./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.5.1.ufo.BOUNDED-10.pals.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_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/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_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.5.1.ufo.BOUNDED-10.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/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_0f8d91e4-d880-4769-9b91-1f3010e25dba/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 2c3b1a53bc376cbb6283db57f6430d0a17b3acc99aa70ab198c7c36e6e59ecc9 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:15:05,702 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:15:05,705 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:15:05,763 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:15:05,764 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:15:05,771 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:15:05,773 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:15:05,777 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:15:05,781 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:15:05,788 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:15:05,790 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:15:05,792 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:15:05,792 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:15:05,795 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:15:05,798 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:15:05,806 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:15:05,809 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:15:05,810 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:15:05,813 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:15:05,820 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:15:05,823 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:15:05,824 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:15:05,828 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:15:05,829 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:15:05,836 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:15:05,836 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:15:05,837 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:15:05,839 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:15:05,840 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:15:05,841 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:15:05,842 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:15:05,843 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:15:05,845 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:15:05,847 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:15:05,849 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:15:05,849 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:15:05,850 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:15:05,850 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:15:05,850 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:15:05,852 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:15:05,852 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:15:05,853 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:15:05,900 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:15:05,900 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:15:05,901 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:15:05,901 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:15:05,908 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:15:05,908 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:15:05,909 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:15:05,909 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:15:05,909 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:15:05,909 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:15:05,911 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:15:05,911 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:15:05,911 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:15:05,911 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:15:05,912 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:15:05,912 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:15:05,912 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:15:05,912 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:15:05,913 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:15:05,914 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:15:05,914 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:15:05,914 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:15:05,914 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:15:05,915 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:15:05,915 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:15:05,915 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:15:05,917 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:15:05,917 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:15:05,917 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:15:05,918 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:15:05,918 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:15:05,918 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:15:05,919 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:15:05,919 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:15:05,919 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:15:05,919 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:15:05,920 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:15:05,920 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:15:05,920 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:15:05,920 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:15:05,920 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:15:05,921 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_0f8d91e4-d880-4769-9b91-1f3010e25dba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2c3b1a53bc376cbb6283db57f6430d0a17b3acc99aa70ab198c7c36e6e59ecc9 [2021-11-23 17:15:06,236 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:15:06,268 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:15:06,270 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:15:06,271 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:15:06,272 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:15:06,274 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.5.1.ufo.BOUNDED-10.pals.c [2021-11-23 17:15:06,344 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/data/c752c2fb5/2c259dd3f28f4ab097063b9472dc6e53/FLAG784c19edc [2021-11-23 17:15:06,966 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:15:06,967 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/sv-benchmarks/c/seq-mthreaded/pals_lcr.5.1.ufo.BOUNDED-10.pals.c [2021-11-23 17:15:06,986 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/data/c752c2fb5/2c259dd3f28f4ab097063b9472dc6e53/FLAG784c19edc [2021-11-23 17:15:07,248 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/data/c752c2fb5/2c259dd3f28f4ab097063b9472dc6e53 [2021-11-23 17:15:07,256 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:15:07,259 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:15:07,262 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:15:07,263 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:15:07,267 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:15:07,268 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:15:07" (1/1) ... [2021-11-23 17:15:07,271 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@60989908 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:07, skipping insertion in model container [2021-11-23 17:15:07,272 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:15:07" (1/1) ... [2021-11-23 17:15:07,281 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:15:07,357 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:15:07,713 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_0f8d91e4-d880-4769-9b91-1f3010e25dba/sv-benchmarks/c/seq-mthreaded/pals_lcr.5.1.ufo.BOUNDED-10.pals.c[11270,11283] [2021-11-23 17:15:07,717 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:15:07,744 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:15:07,855 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_0f8d91e4-d880-4769-9b91-1f3010e25dba/sv-benchmarks/c/seq-mthreaded/pals_lcr.5.1.ufo.BOUNDED-10.pals.c[11270,11283] [2021-11-23 17:15:07,860 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:15:07,886 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:15:07,887 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:07 WrapperNode [2021-11-23 17:15:07,887 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:15:07,889 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:15:07,889 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:15:07,889 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:15:07,898 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:07" (1/1) ... [2021-11-23 17:15:07,927 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:07" (1/1) ... [2021-11-23 17:15:07,988 INFO L137 Inliner]: procedures = 24, calls = 16, calls flagged for inlining = 11, calls inlined = 11, statements flattened = 334 [2021-11-23 17:15:07,991 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:15:07,992 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:15:07,993 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:15:07,993 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:15:08,004 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:07" (1/1) ... [2021-11-23 17:15:08,005 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:07" (1/1) ... [2021-11-23 17:15:08,023 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:07" (1/1) ... [2021-11-23 17:15:08,025 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:07" (1/1) ... [2021-11-23 17:15:08,034 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:07" (1/1) ... [2021-11-23 17:15:08,057 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:07" (1/1) ... [2021-11-23 17:15:08,068 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:07" (1/1) ... [2021-11-23 17:15:08,072 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:15:08,075 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:15:08,076 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:15:08,082 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:15:08,083 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:07" (1/1) ... [2021-11-23 17:15:08,093 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:15:08,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:15:08,131 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:15:08,165 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:15:08,193 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:15:08,194 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:15:08,194 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:15:08,194 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:15:08,339 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:15:08,341 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:15:08,857 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:15:08,909 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 17:15:08,913 INFO L158 Benchmark]: Toolchain (without parser) took 1652.79ms. Allocated memory was 86.0MB in the beginning and 119.5MB in the end (delta: 33.6MB). Free memory was 48.1MB in the beginning and 62.1MB in the end (delta: -14.0MB). Peak memory consumption was 16.4MB. Max. memory is 16.1GB. [2021-11-23 17:15:08,914 INFO L158 Benchmark]: CDTParser took 0.32ms. Allocated memory is still 86.0MB. Free memory was 64.9MB in the beginning and 64.9MB in the end (delta: 46.1kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:15:08,915 INFO L158 Benchmark]: CACSL2BoogieTranslator took 625.11ms. Allocated memory was 86.0MB in the beginning and 119.5MB in the end (delta: 33.6MB). Free memory was 47.9MB in the beginning and 91.5MB in the end (delta: -43.6MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-11-23 17:15:08,916 INFO L158 Benchmark]: Boogie Procedure Inliner took 103.06ms. Allocated memory is still 119.5MB. Free memory was 91.5MB in the beginning and 88.6MB in the end (delta: 2.9MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-11-23 17:15:08,916 INFO L158 Benchmark]: Boogie Preprocessor took 82.04ms. Allocated memory is still 119.5MB. Free memory was 88.6MB in the beginning and 86.9MB in the end (delta: 1.7MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:15:08,917 INFO L158 Benchmark]: RCFGBuilder took 835.80ms. Allocated memory is still 119.5MB. Free memory was 86.9MB in the beginning and 62.1MB in the end (delta: 24.8MB). Peak memory consumption was 25.2MB. Max. memory is 16.1GB. [2021-11-23 17:15:08,920 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32ms. Allocated memory is still 86.0MB. Free memory was 64.9MB in the beginning and 64.9MB in the end (delta: 46.1kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 625.11ms. Allocated memory was 86.0MB in the beginning and 119.5MB in the end (delta: 33.6MB). Free memory was 47.9MB in the beginning and 91.5MB in the end (delta: -43.6MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 103.06ms. Allocated memory is still 119.5MB. Free memory was 91.5MB in the beginning and 88.6MB in the end (delta: 2.9MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Boogie Preprocessor took 82.04ms. Allocated memory is still 119.5MB. Free memory was 88.6MB in the beginning and 86.9MB in the end (delta: 1.7MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 835.80ms. Allocated memory is still 119.5MB. Free memory was 86.9MB in the beginning and 62.1MB in the end (delta: 24.8MB). Peak memory consumption was 25.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 17:15:08,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/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_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/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_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.5.1.ufo.BOUNDED-10.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/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_0f8d91e4-d880-4769-9b91-1f3010e25dba/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 2c3b1a53bc376cbb6283db57f6430d0a17b3acc99aa70ab198c7c36e6e59ecc9 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:15:11,583 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:15:11,587 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:15:11,641 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:15:11,642 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:15:11,648 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:15:11,650 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:15:11,659 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:15:11,662 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:15:11,673 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:15:11,675 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:15:11,676 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:15:11,677 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:15:11,680 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:15:11,681 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:15:11,683 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:15:11,688 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:15:11,690 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:15:11,692 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:15:11,694 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:15:11,698 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:15:11,700 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:15:11,702 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:15:11,705 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:15:11,712 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:15:11,714 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:15:11,715 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:15:11,717 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:15:11,718 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:15:11,719 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:15:11,720 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:15:11,720 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:15:11,722 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:15:11,723 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:15:11,725 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:15:11,725 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:15:11,726 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:15:11,726 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:15:11,726 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:15:11,728 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:15:11,729 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:15:11,734 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:15:11,782 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:15:11,782 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:15:11,783 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:15:11,783 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:15:11,784 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:15:11,784 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:15:11,784 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:15:11,785 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:15:11,785 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:15:11,785 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:15:11,786 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:15:11,786 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:15:11,788 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:15:11,788 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:15:11,789 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:15:11,789 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:15:11,789 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:15:11,789 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:15:11,790 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:15:11,790 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:15:11,790 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:15:11,790 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:15:11,790 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:15:11,791 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:15:11,791 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:15:11,791 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:15:11,791 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:15:11,792 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:15:11,792 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:15:11,792 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:15:11,792 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:15:11,792 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:15:11,793 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:15:11,793 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:15:11,793 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:11,794 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:15:11,794 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:15:11,794 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:15:11,794 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_0f8d91e4-d880-4769-9b91-1f3010e25dba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2c3b1a53bc376cbb6283db57f6430d0a17b3acc99aa70ab198c7c36e6e59ecc9 [2021-11-23 17:15:12,136 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:15:12,162 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:15:12,165 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:15:12,166 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:15:12,167 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:15:12,169 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.5.1.ufo.BOUNDED-10.pals.c [2021-11-23 17:15:12,235 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/data/0f647a164/46d89532fbd74c2691f0a4ea1cf08f38/FLAG8c67feeaf [2021-11-23 17:15:12,799 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:15:12,800 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/sv-benchmarks/c/seq-mthreaded/pals_lcr.5.1.ufo.BOUNDED-10.pals.c [2021-11-23 17:15:12,813 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/data/0f647a164/46d89532fbd74c2691f0a4ea1cf08f38/FLAG8c67feeaf [2021-11-23 17:15:13,102 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/data/0f647a164/46d89532fbd74c2691f0a4ea1cf08f38 [2021-11-23 17:15:13,105 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:15:13,107 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:15:13,109 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:15:13,110 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:15:13,114 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:15:13,116 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:15:13" (1/1) ... [2021-11-23 17:15:13,118 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7f2590d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:13, skipping insertion in model container [2021-11-23 17:15:13,118 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:15:13" (1/1) ... [2021-11-23 17:15:13,128 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:15:13,189 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:15:13,485 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_0f8d91e4-d880-4769-9b91-1f3010e25dba/sv-benchmarks/c/seq-mthreaded/pals_lcr.5.1.ufo.BOUNDED-10.pals.c[11270,11283] [2021-11-23 17:15:13,488 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:15:13,501 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:15:13,586 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_0f8d91e4-d880-4769-9b91-1f3010e25dba/sv-benchmarks/c/seq-mthreaded/pals_lcr.5.1.ufo.BOUNDED-10.pals.c[11270,11283] [2021-11-23 17:15:13,588 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:15:13,607 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:15:13,607 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:13 WrapperNode [2021-11-23 17:15:13,608 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:15:13,609 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:15:13,609 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:15:13,609 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:15:13,617 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:13" (1/1) ... [2021-11-23 17:15:13,647 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:13" (1/1) ... [2021-11-23 17:15:13,683 INFO L137 Inliner]: procedures = 24, calls = 16, calls flagged for inlining = 11, calls inlined = 11, statements flattened = 316 [2021-11-23 17:15:13,683 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:15:13,684 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:15:13,684 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:15:13,685 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:15:13,694 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:13" (1/1) ... [2021-11-23 17:15:13,694 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:13" (1/1) ... [2021-11-23 17:15:13,699 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:13" (1/1) ... [2021-11-23 17:15:13,699 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:13" (1/1) ... [2021-11-23 17:15:13,711 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:13" (1/1) ... [2021-11-23 17:15:13,718 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:13" (1/1) ... [2021-11-23 17:15:13,722 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:13" (1/1) ... [2021-11-23 17:15:13,726 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:15:13,727 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:15:13,728 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:15:13,728 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:15:13,728 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:13" (1/1) ... [2021-11-23 17:15:13,735 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:15:13,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:15:13,762 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:15:13,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:15:13,825 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:15:13,825 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:15:13,826 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:15:13,826 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:15:13,962 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:15:13,964 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:15:14,577 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:15:14,585 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:15:14,585 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 17:15:14,592 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:15:14 BoogieIcfgContainer [2021-11-23 17:15:14,592 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:15:14,594 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:15:14,594 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:15:14,597 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:15:14,597 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:15:13" (1/3) ... [2021-11-23 17:15:14,598 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40097c35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:15:14, skipping insertion in model container [2021-11-23 17:15:14,598 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:15:13" (2/3) ... [2021-11-23 17:15:14,598 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40097c35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:15:14, skipping insertion in model container [2021-11-23 17:15:14,599 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:15:14" (3/3) ... [2021-11-23 17:15:14,600 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.5.1.ufo.BOUNDED-10.pals.c [2021-11-23 17:15:14,605 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:15:14,606 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:15:14,668 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:15:14,675 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 17:15:14,676 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:15:14,693 INFO L276 IsEmpty]: Start isEmpty. Operand has 93 states, 91 states have (on average 1.7252747252747254) internal successors, (157), 92 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:14,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 17:15:14,701 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:14,701 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] [2021-11-23 17:15:14,702 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:14,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:14,708 INFO L85 PathProgramCache]: Analyzing trace with hash 8392247, now seen corresponding path program 1 times [2021-11-23 17:15:14,721 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:14,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [228448285] [2021-11-23 17:15:14,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:14,723 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:14,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:14,726 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:14,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:15:14,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:14,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 17:15:14,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:15,018 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:15,019 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:15,020 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:15,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [228448285] [2021-11-23 17:15:15,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [228448285] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:15,021 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:15,021 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:15:15,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92538967] [2021-11-23 17:15:15,024 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:15,028 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 17:15:15,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:15,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 17:15:15,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:15:15,068 INFO L87 Difference]: Start difference. First operand has 93 states, 91 states have (on average 1.7252747252747254) internal successors, (157), 92 states have internal predecessors, (157), 0 states have call successors, (0), 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 16.5) internal successors, (33), 2 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:15,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:15,121 INFO L93 Difference]: Finished difference Result 150 states and 246 transitions. [2021-11-23 17:15:15,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 17:15:15,124 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 16.5) internal successors, (33), 2 states have internal predecessors, (33), 0 states have call successors, (0), 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 33 [2021-11-23 17:15:15,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:15,138 INFO L225 Difference]: With dead ends: 150 [2021-11-23 17:15:15,138 INFO L226 Difference]: Without dead ends: 89 [2021-11-23 17:15:15,142 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 32 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 17:15:15,148 INFO L933 BasicCegarLoop]: 154 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, 154 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 17:15:15,150 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:15:15,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-23 17:15:15,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-11-23 17:15:15,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.7045454545454546) internal successors, (150), 88 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:15,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 150 transitions. [2021-11-23 17:15:15,229 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 150 transitions. Word has length 33 [2021-11-23 17:15:15,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:15,230 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 150 transitions. [2021-11-23 17:15:15,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 16.5) internal successors, (33), 2 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:15,231 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 150 transitions. [2021-11-23 17:15:15,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 17:15:15,237 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:15,238 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] [2021-11-23 17:15:15,253 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:15,438 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:15,439 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:15,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:15,440 INFO L85 PathProgramCache]: Analyzing trace with hash -501080843, now seen corresponding path program 1 times [2021-11-23 17:15:15,441 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:15,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1315279063] [2021-11-23 17:15:15,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:15,442 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:15,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:15,443 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:15,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:15:15,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:15,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:15:15,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:15,689 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:15,689 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:15,690 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:15,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1315279063] [2021-11-23 17:15:15,690 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1315279063] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:15,691 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:15,691 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:15:15,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88414417] [2021-11-23 17:15:15,697 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:15,698 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:15:15,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:15,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:15:15,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:15:15,700 INFO L87 Difference]: Start difference. First operand 89 states and 150 transitions. Second operand has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:15,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:15,810 INFO L93 Difference]: Finished difference Result 145 states and 236 transitions. [2021-11-23 17:15:15,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:15:15,811 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 0 states have call successors, (0), 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 33 [2021-11-23 17:15:15,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:15,813 INFO L225 Difference]: With dead ends: 145 [2021-11-23 17:15:15,813 INFO L226 Difference]: Without dead ends: 89 [2021-11-23 17:15:15,814 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:15:15,815 INFO L933 BasicCegarLoop]: 148 mSDtfsCounter, 3 mSDsluCounter, 410 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 558 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:15,816 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 558 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:15:15,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-23 17:15:15,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-11-23 17:15:15,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.3522727272727273) internal successors, (119), 88 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:15,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 119 transitions. [2021-11-23 17:15:15,830 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 119 transitions. Word has length 33 [2021-11-23 17:15:15,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:15,831 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 119 transitions. [2021-11-23 17:15:15,831 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:15,832 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 119 transitions. [2021-11-23 17:15:15,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:15:15,835 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:15,835 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, 1, 1] [2021-11-23 17:15:15,857 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:16,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:16,046 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:16,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:16,047 INFO L85 PathProgramCache]: Analyzing trace with hash 988628396, now seen corresponding path program 1 times [2021-11-23 17:15:16,048 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:16,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1628422075] [2021-11-23 17:15:16,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:16,048 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:16,049 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:16,050 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:16,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:15:16,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:16,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:15:16,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:16,402 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:16,402 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:16,403 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:16,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1628422075] [2021-11-23 17:15:16,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1628422075] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:16,407 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:16,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:15:16,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118654378] [2021-11-23 17:15:16,408 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:16,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:15:16,412 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:16,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:15:16,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:16,414 INFO L87 Difference]: Start difference. First operand 89 states and 119 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:16,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:16,452 INFO L93 Difference]: Finished difference Result 187 states and 273 transitions. [2021-11-23 17:15:16,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:16,454 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 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 63 [2021-11-23 17:15:16,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:16,461 INFO L225 Difference]: With dead ends: 187 [2021-11-23 17:15:16,461 INFO L226 Difference]: Without dead ends: 135 [2021-11-23 17:15:16,462 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:16,466 INFO L933 BasicCegarLoop]: 187 mSDtfsCounter, 72 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:16,468 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 267 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:15:16,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-23 17:15:16,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 133. [2021-11-23 17:15:16,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.4318181818181819) internal successors, (189), 132 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:16,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 189 transitions. [2021-11-23 17:15:16,496 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 189 transitions. Word has length 63 [2021-11-23 17:15:16,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:16,496 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 189 transitions. [2021-11-23 17:15:16,497 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:16,501 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 189 transitions. [2021-11-23 17:15:16,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:15:16,506 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:16,506 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, 1, 1] [2021-11-23 17:15:16,525 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:16,721 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:16,721 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:16,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:16,722 INFO L85 PathProgramCache]: Analyzing trace with hash 243045666, now seen corresponding path program 1 times [2021-11-23 17:15:16,722 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:16,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [131176903] [2021-11-23 17:15:16,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:16,723 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:16,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:16,724 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:16,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:15:16,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:16,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:15:16,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:17,038 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:17,039 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:17,039 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:17,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [131176903] [2021-11-23 17:15:17,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [131176903] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:17,039 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:17,040 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:15:17,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124873152] [2021-11-23 17:15:17,040 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:17,040 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:15:17,041 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:17,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:15:17,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:17,041 INFO L87 Difference]: Start difference. First operand 133 states and 189 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:17,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:17,078 INFO L93 Difference]: Finished difference Result 313 states and 473 transitions. [2021-11-23 17:15:17,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:17,079 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 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 63 [2021-11-23 17:15:17,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:17,086 INFO L225 Difference]: With dead ends: 313 [2021-11-23 17:15:17,087 INFO L226 Difference]: Without dead ends: 217 [2021-11-23 17:15:17,087 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:17,088 INFO L933 BasicCegarLoop]: 182 mSDtfsCounter, 68 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:17,089 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 266 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:15:17,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-11-23 17:15:17,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 215. [2021-11-23 17:15:17,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 1.485981308411215) internal successors, (318), 214 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:17,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 318 transitions. [2021-11-23 17:15:17,120 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 318 transitions. Word has length 63 [2021-11-23 17:15:17,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:17,121 INFO L470 AbstractCegarLoop]: Abstraction has 215 states and 318 transitions. [2021-11-23 17:15:17,121 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:17,121 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 318 transitions. [2021-11-23 17:15:17,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:15:17,128 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:17,128 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, 1, 1] [2021-11-23 17:15:17,141 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:17,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:17,329 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:17,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:17,330 INFO L85 PathProgramCache]: Analyzing trace with hash -1696985192, now seen corresponding path program 1 times [2021-11-23 17:15:17,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:17,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [699208999] [2021-11-23 17:15:17,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:17,331 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:17,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:17,332 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:17,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:15:17,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:17,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:15:17,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:17,589 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:17,589 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:17,590 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:17,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [699208999] [2021-11-23 17:15:17,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [699208999] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:17,590 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:17,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:15:17,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052830501] [2021-11-23 17:15:17,591 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:17,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:15:17,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:17,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:15:17,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:17,592 INFO L87 Difference]: Start difference. First operand 215 states and 318 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:17,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:17,621 INFO L93 Difference]: Finished difference Result 547 states and 840 transitions. [2021-11-23 17:15:17,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:17,622 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 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 63 [2021-11-23 17:15:17,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:17,625 INFO L225 Difference]: With dead ends: 547 [2021-11-23 17:15:17,625 INFO L226 Difference]: Without dead ends: 369 [2021-11-23 17:15:17,626 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:17,627 INFO L933 BasicCegarLoop]: 177 mSDtfsCounter, 64 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:17,628 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 265 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:15:17,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2021-11-23 17:15:17,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 367. [2021-11-23 17:15:17,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 366 states have (on average 1.5136612021857923) internal successors, (554), 366 states have internal predecessors, (554), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:17,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 554 transitions. [2021-11-23 17:15:17,653 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 554 transitions. Word has length 63 [2021-11-23 17:15:17,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:17,654 INFO L470 AbstractCegarLoop]: Abstraction has 367 states and 554 transitions. [2021-11-23 17:15:17,654 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:17,654 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 554 transitions. [2021-11-23 17:15:17,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:15:17,655 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:17,655 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, 1, 1] [2021-11-23 17:15:17,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:17,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:17,870 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:17,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:17,870 INFO L85 PathProgramCache]: Analyzing trace with hash 1003697422, now seen corresponding path program 1 times [2021-11-23 17:15:17,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:17,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1372229367] [2021-11-23 17:15:17,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:17,872 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:17,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:17,873 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:17,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:15:18,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:18,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:15:18,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:18,252 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:18,252 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:18,253 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:18,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1372229367] [2021-11-23 17:15:18,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1372229367] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:18,253 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:18,253 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:15:18,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107457986] [2021-11-23 17:15:18,254 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:18,256 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:15:18,256 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:18,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:15:18,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:18,257 INFO L87 Difference]: Start difference. First operand 367 states and 554 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:18,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:18,298 INFO L93 Difference]: Finished difference Result 979 states and 1508 transitions. [2021-11-23 17:15:18,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:18,298 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 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 63 [2021-11-23 17:15:18,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:18,303 INFO L225 Difference]: With dead ends: 979 [2021-11-23 17:15:18,304 INFO L226 Difference]: Without dead ends: 649 [2021-11-23 17:15:18,305 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:18,310 INFO L933 BasicCegarLoop]: 172 mSDtfsCounter, 60 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 264 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:18,311 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 264 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:15:18,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 649 states. [2021-11-23 17:15:18,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 649 to 647. [2021-11-23 17:15:18,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 647 states, 646 states have (on average 1.520123839009288) internal successors, (982), 646 states have internal predecessors, (982), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:18,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 647 states to 647 states and 982 transitions. [2021-11-23 17:15:18,355 INFO L78 Accepts]: Start accepts. Automaton has 647 states and 982 transitions. Word has length 63 [2021-11-23 17:15:18,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:18,355 INFO L470 AbstractCegarLoop]: Abstraction has 647 states and 982 transitions. [2021-11-23 17:15:18,355 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:18,356 INFO L276 IsEmpty]: Start isEmpty. Operand 647 states and 982 transitions. [2021-11-23 17:15:18,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:15:18,356 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:18,357 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, 1, 1] [2021-11-23 17:15:18,374 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:18,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:18,572 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:18,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:18,573 INFO L85 PathProgramCache]: Analyzing trace with hash 1341490564, now seen corresponding path program 1 times [2021-11-23 17:15:18,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:18,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1781818426] [2021-11-23 17:15:18,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:18,578 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:18,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:18,579 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:18,581 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:15:18,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:18,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:15:18,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:18,823 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:18,823 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:18,823 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:18,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1781818426] [2021-11-23 17:15:18,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1781818426] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:18,824 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:18,824 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:15:18,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008723217] [2021-11-23 17:15:18,824 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:18,825 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:15:18,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:18,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:15:18,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:18,826 INFO L87 Difference]: Start difference. First operand 647 states and 982 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:18,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:18,887 INFO L93 Difference]: Finished difference Result 1771 states and 2712 transitions. [2021-11-23 17:15:18,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:18,887 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 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 63 [2021-11-23 17:15:18,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:18,899 INFO L225 Difference]: With dead ends: 1771 [2021-11-23 17:15:18,901 INFO L226 Difference]: Without dead ends: 1161 [2021-11-23 17:15:18,902 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:18,904 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 56 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:18,904 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 263 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:15:18,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1161 states. [2021-11-23 17:15:18,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1161 to 1159. [2021-11-23 17:15:18,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1159 states, 1158 states have (on average 1.5112262521588946) internal successors, (1750), 1158 states have internal predecessors, (1750), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:18,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1159 states to 1159 states and 1750 transitions. [2021-11-23 17:15:18,967 INFO L78 Accepts]: Start accepts. Automaton has 1159 states and 1750 transitions. Word has length 63 [2021-11-23 17:15:18,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:18,967 INFO L470 AbstractCegarLoop]: Abstraction has 1159 states and 1750 transitions. [2021-11-23 17:15:18,968 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:18,968 INFO L276 IsEmpty]: Start isEmpty. Operand 1159 states and 1750 transitions. [2021-11-23 17:15:18,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:15:18,969 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:18,969 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, 1, 1] [2021-11-23 17:15:18,983 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:19,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:19,180 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:19,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:19,181 INFO L85 PathProgramCache]: Analyzing trace with hash -1735491334, now seen corresponding path program 1 times [2021-11-23 17:15:19,182 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:19,182 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [665466967] [2021-11-23 17:15:19,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:19,182 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:19,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:19,183 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:19,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:15:19,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:19,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:15:19,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:20,273 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 17:15:20,273 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:20,274 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:20,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [665466967] [2021-11-23 17:15:20,274 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [665466967] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:20,274 