:39,954 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:39,955 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:39,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 16:50:40,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:40,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 16:50:40,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:40,273 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 16:50:40,273 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:40,274 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:40,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [244859149] [2021-11-23 16:50:40,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [244859149] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:40,276 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:40,276 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:50:40,278 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002351843] [2021-11-23 16:50:40,284 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:40,289 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 16:50:40,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:40,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 16:50:40,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 16:50:40,374 INFO L87 Difference]: Start difference. First operand has 893 states, 890 states have (on average 1.902247191011236) internal successors, (1693), 892 states have internal predecessors, (1693), 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 2 states, 2 states have (on average 15.0) internal successors, (30), 2 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 16:50:40,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:40,543 INFO L93 Difference]: Finished difference Result 1757 states and 3332 transitions. [2021-11-23 16:50:40,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 16:50:40,546 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 15.0) internal successors, (30), 2 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 16:50:40,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:40,580 INFO L225 Difference]: With dead ends: 1757 [2021-11-23 16:50:40,580 INFO L226 Difference]: Without dead ends: 827 [2021-11-23 16:50:40,588 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 16:50:40,592 INFO L933 BasicCegarLoop]: 1627 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 1627 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:40,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1627 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:50:40,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 827 states. [2021-11-23 16:50:40,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 827 to 827. [2021-11-23 16:50:40,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 827 states, 825 states have (on average 1.8909090909090909) internal successors, (1560), 826 states have internal predecessors, (1560), 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 16:50:40,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 827 states to 827 states and 1560 transitions. [2021-11-23 16:50:40,713 INFO L78 Accepts]: Start accepts. Automaton has 827 states and 1560 transitions. Word has length 30 [2021-11-23 16:50:40,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:40,714 INFO L470 AbstractCegarLoop]: Abstraction has 827 states and 1560 transitions. [2021-11-23 16:50:40,714 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 15.0) internal successors, (30), 2 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 16:50:40,714 INFO L276 IsEmpty]: Start isEmpty. Operand 827 states and 1560 transitions. [2021-11-23 16:50:40,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 16:50:40,718 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:40,719 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 16:50:40,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:40,934 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:40,935 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:40,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:40,936 INFO L85 PathProgramCache]: Analyzing trace with hash 1541863076, now seen corresponding path program 1 times [2021-11-23 16:50:40,936 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:40,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [131162211] [2021-11-23 16:50:40,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:40,937 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:40,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:40,941 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:40,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 16:50:41,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:41,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:50:41,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:41,226 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 16:50:41,226 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:41,226 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:41,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [131162211] [2021-11-23 16:50:41,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [131162211] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:41,227 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:41,228 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:50:41,228 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555189068] [2021-11-23 16:50:41,228 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:41,230 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:50:41,231 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:41,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:50:41,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:50:41,232 INFO L87 Difference]: Start difference. First operand 827 states and 1560 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 16:50:41,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:41,577 INFO L93 Difference]: Finished difference Result 919 states and 1702 transitions. [2021-11-23 16:50:41,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:50:41,578 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 16:50:41,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:41,587 INFO L225 Difference]: With dead ends: 919 [2021-11-23 16:50:41,587 INFO L226 Difference]: Without dead ends: 871 [2021-11-23 16:50:41,588 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 16:50:41,590 INFO L933 BasicCegarLoop]: 1556 mSDtfsCounter, 71 mSDsluCounter, 4640 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 6196 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:41,591 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 6196 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:50:41,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 871 states. [2021-11-23 16:50:41,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 871 to 827. [2021-11-23 16:50:41,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 827 states, 825 states have (on average 1.863030303030303) internal successors, (1537), 826 states have internal predecessors, (1537), 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 16:50:41,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 827 states to 827 states and 1537 transitions. [2021-11-23 16:50:41,658 INFO L78 Accepts]: Start accepts. Automaton has 827 states and 1537 transitions. Word has length 30 [2021-11-23 16:50:41,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:41,662 INFO L470 AbstractCegarLoop]: Abstraction has 827 states and 1537 transitions. [2021-11-23 16:50:41,662 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 16:50:41,662 INFO L276 IsEmpty]: Start isEmpty. Operand 827 states and 1537 transitions. [2021-11-23 16:50:41,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 16:50:41,673 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:41,673 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 16:50:41,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:41,888 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:41,888 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:41,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:41,889 INFO L85 PathProgramCache]: Analyzing trace with hash 159296799, now seen corresponding path program 1 times [2021-11-23 16:50:41,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:41,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [424830193] [2021-11-23 16:50:41,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:41,890 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:41,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:41,892 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:41,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 16:50:41,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:41,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:50:41,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:42,250 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 16:50:42,251 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:42,251 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:42,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [424830193] [2021-11-23 16:50:42,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [424830193] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:42,252 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:42,252 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:50:42,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802504080] [2021-11-23 16:50:42,253 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:42,254 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:50:42,254 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:42,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:50:42,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:50:42,255 INFO L87 Difference]: Start difference. First operand 827 states and 1537 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 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 16:50:42,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:42,371 INFO L93 Difference]: Finished difference Result 909 states and 1665 transitions. [2021-11-23 16:50:42,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:50:42,372 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 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 16:50:42,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:42,382 INFO L225 Difference]: With dead ends: 909 [2021-11-23 16:50:42,382 INFO L226 Difference]: Without dead ends: 865 [2021-11-23 16:50:42,383 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 50 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 16:50:42,388 INFO L933 BasicCegarLoop]: 1592 mSDtfsCounter, 1498 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1498 SdHoareTripleChecker+Valid, 1659 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 16:50:42,391 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1498 Valid, 1659 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:50:42,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 865 states. [2021-11-23 16:50:42,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 865 to 863. [2021-11-23 16:50:42,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 863 states, 861 states have (on average 1.8513356562137049) internal successors, (1594), 862 states have internal predecessors, (1594), 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 16:50:42,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 863 states to 863 states and 1594 transitions. [2021-11-23 16:50:42,429 INFO L78 Accepts]: Start accepts. Automaton has 863 states and 1594 transitions. Word has length 52 [2021-11-23 16:50:42,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:42,429 INFO L470 AbstractCegarLoop]: Abstraction has 863 states and 1594 transitions. [2021-11-23 16:50:42,430 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 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 16:50:42,430 INFO L276 IsEmpty]: Start isEmpty. Operand 863 states and 1594 transitions. [2021-11-23 16:50:42,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 16:50:42,433 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:42,435 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 16:50:42,450 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:42,649 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:42,650 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:42,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:42,651 INFO L85 PathProgramCache]: Analyzing trace with hash -1780734059, now seen corresponding path program 1 times [2021-11-23 16:50:42,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:42,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1269771283] [2021-11-23 16:50:42,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:42,652 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:42,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:42,653 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:42,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 16:50:42,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:42,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:50:42,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:43,004 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 16:50:43,004 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:43,005 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:43,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1269771283] [2021-11-23 16:50:43,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1269771283] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:43,005 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:43,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:50:43,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988214620] [2021-11-23 16:50:43,006 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:43,007 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:50:43,007 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:43,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:50:43,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:50:43,008 INFO L87 Difference]: Start difference. First operand 863 states and 1594 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 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 16:50:43,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:43,073 INFO L93 Difference]: Finished difference Result 1011 states and 1826 transitions. [2021-11-23 16:50:43,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:50:43,074 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 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 16:50:43,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:43,082 INFO L225 Difference]: With dead ends: 1011 [2021-11-23 16:50:43,082 INFO L226 Difference]: Without dead ends: 931 [2021-11-23 16:50:43,088 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 50 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 16:50:43,092 INFO L933 BasicCegarLoop]: 1587 mSDtfsCounter, 1494 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1494 SdHoareTripleChecker+Valid, 1658 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 16:50:43,093 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1494 Valid, 1658 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:50:43,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 931 states. [2021-11-23 16:50:43,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 931 to 929. [2021-11-23 16:50:43,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 929 states, 927 states have (on average 1.8306364617044228) internal successors, (1697), 928 states have internal predecessors, (1697), 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 16:50:43,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 929 states to 929 states and 1697 transitions. [2021-11-23 16:50:43,143 INFO L78 Accepts]: Start accepts. Automaton has 929 states and 1697 transitions. Word has length 52 [2021-11-23 16:50:43,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:43,144 INFO L470 AbstractCegarLoop]: Abstraction has 929 states and 1697 transitions. [2021-11-23 16:50:43,145 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 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 16:50:43,145 INFO L276 IsEmpty]: Start isEmpty. Operand 929 states and 1697 transitions. [2021-11-23 16:50:43,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 16:50:43,146 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:43,146 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 16:50:43,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:43,361 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:43,362 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:43,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:43,362 INFO L85 PathProgramCache]: Analyzing trace with hash 919948555, now seen corresponding path program 1 times [2021-11-23 16:50:43,363 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:43,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [486653737] [2021-11-23 16:50:43,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:43,364 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:43,364 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:43,365 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:43,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 16:50:43,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:43,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:50:43,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:43,673 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 16:50:43,674 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:43,674 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:43,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [486653737] [2021-11-23 16:50:43,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [486653737] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:43,675 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:43,675 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:50:43,675 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131069184] [2021-11-23 16:50:43,675 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:43,676 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:50:43,676 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:43,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:50:43,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:50:43,677 INFO L87 Difference]: Start difference. First operand 929 states and 1697 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 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 16:50:43,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:43,737 INFO L93 Difference]: Finished difference Result 1197 states and 2115 transitions. [2021-11-23 16:50:43,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:50:43,738 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 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 16:50:43,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:43,747 INFO L225 Difference]: With dead ends: 1197 [2021-11-23 16:50:43,748 INFO L226 Difference]: Without dead ends: 1051 [2021-11-23 16:50:43,749 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 50 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 16:50:43,750 INFO L933 BasicCegarLoop]: 1582 mSDtfsCounter, 1490 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1490 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 16:50:43,751 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1490 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 16:50:43,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1051 states. [2021-11-23 16:50:43,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1051 to 1049. [2021-11-23 16:50:43,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1049 states, 1047 states have (on average 1.7965616045845272) internal successors, (1881), 1048 states have internal predecessors, (1881), 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 16:50:43,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1049 states to 1049 states and 1881 transitions. [2021-11-23 16:50:43,797 INFO L78 Accepts]: Start accepts. Automaton has 1049 states and 1881 transitions. Word has length 52 [2021-11-23 16:50:43,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:43,798 INFO L470 AbstractCegarLoop]: Abstraction has 1049 states and 1881 transitions. [2021-11-23 16:50:43,798 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 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 16:50:43,798 INFO L276 IsEmpty]: Start isEmpty. Operand 1049 states and 1881 transitions. [2021-11-23 16:50:43,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 16:50:43,801 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:43,801 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 16:50:43,821 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:44,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:44,017 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:44,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:44,018 INFO L85 PathProgramCache]: Analyzing trace with hash 1515907135, now seen corresponding path program 1 times [2021-11-23 16:50:44,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:44,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [895293728] [2021-11-23 16:50:44,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:44,019 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:44,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:44,022 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:44,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 16:50:44,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:44,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:50:44,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:45,194 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 16:50:45,196 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:45,196 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:45,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [895293728] [2021-11-23 16:50:45,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [895293728] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:45,197 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:45,197 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:50:45,197 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773423218] [2021-11-23 16:50:45,198 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:45,199 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:50:45,201 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:45,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:50:45,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:50:45,202 INFO L87 Difference]: Start difference. First operand 1049 states and 1881 transitions. Second operand has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 5 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 16:50:45,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:45,450 INFO L93 Difference]: Finished difference Result 1326 states and 2308 transitions. [2021-11-23 16:50:45,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:50:45,451 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 5 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 16:50:45,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:45,461 INFO L225 Difference]: With dead ends: 1326 [2021-11-23 16:50:45,462 INFO L226 Difference]: Without dead ends: 1060 [2021-11-23 16:50:45,463 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 47 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 16:50:45,467 INFO L933 BasicCegarLoop]: 1526 mSDtfsCounter, 1458 mSDsluCounter, 1604 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1458 SdHoareTripleChecker+Valid, 3130 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:45,468 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1458 Valid, 3130 Invalid, 74 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 33 Unchecked, 0.1s Time] [2021-11-23 16:50:45,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1060 states. [2021-11-23 16:50:45,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1060 to 1060. [2021-11-23 16:50:45,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1060 states, 1058 states have (on average 1.7901701323251418) internal successors, (1894), 1059 states have internal predecessors, (1894), 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 16:50:45,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1060 states to 1060 states and 1894 transitions. [2021-11-23 16:50:45,521 INFO L78 Accepts]: Start accepts. Automaton has 1060 states and 1894 transitions. Word has length 52 [2021-11-23 16:50:45,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:45,522 INFO L470 AbstractCegarLoop]: Abstraction has 1060 states and 1894 transitions. [2021-11-23 16:50:45,522 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 5 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 16:50:45,522 INFO L276 IsEmpty]: Start isEmpty. Operand 1060 states and 1894 transitions. [2021-11-23 16:50:45,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 16:50:45,523 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:45,524 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 16:50:45,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:45,740 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:45,740 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:45,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:45,741 INFO L85 PathProgramCache]: Analyzing trace with hash 1257741697, now seen corresponding path program 1 times [2021-11-23 16:50:45,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:45,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1568638509] [2021-11-23 16:50:45,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:45,742 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:45,742 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:45,743 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:45,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 16:50:45,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:45,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:50:45,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:46,075 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 16:50:46,075 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:46,076 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:46,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1568638509] [2021-11-23 16:50:46,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1568638509] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:46,076 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:46,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:50:46,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174575596] [2021-11-23 16:50:46,077 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:46,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:50:46,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:46,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:50:46,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:50:46,079 INFO L87 Difference]: Start difference. First operand 1060 states and 1894 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 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 16:50:46,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:46,159 INFO L93 Difference]: Finished difference Result 1544 states and 2640 transitions. [2021-11-23 16:50:46,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:50:46,160 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 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 16:50:46,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:46,173 INFO L225 Difference]: With dead ends: 1544 [2021-11-23 16:50:46,174 INFO L226 Difference]: Without dead ends: 1278 [2021-11-23 16:50:46,175 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 50 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 16:50:46,177 INFO L933 BasicCegarLoop]: 1577 mSDtfsCounter, 1486 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1486 SdHoareTripleChecker+Valid, 1656 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 16:50:46,177 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1486 Valid, 1656 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:50:46,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1278 states. [2021-11-23 16:50:46,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1278 to 1276. [2021-11-23 16:50:46,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1276 states, 1274 states have (on average 1.7409733124018838) internal successors, (2218), 1275 states have internal predecessors, (2218), 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 16:50:46,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1276 states to 1276 states and 2218 transitions. [2021-11-23 16:50:46,246 INFO L78 Accepts]: Start accepts. Automaton has 1276 states and 2218 transitions. Word has length 52 [2021-11-23 16:50:46,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:46,248 INFO L470 AbstractCegarLoop]: Abstraction has 1276 states and 2218 transitions. [2021-11-23 16:50:46,248 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 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 16:50:46,248 INFO L276 IsEmpty]: Start isEmpty. Operand 1276 states and 2218 transitions. [2021-11-23 16:50:46,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 16:50:46,249 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:46,250 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 16:50:46,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:46,466 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:46,466 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:46,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:46,467 INFO L85 PathProgramCache]: Analyzing trace with hash 1666380469, now seen corresponding path program 1 times [2021-11-23 16:50:46,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:46,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [610311369] [2021-11-23 16:50:46,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:46,468 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:46,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:46,469 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:46,472 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 16:50:46,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:46,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:50:46,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:47,392 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 16:50:47,392 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:47,393 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:47,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [610311369] [2021-11-23 16:50:47,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [610311369] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:47,393 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:47,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:50:47,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565773963] [2021-11-23 16:50:47,394 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:47,394 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:50:47,394 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:47,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:50:47,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:50:47,395 INFO L87 Difference]: Start difference. First operand 1276 states and 2218 transitions. Second operand has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 5 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 16:50:47,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:47,557 INFO L93 Difference]: Finished difference Result 1762 states and 2960 transitions. [2021-11-23 16:50:47,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:50:47,558 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 5 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 16:50:47,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:47,568 INFO L225 Difference]: With dead ends: 1762 [2021-11-23 16:50:47,568 INFO L226 Difference]: Without dead ends: 1280 [2021-11-23 16:50:47,570 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 47 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 16:50:47,571 INFO L933 BasicCegarLoop]: 1524 mSDtfsCounter, 2907 mSDsluCounter, 1531 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2907 SdHoareTripleChecker+Valid, 3055 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 17 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:47,571 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2907 Valid, 3055 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 17 Unchecked, 0.0s Time] [2021-11-23 16:50:47,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1280 states. [2021-11-23 16:50:47,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1280 to 1280. [2021-11-23 16:50:47,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1280 states, 1278 states have (on average 1.7386541471048513) internal successors, (2222), 1279 states have internal predecessors, (2222), 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 16:50:47,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1280 states to 1280 states and 2222 transitions. [2021-11-23 16:50:47,627 INFO L78 Accepts]: Start accepts. Automaton has 1280 states and 2222 transitions. Word has length 52 [2021-11-23 16:50:47,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:47,628 INFO L470 AbstractCegarLoop]: Abstraction has 1280 states and 2222 transitions. [2021-11-23 16:50:47,628 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.666666666666666) internal successors, (52), 5 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 16:50:47,629 INFO L276 IsEmpty]: Start isEmpty. Operand 1280 states and 2222 transitions. [2021-11-23 16:50:47,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 16:50:47,629 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:47,630 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 16:50:47,650 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Ended with exit code 0 [2021-11-23 16:50:47,845 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:47,845 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:47,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:47,846 INFO L85 PathProgramCache]: Analyzing trace with hash -1819240201, now seen corresponding path program 1 times [2021-11-23 16:50:47,846 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:47,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [35401202] [2021-11-23 16:50:47,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:47,847 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:47,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:47,849 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:47,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 16:50:47,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:47,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:50:47,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:48,970 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 16:50:48,970 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:48,971 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:48,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [35401202] [2021-11-23 16:50:48,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [35401202] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:48,971 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:48,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 16:50:48,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085225939] [2021-11-23 16:50:48,972 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:48,973 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:50:48,973 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:48,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:50:48,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:50:48,975 INFO L87 Difference]: Start difference. First operand 1280 states and 2222 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 16:50:49,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:49,359 INFO L93 Difference]: Finished difference Result 3690 states and 5907 transitions. [2021-11-23 16:50:49,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:50:49,360 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 16:50:49,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:49,384 INFO L225 Difference]: With dead ends: 3690 [2021-11-23 16:50:49,384 INFO L226 Difference]: Without dead ends: 3208 [2021-11-23 16:50:49,386 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 16:50:49,387 INFO L933 BasicCegarLoop]: 1531 mSDtfsCounter, 3213 mSDsluCounter, 296 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3213 SdHoareTripleChecker+Valid, 1827 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:49,388 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3213 Valid, 1827 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 16:50:49,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3208 states. [2021-11-23 16:50:49,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3208 to 2240. [2021-11-23 16:50:49,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2240 states, 2238 states have (on average 1.6291331546023236) internal successors, (3646), 2239 states have internal predecessors, (3646), 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 16:50:49,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2240 states to 2240 states and 3646 transitions. [2021-11-23 16:50:49,518 INFO L78 Accepts]: Start accepts. Automaton has 2240 states and 3646 transitions. Word has length 52 [2021-11-23 16:50:49,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:49,519 INFO L470 AbstractCegarLoop]: Abstraction has 2240 states and 3646 transitions. [2021-11-23 16:50:49,519 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 16:50:49,519 INFO L276 IsEmpty]: Start isEmpty. Operand 2240 states and 3646 transitions. [2021-11-23 16:50:49,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 16:50:49,520 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:49,520 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 16:50:49,536 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:49,736 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:49,736 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:49,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:49,737 INFO L85 PathProgramCache]: Analyzing trace with hash -1653841945, now seen corresponding path program 1 times [2021-11-23 16:50:49,737 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:49,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [304491911] [2021-11-23 16:50:49,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:49,738 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:49,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:49,740 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:49,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 16:50:49,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:49,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:50:49,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:50,099 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 16:50:50,100 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:50,100 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:50,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [304491911] [2021-11-23 16:50:50,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [304491911] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:50,100 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:50,101 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:50:50,101 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693334733] [2021-11-23 16:50:50,101 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:50,101 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:50:50,102 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:50,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:50:50,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:50:50,103 INFO L87 Difference]: Start difference. First operand 2240 states and 3646 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 16:50:50,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:50,254 INFO L93 Difference]: Finished difference Result 4348 states and 6796 transitions. [2021-11-23 16:50:50,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:50:50,255 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 16:50:50,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:50,277 INFO L225 Difference]: With dead ends: 4348 [2021-11-23 16:50:50,277 INFO L226 Difference]: Without dead ends: 2906 [2021-11-23 16:50:50,281 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 16:50:50,282 INFO L933 BasicCegarLoop]: 1560 mSDtfsCounter, 1478 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1478 SdHoareTripleChecker+Valid, 1624 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:50,282 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1478 Valid, 1624 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:50:50,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2906 states. [2021-11-23 16:50:50,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2906 to 2904. [2021-11-23 16:50:50,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2904 states, 2902 states have (on average 1.5830461750516884) internal successors, (4594), 2903 states have internal predecessors, (4594), 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 16:50:50,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2904 