./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4.ufo.UNBOUNDED.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_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/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_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/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_6d778df8-32cf-46e6-8d9d-2abab036fb88/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 52f795f47ad9dd0b1b0499f649b5f623fed211e53433ed6d87534c63dbfae98b --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:37:49,450 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:37:49,452 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:37:49,492 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:37:49,493 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:37:49,495 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:37:49,497 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:37:49,500 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:37:49,503 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:37:49,504 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:37:49,506 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:37:49,508 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:37:49,509 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:37:49,510 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:37:49,512 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:37:49,515 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:37:49,519 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:37:49,524 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:37:49,527 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:37:49,533 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:37:49,539 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:37:49,545 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:37:49,547 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:37:49,549 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:37:49,554 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:37:49,557 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:37:49,558 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:37:49,560 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:37:49,561 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:37:49,563 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:37:49,565 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:37:49,566 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:37:49,569 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:37:49,570 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:37:49,572 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:37:49,573 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:37:49,574 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:37:49,574 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:37:49,574 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:37:49,576 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:37:49,577 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:37:49,578 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:37:49,640 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:37:49,642 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:37:49,643 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:37:49,643 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:37:49,652 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:37:49,652 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:37:49,653 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:37:49,653 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:37:49,653 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:37:49,653 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:37:49,655 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:37:49,655 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:37:49,656 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:37:49,656 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:37:49,656 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:37:49,657 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:37:49,657 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:37:49,657 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:37:49,659 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:37:49,661 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:37:49,661 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:37:49,668 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:37:49,668 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:37:49,669 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:37:49,669 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:37:49,669 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:37:49,670 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:37:49,670 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:37:49,670 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:37:49,670 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:37:49,671 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:37:49,672 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:37:49,672 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:37:49,672 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:37:49,675 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:37:49,675 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:37:49,676 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:37:49,676 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:37:49,676 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:37:49,676 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:37:49,677 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:37:49,677 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_6d778df8-32cf-46e6-8d9d-2abab036fb88/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 52f795f47ad9dd0b1b0499f649b5f623fed211e53433ed6d87534c63dbfae98b [2021-11-23 17:37:50,041 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:37:50,076 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:37:50,079 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:37:50,081 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:37:50,082 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:37:50,084 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4.ufo.UNBOUNDED.pals.c [2021-11-23 17:37:50,171 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/data/ae584d860/dde0d86a42014a64902db891412e7a87/FLAGe35f4878c [2021-11-23 17:37:50,817 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:37:50,818 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.ufo.UNBOUNDED.pals.c [2021-11-23 17:37:50,839 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/data/ae584d860/dde0d86a42014a64902db891412e7a87/FLAGe35f4878c [2021-11-23 17:37:51,131 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/data/ae584d860/dde0d86a42014a64902db891412e7a87 [2021-11-23 17:37:51,134 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:37:51,136 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:37:51,138 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:37:51,138 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:37:51,143 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:37:51,144 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:37:51" (1/1) ... [2021-11-23 17:37:51,145 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5c75e70c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:51, skipping insertion in model container [2021-11-23 17:37:51,145 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:37:51" (1/1) ... [2021-11-23 17:37:51,157 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:37:51,191 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:37:51,439 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_6d778df8-32cf-46e6-8d9d-2abab036fb88/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.ufo.UNBOUNDED.pals.c[8305,8318] [2021-11-23 17:37:51,442 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:37:51,454 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:37:51,527 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_6d778df8-32cf-46e6-8d9d-2abab036fb88/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.ufo.UNBOUNDED.pals.c[8305,8318] [2021-11-23 17:37:51,528 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:37:51,554 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:37:51,555 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:51 WrapperNode [2021-11-23 17:37:51,556 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:37:51,557 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:37:51,562 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:37:51,562 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:37:51,572 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:51" (1/1) ... [2021-11-23 17:37:51,585 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:51" (1/1) ... [2021-11-23 17:37:51,625 INFO L137 Inliner]: procedures = 24, calls = 15, calls flagged for inlining = 10, calls inlined = 10, statements flattened = 274 [2021-11-23 17:37:51,634 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:37:51,635 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:37:51,635 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:37:51,636 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:37:51,645 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:51" (1/1) ... [2021-11-23 17:37:51,645 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:51" (1/1) ... [2021-11-23 17:37:51,649 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:51" (1/1) ... [2021-11-23 17:37:51,650 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:51" (1/1) ... [2021-11-23 17:37:51,658 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:51" (1/1) ... [2021-11-23 17:37:51,690 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:51" (1/1) ... [2021-11-23 17:37:51,693 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:51" (1/1) ... [2021-11-23 17:37:51,697 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:37:51,711 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:37:51,711 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:37:51,711 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:37:51,712 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:51" (1/1) ... [2021-11-23 17:37:51,727 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:37:51,741 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:51,756 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:37:51,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:37:51,796 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:37:51,796 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:37:51,796 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:37:51,796 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:37:51,888 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:37:51,889 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:37:52,447 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:37:52,517 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 17:37:52,524 INFO L158 Benchmark]: Toolchain (without parser) took 1386.45ms. Allocated memory was 88.1MB in the beginning and 111.1MB in the end (delta: 23.1MB). Free memory was 48.7MB in the beginning and 83.3MB in the end (delta: -34.6MB). Peak memory consumption was 14.8MB. Max. memory is 16.1GB. [2021-11-23 17:37:52,525 INFO L158 Benchmark]: CDTParser took 0.33ms. Allocated memory is still 88.1MB. Free memory was 65.2MB in the beginning and 65.1MB in the end (delta: 84.0kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:37:52,526 INFO L158 Benchmark]: CACSL2BoogieTranslator took 418.16ms. Allocated memory was 88.1MB in the beginning and 111.1MB in the end (delta: 23.1MB). Free memory was 48.4MB in the beginning and 82.9MB in the end (delta: -34.5MB). Peak memory consumption was 8.5MB. Max. memory is 16.1GB. [2021-11-23 17:37:52,527 INFO L158 Benchmark]: Boogie Procedure Inliner took 77.34ms. Allocated memory is still 111.1MB. Free memory was 82.9MB in the beginning and 80.8MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:37:52,528 INFO L158 Benchmark]: Boogie Preprocessor took 62.39ms. Allocated memory is still 111.1MB. Free memory was 80.8MB in the beginning and 79.1MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:37:52,529 INFO L158 Benchmark]: RCFGBuilder took 809.49ms. Allocated memory is still 111.1MB. Free memory was 79.1MB in the beginning and 83.3MB in the end (delta: -4.2MB). Peak memory consumption was 21.0MB. Max. memory is 16.1GB. [2021-11-23 17:37:52,532 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.33ms. Allocated memory is still 88.1MB. Free memory was 65.2MB in the beginning and 65.1MB in the end (delta: 84.0kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 418.16ms. Allocated memory was 88.1MB in the beginning and 111.1MB in the end (delta: 23.1MB). Free memory was 48.4MB in the beginning and 82.9MB in the end (delta: -34.5MB). Peak memory consumption was 8.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 77.34ms. Allocated memory is still 111.1MB. Free memory was 82.9MB in the beginning and 80.8MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 62.39ms. Allocated memory is still 111.1MB. Free memory was 80.8MB in the beginning and 79.1MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 809.49ms. Allocated memory is still 111.1MB. Free memory was 79.1MB in the beginning and 83.3MB in the end (delta: -4.2MB). Peak memory consumption was 21.0MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 17:37:52,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/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_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/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_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/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_6d778df8-32cf-46e6-8d9d-2abab036fb88/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 52f795f47ad9dd0b1b0499f649b5f623fed211e53433ed6d87534c63dbfae98b --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:37:55,437 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:37:55,441 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:37:55,503 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:37:55,504 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:37:55,510 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:37:55,512 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:37:55,517 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:37:55,521 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:37:55,532 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:37:55,534 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:37:55,536 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:37:55,537 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:37:55,540 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:37:55,543 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:37:55,548 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:37:55,551 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:37:55,553 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:37:55,555 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:37:55,565 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:37:55,567 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:37:55,569 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:37:55,572 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:37:55,575 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:37:55,585 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:37:55,586 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:37:55,586 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:37:55,589 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:37:55,590 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:37:55,591 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:37:55,591 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:37:55,593 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:37:55,595 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:37:55,596 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:37:55,598 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:37:55,598 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:37:55,599 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:37:55,622 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:37:55,622 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:37:55,625 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:37:55,626 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:37:55,632 