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:20,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:15:20,275 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142559909] [2021-11-23 17:15:20,275 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:20,276 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:15:20,276 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:20,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:15:20,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:15:20,277 INFO L87 Difference]: Start difference. First operand 1159 states and 1750 transitions. Second operand has 7 states, 7 states have (on average 9.0) internal successors, (63), 7 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:20,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:20,829 INFO L93 Difference]: Finished difference Result 7891 states and 12028 transitions. [2021-11-23 17:15:20,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:15:20,831 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 9.0) internal successors, (63), 7 states have internal predecessors, (63), 0 states have call successors, (0), 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 63 [2021-11-23 17:15:20,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:20,884 INFO L225 Difference]: With dead ends: 7891 [2021-11-23 17:15:20,885 INFO L226 Difference]: Without dead ends: 6769 [2021-11-23 17:15:20,888 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:15:20,889 INFO L933 BasicCegarLoop]: 113 mSDtfsCounter, 743 mSDsluCounter, 453 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 743 SdHoareTripleChecker+Valid, 566 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:20,890 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [743 Valid, 566 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 17:15:20,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6769 states. [2021-11-23 17:15:21,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6769 to 3399. [2021-11-23 17:15:21,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3399 states, 3398 states have (on average 1.494408475573867) internal successors, (5078), 3398 states have internal predecessors, (5078), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:21,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3399 states to 3399 states and 5078 transitions. [2021-11-23 17:15:21,224 INFO L78 Accepts]: Start accepts. Automaton has 3399 states and 5078 transitions. Word has length 63 [2021-11-23 17:15:21,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:21,225 INFO L470 AbstractCegarLoop]: Abstraction has 3399 states and 5078 transitions. [2021-11-23 17:15:21,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 9.0) internal successors, (63), 7 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:21,226 INFO L276 IsEmpty]: Start isEmpty. Operand 3399 states and 5078 transitions. [2021-11-23 17:15:21,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 17:15:21,227 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:21,227 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, 1, 1, 1, 1] [2021-11-23 17:15:21,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:21,439 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:21,439 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:21,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:21,440 INFO L85 PathProgramCache]: Analyzing trace with hash 1519410410, now seen corresponding path program 1 times [2021-11-23 17:15:21,441 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:21,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [155318833] [2021-11-23 17:15:21,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:21,441 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:21,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:21,442 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:21,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:15:21,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:21,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:15:21,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:21,708 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:21,708 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:21,708 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:21,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [155318833] [2021-11-23 17:15:21,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [155318833] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:21,708 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:21,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:15:21,709 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170230107] [2021-11-23 17:15:21,709 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:21,709 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:15:21,709 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:21,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:15:21,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:21,710 INFO L87 Difference]: Start difference. First operand 3399 states and 5078 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:21,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:21,972 INFO L93 Difference]: Finished difference Result 8333 states and 12458 transitions. [2021-11-23 17:15:21,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:21,973 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 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 65 [2021-11-23 17:15:21,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:22,001 INFO L225 Difference]: With dead ends: 8333 [2021-11-23 17:15:22,001 INFO L226 Difference]: Without dead ends: 4971 [2021-11-23 17:15:22,006 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:22,008 INFO L933 BasicCegarLoop]: 150 mSDtfsCounter, 48 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 227 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 17:15:22,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 227 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:15:22,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4971 states. [2021-11-23 17:15:22,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4971 to 4969. [2021-11-23 17:15:22,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4969 states, 4968 states have (on average 1.4766505636070852) internal successors, (7336), 4968 states have internal predecessors, (7336), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:22,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4969 states to 4969 states and 7336 transitions. [2021-11-23 17:15:22,317 INFO L78 Accepts]: Start accepts. Automaton has 4969 states and 7336 transitions. Word has length 65 [2021-11-23 17:15:22,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:22,317 INFO L470 AbstractCegarLoop]: Abstraction has 4969 states and 7336 transitions. [2021-11-23 17:15:22,317 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:22,318 INFO L276 IsEmpty]: Start isEmpty. Operand 4969 states and 7336 transitions. [2021-11-23 17:15:22,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 17:15:22,318 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:22,318 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, 1, 1, 1, 1, 1] [2021-11-23 17:15:22,333 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:22,529 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:22,530 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:22,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:22,530 INFO L85 PathProgramCache]: Analyzing trace with hash 1503658279, now seen corresponding path program 1 times [2021-11-23 17:15:22,530 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:22,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2059229464] [2021-11-23 17:15:22,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:22,531 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:22,531 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:22,532 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:22,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:15:22,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:22,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:15:22,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:22,750 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:22,751 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:22,751 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:22,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2059229464] [2021-11-23 17:15:22,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2059229464] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:22,753 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:22,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:15:22,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106328820] [2021-11-23 17:15:22,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:22,754 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:15:22,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:22,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:15:22,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:15:22,755 INFO L87 Difference]: Start difference. First operand 4969 states and 7336 transitions. Second operand has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:23,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:23,420 INFO L93 Difference]: Finished difference Result 9433 states and 13740 transitions. [2021-11-23 17:15:23,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:15:23,421 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 0 states have call successors, (0), 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 66 [2021-11-23 17:15:23,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:23,487 INFO L225 Difference]: With dead ends: 9433 [2021-11-23 17:15:23,488 INFO L226 Difference]: Without dead ends: 9431 [2021-11-23 17:15:23,492 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:15:23,493 INFO L933 BasicCegarLoop]: 146 mSDtfsCounter, 217 mSDsluCounter, 350 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:23,494 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [217 Valid, 496 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:15:23,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9431 states. [2021-11-23 17:15:23,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9431 to 5305. [2021-11-23 17:15:23,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5305 states, 5304 states have (on average 1.4434389140271493) internal successors, (7656), 5304 states have internal predecessors, (7656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:24,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5305 states to 5305 states and 7656 transitions. [2021-11-23 17:15:24,023 INFO L78 Accepts]: Start accepts. Automaton has 5305 states and 7656 transitions. Word has length 66 [2021-11-23 17:15:24,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:24,023 INFO L470 AbstractCegarLoop]: Abstraction has 5305 states and 7656 transitions. [2021-11-23 17:15:24,023 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:24,024 INFO L276 IsEmpty]: Start isEmpty. Operand 5305 states and 7656 transitions. [2021-11-23 17:15:24,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:15:24,028 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:24,028 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:24,045 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:24,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:24,241 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:24,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:24,241 INFO L85 PathProgramCache]: Analyzing trace with hash 550206538, now seen corresponding path program 1 times [2021-11-23 17:15:24,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:24,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [509911398] [2021-11-23 17:15:24,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:24,242 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:24,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:24,244 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:24,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 17:15:24,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:24,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:24,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:25,631 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:25,632 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:26,480 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:26,480 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:26,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [509911398] [2021-11-23 17:15:26,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [509911398] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:26,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [660020249] [2021-11-23 17:15:26,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:26,481 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:26,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:26,487 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:26,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-23 17:15:26,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:26,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:26,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:27,406 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:27,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:28,105 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:28,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [660020249] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:28,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1682654253] [2021-11-23 17:15:28,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:28,107 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:15:28,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:15:28,109 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:15:28,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 17:15:28,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:28,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:28,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:29,018 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:29,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:29,686 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:29,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1682654253] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:29,686 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:15:29,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:15:29,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241194437] [2021-11-23 17:15:29,687 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:15:29,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:15:29,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:29,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:15:29,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:15:29,690 INFO L87 Difference]: Start difference. First operand 5305 states and 7656 transitions. Second operand has 16 states, 16 states have (on average 10.1875) internal successors, (163), 15 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:30,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:30,124 INFO L93 Difference]: Finished difference Result 8986 states and 13024 transitions. [2021-11-23 17:15:30,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:15:30,125 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.1875) internal successors, (163), 15 states have internal predecessors, (163), 0 states have call successors, (0), 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 94 [2021-11-23 17:15:30,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:30,147 INFO L225 Difference]: With dead ends: 8986 [2021-11-23 17:15:30,148 INFO L226 Difference]: Without dead ends: 5336 [2021-11-23 17:15:30,154 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 562 GetRequests, 544 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:15:30,155 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 122 mSDsluCounter, 689 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 787 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:30,156 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 787 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 76 Invalid, 0 Unknown, 92 Unchecked, 0.1s Time] [2021-11-23 17:15:30,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5336 states. [2021-11-23 17:15:30,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5336 to 5335. [2021-11-23 17:15:30,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5335 states, 5334 states have (on average 1.4420697412823398) internal successors, (7692), 5334 states have internal predecessors, (7692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:30,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5335 states to 5335 states and 7692 transitions. [2021-11-23 17:15:30,549 INFO L78 Accepts]: Start accepts. Automaton has 5335 states and 7692 transitions. Word has length 94 [2021-11-23 17:15:30,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:30,550 INFO L470 AbstractCegarLoop]: Abstraction has 5335 states and 7692 transitions. [2021-11-23 17:15:30,550 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.1875) internal successors, (163), 15 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:30,550 INFO L276 IsEmpty]: Start isEmpty. Operand 5335 states and 7692 transitions. [2021-11-23 17:15:30,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:15:30,554 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:30,555 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:30,598 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:30,787 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:30,978 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Ended with exit code 0 [2021-11-23 17:15:31,169 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:31,170 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:31,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:31,170 INFO L85 PathProgramCache]: Analyzing trace with hash 1551576266, now seen corresponding path program 1 times [2021-11-23 17:15:31,171 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:31,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [360014573] [2021-11-23 17:15:31,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:31,171 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:31,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:31,174 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:31,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 17:15:31,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:31,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:31,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:32,756 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:32,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:33,142 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:33,142 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:33,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [360014573] [2021-11-23 17:15:33,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [360014573] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:33,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [934225727] [2021-11-23 17:15:33,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:33,143 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:33,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:33,145 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:33,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 17:15:33,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:33,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:33,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:34,641 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:34,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:34,971 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:34,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [934225727] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:34,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [894557105] [2021-11-23 17:15:34,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:34,972 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:15:34,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:15:34,973 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:15:34,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 17:15:35,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:35,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:35,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:36,320 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:36,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:36,590 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:36,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [894557105] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:36,590 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:15:36,591 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:15:36,591 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637119034] [2021-11-23 17:15:36,591 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:15:36,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:15:36,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:36,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:15:36,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:15:36,593 INFO L87 Difference]: Start difference. First operand 5335 states and 7692 transitions. Second operand has 16 states, 16 states have (on average 10.5625) internal successors, (169), 15 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:37,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:37,046 INFO L93 Difference]: Finished difference Result 9142 states and 13187 transitions. [2021-11-23 17:15:37,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:15:37,047 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.5625) internal successors, (169), 15 states have internal predecessors, (169), 0 states have call successors, (0), 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 94 [2021-11-23 17:15:37,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:37,063 INFO L225 Difference]: With dead ends: 9142 [2021-11-23 17:15:37,064 INFO L226 Difference]: Without dead ends: 5492 [2021-11-23 17:15:37,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 562 GetRequests, 544 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:15:37,072 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 123 mSDsluCounter, 736 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 833 SdHoareTripleChecker+Invalid, 238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 125 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:37,073 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 833 Invalid, 238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 108 Invalid, 0 Unknown, 125 Unchecked, 0.1s Time] [2021-11-23 17:15:37,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5492 states. [2021-11-23 17:15:37,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5492 to 5345. [2021-11-23 17:15:37,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5345 states, 5344 states have (on average 1.4419910179640718) internal successors, (7706), 5344 states have internal predecessors, (7706), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:37,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5345 states to 5345 states and 7706 transitions. [2021-11-23 17:15:37,430 INFO L78 Accepts]: Start accepts. Automaton has 5345 states and 7706 transitions. Word has length 94 [2021-11-23 17:15:37,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:37,431 INFO L470 AbstractCegarLoop]: Abstraction has 5345 states and 7706 transitions. [2021-11-23 17:15:37,432 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.5625) internal successors, (169), 15 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:37,432 INFO L276 IsEmpty]: Start isEmpty. Operand 5345 states and 7706 transitions. [2021-11-23 17:15:37,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:15:37,436 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:37,436 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:37,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:37,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:37,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:38,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:38,061 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:38,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:38,062 INFO L85 PathProgramCache]: Analyzing trace with hash -388454592, now seen corresponding path program 1 times [2021-11-23 17:15:38,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:38,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [274032293] [2021-11-23 17:15:38,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:38,062 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:38,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:38,063 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:38,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 17:15:38,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:38,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:15:38,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:38,306 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:38,306 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:38,306 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:38,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [274032293] [2021-11-23 17:15:38,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [274032293] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:38,307 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:38,307 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:15:38,307 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774013307] [2021-11-23 17:15:38,307 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:38,308 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:15:38,308 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:38,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:15:38,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:38,309 INFO L87 Difference]: Start difference. First operand 5345 states and 7706 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:38,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:38,498 INFO L93 Difference]: Finished difference Result 10613 states and 15324 transitions. [2021-11-23 17:15:38,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:38,499 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 0 states have call successors, (0), 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 94 [2021-11-23 17:15:38,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:38,511 INFO L225 Difference]: With dead ends: 10613 [2021-11-23 17:15:38,511 INFO L226 Difference]: Without dead ends: 5347 [2021-11-23 17:15:38,519 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:38,520 INFO L933 BasicCegarLoop]: 156 mSDtfsCounter, 49 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:38,520 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 262 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:15:38,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5347 states. [2021-11-23 17:15:38,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5347 to 5345. [2021-11-23 17:15:38,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5345 states, 5344 states have (on average 1.4281437125748504) internal successors, (7632), 5344 states have internal predecessors, (7632), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:38,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5345 states to 5345 states and 7632 transitions. [2021-11-23 17:15:38,841 INFO L78 Accepts]: Start accepts. Automaton has 5345 states and 7632 transitions. Word has length 94 [2021-11-23 17:15:38,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:38,842 INFO L470 AbstractCegarLoop]: Abstraction has 5345 states and 7632 transitions. [2021-11-23 17:15:38,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:38,843 INFO L276 IsEmpty]: Start isEmpty. Operand 5345 states and 7632 transitions. [2021-11-23 17:15:38,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:15:38,848 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:38,849 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:38,868 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:39,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:39,062 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:39,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:39,062 INFO L85 PathProgramCache]: Analyzing trace with hash 1304741440, now seen corresponding path program 1 times [2021-11-23 17:15:39,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:39,063 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [810209054] [2021-11-23 17:15:39,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:39,063 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:39,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:39,064 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:39,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 17:15:39,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:39,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:15:39,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:39,330 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:39,330 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:39,330 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:39,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [810209054] [2021-11-23 17:15:39,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [810209054] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:39,331 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:39,331 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:15:39,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333272274] [2021-11-23 17:15:39,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:39,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:15:39,335 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:39,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:15:39,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:39,336 INFO L87 Difference]: Start difference. First operand 5345 states and 7632 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:39,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:39,420 INFO L93 Difference]: Finished difference Result 7201 states and 10307 transitions. [2021-11-23 17:15:39,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:39,420 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 0 states have call successors, (0), 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 94 [2021-11-23 17:15:39,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:39,425 INFO L225 Difference]: With dead ends: 7201 [2021-11-23 17:15:39,425 INFO L226 Difference]: Without dead ends: 1935 [2021-11-23 17:15:39,431 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:39,432 INFO L933 BasicCegarLoop]: 151 mSDtfsCounter, 43 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:39,432 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 253 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:15:39,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1935 states. [2021-11-23 17:15:39,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1935 to 1927. [2021-11-23 17:15:39,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1927 states, 1926 states have (on average 1.416926272066459) internal successors, (2729), 1926 states have internal predecessors, (2729), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:39,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1927 states to 1927 states and 2729 transitions. [2021-11-23 17:15:39,528 INFO L78 Accepts]: Start accepts. Automaton has 1927 states and 2729 transitions. Word has length 94 [2021-11-23 17:15:39,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:39,528 INFO L470 AbstractCegarLoop]: Abstraction has 1927 states and 2729 transitions. [2021-11-23 17:15:39,529 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:39,529 INFO L276 IsEmpty]: Start isEmpty. Operand 1927 states and 2729 transitions. [2021-11-23 17:15:39,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:15:39,531 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:39,531 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:39,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:39,748 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:39,748 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:39,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:39,749 INFO L85 PathProgramCache]: Analyzing trace with hash -1295160628, now seen corresponding path program 1 times [2021-11-23 17:15:39,749 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:39,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1701570617] [2021-11-23 17:15:39,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:39,750 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:39,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:39,750 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:39,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 17:15:39,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:39,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:15:39,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:40,380 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:15:40,381 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:40,381 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:40,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1701570617] [2021-11-23 17:15:40,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1701570617] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:40,382 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:40,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:15:40,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556634346] [2021-11-23 17:15:40,382 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:40,383 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:15:40,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:40,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:15:40,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:15:40,384 INFO L87 Difference]: Start difference. First operand 1927 states and 2729 transitions. Second operand has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 5 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:40,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:40,512 INFO L93 Difference]: Finished difference Result 3759 states and 5352 transitions. [2021-11-23 17:15:40,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:15:40,512 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 5 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2021-11-23 17:15:40,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:40,516 INFO L225 Difference]: With dead ends: 3759 [2021-11-23 17:15:40,516 INFO L226 Difference]: Without dead ends: 1927 [2021-11-23 17:15:40,520 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:15:40,521 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 30 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 334 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 61 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:40,521 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 334 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2 Invalid, 0 Unknown, 61 Unchecked, 0.0s Time] [2021-11-23 17:15:40,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1927 states. [2021-11-23 17:15:40,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1927 to 1927. [2021-11-23 17:15:40,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1927 states, 1926 states have (on average 1.4164070612668744) internal successors, (2728), 1926 states have internal predecessors, (2728), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:40,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1927 states to 1927 states and 2728 transitions. [2021-11-23 17:15:40,610 INFO L78 Accepts]: Start accepts. Automaton has 1927 states and 2728 transitions. Word has length 94 [2021-11-23 17:15:40,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:40,610 INFO L470 AbstractCegarLoop]: Abstraction has 1927 states and 2728 transitions. [2021-11-23 17:15:40,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 5 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:40,611 INFO L276 IsEmpty]: Start isEmpty. Operand 1927 states and 2728 transitions. [2021-11-23 17:15:40,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:15:40,612 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:40,612 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:40,620 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:40,813 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:40,813 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:40,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:40,814 INFO L85 PathProgramCache]: Analyzing trace with hash -347186740, now seen corresponding path program 1 times [2021-11-23 17:15:40,814 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:40,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [144942468] [2021-11-23 17:15:40,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:40,815 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:40,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:40,817 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:40,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 17:15:40,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:40,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:15:40,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:41,372 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:15:41,372 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:41,372 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:41,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [144942468] [2021-11-23 17:15:41,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [144942468] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:41,373 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:41,373 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:15:41,373 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903775561] [2021-11-23 17:15:41,373 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:41,373 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:15:41,373 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:41,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:15:41,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:15:41,374 INFO L87 Difference]: Start difference. First operand 1927 states and 2728 transitions. Second operand has 6 states, 6 states have (on average 15.0) internal successors, (90), 5 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:41,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:41,498 INFO L93 Difference]: Finished difference Result 3763 states and 5356 transitions. [2021-11-23 17:15:41,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:15:41,498 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.0) internal successors, (90), 5 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2021-11-23 17:15:41,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:41,503 INFO L225 Difference]: With dead ends: 3763 [2021-11-23 17:15:41,503 INFO L226 Difference]: Without dead ends: 1927 [2021-11-23 17:15:41,506 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:15:41,506 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 42 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 19 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:41,507 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 230 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 19 Unchecked, 0.0s Time] [2021-11-23 17:15:41,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1927 states. [2021-11-23 17:15:41,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1927 to 1927. [2021-11-23 17:15:41,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1927 states, 1926 states have (on average 1.4158878504672898) internal successors, (2727), 1926 states have internal predecessors, (2727), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:41,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1927 states to 1927 states and 2727 transitions. [2021-11-23 17:15:41,595 INFO L78 Accepts]: Start accepts. Automaton has 1927 states and 2727 transitions. Word has length 94 [2021-11-23 17:15:41,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:41,596 INFO L470 AbstractCegarLoop]: Abstraction has 1927 states and 2727 transitions. [2021-11-23 17:15:41,596 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.0) internal successors, (90), 5 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:41,596 INFO L276 IsEmpty]: Start isEmpty. Operand 1927 states and 2727 transitions. [2021-11-23 17:15:41,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:15:41,598 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:41,598 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:41,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:41,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:41,809 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:41,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:41,809 INFO L85 PathProgramCache]: Analyzing trace with hash 197118156, now seen corresponding path program 1 times [2021-11-23 17:15:41,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:41,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1723823146] [2021-11-23 17:15:41,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:41,810 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:41,810 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:41,811 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:41,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:15:41,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:41,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:15:41,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:42,376 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:15:42,376 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:42,376 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:42,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1723823146] [2021-11-23 17:15:42,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1723823146] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:42,377 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:42,377 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:15:42,377 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84082108] [2021-11-23 17:15:42,377 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:42,378 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:15:42,378 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:42,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:15:42,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:15:42,379 INFO L87 Difference]: Start difference. First operand 1927 states and 2727 transitions. Second operand has 6 states, 6 states have (on average 14.833333333333334) internal successors, (89), 5 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:42,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:42,535 INFO L93 Difference]: Finished difference Result 3767 states and 5360 transitions. [2021-11-23 17:15:42,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:15:42,535 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.833333333333334) internal successors, (89), 5 states have internal predecessors, (89), 0 states have call successors, (0), 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 94 [2021-11-23 17:15:42,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:42,539 INFO L225 Difference]: With dead ends: 3767 [2021-11-23 17:15:42,540 INFO L226 Difference]: Without dead ends: 1927 [2021-11-23 17:15:42,543 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:15:42,544 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 26 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 364 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 67 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:42,544 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 364 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 67 Unchecked, 0.0s Time] [2021-11-23 17:15:42,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1927 states. [2021-11-23 17:15:42,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1927 to 1927. [2021-11-23 17:15:42,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1927 states, 1926 states have (on average 1.415368639667705) internal successors, (2726), 1926 states have internal predecessors, (2726), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:42,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1927 states to 1927 states and 2726 transitions. [2021-11-23 17:15:42,690 INFO L78 Accepts]: Start accepts. Automaton has 1927 states and 2726 transitions. Word has length 94 [2021-11-23 17:15:42,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:42,691 INFO L470 AbstractCegarLoop]: Abstraction has 1927 states and 2726 transitions. [2021-11-23 17:15:42,691 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.833333333333334) internal successors, (89), 5 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:42,691 INFO L276 IsEmpty]: Start isEmpty. Operand 1927 states and 2726 transitions. [2021-11-23 17:15:42,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:15:42,694 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:42,694 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:42,713 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:42,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:42,907 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:42,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:42,908 INFO L85 PathProgramCache]: Analyzing trace with hash -1478379572, now seen corresponding path program 1 times [2021-11-23 17:15:42,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:42,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [635781908] [2021-11-23 17:15:42,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:42,909 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:42,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:42,910 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:42,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 17:15:42,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:42,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:15:42,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:43,492 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:15:43,493 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:43,493 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:43,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [635781908] [2021-11-23 17:15:43,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [635781908] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:43,493 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:43,493 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:15:43,493 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374535400] [2021-11-23 17:15:43,494 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:43,494 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:15:43,494 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:43,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:15:43,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:15:43,495 INFO L87 Difference]: Start difference. First operand 1927 states and 2726 transitions. Second operand has 6 states, 6 states have (on average 14.666666666666666) internal successors, (88), 5 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:43,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:43,629 INFO L93 Difference]: Finished difference Result 3771 states and 5364 transitions. [2021-11-23 17:15:43,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:15:43,630 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.666666666666666) internal successors, (88), 5 states have internal predecessors, (88), 0 states have call successors, (0), 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 94 [2021-11-23 17:15:43,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:43,634 INFO L225 Difference]: With dead ends: 3771 [2021-11-23 17:15:43,634 INFO L226 Difference]: Without dead ends: 1927 [2021-11-23 17:15:43,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:15:43,638 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 48 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 15 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:43,638 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 218 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 28 Invalid, 0 Unknown, 15 Unchecked, 0.0s Time] [2021-11-23 17:15:43,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1927 states. [2021-11-23 17:15:43,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1927 to 1927. [2021-11-23 17:15:43,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1927 states, 1926 states have (on average 1.4148494288681204) internal successors, (2725), 1926 states have internal predecessors, (2725), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:43,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1927 states to 1927 states and 2725 transitions. [2021-11-23 17:15:43,739 INFO L78 Accepts]: Start accepts. Automaton has 1927 states and 2725 transitions. Word has length 94 [2021-11-23 17:15:43,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:43,740 INFO L470 AbstractCegarLoop]: Abstraction has 1927 states and 2725 transitions. [2021-11-23 17:15:43,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.666666666666666) internal successors, (88), 5 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:43,740 INFO L276 IsEmpty]: Start isEmpty. Operand 1927 states and 2725 transitions. [2021-11-23 17:15:43,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 17:15:43,745 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:43,746 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:43,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:43,958 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:43,958 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:43,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:43,958 INFO L85 PathProgramCache]: Analyzing trace with hash 1936991948, now seen corresponding path program 1 times [2021-11-23 17:15:43,959 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:43,959 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1323680359] [2021-11-23 17:15:43,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:43,959 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:43,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:43,960 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:43,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:15:44,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:44,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:15:44,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:44,491 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:15:44,491 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:44,491 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:44,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1323680359] [2021-11-23 17:15:44,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1323680359] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:44,492 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:44,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:15:44,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088040027] [2021-11-23 17:15:44,492 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:44,492 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:15:44,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:44,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:15:44,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:15:44,493 INFO L87 Difference]: Start difference. First operand 1927 states and 2725 transitions. Second operand has 6 states, 6 states have (on average 14.5) internal successors, (87), 5 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:44,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:44,618 INFO L93 Difference]: Finished difference Result 3753 states and 5342 transitions. [2021-11-23 17:15:44,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:15:44,618 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.5) internal successors, (87), 5 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2021-11-23 17:15:44,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:44,622 INFO L225 Difference]: With dead ends: 3753 [2021-11-23 17:15:44,622 INFO L226 Difference]: Without dead ends: 1905 [2021-11-23 17:15:44,624 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:15:44,625 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 34 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 10 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:44,625 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 254 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 64 Invalid, 0 Unknown, 10 Unchecked, 0.1s Time] [2021-11-23 17:15:44,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1905 states. [2021-11-23 17:15:44,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1905 to 1905. [2021-11-23 17:15:44,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1905 states, 1904 states have (on average 1.4170168067226891) internal successors, (2698), 1904 states have internal predecessors, (2698), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:44,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1905 states to 1905 states and 2698 transitions. [2021-11-23 17:15:44,732 INFO L78 Accepts]: Start accepts. Automaton has 1905 states and 2698 transitions. Word has length 94 [2021-11-23 17:15:44,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:44,732 INFO L470 AbstractCegarLoop]: Abstraction has 1905 states and 2698 transitions. [2021-11-23 17:15:44,732 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.5) internal successors, (87), 5 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:44,732 INFO L276 IsEmpty]: Start isEmpty. Operand 1905 states and 2698 transitions. [2021-11-23 17:15:44,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 17:15:44,734 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:44,734 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:44,746 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:44,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:44,946 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:44,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:44,946 INFO L85 PathProgramCache]: Analyzing trace with hash 727092341, now seen corresponding path program 1 times [2021-11-23 17:15:44,946 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:44,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1283319641] [2021-11-23 17:15:44,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:44,947 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:44,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:44,947 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:44,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 17:15:45,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:45,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:45,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:46,312 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 17:15:46,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:46,768 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 17:15:46,768 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:46,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1283319641] [2021-11-23 17:15:46,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1283319641] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:46,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1169212948] [2021-11-23 