states to 2904 states and 4594 transitions. [2021-11-23 16:50:50,440 INFO L78 Accepts]: Start accepts. Automaton has 2904 states and 4594 transitions. Word has length 54 [2021-11-23 16:50:50,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:50,440 INFO L470 AbstractCegarLoop]: Abstraction has 2904 states and 4594 transitions. [2021-11-23 16:50:50,441 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 16:50:50,441 INFO L276 IsEmpty]: Start isEmpty. Operand 2904 states and 4594 transitions. [2021-11-23 16:50:50,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 16:50:50,442 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:50,442 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 16:50:50,462 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:50,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:50,657 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:50,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:50,658 INFO L85 PathProgramCache]: Analyzing trace with hash 1917083004, now seen corresponding path program 1 times [2021-11-23 16:50:50,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:50,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1984113581] [2021-11-23 16:50:50,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:50,660 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:50,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:50,661 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:50,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 16:50:50,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:50,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:50:50,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:50,910 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 16:50:50,911 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:50,911 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:50,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1984113581] [2021-11-23 16:50:50,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1984113581] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:50,912 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:50,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:50:50,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357991661] [2021-11-23 16:50:50,913 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:50,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 16:50:50,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:50,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 16:50:50,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 16:50:50,914 INFO L87 Difference]: Start difference. First operand 2904 states and 4594 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 16:50:51,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:50:51,276 INFO L93 Difference]: Finished difference Result 4863 states and 7383 transitions. [2021-11-23 16:50:51,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:50:51,278 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 16:50:51,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:50:51,312 INFO L225 Difference]: With dead ends: 4863 [2021-11-23 16:50:51,312 INFO L226 Difference]: Without dead ends: 4861 [2021-11-23 16:50:51,315 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 16:50:51,316 INFO L933 BasicCegarLoop]: 1559 mSDtfsCounter, 178 mSDsluCounter, 4604 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 6163 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:50:51,316 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 6163 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:50:51,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4861 states. [2021-11-23 16:50:51,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4861 to 3072. [2021-11-23 16:50:51,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3072 states, 3070 states have (on average 1.5485342019543975) internal successors, (4754), 3071 states have internal predecessors, (4754), 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 16:50:51,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3072 states to 3072 states and 4754 transitions. [2021-11-23 16:50:51,534 INFO L78 Accepts]: Start accepts. Automaton has 3072 states and 4754 transitions. Word has length 55 [2021-11-23 16:50:51,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:50:51,534 INFO L470 AbstractCegarLoop]: Abstraction has 3072 states and 4754 transitions. [2021-11-23 16:50:51,534 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 16:50:51,535 INFO L276 IsEmpty]: Start isEmpty. Operand 3072 states and 4754 transitions. [2021-11-23 16:50:51,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 16:50:51,536 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:50:51,536 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, 1, 1, 1, 1, 1] [2021-11-23 16:50:51,552 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 16:50:51,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:50:51,752 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:50:51,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:50:51,753 INFO L85 PathProgramCache]: Analyzing trace with hash -1641000780, now seen corresponding path program 1 times [2021-11-23 16:50:51,754 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:50:51,754 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [876460139] [2021-11-23 16:50:51,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:50:51,755 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:50:51,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:50:51,756 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:50:51,781 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 16:50:51,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:50:51,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:50:51,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:50:52,148 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 16:50:52,149 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:50:52,149 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:50:52,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [876460139] [2021-11-23 16:50:52,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [876460139] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:50:52,150 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:50:52,150 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:50:52,150 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786797417] [2021-11-23 16:50:52,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:50:52,150 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:50:52,151 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:50:52,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:50:52,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:50:52,151 INFO L87 Difference]: Start difference. First operand 3072 states and 4754 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 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 16:51:33,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:33,565 INFO L93 Difference]: Finished difference Result 4576 states and 7627 transitions. [2021-11-23 16:51:33,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:51:33,568 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 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 61 [2021-11-23 16:51:33,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:33,594 INFO L225 Difference]: With dead ends: 4576 [2021-11-23 16:51:33,595 INFO L226 Difference]: Without dead ends: 3823 [2021-11-23 16:51:33,598 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 59 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 16:51:33,599 INFO L933 BasicCegarLoop]: 315 mSDtfsCounter, 816 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2464 mSolverCounterSat, 512 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 34.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 816 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 2976 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 512 IncrementalHoareTripleChecker+Valid, 2464 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 41.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:33,599 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [816 Valid, 322 Invalid, 2976 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [512 Valid, 2464 Invalid, 0 Unknown, 0 Unchecked, 41.1s Time] [2021-11-23 16:51:33,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3823 states. [2021-11-23 16:51:33,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3823 to 3823. [2021-11-23 16:51:33,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3823 states, 3821 states have (on average 1.5663438890342842) internal successors, (5985), 3822 states have internal predecessors, (5985), 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 16:51:33,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3823 states to 3823 states and 5985 transitions. [2021-11-23 16:51:33,858 INFO L78 Accepts]: Start accepts. Automaton has 3823 states and 5985 transitions. Word has length 61 [2021-11-23 16:51:33,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:33,858 INFO L470 AbstractCegarLoop]: Abstraction has 3823 states and 5985 transitions. [2021-11-23 16:51:33,859 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 2 states have internal predecessors, (61), 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 16:51:33,859 INFO L276 IsEmpty]: Start isEmpty. Operand 3823 states and 5985 transitions. [2021-11-23 16:51:33,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 16:51:33,862 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:33,862 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] [2021-11-23 16:51:33,882 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:34,077 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:34,077 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:34,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:34,078 INFO L85 PathProgramCache]: Analyzing trace with hash -484645446, now seen corresponding path program 1 times [2021-11-23 16:51:34,079 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:34,079 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [460012279] [2021-11-23 16:51:34,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:34,079 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:34,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:34,081 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:34,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 16:51:34,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:34,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:34,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:35,649 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 16:51:35,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:36,810 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 16:51:36,810 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:36,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [460012279] [2021-11-23 16:51:36,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [460012279] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:36,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1031997036] [2021-11-23 16:51:36,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:36,811 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:36,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:51:36,814 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:51:36,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-23 16:51:37,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:37,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:37,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:38,152 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 16:51:38,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:39,028 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 16:51:39,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1031997036] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:39,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [432240845] [2021-11-23 16:51:39,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:39,029 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:39,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:51:39,031 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:51:39,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 16:51:39,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:39,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:39,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:40,267 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 16:51:40,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:41,090 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 16:51:41,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [432240845] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:41,090 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:51:41,091 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:51:41,091 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272060781] [2021-11-23 16:51:41,091 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:51:41,092 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:51:41,092 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:41,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:51:41,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:51:41,094 INFO L87 Difference]: Start difference. First operand 3823 states and 5985 transitions. Second operand has 16 states, 16 states have (on average 8.5625) internal successors, (137), 15 states have internal predecessors, (137), 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 16:51:41,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:41,721 INFO L93 Difference]: Finished difference Result 5423 states and 8307 transitions. [2021-11-23 16:51:41,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 16:51:41,722 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.5625) internal successors, (137), 15 states have internal predecessors, (137), 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 16:51:41,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:41,750 INFO L225 Difference]: With dead ends: 5423 [2021-11-23 16:51:41,751 INFO L226 Difference]: Without dead ends: 3837 [2021-11-23 16:51:41,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 454 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:51:41,757 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 5824 mSDsluCounter, 7830 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5824 SdHoareTripleChecker+Valid, 9351 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:41,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5824 Valid, 9351 Invalid, 185 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [4 Valid, 100 Invalid, 0 Unknown, 81 Unchecked, 0.2s Time] [2021-11-23 16:51:41,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3837 states. [2021-11-23 16:51:41,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3837 to 3836. [2021-11-23 16:51:42,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3836 states, 3834 states have (on average 1.5646844027125717) internal successors, (5999), 3835 states have internal predecessors, (5999), 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 16:51:42,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3836 states to 3836 states and 5999 transitions. [2021-11-23 16:51:42,031 INFO L78 Accepts]: Start accepts. Automaton has 3836 states and 5999 transitions. Word has length 79 [2021-11-23 16:51:42,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:42,032 INFO L470 AbstractCegarLoop]: Abstraction has 3836 states and 5999 transitions. [2021-11-23 16:51:42,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.5625) internal successors, (137), 15 states have internal predecessors, (137), 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 16:51:42,033 INFO L276 IsEmpty]: Start isEmpty. Operand 3836 states and 5999 transitions. [2021-11-23 16:51:42,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 16:51:42,036 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:42,037 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] [2021-11-23 16:51:42,057 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:42,254 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:42,479 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:42,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:42,653 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:42,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:42,653 INFO L85 PathProgramCache]: Analyzing trace with hash 1937719834, now seen corresponding path program 1 times [2021-11-23 16:51:42,654 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:42,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1373649734] [2021-11-23 16:51:42,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:42,654 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:42,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:42,655 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:42,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 16:51:42,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:42,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:42,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:44,596 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 16:51:44,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:45,285 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 16:51:45,285 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:45,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1373649734] [2021-11-23 16:51:45,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1373649734] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:45,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [496548346] [2021-11-23 16:51:45,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:45,286 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:45,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:51:45,297 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:51:45,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-11-23 16:51:45,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:45,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:45,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:47,008 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 16:51:47,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:47,426 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 16:51:47,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [496548346] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:47,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [418185526] [2021-11-23 16:51:47,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:47,427 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:47,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:51:47,429 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:51:47,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 16:51:47,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:47,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:47,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:49,031 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 16:51:49,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:49,438 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 16:51:49,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [418185526] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:49,438 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:51:49,438 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:51:49,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471387210] [2021-11-23 16:51:49,439 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:51:49,440 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:51:49,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:49,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:51:49,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:51:49,442 INFO L87 Difference]: Start difference. First operand 3836 states and 5999 transitions. Second operand has 16 states, 16 states have (on average 8.9375) internal successors, (143), 15 states have internal predecessors, (143), 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 16:51:49,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:49,945 INFO L93 Difference]: Finished difference Result 5515 states and 8410 transitions. [2021-11-23 16:51:49,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 16:51:49,946 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.9375) internal successors, (143), 15 states have internal predecessors, (143), 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 16:51:49,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:49,960 INFO L225 Difference]: With dead ends: 5515 [2021-11-23 16:51:49,960 INFO L226 Difference]: Without dead ends: 3929 [2021-11-23 16:51:49,964 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 454 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:51:49,965 INFO L933 BasicCegarLoop]: 1521 mSDtfsCounter, 7347 mSDsluCounter, 10642 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7347 SdHoareTripleChecker+Valid, 12163 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 148 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:49,966 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7347 Valid, 12163 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 88 Invalid, 0 Unknown, 148 Unchecked, 0.2s Time] [2021-11-23 16:51:49,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3929 states. [2021-11-23 16:51:50,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3929 to 3846. [2021-11-23 16:51:50,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3846 states, 3844 states have (on average 1.5642559833506764) internal successors, (6013), 3845 states have internal predecessors, (6013), 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 16:51:50,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3846 states to 3846 states and 6013 transitions. [2021-11-23 16:51:50,163 INFO L78 Accepts]: Start accepts. Automaton has 3846 states and 6013 transitions. Word has length 79 [2021-11-23 16:51:50,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:50,164 INFO L470 AbstractCegarLoop]: Abstraction has 3846 states and 6013 transitions. [2021-11-23 16:51:50,164 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.9375) internal successors, (143), 15 states have internal predecessors, (143), 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 16:51:50,165 INFO L276 IsEmpty]: Start isEmpty. Operand 3846 states and 6013 transitions. [2021-11-23 16:51:50,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 16:51:50,168 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:50,168 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] [2021-11-23 16:51:50,185 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:50,411 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:50,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:50,785 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:50,786 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:50,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:50,786 INFO L85 PathProgramCache]: Analyzing trace with hash 343435152, now seen corresponding path program 1 times [2021-11-23 16:51:50,786 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:50,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [860816216] [2021-11-23 16:51:50,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:50,787 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:50,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:50,789 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:50,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 16:51:50,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:50,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:51:50,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:51,137 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 16:51:51,138 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:51,138 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:51,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [860816216] [2021-11-23 16:51:51,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [860816216] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:51,138 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:51,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:51:51,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181971111] [2021-11-23 16:51:51,139 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:51,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:51:51,140 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:51,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:51:51,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:51,141 INFO L87 Difference]: Start difference. First operand 3846 states and 6013 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 16:51:51,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:51,293 INFO L93 Difference]: Finished difference Result 6122 states and 9283 transitions. [2021-11-23 16:51:51,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:51:51,294 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 16:51:51,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:51,305 INFO L225 Difference]: With dead ends: 6122 [2021-11-23 16:51:51,305 INFO L226 Difference]: Without dead ends: 3848 [2021-11-23 16:51:51,312 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 16:51:51,313 INFO L933 BasicCegarLoop]: 1566 mSDtfsCounter, 40 mSDsluCounter, 1524 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 3090 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 16:51:51,314 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 3090 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:51:51,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3848 states. [2021-11-23 16:51:51,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3848 to 3846. [2021-11-23 16:51:51,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3846 states, 3844 states have (on average 1.5543704474505724) internal successors, (5975), 3845 states have internal predecessors, (5975), 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 16:51:51,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3846 states to 3846 states and 5975 transitions. [2021-11-23 16:51:51,524 INFO L78 Accepts]: Start accepts. Automaton has 3846 states and 5975 transitions. Word has length 79 [2021-11-23 16:51:51,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:51,525 INFO L470 AbstractCegarLoop]: Abstraction has 3846 states and 5975 transitions. [2021-11-23 16:51:51,525 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 16:51:51,526 INFO L276 IsEmpty]: Start isEmpty. Operand 3846 states and 5975 transitions. [2021-11-23 16:51:51,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 16:51:51,528 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:51,528 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] [2021-11-23 16:51:51,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:51,745 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:51,745 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:51,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:51,746 INFO L85 PathProgramCache]: Analyzing trace with hash -838493520, now seen corresponding path program 1 times [2021-11-23 16:51:51,746 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:51,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [789257968] [2021-11-23 16:51:51,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:51,747 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:51,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:51,748 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:51,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 16:51:51,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:51,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:51:51,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:52,023 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 16:51:52,023 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:52,023 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:52,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [789257968] [2021-11-23 16:51:52,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [789257968] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:52,024 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:52,024 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:51:52,024 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099637521] [2021-11-23 16:51:52,024 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:52,025 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:51:52,025 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:52,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:51:52,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:51:52,026 INFO L87 Difference]: Start difference. First operand 3846 states and 5975 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 16:51:52,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:52,117 INFO L93 Difference]: Finished difference Result 4666 states and 7145 transitions. [2021-11-23 16:51:52,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:51:52,118 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 16:51:52,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:52,124 INFO L225 Difference]: With dead ends: 4666 [2021-11-23 16:51:52,124 INFO L226 Difference]: Without dead ends: 2392 [2021-11-23 16:51:52,128 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 16:51:52,129 INFO L933 BasicCegarLoop]: 1561 mSDtfsCounter, 34 mSDsluCounter, 1520 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 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 16:51:52,129 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 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 16:51:52,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2392 states. [2021-11-23 16:51:52,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2392 to 2384. [2021-11-23 16:51:52,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2384 states, 2382 states have (on average 1.6335012594458438) internal successors, (3891), 2383 states have internal predecessors, (3891), 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 16:51:52,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2384 states to 2384 states and 3891 transitions. [2021-11-23 16:51:52,218 INFO L78 Accepts]: Start accepts. Automaton has 2384 states and 3891 transitions. Word has length 79 [2021-11-23 16:51:52,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:52,219 INFO L470 AbstractCegarLoop]: Abstraction has 2384 states and 3891 transitions. [2021-11-23 16:51:52,219 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 16:51:52,219 INFO L276 IsEmpty]: Start isEmpty. Operand 2384 states and 3891 transitions. [2021-11-23 16:51:52,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 16:51:52,221 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:52,221 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] [2021-11-23 16:51:52,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:52,437 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:52,438 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:52,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:52,438 INFO L85 PathProgramCache]: Analyzing trace with hash 223555904, now seen corresponding path program 1 times [2021-11-23 16:51:52,439 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:52,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [724323400] [2021-11-23 16:51:52,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:52,439 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:52,439 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:52,441 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:52,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 16:51:52,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:52,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:51:52,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:53,126 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 16:51:53,126 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:53,127 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:53,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [724323400] [2021-11-23 16:51:53,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [724323400] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:53,127 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:53,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:51:53,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000202007] [2021-11-23 16:51:53,128 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:53,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:51:53,129 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:53,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:51:53,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:51:53,130 INFO L87 Difference]: Start difference. First operand 2384 states and 3891 transitions. Second operand has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 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 16:51:53,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:53,260 INFO L93 Difference]: Finished difference Result 3192 states and 5036 transitions. [2021-11-23 16:51:53,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:51:53,261 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 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 16:51:53,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:53,266 INFO L225 Difference]: With dead ends: 3192 [2021-11-23 16:51:53,266 INFO L226 Difference]: Without dead ends: 2384 [2021-11-23 16:51:53,269 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 74 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 16:51:53,270 INFO L933 BasicCegarLoop]: 1529 mSDtfsCounter, 2913 mSDsluCounter, 2967 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2913 SdHoareTripleChecker+Valid, 4496 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 14 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:53,270 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2913 Valid, 4496 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 14 Unchecked, 0.0s Time] [2021-11-23 16:51:53,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2384 states. [2021-11-23 16:51:53,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2384 to 2384. [2021-11-23 16:51:53,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2384 states, 2382 states have (on average 1.6330814441645676) internal successors, (3890), 2383 states have internal predecessors, (3890), 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 16:51:53,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2384 states to 2384 states and 3890 transitions. [2021-11-23 16:51:53,359 INFO L78 Accepts]: Start accepts. Automaton has 2384 states and 3890 transitions. Word has length 79 [2021-11-23 16:51:53,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:53,360 INFO L470 AbstractCegarLoop]: Abstraction has 2384 states and 3890 transitions. [2021-11-23 16:51:53,360 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 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 16:51:53,360 INFO L276 IsEmpty]: Start isEmpty. Operand 2384 states and 3890 transitions. [2021-11-23 16:51:53,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 16:51:53,362 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:53,362 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] [2021-11-23 16:51:53,389 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:53,578 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:53,578 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:53,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:53,579 INFO L85 PathProgramCache]: Analyzing trace with hash 767860800, now seen corresponding path program 1 times [2021-11-23 16:51:53,579 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:53,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1223719249] [2021-11-23 16:51:53,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:53,580 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:53,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:53,581 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:53,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 16:51:53,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:53,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:51:53,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:54,343 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 16:51:54,344 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:51:54,344 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:54,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1223719249] [2021-11-23 16:51:54,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1223719249] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:51:54,344 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:51:54,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:51:54,345 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457167880] [2021-11-23 16:51:54,345 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:51:54,345 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:51:54,345 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:51:54,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:51:54,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:51:54,346 INFO L87 Difference]: Start difference. First operand 2384 states and 3890 transitions. Second operand has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 5 states have internal predecessors, (73), 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 16:51:54,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:51:54,539 INFO L93 Difference]: Finished difference Result 3178 states and 5019 transitions. [2021-11-23 16:51:54,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:51:54,540 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 5 states have internal predecessors, (73), 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 16:51:54,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:51:54,544 INFO L225 Difference]: With dead ends: 3178 [2021-11-23 16:51:54,545 INFO L226 Difference]: Without dead ends: 2366 [2021-11-23 16:51:54,547 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 74 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 16:51:54,548 INFO L933 BasicCegarLoop]: 1532 mSDtfsCounter, 1465 mSDsluCounter, 2996 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1465 SdHoareTripleChecker+Valid, 4528 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:51:54,549 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1465 Valid, 4528 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 52 Invalid, 0 Unknown, 9 Unchecked, 0.1s Time] [2021-11-23 16:51:54,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2366 states. [2021-11-23 16:51:54,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2366 to 2366. [2021-11-23 16:51:54,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2366 states, 2364 states have (on average 1.6362098138747885) internal successors, (3868), 2365 states have internal predecessors, (3868), 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 16:51:54,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2366 states to 2366 states and 3868 transitions. [2021-11-23 16:51:54,639 INFO L78 Accepts]: Start accepts. Automaton has 2366 states and 3868 transitions. Word has length 79 [2021-11-23 16:51:54,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:51:54,640 INFO L470 AbstractCegarLoop]: Abstraction has 2366 states and 3868 transitions. [2021-11-23 16:51:54,640 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 5 states have internal predecessors, (73), 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 16:51:54,640 INFO L276 IsEmpty]: Start isEmpty. Operand 2366 states and 3868 transitions. [2021-11-23 16:51:54,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 16:51:54,642 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:51:54,642 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] [2021-11-23 16:51:54,665 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 16:51:54,858 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:51:54,858 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:51:54,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:51:54,859 INFO L85 PathProgramCache]: Analyzing trace with hash -1077447154, now seen corresponding path program 1 times [2021-11-23 16:51:54,859 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:51:54,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [917138163] [2021-11-23 16:51:54,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:54,860 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:51:54,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:51:54,860 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:51:54,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 16:51:54,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:54,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:54,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:56,754 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 16:51:56,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:57,607 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 16:51:57,608 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:51:57,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [917138163] [2021-11-23 