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:37:55,685 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:37:55,685 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:37:55,686 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:37:55,687 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:37:55,688 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:37:55,688 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:37:55,688 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:37:55,689 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:37:55,689 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:37:55,689 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:37:55,691 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:37:55,691 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:37:55,693 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:37:55,693 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:37:55,693 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:37:55,694 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:37:55,694 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:37:55,694 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:37:55,694 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:37:55,695 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:37:55,695 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:37:55,695 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:37:55,696 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:37:55,696 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:37:55,696 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:37:55,696 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:37:55,697 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:37:55,697 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:37:55,697 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:37:55,698 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:37:55,698 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:37:55,698 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:37:55,699 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:37:55,700 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:37:55,700 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:55,700 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:37:55,700 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:37:55,701 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:37:55,701 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_6d778df8-32cf-46e6-8d9d-2abab036fb88/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 52f795f47ad9dd0b1b0499f649b5f623fed211e53433ed6d87534c63dbfae98b [2021-11-23 17:37:56,156 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:37:56,191 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:37:56,194 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:37:56,195 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:37:56,196 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:37:56,197 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4.ufo.UNBOUNDED.pals.c [2021-11-23 17:37:56,284 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/data/f76360537/04f5acb2111c4fa68f231eb49ab16f28/FLAGb3e7d0c00 [2021-11-23 17:37:56,953 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:37:56,956 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.ufo.UNBOUNDED.pals.c [2021-11-23 17:37:56,970 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/data/f76360537/04f5acb2111c4fa68f231eb49ab16f28/FLAGb3e7d0c00 [2021-11-23 17:37:57,293 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/data/f76360537/04f5acb2111c4fa68f231eb49ab16f28 [2021-11-23 17:37:57,296 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:37:57,298 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:37:57,314 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:37:57,315 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:37:57,319 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:37:57,320 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:37:57" (1/1) ... [2021-11-23 17:37:57,321 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5b753aee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:57, skipping insertion in model container [2021-11-23 17:37:57,321 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:37:57" (1/1) ... [2021-11-23 17:37:57,330 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:37:57,365 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:37:57,647 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_6d778df8-32cf-46e6-8d9d-2abab036fb88/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.ufo.UNBOUNDED.pals.c[8305,8318] [2021-11-23 17:37:57,650 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:37:57,664 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:37:57,721 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_6d778df8-32cf-46e6-8d9d-2abab036fb88/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.ufo.UNBOUNDED.pals.c[8305,8318] [2021-11-23 17:37:57,722 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:37:57,741 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:37:57,741 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:57 WrapperNode [2021-11-23 17:37:57,742 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:37:57,743 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:37:57,743 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:37:57,744 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:37:57,752 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:57" (1/1) ... [2021-11-23 17:37:57,769 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:57" (1/1) ... [2021-11-23 17:37:57,806 INFO L137 Inliner]: procedures = 24, calls = 15, calls flagged for inlining = 10, calls inlined = 10, statements flattened = 260 [2021-11-23 17:37:57,807 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:37:57,808 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:37:57,808 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:37:57,808 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:37:57,819 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:57" (1/1) ... [2021-11-23 17:37:57,819 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:57" (1/1) ... [2021-11-23 17:37:57,825 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:57" (1/1) ... [2021-11-23 17:37:57,825 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:57" (1/1) ... [2021-11-23 17:37:57,836 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:57" (1/1) ... [2021-11-23 17:37:57,843 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:57" (1/1) ... [2021-11-23 17:37:57,846 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:57" (1/1) ... [2021-11-23 17:37:57,851 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:37:57,853 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:37:57,853 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:37:57,853 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:37:57,854 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:57" (1/1) ... [2021-11-23 17:37:57,862 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:37:57,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:57,891 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:37:57,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:37:57,943 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:37:57,944 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:37:57,944 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:37:57,944 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:37:58,044 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:37:58,046 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:37:58,438 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:37:58,448 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:37:58,448 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 17:37:58,451 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:37:58 BoogieIcfgContainer [2021-11-23 17:37:58,451 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:37:58,453 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:37:58,454 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:37:58,457 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:37:58,458 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:37:57" (1/3) ... [2021-11-23 17:37:58,459 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79d3180c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:37:58, skipping insertion in model container [2021-11-23 17:37:58,459 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:37:57" (2/3) ... [2021-11-23 17:37:58,460 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79d3180c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:37:58, skipping insertion in model container [2021-11-23 17:37:58,460 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:37:58" (3/3) ... [2021-11-23 17:37:58,462 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.4.ufo.UNBOUNDED.pals.c [2021-11-23 17:37:58,468 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:37:58,469 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:37:58,529 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:37:58,537 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 17:37:58,537 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:37:58,564 INFO L276 IsEmpty]: Start isEmpty. Operand has 79 states, 77 states have (on average 1.7012987012987013) internal successors, (131), 78 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:58,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 17:37:58,573 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:58,574 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] [2021-11-23 17:37:58,575 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:58,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:58,591 INFO L85 PathProgramCache]: Analyzing trace with hash -171388107, now seen corresponding path program 1 times [2021-11-23 17:37:58,610 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:58,612 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1305975319] [2021-11-23 17:37:58,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:58,614 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:58,614 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:58,624 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:58,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:37:58,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:58,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 17:37:58,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:59,004 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:59,004 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:37:59,005 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:59,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1305975319] [2021-11-23 17:37:59,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1305975319] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:37:59,006 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:37:59,007 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:37:59,009 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027664330] [2021-11-23 17:37:59,010 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:37:59,015 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 17:37:59,015 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:59,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 17:37:59,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:37:59,079 INFO L87 Difference]: Start difference. First operand has 79 states, 77 states have (on average 1.7012987012987013) internal successors, (131), 78 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 14.5) internal successors, (29), 2 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:59,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:59,131 INFO L93 Difference]: Finished difference Result 126 states and 207 transitions. [2021-11-23 17:37:59,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 17:37:59,134 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 14.5) internal successors, (29), 2 states have internal predecessors, (29), 0 states have call successors, (0), 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 29 [2021-11-23 17:37:59,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:59,148 INFO L225 Difference]: With dead ends: 126 [2021-11-23 17:37:59,148 INFO L226 Difference]: Without dead ends: 75 [2021-11-23 17:37:59,152 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 28 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 17:37:59,159 INFO L933 BasicCegarLoop]: 124 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, 124 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 17:37:59,161 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:37:59,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-23 17:37:59,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-23 17:37:59,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.6756756756756757) internal successors, (124), 74 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:59,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 124 transitions. [2021-11-23 17:37:59,228 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 124 transitions. Word has length 29 [2021-11-23 17:37:59,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:59,228 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 124 transitions. [2021-11-23 17:37:59,229 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 14.5) internal successors, (29), 2 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:59,229 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 124 transitions. [2021-11-23 17:37:59,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 17:37:59,232 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:59,233 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] [2021-11-23 17:37:59,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:59,447 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:37:59,447 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:59,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:59,453 INFO L85 PathProgramCache]: Analyzing trace with hash -305401613, now seen corresponding path program 1 times [2021-11-23 17:37:59,454 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:59,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [29241686] [2021-11-23 17:37:59,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:59,456 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:59,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:59,458 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:59,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:37:59,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:59,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:37:59,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:59,723 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 17:37:59,724 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:37:59,724 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:59,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [29241686] [2021-11-23 17:37:59,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [29241686] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:37:59,725 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:37:59,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:37:59,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183151073] [2021-11-23 17:37:59,726 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:37:59,727 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:37:59,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:59,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:37:59,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:37:59,729 INFO L87 Difference]: Start difference. First operand 75 states and 124 transitions. Second operand has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:59,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:59,876 INFO L93 Difference]: Finished difference Result 125 states and 200 transitions. [2021-11-23 17:37:59,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:37:59,880 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 0 states have call successors, (0), 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 29 [2021-11-23 17:37:59,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:59,882 INFO L225 Difference]: With dead ends: 125 [2021-11-23 17:37:59,882 INFO L226 Difference]: Without dead ends: 75 [2021-11-23 17:37:59,883 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 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 17:37:59,885 