17:15:46,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:46,768 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:46,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:46,769 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:46,772 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-23 17:15:46,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:46,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:46,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:48,007 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 17:15:48,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:48,381 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 17:15:48,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1169212948] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:48,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [605976223] [2021-11-23 17:15:48,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:48,381 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:15:48,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:15:48,383 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:15:48,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-23 17:15:48,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:48,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:48,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:49,560 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 17:15:49,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:49,901 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 17:15:49,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [605976223] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:49,902 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:15:49,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:15:49,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25022330] [2021-11-23 17:15:49,903 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:15:49,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:15:49,904 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:49,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:15:49,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:15:49,905 INFO L87 Difference]: Start difference. First operand 1905 states and 2698 transitions. Second operand has 16 states, 16 states have (on average 10.9375) internal successors, (175), 15 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:50,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:50,096 INFO L93 Difference]: Finished difference Result 3745 states and 5339 transitions. [2021-11-23 17:15:50,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 17:15:50,096 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.9375) internal successors, (175), 15 states have internal predecessors, (175), 0 states have call successors, (0), 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 95 [2021-11-23 17:15:50,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:50,101 INFO L225 Difference]: With dead ends: 3745 [2021-11-23 17:15:50,101 INFO L226 Difference]: Without dead ends: 1919 [2021-11-23 17:15:50,103 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 567 GetRequests, 550 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:15:50,104 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 126 mSDsluCounter, 617 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 715 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 73 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:50,105 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 715 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 88 Invalid, 0 Unknown, 73 Unchecked, 0.1s Time] [2021-11-23 17:15:50,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1919 states. [2021-11-23 17:15:50,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1919 to 1917. [2021-11-23 17:15:50,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1917 states, 1916 states have (on average 1.417536534446764) internal successors, (2716), 1916 states have internal predecessors, (2716), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:50,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1917 states to 1917 states and 2716 transitions. [2021-11-23 17:15:50,201 INFO L78 Accepts]: Start accepts. Automaton has 1917 states and 2716 transitions. Word has length 95 [2021-11-23 17:15:50,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:50,201 INFO L470 AbstractCegarLoop]: Abstraction has 1917 states and 2716 transitions. [2021-11-23 17:15:50,202 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.9375) internal successors, (175), 15 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:50,202 INFO L276 IsEmpty]: Start isEmpty. Operand 1917 states and 2716 transitions. [2021-11-23 17:15:50,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 17:15:50,204 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:50,204 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:50,217 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:50,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:50,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:50,815 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:50,815 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:50,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:50,816 INFO L85 PathProgramCache]: Analyzing trace with hash -867192341, now seen corresponding path program 1 times [2021-11-23 17:15:50,816 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:50,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2116319576] [2021-11-23 17:15:50,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:50,816 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:50,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:50,817 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:50,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:15:50,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:50,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:15:50,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:51,047 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:51,047 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:51,047 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:51,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2116319576] [2021-11-23 17:15:51,048 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2116319576] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:51,048 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:51,048 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:15:51,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716562999] [2021-11-23 17:15:51,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:51,049 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:15:51,049 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:51,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:15:51,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:51,050 INFO L87 Difference]: Start difference. First operand 1917 states and 2716 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:51,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:51,103 INFO L93 Difference]: Finished difference Result 2833 states and 4026 transitions. [2021-11-23 17:15:51,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:51,104 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 0 states have call successors, (0), 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 95 [2021-11-23 17:15:51,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:51,106 INFO L225 Difference]: With dead ends: 2833 [2021-11-23 17:15:51,106 INFO L226 Difference]: Without dead ends: 1007 [2021-11-23 17:15:51,108 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:51,109 INFO L933 BasicCegarLoop]: 147 mSDtfsCounter, 40 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:51,109 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 237 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:15:51,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1007 states. [2021-11-23 17:15:51,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1007 to 1005. [2021-11-23 17:15:51,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1005 states, 1004 states have (on average 1.3884462151394423) internal successors, (1394), 1004 states have internal predecessors, (1394), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:51,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1005 states to 1005 states and 1394 transitions. [2021-11-23 17:15:51,161 INFO L78 Accepts]: Start accepts. Automaton has 1005 states and 1394 transitions. Word has length 95 [2021-11-23 17:15:51,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:51,162 INFO L470 AbstractCegarLoop]: Abstraction has 1005 states and 1394 transitions. [2021-11-23 17:15:51,162 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:51,162 INFO L276 IsEmpty]: Start isEmpty. Operand 1005 states and 1394 transitions. [2021-11-23 17:15:51,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 17:15:51,163 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:51,164 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:51,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:51,374 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:51,375 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:51,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:51,375 INFO L85 PathProgramCache]: Analyzing trace with hash 47806305, now seen corresponding path program 1 times [2021-11-23 17:15:51,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:51,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1142590556] [2021-11-23 17:15:51,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:51,376 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:51,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:51,377 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:51,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 17:15:51,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:51,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:51,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:52,594 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:52,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:53,095 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:53,095 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:53,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1142590556] [2021-11-23 17:15:53,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1142590556] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:53,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1808548434] [2021-11-23 17:15:53,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:53,095 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:53,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:53,096 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:53,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-23 17:15:53,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:53,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:53,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:54,500 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:54,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:54,923 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:54,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1808548434] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:54,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [381155019] [2021-11-23 17:15:54,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:54,924 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:15:54,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:15:54,929 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:15:54,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-23 17:15:55,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:55,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:55,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:56,013 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:56,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:56,423 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:56,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [381155019] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:56,424 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:15:56,424 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:15:56,424 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1066034233] [2021-11-23 17:15:56,424 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:15:56,425 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:15:56,425 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:56,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:15:56,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:15:56,426 INFO L87 Difference]: Start difference. First operand 1005 states and 1394 transitions. Second operand has 16 states, 16 states have (on average 11.3125) internal successors, (181), 15 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:56,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:56,599 INFO L93 Difference]: Finished difference Result 1933 states and 2715 transitions. [2021-11-23 17:15:56,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:15:56,602 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.3125) internal successors, (181), 15 states have internal predecessors, (181), 0 states have call successors, (0), 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 96 [2021-11-23 17:15:56,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:56,603 INFO L225 Difference]: With dead ends: 1933 [2021-11-23 17:15:56,603 INFO L226 Difference]: Without dead ends: 1019 [2021-11-23 17:15:56,604 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 574 GetRequests, 556 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:15:56,606 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 132 mSDsluCounter, 707 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 803 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 71 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:56,606 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 803 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 76 Invalid, 0 Unknown, 71 Unchecked, 0.0s Time] [2021-11-23 17:15:56,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1019 states. [2021-11-23 17:15:56,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1019 to 1017. [2021-11-23 17:15:56,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1017 states, 1016 states have (on average 1.389763779527559) internal successors, (1412), 1016 states have internal predecessors, (1412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:56,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1017 states to 1017 states and 1412 transitions. [2021-11-23 17:15:56,659 INFO L78 Accepts]: Start accepts. Automaton has 1017 states and 1412 transitions. Word has length 96 [2021-11-23 17:15:56,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:56,660 INFO L470 AbstractCegarLoop]: Abstraction has 1017 states and 1412 transitions. [2021-11-23 17:15:56,660 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.3125) internal successors, (181), 15 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:56,660 INFO L276 IsEmpty]: Start isEmpty. Operand 1017 states and 1412 transitions. [2021-11-23 17:15:56,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 17:15:56,661 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:56,662 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:56,699 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:56,882 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Ended with exit code 0 [2021-11-23 17:15:57,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:57,281 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:57,281 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:57,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:57,281 INFO L85 PathProgramCache]: Analyzing trace with hash 385599447, now seen corresponding path program 1 times [2021-11-23 17:15:57,282 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:57,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2106489673] [2021-11-23 17:15:57,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:57,282 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:57,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:57,283 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:57,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 17:15:57,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:57,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:15:57,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:57,503 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:57,503 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:15:57,503 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:57,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2106489673] [2021-11-23 17:15:57,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2106489673] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:15:57,503 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:15:57,504 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:15:57,504 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89466937] [2021-11-23 17:15:57,504 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:15:57,504 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:15:57,504 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:15:57,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:15:57,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:57,505 INFO L87 Difference]: Start difference. First operand 1017 states and 1412 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:57,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:15:57,529 INFO L93 Difference]: Finished difference Result 1477 states and 2062 transitions. [2021-11-23 17:15:57,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:15:57,529 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 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 96 [2021-11-23 17:15:57,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:15:57,531 INFO L225 Difference]: With dead ends: 1477 [2021-11-23 17:15:57,531 INFO L226 Difference]: Without dead ends: 563 [2021-11-23 17:15:57,532 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:15:57,533 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 35 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:15:57,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 221 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:15:57,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 563 states. [2021-11-23 17:15:57,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 563 to 561. [2021-11-23 17:15:57,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 561 states, 560 states have (on average 1.35) internal successors, (756), 560 states have internal predecessors, (756), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:57,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 561 states to 561 states and 756 transitions. [2021-11-23 17:15:57,563 INFO L78 Accepts]: Start accepts. Automaton has 561 states and 756 transitions. Word has length 96 [2021-11-23 17:15:57,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:15:57,563 INFO L470 AbstractCegarLoop]: Abstraction has 561 states and 756 transitions. [2021-11-23 17:15:57,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 3 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:15:57,564 INFO L276 IsEmpty]: Start isEmpty. Operand 561 states and 756 transitions. [2021-11-23 17:15:57,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-23 17:15:57,565 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:15:57,565 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:15:57,579 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:15:57,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:15:57,777 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:15:57,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:15:57,778 INFO L85 PathProgramCache]: Analyzing trace with hash 160920236, now seen corresponding path program 1 times [2021-11-23 17:15:57,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:15:57,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2005723767] [2021-11-23 17:15:57,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:57,778 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:15:57,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:15:57,779 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:15:57,781 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-23 17:15:57,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:57,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:57,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:15:59,089 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:59,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:15:59,585 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:15:59,585 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:15:59,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2005723767] [2021-11-23 17:15:59,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2005723767] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:15:59,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1127992837] [2021-11-23 17:15:59,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:15:59,586 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:15:59,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:15:59,589 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:15:59,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-23 17:15:59,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:15:59,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:15:59,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:01,027 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:01,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:01,622 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:01,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1127992837] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:01,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1678610504] [2021-11-23 17:16:01,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:01,622 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:16:01,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:16:01,623 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:16:01,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-23 17:16:01,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:01,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:16:01,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:02,703 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:02,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:03,152 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:03,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1678610504] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:03,152 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:16:03,152 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:16:03,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362781624] [2021-11-23 17:16:03,153 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:16:03,154 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:16:03,154 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:03,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:16:03,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:16:03,155 INFO L87 Difference]: Start difference. First operand 561 states and 756 transitions. Second operand has 16 states, 16 states have (on average 11.6875) internal successors, (187), 15 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:03,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:03,321 INFO L93 Difference]: Finished difference Result 1033 states and 1423 transitions. [2021-11-23 17:16:03,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:16:03,322 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 11.6875) internal successors, (187), 15 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 97 [2021-11-23 17:16:03,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:03,323 INFO L225 Difference]: With dead ends: 1033 [2021-11-23 17:16:03,323 INFO L226 Difference]: Without dead ends: 575 [2021-11-23 17:16:03,324 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 581 GetRequests, 563 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=82, Invalid=298, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:16:03,325 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 183 mSDsluCounter, 661 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 755 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 78 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:03,326 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 755 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 34 Invalid, 0 Unknown, 78 Unchecked, 0.0s Time] [2021-11-23 17:16:03,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-23 17:16:03,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 573. [2021-11-23 17:16:03,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 573 states, 572 states have (on average 1.3531468531468531) internal successors, (774), 572 states have internal predecessors, (774), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:03,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 573 states to 573 states and 774 transitions. [2021-11-23 17:16:03,351 INFO L78 Accepts]: Start accepts. Automaton has 573 states and 774 transitions. Word has length 97 [2021-11-23 17:16:03,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:03,351 INFO L470 AbstractCegarLoop]: Abstraction has 573 states and 774 transitions. [2021-11-23 17:16:03,351 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 11.6875) internal successors, (187), 15 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:03,352 INFO L276 IsEmpty]: Start isEmpty. Operand 573 states and 774 transitions. [2021-11-23 17:16:03,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-23 17:16:03,352 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:03,353 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:16:03,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:03,562 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Ended with exit code 0 [2021-11-23 17:16:03,778 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-11-23 17:16:03,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:16:03,955 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:03,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:03,956 INFO L85 PathProgramCache]: Analyzing trace with hash 1378905634, now seen corresponding path program 1 times [2021-11-23 17:16:03,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:03,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1917756230] [2021-11-23 17:16:03,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:03,956 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:03,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:03,957 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:03,958 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 17:16:04,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:04,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:16:04,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:04,159 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:04,160 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:04,160 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:04,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1917756230] [2021-11-23 17:16:04,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1917756230] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:04,160 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:04,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:16:04,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407752734] [2021-11-23 17:16:04,160 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:04,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:16:04,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:04,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:16:04,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:16:04,161 INFO L87 Difference]: Start difference. First operand 573 states and 774 transitions. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:04,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:04,193 INFO L93 Difference]: Finished difference Result 805 states and 1097 transitions. [2021-11-23 17:16:04,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:16:04,193 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 97 [2021-11-23 17:16:04,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:04,194 INFO L225 Difference]: With dead ends: 805 [2021-11-23 17:16:04,195 INFO L226 Difference]: Without dead ends: 347 [2021-11-23 17:16:04,195 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:16:04,202 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 30 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:04,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 205 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:16:04,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2021-11-23 17:16:04,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 345. [2021-11-23 17:16:04,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 344 states have (on average 1.302325581395349) internal successors, (448), 344 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:04,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 448 transitions. [2021-11-23 17:16:04,224 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 448 transitions. Word has length 97 [2021-11-23 17:16:04,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:04,225 INFO L470 AbstractCegarLoop]: Abstraction has 345 states and 448 transitions. [2021-11-23 17:16:04,225 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:04,225 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 448 transitions. [2021-11-23 17:16:04,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-23 17:16:04,227 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:04,228 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:16:04,243 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:04,439 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:04,440 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:04,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:04,440 INFO L85 PathProgramCache]: Analyzing trace with hash -1089250056, now seen corresponding path program 1 times [2021-11-23 17:16:04,441 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:04,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1255834845] [2021-11-23 17:16:04,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:04,441 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:04,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:04,442 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:04,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 17:16:04,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:04,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:16:04,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:05,478 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:16:05,478 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:05,478 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:05,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1255834845] [2021-11-23 17:16:05,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1255834845] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:05,479 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:05,479 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:16:05,479 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028153147] [2021-11-23 17:16:05,479 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:05,479 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:16:05,479 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:05,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:16:05,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:16:05,480 INFO L87 Difference]: Start difference. First operand 345 states and 448 transitions. Second operand has 7 states, 7 states have (on average 13.285714285714286) internal successors, (93), 7 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:05,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:05,653 INFO L93 Difference]: Finished difference Result 843 states and 1132 transitions. [2021-11-23 17:16:05,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:16:05,654 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.285714285714286) internal successors, (93), 7 states have internal predecessors, (93), 0 states have call successors, (0), 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 98 [2021-11-23 17:16:05,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:05,655 INFO L225 Difference]: With dead ends: 843 [2021-11-23 17:16:05,655 INFO L226 Difference]: Without dead ends: 613 [2021-11-23 17:16:05,655 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:16:05,656 INFO L933 BasicCegarLoop]: 201 mSDtfsCounter, 518 mSDsluCounter, 414 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 518 SdHoareTripleChecker+Valid, 615 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:05,656 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [518 Valid, 615 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:16:05,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 613 states. [2021-11-23 17:16:05,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 613 to 345. [2021-11-23 17:16:05,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 344 states have (on average 1.2848837209302326) internal successors, (442), 344 states have internal predecessors, (442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:05,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 442 transitions. [2021-11-23 17:16:05,672 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 442 transitions. Word has length 98 [2021-11-23 17:16:05,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:05,672 INFO L470 AbstractCegarLoop]: Abstraction has 345 states and 442 transitions. [2021-11-23 17:16:05,672 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.285714285714286) internal successors, (93), 7 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:05,673 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 442 transitions. [2021-11-23 17:16:05,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-23 17:16:05,673 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:05,673 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:16:05,683 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:05,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:05,874 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:05,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:05,874 INFO L85 PathProgramCache]: Analyzing trace with hash 413109051, now seen corresponding path program 1 times [2021-11-23 17:16:05,874 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:05,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2124775978] [2021-11-23 17:16:05,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:05,875 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:05,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:05,876 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:05,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-23 17:16:05,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:05,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:16:05,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:06,793 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:16:06,794 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:06,794 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:06,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2124775978] [2021-11-23 17:16:06,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2124775978] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:06,794 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:06,794 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:16:06,794 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656775036] [2021-11-23 17:16:06,794 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:06,794 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:16:06,795 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:06,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:16:06,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:16:06,795 INFO L87 Difference]: Start difference. First operand 345 states and 442 transitions. Second operand has 7 states, 7 states have (on average 13.428571428571429) internal successors, (94), 7 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:06,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:06,935 INFO L93 Difference]: Finished difference Result 767 states and 1024 transitions. [2021-11-23 17:16:06,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:16:06,936 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.428571428571429) internal successors, (94), 7 states have internal predecessors, (94), 0 states have call successors, (0), 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 98 [2021-11-23 17:16:06,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:06,938 INFO L225 Difference]: With dead ends: 767 [2021-11-23 17:16:06,938 INFO L226 Difference]: Without dead ends: 689 [2021-11-23 17:16:06,939 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:16:06,939 INFO L933 BasicCegarLoop]: 208 mSDtfsCounter, 498 mSDsluCounter, 503 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 498 SdHoareTripleChecker+Valid, 711 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:06,940 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [498 Valid, 711 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:16:06,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 689 states. [2021-11-23 17:16:06,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 689 to 425. [2021-11-23 17:16:06,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 425 states, 424 states have (on average 1.2924528301886793) internal successors, (548), 424 states have internal predecessors, (548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:06,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 425 states to 425 states and 548 transitions. [2021-11-23 17:16:06,971 INFO L78 Accepts]: Start accepts. Automaton has 425 states and 548 transitions. Word has length 98 [2021-11-23 17:16:06,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:06,972 INFO L470 AbstractCegarLoop]: Abstraction has 425 states and 548 transitions. [2021-11-23 17:16:06,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.428571428571429) internal successors, (94), 7 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:06,972 INFO L276 IsEmpty]: Start isEmpty. Operand 425 states and 548 transitions. [2021-11-23 17:16:06,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-23 17:16:06,973 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:06,973 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:16:06,987 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:07,188 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:07,188 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:07,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:07,189 INFO L85 PathProgramCache]: Analyzing trace with hash -942354728, now seen corresponding path program 1 times [2021-11-23 17:16:07,189 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:07,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [431119371] [2021-11-23 17:16:07,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:07,189 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:07,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:07,190 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:07,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-23 17:16:07,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:07,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:16:07,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:08,319 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:16:08,319 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:08,319 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:08,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [431119371] [2021-11-23 17:16:08,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [431119371] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:08,320 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:08,320 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:16:08,320 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71873651] [2021-11-23 17:16:08,320 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:08,320 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:16:08,320 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:08,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:16:08,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:16:08,321 INFO L87 Difference]: Start difference. First operand 425 states and 548 transitions. Second operand has 7 states, 7 states have (on average 13.571428571428571) internal successors, (95), 7 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:08,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:08,481 INFO L93 Difference]: Finished difference Result 847 states and 1130 transitions. [2021-11-23 17:16:08,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:16:08,481 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.571428571428571) internal successors, (95), 7 states have internal predecessors, (95), 0 states have call successors, (0), 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 98 [2021-11-23 17:16:08,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:08,482 INFO L225 Difference]: With dead ends: 847 [2021-11-23 17:16:08,482 INFO L226 Difference]: Without dead ends: 769 [2021-11-23 17:16:08,483 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:16:08,483 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 459 mSDsluCounter, 507 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 459 SdHoareTripleChecker+Valid, 722 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:08,484 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [459 Valid, 722 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:16:08,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 769 states. [2021-11-23 17:16:08,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 769 to 511. [2021-11-23 17:16:08,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 511 states, 510 states have (on average 1.2980392156862746) internal successors, (662), 510 states have internal predecessors, (662), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:08,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 511 states to 511 states and 662 transitions. [2021-11-23 17:16:08,526 INFO L78 Accepts]: Start accepts. Automaton has 511 states and 662 transitions. Word has length 98 [2021-11-23 17:16:08,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:08,527 INFO L470 AbstractCegarLoop]: Abstraction has 511 states and 662 transitions. [2021-11-23 17:16:08,527 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.571428571428571) internal successors, (95), 7 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:08,527 INFO L276 IsEmpty]: Start isEmpty. Operand 511 states and 662 transitions. [2021-11-23 17:16:08,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-23 17:16:08,528 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:08,528 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:16:08,540 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Ended with exit code 0 [2021-11-23 17:16:08,740 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:08,741 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:08,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:08,741 INFO L85 PathProgramCache]: Analyzing trace with hash -1302706853, now seen corresponding path program 1 times [2021-11-23 17:16:08,741 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:08,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1566684054] [2021-11-23 17:16:08,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:08,742 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:08,742 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:08,742 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:08,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-23 17:16:08,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:08,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:16:08,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:09,941 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:16:09,941 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:09,941 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:09,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1566684054] [2021-11-23 17:16:09,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1566684054] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:09,942 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:09,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:16:09,942 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964912036] [2021-11-23 17:16:09,942 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:09,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:16:09,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:09,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:16:09,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:16:09,943 INFO L87 Difference]: Start difference. First operand 511 states and 662 transitions. Second operand has 7 states, 7 states have (on average 13.714285714285714) internal successors, (96), 7 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:10,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:10,079 INFO L93 Difference]: Finished difference Result 933 states and 1244 transitions. [2021-11-23 17:16:10,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:16:10,079 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.714285714285714) internal successors, (96), 7 states have internal predecessors, (96), 0 states have call successors, (0), 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 98 [2021-11-23 17:16:10,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:10,081 INFO L225 Difference]: With dead ends: 933 [2021-11-23 17:16:10,081 INFO L226 Difference]: Without dead ends: 855 [2021-11-23 17:16:10,081 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:16:10,082 INFO L933 BasicCegarLoop]: 216 mSDtfsCounter, 606 mSDsluCounter, 533 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 606 SdHoareTripleChecker+Valid, 749 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:10,082 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [606 Valid, 749 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:16:10,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 855 states. [2021-11-23 17:16:10,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 855 to 603. [2021-11-23 17:16:10,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 603 states, 602 states have (on average 1.302325581395349) internal successors, (784), 602 states have internal predecessors, (784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:10,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 603 states to 603 states and 784 transitions. [2021-11-23 17:16:10,124 INFO L78 Accepts]: Start accepts. Automaton has 603 states and 784 transitions. Word has length 98 [2021-11-23 17:16:10,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:10,125 INFO L470 AbstractCegarLoop]: Abstraction has 603 states and 784 transitions. [2021-11-23 17:16:10,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.714285714285714) internal successors, (96), 7 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:10,125 INFO L276 IsEmpty]: Start isEmpty. Operand 603 states and 784 transitions. [2021-11-23 17:16:10,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-23 17:16:10,126 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:10,126 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:16:10,137 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:10,337 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:10,337 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:10,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:10,337 INFO L85 PathProgramCache]: Analyzing trace with hash -833001288, now seen corresponding path program 1 times [2021-11-23 17:16:10,338 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:10,338 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1279737129] [2021-11-23 17:16:10,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:10,338 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:10,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:10,339 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:10,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-23 17:16:10,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:10,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:16:10,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:11,528 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:16:11,528 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:16:11,528 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:11,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1279737129] [2021-11-23 17:16:11,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1279737129] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:16:11,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:16:11,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 17:16:11,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235935057] [2021-11-23 17:16:11,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:16:11,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:16:11,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:11,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:16:11,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:16:11,530 INFO L87 Difference]: Start difference. First operand 603 states and 784 transitions. Second operand has 7 states, 7 states have (on average 13.857142857142858) internal successors, (97), 7 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:11,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:11,672 INFO L93 Difference]: Finished difference Result 1025 states and 1366 transitions. [2021-11-23 17:16:11,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:16:11,673 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.857142857142858) internal successors, (97), 7 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 98 [2021-11-23 17:16:11,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:11,674 INFO L225 Difference]: With dead ends: 1025 [2021-11-23 17:16:11,674 INFO L226 Difference]: Without dead ends: 947 [2021-11-23 17:16:11,675 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:16:11,675 INFO L933 BasicCegarLoop]: 203 mSDtfsCounter, 434 mSDsluCounter, 432 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 434 SdHoareTripleChecker+Valid, 635 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:11,675 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [434 Valid, 635 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:16:11,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 947 states. [2021-11-23 17:16:11,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 947 to 695. [2021-11-23 17:16:11,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 695 states, 694 states have (on average 1.3054755043227666) internal successors, (906), 694 states have internal predecessors, (906), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:11,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 695 states to 695 states and 906 transitions. [2021-11-23 17:16:11,710 INFO L78 Accepts]: Start accepts. Automaton has 695 states and 906 transitions. Word has length 98 [2021-11-23 17:16:11,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:11,710 INFO L470 AbstractCegarLoop]: Abstraction has 695 states and 906 transitions. [2021-11-23 17:16:11,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.857142857142858) internal successors, (97), 7 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:11,710 INFO L276 IsEmpty]: Start isEmpty. Operand 695 states and 906 transitions. [2021-11-23 17:16:11,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 17:16:11,711 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:11,711 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:16:11,722 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:11,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:16:11,912 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:11,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:11,913 INFO L85 PathProgramCache]: Analyzing trace with hash -1576868362, now seen corresponding path program 1 times [2021-11-23 17:16:11,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:11,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1340346723] [2021-11-23 17:16:11,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:11,913 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:11,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:11,914 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:11,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-23 17:16:11,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:11,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:16:11,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:20,670 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:20,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:25,616 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:25,617 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:16:25,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1340346723] [2021-11-23 17:16:25,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1340346723] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:25,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [97613136] [2021-11-23 17:16:25,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:25,617 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:16:25,617 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:16:25,618 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:16:25,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-11-23 17:16:25,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:25,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:16:25,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:31,281 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:31,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:32,927 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:32,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [97613136] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:32,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [396765544] [2021-11-23 17:16:32,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:32,928 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:16:32,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:16:32,930 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:16:32,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-23 17:16:33,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:33,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 17:16:33,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:16:50,241 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:50,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:16:52,971 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:16:52,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [396765544] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:16:52,971 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:16:52,971 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 28, 18, 15, 35, 30] total 111 [2021-11-23 17:16:52,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018374898] [2021-11-23 17:16:52,972 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:16:52,973 