16:51:57,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [917138163] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:57,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1896780831] [2021-11-23 16:51:57,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:57,608 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:51:57,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:51:57,613 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:51:57,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-23 16:51:57,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:57,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:57,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:51:59,358 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 16:51:59,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:51:59,855 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 16:51:59,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1896780831] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:51:59,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526496288] [2021-11-23 16:51:59,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:51:59,856 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:51:59,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:51:59,857 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:51:59,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 16:51:59,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:51:59,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:51:59,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:01,520 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 16:52:01,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:02,024 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 16:52:02,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1526496288] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:02,025 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:02,025 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:52:02,025 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217262374] [2021-11-23 16:52:02,026 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:02,026 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:52:02,027 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:02,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:52:02,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:52:02,028 INFO L87 Difference]: Start difference. First operand 2366 states and 3868 transitions. Second operand has 16 states, 16 states have (on average 9.3125) internal successors, (149), 15 states have internal predecessors, (149), 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 16:52:02,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:02,370 INFO L93 Difference]: Finished difference Result 3174 states and 5021 transitions. [2021-11-23 16:52:02,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 16:52:02,371 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.3125) internal successors, (149), 15 states have internal predecessors, (149), 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 80 [2021-11-23 16:52:02,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:02,381 INFO L225 Difference]: With dead ends: 3174 [2021-11-23 16:52:02,381 INFO L226 Difference]: Without dead ends: 2380 [2021-11-23 16:52:02,384 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 460 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:52:02,385 INFO L933 BasicCegarLoop]: 1518 mSDtfsCounter, 5869 mSDsluCounter, 10631 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5869 SdHoareTripleChecker+Valid, 12149 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:02,385 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5869 Valid, 12149 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 62 Invalid, 0 Unknown, 75 Unchecked, 0.1s Time] [2021-11-23 16:52:02,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2380 states. [2021-11-23 16:52:02,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2380 to 2378. [2021-11-23 16:52:02,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2378 states, 2376 states have (on average 1.6355218855218856) internal successors, (3886), 2377 states have internal predecessors, (3886), 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 16:52:02,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2378 states to 2378 states and 3886 transitions. [2021-11-23 16:52:02,476 INFO L78 Accepts]: Start accepts. Automaton has 2378 states and 3886 transitions. Word has length 80 [2021-11-23 16:52:02,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:02,476 INFO L470 AbstractCegarLoop]: Abstraction has 2378 states and 3886 transitions. [2021-11-23 16:52:02,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.3125) internal successors, (149), 15 states have internal predecessors, (149), 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 16:52:02,477 INFO L276 IsEmpty]: Start isEmpty. Operand 2378 states and 3886 transitions. [2021-11-23 16:52:02,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 16:52:02,479 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:02,479 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] [2021-11-23 16:52:02,529 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:02,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:02,916 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:03,105 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:03,105 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:03,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:03,106 INFO L85 PathProgramCache]: Analyzing trace with hash -481488574, now seen corresponding path program 1 times [2021-11-23 16:52:03,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:03,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1977573799] [2021-11-23 16:52:03,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:03,107 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:03,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:03,108 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:03,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 16:52:03,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:03,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:52:03,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:03,387 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 16:52:03,387 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:03,387 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:03,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1977573799] [2021-11-23 16:52:03,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1977573799] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:03,387 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:03,388 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:52:03,388 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265375685] [2021-11-23 16:52:03,388 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:03,388 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:52:03,388 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:03,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:52:03,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:52:03,389 INFO L87 Difference]: Start difference. First operand 2378 states and 3886 transitions. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 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 16:52:03,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:03,440 INFO L93 Difference]: Finished difference Result 2778 states and 4452 transitions. [2021-11-23 16:52:03,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:52:03,441 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 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 80 [2021-11-23 16:52:03,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:03,444 INFO L225 Difference]: With dead ends: 2778 [2021-11-23 16:52:03,445 INFO L226 Difference]: Without dead ends: 1984 [2021-11-23 16:52:03,447 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 78 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 16:52:03,448 INFO L933 BasicCegarLoop]: 1556 mSDtfsCounter, 31 mSDsluCounter, 1508 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 3064 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 16:52:03,448 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 3064 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:52:03,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1984 states. [2021-11-23 16:52:03,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1984 to 1982. [2021-11-23 16:52:03,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1982 states, 1980 states have (on average 1.6737373737373737) internal successors, (3314), 1981 states have internal predecessors, (3314), 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 16:52:03,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1982 states to 1982 states and 3314 transitions. [2021-11-23 16:52:03,516 INFO L78 Accepts]: Start accepts. Automaton has 1982 states and 3314 transitions. Word has length 80 [2021-11-23 16:52:03,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:03,516 INFO L470 AbstractCegarLoop]: Abstraction has 1982 states and 3314 transitions. [2021-11-23 16:52:03,517 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 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 16:52:03,517 INFO L276 IsEmpty]: Start isEmpty. Operand 1982 states and 3314 transitions. [2021-11-23 16:52:03,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 16:52:03,518 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:03,519 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 16:52:03,532 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:03,724 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:03,724 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:03,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:03,725 INFO L85 PathProgramCache]: Analyzing trace with hash -362198703, now seen corresponding path program 1 times [2021-11-23 16:52:03,725 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:03,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [140921858] [2021-11-23 16:52:03,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:03,725 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:03,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:03,726 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:03,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 16:52:03,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:03,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:52:03,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:05,558 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 16:52:05,558 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:06,481 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 16:52:06,482 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:06,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [140921858] [2021-11-23 16:52:06,482 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [140921858] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:06,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [773572060] [2021-11-23 16:52:06,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:06,482 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:06,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:06,485 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:06,509 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-23 16:52:06,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:06,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:52:06,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:08,248 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 16:52:08,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:08,845 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 16:52:08,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [773572060] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:08,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [721432823] [2021-11-23 16:52:08,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:08,846 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:08,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:08,849 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:08,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-23 16:52:08,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:08,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:52:08,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:10,507 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 16:52:10,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:11,132 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 16:52:11,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [721432823] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:11,133 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:11,133 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:52:11,134 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673932904] [2021-11-23 16:52:11,134 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:11,135 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:52:11,135 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:11,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:52:11,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:52:11,136 INFO L87 Difference]: Start difference. First operand 1982 states and 3314 transitions. Second operand has 16 states, 16 states have (on average 9.6875) internal successors, (155), 15 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 16:52:11,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:11,461 INFO L93 Difference]: Finished difference Result 2394 states and 3897 transitions. [2021-11-23 16:52:11,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 16:52:11,462 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.6875) internal successors, (155), 15 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 81 [2021-11-23 16:52:11,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:11,464 INFO L225 Difference]: With dead ends: 2394 [2021-11-23 16:52:11,465 INFO L226 Difference]: Without dead ends: 1996 [2021-11-23 16:52:11,466 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 466 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:52:11,467 INFO L933 BasicCegarLoop]: 1516 mSDtfsCounter, 5837 mSDsluCounter, 7867 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5837 SdHoareTripleChecker+Valid, 9383 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:11,467 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5837 Valid, 9383 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 65 Invalid, 0 Unknown, 81 Unchecked, 0.1s Time] [2021-11-23 16:52:11,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1996 states. [2021-11-23 16:52:11,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1996 to 1994. [2021-11-23 16:52:11,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1994 states, 1992 states have (on average 1.6726907630522088) internal successors, (3332), 1993 states have internal predecessors, (3332), 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 16:52:11,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1994 states to 1994 states and 3332 transitions. [2021-11-23 16:52:11,536 INFO L78 Accepts]: Start accepts. Automaton has 1994 states and 3332 transitions. Word has length 81 [2021-11-23 16:52:11,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:11,536 INFO L470 AbstractCegarLoop]: Abstraction has 1994 states and 3332 transitions. [2021-11-23 16:52:11,536 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.6875) internal successors, (155), 15 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 16:52:11,537 INFO L276 IsEmpty]: Start isEmpty. Operand 1994 states and 3332 transitions. [2021-11-23 16:52:11,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 16:52:11,538 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:11,539 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] [2021-11-23 16:52:11,543 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Ended with exit code 0 [2021-11-23 16:52:11,771 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:11,951 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:12,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:12,142 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:12,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:12,142 INFO L85 PathProgramCache]: Analyzing trace with hash 46440069, now seen corresponding path program 1 times [2021-11-23 16:52:12,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:12,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [786381340] [2021-11-23 16:52:12,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:12,143 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:12,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:12,144 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:12,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 16:52:12,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:12,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:52:12,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:12,416 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 16:52:12,416 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:12,417 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:12,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [786381340] [2021-11-23 16:52:12,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [786381340] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:12,417 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:12,417 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:52:12,418 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903130537] [2021-11-23 16:52:12,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:12,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:52:12,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:12,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:52:12,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:52:12,419 INFO L87 Difference]: Start difference. First operand 1994 states and 3332 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 16:52:12,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:12,479 INFO L93 Difference]: Finished difference Result 2196 states and 3613 transitions. [2021-11-23 16:52:12,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:52:12,482 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 16:52:12,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:12,484 INFO L225 Difference]: With dead ends: 2196 [2021-11-23 16:52:12,484 INFO L226 Difference]: Without dead ends: 1798 [2021-11-23 16:52:12,485 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 79 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 16:52:12,486 INFO L933 BasicCegarLoop]: 1548 mSDtfsCounter, 26 mSDsluCounter, 1500 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 3048 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 16:52:12,486 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 3048 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:52:12,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1798 states. [2021-11-23 16:52:12,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1798 to 1796. [2021-11-23 16:52:12,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1796 states, 1794 states have (on average 1.6989966555183946) internal successors, (3048), 1795 states have internal predecessors, (3048), 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 16:52:12,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1796 states to 1796 states and 3048 transitions. [2021-11-23 16:52:12,540 INFO L78 Accepts]: Start accepts. Automaton has 1796 states and 3048 transitions. Word has length 81 [2021-11-23 16:52:12,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:12,541 INFO L470 AbstractCegarLoop]: Abstraction has 1796 states and 3048 transitions. [2021-11-23 16:52:12,541 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 16:52:12,541 INFO L276 IsEmpty]: Start isEmpty. Operand 1796 states and 3048 transitions. [2021-11-23 16:52:12,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 16:52:12,544 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:12,544 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 16:52:12,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:12,761 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:12,761 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:12,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:12,762 INFO L85 PathProgramCache]: Analyzing trace with hash -126068059, now seen corresponding path program 1 times [2021-11-23 16:52:12,762 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:12,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1730690400] [2021-11-23 16:52:12,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:12,762 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:12,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:12,763 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:12,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 16:52:12,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:12,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:52:12,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:13,887 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 16:52:13,887 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:13,887 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:13,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1730690400] [2021-11-23 16:52:13,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1730690400] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:13,887 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:13,888 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 16:52:13,888 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993863088] [2021-11-23 16:52:13,888 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:13,888 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:52:13,888 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:13,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:52:13,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:52:13,889 INFO L87 Difference]: Start difference. First operand 1796 states and 3048 transitions. Second operand has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 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 16:52:14,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:14,063 INFO L93 Difference]: Finished difference Result 2150 states and 3533 transitions. [2021-11-23 16:52:14,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:52:14,064 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 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 82 [2021-11-23 16:52:14,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:14,068 INFO L225 Difference]: With dead ends: 2150 [2021-11-23 16:52:14,068 INFO L226 Difference]: Without dead ends: 1950 [2021-11-23 16:52:14,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 77 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 16:52:14,070 INFO L933 BasicCegarLoop]: 1602 mSDtfsCounter, 3179 mSDsluCounter, 1713 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3179 SdHoareTripleChecker+Valid, 3315 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:14,071 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3179 Valid, 3315 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:52:14,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1950 states. [2021-11-23 16:52:14,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1950 to 1796. [2021-11-23 16:52:14,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1796 states, 1794 states have (on average 1.6956521739130435) internal successors, (3042), 1795 states have internal predecessors, (3042), 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 16:52:14,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1796 states to 1796 states and 3042 transitions. [2021-11-23 16:52:14,127 INFO L78 Accepts]: Start accepts. Automaton has 1796 states and 3042 transitions. Word has length 82 [2021-11-23 16:52:14,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:14,128 INFO L470 AbstractCegarLoop]: Abstraction has 1796 states and 3042 transitions. [2021-11-23 16:52:14,128 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 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 16:52:14,128 INFO L276 IsEmpty]: Start isEmpty. Operand 1796 states and 3042 transitions. [2021-11-23 16:52:14,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 16:52:14,130 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:14,130 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 16:52:14,149 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:14,345 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:14,346 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:14,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:14,346 INFO L85 PathProgramCache]: Analyzing trace with hash 1376291048, now seen corresponding path program 1 times [2021-11-23 16:52:14,347 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:14,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1315071159] [2021-11-23 16:52:14,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:14,347 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:14,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:14,348 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:14,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-23 16:52:14,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:14,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:52:14,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:15,393 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 16:52:15,393 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:15,394 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:15,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1315071159] [2021-11-23 16:52:15,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1315071159] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:15,394 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:15,394 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 16:52:15,394 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140434392] [2021-11-23 16:52:15,394 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:15,395 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:52:15,395 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:15,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:52:15,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:52:15,396 INFO L87 Difference]: Start difference. First operand 1796 states and 3042 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 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 16:52:15,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:15,611 INFO L93 Difference]: Finished difference Result 2084 states and 3439 transitions. [2021-11-23 16:52:15,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:52:15,612 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 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 16:52:15,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:15,615 INFO L225 Difference]: With dead ends: 2084 [2021-11-23 16:52:15,615 INFO L226 Difference]: Without dead ends: 2016 [2021-11-23 16:52:15,615 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 77 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 16:52:15,616 INFO L933 BasicCegarLoop]: 1610 mSDtfsCounter, 3230 mSDsluCounter, 1787 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3230 SdHoareTripleChecker+Valid, 3397 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:15,617 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3230 Valid, 3397 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 16:52:15,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2016 states. [2021-11-23 16:52:15,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2016 to 1866. [2021-11-23 16:52:15,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1866 states, 1864 states have (on average 1.6813304721030042) internal successors, (3134), 1865 states have internal predecessors, (3134), 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 16:52:15,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1866 states to 1866 states and 3134 transitions. [2021-11-23 16:52:15,678 INFO L78 Accepts]: Start accepts. Automaton has 1866 states and 3134 transitions. Word has length 82 [2021-11-23 16:52:15,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:15,679 INFO L470 AbstractCegarLoop]: Abstraction has 1866 states and 3134 transitions. [2021-11-23 16:52:15,679 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 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 16:52:15,679 INFO L276 IsEmpty]: Start isEmpty. Operand 1866 states and 3134 transitions. [2021-11-23 16:52:15,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 16:52:15,681 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:15,681 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 16:52:15,697 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Ended with exit code 0 [2021-11-23 16:52:15,896 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:15,897 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:15,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:15,897 INFO L85 PathProgramCache]: Analyzing trace with hash 20827269, now seen corresponding path program 1 times [2021-11-23 16:52:15,898 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:15,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [106129355] [2021-11-23 16:52:15,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:15,898 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:15,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:15,900 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:15,904 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 16:52:15,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:15,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:52:15,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:16,965 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 16:52:16,965 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:16,965 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:16,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [106129355] [2021-11-23 16:52:16,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [106129355] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:16,966 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:16,966 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 16:52:16,966 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877215793] [2021-11-23 16:52:16,966 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:16,966 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:52:16,967 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:16,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:52:16,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:52:16,968 INFO L87 Difference]: Start difference. First operand 1866 states and 3134 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 16:52:17,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:17,168 INFO L93 Difference]: Finished difference Result 2154 states and 3531 transitions. [2021-11-23 16:52:17,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:52:17,168 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 82 [2021-11-23 16:52:17,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:17,175 INFO L225 Difference]: With dead ends: 2154 [2021-11-23 16:52:17,176 INFO L226 Difference]: Without dead ends: 2086 [2021-11-23 16:52:17,177 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 77 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 16:52:17,178 INFO L933 BasicCegarLoop]: 1617 mSDtfsCounter, 4691 mSDsluCounter, 1705 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4691 SdHoareTripleChecker+Valid, 3322 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:17,179 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4691 Valid, 3322 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:52:17,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2086 states. [2021-11-23 16:52:17,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2086 to 1942. [2021-11-23 16:52:17,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1942 states, 1940 states have (on average 1.6670103092783506) internal successors, (3234), 1941 states have internal predecessors, (3234), 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 16:52:17,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1942 states to 1942 states and 3234 transitions. [2021-11-23 16:52:17,225 INFO L78 Accepts]: Start accepts. Automaton has 1942 states and 3234 transitions. Word has length 82 [2021-11-23 16:52:17,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:17,225 INFO L470 AbstractCegarLoop]: Abstraction has 1942 states and 3234 transitions. [2021-11-23 16:52:17,226 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 16:52:17,226 INFO L276 IsEmpty]: Start isEmpty. Operand 1942 states and 3234 transitions. [2021-11-23 16:52:17,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 16:52:17,227 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:17,227 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 16:52:17,243 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:17,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:17,441 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:17,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:17,441 INFO L85 PathProgramCache]: Analyzing trace with hash -339524856, now seen corresponding path program 1 times [2021-11-23 16:52:17,442 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:17,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1819658473] [2021-11-23 16:52:17,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:17,442 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:17,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:17,443 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:17,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 16:52:17,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:17,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:52:17,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:18,527 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 16:52:18,527 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:18,527 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:18,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1819658473] [2021-11-23 16:52:18,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1819658473] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:18,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:18,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 16:52:18,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440381042] [2021-11-23 16:52:18,528 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:18,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:52:18,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:18,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:52:18,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:52:18,530 INFO L87 Difference]: Start difference. First operand 1942 states and 3234 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 16:52:18,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:18,699 INFO L93 Difference]: Finished difference Result 2230 states and 3631 transitions. [2021-11-23 16:52:18,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:52:18,700 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 82 [2021-11-23 16:52:18,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:18,702 INFO L225 Difference]: With dead ends: 2230 [2021-11-23 16:52:18,703 INFO L226 Difference]: Without dead ends: 2162 [2021-11-23 16:52:18,703 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 77 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 16:52:18,704 INFO L933 BasicCegarLoop]: 1606 mSDtfsCounter, 3171 mSDsluCounter, 1718 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3171 SdHoareTripleChecker+Valid, 3324 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:18,704 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3171 Valid, 3324 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:52:18,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2162 states. [2021-11-23 16:52:18,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2162 to 2018. [2021-11-23 16:52:18,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2018 states, 2016 states have (on average 1.6537698412698412) internal successors, (3334), 2017 states have internal predecessors, (3334), 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 16:52:18,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2018 states to 2018 states and 3334 transitions. [2021-11-23 16:52:18,812 INFO L78 Accepts]: Start accepts. Automaton has 2018 states and 3334 transitions. Word has length 82 [2021-11-23 16:52:18,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:18,813 INFO L470 AbstractCegarLoop]: Abstraction has 2018 states and 3334 transitions. [2021-11-23 16:52:18,813 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 16:52:18,813 INFO L276 IsEmpty]: Start isEmpty. Operand 2018 states and 3334 transitions. [2021-11-23 16:52:18,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 16:52:18,815 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:18,815 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 16:52:18,834 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:19,030 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:19,030 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:19,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:19,031 INFO L85 PathProgramCache]: Analyzing trace with hash -1782997605, now seen corresponding path program 1 times [2021-11-23 16:52:19,031 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:19,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2098314438] [2021-11-23 16:52:19,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:19,031 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:19,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:19,032 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:19,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 16:52:19,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:19,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 16:52:19,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:26,579 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 16:52:26,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:30,837 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 16:52:30,837 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:30,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2098314438] [2021-11-23 16:52:30,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2098314438] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:30,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1697431873] [2021-11-23 16:52:30,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:30,838 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:30,838 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:30,838 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:30,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-23 16:52:30,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:31,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 16:52:31,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:35,861 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 16:52:35,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:37,344 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 16:52:37,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1697431873] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:37,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1710985813] [2021-11-23 16:52:37,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:37,345 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:37,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:37,346 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:37,347 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-23 16:52:37,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:37,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:52:37,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:40,417 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 16:52:40,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:41,720 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 16:52:41,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1710985813] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:41,721 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:41,721 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 24, 28, 24, 10, 9] total 65 [2021-11-23 16:52:41,721 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065551641] [2021-11-23 16:52:41,721 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:41,722 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-23 16:52:41,722 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:41,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-23 16:52:41,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=531, Invalid=3629, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 16:52:41,726 INFO L87 Difference]: Start difference. First operand 2018 states and 3334 transitions. Second operand has 65 states, 65 states have (on average 4.292307692307692) internal successors, (279), 65 states have internal predecessors, (279), 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 16:52:43,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:43,953 