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 3 mSDsluCounter, 340 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 462 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:59,886 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 462 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:37:59,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-23 17:37:59,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-23 17:37:59,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.364864864864865) internal successors, (101), 74 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:59,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 101 transitions. [2021-11-23 17:37:59,912 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 101 transitions. Word has length 29 [2021-11-23 17:37:59,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:59,913 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 101 transitions. [2021-11-23 17:37:59,913 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:37:59,913 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 101 transitions. [2021-11-23 17:37:59,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 17:37:59,915 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:59,916 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] [2021-11-23 17:37:59,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:00,133 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:00,134 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:00,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:00,135 INFO L85 PathProgramCache]: Analyzing trace with hash -1295954354, now seen corresponding path program 1 times [2021-11-23 17:38:00,135 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:00,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [963590038] [2021-11-23 17:38:00,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:00,136 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:00,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:00,137 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:00,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:38:00,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:00,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:38:00,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:00,513 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 17:38:00,513 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:00,513 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:00,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [963590038] [2021-11-23 17:38:00,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [963590038] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:00,515 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:00,516 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:38:00,521 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384146777] [2021-11-23 17:38:00,522 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:00,522 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:38:00,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:00,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:38:00,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:38:00,524 INFO L87 Difference]: Start difference. First operand 75 states and 101 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:00,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:00,571 INFO L93 Difference]: Finished difference Result 161 states and 235 transitions. [2021-11-23 17:38:00,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:38:00,574 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 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 51 [2021-11-23 17:38:00,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:00,576 INFO L225 Difference]: With dead ends: 161 [2021-11-23 17:38:00,576 INFO L226 Difference]: Without dead ends: 115 [2021-11-23 17:38:00,576 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 49 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 17:38:00,578 INFO L933 BasicCegarLoop]: 143 mSDtfsCounter, 58 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 217 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 17:38:00,578 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 217 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:38:00,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-23 17:38:00,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 113. [2021-11-23 17:38:00,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.4375) internal successors, (161), 112 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:00,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 161 transitions. [2021-11-23 17:38:00,593 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 161 transitions. Word has length 51 [2021-11-23 17:38:00,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:00,593 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 161 transitions. [2021-11-23 17:38:00,594 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:00,594 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 161 transitions. [2021-11-23 17:38:00,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 17:38:00,596 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:00,596 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] [2021-11-23 17:38:00,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:00,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:00,809 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:00,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:00,810 INFO L85 PathProgramCache]: Analyzing trace with hash 1404728260, now seen corresponding path program 1 times [2021-11-23 17:38:00,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:00,811 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1790895812] [2021-11-23 17:38:00,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:00,811 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:00,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:00,813 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:00,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:38:00,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:00,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:38:00,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:01,126 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 17:38:01,126 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:01,126 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:01,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1790895812] [2021-11-23 17:38:01,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1790895812] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:01,127 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:01,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:38:01,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341398890] [2021-11-23 17:38:01,128 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:01,129 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:38:01,129 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:01,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:38:01,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:38:01,130 INFO L87 Difference]: Start difference. First operand 113 states and 161 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:01,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:01,152 INFO L93 Difference]: Finished difference Result 269 states and 405 transitions. [2021-11-23 17:38:01,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:38:01,153 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 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 51 [2021-11-23 17:38:01,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:01,156 INFO L225 Difference]: With dead ends: 269 [2021-11-23 17:38:01,156 INFO L226 Difference]: Without dead ends: 185 [2021-11-23 17:38:01,157 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 49 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 17:38:01,159 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 54 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 216 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 17:38:01,160 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 216 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:38:01,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-11-23 17:38:01,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 183. [2021-11-23 17:38:01,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 182 states have (on average 1.4835164835164836) internal successors, (270), 182 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:01,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 270 transitions. [2021-11-23 17:38:01,181 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 270 transitions. Word has length 51 [2021-11-23 17:38:01,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:01,181 INFO L470 AbstractCegarLoop]: Abstraction has 183 states and 270 transitions. [2021-11-23 17:38:01,182 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:01,182 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 270 transitions. [2021-11-23 17:38:01,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 17:38:01,184 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:01,184 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] [2021-11-23 17:38:01,200 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:01,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:01,397 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:01,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:01,398 INFO L85 PathProgramCache]: Analyzing trace with hash 1742521402, now seen corresponding path program 1 times [2021-11-23 17:38:01,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:01,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1596360545] [2021-11-23 17:38:01,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:01,399 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:01,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:01,401 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:01,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:38:01,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:01,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:38:01,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:02,329 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 17:38:02,330 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:02,330 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:02,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1596360545] [2021-11-23 17:38:02,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1596360545] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:02,331 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:02,331 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:38:02,331 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222474858] [2021-11-23 17:38:02,331 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:02,332 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:38:02,332 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:02,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:38:02,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:02,333 INFO L87 Difference]: Start difference. First operand 183 states and 270 transitions. Second operand has 6 states, 6 states have (on average 8.5) internal successors, (51), 6 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:02,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:02,535 INFO L93 Difference]: Finished difference Result 953 states and 1475 transitions. [2021-11-23 17:38:02,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:38:02,536 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.5) internal successors, (51), 6 states have internal predecessors, (51), 0 states have call successors, (0), 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 51 [2021-11-23 17:38:02,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:02,551 INFO L225 Difference]: With dead ends: 953 [2021-11-23 17:38:02,552 INFO L226 Difference]: Without dead ends: 799 [2021-11-23 17:38:02,557 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:02,562 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 561 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 561 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:02,563 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [561 Valid, 375 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:38:02,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 799 states. [2021-11-23 17:38:02,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 799 to 487. [2021-11-23 17:38:02,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 1.5185185185185186) internal successors, (738), 486 states have internal predecessors, (738), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:02,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 738 transitions. [2021-11-23 17:38:02,665 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 738 transitions. Word has length 51 [2021-11-23 17:38:02,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:02,666 INFO L470 AbstractCegarLoop]: Abstraction has 487 states and 738 transitions. [2021-11-23 17:38:02,666 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.5) internal successors, (51), 6 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:02,667 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 738 transitions. [2021-11-23 17:38:02,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 17:38:02,676 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:02,676 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] [2021-11-23 17:38:02,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:02,890 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:02,890 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:02,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:02,891 INFO L85 PathProgramCache]: Analyzing trace with hash -1889876246, now seen corresponding path program 1 times [2021-11-23 17:38:02,891 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:02,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [367032360] [2021-11-23 17:38:02,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:02,893 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:02,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:02,895 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:02,897 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:38:02,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:02,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:38:02,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:03,162 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 17:38:03,162 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:03,162 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:03,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [367032360] [2021-11-23 17:38:03,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [367032360] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:03,163 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:03,163 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:38:03,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475669270] [2021-11-23 17:38:03,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:03,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:38:03,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:03,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:38:03,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:38:03,166 INFO L87 Difference]: Start difference. First operand 487 states and 738 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:03,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:03,246 INFO L93 Difference]: Finished difference Result 1339 states and 2044 transitions. [2021-11-23 17:38:03,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:38:03,246 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 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 53 [2021-11-23 17:38:03,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:03,256 INFO L225 Difference]: With dead ends: 1339 [2021-11-23 17:38:03,257 INFO L226 Difference]: Without dead ends: 881 [2021-11-23 17:38:03,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 51 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 17:38:03,264 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 41 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:03,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 162 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:38:03,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 881 states. [2021-11-23 17:38:03,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 