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2021-11-23 17:16:52,973 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:16:52,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2021-11-23 17:16:52,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1462, Invalid=10748, Unknown=0, NotChecked=0, Total=12210 [2021-11-23 17:16:52,979 INFO L87 Difference]: Start difference. First operand 695 states and 906 transitions. Second operand has 111 states, 111 states have (on average 3.6666666666666665) internal successors, (407), 111 states have internal predecessors, (407), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:54,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:16:54,532 INFO L93 Difference]: Finished difference Result 890 states and 1162 transitions. [2021-11-23 17:16:54,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-23 17:16:54,532 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 111 states have (on average 3.6666666666666665) internal successors, (407), 111 states have internal predecessors, (407), 0 states have call successors, (0), 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 99 [2021-11-23 17:16:54,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:16:54,534 INFO L225 Difference]: With dead ends: 890 [2021-11-23 17:16:54,534 INFO L226 Difference]: Without dead ends: 732 [2021-11-23 17:16:54,539 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 479 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5926 ImplicationChecksByTransitivity, 23.9s TimeCoverageRelationStatistics Valid=1565, Invalid=11317, Unknown=0, NotChecked=0, Total=12882 [2021-11-23 17:16:54,539 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 428 mSDsluCounter, 2173 mSDsCounter, 0 mSdLazyCounter, 500 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 428 SdHoareTripleChecker+Valid, 2253 SdHoareTripleChecker+Invalid, 940 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 500 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 428 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:16:54,540 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [428 Valid, 2253 Invalid, 940 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 500 Invalid, 0 Unknown, 428 Unchecked, 0.7s Time] [2021-11-23 17:16:54,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 732 states. [2021-11-23 17:16:54,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 732 to 711. [2021-11-23 17:16:54,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 711 states, 710 states have (on average 1.3028169014084507) internal successors, (925), 710 states have internal predecessors, (925), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:54,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 711 states to 711 states and 925 transitions. [2021-11-23 17:16:54,595 INFO L78 Accepts]: Start accepts. Automaton has 711 states and 925 transitions. Word has length 99 [2021-11-23 17:16:54,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:16:54,596 INFO L470 AbstractCegarLoop]: Abstraction has 711 states and 925 transitions. [2021-11-23 17:16:54,596 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 111 states, 111 states have (on average 3.6666666666666665) internal successors, (407), 111 states have internal predecessors, (407), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:16:54,596 INFO L276 IsEmpty]: Start isEmpty. Operand 711 states and 925 transitions. [2021-11-23 17:16:54,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 17:16:54,597 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:16:54,597 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:16:54,617 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-11-23 17:16:54,810 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Ended with exit code 0 [2021-11-23 17:16:55,030 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2021-11-23 17:16:55,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:16:55,209 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:16:55,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:16:55,210 INFO L85 PathProgramCache]: Analyzing trace with hash -646572551, now seen corresponding path program 1 times [2021-11-23 17:16:55,210 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:16:55,210 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [390648980] [2021-11-23 17:16:55,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:16:55,210 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:16:55,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:16:55,212 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:16:55,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-23 17:16:55,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:16:55,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:16:55,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:02,291 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 17:17:02,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:07,140 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:07,140 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:07,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [390648980] [2021-11-23 17:17:07,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [390648980] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:07,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1313525311] [2021-11-23 17:17:07,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:07,140 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:07,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:07,141 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:07,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-23 17:17:07,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:07,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 17:17:07,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:23,923 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:23,923 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:29,811 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:29,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1313525311] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:29,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958360888] [2021-11-23 17:17:29,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:29,812 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:29,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:17:29,813 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:17:29,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-23 17:17:29,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:29,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:17:29,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:44,489 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:44,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:47,326 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:47,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [958360888] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:47,326 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:17:47,326 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 29, 32, 31, 34, 28] total 117 [2021-11-23 17:17:47,327 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082042988] [2021-11-23 17:17:47,327 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:17:47,327 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2021-11-23 17:17:47,328 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:17:47,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2021-11-23 17:17:47,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=12244, Unknown=0, NotChecked=0, Total=13572 [2021-11-23 17:17:47,332 INFO L87 Difference]: Start difference. First operand 711 states and 925 transitions. Second operand has 117 states, 117 states have (on average 3.1623931623931623) internal successors, (370), 117 states have internal predecessors, (370), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:53,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:17:53,848 INFO L93 Difference]: Finished difference Result 892 states and 1166 transitions. [2021-11-23 17:17:53,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-23 17:17:53,849 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 3.1623931623931623) internal successors, (370), 117 states have internal predecessors, (370), 0 states have call successors, (0), 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 99 [2021-11-23 17:17:53,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:17:53,850 INFO L225 Difference]: With dead ends: 892 [2021-11-23 17:17:53,850 INFO L226 Difference]: Without dead ends: 724 [2021-11-23 17:17:53,855 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 620 GetRequests, 480 SyntacticMatches, 2 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8050 ImplicationChecksByTransitivity, 36.1s TimeCoverageRelationStatistics Valid=1968, Invalid=17492, Unknown=0, NotChecked=0, Total=19460 [2021-11-23 17:17:53,856 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 350 mSDsluCounter, 2834 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 350 SdHoareTripleChecker+Valid, 2917 SdHoareTripleChecker+Invalid, 1056 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 546 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:17:53,856 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [350 Valid, 2917 Invalid, 1056 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 496 Invalid, 0 Unknown, 546 Unchecked, 0.7s Time] [2021-11-23 17:17:53,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 724 states. [2021-11-23 17:17:53,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 724 to 712. [2021-11-23 17:17:53,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 712 states, 711 states have (on average 1.3023909985935302) internal successors, (926), 711 states have internal predecessors, (926), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:53,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 712 states to 712 states and 926 transitions. [2021-11-23 17:17:53,890 INFO L78 Accepts]: Start accepts. Automaton has 712 states and 926 transitions. Word has length 99 [2021-11-23 17:17:53,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:17:53,890 INFO L470 AbstractCegarLoop]: Abstraction has 712 states and 926 transitions. [2021-11-23 17:17:53,891 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 117 states have (on average 3.1623931623931623) internal successors, (370), 117 states have internal predecessors, (370), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:17:53,891 INFO L276 IsEmpty]: Start isEmpty. Operand 712 states and 926 transitions. [2021-11-23 17:17:53,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 17:17:53,892 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:17:53,892 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:17:53,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:54,124 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Ended with exit code 0 [2021-11-23 17:17:54,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Forceful destruction successful, exit code 0 [2021-11-23 17:17:54,517 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:54,517 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:17:54,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:17:54,518 INFO L85 PathProgramCache]: Analyzing trace with hash 1067413462, now seen corresponding path program 1 times [2021-11-23 17:17:54,518 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:17:54,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [34781090] [2021-11-23 17:17:54,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:54,518 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:17:54,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:17:54,519 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:17:54,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 17:17:54,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:54,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:17:54,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:55,941 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:55,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:56,294 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:56,295 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:17:56,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [34781090] [2021-11-23 17:17:56,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [34781090] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:56,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2116656473] [2021-11-23 17:17:56,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:56,295 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:17:56,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:17:56,296 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:17:56,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-11-23 17:17:56,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:56,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:17:56,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:17:57,962 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:57,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:17:58,444 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:17:58,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2116656473] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:17:58,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [864575278] [2021-11-23 17:17:58,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:17:58,444 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:17:58,445 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:17:58,445 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:17:58,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 17:17:58,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:17:58,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:17:58,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:18,426 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:18,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:23,811 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:23,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [864575278] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:23,811 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:23,812 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 34, 28] total 87 [2021-11-23 17:18:23,812 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47270994] [2021-11-23 17:18:23,812 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:23,813 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-23 17:18:23,814 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:23,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-23 17:18:23,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=726, Invalid=6756, Unknown=0, NotChecked=0, Total=7482 [2021-11-23 17:18:23,816 INFO L87 Difference]: Start difference. First operand 712 states and 926 transitions. Second operand has 87 states, 87 states have (on average 5.632183908045977) internal successors, (490), 87 states have internal predecessors, (490), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:29,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:29,324 INFO L93 Difference]: Finished difference Result 1118 states and 1447 transitions. [2021-11-23 17:18:29,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 17:18:29,324 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 5.632183908045977) internal successors, (490), 87 states have internal predecessors, (490), 0 states have call successors, (0), 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 99 [2021-11-23 17:18:29,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:29,326 INFO L225 Difference]: With dead ends: 1118 [2021-11-23 17:18:29,326 INFO L226 Difference]: Without dead ends: 938 [2021-11-23 17:18:29,327 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 627 GetRequests, 515 SyntacticMatches, 1 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3715 ImplicationChecksByTransitivity, 23.3s TimeCoverageRelationStatistics Valid=1363, Invalid=11293, Unknown=0, NotChecked=0, Total=12656 [2021-11-23 17:18:29,328 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 272 mSDsluCounter, 2979 mSDsCounter, 0 mSdLazyCounter, 653 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 3096 SdHoareTripleChecker+Invalid, 971 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 653 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 295 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:29,328 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [272 Valid, 3096 Invalid, 971 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 653 Invalid, 0 Unknown, 295 Unchecked, 0.9s Time] [2021-11-23 17:18:29,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 938 states. [2021-11-23 17:18:29,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 938 to 713. [2021-11-23 17:18:29,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 713 states, 712 states have (on average 1.3019662921348314) internal successors, (927), 712 states have internal predecessors, (927), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:29,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 713 states to 713 states and 927 transitions. [2021-11-23 17:18:29,366 INFO L78 Accepts]: Start accepts. Automaton has 713 states and 927 transitions. Word has length 99 [2021-11-23 17:18:29,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:29,367 INFO L470 AbstractCegarLoop]: Abstraction has 713 states and 927 transitions. [2021-11-23 17:18:29,367 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 5.632183908045977) internal successors, (490), 87 states have internal predecessors, (490), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:29,367 INFO L276 IsEmpty]: Start isEmpty. Operand 713 states and 927 transitions. [2021-11-23 17:18:29,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-23 17:18:29,368 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:29,368 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:29,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:29,595 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2021-11-23 17:18:29,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:29,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:29,974 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:29,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:29,975 INFO L85 PathProgramCache]: Analyzing trace with hash -1551583207, now seen corresponding path program 1 times [2021-11-23 17:18:29,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:29,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [275412402] [2021-11-23 17:18:29,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:29,975 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:29,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:29,976 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:29,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 17:18:30,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:30,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:18:30,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:32,147 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:32,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:32,832 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:32,832 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:32,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [275412402] [2021-11-23 17:18:32,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [275412402] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:32,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2103870999] [2021-11-23 17:18:32,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:32,832 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:32,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:32,833 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:32,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2021-11-23 17:18:32,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:32,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:18:32,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:34,054 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:34,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:34,419 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:34,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2103870999] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:34,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [116114570] [2021-11-23 17:18:34,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:34,421 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:34,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:34,421 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:34,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-23 17:18:34,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:34,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:18:34,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:40,190 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:40,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:44,277 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:18:44,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [116114570] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:44,278 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:44,278 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 12, 12, 27, 26] total 84 [2021-11-23 17:18:44,278 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200259384] [2021-11-23 17:18:44,278 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:44,279 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2021-11-23 17:18:44,279 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:44,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-11-23 17:18:44,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=981, Invalid=5991, Unknown=0, NotChecked=0, Total=6972 [2021-11-23 17:18:44,280 INFO L87 Difference]: Start difference. First operand 713 states and 927 transitions. Second operand has 84 states, 84 states have (on average 4.607142857142857) internal successors, (387), 84 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:46,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:46,558 INFO L93 Difference]: Finished difference Result 1180 states and 1504 transitions. [2021-11-23 17:18:46,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 17:18:46,558 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 4.607142857142857) internal successors, (387), 84 states have internal predecessors, (387), 0 states have call successors, (0), 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 99 [2021-11-23 17:18:46,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:46,559 INFO L225 Difference]: With dead ends: 1180 [2021-11-23 17:18:46,559 INFO L226 Difference]: Without dead ends: 988 [2021-11-23 17:18:46,560 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 504 SyntacticMatches, 2 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3386 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=1116, Invalid=6540, Unknown=0, NotChecked=0, Total=7656 [2021-11-23 17:18:46,561 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 318 mSDsluCounter, 2135 mSDsCounter, 0 mSdLazyCounter, 1037 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 318 SdHoareTripleChecker+Valid, 2253 SdHoareTripleChecker+Invalid, 1170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 1037 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 101 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:46,561 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [318 Valid, 2253 Invalid, 1170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 1037 Invalid, 0 Unknown, 101 Unchecked, 1.4s Time] [2021-11-23 17:18:46,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 988 states. [2021-11-23 17:18:46,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 988 to 685. [2021-11-23 17:18:46,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 685 states, 684 states have (on average 1.3011695906432748) internal successors, (890), 684 states have internal predecessors, (890), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:46,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 685 states to 685 states and 890 transitions. [2021-11-23 17:18:46,595 INFO L78 Accepts]: Start accepts. Automaton has 685 states and 890 transitions. Word has length 99 [2021-11-23 17:18:46,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:46,596 INFO L470 AbstractCegarLoop]: Abstraction has 685 states and 890 transitions. [2021-11-23 17:18:46,596 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 4.607142857142857) internal successors, (387), 84 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:46,596 INFO L276 IsEmpty]: Start isEmpty. Operand 685 states and 890 transitions. [2021-11-23 17:18:46,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 17:18:46,596 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:46,597 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:46,603 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Ended with exit code 0 [2021-11-23 17:18:46,798 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:47,016 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:47,197 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:47,197 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:47,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:47,198 INFO L85 PathProgramCache]: Analyzing trace with hash 1413104519, now seen corresponding path program 1 times [2021-11-23 17:18:47,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:47,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1896247035] [2021-11-23 17:18:47,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:47,198 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:47,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:47,199 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:47,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-23 17:18:47,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:47,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:18:47,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:47,542 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:18:47,542 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:47,814 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:18:47,814 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:18:47,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1896247035] [2021-11-23 17:18:47,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1896247035] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:47,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1924072898] [2021-11-23 17:18:47,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:47,815 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:18:47,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:18:47,817 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:18:47,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-23 17:18:47,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:47,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:18:47,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:48,229 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:18:48,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:48,472 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:18:48,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1924072898] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:48,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1124496475] [2021-11-23 17:18:48,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:48,473 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:18:48,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:18:48,478 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:18:48,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-23 17:18:48,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:48,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:18:48,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:18:48,889 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:18:48,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:18:49,138 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:18:49,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1124496475] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:18:49,138 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:18:49,138 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 6 [2021-11-23 17:18:49,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865628282] [2021-11-23 17:18:49,139 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:18:49,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:18:49,139 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:18:49,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:18:49,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:18:49,145 INFO L87 Difference]: Start difference. First operand 685 states and 890 transitions. Second operand has 6 states, 6 states have (on average 32.333333333333336) internal successors, (194), 6 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:49,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:18:49,303 INFO L93 Difference]: Finished difference Result 2083 states and 2734 transitions. [2021-11-23 17:18:49,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:18:49,304 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 32.333333333333336) internal successors, (194), 6 states have internal predecessors, (194), 0 states have call successors, (0), 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 100 [2021-11-23 17:18:49,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:18:49,306 INFO L225 Difference]: With dead ends: 2083 [2021-11-23 17:18:49,306 INFO L226 Difference]: Without dead ends: 1549 [2021-11-23 17:18:49,307 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 595 GetRequests, 587 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:18:49,308 INFO L933 BasicCegarLoop]: 148 mSDtfsCounter, 219 mSDsluCounter, 363 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 511 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:18:49,308 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [219 Valid, 511 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 19 Invalid, 0 Unknown, 16 Unchecked, 0.0s Time] [2021-11-23 17:18:49,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1549 states. [2021-11-23 17:18:49,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1549 to 1457. [2021-11-23 17:18:49,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1457 states, 1456 states have (on average 1.3001373626373627) internal successors, (1893), 1456 states have internal predecessors, (1893), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:49,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1457 states to 1457 states and 1893 transitions. [2021-11-23 17:18:49,428 INFO L78 Accepts]: Start accepts. Automaton has 1457 states and 1893 transitions. Word has length 100 [2021-11-23 17:18:49,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:18:49,428 INFO L470 AbstractCegarLoop]: Abstraction has 1457 states and 1893 transitions. [2021-11-23 17:18:49,428 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 32.333333333333336) internal successors, (194), 6 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:18:49,429 INFO L276 IsEmpty]: Start isEmpty. Operand 1457 states and 1893 transitions. [2021-11-23 17:18:49,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 17:18:49,429 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:18:49,430 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:18:49,436 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:49,653 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2021-11-23 17:18:49,840 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Forceful destruction successful, exit code 0 [2021-11-23 17:18:50,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:18:50,033 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:18:50,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:18:50,034 INFO L85 PathProgramCache]: Analyzing trace with hash -146485840, now seen corresponding path program 1 times [2021-11-23 17:18:50,034 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:18:50,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [335662153] [2021-11-23 17:18:50,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:18:50,034 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:18:50,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:18:50,035 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:18:50,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 17:18:50,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:18:50,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 17:18:50,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:17,848 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:17,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:19:36,482 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:36,482 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:19:36,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [335662153] [2021-11-23 17:19:36,482 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [335662153] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:19:36,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1193167402] [2021-11-23 17:19:36,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:19:36,482 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:19:36,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:19:36,483 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:19:36,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2021-11-23 17:19:36,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:19:36,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:19:36,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:19:59,572 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:19:59,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:03,942 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:03,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1193167402] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:03,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1467933760] [2021-11-23 17:20:03,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:03,942 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:20:03,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:20:03,944 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:20:03,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 17:20:04,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:04,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:20:04,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:09,612 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:09,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:11,338 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:11,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1467933760] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:11,338 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:20:11,338 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 30, 35, 28, 35, 28] total 88 [2021-11-23 17:20:11,339 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222528657] [2021-11-23 17:20:11,339 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:20:11,339 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2021-11-23 17:20:11,340 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:11,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-11-23 17:20:11,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=886, Invalid=6770, Unknown=0, NotChecked=0, Total=7656 [2021-11-23 17:20:11,341 INFO L87 Difference]: Start difference. First operand 1457 states and 1893 transitions. Second operand has 88 states, 88 states have (on average 2.9318181818181817) internal successors, (258), 88 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:14,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:14,084 INFO L93 Difference]: Finished difference Result 1827 states and 2371 transitions. [2021-11-23 17:20:14,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-23 17:20:14,084 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 2.9318181818181817) internal successors, (258), 88 states have internal predecessors, (258), 0 states have call successors, (0), 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 100 [2021-11-23 17:20:14,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:14,086 INFO L225 Difference]: With dead ends: 1827 [2021-11-23 17:20:14,086 INFO L226 Difference]: Without dead ends: 1511 [2021-11-23 17:20:14,087 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 596 GetRequests, 507 SyntacticMatches, 1 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3126 ImplicationChecksByTransitivity, 60.5s TimeCoverageRelationStatistics Valid=965, Invalid=7045, Unknown=0, NotChecked=0, Total=8010 [2021-11-23 17:20:14,088 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 285 mSDsluCounter, 1833 mSDsCounter, 0 mSdLazyCounter, 731 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 285 SdHoareTripleChecker+Valid, 1910 SdHoareTripleChecker+Invalid, 1041 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 731 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 281 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:14,088 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [285 Valid, 1910 Invalid, 1041 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 731 Invalid, 0 Unknown, 281 Unchecked, 1.1s Time] [2021-11-23 17:20:14,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1511 states. [2021-11-23 17:20:14,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1511 to 1463. [2021-11-23 17:20:14,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1463 states, 1462 states have (on average 1.2995896032831737) internal successors, (1900), 1462 states have internal predecessors, (1900), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:14,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1463 states to 1463 states and 1900 transitions. [2021-11-23 17:20:14,167 INFO L78 Accepts]: Start accepts. Automaton has 1463 states and 1900 transitions. Word has length 100 [2021-11-23 17:20:14,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:14,167 INFO L470 AbstractCegarLoop]: Abstraction has 1463 states and 1900 transitions. [2021-11-23 17:20:14,168 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 2.9318181818181817) internal successors, (258), 88 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:14,168 INFO L276 IsEmpty]: Start isEmpty. Operand 1463 states and 1900 transitions. [2021-11-23 17:20:14,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 17:20:14,169 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:14,169 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:20:14,184 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:14,382 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Ended with exit code 0 [2021-11-23 17:20:14,601 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2021-11-23 17:20:14,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:20:14,781 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:14,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:14,781 INFO L85 PathProgramCache]: Analyzing trace with hash -1556416045, now seen corresponding path program 1 times [2021-11-23 17:20:14,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:14,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [66850344] [2021-11-23 17:20:14,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:14,781 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:14,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:14,782 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:14,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 17:20:14,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:14,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:20:14,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:17,393 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:17,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:18,290 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:18,291 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:18,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [66850344] [2021-11-23 17:20:18,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [66850344] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:18,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1744014667] [2021-11-23 17:20:18,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:18,291 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:18,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:20:18,292 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:20:18,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-23 17:20:18,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:18,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:20:18,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:21,087 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:21,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:21,910 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:21,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1744014667] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:21,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [343367589] [2021-11-23 17:20:21,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:21,910 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:20:21,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:20:21,911 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:20:21,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-23 17:20:21,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:21,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:20:21,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:25,324 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:25,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:26,486 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:26,486 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [343367589] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:26,486 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:20:26,486 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 16, 16, 16, 14] total 65 [2021-11-23 17:20:26,486 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814805572] [2021-11-23 17:20:26,486 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:20:26,487 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-23 17:20:26,487 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:26,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-23 17:20:26,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=399, Invalid=3761, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 17:20:26,488 INFO L87 Difference]: Start difference. First operand 1463 states and 1900 transitions. Second operand has 65 states, 65 states have (on average 6.415384615384616) internal successors, (417), 65 states have internal predecessors, (417), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:28,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:28,268 INFO L93 Difference]: Finished difference Result 2431 states and 3134 transitions. [2021-11-23 17:20:28,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:20:28,268 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 6.415384615384616) internal successors, (417), 65 states have internal predecessors, (417), 0 states have call successors, (0), 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 100 [2021-11-23 17:20:28,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:28,270 INFO L225 Difference]: With dead ends: 2431 [2021-11-23 17:20:28,270 INFO L226 Difference]: Without dead ends: 1995 [2021-11-23 17:20:28,271 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 628 GetRequests, 544 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2374 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=759, Invalid=6551, Unknown=0, NotChecked=0, Total=7310 [2021-11-23 17:20:28,272 INFO L933 BasicCegarLoop]: 128 mSDtfsCounter, 372 mSDsluCounter, 3561 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 372 SdHoareTripleChecker+Valid, 3689 SdHoareTripleChecker+Invalid, 476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 241 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:28,272 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [372 Valid, 3689 Invalid, 476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 227 Invalid, 0 Unknown, 241 Unchecked, 0.2s Time] [2021-11-23 17:20:28,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1995 states. [2021-11-23 17:20:28,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1995 to 1480. [2021-11-23 17:20:28,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1480 states, 1479 states have (on average 1.2988505747126438) internal successors, (1921), 1479 states have internal predecessors, (1921), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:28,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1480 states to 1480 states and 1921 transitions. [2021-11-23 17:20:28,377 INFO L78 Accepts]: Start accepts. Automaton has 1480 states and 1921 transitions. Word has length 100 [2021-11-23 17:20:28,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:28,378 INFO L470 AbstractCegarLoop]: Abstraction has 1480 states and 1921 transitions. [2021-11-23 17:20:28,378 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 6.415384615384616) internal successors, (417), 65 states have internal predecessors, (417), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:28,378 INFO L276 IsEmpty]: Start isEmpty. Operand 1480 states and 1921 transitions. [2021-11-23 17:20:28,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 17:20:28,379 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:28,380 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:20:28,397 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:28,611 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2021-11-23 17:20:28,792 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Ended with exit code 0 [2021-11-23 17:20:28,991 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:28,991 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:28,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:28,992 INFO L85 PathProgramCache]: Analyzing trace with hash 1926035677, now seen corresponding path program 1 times [2021-11-23 17:20:28,992 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:28,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [130981194] [2021-11-23 17:20:28,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:28,992 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:28,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:28,993 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:28,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2021-11-23 17:20:29,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:29,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:20:29,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:30,417 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 17:20:30,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:30,756 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 17:20:30,757 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:30,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [130981194] [2021-11-23 17:20:30,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [130981194] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:30,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [849337888] [2021-11-23 17:20:30,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:30,757 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:30,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:20:30,758 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:20:30,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Waiting until timeout for monitored process [2021-11-23 17:20:30,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:30,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:20:30,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:32,395 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:32,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:32,830 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:32,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [849337888] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:32,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [777932455] [2021-11-23 17:20:32,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:32,830 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:20:32,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:20:32,831 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:20:32,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-23 17:20:32,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:32,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:20:32,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:34,435 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:34,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:34,693 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:34,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [777932455] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:34,693 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:20:34,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 10, 9] total 33 [2021-11-23 17:20:34,694 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041249620] [2021-11-23 17:20:34,694 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:20:34,694 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-23 17:20:34,694 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:34,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-23 17:20:34,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 17:20:34,695 INFO L87 Difference]: Start difference. First operand 1480 states and 1921 transitions. Second operand has 33 states, 33 states have (on average 10.272727272727273) internal successors, (339), 33 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:35,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:35,423 INFO L93 Difference]: Finished difference Result 2320 states and 2983 transitions. [2021-11-23 17:20:35,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:20:35,423 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 10.272727272727273) internal successors, (339), 33 states have internal predecessors, (339), 0 states have call successors, (0), 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 100 [2021-11-23 17:20:35,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:35,425 INFO L225 Difference]: With dead ends: 2320 [2021-11-23 17:20:35,425 INFO L226 Difference]: Without dead ends: 1866 [2021-11-23 17:20:35,425 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 608 GetRequests, 565 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=201, Invalid=1779, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:20:35,426 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 149 mSDsluCounter, 2332 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 2462 SdHoareTripleChecker+Invalid, 352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 143 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:35,426 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 2462 Invalid, 352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 203 Invalid, 0 Unknown, 143 Unchecked, 0.1s Time] [2021-11-23 17:20:35,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1866 states. [2021-11-23 17:20:35,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1866 to 1396. [2021-11-23 17:20:35,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1396 states, 1395 states have (on average 1.2967741935483872) internal successors, (1809), 1395 states have internal predecessors, (1809), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:35,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1396 states to 1396 states and 1809 transitions. [2021-11-23 17:20:35,499 INFO L78 Accepts]: Start accepts. Automaton has 1396 states and 1809 transitions. Word has length 100 [2021-11-23 17:20:35,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:35,499 INFO L470 AbstractCegarLoop]: Abstraction has 1396 states and 1809 transitions. [2021-11-23 17:20:35,499 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 10.272727272727273) internal successors, (339), 33 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:35,499 INFO L276 IsEmpty]: Start isEmpty. Operand 1396 states and 1809 transitions. [2021-11-23 17:20:35,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 17:20:35,500 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:35,500 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:20:35,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:35,728 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2021-11-23 17:20:35,914 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Ended with exit code 0 [2021-11-23 17:20:36,113 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:36,113 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:36,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:36,114 INFO L85 PathProgramCache]: Analyzing trace with hash 1293305395, now seen corresponding path program 1 times [2021-11-23 17:20:36,114 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:36,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1367823998] [2021-11-23 17:20:36,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:36,114 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:36,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:36,116 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:36,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Waiting until timeout for monitored process [2021-11-23 17:20:36,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:36,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:20:36,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:38,879 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:38,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:39,742 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:39,742 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:39,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1367823998] [2021-11-23 17:20:39,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1367823998] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:39,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1369251717] [2021-11-23 17:20:39,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:39,743 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:39,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:20:39,748 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:20:39,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Waiting until timeout for monitored process [2021-11-23 17:20:39,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:39,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:20:39,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:42,490 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:42,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:43,033 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:43,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1369251717] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:43,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [377429996] [2021-11-23 17:20:43,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:43,033 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:20:43,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:20:43,035 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:20:43,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-23 17:20:43,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:43,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 17:20:43,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:45,964 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:45,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:47,451 