INFO L93 Difference]: Finished difference Result 2337 states and 3743 transitions. [2021-11-23 16:52:43,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-23 16:52:43,954 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 4.292307692307692) internal successors, (279), 65 states have internal predecessors, (279), 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 16:52:43,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:43,958 INFO L225 Difference]: With dead ends: 2337 [2021-11-23 16:52:43,958 INFO L226 Difference]: Without dead ends: 2199 [2021-11-23 16:52:43,961 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 428 SyntacticMatches, 2 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1835 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=628, Invalid=3928, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 16:52:43,962 INFO L933 BasicCegarLoop]: 1535 mSDtfsCounter, 17546 mSDsluCounter, 27790 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17546 SdHoareTripleChecker+Valid, 29325 SdHoareTripleChecker+Invalid, 671 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 180 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:43,963 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17546 Valid, 29325 Invalid, 671 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [26 Valid, 465 Invalid, 0 Unknown, 180 Unchecked, 0.9s Time] [2021-11-23 16:52:43,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2199 states. [2021-11-23 16:52:44,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2199 to 2029. [2021-11-23 16:52:44,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2029 states, 2027 states have (on average 1.651208682782437) internal successors, (3347), 2028 states have internal predecessors, (3347), 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 16:52:44,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2029 states to 2029 states and 3347 transitions. [2021-11-23 16:52:44,041 INFO L78 Accepts]: Start accepts. Automaton has 2029 states and 3347 transitions. Word has length 83 [2021-11-23 16:52:44,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:44,042 INFO L470 AbstractCegarLoop]: Abstraction has 2029 states and 3347 transitions. [2021-11-23 16:52:44,042 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 4.292307692307692) internal successors, (279), 65 states have internal predecessors, (279), 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 16:52:44,042 INFO L276 IsEmpty]: Start isEmpty. Operand 2029 states and 3347 transitions. [2021-11-23 16:52:44,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 16:52:44,044 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:44,044 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 16:52:44,093 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:44,279 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Ended with exit code 0 [2021-11-23 16:52:44,470 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Ended with exit code 0 [2021-11-23 16:52:44,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:44,669 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:44,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:44,670 INFO L85 PathProgramCache]: Analyzing trace with hash -852701794, now seen corresponding path program 1 times [2021-11-23 16:52:44,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:44,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [62727232] [2021-11-23 16:52:44,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:44,671 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:44,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:44,672 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:44,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-23 16:52:44,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:44,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:52:44,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:46,683 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 16:52:46,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:47,252 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 16:52:47,252 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:47,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [62727232] [2021-11-23 16:52:47,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [62727232] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:47,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1877925738] [2021-11-23 16:52:47,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:47,253 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:47,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:47,254 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:47,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-23 16:52:47,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:47,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 16:52:47,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:58,493 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 16:52:58,494 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:05,326 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 16:53:05,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1877925738] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:05,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918087022] [2021-11-23 16:53:05,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:05,327 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:05,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:53:05,328 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:53:05,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-23 16:53:05,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:05,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 16:53:05,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:16,840 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 16:53:16,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:18,297 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 16:53:18,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918087022] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:18,297 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:53:18,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 29, 24, 28, 24] total 83 [2021-11-23 16:53:18,298 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092805840] [2021-11-23 16:53:18,298 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:53:18,299 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-23 16:53:18,299 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:18,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-23 16:53:18,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=681, Invalid=6125, Unknown=0, NotChecked=0, Total=6806 [2021-11-23 16:53:18,302 INFO L87 Difference]: Start difference. First operand 2029 states and 3347 transitions. Second operand has 83 states, 83 states have (on average 4.0602409638554215) internal successors, (337), 83 states have internal predecessors, (337), 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 16:53:25,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:25,140 INFO L93 Difference]: Finished difference Result 2378 states and 3786 transitions. [2021-11-23 16:53:25,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 16:53:25,140 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 4.0602409638554215) internal successors, (337), 83 states have internal predecessors, (337), 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 16:53:25,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:25,143 INFO L225 Difference]: With dead ends: 2378 [2021-11-23 16:53:25,143 INFO L226 Difference]: Without dead ends: 2230 [2021-11-23 16:53:25,147 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 518 GetRequests, 419 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2987 ImplicationChecksByTransitivity, 23.7s TimeCoverageRelationStatistics Valid=1026, Invalid=8874, Unknown=0, NotChecked=0, Total=9900 [2021-11-23 16:53:25,147 INFO L933 BasicCegarLoop]: 1538 mSDtfsCounter, 20355 mSDsluCounter, 30897 mSDsCounter, 0 mSdLazyCounter, 523 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20355 SdHoareTripleChecker+Valid, 32435 SdHoareTripleChecker+Invalid, 758 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 212 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:25,148 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20355 Valid, 32435 Invalid, 758 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [23 Valid, 523 Invalid, 0 Unknown, 212 Unchecked, 1.1s Time] [2021-11-23 16:53:25,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2230 states. [2021-11-23 16:53:25,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2230 to 2030. [2021-11-23 16:53:25,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2030 states, 2028 states have (on average 1.650887573964497) internal successors, (3348), 2029 states have internal predecessors, (3348), 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 16:53:25,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2030 states to 2030 states and 3348 transitions. [2021-11-23 16:53:25,229 INFO L78 Accepts]: Start accepts. Automaton has 2030 states and 3348 transitions. Word has length 83 [2021-11-23 16:53:25,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:25,230 INFO L470 AbstractCegarLoop]: Abstraction has 2030 states and 3348 transitions. [2021-11-23 16:53:25,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 4.0602409638554215) internal successors, (337), 83 states have internal predecessors, (337), 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 16:53:25,230 INFO L276 IsEmpty]: Start isEmpty. Operand 2030 states and 3348 transitions. [2021-11-23 16:53:25,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 16:53:25,232 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:25,232 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 16:53:25,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:25,448 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (40)] Ended with exit code 0 [2021-11-23 16:53:25,673 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2021-11-23 16:53:25,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:25,848 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:25,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:25,848 INFO L85 PathProgramCache]: Analyzing trace with hash 861284219, now seen corresponding path program 1 times [2021-11-23 16:53:25,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:25,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1637025613] [2021-11-23 16:53:25,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:25,849 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:25,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:25,851 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:25,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-23 16:53:25,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:25,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 16:53:25,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:28,764 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 16:53:28,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:29,798 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 16:53:29,798 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:29,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1637025613] [2021-11-23 16:53:29,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1637025613] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:29,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1687662761] [2021-11-23 16:53:29,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:29,799 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:29,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:53:29,800 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:53:29,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-11-23 16:53:29,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:29,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 16:53:29,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:33,021 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 16:53:33,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:33,736 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 16:53:33,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1687662761] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:33,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409827955] [2021-11-23 16:53:33,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:33,736 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:33,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:53:33,737 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:53:33,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-23 16:53:33,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:33,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 16:53:33,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:42,663 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 16:53:42,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:48,837 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 16:53:48,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409827955] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:48,837 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:53:48,838 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 16, 9, 24, 24] total 89 [2021-11-23 16:53:48,838 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505095716] [2021-11-23 16:53:48,838 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:53:48,839 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2021-11-23 16:53:48,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:48,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-11-23 16:53:48,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=628, Invalid=7204, Unknown=0, NotChecked=0, Total=7832 [2021-11-23 16:53:48,842 INFO L87 Difference]: Start difference. First operand 2030 states and 3348 transitions. Second operand has 89 states, 89 states have (on average 4.48314606741573) internal successors, (399), 89 states have internal predecessors, (399), 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 16:53:55,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:55,447 INFO L93 Difference]: Finished difference Result 2377 states and 3782 transitions. [2021-11-23 16:53:55,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 16:53:55,449 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 4.48314606741573) internal successors, (399), 89 states have internal predecessors, (399), 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 16:53:55,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:55,451 INFO L225 Difference]: With dead ends: 2377 [2021-11-23 16:53:55,451 INFO L226 Difference]: Without dead ends: 2217 [2021-11-23 16:53:55,455 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 408 SyntacticMatches, 6 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 5175 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=1231, Invalid=10979, Unknown=0, NotChecked=0, Total=12210 [2021-11-23 16:53:55,456 INFO L933 BasicCegarLoop]: 1541 mSDtfsCounter, 29082 mSDsluCounter, 44125 mSDsCounter, 0 mSdLazyCounter, 650 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29082 SdHoareTripleChecker+Valid, 45666 SdHoareTripleChecker+Invalid, 1052 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 650 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 372 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:55,457 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29082 Valid, 45666 Invalid, 1052 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [30 Valid, 650 Invalid, 0 Unknown, 372 Unchecked, 1.3s Time] [2021-11-23 16:53:55,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2217 states. [2021-11-23 16:53:55,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2217 to 2008. [2021-11-23 16:53:55,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2008 states, 2006 states have (on average 1.6545363908275175) internal successors, (3319), 2007 states have internal predecessors, (3319), 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 16:53:55,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2008 states to 2008 states and 3319 transitions. [2021-11-23 16:53:55,512 INFO L78 Accepts]: Start accepts. Automaton has 2008 states and 3319 transitions. Word has length 83 [2021-11-23 16:53:55,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:55,513 INFO L470 AbstractCegarLoop]: Abstraction has 2008 states and 3319 transitions. [2021-11-23 16:53:55,513 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 4.48314606741573) internal successors, (399), 89 states have internal predecessors, (399), 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 16:53:55,513 INFO L276 IsEmpty]: Start isEmpty. Operand 2008 states and 3319 transitions. [2021-11-23 16:53:55,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 16:53:55,515 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:55,515 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] [2021-11-23 16:53:55,540 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Ended with exit code 0 [2021-11-23 16:53:55,755 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:55,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:56,129 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:56,129 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:56,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:56,130 INFO L85 PathProgramCache]: Analyzing trace with hash 2053442141, now seen corresponding path program 1 times [2021-11-23 16:53:56,131 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:56,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [980298978] [2021-11-23 16:53:56,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:53:56,131 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:56,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:56,132 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:56,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-23 16:53:56,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:56,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 16:53:56,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:09,453 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 16:54:09,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:18,730 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 16:54:18,730 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:18,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [980298978] [2021-11-23 16:54:18,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [980298978] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:18,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [746667082] [2021-11-23 16:54:18,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:18,731 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:54:18,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:54:18,732 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:54:18,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-23 16:54:18,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:18,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 16:54:18,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:34,595 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 16:54:34,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:38,147 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 16:54:38,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [746667082] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:38,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1785665467] [2021-11-23 16:54:38,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:38,148 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:54:38,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:54:38,149 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:54:38,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-23 16:54:38,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:38,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 16:54:38,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:43,266 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 16:54:43,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:44,763 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 16:54:44,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1785665467] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:44,763 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:54:44,764 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 22, 29, 24, 29, 24] total 68 [2021-11-23 16:54:44,764 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810584251] [2021-11-23 16:54:44,764 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:54:44,765 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-23 16:54:44,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:44,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-23 16:54:44,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=521, Invalid=4035, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 16:54:44,767 INFO L87 Difference]: Start difference. First operand 2008 states and 3319 transitions. Second operand has 68 states, 68 states have (on average 3.1176470588235294) internal successors, (212), 68 states have internal predecessors, (212), 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 16:54:46,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:46,822 INFO L93 Difference]: Finished difference Result 2166 states and 3528 transitions. [2021-11-23 16:54:46,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 16:54:46,823 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.1176470588235294) internal successors, (212), 68 states have internal predecessors, (212), 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 16:54:46,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:46,825 INFO L225 Difference]: With dead ends: 2166 [2021-11-23 16:54:46,825 INFO L226 Difference]: Without dead ends: 2032 [2021-11-23 16:54:46,828 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 432 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1724 ImplicationChecksByTransitivity, 30.2s TimeCoverageRelationStatistics Valid=576, Invalid=4254, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 16:54:46,828 INFO L933 BasicCegarLoop]: 1505 mSDtfsCounter, 13176 mSDsluCounter, 33022 mSDsCounter, 0 mSdLazyCounter, 366 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13176 SdHoareTripleChecker+Valid, 34527 SdHoareTripleChecker+Invalid, 611 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 366 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 229 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:46,829 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13176 Valid, 34527 Invalid, 611 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [16 Valid, 366 Invalid, 0 Unknown, 229 Unchecked, 0.8s Time] [2021-11-23 16:54:46,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2032 states. [2021-11-23 16:54:46,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2032 to 2014. [2021-11-23 16:54:46,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2014 states, 2012 states have (on average 1.6530815109343937) internal successors, (3326), 2013 states have internal predecessors, (3326), 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 16:54:46,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2014 states to 2014 states and 3326 transitions. [2021-11-23 16:54:46,882 INFO L78 Accepts]: Start accepts. Automaton has 2014 states and 3326 transitions. Word has length 84 [2021-11-23 16:54:46,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:46,882 INFO L470 AbstractCegarLoop]: Abstraction has 2014 states and 3326 transitions. [2021-11-23 16:54:46,882 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 3.1176470588235294) internal successors, (212), 68 states have internal predecessors, (212), 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 16:54:46,882 INFO L276 IsEmpty]: Start isEmpty. Operand 2014 states and 3326 transitions. [2021-11-23 16:54:46,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 16:54:46,883 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:46,883 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] [2021-11-23 16:54:46,888 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:47,110 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2021-11-23 16:54:47,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:47,485 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:47,485 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:47,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:47,485 INFO L85 PathProgramCache]: Analyzing trace with hash -681934796, now seen corresponding path program 1 times [2021-11-23 16:54:47,486 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:47,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1589397074] [2021-11-23 16:54:47,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:47,486 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:47,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:47,487 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:47,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 16:54:47,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:47,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:54:47,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:48,109 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 16:54:48,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:48,436 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 16:54:48,436 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:48,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1589397074] [2021-11-23 16:54:48,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1589397074] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:48,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [148846281] [2021-11-23 16:54:48,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:48,437 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:54:48,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:54:48,437 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:54:48,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-11-23 16:54:48,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:48,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:54:48,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:49,047 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 16:54:49,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:49,345 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 16:54:49,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [148846281] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:49,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [902653069] [2021-11-23 16:54:49,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:49,346 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:54:49,346 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:54:49,352 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:54:49,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 16:54:49,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:49,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:54:49,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:49,866 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 16:54:49,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:50,169 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 16:54:50,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [902653069] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:50,170 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:54:50,170 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 6 [2021-11-23 16:54:50,170 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604103853] [2021-11-23 16:54:50,170 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:54:50,171 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:54:50,171 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:50,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:54:50,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:54:50,172 INFO L87 Difference]: Start difference. First operand 2014 states and 3326 transitions. Second operand has 6 states, 6 states have (on average 26.833333333333332) internal successors, (161), 6 states have internal predecessors, (161), 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 16:54:50,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:50,324 INFO L93 Difference]: Finished difference Result 3068 states and 4710 transitions. [2021-11-23 16:54:50,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:54:50,325 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 26.833333333333332) internal successors, (161), 6 states have internal predecessors, (161), 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 16:54:50,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:50,328 INFO L225 Difference]: With dead ends: 3068 [2021-11-23 16:54:50,328 INFO L226 Difference]: Without dead ends: 2670 [2021-11-23 16:54:50,329 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 491 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:54:50,330 INFO L933 BasicCegarLoop]: 1559 mSDtfsCounter, 3061 mSDsluCounter, 1743 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3061 SdHoareTripleChecker+Valid, 3302 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 17 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:50,331 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3061 Valid, 3302 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 22 Invalid, 0 Unknown, 17 Unchecked, 0.0s Time] [2021-11-23 16:54:50,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2670 states. [2021-11-23 16:54:50,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2670 to 2590. [2021-11-23 16:54:50,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2590 states, 2588 states have (on average 1.5726429675425038) internal successors, (4070), 2589 states have internal predecessors, (4070), 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 16:54:50,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2590 states to 2590 states and 4070 transitions. [2021-11-23 16:54:50,415 INFO L78 Accepts]: Start accepts. Automaton has 2590 states and 4070 transitions. Word has length 84 [2021-11-23 16:54:50,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:50,416 INFO L470 AbstractCegarLoop]: Abstraction has 2590 states and 4070 transitions. [2021-11-23 16:54:50,416 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 26.833333333333332) internal successors, (161), 6 states have internal predecessors, (161), 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 16:54:50,416 INFO L276 IsEmpty]: Start isEmpty. Operand 2590 states and 4070 transitions. [2021-11-23 16:54:50,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 16:54:50,417 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:50,418 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 16:54:50,433 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:50,629 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Ended with exit code 0 [2021-11-23 16:54:50,845 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:51,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:54:51,020 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:51,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:51,021 INFO L85 PathProgramCache]: Analyzing trace with hash 643511936, now seen corresponding path program 1 times [2021-11-23 16:54:51,021 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:51,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1743054099] [2021-11-23 16:54:51,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:51,021 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:51,022 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:51,022 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:51,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 16:54:51,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:51,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 16:54:51,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:54,803 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 16:54:54,803 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:56,339 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 16:54:56,340 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:56,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1743054099] [2021-11-23 16:54:56,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1743054099] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:56,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [313102951] [2021-11-23 16:54:56,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:54:56,340 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:54:56,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:54:56,341 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:54:56,342 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2021-11-23 16:54:56,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:54:56,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 16:54:56,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:00,148 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 16:55:00,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:01,286 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 16:55:01,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [313102951] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:01,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1908480570] [2021-11-23 16:55:01,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:01,287 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:01,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:55:01,288 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:55:01,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-23 16:55:01,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:01,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 16:55:01,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:09,865 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 16:55:09,865 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:13,531 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 16:55:13,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1908480570] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:13,531 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:55:13,532 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15, 15, 24, 22] total 79 [2021-11-23 16:55:13,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730524561] [2021-11-23 16:55:13,532 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:55:13,533 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-23 16:55:13,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:13,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-23 16:55:13,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=850, Invalid=5312, Unknown=0, NotChecked=0, Total=6162 [2021-11-23 16:55:13,536 INFO L87 Difference]: Start difference. First operand 2590 states and 4070 transitions. Second operand has 79 states, 79 states have (on average 4.1645569620253164) internal successors, (329), 79 states have internal predecessors, (329), 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 16:55:15,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:15,105 INFO L93 Difference]: Finished difference Result 3350 states and 5035 transitions. [2021-11-23 16:55:15,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 16:55:15,106 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 4.1645569620253164) internal successors, (329), 79 states have internal predecessors, (329), 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 16:55:15,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:15,109 INFO L225 Difference]: With dead ends: 3350 [2021-11-23 16:55:15,110 INFO L226 Difference]: Without dead ends: 2976 [2021-11-23 16:55:15,112 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 422 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2871 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=934, Invalid=5708, Unknown=0, NotChecked=0, Total=6642 [2021-11-23 16:55:15,112 INFO L933 BasicCegarLoop]: 1544 mSDtfsCounter, 13193 mSDsluCounter, 29679 mSDsCounter, 0 mSdLazyCounter, 328 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13193 SdHoareTripleChecker+Valid, 31223 SdHoareTripleChecker+Invalid, 562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 328 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 218 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:15,113 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13193 Valid, 31223 Invalid, 562 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [16 Valid, 328 Invalid, 0 Unknown, 218 Unchecked, 0.6s Time] [2021-11-23 16:55:15,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2976 states. [2021-11-23 16:55:15,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2976 to 2595. [2021-11-23 16:55:15,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2595 states, 2593 states have (on average 1.5719244118781335) internal successors, (4076), 2594 states have internal predecessors, (4076), 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 16:55:15,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2595 states to 2595 states and 4076 transitions. [2021-11-23 16:55:15,231 INFO L78 Accepts]: Start accepts. Automaton has 2595 states and 4076 transitions. Word has length 84 [2021-11-23 16:55:15,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:15,231 INFO L470 AbstractCegarLoop]: Abstraction has 2595 states and 4076 transitions. [2021-11-23 16:55:15,231 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 4.1645569620253164) internal successors, (329), 79 states have internal predecessors, (329), 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 16:55:15,232 INFO L276 IsEmpty]: Start isEmpty. Operand 2595 states and 4076 transitions. [2021-11-23 16:55:15,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 16:55:15,232 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:15,233 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 16:55:15,243 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:15,434 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Ended with exit code 0 [2021-11-23 16:55:15,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:15,833 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:15,834 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:15,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:15,834 INFO L85 PathProgramCache]: Analyzing trace with hash -1099299449, now seen corresponding path program 1 times [2021-11-23 16:55:15,834 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:15,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [134716768] [2021-11-23 16:55:15,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:15,835 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:15,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:15,837 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:15,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-23 16:55:15,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:15,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 16:55:15,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:19,610 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 16:55:19,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:21,110 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 16:55:21,111 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:21,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [134716768] [2021-11-23 16:55:21,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [134716768] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:21,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [57259810] [2021-11-23 16:55:21,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:21,112 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:21,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:21,113 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:21,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-23 16:55:21,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:21,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:55:21,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:24,624 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 16:55:24,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:25,343 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 16:55:25,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [57259810] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:25,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083918087] [2021-11-23 16:55:25,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:25,345 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:25,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:55:25,347 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:55:25,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-23 16:55:25,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:25,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 16:55:25,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:29,409 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 16:55:29,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:31,906 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 16:55:31,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1083918087] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:31,906 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:55:31,906 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 