881 to 867. [2021-11-23 17:38:03,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 867 states, 866 states have (on average 1.489607390300231) internal successors, (1290), 866 states have internal predecessors, (1290), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:03,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1290 transitions. [2021-11-23 17:38:03,331 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1290 transitions. Word has length 53 [2021-11-23 17:38:03,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:03,332 INFO L470 AbstractCegarLoop]: Abstraction has 867 states and 1290 transitions. [2021-11-23 17:38:03,333 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:03,333 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1290 transitions. [2021-11-23 17:38:03,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 17:38:03,336 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:03,336 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] [2021-11-23 17:38:03,359 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:03,560 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:03,560 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:03,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:03,561 INFO L85 PathProgramCache]: Analyzing trace with hash -34468658, now seen corresponding path program 1 times [2021-11-23 17:38:03,561 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:03,561 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [478848437] [2021-11-23 17:38:03,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:03,562 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:03,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:03,563 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:03,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:38:03,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:03,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:38:03,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:03,761 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 17:38:03,761 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:03,762 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:03,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [478848437] [2021-11-23 17:38:03,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [478848437] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:03,762 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:03,762 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:38:03,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924561788] [2021-11-23 17:38:03,763 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:03,763 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:38:03,763 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:03,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:38:03,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:38:03,764 INFO L87 Difference]: Start difference. First operand 867 states and 1290 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:03,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:03,868 INFO L93 Difference]: Finished difference Result 2399 states and 3572 transitions. [2021-11-23 17:38:03,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:38:03,869 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 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 53 [2021-11-23 17:38:03,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:03,881 INFO L225 Difference]: With dead ends: 2399 [2021-11-23 17:38:03,883 INFO L226 Difference]: Without dead ends: 1561 [2021-11-23 17:38:03,885 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 51 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 17:38:03,887 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 50 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 216 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 17:38:03,888 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 216 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:38:03,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1561 states. [2021-11-23 17:38:04,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1561 to 1559. [2021-11-23 17:38:04,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1559 states, 1558 states have (on average 1.467265725288832) internal successors, (2286), 1558 states have internal predecessors, (2286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:04,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1559 states to 1559 states and 2286 transitions. [2021-11-23 17:38:04,013 INFO L78 Accepts]: Start accepts. Automaton has 1559 states and 2286 transitions. Word has length 53 [2021-11-23 17:38:04,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:04,013 INFO L470 AbstractCegarLoop]: Abstraction has 1559 states and 2286 transitions. [2021-11-23 17:38:04,014 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:04,014 INFO L276 IsEmpty]: Start isEmpty. Operand 1559 states and 2286 transitions. [2021-11-23 17:38:04,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 17:38:04,016 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:04,016 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:04,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:04,232 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:04,232 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:04,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:04,233 INFO L85 PathProgramCache]: Analyzing trace with hash -1105013027, now seen corresponding path program 1 times [2021-11-23 17:38:04,233 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:04,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [506397234] [2021-11-23 17:38:04,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:04,234 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:04,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:04,235 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:04,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:38:04,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:04,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:38:04,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:04,427 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 17:38:04,427 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:04,427 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:04,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [506397234] [2021-11-23 17:38:04,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [506397234] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:04,428 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:04,428 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:38:04,429 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002875199] [2021-11-23 17:38:04,429 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:04,429 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:38:04,430 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:04,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:38:04,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:38:04,431 INFO L87 Difference]: Start difference. First operand 1559 states and 2286 transitions. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:04,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:04,689 INFO L93 Difference]: Finished difference Result 2834 states and 4117 transitions. [2021-11-23 17:38:04,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:38:04,690 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-23 17:38:04,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:04,710 INFO L225 Difference]: With dead ends: 2834 [2021-11-23 17:38:04,710 INFO L226 Difference]: Without dead ends: 2832 [2021-11-23 17:38:04,711 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 51 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 17:38:04,713 INFO L933 BasicCegarLoop]: 141 mSDtfsCounter, 186 mSDsluCounter, 305 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 446 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:04,713 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 446 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:38:04,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2832 states. [2021-11-23 17:38:04,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2832 to 1655. [2021-11-23 17:38:04,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1655 states, 1654 states have (on average 1.4353083434099154) internal successors, (2374), 1654 states have internal predecessors, (2374), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:04,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1655 states to 1655 states and 2374 transitions. [2021-11-23 17:38:04,881 INFO L78 Accepts]: Start accepts. Automaton has 1655 states and 2374 transitions. Word has length 54 [2021-11-23 17:38:04,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:04,881 INFO L470 AbstractCegarLoop]: Abstraction has 1655 states and 2374 transitions. [2021-11-23 17:38:04,882 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:04,882 INFO L276 IsEmpty]: Start isEmpty. Operand 1655 states and 2374 transitions. [2021-11-23 17:38:04,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 17:38:04,883 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:04,883 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:04,898 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:05,098 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:05,100 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:05,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:05,100 INFO L85 PathProgramCache]: Analyzing trace with hash 1044582089, now seen corresponding path program 1 times [2021-11-23 17:38:05,100 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:05,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [727219468] [2021-11-23 17:38:05,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:05,101 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:05,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:05,102 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:05,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:38:05,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:05,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:38:05,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:05,318 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 17:38:05,318 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:05,318 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:05,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [727219468] [2021-11-23 17:38:05,319 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [727219468] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:05,319 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:05,319 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:38:05,319 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211148675] [2021-11-23 17:38:05,319 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:05,320 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:38:05,320 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:05,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:38:05,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:38:05,321 INFO L87 Difference]: Start difference. First operand 1655 states and 2374 transitions. Second operand has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:05,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:05,483 INFO L93 Difference]: Finished difference Result 3294 states and 4780 transitions. [2021-11-23 17:38:05,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:38:05,483 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-23 17:38:05,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:05,498 INFO L225 Difference]: With dead ends: 3294 [2021-11-23 17:38:05,498 INFO L226 Difference]: Without dead ends: 2379 [2021-11-23 17:38:05,500 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 53 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 17:38:05,501 INFO L933 BasicCegarLoop]: 152 mSDtfsCounter, 59 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 222 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 17:38:05,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 222 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:38:05,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2379 states. [2021-11-23 17:38:05,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2379 to 2377. [2021-11-23 17:38:05,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2377 states, 2376 states have (on average 1.4292929292929293) internal successors, (3396), 2376 states have internal predecessors, (3396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:05,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2377 states to 2377 states and 3396 transitions. [2021-11-23 17:38:05,703 INFO L78 Accepts]: Start accepts. Automaton has 2377 states and 3396 transitions. Word has length 55 [2021-11-23 17:38:05,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:05,703 INFO L470 AbstractCegarLoop]: Abstraction has 2377 states and 3396 transitions. [2021-11-23 17:38:05,703 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:05,704 INFO L276 IsEmpty]: Start isEmpty. Operand 2377 states and 3396 transitions. [2021-11-23 17:38:05,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 17:38:05,706 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:05,707 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] [2021-11-23 17:38:05,722 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:05,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:05,920 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:05,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:05,921 INFO L85 PathProgramCache]: Analyzing trace with hash -1276698888, now seen corresponding path program 1 times [2021-11-23 17:38:05,922 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:05,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [698095076] [2021-11-23 17:38:05,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:05,922 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:05,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:05,924 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:05,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:38:06,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:06,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:38:06,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:06,201 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:06,202 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:06,202 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:06,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [698095076] [2021-11-23 17:38:06,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [698095076] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:06,203 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:06,203 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:38:06,203 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899211345] [2021-11-23 17:38:06,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:06,204 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:38:06,204 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:06,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:38:06,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:38:06,206 INFO L87 Difference]: Start difference. First operand 2377 states and 3396 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:06,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:06,370 INFO L93 Difference]: Finished difference Result 4039 states and 5805 transitions. [2021-11-23 17:38:06,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:38:06,371 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-23 17:38:06,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:06,383 INFO L225 Difference]: With dead ends: 4039 [2021-11-23 17:38:06,383 INFO L226 Difference]: Without dead ends: 1693 [2021-11-23 17:38:06,389 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 76 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 17:38:06,391 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 45 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 218 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 17:38:06,392 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 218 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:38:06,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1693 states. [2021-11-23 17:38:06,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1693 to 1691. [2021-11-23 17:38:06,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1691 states, 1690 states have (on average 1.4284023668639054) internal