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:47,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [377429996] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:47,451 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:20:47,451 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 17, 15, 17, 16] total 49 [2021-11-23 17:20:47,451 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819263292] [2021-11-23 17:20:47,451 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:20:47,452 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-23 17:20:47,452 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:47,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-23 17:20:47,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=1986, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 17:20:47,453 INFO L87 Difference]: Start difference. First operand 1396 states and 1809 transitions. Second operand has 49 states, 49 states have (on average 6.204081632653061) internal successors, (304), 49 states have internal predecessors, (304), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:47,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:47,739 INFO L93 Difference]: Finished difference Result 2319 states and 2979 transitions. [2021-11-23 17:20:47,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:20:47,740 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 6.204081632653061) internal successors, (304), 49 states have internal predecessors, (304), 0 states have call successors, (0), 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 100 [2021-11-23 17:20:47,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:47,741 INFO L225 Difference]: With dead ends: 2319 [2021-11-23 17:20:47,742 INFO L226 Difference]: Without dead ends: 1883 [2021-11-23 17:20:47,742 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 595 GetRequests, 547 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 803 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=394, Invalid=2056, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:20:47,743 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 339 mSDsluCounter, 1911 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 339 SdHoareTripleChecker+Valid, 2042 SdHoareTripleChecker+Invalid, 529 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 328 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:47,743 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [339 Valid, 2042 Invalid, 529 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 191 Invalid, 0 Unknown, 328 Unchecked, 0.1s Time] [2021-11-23 17:20:47,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1883 states. [2021-11-23 17:20:47,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1883 to 1402. [2021-11-23 17:20:47,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1402 states, 1401 states have (on average 1.29621698786581) internal successors, (1816), 1401 states have internal predecessors, (1816), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:47,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1402 states to 1402 states and 1816 transitions. [2021-11-23 17:20:47,822 INFO L78 Accepts]: Start accepts. Automaton has 1402 states and 1816 transitions. Word has length 100 [2021-11-23 17:20:47,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:47,822 INFO L470 AbstractCegarLoop]: Abstraction has 1402 states and 1816 transitions. [2021-11-23 17:20:47,822 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 6.204081632653061) internal successors, (304), 49 states have internal predecessors, (304), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:47,822 INFO L276 IsEmpty]: Start isEmpty. Operand 1402 states and 1816 transitions. [2021-11-23 17:20:47,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-23 17:20:47,823 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:47,823 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:20:47,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:48,031 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Ended with exit code 0 [2021-11-23 17:20:48,226 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:48,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:48,425 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:48,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:48,425 INFO L85 PathProgramCache]: Analyzing trace with hash -357380077, now seen corresponding path program 1 times [2021-11-23 17:20:48,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:48,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [414902173] [2021-11-23 17:20:48,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:48,426 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:48,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:48,427 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:48,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2021-11-23 17:20:48,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:48,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:20:48,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:49,663 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:49,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:49,988 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:49,988 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:49,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [414902173] [2021-11-23 17:20:49,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [414902173] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:49,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2096291682] [2021-11-23 17:20:49,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:49,988 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:49,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:20:49,989 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:20:49,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Waiting until timeout for monitored process [2021-11-23 17:20:50,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:50,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:20:50,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:51,644 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:51,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:52,123 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:52,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2096291682] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:52,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1224033171] [2021-11-23 17:20:52,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:52,124 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:20:52,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:20:52,124 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:20:52,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-23 17:20:52,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:52,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:20:52,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:53,812 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:53,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:54,669 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:54,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1224033171] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:54,669 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:20:54,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 12, 10] total 45 [2021-11-23 17:20:54,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138257662] [2021-11-23 17:20:54,670 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:20:54,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-23 17:20:54,671 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:54,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-23 17:20:54,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1818, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:20:54,672 INFO L87 Difference]: Start difference. First operand 1402 states and 1816 transitions. Second operand has 45 states, 45 states have (on average 10.444444444444445) internal successors, (470), 45 states have internal predecessors, (470), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:55,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:55,454 INFO L93 Difference]: Finished difference Result 2169 states and 2788 transitions. [2021-11-23 17:20:55,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:20:55,454 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 10.444444444444445) internal successors, (470), 45 states have internal predecessors, (470), 0 states have call successors, (0), 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 100 [2021-11-23 17:20:55,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:55,456 INFO L225 Difference]: With dead ends: 2169 [2021-11-23 17:20:55,456 INFO L226 Difference]: Without dead ends: 1715 [2021-11-23 17:20:55,457 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 613 GetRequests, 557 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 728 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=315, Invalid=2877, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 17:20:55,457 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 163 mSDsluCounter, 2370 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 2497 SdHoareTripleChecker+Invalid, 351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 259 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:20:55,458 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 2497 Invalid, 351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 86 Invalid, 0 Unknown, 259 Unchecked, 0.1s Time] [2021-11-23 17:20:55,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1715 states. [2021-11-23 17:20:55,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1715 to 1319. [2021-11-23 17:20:55,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1319 states, 1318 states have (on average 1.2966616084977238) internal successors, (1709), 1318 states have internal predecessors, (1709), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:55,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1319 states to 1319 states and 1709 transitions. [2021-11-23 17:20:55,530 INFO L78 Accepts]: Start accepts. Automaton has 1319 states and 1709 transitions. Word has length 100 [2021-11-23 17:20:55,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:55,530 INFO L470 AbstractCegarLoop]: Abstraction has 1319 states and 1709 transitions. [2021-11-23 17:20:55,531 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 10.444444444444445) internal successors, (470), 45 states have internal predecessors, (470), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:55,531 INFO L276 IsEmpty]: Start isEmpty. Operand 1319 states and 1709 transitions. [2021-11-23 17:20:55,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 17:20:55,531 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:55,532 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:20:55,539 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Ended with exit code 0 [2021-11-23 17:20:55,740 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Ended with exit code 0 [2021-11-23 17:20:55,954 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:56,134 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:20:56,134 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:56,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:56,134 INFO L85 PathProgramCache]: Analyzing trace with hash -1133430328, now seen corresponding path program 1 times [2021-11-23 17:20:56,135 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:56,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [709767097] [2021-11-23 17:20:56,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:56,135 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:56,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:56,136 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:56,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Waiting until timeout for monitored process [2021-11-23 17:20:56,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:56,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:20:56,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:56,478 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:20:56,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:56,680 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:20:56,681 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:56,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [709767097] [2021-11-23 17:20:56,681 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [709767097] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:56,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2061719515] [2021-11-23 17:20:56,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:56,681 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:56,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:20:56,682 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:20:56,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Waiting until timeout for monitored process [2021-11-23 17:20:56,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:56,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:20:56,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:56,911 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:20:56,911 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:20:56,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2061719515] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:20:56,911 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:20:56,911 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 17:20:56,911 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097726178] [2021-11-23 17:20:56,911 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:20:56,911 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:20:56,912 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:20:56,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:20:56,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:20:56,912 INFO L87 Difference]: Start difference. First operand 1319 states and 1709 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:57,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:20:57,035 INFO L93 Difference]: Finished difference Result 2366 states and 3087 transitions. [2021-11-23 17:20:57,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:20:57,035 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 0 states have call successors, (0), 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 101 [2021-11-23 17:20:57,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:20:57,037 INFO L225 Difference]: With dead ends: 2366 [2021-11-23 17:20:57,037 INFO L226 Difference]: Without dead ends: 1348 [2021-11-23 17:20:57,039 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 295 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:20:57,039 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 70 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 192 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 17:20:57,040 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 192 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:20:57,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1348 states. [2021-11-23 17:20:57,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1348 to 1218. [2021-11-23 17:20:57,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1218 states, 1217 states have (on average 1.2941659819227609) internal successors, (1575), 1217 states have internal predecessors, (1575), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:57,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1218 states to 1218 states and 1575 transitions. [2021-11-23 17:20:57,130 INFO L78 Accepts]: Start accepts. Automaton has 1218 states and 1575 transitions. Word has length 101 [2021-11-23 17:20:57,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:20:57,131 INFO L470 AbstractCegarLoop]: Abstraction has 1218 states and 1575 transitions. [2021-11-23 17:20:57,131 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:20:57,131 INFO L276 IsEmpty]: Start isEmpty. Operand 1218 states and 1575 transitions. [2021-11-23 17:20:57,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 17:20:57,131 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:20:57,132 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:20:57,143 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Forceful destruction successful, exit code 0 [2021-11-23 17:20:57,338 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Ended with exit code 0 [2021-11-23 17:20:57,538 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:57,538 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:20:57,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:20:57,538 INFO L85 PathProgramCache]: Analyzing trace with hash -1617310996, now seen corresponding path program 1 times [2021-11-23 17:20:57,539 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:20:57,539 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1632836429] [2021-11-23 17:20:57,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:57,539 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:20:57,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:20:57,540 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:20:57,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Waiting until timeout for monitored process [2021-11-23 17:20:57,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:57,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:20:57,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:20:58,922 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:58,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:20:59,284 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:20:59,285 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:20:59,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1632836429] [2021-11-23 17:20:59,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1632836429] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:20:59,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1624810100] [2021-11-23 17:20:59,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:20:59,286 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:20:59,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:20:59,291 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:20:59,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (75)] Waiting until timeout for monitored process [2021-11-23 17:20:59,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:20:59,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:20:59,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:00,733 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:00,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:00,966 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:00,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1624810100] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:00,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1550811558] [2021-11-23 17:21:00,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:00,967 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:00,967 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:21:00,973 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:21:00,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-23 17:21:01,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:01,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:21:01,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:05,126 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:05,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:06,348 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:06,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1550811558] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:06,349 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:21:06,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 19, 16] total 47 [2021-11-23 17:21:06,349 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293603587] [2021-11-23 17:21:06,349 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:21:06,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-23 17:21:06,350 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:06,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-23 17:21:06,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=272, Invalid=1890, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 17:21:06,350 INFO L87 Difference]: Start difference. First operand 1218 states and 1575 transitions. Second operand has 47 states, 47 states have (on average 6.851063829787234) internal successors, (322), 47 states have internal predecessors, (322), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:06,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:06,680 INFO L93 Difference]: Finished difference Result 1583 states and 2065 transitions. [2021-11-23 17:21:06,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 17:21:06,680 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 6.851063829787234) internal successors, (322), 47 states have internal predecessors, (322), 0 states have call successors, (0), 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 101 [2021-11-23 17:21:06,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:06,682 INFO L225 Difference]: With dead ends: 1583 [2021-11-23 17:21:06,682 INFO L226 Difference]: Without dead ends: 1272 [2021-11-23 17:21:06,682 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 602 GetRequests, 555 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 755 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=315, Invalid=2037, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 17:21:06,683 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 296 mSDsluCounter, 1642 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 1744 SdHoareTripleChecker+Invalid, 313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 121 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:06,683 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [296 Valid, 1744 Invalid, 313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 180 Invalid, 0 Unknown, 121 Unchecked, 0.1s Time] [2021-11-23 17:21:06,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1272 states. [2021-11-23 17:21:06,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1272 to 1214. [2021-11-23 17:21:06,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1214 states, 1213 states have (on average 1.2943116240725474) internal successors, (1570), 1213 states have internal predecessors, (1570), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:06,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1214 states to 1214 states and 1570 transitions. [2021-11-23 17:21:06,755 INFO L78 Accepts]: Start accepts. Automaton has 1214 states and 1570 transitions. Word has length 101 [2021-11-23 17:21:06,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:06,755 INFO L470 AbstractCegarLoop]: Abstraction has 1214 states and 1570 transitions. [2021-11-23 17:21:06,755 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 6.851063829787234) internal successors, (322), 47 states have internal predecessors, (322), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:06,755 INFO L276 IsEmpty]: Start isEmpty. Operand 1214 states and 1570 transitions. [2021-11-23 17:21:06,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 17:21:06,756 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:06,756 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:21:06,758 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (75)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:06,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:07,163 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Ended with exit code 0 [2021-11-23 17:21:07,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:21:07,357 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:07,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:07,357 INFO L85 PathProgramCache]: Analyzing trace with hash -1365412589, now seen corresponding path program 1 times [2021-11-23 17:21:07,357 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:07,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [72330984] [2021-11-23 17:21:07,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:07,358 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:07,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:07,359 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:07,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (77)] Waiting until timeout for monitored process [2021-11-23 17:21:07,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:07,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:21:07,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:08,756 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:08,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:09,099 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:09,099 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:09,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [72330984] [2021-11-23 17:21:09,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [72330984] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:09,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1867517644] [2021-11-23 17:21:09,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:09,100 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:09,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:09,105 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:09,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (78)] Waiting until timeout for monitored process [2021-11-23 17:21:09,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:09,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:21:09,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:10,921 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:10,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:11,200 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:11,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1867517644] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:11,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1650660054] [2021-11-23 17:21:11,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:11,200 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:11,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:21:11,201 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:21:11,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2021-11-23 17:21:11,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:11,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:21:11,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:12,651 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:12,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:13,368 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:13,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1650660054] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:13,368 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:21:13,369 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 12, 10] total 30 [2021-11-23 17:21:13,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466862196] [2021-11-23 17:21:13,369 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:21:13,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 17:21:13,370 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:13,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 17:21:13,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:21:13,370 INFO L87 Difference]: Start difference. First operand 1214 states and 1570 transitions. Second operand has 30 states, 30 states have (on average 10.266666666666667) internal successors, (308), 30 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:13,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:13,491 INFO L93 Difference]: Finished difference Result 1537 states and 2000 transitions. [2021-11-23 17:21:13,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:21:13,492 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 10.266666666666667) internal successors, (308), 30 states have internal predecessors, (308), 0 states have call successors, (0), 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 101 [2021-11-23 17:21:13,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:13,493 INFO L225 Difference]: With dead ends: 1537 [2021-11-23 17:21:13,493 INFO L226 Difference]: Without dead ends: 1226 [2021-11-23 17:21:13,494 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 571 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=135, Invalid=795, Unknown=0, NotChecked=0, Total=930 [2021-11-23 17:21:13,494 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 179 mSDsluCounter, 1780 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 1885 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 171 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:13,494 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [179 Valid, 1885 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 44 Invalid, 0 Unknown, 171 Unchecked, 0.0s Time] [2021-11-23 17:21:13,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1226 states. [2021-11-23 17:21:13,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1226 to 1214. [2021-11-23 17:21:13,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1214 states, 1213 states have (on average 1.2943116240725474) internal successors, (1570), 1213 states have internal predecessors, (1570), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:13,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1214 states to 1214 states and 1570 transitions. [2021-11-23 17:21:13,564 INFO L78 Accepts]: Start accepts. Automaton has 1214 states and 1570 transitions. Word has length 101 [2021-11-23 17:21:13,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:13,565 INFO L470 AbstractCegarLoop]: Abstraction has 1214 states and 1570 transitions. [2021-11-23 17:21:13,565 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 10.266666666666667) internal successors, (308), 30 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:13,565 INFO L276 IsEmpty]: Start isEmpty. Operand 1214 states and 1570 transitions. [2021-11-23 17:21:13,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 17:21:13,566 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:13,566 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:21:13,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:13,770 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (78)] Ended with exit code 0 [2021-11-23 17:21:13,975 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (77)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:14,169 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:21:14,169 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:14,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:14,169 INFO L85 PathProgramCache]: Analyzing trace with hash 1519624502, now seen corresponding path program 1 times [2021-11-23 17:21:14,170 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:14,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2076994244] [2021-11-23 17:21:14,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:14,170 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:14,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:14,170 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:14,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (80)] Waiting until timeout for monitored process [2021-11-23 17:21:14,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:14,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:21:14,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:17,009 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:17,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:18,044 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:18,044 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:18,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2076994244] [2021-11-23 17:21:18,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2076994244] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:18,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [796874709] [2021-11-23 17:21:18,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:18,044 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:18,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:18,045 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:18,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (81)] Waiting until timeout for monitored process [2021-11-23 17:21:18,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:18,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:21:18,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:19,906 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:19,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:20,322 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:20,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [796874709] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:20,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [572176187] [2021-11-23 17:21:20,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:20,323 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:20,323 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:21:20,324 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:21:20,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-23 17:21:20,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:20,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:21:20,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:26,667 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:26,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:28,842 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:28,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [572176187] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:28,842 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:21:28,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 11, 9, 24, 21] total 80 [2021-11-23 17:21:28,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789658501] [2021-11-23 17:21:28,843 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:21:28,843 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-23 17:21:28,843 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:28,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-23 17:21:28,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=5419, Unknown=0, NotChecked=0, Total=6320 [2021-11-23 17:21:28,845 INFO L87 Difference]: Start difference. First operand 1214 states and 1570 transitions. Second operand has 80 states, 80 states have (on average 5.9875) internal successors, (479), 80 states have internal predecessors, (479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:29,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:29,388 INFO L93 Difference]: Finished difference Result 1510 states and 1952 transitions. [2021-11-23 17:21:29,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:21:29,389 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 5.9875) internal successors, (479), 80 states have internal predecessors, (479), 0 states have call successors, (0), 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 101 [2021-11-23 17:21:29,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:29,390 INFO L225 Difference]: With dead ends: 1510 [2021-11-23 17:21:29,390 INFO L226 Difference]: Without dead ends: 1143 [2021-11-23 17:21:29,391 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 522 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2913 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=932, Invalid=5548, Unknown=0, NotChecked=0, Total=6480 [2021-11-23 17:21:29,392 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 361 mSDsluCounter, 2232 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 361 SdHoareTripleChecker+Valid, 2331 SdHoareTripleChecker+Invalid, 656 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 149 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:29,392 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [361 Valid, 2331 Invalid, 656 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 496 Invalid, 0 Unknown, 149 Unchecked, 0.4s Time] [2021-11-23 17:21:29,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1143 states. [2021-11-23 17:21:29,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1143 to 1092. [2021-11-23 17:21:29,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1092 states, 1091 states have (on average 1.2933088909257562) internal successors, (1411), 1091 states have internal predecessors, (1411), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:29,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1092 states to 1092 states and 1411 transitions. [2021-11-23 17:21:29,453 INFO L78 Accepts]: Start accepts. Automaton has 1092 states and 1411 transitions. Word has length 101 [2021-11-23 17:21:29,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:29,454 INFO L470 AbstractCegarLoop]: Abstraction has 1092 states and 1411 transitions. [2021-11-23 17:21:29,454 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 5.9875) internal successors, (479), 80 states have internal predecessors, (479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:29,454 INFO L276 IsEmpty]: Start isEmpty. Operand 1092 states and 1411 transitions. [2021-11-23 17:21:29,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 17:21:29,454 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:29,455 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:21:29,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (81)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:29,675 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Ended with exit code 0 [2021-11-23 17:21:29,862 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (80)] Ended with exit code 0 [2021-11-23 17:21:30,055 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:21:30,055 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:30,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:30,056 INFO L85 PathProgramCache]: Analyzing trace with hash -749334551, now seen corresponding path program 1 times [2021-11-23 17:21:30,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:30,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [945352170] [2021-11-23 17:21:30,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:30,057 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:30,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:30,058 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:30,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Waiting until timeout for monitored process [2021-11-23 17:21:30,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:30,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:21:30,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:32,187 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:32,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:33,020 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:33,020 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:33,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [945352170] [2021-11-23 17:21:33,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [945352170] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:33,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1459613465] [2021-11-23 17:21:33,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:33,021 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:33,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:33,021 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:33,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Waiting until timeout for monitored process [2021-11-23 17:21:33,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:33,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:21:33,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:37,286 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:37,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:38,677 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:38,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1459613465] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:38,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [173112581] [2021-11-23 17:21:38,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:38,678 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:38,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:21:38,679 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:21:38,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-23 17:21:38,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:38,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 17:21:38,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:49,463 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:49,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:52,460 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:52,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [173112581] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:52,460 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:21:52,461 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 19, 15, 27, 22] total 96 [2021-11-23 17:21:52,461 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691101598] [2021-11-23 17:21:52,461 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:21:52,461 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2021-11-23 17:21:52,462 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:21:52,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-11-23 17:21:52,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=960, Invalid=8160, Unknown=0, NotChecked=0, Total=9120 [2021-11-23 17:21:52,463 INFO L87 Difference]: Start difference. First operand 1092 states and 1411 transitions. Second operand has 96 states, 96 states have (on average 4.979166666666667) internal successors, (478), 96 states have internal predecessors, (478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:53,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:21:53,488 INFO L93 Difference]: Finished difference Result 1337 states and 1736 transitions. [2021-11-23 17:21:53,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 17:21:53,489 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 96 states have (on average 4.979166666666667) internal successors, (478), 96 states have internal predecessors, (478), 0 states have call successors, (0), 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 102 [2021-11-23 17:21:53,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:21:53,490 INFO L225 Difference]: With dead ends: 1337 [2021-11-23 17:21:53,490 INFO L226 Difference]: Without dead ends: 1026 [2021-11-23 17:21:53,491 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 608 GetRequests, 512 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4043 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=1012, Invalid=8494, Unknown=0, NotChecked=0, Total=9506 [2021-11-23 17:21:53,492 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 300 mSDsluCounter, 3472 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 3587 SdHoareTripleChecker+Invalid, 980 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 488 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:21:53,492 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [300 Valid, 3587 Invalid, 980 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 480 Invalid, 0 Unknown, 488 Unchecked, 0.5s Time] [2021-11-23 17:21:53,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1026 states. [2021-11-23 17:21:53,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1026 to 996. [2021-11-23 17:21:53,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 996 states, 995 states have (on average 1.2914572864321607) internal successors, (1285), 995 states have internal predecessors, (1285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:53,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 996 states to 996 states and 1285 transitions. [2021-11-23 17:21:53,563 INFO L78 Accepts]: Start accepts. Automaton has 996 states and 1285 transitions. Word has length 102 [2021-11-23 17:21:53,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:21:53,563 INFO L470 AbstractCegarLoop]: Abstraction has 996 states and 1285 transitions. [2021-11-23 17:21:53,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 96 states have (on average 4.979166666666667) internal successors, (478), 96 states have internal predecessors, (478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:21:53,564 INFO L276 IsEmpty]: Start isEmpty. Operand 996 states and 1285 transitions. [2021-11-23 17:21:53,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 17:21:53,565 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:21:53,565 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:21:53,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Forceful destruction successful, exit code 0 [2021-11-23 17:21:53,788 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Ended with exit code 0 [2021-11-23 17:21:53,974 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Ended with exit code 0 [2021-11-23 17:21:54,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:21:54,168 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:21:54,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:21:54,168 INFO L85 PathProgramCache]: Analyzing trace with hash 322394477, now seen corresponding path program 1 times [2021-11-23 17:21:54,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:21:54,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [498659147] [2021-11-23 17:21:54,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:54,169 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:21:54,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:21:54,170 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:21:54,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Waiting until timeout for monitored process [2021-11-23 17:21:54,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:54,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:21:54,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:56,176 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:56,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:56,888 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:56,888 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:21:56,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [498659147] [2021-11-23 17:21:56,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [498659147] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:56,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1004511033] [2021-11-23 17:21:56,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:56,888 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:21:56,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:21:56,889 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:21:56,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Waiting until timeout for monitored process [2021-11-23 17:21:57,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:57,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:21:57,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:21:58,941 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:58,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:21:59,506 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:21:59,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1004511033] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:21:59,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1858330011] [2021-11-23 17:21:59,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:21:59,507 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:21:59,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:21:59,507 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:21:59,508 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-23 17:21:59,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:21:59,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:21:59,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:01,117 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 64 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:22:01,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:02,034 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 64 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:22:02,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1858330011] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:02,034 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:02,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:22:02,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460163672] [2021-11-23 17:22:02,034 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:02,035 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:22:02,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:02,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:22:02,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:22:02,036 INFO L87 Difference]: Start difference. First operand 996 states and 1285 transitions. Second operand has 34 states, 34 states have (on average 14.352941176470589) internal successors, (488), 33 states have internal predecessors, (488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:02,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:02,470 INFO L93 Difference]: Finished difference Result 1861 states and 2417 transitions. [2021-11-23 17:22:02,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:22:02,470 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 14.352941176470589) internal successors, (488), 33 states have internal predecessors, (488), 0 states have call successors, (0), 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 159 [2021-11-23 17:22:02,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:02,472 INFO L225 Difference]: With dead ends: 1861 [2021-11-23 17:22:02,472 INFO L226 Difference]: Without dead ends: 1038 [2021-11-23 17:22:02,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 962 GetRequests, 920 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=248, Invalid=1644, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:22:02,473 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 268 mSDsluCounter, 1709 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 1817 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 124 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:02,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [268 Valid, 1817 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 68 Invalid, 0 Unknown, 124 Unchecked, 0.0s Time] [2021-11-23 17:22:02,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1038 states. [2021-11-23 17:22:02,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1038 to 1038. [2021-11-23 17:22:02,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1038 states, 1037 states have (on average 1.2844744455159114) internal successors, (1332), 1037 states have internal predecessors, (1332), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:02,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1038 states to 1038 states and 1332 transitions. [2021-11-23 17:22:02,532 INFO L78 Accepts]: Start accepts. Automaton has 1038 states and 1332 transitions. Word has length 159 [2021-11-23 17:22:02,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:02,532 INFO L470 AbstractCegarLoop]: Abstraction has 1038 states and 1332 transitions. [2021-11-23 17:22:02,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 14.352941176470589) internal successors, (488), 33 states have internal predecessors, (488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:02,532 INFO L276 IsEmpty]: Start isEmpty. Operand 1038 states and 1332 transitions. [2021-11-23 17:22:02,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 17:22:02,533 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:02,534 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:22:02,577 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:02,764 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:02,959 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Ended with exit code 0 [2021-11-23 17:22:03,157 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:03,157 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:03,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:03,158 INFO L85 PathProgramCache]: Analyzing trace with hash 566028781, now seen corresponding path program 1 times [2021-11-23 17:22:03,158 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:03,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [863094062] [2021-11-23 17:22:03,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:03,159 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:03,159 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:03,160 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:03,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Waiting until timeout for monitored process [2021-11-23 17:22:03,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:03,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:22:03,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:05,244 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 46 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:05,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:05,993 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 46 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:05,993 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:05,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [863094062] [2021-11-23 17:22:05,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [863094062] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:05,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [171640845] [2021-11-23 17:22:05,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:05,993 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:05,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:05,994 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:05,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Waiting until timeout for monitored process [2021-11-23 17:22:06,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:06,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:22:06,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:08,094 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 46 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:08,094 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:08,647 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 46 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:08,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [171640845] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:08,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [184959483] [2021-11-23 17:22:08,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:08,647 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:08,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:08,648 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:08,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-23 17:22:08,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:08,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:22:08,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:10,638 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 46 proven. 81 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:22:10,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:11,317 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 46 proven. 