17, 15, 17, 16] total 49 [2021-11-23 16:55:31,907 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468617399] [2021-11-23 16:55:31,907 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:55:31,907 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-23 16:55:31,908 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:31,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-23 16:55:31,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=1986, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 16:55:31,909 INFO L87 Difference]: Start difference. First operand 2595 states and 4076 transitions. Second operand has 49 states, 49 states have (on average 5.163265306122449) internal successors, (253), 49 states have internal predecessors, (253), 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 16:55:32,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:32,361 INFO L93 Difference]: Finished difference Result 3329 states and 5006 transitions. [2021-11-23 16:55:32,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 16:55:32,361 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 5.163265306122449) internal successors, (253), 49 states have internal predecessors, (253), 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 16:55:32,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:32,365 INFO L225 Difference]: With dead ends: 3329 [2021-11-23 16:55:32,365 INFO L226 Difference]: Without dead ends: 2955 [2021-11-23 16:55:32,366 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 451 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 803 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=394, Invalid=2056, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 16:55:32,367 INFO L933 BasicCegarLoop]: 1547 mSDtfsCounter, 3112 mSDsluCounter, 17133 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3112 SdHoareTripleChecker+Valid, 18680 SdHoareTripleChecker+Invalid, 326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 242 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:32,367 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3112 Valid, 18680 Invalid, 326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 76 Invalid, 0 Unknown, 242 Unchecked, 0.1s Time] [2021-11-23 16:55:32,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2955 states. [2021-11-23 16:55:32,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2955 to 2595. [2021-11-23 16:55:32,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2595 states, 2593 states have (on average 1.5719244118781335) internal successors, (4076), 2594 states have internal predecessors, (4076), 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 16:55:32,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2595 states to 2595 states and 4076 transitions. [2021-11-23 16:55:32,486 INFO L78 Accepts]: Start accepts. Automaton has 2595 states and 4076 transitions. Word has length 84 [2021-11-23 16:55:32,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:32,487 INFO L470 AbstractCegarLoop]: Abstraction has 2595 states and 4076 transitions. [2021-11-23 16:55:32,487 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 5.163265306122449) internal successors, (253), 49 states have internal predecessors, (253), 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 16:55:32,487 INFO L276 IsEmpty]: Start isEmpty. Operand 2595 states and 4076 transitions. [2021-11-23 16:55:32,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 16:55:32,489 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:32,489 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 16:55:32,510 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Ended with exit code 0 [2021-11-23 16:55:32,707 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:32,931 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2021-11-23 16:55:33,105 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:33,106 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:33,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:33,106 INFO L85 PathProgramCache]: Analyzing trace with hash -169003638, now seen corresponding path program 1 times [2021-11-23 16:55:33,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:33,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2094507563] [2021-11-23 16:55:33,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:33,107 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:33,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:33,108 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:33,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 16:55:33,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:33,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:55:33,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:35,400 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 16:55:35,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:35,995 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 16:55:35,995 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:35,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2094507563] [2021-11-23 16:55:35,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2094507563] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:35,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [198945905] [2021-11-23 16:55:35,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:35,996 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:35,996 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:35,997 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:35,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2021-11-23 16:55:36,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:36,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:55:36,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:38,627 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 16:55:38,627 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:39,422 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 16:55:39,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [198945905] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:39,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [849021789] [2021-11-23 16:55:39,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:39,423 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:39,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:55:39,424 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:55:39,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 16:55:39,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:39,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 16:55:39,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:42,200 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 16:55:42,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:43,662 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 16:55:43,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [849021789] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:43,663 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:55:43,663 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 12, 10] total 45 [2021-11-23 16:55:43,663 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904711536] [2021-11-23 16:55:43,663 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:55:43,664 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-23 16:55:43,664 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:43,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-23 16:55:43,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1818, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 16:55:43,665 INFO L87 Difference]: Start difference. First operand 2595 states and 4076 transitions. Second operand has 45 states, 45 states have (on average 8.666666666666666) internal successors, (390), 45 states have internal predecessors, (390), 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 16:55:45,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:45,105 INFO L93 Difference]: Finished difference Result 2914 states and 4500 transitions. [2021-11-23 16:55:45,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 16:55:45,106 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 8.666666666666666) internal successors, (390), 45 states have internal predecessors, (390), 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 16:55:45,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:45,109 INFO L225 Difference]: With dead ends: 2914 [2021-11-23 16:55:45,109 INFO L226 Difference]: Without dead ends: 2528 [2021-11-23 16:55:45,110 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 460 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 728 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=315, Invalid=2877, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 16:55:45,111 INFO L933 BasicCegarLoop]: 1519 mSDtfsCounter, 118 mSDsluCounter, 28635 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 30154 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 168 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:45,111 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [118 Valid, 30154 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 55 Invalid, 0 Unknown, 168 Unchecked, 0.1s Time] [2021-11-23 16:55:45,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2528 states. [2021-11-23 16:55:45,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2528 to 2528. [2021-11-23 16:55:45,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2528 states, 2526 states have (on average 1.5787806809184481) internal successors, (3988), 2527 states have internal predecessors, (3988), 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 16:55:45,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2528 states to 2528 states and 3988 transitions. [2021-11-23 16:55:45,194 INFO L78 Accepts]: Start accepts. Automaton has 2528 states and 3988 transitions. Word has length 84 [2021-11-23 16:55:45,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:45,195 INFO L470 AbstractCegarLoop]: Abstraction has 2528 states and 3988 transitions. [2021-11-23 16:55:45,195 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 8.666666666666666) internal successors, (390), 45 states have internal predecessors, (390), 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 16:55:45,195 INFO L276 IsEmpty]: Start isEmpty. Operand 2528 states and 3988 transitions. [2021-11-23 16:55:45,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 16:55:45,196 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:45,196 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] [2021-11-23 16:55:45,208 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:45,423 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2021-11-23 16:55:45,598 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:45,797 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:45,797 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:45,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:45,797 INFO L85 PathProgramCache]: Analyzing trace with hash -1655139731, now seen corresponding path program 1 times [2021-11-23 16:55:45,798 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:45,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [43871847] [2021-11-23 16:55:45,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:45,798 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:45,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:45,799 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:45,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 16:55:45,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:45,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:55:45,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:46,360 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 16:55:46,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:46,697 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 16:55:46,697 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:46,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [43871847] [2021-11-23 16:55:46,697 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [43871847] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:46,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [910032647] [2021-11-23 16:55:46,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:46,698 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:46,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:46,699 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:46,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-23 16:55:46,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:46,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:55:46,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:46,948 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 16:55:46,948 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:55:46,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [910032647] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:55:46,948 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:55:46,948 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 16:55:46,948 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994463866] [2021-11-23 16:55:46,949 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:55:46,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:55:46,949 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:46,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:55:46,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:55:46,950 INFO L87 Difference]: Start difference. First operand 2528 states and 3988 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 16:55:47,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:47,077 INFO L93 Difference]: Finished difference Result 3322 states and 5026 transitions. [2021-11-23 16:55:47,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:55:47,078 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 85 [2021-11-23 16:55:47,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:47,082 INFO L225 Difference]: With dead ends: 3322 [2021-11-23 16:55:47,082 INFO L226 Difference]: Without dead ends: 2551 [2021-11-23 16:55:47,084 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 247 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 16:55:47,085 INFO L933 BasicCegarLoop]: 1535 mSDtfsCounter, 1496 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1496 SdHoareTripleChecker+Valid, 1597 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:47,086 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1496 Valid, 1597 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:55:47,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2551 states. [2021-11-23 16:55:47,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2551 to 2439. [2021-11-23 16:55:47,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2439 states, 2437 states have (on average 1.5876077144029546) internal successors, (3869), 2438 states have internal predecessors, (3869), 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 16:55:47,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2439 states to 2439 states and 3869 transitions. [2021-11-23 16:55:47,222 INFO L78 Accepts]: Start accepts. Automaton has 2439 states and 3869 transitions. Word has length 85 [2021-11-23 16:55:47,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:47,223 INFO L470 AbstractCegarLoop]: Abstraction has 2439 states and 3869 transitions. [2021-11-23 16:55:47,223 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 16:55:47,223 INFO L276 IsEmpty]: Start isEmpty. Operand 2439 states and 3869 transitions. [2021-11-23 16:55:47,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 16:55:47,224 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:47,224 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] [2021-11-23 16:55:47,226 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Ended with exit code 0 [2021-11-23 16:55:47,435 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Ended with exit code 0 [2021-11-23 16:55:47,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:55:47,625 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:47,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:47,626 INFO L85 PathProgramCache]: Analyzing trace with hash -2139020399, now seen corresponding path program 1 times [2021-11-23 16:55:47,626 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:47,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [505479931] [2021-11-23 16:55:47,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:47,626 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:47,627 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:47,627 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:47,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (62)] Waiting until timeout for monitored process [2021-11-23 16:55:47,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:47,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:55:47,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:49,956 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 16:55:49,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:50,516 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 16:55:50,517 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:50,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [505479931] [2021-11-23 16:55:50,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [505479931] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:50,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1904219698] [2021-11-23 16:55:50,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:50,517 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:50,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:50,518 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:50,520 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (63)] Waiting until timeout for monitored process [2021-11-23 16:55:50,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:50,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:55:50,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:52,675 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 16:55:52,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:53,046 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 16:55:53,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1904219698] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:53,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351179566] [2021-11-23 16:55:53,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:53,047 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:53,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:55:53,048 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:55:53,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-23 16:55:53,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:53,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:55:53,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:55,029 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 16:55:55,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:55,386 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 16:55:55,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351179566] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:55,386 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:55:55,387 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 10, 9] total 18 [2021-11-23 16:55:55,387 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437392674] [2021-11-23 16:55:55,387 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:55:55,388 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 16:55:55,388 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:55,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 16:55:55,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 16:55:55,389 INFO L87 Difference]: Start difference. First operand 2439 states and 3869 transitions. Second operand has 18 states, 18 states have (on average 8.38888888888889) internal successors, (151), 18 states have internal predecessors, (151), 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 16:55:55,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:55,670 INFO L93 Difference]: Finished difference Result 2650 states and 4149 transitions. [2021-11-23 16:55:55,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 16:55:55,671 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 8.38888888888889) internal successors, (151), 18 states have internal predecessors, (151), 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 16:55:55,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:55,674 INFO L225 Difference]: With dead ends: 2650 [2021-11-23 16:55:55,674 INFO L226 Difference]: Without dead ends: 2337 [2021-11-23 16:55:55,675 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 488 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-11-23 16:55:55,676 INFO L933 BasicCegarLoop]: 1526 mSDtfsCounter, 4380 mSDsluCounter, 13716 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4380 SdHoareTripleChecker+Valid, 15242 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 64 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:55,676 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4380 Valid, 15242 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 25 Invalid, 0 Unknown, 64 Unchecked, 0.1s Time] [2021-11-23 16:55:55,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2337 states. [2021-11-23 16:55:55,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2337 to 2326. [2021-11-23 16:55:55,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2326 states, 2324 states have (on average 1.601118760757315) internal successors, (3721), 2325 states have internal predecessors, (3721), 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 16:55:55,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2326 states to 2326 states and 3721 transitions. [2021-11-23 16:55:55,751 INFO L78 Accepts]: Start accepts. Automaton has 2326 states and 3721 transitions. Word has length 85 [2021-11-23 16:55:55,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:55,751 INFO L470 AbstractCegarLoop]: Abstraction has 2326 states and 3721 transitions. [2021-11-23 16:55:55,751 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 8.38888888888889) internal successors, (151), 18 states have internal predecessors, (151), 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 16:55:55,752 INFO L276 IsEmpty]: Start isEmpty. Operand 2326 states and 3721 transitions. [2021-11-23 16:55:55,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 16:55:55,752 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:55,753 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 16:55:55,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (63)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:55,963 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (62)] Ended with exit code 0 [2021-11-23 16:55:56,180 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:56,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:56,354 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:56,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:56,354 INFO L85 PathProgramCache]: Analyzing trace with hash 527848583, now seen corresponding path program 1 times [2021-11-23 16:55:56,355 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:56,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1688468359] [2021-11-23 16:55:56,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:56,355 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:56,355 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:56,356 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:56,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Waiting until timeout for monitored process [2021-11-23 16:55:56,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:56,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:55:56,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:58,496 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:58,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:59,081 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:55:59,081 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:59,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1688468359] [2021-11-23 16:55:59,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1688468359] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:59,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [980715331] [2021-11-23 16:55:59,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:55:59,082 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:59,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:59,085 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:59,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (66)] Waiting until timeout for monitored process [2021-11-23 16:55:59,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:59,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:55:59,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:01,297 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:01,297 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:01,647 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:01,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [980715331] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:01,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [703538859] [2021-11-23 16:56:01,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:01,648 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:56:01,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:56:01,649 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:56:01,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-23 16:56:01,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:01,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 16:56:01,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:04,961 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:04,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:07,034 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 16:56:07,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [703538859] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:07,034 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:56:07,035 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 14, 15] total 40 [2021-11-23 16:56:07,035 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148454971] [2021-11-23 16:56:07,035 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:56:07,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-23 16:56:07,036 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:07,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-23 16:56:07,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1379, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 16:56:07,037 INFO L87 Difference]: Start difference. First operand 2326 states and 3721 transitions. Second operand has 40 states, 40 states have (on average 6.925) internal successors, (277), 40 states have internal predecessors, (277), 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 16:56:07,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:56:07,582 INFO L93 Difference]: Finished difference Result 2561 states and 4025 transitions. [2021-11-23 16:56:07,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 16:56:07,583 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 6.925) internal successors, (277), 40 states have internal predecessors, (277), 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 16:56:07,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:56:07,586 INFO L225 Difference]: With dead ends: 2561 [2021-11-23 16:56:07,586 INFO L226 Difference]: Without dead ends: 2288 [2021-11-23 16:56:07,587 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 473 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 527 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=211, Invalid=1595, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 16:56:07,588 INFO L933 BasicCegarLoop]: 1520 mSDtfsCounter, 2959 mSDsluCounter, 28714 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2959 SdHoareTripleChecker+Valid, 30234 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 123 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:56:07,588 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2959 Valid, 30234 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 66 Invalid, 0 Unknown, 123 Unchecked, 0.1s Time] [2021-11-23 16:56:07,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2288 states. [2021-11-23 16:56:07,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2288 to 2252. [2021-11-23 16:56:07,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2252 states, 2250 states have (on average 1.6111111111111112) internal successors, (3625), 2251 states have internal predecessors, (3625), 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 16:56:07,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2252 states to 2252 states and 3625 transitions. [2021-11-23 16:56:07,658 INFO L78 Accepts]: Start accepts. Automaton has 2252 states and 3625 transitions. Word has length 86 [2021-11-23 16:56:07,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:56:07,658 INFO L470 AbstractCegarLoop]: Abstraction has 2252 states and 3625 transitions. [2021-11-23 16:56:07,659 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 6.925) internal successors, (277), 40 states have internal predecessors, (277), 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 16:56:07,659 INFO L276 IsEmpty]: Start isEmpty. Operand 2252 states and 3625 transitions. [2021-11-23 16:56:07,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-23 16:56:07,660 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:56:07,660 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:56:07,662 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (66)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:07,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:08,090 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:08,261 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:56:08,262 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:56:08,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:56:08,262 INFO L85 PathProgramCache]: Analyzing trace with hash -1217075708, now seen corresponding path program 1 times [2021-11-23 16:56:08,263 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:56:08,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1979123844] [2021-11-23 16:56:08,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:08,263 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:56:08,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:56:08,264 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:56:08,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Waiting until timeout for monitored process [2021-11-23 16:56:08,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:08,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:56:08,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:08,718 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 57 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:08,718 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:56:08,718 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:08,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1979123844] [2021-11-23 16:56:08,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1979123844] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:56:08,719 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:56:08,719 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 16:56:08,719 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199754465] [2021-11-23 16:56:08,719 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:56:08,719 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:56:08,720 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:08,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:56:08,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:56:08,721 INFO L87 Difference]: Start difference. First operand 2252 states and 3625 transitions. Second operand has 3 states, 3 states have (on average 42.0) internal successors, (126), 2 states have internal predecessors, (126), 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 16:56:49,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:56:49,106 INFO L93 Difference]: Finished difference Result 5260 states and 8961 transitions. [2021-11-23 16:56:49,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:56:49,119 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 42.0) internal successors, (126), 2 states have internal predecessors, (126), 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 126 [2021-11-23 16:56:49,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:56:49,124 INFO L225 Difference]: With dead ends: 5260 [2021-11-23 16:56:49,124 INFO L226 Difference]: Without dead ends: 3756 [2021-11-23 16:56:49,126 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 124 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 16:56:49,127 INFO L933 BasicCegarLoop]: 445 mSDtfsCounter, 1023 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 2524 mSolverCounterSat, 335 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 33.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1023 SdHoareTripleChecker+Valid, 452 SdHoareTripleChecker+Invalid, 2859 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 335 IncrementalHoareTripleChecker+Valid, 2524 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 40.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:56:49,129 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1023 Valid, 452 Invalid, 2859 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [335 Valid, 2524 Invalid, 0 Unknown, 0 Unchecked, 40.2s Time] [2021-11-23 16:56:49,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3756 states. [2021-11-23 16:56:49,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3756 to 3754. [2021-11-23 16:56:49,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3754 states, 3752 states have (on average 1.523454157782516) internal successors, (5716), 3753 states have internal predecessors, (5716), 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 16:56:49,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3754 states to 3754 states and 5716 transitions. [2021-11-23 16:56:49,297 INFO L78 Accepts]: Start accepts. Automaton has 3754 states and 5716 transitions. Word has length 126 [2021-11-23 16:56:49,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:56:49,297 INFO L470 AbstractCegarLoop]: Abstraction has 3754 states and 5716 transitions. [2021-11-23 16:56:49,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 42.0) internal successors, (126), 2 states have internal predecessors, (126), 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 16:56:49,297 INFO L276 IsEmpty]: Start isEmpty. Operand 3754 states and 5716 transitions. [2021-11-23 16:56:49,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-23 16:56:49,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:56:49,300 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 16:56:49,328 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Ended with exit code 0 [2021-11-23 16:56:49,515 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:56:49,515 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:56:49,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:56:49,516 INFO L85 PathProgramCache]: Analyzing trace with hash -1263537355, now seen corresponding path program 1 times [2021-11-23 16:56:49,517 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:56:49,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [621471875] [2021-11-23 16:56:49,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:56:49,518 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:56:49,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:56:49,519 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:56:49,520 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2021-11-23 16:56:49,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:49,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:56:49,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:50,999 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 57 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:56:50,999 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:56:50,999 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:50,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [621471875] [2021-11-23 16:56:50,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [621471875] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:56:50,999 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:56:51,000 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:56:51,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682966980] [2021-11-23 16:56:51,000 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:56:51,000 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:56:51,000 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:51,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:56:51,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:56:51,001 INFO L87 Difference]: Start difference. First operand 3754 states and 5716 transitions. Second operand has 4 states, 4 states have (on average 33.0) internal successors, (132), 3 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 16:57:29,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:29,295 INFO L93 Difference]: Finished difference Result 8299 states and 12603 transitions. [2021-11-23 16:57:29,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:57:29,296 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 33.0) internal successors, (132), 3 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 132 [2021-11-23 16:57:29,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:29,302 INFO L225 Difference]: With dead ends: 8299 [2021-11-23 16:57:29,302 INFO L226 Difference]: Without dead ends: 5256 [2021-11-23 16:57:29,306 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:57:29,307 INFO L933 BasicCegarLoop]: 713 mSDtfsCounter, 802 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 3101 mSolverCounterSat, 242 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 31.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 802 SdHoareTripleChecker+Valid, 825 SdHoareTripleChecker+Invalid, 3343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 242 IncrementalHoareTripleChecker+Valid, 3101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 38.