successors, (2414), 1690 states have internal predecessors, (2414), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:06,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1691 states to 1691 states and 2414 transitions. [2021-11-23 17:38:06,557 INFO L78 Accepts]: Start accepts. Automaton has 1691 states and 2414 transitions. Word has length 78 [2021-11-23 17:38:06,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:06,558 INFO L470 AbstractCegarLoop]: Abstraction has 1691 states and 2414 transitions. [2021-11-23 17:38:06,558 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:06,558 INFO L276 IsEmpty]: Start isEmpty. Operand 1691 states and 2414 transitions. [2021-11-23 17:38:06,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:38:06,565 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:06,565 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:06,579 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:06,779 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:06,780 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:06,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:06,781 INFO L85 PathProgramCache]: Analyzing trace with hash -360968035, now seen corresponding path program 1 times [2021-11-23 17:38:06,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:06,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1279808299] [2021-11-23 17:38:06,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:06,782 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:06,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:06,783 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:06,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 17:38:06,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:06,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:06,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:08,112 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:08,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:08,899 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:08,899 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:08,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1279808299] [2021-11-23 17:38:08,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1279808299] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:08,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [807443984] [2021-11-23 17:38:08,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:08,901 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:08,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:08,903 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:08,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-23 17:38:09,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:09,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:09,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:09,951 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:09,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:10,565 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:10,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [807443984] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:10,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1150154630] [2021-11-23 17:38:10,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:10,566 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:10,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:10,570 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:10,594 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 17:38:10,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:10,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:10,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:11,472 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:11,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:12,040 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:12,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1150154630] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:12,040 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:12,041 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:38:12,041 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265536736] [2021-11-23 17:38:12,041 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:12,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:38:12,043 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:12,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:38:12,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:38:12,045 INFO L87 Difference]: Start difference. First operand 1691 states and 2414 transitions. Second operand has 16 states, 16 states have (on average 8.6875) internal successors, (139), 15 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:12,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:12,341 INFO L93 Difference]: Finished difference Result 3352 states and 4798 transitions. [2021-11-23 17:38:12,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:38:12,342 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.6875) internal successors, (139), 15 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-23 17:38:12,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:12,352 INFO L225 Difference]: With dead ends: 3352 [2021-11-23 17:38:12,353 INFO L226 Difference]: Without dead ends: 1718 [2021-11-23 17:38:12,356 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 461 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=82, Invalid=298, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:38:12,356 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 72 mSDsluCounter, 661 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 743 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 90 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:12,357 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 743 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 45 Invalid, 0 Unknown, 90 Unchecked, 0.1s Time] [2021-11-23 17:38:12,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1718 states. [2021-11-23 17:38:12,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1718 to 1718. [2021-11-23 17:38:12,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1718 states, 1717 states have (on average 1.423412929528247) internal successors, (2444), 1717 states have internal predecessors, (2444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:12,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1718 states to 1718 states and 2444 transitions. [2021-11-23 17:38:12,475 INFO L78 Accepts]: Start accepts. Automaton has 1718 states and 2444 transitions. Word has length 80 [2021-11-23 17:38:12,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:12,475 INFO L470 AbstractCegarLoop]: Abstraction has 1718 states and 2444 transitions. [2021-11-23 17:38:12,475 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.6875) internal successors, (139), 15 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:12,476 INFO L276 IsEmpty]: Start isEmpty. Operand 1718 states and 2444 transitions. [2021-11-23 17:38:12,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:38:12,478 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:12,480 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] [2021-11-23 17:38:12,489 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:12,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:12,916 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-11-23 17:38:13,092 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:13,093 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:13,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:13,093 INFO L85 PathProgramCache]: Analyzing trace with hash -1015584653, now seen corresponding path program 1 times [2021-11-23 17:38:13,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:13,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1178650377] [2021-11-23 17:38:13,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:13,094 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:13,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:13,096 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:13,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 17:38:13,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:13,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:13,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:14,532 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 17:38:14,533 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:14,971 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 17:38:14,972 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:14,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1178650377] [2021-11-23 17:38:14,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1178650377] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:14,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1199855239] [2021-11-23 17:38:14,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:14,973 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:14,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:14,979 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:15,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 17:38:15,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:15,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:38:15,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:15,309 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:15,309 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:15,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1199855239] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:15,310 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:38:15,310 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:38:15,310 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065845725] [2021-11-23 17:38:15,310 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:15,311 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:38:15,311 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:15,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:38:15,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:38:15,312 INFO L87 Difference]: Start difference. First operand 1718 states and 2444 transitions. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:15,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:15,383 INFO L93 Difference]: Finished difference Result 2538 states and 3622 transitions. [2021-11-23 17:38:15,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:38:15,384 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-23 17:38:15,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:15,391 INFO L225 Difference]: With dead ends: 2538 [2021-11-23 17:38:15,391 INFO L226 Difference]: Without dead ends: 904 [2021-11-23 17:38:15,394 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:38:15,395 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 37 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 197 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 17:38:15,395 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 197 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:38:15,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 904 states. [2021-11-23 17:38:15,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 904 to 902. [2021-11-23 17:38:15,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 902 states, 901 states have (on average 1.3940066592674807) internal successors, (1256), 901 states have internal predecessors, (1256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:15,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 902 states to 902 states and 1256 transitions. [2021-11-23 17:38:15,466 INFO L78 Accepts]: Start accepts. Automaton has 902 states and 1256 transitions. Word has length 80 [2021-11-23 17:38:15,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:15,467 INFO L470 AbstractCegarLoop]: Abstraction has 902 states and 1256 transitions. [2021-11-23 17:38:15,467 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:15,467 INFO L276 IsEmpty]: Start isEmpty. Operand 902 states and 1256 transitions. [2021-11-23 17:38:15,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:38:15,469 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:15,469 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:15,471 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:15,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:15,871 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:15,871 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:15,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:15,872 INFO L85 PathProgramCache]: Analyzing trace with hash 2061397245, now seen corresponding path program 1 times [2021-11-23 17:38:15,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:15,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1260428273] [2021-11-23 17:38:15,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:15,873 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:15,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:15,875 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:15,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 17:38:15,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:15,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:15,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:17,404 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:17,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:17,835 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:17,835 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:17,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1260428273] [2021-11-23 17:38:17,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1260428273] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:17,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [475793417] [2021-11-23 17:38:17,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:17,836 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:17,837 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:17,838 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:17,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-11-23 17:38:18,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:18,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:18,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:19,264 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:19,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:19,572 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:19,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [475793417] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:19,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1922672515] [2021-11-23 17:38:19,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:19,573 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:19,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:19,578 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:19,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 17:38:19,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:19,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:19,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:20,844 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:20,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:21,128 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:21,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1922672515] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:21,128 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:21,128 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:38:21,129 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141602393] [2021-11-23 17:38:21,129 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:21,130 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:38:21,130 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:21,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:38:21,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:38:21,132 INFO L87 Difference]: Start difference. First operand 902 states and 1256 transitions. Second operand has 16 states, 16 states have (on average 9.0625) internal successors, (145), 15 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:21,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:21,358 INFO L93 Difference]: Finished difference Result 1756 states and 2465 transitions. [2021-11-23 17:38:21,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:38:21,359 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.0625) internal successors, (145), 15 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-23 17:38:21,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:21,366 INFO L225 Difference]: With dead ends: 