81 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:22:11,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [184959483] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:11,317 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:11,317 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:22:11,317 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765437864] [2021-11-23 17:22:11,317 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:11,318 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:22:11,318 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:11,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:22:11,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:22:11,319 INFO L87 Difference]: Start difference. First operand 1038 states and 1332 transitions. Second operand has 34 states, 34 states have (on average 14.705882352941176) internal successors, (500), 33 states have internal predecessors, (500), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:11,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:11,779 INFO L93 Difference]: Finished difference Result 1973 states and 2544 transitions. [2021-11-23 17:22:11,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:22:11,779 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 14.705882352941176) internal successors, (500), 33 states have internal predecessors, (500), 0 states have call successors, (0), 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 159 [2021-11-23 17:22:11,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:11,781 INFO L225 Difference]: With dead ends: 1973 [2021-11-23 17:22:11,781 INFO L226 Difference]: Without dead ends: 1156 [2021-11-23 17:22:11,782 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 961 GetRequests, 918 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 455 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=258, Invalid=1722, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:22:11,782 INFO L933 BasicCegarLoop]: 112 mSDtfsCounter, 149 mSDsluCounter, 2024 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 2136 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 173 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:11,782 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 2136 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 92 Invalid, 0 Unknown, 173 Unchecked, 0.1s Time] [2021-11-23 17:22:11,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1156 states. [2021-11-23 17:22:11,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1156 to 1156. [2021-11-23 17:22:11,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1156 states, 1155 states have (on average 1.2701298701298702) internal successors, (1467), 1155 states have internal predecessors, (1467), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:11,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1156 states to 1156 states and 1467 transitions. [2021-11-23 17:22:11,850 INFO L78 Accepts]: Start accepts. Automaton has 1156 states and 1467 transitions. Word has length 159 [2021-11-23 17:22:11,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:11,850 INFO L470 AbstractCegarLoop]: Abstraction has 1156 states and 1467 transitions. [2021-11-23 17:22:11,850 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 14.705882352941176) internal successors, (500), 33 states have internal predecessors, (500), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:11,850 INFO L276 IsEmpty]: Start isEmpty. Operand 1156 states and 1467 transitions. [2021-11-23 17:22:11,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 17:22:11,852 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:11,852 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:22:11,862 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:12,055 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:12,273 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:12,453 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:12,454 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:12,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:12,454 INFO L85 PathProgramCache]: Analyzing trace with hash -1559763489, now seen corresponding path program 1 times [2021-11-23 17:22:12,454 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:12,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [414993534] [2021-11-23 17:22:12,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:12,455 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:12,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:12,455 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:12,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Waiting until timeout for monitored process [2021-11-23 17:22:12,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:12,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:22:12,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:14,891 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 32 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:14,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:15,414 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 32 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:15,414 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:15,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [414993534] [2021-11-23 17:22:15,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [414993534] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:15,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1928322614] [2021-11-23 17:22:15,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:15,414 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:15,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:15,415 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:15,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Waiting until timeout for monitored process [2021-11-23 17:22:15,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:15,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:22:15,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:17,970 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 32 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:17,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:18,318 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 32 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:18,319 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1928322614] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:18,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1947477566] [2021-11-23 17:22:18,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:18,319 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:18,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:18,320 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:18,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2021-11-23 17:22:18,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:18,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:22:18,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:20,396 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 32 proven. 88 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:22:20,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:21,146 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 32 proven. 88 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:22:21,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1947477566] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:21,146 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:21,147 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:22:21,147 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322817812] [2021-11-23 17:22:21,147 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:21,147 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:22:21,147 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:21,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:22:21,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:22:21,148 INFO L87 Difference]: Start difference. First operand 1156 states and 1467 transitions. Second operand has 34 states, 34 states have (on average 15.147058823529411) internal successors, (515), 33 states have internal predecessors, (515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:21,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:21,569 INFO L93 Difference]: Finished difference Result 2205 states and 2810 transitions. [2021-11-23 17:22:21,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 17:22:21,569 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 15.147058823529411) internal successors, (515), 33 states have internal predecessors, (515), 0 states have call successors, (0), 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 159 [2021-11-23 17:22:21,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:21,571 INFO L225 Difference]: With dead ends: 2205 [2021-11-23 17:22:21,571 INFO L226 Difference]: Without dead ends: 1400 [2021-11-23 17:22:21,572 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 960 GetRequests, 919 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=237, Invalid=1569, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 17:22:21,572 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 216 mSDsluCounter, 1978 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 2093 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 160 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:21,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [216 Valid, 2093 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 52 Invalid, 0 Unknown, 160 Unchecked, 0.0s Time] [2021-11-23 17:22:21,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1400 states. [2021-11-23 17:22:21,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1400 to 1400. [2021-11-23 17:22:21,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1400 states, 1399 states have (on average 1.2501786990707648) internal successors, (1749), 1399 states have internal predecessors, (1749), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:21,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1400 states to 1400 states and 1749 transitions. [2021-11-23 17:22:21,659 INFO L78 Accepts]: Start accepts. Automaton has 1400 states and 1749 transitions. Word has length 159 [2021-11-23 17:22:21,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:21,659 INFO L470 AbstractCegarLoop]: Abstraction has 1400 states and 1749 transitions. [2021-11-23 17:22:21,659 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 15.147058823529411) internal successors, (515), 33 states have internal predecessors, (515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:21,659 INFO L276 IsEmpty]: Start isEmpty. Operand 1400 states and 1749 transitions. [2021-11-23 17:22:21,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 17:22:21,661 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:21,661 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-23 17:22:21,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:21,870 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Ended with exit code 0 [2021-11-23 17:22:22,084 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Ended with exit code 0 [2021-11-23 17:22:22,264 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:22,264 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:22,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:22,264 INFO L85 PathProgramCache]: Analyzing trace with hash 746041199, now seen corresponding path program 1 times [2021-11-23 17:22:22,265 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:22,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [274424823] [2021-11-23 17:22:22,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:22,265 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:22,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:22,266 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:22,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Waiting until timeout for monitored process [2021-11-23 17:22:22,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:22,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:22:22,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:24,062 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 74 proven. 48 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:22:24,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:24,738 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 74 proven. 48 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:22:24,738 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:24,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [274424823] [2021-11-23 17:22:24,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [274424823] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:24,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [549368576] [2021-11-23 17:22:24,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:24,738 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:24,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:24,739 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:24,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Waiting until timeout for monitored process [2021-11-23 17:22:24,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:24,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:22:24,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:27,726 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 47 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:27,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:28,553 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 47 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:28,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [549368576] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:28,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1907295898] [2021-11-23 17:22:28,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:28,554 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:28,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:28,555 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:28,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2021-11-23 17:22:28,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:28,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:22:28,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:30,914 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 47 proven. 80 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:22:30,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:31,620 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 47 proven. 80 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:22:31,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1907295898] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:31,621 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:31,621 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:22:31,621 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624798191] [2021-11-23 17:22:31,621 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:31,622 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:22:31,622 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:31,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:22:31,622 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:22:31,623 INFO L87 Difference]: Start difference. First operand 1400 states and 1749 transitions. Second operand has 48 states, 48 states have (on average 14.916666666666666) internal successors, (716), 47 states have internal predecessors, (716), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:33,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:33,079 INFO L93 Difference]: Finished difference Result 2589 states and 3296 transitions. [2021-11-23 17:22:33,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 17:22:33,080 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 14.916666666666666) internal successors, (716), 47 states have internal predecessors, (716), 0 states have call successors, (0), 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 159 [2021-11-23 17:22:33,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:33,082 INFO L225 Difference]: With dead ends: 2589 [2021-11-23 17:22:33,082 INFO L226 Difference]: Without dead ends: 1717 [2021-11-23 17:22:33,083 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 977 GetRequests, 908 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1121 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=453, Invalid=4103, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 17:22:33,084 INFO L933 BasicCegarLoop]: 116 mSDtfsCounter, 458 mSDsluCounter, 2913 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 458 SdHoareTripleChecker+Valid, 3029 SdHoareTripleChecker+Invalid, 407 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 288 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:33,084 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [458 Valid, 3029 Invalid, 407 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 111 Invalid, 0 Unknown, 288 Unchecked, 0.1s Time] [2021-11-23 17:22:33,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1717 states. [2021-11-23 17:22:33,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1717 to 1713. [2021-11-23 17:22:33,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1713 states, 1712 states have (on average 1.2476635514018692) internal successors, (2136), 1712 states have internal predecessors, (2136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:33,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1713 states to 1713 states and 2136 transitions. [2021-11-23 17:22:33,196 INFO L78 Accepts]: Start accepts. Automaton has 1713 states and 2136 transitions. Word has length 159 [2021-11-23 17:22:33,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:33,196 INFO L470 AbstractCegarLoop]: Abstraction has 1713 states and 2136 transitions. [2021-11-23 17:22:33,196 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 14.916666666666666) internal successors, (716), 47 states have internal predecessors, (716), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:33,197 INFO L276 IsEmpty]: Start isEmpty. Operand 1713 states and 2136 transitions. [2021-11-23 17:22:33,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 17:22:33,198 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:33,198 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-23 17:22:33,205 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:33,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:33,619 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Ended with exit code 0 [2021-11-23 17:22:33,799 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:33,799 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:33,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:33,799 INFO L85 PathProgramCache]: Analyzing trace with hash 1215880815, now seen corresponding path program 1 times [2021-11-23 17:22:33,799 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:33,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1570162694] [2021-11-23 17:22:33,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:33,800 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:33,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:33,802 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:33,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Waiting until timeout for monitored process [2021-11-23 17:22:33,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:33,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:22:33,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:35,600 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 42 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:22:35,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:36,227 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 42 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:22:36,227 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:36,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1570162694] [2021-11-23 17:22:36,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1570162694] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:36,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1392253207] [2021-11-23 17:22:36,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:36,227 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:36,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:36,228 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:36,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Waiting until timeout for monitored process [2021-11-23 17:22:36,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:36,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:22:36,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:39,187 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:39,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:39,992 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:39,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1392253207] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:39,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [963620846] [2021-11-23 17:22:39,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:39,993 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:39,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:39,994 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:39,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2021-11-23 17:22:40,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:40,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:22:40,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:41,935 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 64 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:22:41,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:42,897 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 64 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:22:42,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [963620846] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:42,897 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:42,898 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:22:42,898 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845374642] [2021-11-23 17:22:42,898 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:42,898 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:22:42,899 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:42,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:22:42,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:22:42,900 INFO L87 Difference]: Start difference. First operand 1713 states and 2136 transitions. Second operand has 48 states, 48 states have (on average 14.729166666666666) internal successors, (707), 47 states have internal predecessors, (707), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:44,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:44,070 INFO L93 Difference]: Finished difference Result 3302 states and 4166 transitions. [2021-11-23 17:22:44,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:22:44,071 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 14.729166666666666) internal successors, (707), 47 states have internal predecessors, (707), 0 states have call successors, (0), 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 159 [2021-11-23 17:22:44,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:44,073 INFO L225 Difference]: With dead ends: 3302 [2021-11-23 17:22:44,073 INFO L226 Difference]: Without dead ends: 2426 [2021-11-23 17:22:44,074 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 975 GetRequests, 909 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=390, Invalid=3770, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 17:22:44,075 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 393 mSDsluCounter, 3263 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 393 SdHoareTripleChecker+Valid, 3378 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 188 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:44,075 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [393 Valid, 3378 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 67 Invalid, 0 Unknown, 188 Unchecked, 0.1s Time] [2021-11-23 17:22:44,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2426 states. [2021-11-23 17:22:44,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2426 to 2422. [2021-11-23 17:22:44,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2422 states, 2421 states have (on average 1.2387443205287072) internal successors, (2999), 2421 states have internal predecessors, (2999), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:44,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2422 states to 2422 states and 2999 transitions. [2021-11-23 17:22:44,250 INFO L78 Accepts]: Start accepts. Automaton has 2422 states and 2999 transitions. Word has length 159 [2021-11-23 17:22:44,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:44,250 INFO L470 AbstractCegarLoop]: Abstraction has 2422 states and 2999 transitions. [2021-11-23 17:22:44,250 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 14.729166666666666) internal successors, (707), 47 states have internal predecessors, (707), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:44,251 INFO L276 IsEmpty]: Start isEmpty. Operand 2422 states and 2999 transitions. [2021-11-23 17:22:44,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 17:22:44,252 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:44,252 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-23 17:22:44,257 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:44,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:44,660 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Ended with exit code 0 [2021-11-23 17:22:44,853 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:44,853 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:44,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:44,854 INFO L85 PathProgramCache]: Analyzing trace with hash 306875759, now seen corresponding path program 1 times [2021-11-23 17:22:44,854 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:44,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2094526956] [2021-11-23 17:22:44,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:44,854 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:44,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:44,855 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:44,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Waiting until timeout for monitored process [2021-11-23 17:22:44,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:44,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:22:44,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:46,731 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 82 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:22:46,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:47,306 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 82 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:22:47,306 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:47,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2094526956] [2021-11-23 17:22:47,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2094526956] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:47,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1183863121] [2021-11-23 17:22:47,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:47,307 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:47,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:47,308 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:47,309 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Waiting until timeout for monitored process [2021-11-23 17:22:47,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:47,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:22:47,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:49,836 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:49,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:50,636 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:50,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1183863121] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:50,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1853803301] [2021-11-23 17:22:50,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:50,636 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:50,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:50,637 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:50,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2021-11-23 17:22:50,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:50,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:22:50,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:52,566 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 64 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:22:52,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:53,529 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 64 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:22:53,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1853803301] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:53,529 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:53,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 49 [2021-11-23 17:22:53,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779140083] [2021-11-23 17:22:53,530 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:53,530 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-23 17:22:53,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:53,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-23 17:22:53,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=2242, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:22:53,531 INFO L87 Difference]: Start difference. First operand 2422 states and 2999 transitions. Second operand has 50 states, 50 states have (on average 14.2) internal successors, (710), 49 states have internal predecessors, (710), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:54,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:54,915 INFO L93 Difference]: Finished difference Result 3534 states and 4428 transitions. [2021-11-23 17:22:54,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:22:54,916 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 14.2) internal successors, (710), 49 states have internal predecessors, (710), 0 states have call successors, (0), 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 159 [2021-11-23 17:22:54,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:54,918 INFO L225 Difference]: With dead ends: 3534 [2021-11-23 17:22:54,918 INFO L226 Difference]: Without dead ends: 2654 [2021-11-23 17:22:54,919 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 974 GetRequests, 908 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1099 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=408, Invalid=4014, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 17:22:54,920 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 193 mSDsluCounter, 2181 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 2276 SdHoareTripleChecker+Invalid, 346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 208 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:54,920 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [193 Valid, 2276 Invalid, 346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 130 Invalid, 0 Unknown, 208 Unchecked, 0.1s Time] [2021-11-23 17:22:54,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2654 states. [2021-11-23 17:22:55,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2654 to 2654. [2021-11-23 17:22:55,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2654 states, 2653 states have (on average 1.2284206558612891) internal successors, (3259), 2653 states have internal predecessors, (3259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:55,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2654 states to 2654 states and 3259 transitions. [2021-11-23 17:22:55,121 INFO L78 Accepts]: Start accepts. Automaton has 2654 states and 3259 transitions. Word has length 159 [2021-11-23 17:22:55,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:55,122 INFO L470 AbstractCegarLoop]: Abstraction has 2654 states and 3259 transitions. [2021-11-23 17:22:55,122 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 14.2) internal successors, (710), 49 states have internal predecessors, (710), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:22:55,122 INFO L276 IsEmpty]: Start isEmpty. Operand 2654 states and 3259 transitions. [2021-11-23 17:22:55,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 17:22:55,124 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:55,125 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-23 17:22:55,145 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Ended with exit code 0 [2021-11-23 17:22:55,327 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Ended with exit code 0 [2021-11-23 17:22:55,533 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:55,726 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:55,726 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:55,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:55,727 INFO L85 PathProgramCache]: Analyzing trace with hash 766295151, now seen corresponding path program 1 times [2021-11-23 17:22:55,727 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:55,727 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [66685573] [2021-11-23 17:22:55,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:55,727 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:55,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:55,728 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:55,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Waiting until timeout for monitored process [2021-11-23 17:22:55,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:55,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:22:55,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:57,505 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 86 proven. 30 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:22:57,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:57,979 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 86 proven. 30 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:22:57,979 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:57,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [66685573] [2021-11-23 17:22:57,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [66685573] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:57,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1710281396] [2021-11-23 17:22:57,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:57,980 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:57,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:57,980 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:57,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (105)] Waiting until timeout for monitored process [2021-11-23 17:22:58,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:58,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:22:58,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:00,483 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:00,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:01,352 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:01,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1710281396] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:01,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1138110127] [2021-11-23 17:23:01,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:01,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:01,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:01,354 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:01,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2021-11-23 17:23:01,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:01,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:23:01,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:03,283 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 64 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:23:03,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:04,275 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 64 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:23:04,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1138110127] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:04,276 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:04,276 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 49 [2021-11-23 17:23:04,276 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802364285] [2021-11-23 17:23:04,276 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:04,277 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-23 17:23:04,277 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:04,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-23 17:23:04,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=2242, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:23:04,278 INFO L87 Difference]: Start difference. First operand 2654 states and 3259 transitions. Second operand has 50 states, 50 states have (on average 14.26) internal successors, (713), 49 states have internal predecessors, (713), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:05,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:05,648 INFO L93 Difference]: Finished difference Result 3538 states and 4425 transitions. [2021-11-23 17:23:05,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:23:05,648 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 14.26) internal successors, (713), 49 states have internal predecessors, (713), 0 states have call successors, (0), 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 159 [2021-11-23 17:23:05,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:05,651 INFO L225 Difference]: With dead ends: 3538 [2021-11-23 17:23:05,651 INFO L226 Difference]: Without dead ends: 2654 [2021-11-23 17:23:05,652 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 973 GetRequests, 907 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1099 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=419, Invalid=4003, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 17:23:05,653 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 236 mSDsluCounter, 2429 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 236 SdHoareTripleChecker+Valid, 2523 SdHoareTripleChecker+Invalid, 381 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 201 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:05,653 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [236 Valid, 2523 Invalid, 381 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 169 Invalid, 0 Unknown, 201 Unchecked, 0.1s Time] [2021-11-23 17:23:05,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2654 states. [2021-11-23 17:23:05,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2654 to 2654. [2021-11-23 17:23:05,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2654 states, 2653 states have (on average 1.2254052016584998) internal successors, (3251), 2653 states have internal predecessors, (3251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:05,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2654 states to 2654 states and 3251 transitions. [2021-11-23 17:23:05,837 INFO L78 Accepts]: Start accepts. Automaton has 2654 states and 3251 transitions. Word has length 159 [2021-11-23 17:23:05,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:05,837 INFO L470 AbstractCegarLoop]: Abstraction has 2654 states and 3251 transitions. [2021-11-23 17:23:05,838 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 14.26) internal successors, (713), 49 states have internal predecessors, (713), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:05,838 INFO L276 IsEmpty]: Start isEmpty. Operand 2654 states and 3251 transitions. [2021-11-23 17:23:05,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-23 17:23:05,840 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:05,840 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-23 17:23:05,842 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (105)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:06,047 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Ended with exit code 0 [2021-11-23 17:23:06,262 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Ended with exit code 0 [2021-11-23 17:23:06,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:06,441 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:06,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:06,441 INFO L85 PathProgramCache]: Analyzing trace with hash 1583311727, now seen corresponding path program 1 times [2021-11-23 17:23:06,442 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:06,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1292526758] [2021-11-23 17:23:06,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:06,442 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:06,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:06,442 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:06,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (107)] Waiting until timeout for monitored process [2021-11-23 17:23:06,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:06,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:23:06,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:07,827 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 90 proven. 24 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:23:07,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:08,488 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 90 proven. 24 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:23:08,488 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:08,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1292526758] [2021-11-23 17:23:08,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1292526758] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:08,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [239179121] [2021-11-23 17:23:08,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:08,488 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:08,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:08,489 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:08,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (108)] Waiting until timeout for monitored process [2021-11-23 17:23:08,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:08,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:23:08,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:10,419 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:10,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:11,066 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:11,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [239179121] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:11,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [917214701] [2021-11-23 17:23:11,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:11,067 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:11,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:11,067 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:11,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2021-11-23 17:23:11,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:11,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:23:11,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:12,739 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 64 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:23:12,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:13,759 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 64 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:23:13,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [917214701] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:13,759 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:13,759 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 17:23:13,759 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876831739] [2021-11-23 17:23:13,760 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:13,760 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 17:23:13,760 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:13,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 17:23:13,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:23:13,761 INFO L87 Difference]: Start difference. First operand 2654 states and 3251 transitions. Second operand has 39 states, 39 states have (on average 15.846153846153847) internal successors, (618), 38 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 17:23:14,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:14,730 INFO L93 Difference]: Finished difference Result 3646 states and 4552 transitions. [2021-11-23 17:23:14,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:23:14,730 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 15.846153846153847) internal successors, (618), 38 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 159 [2021-11-23 17:23:14,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:14,733 INFO L225 Difference]: With dead ends: 3646 [2021-11-23 17:23:14,733 INFO L226 Difference]: Without dead ends: 2758 [2021-11-23 17:23:14,734 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 970 GetRequests, 915 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=356, Invalid=2614, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:23:14,735 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 337 mSDsluCounter, 2071 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 337 SdHoareTripleChecker+Valid, 2171 SdHoareTripleChecker+Invalid, 233 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 123 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:14,735 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [337 Valid, 2171 Invalid, 233 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 104 Invalid, 0 Unknown, 123 Unchecked, 0.1s Time] [2021-11-23 17:23:14,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2758 states. [2021-11-23 17:23:14,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2758 to 2756. [2021-11-23 17:23:14,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2756 states, 2755 states have (on average 1.2206896551724138) internal successors, (3363), 2755 states have internal predecessors, (3363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:14,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2756 states to 2756 states and 3363 transitions. [2021-11-23 17:23:14,934 INFO L78 Accepts]: Start accepts. Automaton has 2756 states and 3363 transitions. Word has length 159 [2021-11-23 17:23:14,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:14,934 INFO L470 AbstractCegarLoop]: Abstraction has 2756 states and 3363 transitions. [2021-11-23 17:23:14,934 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 15.846153846153847) internal successors, (618), 38 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 17:23:14,934 INFO L276 IsEmpty]: Start isEmpty. Operand 2756 states and 3363 transitions. [2021-11-23 17:23:14,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:23:14,937 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:14,937 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:23:14,958 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Ended with exit code 0 [2021-11-23 17:23:15,145 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (107)] Ended with exit code 0 [2021-11-23 17:23:15,339 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (108)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:15,537 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:15,538 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:15,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:15,538 INFO L85 PathProgramCache]: Analyzing trace with hash -616378828, now seen corresponding path program 1 times [2021-11-23 17:23:15,538 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:15,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1523138181] [2021-11-23 17:23:15,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:15,539 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:15,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:15,539 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:15,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (110)] Waiting until timeout for monitored process [2021-11-23 17:23:15,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:15,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:23:15,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:18,140 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:18,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:18,793 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:18,794 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:18,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1523138181] [2021-11-23 17:23:18,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1523138181] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:18,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1463187923] [2021-11-23 17:23:18,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:18,794 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:18,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:18,796 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:18,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (111)] Waiting until timeout for monitored process [2021-11-23 17:23:18,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:18,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:23:18,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:21,432 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:21,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:21,919 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:21,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1463187923] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:21,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [25129729] [2021-11-23 17:23:21,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:21,919 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:21,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:21,920 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:21,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Waiting until timeout for monitored process [2021-11-23 17:23:22,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:22,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:23:22,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:24,042 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 95 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:23:24,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:24,877 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 95 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:23:24,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [25129729] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:24,878 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:24,878 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:23:24,878 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859071518] [2021-11-23 17:23:24,878 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:24,879 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:23:24,879 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:24,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:23:24,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:23:24,880 INFO L87 Difference]: Start difference. First operand 2756 states and 3363 transitions. Second operand has 34 states, 34 states have (on average 15.441176470588236) internal successors, (525), 33 states have internal predecessors, (525), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:25,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:25,511 INFO L93 Difference]: Finished difference Result 4397 states and 5422 transitions. [2021-11-23 17:23:25,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:23:25,511 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 15.441176470588236) internal successors, (525), 33 states have internal predecessors, (525), 0 states have call successors, (0), 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 160 [2021-11-23 17:23:25,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:25,514 INFO L225 Difference]: With dead ends: 4397 [2021-11-23 17:23:25,514 INFO L226 Difference]: Without dead ends: 3410 [2021-11-23 17:23:25,515 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 967 GetRequests, 925 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=251, Invalid=1641, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:23:25,516 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 168 mSDsluCounter, 2018 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 2136 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 149 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:25,516 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [168 Valid, 2136 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 62 Invalid, 0 Unknown, 149 Unchecked, 0.0s Time] [2021-11-23 17:23:25,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3410 states. [2021-11-23 17:23:25,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3410 to 3410. [2021-11-23 17:23:25,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3410 states, 3409 states have (on average 1.2129656790847756) internal successors, (4135), 3409 states have internal predecessors, (4135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:25,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3410 states to 3410 states and 4135 transitions. [2021-11-23 17:23:25,759 INFO L78 Accepts]: Start accepts. Automaton has 3410 states and 4135 transitions. Word has length 160 [2021-11-23 17:23:25,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:25,759 INFO L470 AbstractCegarLoop]: Abstraction has 3410 states and 4135 transitions. [2021-11-23 17:23:25,759 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 15.441176470588236) internal successors, (525), 33 states have internal predecessors, (525), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:25,759 INFO L276 IsEmpty]: Start isEmpty. Operand 3410 states and 4135 transitions. [2021-11-23 17:23:25,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:23:25,764 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:25,764 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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 17:23:25,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (110)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:25,996 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Ended with exit code 0 [2021-11-23 17:23:26,177 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (111)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:26,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:26,376 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:26,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:26,376 INFO L85 PathProgramCache]: Analyzing trace with hash -1234914459, now seen corresponding path program 1 times [2021-11-23 17:23:26,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:26,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [990743118] [2021-11-23 17:23:26,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:26,377 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:26,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:26,378 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:26,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (113)] Waiting until timeout for monitored process [2021-11-23 17:23:26,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:26,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:23:26,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:28,933 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 38 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:28,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:29,515 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 38 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:29,515 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:29,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [990743118] [2021-11-23 17:23:29,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [990743118] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:29,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2046103168] [2021-11-23 17:23:29,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:29,516 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:29,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:29,516 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:29,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (114)] Waiting until timeout for monitored process [2021-11-23 17:23:29,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:29,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:23:29,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:32,098 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 38 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:32,098 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:32,483 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 38 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:32,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2046103168] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:32,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [328493323] [2021-11-23 17:23:32,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:32,484 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:32,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:32,485 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:32,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2021-11-23 17:23:32,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:32,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:23:32,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:34,571 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 38 proven. 