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:29,307 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [802 Valid, 825 Invalid, 3343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [242 Valid, 3101 Invalid, 0 Unknown, 0 Unchecked, 38.1s Time] [2021-11-23 16:57:29,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5256 states. [2021-11-23 16:57:29,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5256 to 5256. [2021-11-23 16:57:29,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5256 states, 5254 states have (on average 1.4090216977540921) internal successors, (7403), 5255 states have internal predecessors, (7403), 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 16:57:29,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5256 states to 5256 states and 7403 transitions. [2021-11-23 16:57:29,474 INFO L78 Accepts]: Start accepts. Automaton has 5256 states and 7403 transitions. Word has length 132 [2021-11-23 16:57:29,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:29,475 INFO L470 AbstractCegarLoop]: Abstraction has 5256 states and 7403 transitions. [2021-11-23 16:57:29,475 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 33.0) internal successors, (132), 3 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 16:57:29,475 INFO L276 IsEmpty]: Start isEmpty. Operand 5256 states and 7403 transitions. [2021-11-23 16:57:29,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 16:57:29,477 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:29,477 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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, 1] [2021-11-23 16:57:29,493 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Ended with exit code 0 [2021-11-23 16:57:29,693 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:57:29,693 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:29,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:29,694 INFO L85 PathProgramCache]: Analyzing trace with hash -526226132, now seen corresponding path program 1 times [2021-11-23 16:57:29,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:29,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [897473319] [2021-11-23 16:57:29,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:29,694 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:29,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:29,695 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:29,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (70)] Waiting until timeout for monitored process [2021-11-23 16:57:29,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:29,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:57:29,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:32,592 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 70 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:57:32,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:33,605 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 70 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 16:57:33,606 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:33,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [897473319] [2021-11-23 16:57:33,606 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [897473319] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:33,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [879844620] [2021-11-23 16:57:33,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:33,606 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:57:33,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:57:33,608 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:57:33,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (71)] Waiting until timeout for monitored process [2021-11-23 16:57:33,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:33,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:57:33,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:37,889 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:37,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:39,469 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:39,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [879844620] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:39,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435648790] [2021-11-23 16:57:39,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:39,470 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:57:39,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:57:39,472 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:57:39,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2021-11-23 16:57:39,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:39,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:57:39,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:42,927 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 72 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:57:42,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:44,040 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 72 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:57:44,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435648790] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:44,041 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:57:44,041 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 49 [2021-11-23 16:57:44,042 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000982254] [2021-11-23 16:57:44,042 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:57:44,043 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-23 16:57:44,043 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:57:44,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-23 16:57:44,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=2242, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 16:57:44,044 INFO L87 Difference]: Start difference. First operand 5256 states and 7403 transitions. Second operand has 50 states, 50 states have (on average 12.18) internal successors, (609), 49 states have internal predecessors, (609), 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 16:57:47,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:57:47,070 INFO L93 Difference]: Finished difference Result 5943 states and 8297 transitions. [2021-11-23 16:57:47,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 16:57:47,071 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 12.18) internal successors, (609), 49 states have internal predecessors, (609), 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 135 [2021-11-23 16:57:47,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:57:47,077 INFO L225 Difference]: With dead ends: 5943 [2021-11-23 16:57:47,077 INFO L226 Difference]: Without dead ends: 5294 [2021-11-23 16:57:47,079 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 833 GetRequests, 764 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1159 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=456, Invalid=4374, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 16:57:47,080 INFO L933 BasicCegarLoop]: 1517 mSDtfsCounter, 13119 mSDsluCounter, 43659 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13119 SdHoareTripleChecker+Valid, 45176 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 165 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:57:47,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13119 Valid, 45176 Invalid, 262 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [9 Valid, 88 Invalid, 0 Unknown, 165 Unchecked, 0.1s Time] [2021-11-23 16:57:47,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5294 states. [2021-11-23 16:57:47,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5294 to 5294. [2021-11-23 16:57:47,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5294 states, 5292 states have (on average 1.40702947845805) internal successors, (7446), 5293 states have internal predecessors, (7446), 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 16:57:47,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5294 states to 5294 states and 7446 transitions. [2021-11-23 16:57:47,311 INFO L78 Accepts]: Start accepts. Automaton has 5294 states and 7446 transitions. Word has length 135 [2021-11-23 16:57:47,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:57:47,312 INFO L470 AbstractCegarLoop]: Abstraction has 5294 states and 7446 transitions. [2021-11-23 16:57:47,312 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 12.18) internal successors, (609), 49 states have internal predecessors, (609), 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 16:57:47,312 INFO L276 IsEmpty]: Start isEmpty. Operand 5294 states and 7446 transitions. [2021-11-23 16:57:47,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 16:57:47,314 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:57:47,314 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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 16:57:47,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (71)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:47,528 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (70)] Ended with exit code 0 [2021-11-23 16:57:47,743 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Forceful destruction successful, exit code 0 [2021-11-23 16:57:47,917 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:57:47,917 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:57:47,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:57:47,918 INFO L85 PathProgramCache]: Analyzing trace with hash -949872854, now seen corresponding path program 1 times [2021-11-23 16:57:47,918 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:57:47,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1215129158] [2021-11-23 16:57:47,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:47,918 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:57:47,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:57:47,920 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:57:47,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (73)] Waiting until timeout for monitored process [2021-11-23 16:57:48,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:48,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:57:48,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:50,837 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 66 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:57:50,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:52,007 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 66 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 16:57:52,007 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:57:52,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1215129158] [2021-11-23 16:57:52,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1215129158] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:52,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1961419568] [2021-11-23 16:57:52,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:52,008 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:57:52,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:57:52,009 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:57:52,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (74)] Waiting until timeout for monitored process [2021-11-23 16:57:52,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:52,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:57:52,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:57:56,636 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:56,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:57:58,071 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:57:58,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1961419568] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:57:58,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2140836198] [2021-11-23 16:57:58,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:57:58,072 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:57:58,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:57:58,073 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:57:58,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2021-11-23 16:57:58,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:57:58,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:57:58,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:01,331 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 72 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:58:01,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:02,381 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 72 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:58:02,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2140836198] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:02,381 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:58:02,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 16:58:02,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662024018] [2021-11-23 16:58:02,382 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:58:02,383 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 16:58:02,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:58:02,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 16:58:02,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 16:58:02,384 INFO L87 Difference]: Start difference. First operand 5294 states and 7446 transitions. Second operand has 48 states, 48 states have (on average 12.625) internal successors, (606), 47 states have internal predecessors, (606), 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 16:58:05,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:58:05,196 INFO L93 Difference]: Finished difference Result 6217 states and 8627 transitions. [2021-11-23 16:58:05,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 16:58:05,197 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 12.625) internal successors, (606), 47 states have internal predecessors, (606), 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 135 [2021-11-23 16:58:05,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:58:05,204 INFO L225 Difference]: With dead ends: 6217 [2021-11-23 16:58:05,204 INFO L226 Difference]: Without dead ends: 5572 [2021-11-23 16:58:05,206 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 834 GetRequests, 765 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1121 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=467, Invalid=4089, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 16:58:05,207 INFO L933 BasicCegarLoop]: 1537 mSDtfsCounter, 13269 mSDsluCounter, 37156 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13269 SdHoareTripleChecker+Valid, 38693 SdHoareTripleChecker+Invalid, 377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 300 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:58:05,207 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13269 Valid, 38693 Invalid, 377 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [10 Valid, 67 Invalid, 0 Unknown, 300 Unchecked, 0.1s Time] [2021-11-23 16:58:05,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5572 states. [2021-11-23 16:58:05,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5572 to 5568. [2021-11-23 16:58:05,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5568 states, 5566 states have (on average 1.3968738771110312) internal successors, (7775), 5567 states have internal predecessors, (7775), 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 16:58:05,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5568 states to 5568 states and 7775 transitions. [2021-11-23 16:58:05,394 INFO L78 Accepts]: Start accepts. Automaton has 5568 states and 7775 transitions. Word has length 135 [2021-11-23 16:58:05,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:58:05,394 INFO L470 AbstractCegarLoop]: Abstraction has 5568 states and 7775 transitions. [2021-11-23 16:58:05,394 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 12.625) internal successors, (606), 47 states have internal predecessors, (606), 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 16:58:05,395 INFO L276 IsEmpty]: Start isEmpty. Operand 5568 states and 7775 transitions. [2021-11-23 16:58:05,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 16:58:05,397 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:58:05,397 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 16:58:05,412 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (73)] Ended with exit code 0 [2021-11-23 16:58:05,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (74)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:05,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:06,009 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:58:06,010 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:06,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:06,010 INFO L85 PathProgramCache]: Analyzing trace with hash -1609404376, now seen corresponding path program 1 times [2021-11-23 16:58:06,010 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:06,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [723801233] [2021-11-23 16:58:06,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:06,011 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:06,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:06,012 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:06,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Waiting until timeout for monitored process [2021-11-23 16:58:06,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:06,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:58:06,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:09,341 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:09,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:10,562 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:10,563 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:58:10,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [723801233] [2021-11-23 16:58:10,563 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [723801233] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:10,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [424114138] [2021-11-23 16:58:10,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:10,563 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:58:10,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:58:10,564 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:58:10,565 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Waiting until timeout for monitored process [2021-11-23 16:58:10,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:10,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:58:10,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:13,479 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:13,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:14,234 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:14,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [424114138] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:14,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878222376] [2021-11-23 16:58:14,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:14,235 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:58:14,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:58:14,236 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:58:14,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2021-11-23 16:58:14,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:14,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:58:14,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:16,589 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 58 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 16:58:16,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:17,892 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 58 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 16:58:17,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [878222376] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:17,892 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:58:17,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:58:17,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805614007] [2021-11-23 16:58:17,893 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:58:17,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:58:17,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:58:17,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:58:17,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:58:17,895 INFO L87 Difference]: Start difference. First operand 5568 states and 7775 transitions. Second operand has 34 states, 34 states have (on average 12.147058823529411) internal successors, (413), 33 states have internal predecessors, (413), 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 16:58:18,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:58:18,901 INFO L93 Difference]: Finished difference Result 6227 states and 8625 transitions. [2021-11-23 16:58:18,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 16:58:18,902 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.147058823529411) internal successors, (413), 33 states have internal predecessors, (413), 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 135 [2021-11-23 16:58:18,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:58:18,910 INFO L225 Difference]: With dead ends: 6227 [2021-11-23 16:58:18,911 INFO L226 Difference]: Without dead ends: 5625 [2021-11-23 16:58:18,914 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 776 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=236, Invalid=1656, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 16:58:18,914 INFO L933 BasicCegarLoop]: 1532 mSDtfsCounter, 5914 mSDsluCounter, 27495 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5914 SdHoareTripleChecker+Valid, 29027 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 126 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:58:18,915 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5914 Valid, 29027 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 36 Invalid, 0 Unknown, 126 Unchecked, 0.1s Time] [2021-11-23 16:58:18,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5625 states. [2021-11-23 16:58:19,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5625 to 5623. [2021-11-23 16:58:19,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5623 states, 5621 states have (on average 1.393702188222736) internal successors, (7834), 5622 states have internal predecessors, (7834), 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 16:58:19,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5623 states to 5623 states and 7834 transitions. [2021-11-23 16:58:19,136 INFO L78 Accepts]: Start accepts. Automaton has 5623 states and 7834 transitions. Word has length 135 [2021-11-23 16:58:19,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:58:19,136 INFO L470 AbstractCegarLoop]: Abstraction has 5623 states and 7834 transitions. [2021-11-23 16:58:19,136 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.147058823529411) internal successors, (413), 33 states have internal predecessors, (413), 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 16:58:19,136 INFO L276 IsEmpty]: Start isEmpty. Operand 5623 states and 7834 transitions. [2021-11-23 16:58:19,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 16:58:19,138 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:58:19,139 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 16:58:19,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (77)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:19,351 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (76)] Ended with exit code 0 [2021-11-23 16:58:19,567 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:19,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:58:19,741 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:19,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:19,742 INFO L85 PathProgramCache]: Analyzing trace with hash -1588644728, now seen corresponding path program 1 times [2021-11-23 16:58:19,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:19,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1441937162] [2021-11-23 16:58:19,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:19,742 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:19,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:19,744 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:19,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Waiting until timeout for monitored process [2021-11-23 16:58:19,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:19,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:58:19,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:23,128 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:23,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:24,415 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:24,415 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:58:24,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1441937162] [2021-11-23 16:58:24,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1441937162] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:24,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1378770521] [2021-11-23 16:58:24,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:24,415 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:58:24,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:58:24,417 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:58:24,418 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Waiting until timeout for monitored process [2021-11-23 16:58:24,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:24,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:58:24,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:27,445 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:27,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:28,288 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:28,288 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1378770521] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:28,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962814204] [2021-11-23 16:58:28,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:28,289 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:58:28,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:58:28,290 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:58:28,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-23 16:58:28,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:28,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:58:28,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:31,209 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 73 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:58:31,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:32,227 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 38 proven. 73 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:58:32,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962814204] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:32,228 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:58:32,228 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:58:32,228 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217431502] [2021-11-23 16:58:32,228 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:58:32,229 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:58:32,229 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:58:32,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:58:32,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:58:32,230 INFO L87 Difference]: Start difference. First operand 5623 states and 7834 transitions. Second operand has 34 states, 34 states have (on average 12.470588235294118) internal successors, (424), 33 states have internal predecessors, (424), 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 16:58:33,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:58:33,388 INFO L93 Difference]: Finished difference Result 6371 states and 8794 transitions. [2021-11-23 16:58:33,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 16:58:33,388 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.470588235294118) internal successors, (424), 33 states have internal predecessors, (424), 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 135 [2021-11-23 16:58:33,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:58:33,396 INFO L225 Difference]: With dead ends: 6371 [2021-11-23 16:58:33,397 INFO L226 Difference]: Without dead ends: 5677 [2021-11-23 16:58:33,399 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 776 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=251, Invalid=1641, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 16:58:33,400 INFO L933 BasicCegarLoop]: 1536 mSDtfsCounter, 10221 mSDsluCounter, 26189 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10221 SdHoareTripleChecker+Valid, 27725 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 181 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:58:33,401 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10221 Valid, 27725 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 80 Invalid, 0 Unknown, 181 Unchecked, 0.1s Time] [2021-11-23 16:58:33,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5677 states. [2021-11-23 16:58:33,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5677 to 5677. [2021-11-23 16:58:33,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5677 states, 5675 states have (on average 1.3913656387665199) internal successors, (7896), 5676 states have internal predecessors, (7896), 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 16:58:33,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5677 states to 5677 states and 7896 transitions. [2021-11-23 16:58:33,615 INFO L78 Accepts]: Start accepts. Automaton has 5677 states and 7896 transitions. Word has length 135 [2021-11-23 16:58:33,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:58:33,616 INFO L470 AbstractCegarLoop]: Abstraction has 5677 states and 7896 transitions. [2021-11-23 16:58:33,616 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.470588235294118) internal successors, (424), 33 states have internal predecessors, (424), 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 16:58:33,616 INFO L276 IsEmpty]: Start isEmpty. Operand 5677 states and 7896 transitions. [2021-11-23 16:58:33,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 16:58:33,619 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:58:33,619 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 16:58:33,653 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Ended with exit code 0 [2021-11-23 16:58:33,851 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (79)] Ended with exit code 0 [2021-11-23 16:58:34,042 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (80)] Ended with exit code 0 [2021-11-23 16:58:34,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:58:34,241 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:34,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:34,242 INFO L85 PathProgramCache]: Analyzing trace with hash 1815989338, now seen corresponding path program 1 times [2021-11-23 16:58:34,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:34,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [724530233] [2021-11-23 16:58:34,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:34,242 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:34,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:34,243 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:34,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Waiting until timeout for monitored process [2021-11-23 16:58:34,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:34,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:58:34,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:38,195 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:38,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:39,223 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:39,223 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:58:39,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [724530233] [2021-11-23 16:58:39,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [724530233] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:39,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1288650951] [2021-11-23 16:58:39,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:39,225 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:58:39,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:58:39,228 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:58:39,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Waiting until timeout for monitored process [2021-11-23 16:58:39,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:39,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:58:39,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:42,790 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:42,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:43,397 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:43,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1288650951] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:43,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [986237037] [2021-11-23 16:58:43,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:43,398 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:58:43,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:58:43,399 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:58:43,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-23 16:58:43,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:43,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:58:43,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:46,589 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 80 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:58:46,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:47,698 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 24 proven. 80 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:58:47,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [986237037] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:47,698 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:58:47,698 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:58:47,699 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756263539] [2021-11-23 16:58:47,699 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:58:47,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:58:47,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:58:47,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:58:47,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:58:47,700 INFO L87 Difference]: Start difference. First operand 5677 states and 7896 transitions. Second operand has 34 states, 34 states have (on average 12.911764705882353) internal successors, (439), 33 states have internal predecessors, (439), 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 16:58:48,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:58:48,836 INFO L93 Difference]: Finished difference Result 6654 states and 9113 transitions. [2021-11-23 16:58:48,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 16:58:48,837 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.911764705882353) internal successors, (439), 33 states have internal predecessors, (439), 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 135 [2021-11-23 16:58:48,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:58:48,844 INFO L225 Difference]: With dead ends: 6654 [2021-11-23 16:58:48,844 INFO L226 Difference]: Without dead ends: 5978 [2021-11-23 16:58:48,846 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 817 GetRequests, 775 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=258, Invalid=1634, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 16:58:48,847 INFO L933 BasicCegarLoop]: 1539 mSDtfsCounter, 13094 mSDsluCounter, 21913 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13094 SdHoareTripleChecker+Valid, 23452 SdHoareTripleChecker+Invalid, 346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 248 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:58:48,847 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13094 Valid, 23452 Invalid, 346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 90 Invalid, 0 Unknown, 248 Unchecked, 0.1s Time] [2021-11-23 16:58:48,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5978 states. [2021-11-23 16:58:49,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5978 to 5978. [2021-11-23 16:58:49,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5978 states, 5976 states have (on average 1.3786813922356091) internal successors, (8239), 5977 states have internal predecessors, (8239), 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 16:58:49,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5978 states to 5978 states and 8239 transitions. [2021-11-23 16:58:49,094 INFO L78 Accepts]: Start accepts. Automaton has 5978 states and 8239 transitions. Word has length 135 [2021-11-23 16:58:49,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:58:49,094 INFO L470 AbstractCegarLoop]: Abstraction has 5978 states and 8239 transitions. [2021-11-23 16:58:49,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.911764705882353) internal successors, (439), 33 states have internal predecessors, (439), 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 16:58:49,095 INFO L276 IsEmpty]: Start isEmpty. Operand 5978 states and 8239 transitions. [2021-11-23 16:58:49,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 16:58:49,096 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:58:49,097 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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, 1, 1, 1] [2021-11-23 16:58:49,108 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (82)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:49,299 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (83)] Ended with exit code 0 [2021-11-23 16:58:49,523 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Ended with exit code 0 [2021-11-23 16:58:49,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:58:49,698 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:49,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:49,698 INFO L85 PathProgramCache]: Analyzing trace with hash 367260206, now seen corresponding path program 1 times [2021-11-23 16:58:49,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:49,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1038537161] [2021-11-23 16:58:49,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:49,699 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:49,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:49,709 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:49,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Waiting until timeout for monitored process [2021-11-23 16:58:49,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:49,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:58:49,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:52,434 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 74 proven. 28 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:58:52,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:53,288 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 74 proven. 28 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 16:58:53,289 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:58:53,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1038537161] [2021-11-23 16:58:53,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1038537161] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:53,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1171764295] [2021-11-23 16:58:53,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:53,290 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:58:53,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:58:53,291 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:58:53,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (86)] Waiting until timeout for monitored process [2021-11-23 16:58:53,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:53,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:58:53,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:56,233 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:56,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:57,544 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:58:57,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1171764295] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:57,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1688356135] [2021-11-23 16:58:57,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:58:57,545 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:58:57,545 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:58:57,546 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:58:57,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2021-11-23 16:58:57,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:58:57,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:58:57,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:00,543 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 72 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:59:00,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:01,649 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 72 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 16:59:01,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1688356135] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:01,650 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:59:01,650 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 16:59:01,650 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064451037] [2021-11-23 16:59:01,650 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:59:01,651 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 16:59:01,651 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:01,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 16:59:01,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 16:59:01,652 INFO L87 Difference]: Start difference. First operand 5978 states and 8239 transitions. Second operand has 39 states, 39 states have (on average 14.256410256410257) internal successors, (556), 38 states have internal predecessors, (556), 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 16:59:03,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:03,810 INFO L93 Difference]: Finished difference Result 6898 states and 9417 transitions. [2021-11-23 16:59:03,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 16:59:03,811 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 14.256410256410257) internal successors, (556), 38 states have internal predecessors, (556), 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 135 [2021-11-23 16:59:03,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:03,818 INFO L225 Difference]: With dead ends: 6898 [2021-11-23 16:59:03,818 INFO L226 Difference]: Without dead ends: 6143 [2021-11-23 16:59:03,821 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 829 GetRequests, 772 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 766 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=386, Invalid=2806, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 16:59:03,822 INFO L933 BasicCegarLoop]: 1523 mSDtfsCounter, 13194 mSDsluCounter, 27482 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13194 SdHoareTripleChecker+Valid, 29005 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 148 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:03,822 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13194 Valid, 29005 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 112 Invalid, 0 Unknown, 148 Unchecked, 0.1s Time] [2021-11-23 16:59:03,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6143 states. [2021-11-23 16:59:04,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6143 to 6133. [2021-11-23 16:59:04,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6133 states, 6131 states have (on average 1.3735116620453434) internal successors, (8421), 6132 states have internal predecessors, (8421), 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 16:59:04,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6133 states to 6133 states and 8421 transitions. [2021-11-23 16:59:04,082 INFO L78 Accepts]: Start accepts. Automaton has 6133 states and 8421 transitions. Word has length 135 [2021-11-23 16:59:04,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:04,083 INFO L470 AbstractCegarLoop]: Abstraction has 6133 states and 8421 transitions. [2021-11-23 16:59:04,083 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 14.256410256410257) internal successors, (556), 38 states have internal predecessors, (556), 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 16:59:04,083 INFO L276 IsEmpty]: Start isEmpty. Operand 6133 states and 8421 transitions. [2021-11-23 16:59:04,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 16:59:04,085 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:04,085 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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, 1, 1, 1] [2021-11-23 16:59:04,100 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (85)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:04,311 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Ended with exit code 0 [2021-11-23 16:59:04,489 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (86)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:04,686 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:04,686 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:04,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:04,687 INFO L85 PathProgramCache]: Analyzing trace with hash -541744850, now seen corresponding path program 1 times [2021-11-23 16:59:04,687 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:04,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [741020300] [2021-11-23 16:59:04,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:04,688 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:04,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:04,690 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:04,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (88)] Waiting until timeout for monitored process [2021-11-23 16:59:04,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:04,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:59:04,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:06,999 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 16:59:06,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:08,180 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 16:59:08,180 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:08,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [741020300] [2021-11-23 16:59:08,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [741020300] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:08,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1585685172] [2021-11-23 16:59:08,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:08,181 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:08,181 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:59:08,182 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:59:08,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (89)] Waiting until timeout for monitored process [2021-11-23 16:59:08,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:08,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:59:08,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:13,424 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 31 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:13,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:14,651 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 31 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:14,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1585685172] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:14,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [71248605] [2021-11-23 16:59:14,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:14,651 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:14,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:59:14,652 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:59:14,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2021-11-23 16:59:14,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:14,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:59:14,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:17,976 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 31 proven. 