1756 [2021-11-23 17:38:21,366 INFO L226 Difference]: Without dead ends: 938 [2021-11-23 17:38:21,369 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 460 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:38:21,370 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 148 mSDsluCounter, 495 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 576 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 70 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:21,371 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 576 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 45 Invalid, 0 Unknown, 70 Unchecked, 0.1s Time] [2021-11-23 17:38:21,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 938 states. [2021-11-23 17:38:21,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 938 to 912. [2021-11-23 17:38:21,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 912 states, 911 states have (on average 1.394072447859495) internal successors, (1270), 911 states have internal predecessors, (1270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:21,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 912 states to 912 states and 1270 transitions. [2021-11-23 17:38:21,438 INFO L78 Accepts]: Start accepts. Automaton has 912 states and 1270 transitions. Word has length 80 [2021-11-23 17:38:21,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:21,439 INFO L470 AbstractCegarLoop]: Abstraction has 912 states and 1270 transitions. [2021-11-23 17:38:21,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.0625) internal successors, (145), 15 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:21,440 INFO L276 IsEmpty]: Start isEmpty. Operand 912 states and 1270 transitions. [2021-11-23 17:38:21,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:38:21,442 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:21,442 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] [2021-11-23 17:38:21,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:21,708 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:21,892 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:22,086 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:22,086 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:22,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:22,087 INFO L85 PathProgramCache]: Analyzing trace with hash 467112563, now seen corresponding path program 1 times [2021-11-23 17:38:22,087 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:22,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [134269686] [2021-11-23 17:38:22,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:22,088 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:22,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:22,088 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:22,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 17:38:22,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:22,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:38:22,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:22,341 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:22,341 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:22,341 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:22,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [134269686] [2021-11-23 17:38:22,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [134269686] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:22,342 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:22,342 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:38:22,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083144462] [2021-11-23 17:38:22,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:22,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:38:22,344 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:22,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:38:22,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:38:22,345 INFO L87 Difference]: Start difference. First operand 912 states and 1270 transitions. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:22,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:22,395 INFO L93 Difference]: Finished difference Result 1324 states and 1854 transitions. [2021-11-23 17:38:22,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:38:22,396 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-23 17:38:22,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:22,400 INFO L225 Difference]: With dead ends: 1324 [2021-11-23 17:38:22,400 INFO L226 Difference]: Without dead ends: 506 [2021-11-23 17:38:22,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:38:22,403 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 29 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 191 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 17:38:22,403 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 191 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:38:22,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2021-11-23 17:38:22,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 504. [2021-11-23 17:38:22,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 1.3518886679920477) internal successors, (680), 503 states have internal predecessors, (680), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:22,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 680 transitions. [2021-11-23 17:38:22,441 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 680 transitions. Word has length 80 [2021-11-23 17:38:22,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:22,441 INFO L470 AbstractCegarLoop]: Abstraction has 504 states and 680 transitions. [2021-11-23 17:38:22,442 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:22,442 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 680 transitions. [2021-11-23 17:38:22,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:38:22,444 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:22,444 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:22,460 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:22,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:22,660 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:22,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:22,661 INFO L85 PathProgramCache]: Analyzing trace with hash 298563487, now seen corresponding path program 1 times [2021-11-23 17:38:22,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:22,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [131616571] [2021-11-23 17:38:22,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:22,662 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:22,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:22,663 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:22,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 17:38:22,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:22,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:38:22,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:23,150 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:38:23,150 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:23,150 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:23,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [131616571] [2021-11-23 17:38:23,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [131616571] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:23,151 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:23,151 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:38:23,151 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117150867] [2021-11-23 17:38:23,152 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:23,152 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:38:23,152 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:23,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:38:23,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:23,153 INFO L87 Difference]: Start difference. First operand 504 states and 680 transitions. Second operand has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 5 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:23,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:23,235 INFO L93 Difference]: Finished difference Result 927 states and 1270 transitions. [2021-11-23 17:38:23,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:38:23,236 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 5 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-23 17:38:23,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:23,239 INFO L225 Difference]: With dead ends: 927 [2021-11-23 17:38:23,240 INFO L226 Difference]: Without dead ends: 504 [2021-11-23 17:38:23,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 75 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 17:38:23,242 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 30 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:23,242 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 182 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 18 Unchecked, 0.0s Time] [2021-11-23 17:38:23,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2021-11-23 17:38:23,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 504. [2021-11-23 17:38:23,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 1.3499005964214712) internal successors, (679), 503 states have internal predecessors, (679), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:23,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 679 transitions. [2021-11-23 17:38:23,281 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 679 transitions. Word has length 80 [2021-11-23 17:38:23,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:23,281 INFO L470 AbstractCegarLoop]: Abstraction has 504 states and 679 transitions. [2021-11-23 17:38:23,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 5 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:23,282 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 679 transitions. [2021-11-23 17:38:23,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:38:23,283 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:23,283 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:23,302 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:23,501 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:23,502 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:23,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:23,503 INFO L85 PathProgramCache]: Analyzing trace with hash 62678687, now seen corresponding path program 1 times [2021-11-23 17:38:23,503 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:23,504 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [336626745] [2021-11-23 17:38:23,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:23,504 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:23,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:23,505 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:23,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:38:23,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:23,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:38:23,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:24,030 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:38:24,030 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:24,030 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:24,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [336626745] [2021-11-23 17:38:24,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [336626745] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:24,031 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:24,031 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:38:24,031 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846732314] [2021-11-23 17:38:24,032 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:24,032 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:38:24,032 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:24,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:38:24,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:24,033 INFO L87 Difference]: Start difference. First operand 504 states and 679 transitions. Second operand has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 5 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:24,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:24,102 INFO L93 Difference]: Finished difference Result 931 states and 1274 transitions. [2021-11-23 17:38:24,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:38:24,103 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 5 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-23 17:38:24,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:24,107 INFO L225 Difference]: With dead ends: 931 [2021-11-23 17:38:24,107 INFO L226 Difference]: Without dead ends: 504 [2021-11-23 17:38:24,108 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 75 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 17:38:24,109 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 28 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:24,110 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 226 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 33 Unchecked, 0.0s Time] [2021-11-23 17:38:24,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2021-11-23 17:38:24,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 504. [2021-11-23 17:38:24,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 1.3479125248508945) internal successors, (678), 503 states have internal predecessors, (678), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:24,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 678 transitions. [2021-11-23 17:38:24,147 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 678 transitions. Word has length 80 [2021-11-23 17:38:24,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:24,147 INFO L470 AbstractCegarLoop]: Abstraction has 504 states and 678 transitions. [2021-11-23 17:38:24,147 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 5 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:24,148 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 678 transitions. [2021-11-23 17:38:24,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:38:24,149 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:24,149 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:24,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:24,362 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:24,362 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:24,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:24,363 INFO L85 PathProgramCache]: Analyzing trace with hash 532518303, now seen corresponding path program 1 times [2021-11-23 17:38:24,364 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:24,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1179234805] [2021-11-23 17:38:24,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:24,364 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:24,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:24,366 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:24,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 17:38:24,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:24,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:38:24,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:24,847 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:38:24,848 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:24,848 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:24,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1179234805] [2021-11-23 17:38:24,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1179234805] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:24,849 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:24,849 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:38:24,849 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728283245] [2021-11-23 17:38:24,849 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:24,851 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:38:24,852 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:24,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:38:24,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:24,853 INFO L87 Difference]: Start difference. First operand 504 states and 678 transitions. Second operand has 6 states, 6 states have (on average 12.5) internal successors, (75), 5 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:24,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:24,936 INFO L93 Difference]: Finished difference Result 935 states and 1278 transitions. [2021-11-23 17:38:24,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:38:24,937 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 5 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-23 