88 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:23:34,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:35,296 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 38 proven. 88 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:23:35,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [328493323] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:35,297 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:35,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:23:35,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603968048] [2021-11-23 17:23:35,297 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:35,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:23:35,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:35,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:23:35,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:23:35,299 INFO L87 Difference]: Start difference. First operand 3410 states and 4135 transitions. Second operand has 34 states, 34 states have (on average 15.117647058823529) internal successors, (514), 33 states have internal predecessors, (514), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:35,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:35,919 INFO L93 Difference]: Finished difference Result 4347 states and 5348 transitions. [2021-11-23 17:23:35,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:23:35,920 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 15.117647058823529) internal successors, (514), 33 states have internal predecessors, (514), 0 states have call successors, (0), 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 160 [2021-11-23 17:23:35,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:35,923 INFO L225 Difference]: With dead ends: 4347 [2021-11-23 17:23:35,923 INFO L226 Difference]: Without dead ends: 3458 [2021-11-23 17:23:35,925 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 968 GetRequests, 926 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=246, Invalid=1646, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:23:35,926 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 225 mSDsluCounter, 2002 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 2117 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 138 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:35,926 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [225 Valid, 2117 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 36 Invalid, 0 Unknown, 138 Unchecked, 0.0s Time] [2021-11-23 17:23:35,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3458 states. [2021-11-23 17:23:36,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3458 to 3410. [2021-11-23 17:23:36,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3410 states, 3409 states have (on average 1.2129656790847756) internal successors, (4135), 3409 states have internal predecessors, (4135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:36,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3410 states to 3410 states and 4135 transitions. [2021-11-23 17:23:36,198 INFO L78 Accepts]: Start accepts. Automaton has 3410 states and 4135 transitions. Word has length 160 [2021-11-23 17:23:36,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:36,198 INFO L470 AbstractCegarLoop]: Abstraction has 3410 states and 4135 transitions. [2021-11-23 17:23:36,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 15.117647058823529) internal successors, (514), 33 states have internal predecessors, (514), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:36,198 INFO L276 IsEmpty]: Start isEmpty. Operand 3410 states and 4135 transitions. [2021-11-23 17:23:36,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:23:36,202 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:36,202 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:23:36,210 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (113)] Ended with exit code 0 [2021-11-23 17:23:36,423 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Ended with exit code 0 [2021-11-23 17:23:36,604 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (114)] Ended with exit code 0 [2021-11-23 17:23:36,802 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:36,803 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:36,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:36,803 INFO L85 PathProgramCache]: Analyzing trace with hash -1464170886, now seen corresponding path program 1 times [2021-11-23 17:23:36,804 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:36,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [228408847] [2021-11-23 17:23:36,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:36,804 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:36,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:36,806 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:36,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (116)] Waiting until timeout for monitored process [2021-11-23 17:23:36,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:36,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:23:36,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:39,304 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:39,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:39,926 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:39,927 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:39,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [228408847] [2021-11-23 17:23:39,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [228408847] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:39,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1876017519] [2021-11-23 17:23:39,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:39,927 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:39,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:39,928 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:39,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (117)] Waiting until timeout for monitored process [2021-11-23 17:23:40,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:40,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:23:40,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:42,634 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:42,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:43,075 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:43,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1876017519] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:43,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1320720425] [2021-11-23 17:23:43,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:43,076 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:43,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:43,077 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:43,077 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Waiting until timeout for monitored process [2021-11-23 17:23:43,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:43,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:23:43,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:45,188 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 95 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:23:45,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:45,955 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 95 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:23:45,955 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1320720425] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:45,955 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:45,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:23:45,956 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072238825] [2021-11-23 17:23:45,956 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:45,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:23:45,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:45,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:23:45,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:23:45,958 INFO L87 Difference]: Start difference. First operand 3410 states and 4135 transitions. Second operand has 34 states, 34 states have (on average 15.441176470588236) internal successors, (525), 33 states have internal predecessors, (525), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:46,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:46,580 INFO L93 Difference]: Finished difference Result 4611 states and 5663 transitions. [2021-11-23 17:23:46,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 17:23:46,580 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 15.441176470588236) internal successors, (525), 33 states have internal predecessors, (525), 0 states have call successors, (0), 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 160 [2021-11-23 17:23:46,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:46,584 INFO L225 Difference]: With dead ends: 4611 [2021-11-23 17:23:46,584 INFO L226 Difference]: Without dead ends: 3740 [2021-11-23 17:23:46,586 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 968 GetRequests, 926 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=246, Invalid=1646, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:23:46,586 INFO L933 BasicCegarLoop]: 117 mSDtfsCounter, 232 mSDsluCounter, 2002 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 232 SdHoareTripleChecker+Valid, 2119 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 125 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:46,586 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [232 Valid, 2119 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 34 Invalid, 0 Unknown, 125 Unchecked, 0.0s Time] [2021-11-23 17:23:46,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3740 states. [2021-11-23 17:23:46,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3740 to 3684. [2021-11-23 17:23:46,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3684 states, 3683 states have (on average 1.2123269074124354) internal successors, (4465), 3683 states have internal predecessors, (4465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:46,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3684 states to 3684 states and 4465 transitions. [2021-11-23 17:23:46,909 INFO L78 Accepts]: Start accepts. Automaton has 3684 states and 4465 transitions. Word has length 160 [2021-11-23 17:23:46,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:46,909 INFO L470 AbstractCegarLoop]: Abstraction has 3684 states and 4465 transitions. [2021-11-23 17:23:46,909 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 15.441176470588236) internal successors, (525), 33 states have internal predecessors, (525), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:46,910 INFO L276 IsEmpty]: Start isEmpty. Operand 3684 states and 4465 transitions. [2021-11-23 17:23:46,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:23:46,914 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:46,915 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-23 17:23:46,948 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Ended with exit code 0 [2021-11-23 17:23:47,136 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (116)] Ended with exit code 0 [2021-11-23 17:23:47,331 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (117)] Ended with exit code 0 [2021-11-23 17:23:47,529 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:47,529 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:47,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:47,530 INFO L85 PathProgramCache]: Analyzing trace with hash -435827766, now seen corresponding path program 1 times [2021-11-23 17:23:47,530 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:47,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [349311904] [2021-11-23 17:23:47,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:47,530 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:47,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:47,531 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:47,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (119)] Waiting until timeout for monitored process [2021-11-23 17:23:47,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:47,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:23:47,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:48,713 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:23:48,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:49,356 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:23:49,356 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:49,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [349311904] [2021-11-23 17:23:49,356 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [349311904] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:49,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1851457263] [2021-11-23 17:23:49,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:49,356 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:49,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:49,357 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:49,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (120)] Waiting until timeout for monitored process [2021-11-23 17:23:49,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:49,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:23:49,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:50,513 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:23:50,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:51,145 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:23:51,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1851457263] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:51,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [90767561] [2021-11-23 17:23:51,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:51,145 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:51,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:51,146 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:51,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Waiting until timeout for monitored process [2021-11-23 17:23:51,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:51,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:23:51,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:52,280 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:23:52,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:52,834 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 55 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:23:52,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [90767561] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:52,834 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:52,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:23:52,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475419114] [2021-11-23 17:23:52,835 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:52,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:23:52,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:52,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:23:52,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:23:52,836 INFO L87 Difference]: Start difference. First operand 3684 states and 4465 transitions. Second operand has 16 states, 16 states have (on average 14.3125) internal successors, (229), 15 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:53,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:53,374 INFO L93 Difference]: Finished difference Result 5591 states and 6959 transitions. [2021-11-23 17:23:53,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:23:53,375 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 14.3125) internal successors, (229), 15 states have internal predecessors, (229), 0 states have call successors, (0), 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 160 [2021-11-23 17:23:53,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:53,379 INFO L225 Difference]: With dead ends: 5591 [2021-11-23 17:23:53,379 INFO L226 Difference]: Without dead ends: 4764 [2021-11-23 17:23:53,380 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 963 GetRequests, 941 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=119, Invalid=433, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:23:53,381 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 161 mSDsluCounter, 1104 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 1215 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 127 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:53,381 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [161 Valid, 1215 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 51 Invalid, 0 Unknown, 127 Unchecked, 0.0s Time] [2021-11-23 17:23:53,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4764 states. [2021-11-23 17:23:53,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4764 to 4734. [2021-11-23 17:23:53,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4734 states, 4733 states have (on average 1.2305091907880836) internal successors, (5824), 4733 states have internal predecessors, (5824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:53,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4734 states to 4734 states and 5824 transitions. [2021-11-23 17:23:53,728 INFO L78 Accepts]: Start accepts. Automaton has 4734 states and 5824 transitions. Word has length 160 [2021-11-23 17:23:53,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:53,728 INFO L470 AbstractCegarLoop]: Abstraction has 4734 states and 5824 transitions. [2021-11-23 17:23:53,729 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 14.3125) internal successors, (229), 15 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:53,729 INFO L276 IsEmpty]: Start isEmpty. Operand 4734 states and 5824 transitions. [2021-11-23 17:23:53,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:23:53,732 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:53,733 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-23 17:23:53,734 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (120)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:53,940 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (119)] Ended with exit code 0 [2021-11-23 17:23:54,157 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Ended with exit code 0 [2021-11-23 17:23:54,333 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:54,333 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:54,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:54,334 INFO L85 PathProgramCache]: Analyzing trace with hash -32940692, now seen corresponding path program 1 times [2021-11-23 17:23:54,334 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:54,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2139382330] [2021-11-23 17:23:54,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:54,334 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:54,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:54,335 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:54,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (122)] Waiting until timeout for monitored process [2021-11-23 17:23:54,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:54,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:23:54,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:55,309 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 112 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:23:55,309 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:23:55,309 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:55,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2139382330] [2021-11-23 17:23:55,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2139382330] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:23:55,310 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:23:55,310 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:23:55,310 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309647339] [2021-11-23 17:23:55,310 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:23:55,310 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:23:55,310 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:55,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:23:55,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:23:55,310 INFO L87 Difference]: Start difference. First operand 4734 states and 5824 transitions. Second operand has 6 states, 6 states have (on average 25.0) internal successors, (150), 5 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:55,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:55,708 INFO L93 Difference]: Finished difference Result 6455 states and 8081 transitions. [2021-11-23 17:23:55,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:23:55,709 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 25.0) internal successors, (150), 5 states have internal predecessors, (150), 0 states have call successors, (0), 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 160 [2021-11-23 17:23:55,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:55,713 INFO L225 Difference]: With dead ends: 6455 [2021-11-23 17:23:55,713 INFO L226 Difference]: Without dead ends: 5583 [2021-11-23 17:23:55,715 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:23:55,715 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 61 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 406 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 50 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:55,715 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 406 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 50 Unchecked, 0.0s Time] [2021-11-23 17:23:55,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5583 states. [2021-11-23 17:23:56,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5583 to 5581. [2021-11-23 17:23:56,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5581 states, 5580 states have (on average 1.2370967741935484) internal successors, (6903), 5580 states have internal predecessors, (6903), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:56,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5581 states to 5581 states and 6903 transitions. [2021-11-23 17:23:56,154 INFO L78 Accepts]: Start accepts. Automaton has 5581 states and 6903 transitions. Word has length 160 [2021-11-23 17:23:56,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:56,155 INFO L470 AbstractCegarLoop]: Abstraction has 5581 states and 6903 transitions. [2021-11-23 17:23:56,155 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 25.0) internal successors, (150), 5 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:23:56,155 INFO L276 IsEmpty]: Start isEmpty. Operand 5581 states and 6903 transitions. [2021-11-23 17:23:56,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:23:56,177 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:56,177 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-23 17:23:56,190 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (122)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:56,378 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:23:56,378 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:56,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:56,378 INFO L85 PathProgramCache]: Analyzing trace with hash 436898924, now seen corresponding path program 1 times [2021-11-23 17:23:56,379 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:56,379 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2015232610] [2021-11-23 17:23:56,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:56,379 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:56,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:56,380 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:56,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (123)] Waiting until timeout for monitored process [2021-11-23 17:23:56,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:56,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:23:56,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:58,176 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 79 proven. 42 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:23:58,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:58,810 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 79 proven. 42 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:23:58,811 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:58,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2015232610] [2021-11-23 17:23:58,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2015232610] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:58,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [519180516] [2021-11-23 17:23:58,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:58,811 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:58,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:58,812 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:58,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (124)] Waiting until timeout for monitored process [2021-11-23 17:23:58,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:58,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:23:58,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:00,206 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 56 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:24:00,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:00,899 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 56 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:24:00,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [519180516] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:00,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [792634069] [2021-11-23 17:24:00,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:00,899 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:00,900 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:00,900 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:00,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Waiting until timeout for monitored process [2021-11-23 17:24:00,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:00,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:24:00,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:02,094 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 56 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:24:02,094 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:02,667 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 56 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:24:02,667 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [792634069] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:02,667 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:02,667 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:24:02,668 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266861016] [2021-11-23 17:24:02,668 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:02,668 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:24:02,668 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:02,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:24:02,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:24:02,669 INFO L87 Difference]: Start difference. First operand 5581 states and 6903 transitions. Second operand has 32 states, 32 states have (on average 14.125) internal successors, (452), 31 states have internal predecessors, (452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:04,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:04,188 INFO L93 Difference]: Finished difference Result 8913 states and 11191 transitions. [2021-11-23 17:24:04,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:24:04,188 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 14.125) internal successors, (452), 31 states have internal predecessors, (452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 160 [2021-11-23 17:24:04,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:04,196 INFO L225 Difference]: With dead ends: 8913 [2021-11-23 17:24:04,196 INFO L226 Difference]: Without dead ends: 8037 [2021-11-23 17:24:04,198 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 981 GetRequests, 929 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=310, Invalid=2342, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 17:24:04,199 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 334 mSDsluCounter, 2483 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 334 SdHoareTripleChecker+Valid, 2622 SdHoareTripleChecker+Invalid, 476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 360 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:04,199 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [334 Valid, 2622 Invalid, 476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 108 Invalid, 0 Unknown, 360 Unchecked, 0.1s Time] [2021-11-23 17:24:04,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8037 states. [2021-11-23 17:24:04,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8037 to 8011. [2021-11-23 17:24:04,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8011 states, 8010 states have (on average 1.2480649188514357) internal successors, (9997), 8010 states have internal predecessors, (9997), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:04,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8011 states to 8011 states and 9997 transitions. [2021-11-23 17:24:04,793 INFO L78 Accepts]: Start accepts. Automaton has 8011 states and 9997 transitions. Word has length 160 [2021-11-23 17:24:04,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:04,793 INFO L470 AbstractCegarLoop]: Abstraction has 8011 states and 9997 transitions. [2021-11-23 17:24:04,793 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 14.125) internal successors, (452), 31 states have internal predecessors, (452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:04,793 INFO L276 IsEmpty]: Start isEmpty. Operand 8011 states and 9997 transitions. [2021-11-23 17:24:04,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:24:04,798 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:04,798 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-23 17:24:04,819 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Ended with exit code 0 [2021-11-23 17:24:05,006 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (123)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:05,200 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (124)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:05,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:05,399 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:05,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:05,399 INFO L85 PathProgramCache]: Analyzing trace with hash -472106132, now seen corresponding path program 1 times [2021-11-23 17:24:05,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:05,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [90446236] [2021-11-23 17:24:05,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:05,400 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:05,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:05,402 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:05,402 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (126)] Waiting until timeout for monitored process [2021-11-23 17:24:05,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:05,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:24:05,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:07,243 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 83 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:24:07,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:07,810 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 83 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:24:07,810 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:07,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [90446236] [2021-11-23 17:24:07,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [90446236] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:07,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [996850031] [2021-11-23 17:24:07,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:07,811 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:07,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:07,812 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:07,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (127)] Waiting until timeout for monitored process [2021-11-23 17:24:07,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:07,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:24:07,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:09,210 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 56 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:24:09,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:09,940 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 56 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:24:09,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [996850031] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:09,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1403595143] [2021-11-23 17:24:09,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:09,941 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:09,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:09,942 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:09,945 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Waiting until timeout for monitored process [2021-11-23 17:24:10,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:10,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:24:10,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:11,136 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 56 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:24:11,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:11,703 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 56 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:24:11,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1403595143] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:11,703 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:11,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:24:11,704 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957392238] [2021-11-23 17:24:11,704 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:11,705 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:24:11,705 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:11,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:24:11,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:24:11,705 INFO L87 Difference]: Start difference. First operand 8011 states and 9997 transitions. Second operand has 32 states, 32 states have (on average 14.21875) internal successors, (455), 31 states have internal predecessors, (455), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:13,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:13,291 INFO L93 Difference]: Finished difference Result 10800 states and 13606 transitions. [2021-11-23 17:24:13,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:24:13,292 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 14.21875) internal successors, (455), 31 states have internal predecessors, (455), 0 states have call successors, (0), 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 160 [2021-11-23 17:24:13,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:13,300 INFO L225 Difference]: With dead ends: 10800 [2021-11-23 17:24:13,301 INFO L226 Difference]: Without dead ends: 9920 [2021-11-23 17:24:13,303 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 981 GetRequests, 929 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=307, Invalid=2345, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 17:24:13,304 INFO L933 BasicCegarLoop]: 136 mSDtfsCounter, 305 mSDsluCounter, 2405 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 305 SdHoareTripleChecker+Valid, 2541 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 144 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:13,304 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [305 Valid, 2541 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 105 Invalid, 0 Unknown, 144 Unchecked, 0.1s Time] [2021-11-23 17:24:13,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9920 states. [2021-11-23 17:24:14,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9920 to 9894. [2021-11-23 17:24:14,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9894 states, 9893 states have (on average 1.2541190740927928) internal successors, (12407), 9893 states have internal predecessors, (12407), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:14,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9894 states to 9894 states and 12407 transitions. [2021-11-23 17:24:14,036 INFO L78 Accepts]: Start accepts. Automaton has 9894 states and 12407 transitions. Word has length 160 [2021-11-23 17:24:14,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:14,037 INFO L470 AbstractCegarLoop]: Abstraction has 9894 states and 12407 transitions. [2021-11-23 17:24:14,037 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 14.21875) internal successors, (455), 31 states have internal predecessors, (455), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:14,037 INFO L276 IsEmpty]: Start isEmpty. Operand 9894 states and 12407 transitions. [2021-11-23 17:24:14,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:24:14,042 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:14,042 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-23 17:24:14,047 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (127)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:14,263 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Ended with exit code 0 [2021-11-23 17:24:14,449 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (126)] Ended with exit code 0 [2021-11-23 17:24:14,642 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:24:14,643 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:14,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:14,643 INFO L85 PathProgramCache]: Analyzing trace with hash -12686740, now seen corresponding path program 1 times [2021-11-23 17:24:14,643 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:14,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2098382772] [2021-11-23 17:24:14,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:14,644 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:14,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:14,645 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:14,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (129)] Waiting until timeout for monitored process [2021-11-23 17:24:14,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:14,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:24:14,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:16,403 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 87 proven. 30 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:24:16,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:16,886 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 87 proven. 30 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:24:16,886 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:16,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2098382772] [2021-11-23 17:24:16,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2098382772] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:16,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1907333481] [2021-11-23 17:24:16,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:16,886 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:16,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:16,887 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:16,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (130)] Waiting until timeout for monitored process [2021-11-23 17:24:17,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:17,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:24:17,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:18,259 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 56 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:24:18,259 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:18,923 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 56 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:24:18,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1907333481] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:18,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1880159407] [2021-11-23 17:24:18,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:18,923 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:18,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:18,924 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:18,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Waiting until timeout for monitored process [2021-11-23 17:24:19,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:19,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:24:19,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:20,145 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 56 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:24:20,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:20,770 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 56 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:24:20,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1880159407] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:20,770 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:20,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:24:20,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399152831] [2021-11-23 17:24:20,771 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:20,771 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:24:20,771 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:20,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:24:20,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:24:20,772 INFO L87 Difference]: Start difference. First operand 9894 states and 12407 transitions. Second operand has 32 states, 32 states have (on average 14.3125) internal successors, (458), 31 states have internal predecessors, (458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:22,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:22,370 INFO L93 Difference]: Finished difference Result 13752 states and 17380 transitions. [2021-11-23 17:24:22,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 17:24:22,371 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 14.3125) internal successors, (458), 31 states have internal predecessors, (458), 0 states have call successors, (0), 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 160 [2021-11-23 17:24:22,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:22,387 INFO L225 Difference]: With dead ends: 13752 [2021-11-23 17:24:22,387 INFO L226 Difference]: Without dead ends: 12868 [2021-11-23 17:24:22,390 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 929 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 540 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=286, Invalid=2164, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:24:22,390 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 190 mSDsluCounter, 2103 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 2224 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 149 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:22,391 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [190 Valid, 2224 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 120 Invalid, 0 Unknown, 149 Unchecked, 0.1s Time] [2021-11-23 17:24:22,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12868 states. [2021-11-23 17:24:23,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12868 to 12864. [2021-11-23 17:24:23,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12864 states, 12863 states have (on average 1.2592707766461946) internal successors, (16198), 12863 states have internal predecessors, (16198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:23,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12864 states to 12864 states and 16198 transitions. [2021-11-23 17:24:23,333 INFO L78 Accepts]: Start accepts. Automaton has 12864 states and 16198 transitions. Word has length 160 [2021-11-23 17:24:23,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:23,333 INFO L470 AbstractCegarLoop]: Abstraction has 12864 states and 16198 transitions. [2021-11-23 17:24:23,333 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 14.3125) internal successors, (458), 31 states have internal predecessors, (458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:23,333 INFO L276 IsEmpty]: Start isEmpty. Operand 12864 states and 16198 transitions. [2021-11-23 17:24:23,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:24:23,338 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:23,339 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-23 17:24:23,359 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:23,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (129)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:23,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (130)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:23,940 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:23,940 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:23,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:23,944 INFO L85 PathProgramCache]: Analyzing trace with hash 804329836, now seen corresponding path program 1 times [2021-11-23 17:24:23,944 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:23,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [149880885] [2021-11-23 17:24:23,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:23,945 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:23,945 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:23,946 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:23,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (132)] Waiting until timeout for monitored process [2021-11-23 17:24:24,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:24,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:24:24,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:25,358 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 91 proven. 24 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:24:25,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:26,045 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 91 proven. 24 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:24:26,045 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:26,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [149880885] [2021-11-23 17:24:26,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [149880885] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:26,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [20789395] [2021-11-23 17:24:26,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:26,045 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:26,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:26,046 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:26,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (133)] Waiting until timeout for monitored process [2021-11-23 17:24:26,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:26,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:24:26,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:27,392 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 56 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:24:27,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:28,002 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 56 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:24:28,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [20789395] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:28,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1204108252] [2021-11-23 17:24:28,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:28,002 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:28,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:28,003 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:28,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Waiting until timeout for monitored process [2021-11-23 17:24:28,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:28,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:24:28,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:29,086 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 56 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:24:29,086 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:29,674 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 56 proven. 