78 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:59:17,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:19,156 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 31 proven. 78 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 16:59:19,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [71248605] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:19,157 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:59:19,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 16:59:19,158 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166091638] [2021-11-23 16:59:19,158 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:59:19,159 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 16:59:19,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:19,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 16:59:19,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 16:59:19,161 INFO L87 Difference]: Start difference. First operand 6133 states and 8421 transitions. Second operand has 48 states, 48 states have (on average 12.875) internal successors, (618), 47 states have internal predecessors, (618), 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 16:59:21,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:21,692 INFO L93 Difference]: Finished difference Result 7049 states and 9597 transitions. [2021-11-23 16:59:21,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 16:59:21,693 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 12.875) internal successors, (618), 47 states have internal predecessors, (618), 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 135 [2021-11-23 16:59:21,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:21,701 INFO L225 Difference]: With dead ends: 7049 [2021-11-23 16:59:21,701 INFO L226 Difference]: Without dead ends: 6392 [2021-11-23 16:59:21,704 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 830 GetRequests, 763 SyntacticMatches, 3 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1078 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=408, Invalid=3882, Unknown=0, NotChecked=0, Total=4290 [2021-11-23 16:59:21,705 INFO L933 BasicCegarLoop]: 1538 mSDtfsCounter, 8878 mSDsluCounter, 44474 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8878 SdHoareTripleChecker+Valid, 46012 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 132 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:21,705 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8878 Valid, 46012 Invalid, 188 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [5 Valid, 51 Invalid, 0 Unknown, 132 Unchecked, 0.1s Time] [2021-11-23 16:59:21,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6392 states. [2021-11-23 16:59:21,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6392 to 6388. [2021-11-23 16:59:21,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6388 states, 6386 states have (on average 1.3665831506420294) internal successors, (8727), 6387 states have internal predecessors, (8727), 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 16:59:21,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6388 states to 6388 states and 8727 transitions. [2021-11-23 16:59:21,929 INFO L78 Accepts]: Start accepts. Automaton has 6388 states and 8727 transitions. Word has length 135 [2021-11-23 16:59:21,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:21,929 INFO L470 AbstractCegarLoop]: Abstraction has 6388 states and 8727 transitions. [2021-11-23 16:59:21,929 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 12.875) internal successors, (618), 47 states have internal predecessors, (618), 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 16:59:21,930 INFO L276 IsEmpty]: Start isEmpty. Operand 6388 states and 8727 transitions. [2021-11-23 16:59:21,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 16:59:21,932 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:21,932 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 16:59:21,943 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (88)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:22,159 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:22,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (89)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:22,533 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:22,533 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:22,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:22,533 INFO L85 PathProgramCache]: Analyzing trace with hash -1832472799, now seen corresponding path program 1 times [2021-11-23 16:59:22,534 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:22,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2129332146] [2021-11-23 16:59:22,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:22,534 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:22,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:22,535 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:22,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (91)] Waiting until timeout for monitored process [2021-11-23 16:59:22,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:22,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:59:22,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:24,061 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 94 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 16:59:24,062 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:59:24,062 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:24,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2129332146] [2021-11-23 16:59:24,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2129332146] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:59:24,063 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:59:24,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 16:59:24,063 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385014412] [2021-11-23 16:59:24,063 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:59:24,064 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:59:24,064 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:24,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:59:24,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:59:24,065 INFO L87 Difference]: Start difference. First operand 6388 states and 8727 transitions. Second operand has 6 states, 6 states have (on average 21.5) internal successors, (129), 5 states have internal predecessors, (129), 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 16:59:24,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:24,374 INFO L93 Difference]: Finished difference Result 7975 states and 10770 transitions. [2021-11-23 16:59:24,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:59:24,374 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 5 states have internal predecessors, (129), 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 136 [2021-11-23 16:59:24,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:24,383 INFO L225 Difference]: With dead ends: 7975 [2021-11-23 16:59:24,383 INFO L226 Difference]: Without dead ends: 7181 [2021-11-23 16:59:24,386 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 131 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 16:59:24,386 INFO L933 BasicCegarLoop]: 1536 mSDtfsCounter, 1494 mSDsluCounter, 3126 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1494 SdHoareTripleChecker+Valid, 4662 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 55 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:24,387 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1494 Valid, 4662 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 55 Unchecked, 0.0s Time] [2021-11-23 16:59:24,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7181 states. [2021-11-23 16:59:24,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7181 to 7179. [2021-11-23 16:59:24,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7179 states, 7177 states have (on average 1.3555803260415216) internal successors, (9729), 7178 states have internal predecessors, (9729), 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 16:59:24,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7179 states to 7179 states and 9729 transitions. [2021-11-23 16:59:24,771 INFO L78 Accepts]: Start accepts. Automaton has 7179 states and 9729 transitions. Word has length 136 [2021-11-23 16:59:24,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:24,772 INFO L470 AbstractCegarLoop]: Abstraction has 7179 states and 9729 transitions. [2021-11-23 16:59:24,772 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 5 states have internal predecessors, (129), 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 16:59:24,773 INFO L276 IsEmpty]: Start isEmpty. Operand 7179 states and 9729 transitions. [2021-11-23 16:59:24,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 16:59:24,776 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:24,777 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 16:59:24,794 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (91)] Ended with exit code 0 [2021-11-23 16:59:24,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:59:24,993 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:24,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:24,994 INFO L85 PathProgramCache]: Analyzing trace with hash 1802962975, now seen corresponding path program 1 times [2021-11-23 16:59:24,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:24,995 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [120299696] [2021-11-23 16:59:24,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:24,995 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:24,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:24,996 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:24,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Waiting until timeout for monitored process [2021-11-23 16:59:25,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:25,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:59:25,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:26,840 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 42 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 16:59:26,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:27,902 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 42 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 16:59:27,902 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:27,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [120299696] [2021-11-23 16:59:27,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [120299696] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:27,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [305500073] [2021-11-23 16:59:27,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:27,904 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:27,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:59:27,922 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:59:27,965 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Waiting until timeout for monitored process [2021-11-23 16:59:28,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:28,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:59:28,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:29,701 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 42 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 16:59:29,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:30,576 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 42 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 16:59:30,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [305500073] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:30,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [572868214] [2021-11-23 16:59:30,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:30,577 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:30,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:59:30,578 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:59:30,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2021-11-23 16:59:30,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:30,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:59:30,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:32,318 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 42 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 16:59:32,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:33,191 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 42 proven. 26 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 16:59:33,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [572868214] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:33,191 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:59:33,192 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 16:59:33,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070265067] [2021-11-23 16:59:33,192 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:59:33,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:59:33,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:33,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:59:33,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:59:33,193 INFO L87 Difference]: Start difference. First operand 7179 states and 9729 transitions. Second operand has 16 states, 16 states have (on average 12.1875) internal successors, (195), 15 states have internal predecessors, (195), 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 16:59:33,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:33,974 INFO L93 Difference]: Finished difference Result 9019 states and 12063 transitions. [2021-11-23 16:59:33,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 16:59:33,975 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 12.1875) internal successors, (195), 15 states have internal predecessors, (195), 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 136 [2021-11-23 16:59:33,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:33,988 INFO L225 Difference]: With dead ends: 9019 [2021-11-23 16:59:33,988 INFO L226 Difference]: Without dead ends: 8307 [2021-11-23 16:59:33,991 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 797 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=106, Invalid=400, Unknown=0, NotChecked=0, Total=506 [2021-11-23 16:59:33,992 INFO L933 BasicCegarLoop]: 1537 mSDtfsCounter, 4445 mSDsluCounter, 10851 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4445 SdHoareTripleChecker+Valid, 12388 SdHoareTripleChecker+Invalid, 183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 122 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:33,992 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4445 Valid, 12388 Invalid, 183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 59 Invalid, 0 Unknown, 122 Unchecked, 0.1s Time] [2021-11-23 16:59:34,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8307 states. [2021-11-23 16:59:34,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8307 to 8273. [2021-11-23 16:59:34,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8273 states, 8271 states have (on average 1.341192117035425) internal successors, (11093), 8272 states have internal predecessors, (11093), 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 16:59:34,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8273 states to 8273 states and 11093 transitions. [2021-11-23 16:59:34,430 INFO L78 Accepts]: Start accepts. Automaton has 8273 states and 11093 transitions. Word has length 136 [2021-11-23 16:59:34,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:34,431 INFO L470 AbstractCegarLoop]: Abstraction has 8273 states and 11093 transitions. [2021-11-23 16:59:34,431 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 12.1875) internal successors, (195), 15 states have internal predecessors, (195), 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 16:59:34,431 INFO L276 IsEmpty]: Start isEmpty. Operand 8273 states and 11093 transitions. [2021-11-23 16:59:34,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 16:59:34,434 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:34,434 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] [2021-11-23 16:59:34,440 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:34,646 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Ended with exit code 0 [2021-11-23 16:59:34,861 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Ended with exit code 0 [2021-11-23 16:59:35,035 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:35,035 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:35,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:35,036 INFO L85 PathProgramCache]: Analyzing trace with hash -499628542, now seen corresponding path program 1 times [2021-11-23 16:59:35,036 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:35,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2008810756] [2021-11-23 16:59:35,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:35,037 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:35,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:35,037 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:35,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Waiting until timeout for monitored process [2021-11-23 16:59:35,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:35,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:59:35,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:39,171 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:39,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:40,378 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:40,379 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:40,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2008810756] [2021-11-23 16:59:40,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2008810756] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:40,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [490789955] [2021-11-23 16:59:40,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:40,379 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:40,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:59:40,380 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:59:40,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Waiting until timeout for monitored process [2021-11-23 16:59:40,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:40,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:59:40,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:44,158 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:44,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:44,923 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:44,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [490789955] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:44,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1522150199] [2021-11-23 16:59:44,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:44,924 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:44,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:59:44,925 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:59:44,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2021-11-23 16:59:45,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:45,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:59:45,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:48,040 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 87 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:59:48,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:49,332 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 87 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:59:49,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1522150199] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:49,333 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:59:49,333 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 16:59:49,333 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764219900] [2021-11-23 16:59:49,334 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:59:49,334 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 16:59:49,334 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:49,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 16:59:49,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 16:59:49,335 INFO L87 Difference]: Start difference. First operand 8273 states and 11093 transitions. Second operand has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 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 16:59:50,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:50,616 INFO L93 Difference]: Finished difference Result 10262 states and 13578 transitions. [2021-11-23 16:59:50,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 16:59:50,616 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 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 136 [2021-11-23 16:59:50,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:50,626 INFO L225 Difference]: With dead ends: 10262 [2021-11-23 16:59:50,626 INFO L226 Difference]: Without dead ends: 8846 [2021-11-23 16:59:50,630 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 781 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 442 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=241, Invalid=1651, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 16:59:50,631 INFO L933 BasicCegarLoop]: 1543 mSDtfsCounter, 4438 mSDsluCounter, 29079 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4438 SdHoareTripleChecker+Valid, 30622 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 176 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:50,631 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4438 Valid, 30622 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 24 Invalid, 0 Unknown, 176 Unchecked, 0.0s Time] [2021-11-23 16:59:50,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8846 states. [2021-11-23 16:59:51,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8846 to 8802. [2021-11-23 16:59:51,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8802 states, 8800 states have (on average 1.3317045454545455) internal successors, (11719), 8801 states have internal predecessors, (11719), 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 16:59:51,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8802 states to 8802 states and 11719 transitions. [2021-11-23 16:59:51,114 INFO L78 Accepts]: Start accepts. Automaton has 8802 states and 11719 transitions. Word has length 136 [2021-11-23 16:59:51,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:51,114 INFO L470 AbstractCegarLoop]: Abstraction has 8802 states and 11719 transitions. [2021-11-23 16:59:51,114 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 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 16:59:51,114 INFO L276 IsEmpty]: Start isEmpty. Operand 8802 states and 11719 transitions. [2021-11-23 16:59:51,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 16:59:51,118 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:51,118 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 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] [2021-11-23 16:59:51,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:51,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:51,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:51,719 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:51,719 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:51,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:51,720 INFO L85 PathProgramCache]: Analyzing trace with hash 1161992403, now seen corresponding path program 1 times [2021-11-23 16:59:51,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:51,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2065903529] [2021-11-23 16:59:51,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:51,721 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:51,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:51,734 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:51,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Waiting until timeout for monitored process [2021-11-23 16:59:51,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:51,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:59:51,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:55,576 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 30 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:55,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:56,571 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 30 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:59:56,571 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:56,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2065903529] [2021-11-23 16:59:56,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2065903529] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:56,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1518742106] [2021-11-23 16:59:56,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:59:56,572 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:56,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:59:56,573 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:59:56,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Waiting until timeout for monitored process [2021-11-23 16:59:56,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:59:56,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:59:56,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:00,177 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 30 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:00,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:00,765 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 30 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:00,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1518742106] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:00,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2058650149] [2021-11-23 17:00:00,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:00,766 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:00,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:00,767 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:00:00,768 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2021-11-23 17:00:00,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:00,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:00:00,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:03,730 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 30 proven. 80 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:00:03,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:04,865 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 30 proven. 80 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:00:04,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2058650149] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:04,866 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:00:04,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:00:04,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519010873] [2021-11-23 17:00:04,866 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:00:04,867 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:00:04,867 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:04,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:00:04,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:00:04,868 INFO L87 Difference]: Start difference. First operand 8802 states and 11719 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 17:00:06,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:06,323 INFO L93 Difference]: Finished difference Result 10182 states and 13486 transitions. [2021-11-23 17:00:06,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:00:06,324 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 136 [2021-11-23 17:00:06,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:06,333 INFO L225 Difference]: With dead ends: 10182 [2021-11-23 17:00:06,333 INFO L226 Difference]: Without dead ends: 8873 [2021-11-23 17:00:06,336 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 781 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=257, Invalid=1635, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:00:06,337 INFO L933 BasicCegarLoop]: 1541 mSDtfsCounter, 8761 mSDsluCounter, 27796 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8761 SdHoareTripleChecker+Valid, 29337 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 166 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:06,337 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8761 Valid, 29337 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 89 Invalid, 0 Unknown, 166 Unchecked, 0.1s Time] [2021-11-23 17:00:06,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8873 states. [2021-11-23 17:00:06,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8873 to 8814. [2021-11-23 17:00:06,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8814 states, 8812 states have (on average 1.3314798002723558) internal successors, (11733), 8813 states have internal predecessors, (11733), 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 17:00:06,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8814 states to 8814 states and 11733 transitions. [2021-11-23 17:00:06,815 INFO L78 Accepts]: Start accepts. Automaton has 8814 states and 11733 transitions. Word has length 136 [2021-11-23 17:00:06,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:06,815 INFO L470 AbstractCegarLoop]: Abstraction has 8814 states and 11733 transitions. [2021-11-23 17:00:06,815 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 17:00:06,815 INFO L276 IsEmpty]: Start isEmpty. Operand 8814 states and 11733 transitions. [2021-11-23 17:00:06,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:00:06,819 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:06,819 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] [2021-11-23 17:00:06,833 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:07,021 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Ended with exit code 0 [2021-11-23 17:00:07,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:07,420 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:07,420 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:07,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:07,421 INFO L85 PathProgramCache]: Analyzing trace with hash 204673352, now seen corresponding path program 1 times [2021-11-23 17:00:07,421 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:07,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [59028811] [2021-11-23 17:00:07,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:07,422 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:07,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:07,423 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:07,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Waiting until timeout for monitored process [2021-11-23 17:00:07,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:07,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:00:07,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:11,532 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:11,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:12,673 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:12,674 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:12,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [59028811] [2021-11-23 17:00:12,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [59028811] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:12,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [767584743] [2021-11-23 17:00:12,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:12,674 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:12,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:00:12,676 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:00:12,677 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Waiting until timeout for monitored process [2021-11-23 17:00:12,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:12,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:00:12,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:16,407 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:16,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:17,169 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:17,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [767584743] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:17,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1800075355] [2021-11-23 17:00:17,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:17,169 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:17,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:17,170 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:00:17,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2021-11-23 17:00:17,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:17,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:00:17,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:20,201 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 87 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:00:20,202 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:21,467 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 16 proven. 