17:38:24,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:24,940 INFO L225 Difference]: With dead ends: 935 [2021-11-23 17:38:24,940 INFO L226 Difference]: Without dead ends: 504 [2021-11-23 17:38:24,941 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 75 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 17:38:24,942 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 33 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:24,943 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 224 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 33 Unchecked, 0.0s Time] [2021-11-23 17:38:24,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2021-11-23 17:38:24,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 504. [2021-11-23 17:38:24,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 1.345924453280318) internal successors, (677), 503 states have internal predecessors, (677), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:24,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 677 transitions. [2021-11-23 17:38:24,989 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 677 transitions. Word has length 80 [2021-11-23 17:38:24,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:24,990 INFO L470 AbstractCegarLoop]: Abstraction has 504 states and 677 transitions. [2021-11-23 17:38:24,990 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 5 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:24,990 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 677 transitions. [2021-11-23 17:38:24,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:38:24,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:24,992 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:25,009 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:25,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:25,209 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:25,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:25,210 INFO L85 PathProgramCache]: Analyzing trace with hash -376486753, now seen corresponding path program 1 times [2021-11-23 17:38:25,210 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:25,210 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [713688338] [2021-11-23 17:38:25,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:25,210 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:25,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:25,212 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:25,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:38:25,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:25,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:38:25,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:25,719 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:38:25,719 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:25,720 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:25,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [713688338] [2021-11-23 17:38:25,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [713688338] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:25,720 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:25,720 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:38:25,721 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803910997] [2021-11-23 17:38:25,721 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:25,721 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:38:25,722 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:25,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:38:25,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:25,723 INFO L87 Difference]: Start difference. First operand 504 states and 677 transitions. Second operand has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:25,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:25,834 INFO L93 Difference]: Finished difference Result 914 states and 1254 transitions. [2021-11-23 17:38:25,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:38:25,835 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-23 17:38:25,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:25,838 INFO L225 Difference]: With dead ends: 914 [2021-11-23 17:38:25,839 INFO L226 Difference]: Without dead ends: 479 [2021-11-23 17:38:25,840 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 75 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 17:38:25,841 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 26 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:25,841 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 217 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 52 Invalid, 0 Unknown, 9 Unchecked, 0.1s Time] [2021-11-23 17:38:25,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2021-11-23 17:38:25,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 479. [2021-11-23 17:38:25,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 478 states have (on average 1.3556485355648535) internal successors, (648), 478 states have internal predecessors, (648), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:25,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 648 transitions. [2021-11-23 17:38:25,874 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 648 transitions. Word has length 80 [2021-11-23 17:38:25,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:25,874 INFO L470 AbstractCegarLoop]: Abstraction has 479 states and 648 transitions. [2021-11-23 17:38:25,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:25,875 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 648 transitions. [2021-11-23 17:38:25,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:38:25,876 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:25,876 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:25,894 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:26,090 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:26,090 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:26,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:26,091 INFO L85 PathProgramCache]: Analyzing trace with hash -877337902, now seen corresponding path program 1 times [2021-11-23 17:38:26,091 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:26,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1335021311] [2021-11-23 17:38:26,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:26,091 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:26,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:26,093 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:26,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 17:38:26,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:26,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:26,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:27,416 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:27,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:27,864 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:27,864 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:27,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1335021311] [2021-11-23 17:38:27,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1335021311] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:27,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [59567403] [2021-11-23 17:38:27,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:27,865 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:27,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:27,866 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:27,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-23 17:38:28,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:28,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:28,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:29,156 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:29,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:29,487 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:29,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [59567403] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:29,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [3927114] [2021-11-23 17:38:29,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:29,488 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:29,488 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:29,488 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:29,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-23 17:38:29,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:29,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:29,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:30,662 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:30,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:31,033 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:31,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [3927114] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:31,034 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:31,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:38:31,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557365609] [2021-11-23 17:38:31,035 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:31,035 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:38:31,036 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:31,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:38:31,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:38:31,037 INFO L87 Difference]: Start difference. First operand 479 states and 648 transitions. Second operand has 16 states, 16 states have (on average 9.4375) internal successors, (151), 15 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:31,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:31,199 INFO L93 Difference]: Finished difference Result 903 states and 1249 transitions. [2021-11-23 17:38:31,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 17:38:31,200 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.4375) internal successors, (151), 15 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-23 17:38:31,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:31,203 INFO L225 Difference]: With dead ends: 903 [2021-11-23 17:38:31,204 INFO L226 Difference]: Without dead ends: 493 [2021-11-23 17:38:31,205 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 467 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:38:31,206 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 133 mSDsluCounter, 589 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 671 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:31,206 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 671 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 81 Unchecked, 0.0s Time] [2021-11-23 17:38:31,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 493 states. [2021-11-23 17:38:31,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 493 to 491. [2021-11-23 17:38:31,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 490 states have (on average 1.3591836734693878) internal successors, (666), 490 states have internal predecessors, (666), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:31,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 666 transitions. [2021-11-23 17:38:31,241 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 666 transitions. Word has length 81 [2021-11-23 17:38:31,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:31,242 INFO L470 AbstractCegarLoop]: Abstraction has 491 states and 666 transitions. [2021-11-23 17:38:31,242 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.4375) internal successors, (151), 15 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:31,242 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 666 transitions. [2021-11-23 17:38:31,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:38:31,244 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:31,244 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:31,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:31,458 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Ended with exit code 0 [2021-11-23 17:38:31,682 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-11-23 17:38:31,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:31,858 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:31,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:31,858 INFO L85 PathProgramCache]: Analyzing trace with hash -539544760, now seen corresponding path program 1 times [2021-11-23 17:38:31,859 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:31,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [200774269] [2021-11-23 17:38:31,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:31,859 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:31,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:31,860 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:31,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:38:31,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:31,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:38:31,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:32,068 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:32,068 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:32,068 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:32,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [200774269] [2021-11-23 17:38:32,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [200774269] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:32,069 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:32,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:38:32,071 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372171397] [2021-11-23 17:38:32,071 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:32,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:38:32,072 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:32,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:38:32,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:38:32,073 INFO L87 Difference]: Start difference. First operand 491 states and 666 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:32,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:32,093 INFO L93 Difference]: Finished difference Result 699 states and 956 transitions. [2021-11-23 17:38:32,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:38:32,093 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-23 17:38:32,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:32,095 INFO L225 Difference]: With dead ends: 699 [2021-11-23 17:38:32,096 INFO L226 Difference]: Without dead ends: 289 [2021-11-23 17:38:32,097 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:38:32,100 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 24 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 176 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 17:38:32,101 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 176 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:38:32,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-23 17:38:32,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 287. [2021-11-23 17:38:32,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 287 states, 286 states have (on average 1.3041958041958042) internal successors, (373), 286 states have internal predecessors, (373), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:32,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 373 transitions. [2021-11-23 17:38:32,133 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 373 transitions. Word has length 81 [2021-11-23 17:38:32,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:32,134 INFO L470 AbstractCegarLoop]: Abstraction has 287 states and 373 transitions. [2021-11-23 17:38:32,134 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:32,134 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 373 transitions. [2021-11-23 17:38:32,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 17:38:32,135 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:32,135 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:32,147 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:32,338 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:32,338 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:32,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:32,339 INFO L85 PathProgramCache]: Analyzing trace with hash -1684092460, now seen corresponding path program 1 times [2021-11-23 17:38:32,339 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:32,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [139774151] [2021-11-23 17:38:32,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:32,340 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:32,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:32,342 