26 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 17:24:29,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1204108252] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:29,675 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:29,675 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 19 [2021-11-23 17:24:29,675 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872634748] [2021-11-23 17:24:29,675 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:29,676 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 17:24:29,676 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:29,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 17:24:29,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:24:29,676 INFO L87 Difference]: Start difference. First operand 12864 states and 16198 transitions. Second operand has 20 states, 20 states have (on average 16.15) internal successors, (323), 19 states have internal predecessors, (323), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:30,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:30,965 INFO L93 Difference]: Finished difference Result 18059 states and 22833 transitions. [2021-11-23 17:24:30,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 17:24:30,966 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 16.15) internal successors, (323), 19 states have internal predecessors, (323), 0 states have call successors, (0), 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 160 [2021-11-23 17:24:30,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:30,983 INFO L225 Difference]: With dead ends: 18059 [2021-11-23 17:24:30,983 INFO L226 Difference]: Without dead ends: 17171 [2021-11-23 17:24:30,987 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 966 GetRequests, 939 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=142, Invalid=670, Unknown=0, NotChecked=0, Total=812 [2021-11-23 17:24:30,988 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 134 mSDsluCounter, 1510 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 1645 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 130 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:30,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 1645 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 75 Invalid, 0 Unknown, 130 Unchecked, 0.0s Time] [2021-11-23 17:24:31,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17171 states. [2021-11-23 17:24:32,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17171 to 17165. [2021-11-23 17:24:32,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17165 states, 17164 states have (on average 1.256641808436262) internal successors, (21569), 17164 states have internal predecessors, (21569), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:32,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17165 states to 17165 states and 21569 transitions. [2021-11-23 17:24:32,420 INFO L78 Accepts]: Start accepts. Automaton has 17165 states and 21569 transitions. Word has length 160 [2021-11-23 17:24:32,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:32,421 INFO L470 AbstractCegarLoop]: Abstraction has 17165 states and 21569 transitions. [2021-11-23 17:24:32,421 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 16.15) internal successors, (323), 19 states have internal predecessors, (323), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:32,421 INFO L276 IsEmpty]: Start isEmpty. Operand 17165 states and 21569 transitions. [2021-11-23 17:24:32,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:24:32,427 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:32,427 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-23 17:24:32,448 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Ended with exit code 0 [2021-11-23 17:24:32,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (132)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:32,831 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (133)] Ended with exit code 0 [2021-11-23 17:24:33,029 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 134 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,132 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,133 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:33,030 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:33,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:33,030 INFO L85 PathProgramCache]: Analyzing trace with hash -2071630925, now seen corresponding path program 1 times [2021-11-23 17:24:33,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:33,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1748625034] [2021-11-23 17:24:33,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:33,030 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:33,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:33,031 INFO L229 MonitoredProcess]: Starting monitored process 135 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:33,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (135)] Waiting until timeout for monitored process [2021-11-23 17:24:33,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:33,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:24:33,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:33,990 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 109 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 17:24:33,990 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:24:33,991 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:33,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1748625034] [2021-11-23 17:24:33,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1748625034] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:24:33,991 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:24:33,991 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:24:33,991 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309640509] [2021-11-23 17:24:33,991 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:24:33,991 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:24:33,991 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:33,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:24:33,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:24:33,992 INFO L87 Difference]: Start difference. First operand 17165 states and 21569 transitions. Second operand has 6 states, 6 states have (on average 24.833333333333332) internal successors, (149), 5 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 17:24:35,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:35,630 INFO L93 Difference]: Finished difference Result 26632 states and 33639 transitions. [2021-11-23 17:24:35,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:24:35,631 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 24.833333333333332) internal successors, (149), 5 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 160 [2021-11-23 17:24:35,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:35,662 INFO L225 Difference]: With dead ends: 26632 [2021-11-23 17:24:35,662 INFO L226 Difference]: Without dead ends: 25756 [2021-11-23 17:24:35,669 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:24:35,669 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 90 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 404 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 93 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:35,670 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 404 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 93 Unchecked, 0.0s Time] [2021-11-23 17:24:35,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25756 states. [2021-11-23 17:24:37,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25756 to 25534. [2021-11-23 17:24:37,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25534 states, 25533 states have (on average 1.2571965691458113) internal successors, (32100), 25533 states have internal predecessors, (32100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:37,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25534 states to 25534 states and 32100 transitions. [2021-11-23 17:24:37,731 INFO L78 Accepts]: Start accepts. Automaton has 25534 states and 32100 transitions. Word has length 160 [2021-11-23 17:24:37,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:37,731 INFO L470 AbstractCegarLoop]: Abstraction has 25534 states and 32100 transitions. [2021-11-23 17:24:37,731 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 24.833333333333332) internal successors, (149), 5 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 17:24:37,731 INFO L276 IsEmpty]: Start isEmpty. Operand 25534 states and 32100 transitions. [2021-11-23 17:24:37,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:24:37,739 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:37,739 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-23 17:24:37,750 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (135)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:37,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 135 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:24:37,945 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:37,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:37,946 INFO L85 PathProgramCache]: Analyzing trace with hash 1643622348, now seen corresponding path program 1 times [2021-11-23 17:24:37,946 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:37,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [464128893] [2021-11-23 17:24:37,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:37,946 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:37,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:37,947 INFO L229 MonitoredProcess]: Starting monitored process 136 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:37,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (136)] Waiting until timeout for monitored process [2021-11-23 17:24:38,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:38,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:24:38,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:38,865 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 107 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:24:38,865 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:24:38,866 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:38,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [464128893] [2021-11-23 17:24:38,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [464128893] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:24:38,866 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:24:38,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:24:38,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241316816] [2021-11-23 17:24:38,866 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:24:38,866 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:24:38,867 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:38,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:24:38,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:24:38,867 INFO L87 Difference]: Start difference. First operand 25534 states and 32100 transitions. Second operand has 6 states, 6 states have (on average 24.666666666666668) internal successors, (148), 5 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:41,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:41,309 INFO L93 Difference]: Finished difference Result 37645 states and 47538 transitions. [2021-11-23 17:24:41,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:24:41,309 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 24.666666666666668) internal successors, (148), 5 states have internal predecessors, (148), 0 states have call successors, (0), 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 160 [2021-11-23 17:24:41,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:41,356 INFO L225 Difference]: With dead ends: 37645 [2021-11-23 17:24:41,357 INFO L226 Difference]: Without dead ends: 35887 [2021-11-23 17:24:41,365 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:24:41,366 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 81 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 381 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:41,366 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 381 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 59 Unchecked, 0.0s Time] [2021-11-23 17:24:41,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35887 states. [2021-11-23 17:24:44,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35887 to 35885. [2021-11-23 17:24:44,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35885 states, 35884 states have (on average 1.254932560472634) internal successors, (45032), 35884 states have internal predecessors, (45032), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:44,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35885 states to 35885 states and 45032 transitions. [2021-11-23 17:24:44,697 INFO L78 Accepts]: Start accepts. Automaton has 35885 states and 45032 transitions. Word has length 160 [2021-11-23 17:24:44,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:44,698 INFO L470 AbstractCegarLoop]: Abstraction has 35885 states and 45032 transitions. [2021-11-23 17:24:44,698 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 24.666666666666668) internal successors, (148), 5 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:44,698 INFO L276 IsEmpty]: Start isEmpty. Operand 35885 states and 45032 transitions. [2021-11-23 17:24:44,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:24:44,710 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:44,710 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-23 17:24:44,724 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (136)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:44,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 136 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:24:44,924 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:44,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:44,925 INFO L85 PathProgramCache]: Analyzing trace with hash 444043603, now seen corresponding path program 1 times [2021-11-23 17:24:44,925 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:44,925 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1764862605] [2021-11-23 17:24:44,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:44,925 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:44,925 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:44,926 INFO L229 MonitoredProcess]: Starting monitored process 137 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:45,004 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (137)] Waiting until timeout for monitored process [2021-11-23 17:24:45,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:45,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:24:45,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:46,035 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 105 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 17:24:46,036 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:24:46,036 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:46,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1764862605] [2021-11-23 17:24:46,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1764862605] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:24:46,036 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:24:46,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:24:46,036 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068109105] [2021-11-23 17:24:46,036 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:24:46,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:24:46,036 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:46,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:24:46,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:24:46,037 INFO L87 Difference]: Start difference. First operand 35885 states and 45032 transitions. Second operand has 6 states, 6 states have (on average 24.5) internal successors, (147), 5 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:50,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:50,051 INFO L93 Difference]: Finished difference Result 55466 states and 69771 transitions. [2021-11-23 17:24:50,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:24:50,127 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 24.5) internal successors, (147), 5 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 160 [2021-11-23 17:24:50,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:50,201 INFO L225 Difference]: With dead ends: 55466 [2021-11-23 17:24:50,201 INFO L226 Difference]: Without dead ends: 53700 [2021-11-23 17:24:50,212 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:24:50,213 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 114 mSDsluCounter, 190 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 320 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 44 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:50,213 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 320 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 44 Unchecked, 0.0s Time] [2021-11-23 17:24:50,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53700 states. [2021-11-23 17:24:54,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53700 to 53432. [2021-11-23 17:24:54,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53432 states, 53431 states have (on average 1.251483221350901) internal successors, (66868), 53431 states have internal predecessors, (66868), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:54,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53432 states to 53432 states and 66868 transitions. [2021-11-23 17:24:54,980 INFO L78 Accepts]: Start accepts. Automaton has 53432 states and 66868 transitions. Word has length 160 [2021-11-23 17:24:54,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:54,980 INFO L470 AbstractCegarLoop]: Abstraction has 53432 states and 66868 transitions. [2021-11-23 17:24:54,980 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 24.5) internal successors, (147), 5 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:24:54,980 INFO L276 IsEmpty]: Start isEmpty. Operand 53432 states and 66868 transitions. [2021-11-23 17:24:54,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:24:54,990 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:54,990 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:24:55,000 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (137)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:55,191 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 137 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:24:55,191 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:55,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:55,192 INFO L85 PathProgramCache]: Analyzing trace with hash 1208134748, now seen corresponding path program 1 times [2021-11-23 17:24:55,192 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:55,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1475231528] [2021-11-23 17:24:55,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:55,193 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:55,193 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:55,197 INFO L229 MonitoredProcess]: Starting monitored process 138 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:55,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (138)] Waiting until timeout for monitored process [2021-11-23 17:24:55,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:55,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:24:55,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:57,667 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 41 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:57,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:58,647 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 41 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:58,647 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:58,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1475231528] [2021-11-23 17:24:58,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1475231528] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:58,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [888110447] [2021-11-23 17:24:58,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:58,647 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:58,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:58,648 INFO L229 MonitoredProcess]: Starting monitored process 139 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:58,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (139)] Waiting until timeout for monitored process [2021-11-23 17:24:58,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:58,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:24:58,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:00,820 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 41 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:00,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:01,540 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 41 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:01,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [888110447] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:01,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1570868768] [2021-11-23 17:25:01,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:01,541 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:01,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:01,542 INFO L229 MonitoredProcess]: Starting monitored process 140 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:01,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (140)] Waiting until timeout for monitored process [2021-11-23 17:25:01,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:01,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:25:01,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:04,643 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 41 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:04,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:05,529 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 41 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:05,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1570868768] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:05,530 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:05,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13, 13] total 25 [2021-11-23 17:25:05,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328737445] [2021-11-23 17:25:05,530 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:05,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 17:25:05,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:05,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 17:25:05,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2021-11-23 17:25:05,532 INFO L87 Difference]: Start difference. First operand 53432 states and 66868 transitions. Second operand has 26 states, 26 states have (on average 11.5) internal successors, (299), 25 states have internal predecessors, (299), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:09,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:09,422 INFO L93 Difference]: Finished difference Result 54907 states and 68819 transitions. [2021-11-23 17:25:09,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 17:25:09,423 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 11.5) internal successors, (299), 25 states have internal predecessors, (299), 0 states have call successors, (0), 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 160 [2021-11-23 17:25:09,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:09,491 INFO L225 Difference]: With dead ends: 54907 [2021-11-23 17:25:09,492 INFO L226 Difference]: Without dead ends: 53410 [2021-11-23 17:25:09,500 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 958 GetRequests, 930 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=122, Invalid=748, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:25:09,501 INFO L933 BasicCegarLoop]: 140 mSDtfsCounter, 218 mSDsluCounter, 1813 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 1953 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 175 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:09,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 1953 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 132 Invalid, 0 Unknown, 175 Unchecked, 0.1s Time] [2021-11-23 17:25:09,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53410 states. [2021-11-23 17:25:13,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53410 to 53346. [2021-11-23 17:25:13,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53346 states, 53345 states have (on average 1.2514012559752554) internal successors, (66756), 53345 states have internal predecessors, (66756), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:14,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53346 states to 53346 states and 66756 transitions. [2021-11-23 17:25:14,019 INFO L78 Accepts]: Start accepts. Automaton has 53346 states and 66756 transitions. Word has length 160 [2021-11-23 17:25:14,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:14,019 INFO L470 AbstractCegarLoop]: Abstraction has 53346 states and 66756 transitions. [2021-11-23 17:25:14,019 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 11.5) internal successors, (299), 25 states have internal predecessors, (299), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:14,019 INFO L276 IsEmpty]: Start isEmpty. Operand 53346 states and 66756 transitions. [2021-11-23 17:25:14,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:25:14,027 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:14,027 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-23 17:25:14,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (138)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:14,247 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (140)] Ended with exit code 0 [2021-11-23 17:25:14,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (139)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:14,628 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 138 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,140 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,139 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:14,628 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:14,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:14,628 INFO L85 PathProgramCache]: Analyzing trace with hash -884847060, now seen corresponding path program 1 times [2021-11-23 17:25:14,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:14,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [11395155] [2021-11-23 17:25:14,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:14,629 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:14,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:14,630 INFO L229 MonitoredProcess]: Starting monitored process 141 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:14,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (141)] Waiting until timeout for monitored process [2021-11-23 17:25:14,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:14,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:25:14,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:16,657 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 74 proven. 48 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:25:16,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:17,412 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 74 proven. 48 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:25:17,412 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:17,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [11395155] [2021-11-23 17:25:17,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [11395155] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:17,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [818707488] [2021-11-23 17:25:17,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:17,413 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:17,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:17,414 INFO L229 MonitoredProcess]: Starting monitored process 142 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:17,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (142)] Waiting until timeout for monitored process [2021-11-23 17:25:17,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:17,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:25:17,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:20,684 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 47 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:20,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:21,649 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 47 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:21,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [818707488] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:21,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [135622928] [2021-11-23 17:25:21,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:21,649 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:21,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:21,650 INFO L229 MonitoredProcess]: Starting monitored process 143 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:21,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (143)] Waiting until timeout for monitored process [2021-11-23 17:25:21,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:21,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:25:21,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:24,005 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 47 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:24,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:24,687 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 47 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:24,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [135622928] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:24,687 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:24,688 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 13, 13] total 39 [2021-11-23 17:25:24,688 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191939950] [2021-11-23 17:25:24,688 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:24,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-23 17:25:24,689 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:24,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-23 17:25:24,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1425, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 17:25:24,689 INFO L87 Difference]: Start difference. First operand 53346 states and 66756 transitions. Second operand has 40 states, 40 states have (on average 12.975) internal successors, (519), 39 states have internal predecessors, (519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:36,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:36,096 INFO L93 Difference]: Finished difference Result 77362 states and 97996 transitions. [2021-11-23 17:25:36,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-11-23 17:25:36,096 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 12.975) internal successors, (519), 39 states have internal predecessors, (519), 0 states have call successors, (0), 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 160 [2021-11-23 17:25:36,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:36,177 INFO L225 Difference]: With dead ends: 77362 [2021-11-23 17:25:36,178 INFO L226 Difference]: Without dead ends: 72470 [2021-11-23 17:25:36,189 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1095 GetRequests, 933 SyntacticMatches, 6 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8743 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=1740, Invalid=23066, Unknown=0, NotChecked=0, Total=24806 [2021-11-23 17:25:36,191 INFO L933 BasicCegarLoop]: 272 mSDtfsCounter, 1151 mSDsluCounter, 6022 mSDsCounter, 0 mSdLazyCounter, 1867 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1151 SdHoareTripleChecker+Valid, 6294 SdHoareTripleChecker+Invalid, 5112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 1867 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 3155 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:36,191 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1151 Valid, 6294 Invalid, 5112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 1867 Invalid, 0 Unknown, 3155 Unchecked, 1.2s Time] [2021-11-23 17:25:36,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72470 states. [2021-11-23 17:25:38,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72470 to 23075. [2021-11-23 17:25:38,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23075 states, 23074 states have (on average 1.2395770130883246) internal successors, (28602), 23074 states have internal predecessors, (28602), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:38,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23075 states to 23075 states and 28602 transitions. [2021-11-23 17:25:38,695 INFO L78 Accepts]: Start accepts. Automaton has 23075 states and 28602 transitions. Word has length 160 [2021-11-23 17:25:38,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:38,695 INFO L470 AbstractCegarLoop]: Abstraction has 23075 states and 28602 transitions. [2021-11-23 17:25:38,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 12.975) internal successors, (519), 39 states have internal predecessors, (519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:38,696 INFO L276 IsEmpty]: Start isEmpty. Operand 23075 states and 28602 transitions. [2021-11-23 17:25:38,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-23 17:25:38,701 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:38,701 INFO L514 BasicCegarLoop]: trace histogram [4, 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, 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] [2021-11-23 17:25:38,705 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (142)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:38,908 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (141)] Ended with exit code 0 [2021-11-23 17:25:39,121 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (143)] Ended with exit code 0 [2021-11-23 17:25:39,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 142 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,141 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,143 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:39,302 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:39,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:39,302 INFO L85 PathProgramCache]: Analyzing trace with hash 196057772, now seen corresponding path program 1 times [2021-11-23 17:25:39,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:39,302 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1014831602] [2021-11-23 17:25:39,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:39,302 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:39,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:39,304 INFO L229 MonitoredProcess]: Starting monitored process 144 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:39,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (144)] Waiting until timeout for monitored process [2021-11-23 17:25:39,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:39,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:25:39,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:40,705 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 91 proven. 24 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:25:40,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:41,398 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 91 proven. 24 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 17:25:41,398 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:41,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1014831602] [2021-11-23 17:25:41,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1014831602] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:41,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [721208744] [2021-11-23 17:25:41,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:41,399 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:41,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:41,400 INFO L229 MonitoredProcess]: Starting monitored process 145 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:41,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (145)] Waiting until timeout for monitored process [2021-11-23 17:25:41,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:41,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:25:41,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:45,497 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 38 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:45,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:46,161 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 38 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:46,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [721208744] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:46,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [684824327] [2021-11-23 17:25:46,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:46,161 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:46,161 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:46,162 INFO L229 MonitoredProcess]: Starting monitored process 146 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:46,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (146)] Waiting until timeout for monitored process [2021-11-23 17:25:46,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:46,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:25:46,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:48,577 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 38 proven. 88 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:25:48,577 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:49,350 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 38 proven. 88 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:25:49,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [684824327] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:49,350 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:49,351 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:25:49,351 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232110890] [2021-11-23 17:25:49,351 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:49,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:25:49,352 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:49,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:25:49,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:25:49,352 INFO L87 Difference]: Start difference. First operand 23075 states and 28602 transitions. Second operand has 48 states, 48 states have (on average 15.479166666666666) internal successors, (743), 47 states have internal predecessors, (743), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:57,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:57,566 INFO L93 Difference]: Finished difference Result 36993 states and 45383 transitions. [2021-11-23 17:25:57,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-11-23 17:25:57,567 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 15.479166666666666) internal successors, (743), 47 states have internal predecessors, (743), 0 states have call successors, (0), 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 160 [2021-11-23 17:25:57,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:57,599 INFO L225 Difference]: With dead ends: 36993 [2021-11-23 17:25:57,599 INFO L226 Difference]: Without dead ends: 30541 [2021-11-23 17:25:57,606 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1080 GetRequests, 931 SyntacticMatches, 3 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7320 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=1634, Invalid=20122, Unknown=0, NotChecked=0, Total=21756 [2021-11-23 17:25:57,606 INFO L933 BasicCegarLoop]: 213 mSDtfsCounter, 943 mSDsluCounter, 4854 mSDsCounter, 0 mSdLazyCounter, 786 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 943 SdHoareTripleChecker+Valid, 5067 SdHoareTripleChecker+Invalid, 1913 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 786 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1068 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:57,606 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [943 Valid, 5067 Invalid, 1913 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 786 Invalid, 0 Unknown, 1068 Unchecked, 0.6s Time] [2021-11-23 17:25:57,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30541 states. [2021-11-23 17:25:59,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30541 to 11588. [2021-11-23 17:25:59,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11588 states, 11587 states have (on average 1.2185207560196771) internal successors, (14119), 11587 states have internal predecessors, (14119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:59,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11588 states to 11588 states and 14119 transitions. [2021-11-23 17:25:59,032 INFO L78 Accepts]: Start accepts. Automaton has 11588 states and 14119 transitions. Word has length 160 [2021-11-23 17:25:59,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:59,032 INFO L470 AbstractCegarLoop]: Abstraction has 11588 states and 14119 transitions. [2021-11-23 17:25:59,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 15.479166666666666) internal successors, (743), 47 states have internal predecessors, (743), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:25:59,033 INFO L276 IsEmpty]: Start isEmpty. Operand 11588 states and 14119 transitions. [2021-11-23 17:25:59,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-23 17:25:59,035 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:59,035 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:25:59,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (144)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:59,237 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (145)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:59,457 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (146)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:59,636 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 144 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,145 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,146 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:59,636 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:59,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:59,636 INFO L85 PathProgramCache]: Analyzing trace with hash 1406369718, now seen corresponding path program 1 times [2021-11-23 17:25:59,637 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:59,637 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [508296794] [2021-11-23 17:25:59,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:59,637 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:59,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:59,638 INFO L229 MonitoredProcess]: Starting monitored process 147 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:59,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (147)] Waiting until timeout for monitored process [2021-11-23 17:25:59,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:59,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:25:59,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:02,200 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 16 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:02,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:02,871 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 16 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:02,871 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:26:02,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [508296794] [2021-11-23 17:26:02,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [508296794] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:02,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [154461938] [2021-11-23 17:26:02,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:02,871 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:26:02,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:26:02,872 INFO L229 MonitoredProcess]: Starting monitored process 148 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:26:02,873 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (148)] Waiting until timeout for monitored process [2021-11-23 17:26:03,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:03,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:26:03,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:06,058 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 16 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:06,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:06,704 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 16 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:06,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [154461938] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:06,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463985500] [2021-11-23 17:26:06,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:06,704 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:06,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:26:06,705 INFO L229 MonitoredProcess]: Starting monitored process 149 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:26:06,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (149)] Waiting until timeout for monitored process [2021-11-23 17:26:06,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:06,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:26:06,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:09,268 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 16 proven. 102 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:26:09,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:10,273 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 16 proven. 102 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:26:10,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463985500] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:10,273 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:26:10,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:26:10,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666441327] [2021-11-23 17:26:10,273 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:26:10,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:26:10,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:26:10,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:26:10,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:26:10,275 INFO L87 Difference]: Start difference. First operand 11588 states and 14119 transitions. Second operand has 34 states, 34 states have (on average 15.735294117647058) internal successors, (535), 33 states have internal predecessors, (535), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:26:11,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:26:11,931 INFO L93 Difference]: Finished difference Result 13828 states and 16845 transitions. [2021-11-23 17:26:11,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:26:11,931 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 15.735294117647058) internal successors, (535), 33 states have internal predecessors, (535), 0 states have call successors, (0), 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 161 [2021-11-23 17:26:11,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:26:11,944 INFO L225 Difference]: With dead ends: 13828 [2021-11-23 17:26:11,944 INFO L226 Difference]: Without dead ends: 11776 [2021-11-23 17:26:11,948 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 973 GetRequests, 931 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=255, Invalid=1637, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:26:11,948 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 203 mSDsluCounter, 2099 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 2223 SdHoareTripleChecker+Invalid, 246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 168 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:26:11,948 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [203 Valid, 2223 Invalid, 246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 72 Invalid, 0 Unknown, 168 Unchecked, 0.1s Time] [2021-11-23 17:26:11,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11776 states. [2021-11-23 17:26:13,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11776 to 11572. [2021-11-23 17:26:13,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11572 states, 11571 states have (on average 1.2163166537032235) internal successors, (14074), 11571 states have internal predecessors, (14074), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:26:13,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11572 states to 11572 states and 14074 transitions. [2021-11-23 17:26:13,314 INFO L78 Accepts]: Start accepts. Automaton has 11572 states and 14074 transitions. Word has length 161 [2021-11-23 17:26:13,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:26:13,315 INFO L470 AbstractCegarLoop]: Abstraction has 11572 states and 14074 transitions. [2021-11-23 17:26:13,315 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 15.735294117647058) internal successors, (535), 33 states have internal predecessors, (535), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:26:13,315 INFO L276 IsEmpty]: Start isEmpty. Operand 11572 states and 14074 transitions. [2021-11-23 17:26:13,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-23 17:26:13,317 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:26:13,318 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:26:13,322 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (148)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:13,525 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (147)] Ended with exit code 0 [2021-11-23 17:26:13,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (149)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:13,918 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 148 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,147 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,149 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:13,918 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:26:13,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:26:13,919 INFO L85 PathProgramCache]: Analyzing trace with hash -297819722, now seen corresponding path program 1 times [2021-11-23 17:26:13,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:26:13,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1515835120] [2021-11-23 17:26:13,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:13,919 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:26:13,920 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:26:13,920 INFO L229 MonitoredProcess]: Starting monitored process 150 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:26:13,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (150)] Waiting until timeout for monitored process [2021-11-23 17:26:14,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:14,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:26:14,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:16,743 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:16,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:17,487 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:17,488 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:26:17,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1515835120] [2021-11-23 17:26:17,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1515835120] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:17,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [567873296] [2021-11-23 17:26:17,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:17,488 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:26:17,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:26:17,489 INFO L229 MonitoredProcess]: Starting monitored process 151 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:26:17,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (151)] Waiting until timeout for monitored process [2021-11-23 17:26:17,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:17,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:26:17,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:20,362 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:20,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:20,790 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:20,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [567873296] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:20,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [541816068] [2021-11-23 17:26:20,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:20,791 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:20,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:26:20,817 INFO L229 MonitoredProcess]: Starting monitored process 152 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:26:20,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (152)] Waiting until timeout for monitored process [2021-11-23 17:26:20,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:20,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:26:20,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:23,104 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 95 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:26:23,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:23,982 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 24 proven. 95 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:26:23,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [541816068] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:23,982 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:26:23,983 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:26:23,983 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681068234] [2021-11-23 17:26:23,983 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:26:23,984 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:26:23,984 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:26:23,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:26:23,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:26:23,984 INFO L87 Difference]: Start difference. First operand 11572 states and 14074 transitions. Second operand has 34 states, 34 states have (on average 15.529411764705882) internal successors, (528), 33 states have internal predecessors, (528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:26:25,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:26:25,553 INFO L93 Difference]: Finished difference Result 14998 states and 18256 transitions. [2021-11-23 17:26:25,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:26:25,553 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 15.529411764705882) internal successors, (528), 33 states have internal predecessors, (528), 0 states have call successors, (0), 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 161 [2021-11-23 17:26:25,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:26:25,565 INFO L225 Difference]: With dead ends: 14998 [2021-11-23 17:26:25,565 INFO L226 Difference]: Without dead ends: 11620 [2021-11-23 17:26:25,569 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 973 GetRequests, 931 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=255, Invalid=1637, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:26:25,570 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 271 mSDsluCounter, 1647 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 271 SdHoareTripleChecker+Valid, 1767 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 156 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:26:25,570 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [271 Valid, 1767 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 80 Invalid, 0 Unknown, 156 Unchecked, 0.1s Time] [2021-11-23 17:26:25,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11620 states. [2021-11-23 17:26:27,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11620 to 11572. [2021-11-23 17:26:27,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11572 states, 11571 states have (on average 1.2163166537032235) internal successors, (14074), 11571 states have internal predecessors, (14074), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:26:27,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11572 states to 11572 states and 14074 transitions. [2021-11-23 17:26:27,021 INFO L78 Accepts]: Start accepts. Automaton has 11572 states and 14074 transitions. Word has length 161 [2021-11-23 17:26:27,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:26:27,021 INFO L470 AbstractCegarLoop]: Abstraction has 11572 states and 14074 transitions. [2021-11-23 17:26:27,021 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 15.529411764705882) internal successors, (528), 33 states have internal predecessors, (528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:26:27,022 INFO L276 IsEmpty]: Start isEmpty. Operand 11572 states and 14074 transitions. [2021-11-23 17:26:27,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-23 17:26:27,024 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:26:27,024 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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 17:26:27,028 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (151)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:27,235 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (150)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:27,445 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (152)] Ended with exit code 0 [2021-11-23 17:26:27,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 151 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,150 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,152 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:27,625 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:26:27,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:26:27,625 INFO L85 PathProgramCache]: Analyzing trace with hash -2126907529, now seen corresponding path program 1 times [2021-11-23 17:26:27,626 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:26:27,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1890791213] [2021-11-23 17:26:27,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:27,626 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:26:27,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:26:27,627 INFO L229 MonitoredProcess]: Starting monitored process 153 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:26:27,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (153)] Waiting until timeout for monitored process [2021-11-23 17:26:27,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:27,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:26:27,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:29,839 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 24 proven. 66 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 17:26:29,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:30,561 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 24 proven. 66 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 17:26:30,561 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:26:30,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1890791213] [2021-11-23 17:26:30,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1890791213] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:30,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [470906972] [2021-11-23 17:26:30,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:30,561 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:26:30,561 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:26:30,562 INFO L229 MonitoredProcess]: Starting monitored process 154 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:26:30,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (154)] Waiting until timeout for monitored process [2021-11-23 17:26:30,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:30,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:26:30,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:33,139 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 24 proven. 66 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 17:26:33,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:33,839 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 24 proven. 66 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 17:26:33,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [470906972] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:33,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [86883139] [2021-11-23 17:26:33,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:33,839 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:33,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:26:33,840 INFO L229 MonitoredProcess]: Starting monitored process 155 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:26:33,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0f8d91e4-d880-4769-9b91-1f3010e25dba/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (155)] Waiting until timeout for monitored process [2021-11-23 17:26:33,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:33,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:26:33,923 INFO L286 TraceCheckSpWp]: Computing forward predicates...