87 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:00:21,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1800075355] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:21,468 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:00:21,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:00:21,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464039312] [2021-11-23 17:00:21,468 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:00:21,469 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:00:21,469 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:21,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:00:21,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:00:21,470 INFO L87 Difference]: Start difference. First operand 8814 states and 11733 transitions. Second operand has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 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 17:00:22,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:22,872 INFO L93 Difference]: Finished difference Result 10370 states and 13702 transitions. [2021-11-23 17:00:22,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:00:22,873 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 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 136 [2021-11-23 17:00:22,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:22,884 INFO L225 Difference]: With dead ends: 10370 [2021-11-23 17:00:22,884 INFO L226 Difference]: Without dead ends: 9050 [2021-11-23 17:00:22,887 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 825 GetRequests, 783 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=257, Invalid=1635, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:00:22,888 INFO L933 BasicCegarLoop]: 1544 mSDtfsCounter, 8801 mSDsluCounter, 23251 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8801 SdHoareTripleChecker+Valid, 24795 SdHoareTripleChecker+Invalid, 364 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 253 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:22,888 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8801 Valid, 24795 Invalid, 364 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 105 Invalid, 0 Unknown, 253 Unchecked, 0.1s Time] [2021-11-23 17:00:22,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9050 states. [2021-11-23 17:00:23,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9050 to 8938. [2021-11-23 17:00:23,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8938 states, 8936 states have (on average 1.330237242614145) internal successors, (11887), 8937 states have internal predecessors, (11887), 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 17:00:23,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8938 states to 8938 states and 11887 transitions. [2021-11-23 17:00:23,387 INFO L78 Accepts]: Start accepts. Automaton has 8938 states and 11887 transitions. Word has length 136 [2021-11-23 17:00:23,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:23,388 INFO L470 AbstractCegarLoop]: Abstraction has 8938 states and 11887 transitions. [2021-11-23 17:00:23,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 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 17:00:23,388 INFO L276 IsEmpty]: Start isEmpty. Operand 8938 states and 11887 transitions. [2021-11-23 17:00:23,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:00:23,392 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:23,393 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:00:23,419 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Ended with exit code 0 [2021-11-23 17:00:23,608 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:23,802 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:23,997 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:23,997 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:23,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:23,998 INFO L85 PathProgramCache]: Analyzing trace with hash 1152218216, now seen corresponding path program 1 times [2021-11-23 17:00:23,998 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:23,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [249336401] [2021-11-23 17:00:23,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:23,998 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:23,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:24,000 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:24,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Waiting until timeout for monitored process [2021-11-23 17:00:24,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:24,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:00:24,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:25,385 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 93 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 17:00:25,385 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:25,385 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:25,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [249336401] [2021-11-23 17:00:25,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [249336401] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:25,385 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:25,385 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:00:25,386 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901071177] [2021-11-23 17:00:25,386 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:25,386 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:00:25,386 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:25,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:00:25,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:00:25,387 INFO L87 Difference]: Start difference. First operand 8938 states and 11887 transitions. Second operand has 6 states, 6 states have (on average 21.333333333333332) internal successors, (128), 5 states have internal predecessors, (128), 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 17:00:26,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:26,037 INFO L93 Difference]: Finished difference Result 13498 states and 17655 transitions. [2021-11-23 17:00:26,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:00:26,038 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.333333333333332) internal successors, (128), 5 states have internal predecessors, (128), 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 136 [2021-11-23 17:00:26,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:26,050 INFO L225 Difference]: With dead ends: 13498 [2021-11-23 17:00:26,050 INFO L226 Difference]: Without dead ends: 11230 [2021-11-23 17:00:26,055 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 131 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 17:00:26,055 INFO L933 BasicCegarLoop]: 1541 mSDtfsCounter, 2963 mSDsluCounter, 1636 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2963 SdHoareTripleChecker+Valid, 3177 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 64 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:26,056 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2963 Valid, 3177 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 64 Unchecked, 0.0s Time] [2021-11-23 17:00:26,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11230 states. [2021-11-23 17:00:26,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11230 to 11112. [2021-11-23 17:00:26,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11112 states, 11110 states have (on average 1.316021602160216) internal successors, (14621), 11111 states have internal predecessors, (14621), 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 17:00:26,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11112 states to 11112 states and 14621 transitions. [2021-11-23 17:00:26,751 INFO L78 Accepts]: Start accepts. Automaton has 11112 states and 14621 transitions. Word has length 136 [2021-11-23 17:00:26,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:26,751 INFO L470 AbstractCegarLoop]: Abstraction has 11112 states and 14621 transitions. [2021-11-23 17:00:26,751 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.333333333333332) internal successors, (128), 5 states have internal predecessors, (128), 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 17:00:26,752 INFO L276 IsEmpty]: Start isEmpty. Operand 11112 states and 14621 transitions. [2021-11-23 17:00:26,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:00:26,756 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:26,756 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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, 1, 1, 1, 1] [2021-11-23 17:00:26,767 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:26,957 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:26,957 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:26,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:26,957 INFO L85 PathProgramCache]: Analyzing trace with hash 1995068051, now seen corresponding path program 1 times [2021-11-23 17:00:26,958 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:26,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1381869820] [2021-11-23 17:00:26,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:26,958 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:26,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:26,959 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:26,960 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Waiting until timeout for monitored process [2021-11-23 17:00:27,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:27,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:00:27,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:28,320 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 93 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 17:00:28,320 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:00:28,320 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:28,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1381869820] [2021-11-23 17:00:28,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1381869820] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:00:28,321 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:00:28,321 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:00:28,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636325401] [2021-11-23 17:00:28,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:00:28,322 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:00:28,322 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:28,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:00:28,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:00:28,323 INFO L87 Difference]: Start difference. First operand 11112 states and 14621 transitions. Second operand has 6 states, 6 states have (on average 20.833333333333332) internal successors, (125), 5 states have internal predecessors, (125), 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 17:00:29,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:29,263 INFO L93 Difference]: Finished difference Result 16806 states and 21913 transitions. [2021-11-23 17:00:29,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:00:29,264 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 20.833333333333332) internal successors, (125), 5 states have internal predecessors, (125), 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 136 [2021-11-23 17:00:29,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:29,284 INFO L225 Difference]: With dead ends: 16806 [2021-11-23 17:00:29,284 INFO L226 Difference]: Without dead ends: 13918 [2021-11-23 17:00:29,288 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 131 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 17:00:29,289 INFO L933 BasicCegarLoop]: 1544 mSDtfsCounter, 2969 mSDsluCounter, 3036 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2969 SdHoareTripleChecker+Valid, 4580 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 40 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:29,289 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2969 Valid, 4580 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 13 Invalid, 0 Unknown, 40 Unchecked, 0.0s Time] [2021-11-23 17:00:29,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13918 states. [2021-11-23 17:00:30,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13918 to 13864. [2021-11-23 17:00:30,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13864 states, 13862 states have (on average 1.3042129562833646) internal successors, (18079), 13863 states have internal predecessors, (18079), 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 17:00:30,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13864 states to 13864 states and 18079 transitions. [2021-11-23 17:00:30,374 INFO L78 Accepts]: Start accepts. Automaton has 13864 states and 18079 transitions. Word has length 136 [2021-11-23 17:00:30,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:30,374 INFO L470 AbstractCegarLoop]: Abstraction has 13864 states and 18079 transitions. [2021-11-23 17:00:30,375 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 20.833333333333332) internal successors, (125), 5 states have internal predecessors, (125), 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 17:00:30,375 INFO L276 IsEmpty]: Start isEmpty. Operand 13864 states and 18079 transitions. [2021-11-23 17:00:30,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:00:30,380 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:30,380 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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, 1, 1, 1, 1] [2021-11-23 17:00:30,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:30,581 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:00:30,581 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:30,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:30,581 INFO L85 PathProgramCache]: Analyzing trace with hash 1086062995, now seen corresponding path program 1 times [2021-11-23 17:00:30,582 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:30,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1841418072] [2021-11-23 17:00:30,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:30,582 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:30,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:30,583 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:30,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (106)] Waiting until timeout for monitored process [2021-11-23 17:00:30,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:30,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:00:30,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:32,925 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:00:32,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:34,033 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:00:34,033 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:34,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1841418072] [2021-11-23 17:00:34,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1841418072] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:34,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [260836858] [2021-11-23 17:00:34,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:34,034 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:34,034 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:00:34,036 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:00:34,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (107)] Waiting until timeout for monitored process [2021-11-23 17:00:34,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:34,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:34,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:36,740 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 31 proven. 54 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:00:36,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:37,779 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 31 proven. 54 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:00:37,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [260836858] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:37,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1702533245] [2021-11-23 17:00:37,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:37,780 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:37,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:37,781 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:00:37,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Waiting until timeout for monitored process [2021-11-23 17:00:37,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:37,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:00:37,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:40,040 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 31 proven. 54 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:00:40,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:40,762 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 31 proven. 54 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:00:40,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1702533245] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:40,763 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:00:40,763 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:00:40,763 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188949405] [2021-11-23 17:00:40,763 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:00:40,764 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:00:40,764 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:40,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:00:40,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:00:40,765 INFO L87 Difference]: Start difference. First operand 13864 states and 18079 transitions. Second operand has 32 states, 32 states have (on average 12.6875) internal successors, (406), 31 states have internal predecessors, (406), 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 17:00:44,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:44,478 INFO L93 Difference]: Finished difference Result 22269 states and 28662 transitions. [2021-11-23 17:00:44,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 17:00:44,479 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 12.6875) internal successors, (406), 31 states have internal predecessors, (406), 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 136 [2021-11-23 17:00:44,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:44,505 INFO L225 Difference]: With dead ends: 22269 [2021-11-23 17:00:44,505 INFO L226 Difference]: Without dead ends: 20816 [2021-11-23 17:00:44,511 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 843 GetRequests, 786 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 782 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=348, Invalid=2844, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 17:00:44,511 INFO L933 BasicCegarLoop]: 1601 mSDtfsCounter, 10307 mSDsluCounter, 27255 mSDsCounter, 0 mSdLazyCounter, 295 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10307 SdHoareTripleChecker+Valid, 28856 SdHoareTripleChecker+Invalid, 556 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 252 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:44,511 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10307 Valid, 28856 Invalid, 556 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 295 Invalid, 0 Unknown, 252 Unchecked, 0.4s Time] [2021-11-23 17:00:44,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20816 states. [2021-11-23 17:00:45,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20816 to 18753. [2021-11-23 17:00:45,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18753 states, 18751 states have (on average 1.2908111567383074) internal successors, (24204), 18752 states have internal predecessors, (24204), 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 17:00:45,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18753 states to 18753 states and 24204 transitions. [2021-11-23 17:00:45,975 INFO L78 Accepts]: Start accepts. Automaton has 18753 states and 24204 transitions. Word has length 136 [2021-11-23 17:00:45,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:45,975 INFO L470 AbstractCegarLoop]: Abstraction has 18753 states and 24204 transitions. [2021-11-23 17:00:45,975 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 12.6875) internal successors, (406), 31 states have internal predecessors, (406), 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 17:00:45,975 INFO L276 IsEmpty]: Start isEmpty. Operand 18753 states and 24204 transitions. [2021-11-23 17:00:45,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:00:45,981 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:45,981 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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, 1, 1] [2021-11-23 17:00:45,992 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (106)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:46,184 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (107)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:46,412 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:46,582 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:46,582 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:46,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:46,583 INFO L85 PathProgramCache]: Analyzing trace with hash 887812920, now seen corresponding path program 1 times [2021-11-23 17:00:46,583 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:46,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1858778482] [2021-11-23 17:00:46,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:46,584 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:46,584 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:46,585 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:46,586 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (109)] Waiting until timeout for monitored process [2021-11-23 17:00:46,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:46,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:00:46,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:49,303 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 70 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:00:49,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:50,246 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 70 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:00:50,246 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:50,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1858778482] [2021-11-23 17:00:50,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1858778482] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:50,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1115761882] [2021-11-23 17:00:50,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:50,247 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:50,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:00:50,248 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:00:50,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (110)] Waiting until timeout for monitored process [2021-11-23 17:00:50,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:50,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:00:50,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:54,348 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:54,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:55,913 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:55,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1115761882] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:55,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338428004] [2021-11-23 17:00:55,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:00:55,913 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:55,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:55,914 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:00:55,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Waiting until timeout for monitored process [2021-11-23 17:00:56,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:56,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:00:56,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:58,820 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:58,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:59,742 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:00:59,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338428004] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:59,742 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:00:59,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 13, 13] total 41 [2021-11-23 17:00:59,743 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834582969] [2021-11-23 17:00:59,743 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:00:59,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-23 17:00:59,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:59,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-23 17:00:59,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=1580, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 17:00:59,745 INFO L87 Difference]: Start difference. First operand 18753 states and 24204 transitions. Second operand has 42 states, 42 states have (on average 10.571428571428571) internal successors, (444), 41 states have internal predecessors, (444), 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 17:01:03,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:03,371 INFO L93 Difference]: Finished difference Result 20190 states and 26066 transitions. [2021-11-23 17:01:03,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 17:01:03,372 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 10.571428571428571) internal successors, (444), 41 states have internal predecessors, (444), 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 136 [2021-11-23 17:01:03,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:03,394 INFO L225 Difference]: With dead ends: 20190 [2021-11-23 17:01:03,394 INFO L226 Difference]: Without dead ends: 18646 [2021-11-23 17:01:03,400 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 835 GetRequests, 775 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 831 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=315, Invalid=3225, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 17:01:03,401 INFO L933 BasicCegarLoop]: 1537 mSDtfsCounter, 11663 mSDsluCounter, 39541 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11663 SdHoareTripleChecker+Valid, 41078 SdHoareTripleChecker+Invalid, 449 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 287 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:01:03,401 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11663 Valid, 41078 Invalid, 449 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [7 Valid, 155 Invalid, 0 Unknown, 287 Unchecked, 0.2s Time] [2021-11-23 17:01:03,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18646 states. [2021-11-23 17:01:04,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18646 to 18646. [2021-11-23 17:01:04,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18646 states, 18644 states have (on average 1.2911928770650074) internal successors, (24073), 18645 states have internal predecessors, (24073), 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 17:01:04,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18646 states to 18646 states and 24073 transitions. [2021-11-23 17:01:04,700 INFO L78 Accepts]: Start accepts. Automaton has 18646 states and 24073 transitions. Word has length 136 [2021-11-23 17:01:04,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:04,700 INFO L470 AbstractCegarLoop]: Abstraction has 18646 states and 24073 transitions. [2021-11-23 17:01:04,701 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 10.571428571428571) internal successors, (444), 41 states have internal predecessors, (444), 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 17:01:04,701 INFO L276 IsEmpty]: Start isEmpty. Operand 18646 states and 24073 transitions. [2021-11-23 17:01:04,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:01:04,707 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:04,707 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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 17:01:04,718 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (109)] Ended with exit code 0 [2021-11-23 17:01:04,909 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (110)] Ended with exit code 0 [2021-11-23 17:01:05,131 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Ended with exit code 0 [2021-11-23 17:01:05,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:01:05,308 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:05,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:05,308 INFO L85 PathProgramCache]: Analyzing trace with hash 464166198, now seen corresponding path program 1 times [2021-11-23 17:01:05,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:05,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [714684543] [2021-11-23 17:01:05,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:05,309 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:05,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:05,310 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:05,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (112)] Waiting until timeout for monitored process [2021-11-23 17:01:05,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:05,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:01:05,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:08,076 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 66 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:01:08,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:09,175 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 66 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:01:09,176 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:09,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [714684543] [2021-11-23 17:01:09,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [714684543] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:09,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [672127239] [2021-11-23 17:01:09,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:09,177 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:01:09,177 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:01:09,179 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:01:09,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (113)] Waiting until timeout for monitored process [2021-11-23 17:01:09,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:09,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:01:09,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:14,107 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:14,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:15,660 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:15,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [672127239] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:15,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1540556123] [2021-11-23 17:01:15,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:15,661 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:01:15,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:01:15,662 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:01:15,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Waiting until timeout for monitored process [2021-11-23 17:01:15,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:15,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:01:15,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:19,384 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:19,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:20,329 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:20,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1540556123] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:20,329 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:01:20,330 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 13, 13] total 39 [2021-11-23 17:01:20,330 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237189808] [2021-11-23 17:01:20,330 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:01:20,331 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-23 17:01:20,331 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:20,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-23 17:01:20,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1425, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 17:01:20,332 INFO L87 Difference]: Start difference. First operand 18646 states and 24073 transitions. Second operand has 40 states, 40 states have (on average 11.025) internal successors, (441), 39 states have internal predecessors, (441), 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 17:01:37,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:01:37,854 INFO L93 Difference]: Finished difference Result 56026 states and 71628 transitions. [2021-11-23 17:01:37,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 163 states. [2021-11-23 17:01:37,854 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 11.025) internal successors, (441), 39 states have internal predecessors, (441), 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 136 [2021-11-23 17:01:37,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:01:37,917 INFO L225 Difference]: With dead ends: 56026 [2021-11-23 17:01:37,918 INFO L226 Difference]: Without dead ends: 50348 [2021-11-23 17:01:37,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 988 GetRequests, 792 SyntacticMatches, 6 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13574 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=2419, Invalid=34253, Unknown=0, NotChecked=0, Total=36672 [2021-11-23 17:01:37,929 INFO L933 BasicCegarLoop]: 1753 mSDtfsCounter, 16550 mSDsluCounter, 36916 mSDsCounter, 0 mSdLazyCounter, 2476 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16550 SdHoareTripleChecker+Valid, 38669 SdHoareTripleChecker+Invalid, 6689 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 2476 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 4158 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:01:37,930 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16550 Valid, 38669 Invalid, 6689 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [55 Valid, 2476 Invalid, 0 Unknown, 4158 Unchecked, 3.1s Time] [2021-11-23 17:01:37,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50348 states. [2021-11-23 17:01:39,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50348 to 17587. [2021-11-23 17:01:39,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17587 states, 17585 states have (on average 1.293545635484788) internal successors, (22747), 17586 states have internal predecessors, (22747), 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 17:01:39,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17587 states to 17587 states and 22747 transitions. [2021-11-23 17:01:39,593 INFO L78 Accepts]: Start accepts. Automaton has 17587 states and 22747 transitions. Word has length 136 [2021-11-23 17:01:39,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:01:39,593 INFO L470 AbstractCegarLoop]: Abstraction has 17587 states and 22747 transitions. [2021-11-23 17:01:39,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 11.025) internal successors, (441), 39 states have internal predecessors, (441), 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 17:01:39,593 INFO L276 IsEmpty]: Start isEmpty. Operand 17587 states and 22747 transitions. [2021-11-23 17:01:39,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:01:39,597 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:01:39,598 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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, 1, 1, 1, 1] [2021-11-23 17:01:39,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (113)] Forceful destruction successful, exit code 0 [2021-11-23 17:01:39,807 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (112)] Ended with exit code 0 [2021-11-23 17:01:40,021 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Ended with exit code 0 [2021-11-23 17:01:40,198 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:01:40,199 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:01:40,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:01:40,199 INFO L85 PathProgramCache]: Analyzing trace with hash 774536218, now seen corresponding path program 1 times [2021-11-23 17:01:40,200 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:01:40,200 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [84340062] [2021-11-23 17:01:40,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:40,200 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:01:40,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:01:40,201 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:01:40,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (115)] Waiting until timeout for monitored process [2021-11-23 17:01:40,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:40,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:01:40,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:42,925 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 74 proven. 28 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:01:42,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:43,793 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 74 proven. 28 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:01:43,794 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:01:43,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [84340062] [2021-11-23 17:01:43,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [84340062] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:43,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [34072502] [2021-11-23 17:01:43,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:43,794 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:01:43,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:01:43,795 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:01:43,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (116)] Waiting until timeout for monitored process [2021-11-23 17:01:43,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:43,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:01:43,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:46,852 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:46,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:48,131 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:48,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [34072502] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:48,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1117016728] [2021-11-23 17:01:48,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:01:48,131 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:01:48,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:01:48,132 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:01:48,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Waiting until timeout for monitored process [2021-11-23 17:01:48,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:01:48,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:01:48,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:50,628 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:50,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:51,564 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:01:51,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1117016728] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:51,564 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:01:51,565 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 13, 13] total 31 [2021-11-23 17:01:51,565 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972870610] [2021-11-23 17:01:51,565 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:01:51,566 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:01:51,566 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:51,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:01:51,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:01:51,567 INFO L87 Difference]: Start difference. First operand 17587 states and 22747 transitions. Second operand has 32 states, 32 states have (on average 12.28125) internal successors, (393), 31 states have internal predecessors, (393), 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 17:02:06,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:02:06,075 INFO L93 Difference]: Finished difference Result 67826 states and 86566 transitions. [2021-11-23 17:02:06,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2021-11-23 17:02:06,075 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 12.28125) internal successors, (393), 31 states have internal predecessors, (393), 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 136 [2021-11-23 17:02:06,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:02:06,155 INFO L225 Difference]: With dead ends: 67826 [2021-11-23 17:02:06,156 INFO L226 Difference]: Without dead ends: 58781 [2021-11-23 17:02:06,172 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 938 GetRequests, 799 SyntacticMatches, 6 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6544 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=1501, Invalid=16589, Unknown=0, NotChecked=0, Total=18090 [2021-11-23 17:02:06,172 INFO L933 BasicCegarLoop]: 1694 mSDtfsCounter, 13884 mSDsluCounter, 24651 mSDsCounter, 0 mSdLazyCounter, 1319 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13884 SdHoareTripleChecker+Valid, 26345 SdHoareTripleChecker+Invalid, 3181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 1319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1787 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:02:06,173 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13884 Valid, 26345 Invalid, 3181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 1319 Invalid, 0 Unknown, 1787 Unchecked, 2.0s Time] [2021-11-23 17:02:06,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58781 states. [2021-11-23 17:02:09,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58781 to 30526. [2021-11-23 17:02:09,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30526 states, 30524 states have (on average 1.2821058838946402) internal successors, (39135), 30525 states have internal predecessors, (39135), 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 17:02:09,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30526 states to 30526 states and 39135 transitions. [2021-11-23 17:02:09,709 INFO L78 Accepts]: Start accepts. Automaton has 30526 states and 39135 transitions. Word has length 136 [2021-11-23 17:02:09,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:02:09,710 INFO L470 AbstractCegarLoop]: Abstraction has 30526 states and 39135 transitions. [2021-11-23 17:02:09,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 12.28125) internal successors, (393), 31 states have internal predecessors, (393), 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 17:02:09,710 INFO L276 IsEmpty]: Start isEmpty. Operand 30526 states and 39135 transitions. [2021-11-23 17:02:09,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-23 17:02:09,716 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:02:09,716 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 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, 1, 1, 1, 1] [2021-11-23 17:02:09,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Forceful destruction successful, exit code 0 [2021-11-23 17:02:09,918 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (116)] Ended with exit code 0 [2021-11-23 17:02:10,127 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (115)] Ended with exit code 0 [2021-11-23 17:02:10,316 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:02:10,317 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:02:10,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:02:10,317 INFO L85 PathProgramCache]: Analyzing trace with hash -134468838, now seen corresponding path program 1 times [2021-11-23 17:02:10,318 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:02:10,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [186107632] [2021-11-23 17:02:10,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:10,318 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:02:10,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:02:10,319 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:02:10,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (118)] Waiting until timeout for monitored process [2021-11-23 17:02:10,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:10,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:02:10,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:02:12,606 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:02:12,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:02:13,703 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:02:13,703 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:02:13,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [186107632] [2021-11-23 17:02:13,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [186107632] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:02:13,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1421632556] [2021-11-23 17:02:13,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:02:13,704 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:02:13,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:02:13,705 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:02:13,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a469d8e9-e0a9-4249-8f71-3861d4fe27cb/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (119)] Waiting until timeout for monitored process [2021-11-23 17:02:13,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:02:13,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:02:13,889 INFO L286 TraceCheckSpWp]: Computing forward predicates...