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:32,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 17:38:32,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:32,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:32,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:33,644 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:33,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:34,154 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:34,154 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:34,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [139774151] [2021-11-23 17:38:34,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [139774151] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:34,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [369146694] [2021-11-23 17:38:34,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:34,154 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:34,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:34,158 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:34,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-23 17:38:34,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:34,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:34,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:35,191 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:35,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:35,535 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:35,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [369146694] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:35,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1427986589] [2021-11-23 17:38:35,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:35,536 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:35,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:35,537 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:35,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-23 17:38:35,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:35,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:38:35,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:36,621 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:36,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:36,960 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:36,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1427986589] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:36,961 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:36,961 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:38:36,961 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855919978] [2021-11-23 17:38:36,961 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:36,962 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:38:36,962 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:36,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:38:36,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:38:36,963 INFO L87 Difference]: Start difference. First operand 287 states and 373 transitions. Second operand has 16 states, 16 states have (on average 9.8125) internal successors, (157), 15 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 17:38:37,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:37,093 INFO L93 Difference]: Finished difference Result 505 states and 677 transitions. [2021-11-23 17:38:37,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:38:37,094 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.8125) internal successors, (157), 15 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) Word has length 82 [2021-11-23 17:38:37,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:37,096 INFO L225 Difference]: With dead ends: 505 [2021-11-23 17:38:37,096 INFO L226 Difference]: Without dead ends: 299 [2021-11-23 17:38:37,097 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 473 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=80, Invalid=300, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:38:37,099 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 115 mSDsluCounter, 810 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 891 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:37,100 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [115 Valid, 891 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 20 Invalid, 0 Unknown, 92 Unchecked, 0.0s Time] [2021-11-23 17:38:37,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-11-23 17:38:37,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 299. [2021-11-23 17:38:37,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 298 states have (on average 1.3053691275167785) internal successors, (389), 298 states have internal predecessors, (389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:37,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 389 transitions. [2021-11-23 17:38:37,121 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 389 transitions. Word has length 82 [2021-11-23 17:38:37,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:37,121 INFO L470 AbstractCegarLoop]: Abstraction has 299 states and 389 transitions. [2021-11-23 17:38:37,122 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.8125) internal successors, (157), 15 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 17:38:37,122 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 389 transitions. [2021-11-23 17:38:37,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:38:37,123 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:37,123 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:37,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:37,351 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Ended with exit code 0 [2021-11-23 17:38:37,546 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:37,744 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:37,745 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:37,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:37,745 INFO L85 PathProgramCache]: Analyzing trace with hash -947709751, now seen corresponding path program 1 times [2021-11-23 17:38:37,745 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:37,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [234886879] [2021-11-23 17:38:37,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:37,745 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:37,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:37,746 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:37,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 17:38:37,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:37,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:38:37,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:38,495 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:38:38,495 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:38,496 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:38,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [234886879] [2021-11-23 17:38:38,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [234886879] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:38,496 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:38,496 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:38:38,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230816849] [2021-11-23 17:38:38,497 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:38,497 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:38:38,497 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:38,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:38:38,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:38,498 INFO L87 Difference]: Start difference. First operand 299 states and 389 transitions. Second operand has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:38,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:38,623 INFO L93 Difference]: Finished difference Result 663 states and 889 transitions. [2021-11-23 17:38:38,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:38:38,626 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-23 17:38:38,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:38,631 INFO L225 Difference]: With dead ends: 663 [2021-11-23 17:38:38,631 INFO L226 Difference]: Without dead ends: 593 [2021-11-23 17:38:38,632 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:38,633 INFO L933 BasicCegarLoop]: 170 mSDtfsCounter, 439 mSDsluCounter, 278 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 439 SdHoareTripleChecker+Valid, 448 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:38,633 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [439 Valid, 448 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:38:38,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 593 states. [2021-11-23 17:38:38,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 593 to 445. [2021-11-23 17:38:38,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 444 states have (on average 1.313063063063063) internal successors, (583), 444 states have internal predecessors, (583), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:38,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 583 transitions. [2021-11-23 17:38:38,668 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 583 transitions. Word has length 83 [2021-11-23 17:38:38,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:38,669 INFO L470 AbstractCegarLoop]: Abstraction has 445 states and 583 transitions. [2021-11-23 17:38:38,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:38,669 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 583 transitions. [2021-11-23 17:38:38,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:38:38,670 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:38,671 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:38,686 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:38,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:38,884 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:38,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:38,885 INFO L85 PathProgramCache]: Analyzing trace with hash -734252954, now seen corresponding path program 1 times [2021-11-23 17:38:38,885 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:38,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [27336524] [2021-11-23 17:38:38,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:38,886 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:38,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:38,887 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:38,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-23 17:38:38,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:38,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:38:38,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:39,578 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:38:39,578 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:39,578 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:39,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [27336524] [2021-11-23 17:38:39,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [27336524] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:39,579 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:39,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:38:39,579 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218641465] [2021-11-23 17:38:39,579 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:39,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:38:39,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:39,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:38:39,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:39,580 INFO L87 Difference]: Start difference. First operand 445 states and 583 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:39,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:39,721 INFO L93 Difference]: Finished difference Result 741 states and 992 transitions. [2021-11-23 17:38:39,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:38:39,722 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-23 17:38:39,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:39,726 INFO L225 Difference]: With dead ends: 741 [2021-11-23 17:38:39,726 INFO L226 Difference]: Without dead ends: 535 [2021-11-23 17:38:39,727 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:39,728 INFO L933 BasicCegarLoop]: 174 mSDtfsCounter, 442 mSDsluCounter, 296 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 442 SdHoareTripleChecker+Valid, 470 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:39,728 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [442 Valid, 470 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:38:39,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2021-11-23 17:38:39,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 377. [2021-11-23 17:38:39,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 376 states have (on average 1.2925531914893618) internal successors, (486), 376 states have internal predecessors, (486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:39,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 486 transitions. [2021-11-23 17:38:39,759 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 486 transitions. Word has length 83 [2021-11-23 17:38:39,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:39,760 INFO L470 AbstractCegarLoop]: Abstraction has 377 states and 486 transitions. [2021-11-23 17:38:39,760 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:39,760 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 486 transitions. [2021-11-23 17:38:39,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:38:39,761 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:39,762 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:39,781 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:39,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:39,975 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:39,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:39,975 INFO L85 PathProgramCache]: Analyzing trace with hash 768106153, now seen corresponding path program 1 times [2021-11-23 17:38:39,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:39,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [969473505] [2021-11-23 17:38:39,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:39,976 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:39,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:39,977 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:39,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 17:38:40,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:40,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:38:40,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:40,692 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:38:40,692 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:40,692 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:40,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [969473505] [2021-11-23 17:38:40,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [969473505] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:40,692 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:40,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:38:40,694 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026221969] [2021-11-23 17:38:40,694 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:40,695 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:38:40,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:40,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:38:40,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:40,696 INFO L87 Difference]: Start difference. First operand 377 states and 486 transitions. Second operand has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:40,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:40,829 INFO L93 Difference]: Finished difference Result 673 states and 895 transitions. [2021-11-23 17:38:40,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:38:40,830 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-23 17:38:40,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:40,834 INFO L225 Difference]: With dead ends: 673 [2021-11-23 17:38:40,835 INFO L226 Difference]: Without dead ends: 603 [2021-11-23 17:38:40,835 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:40,836 INFO L933 BasicCegarLoop]: 181 mSDtfsCounter, 290 mSDsluCounter, 399 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 580 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:40,837 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [290 Valid, 580 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:38:40,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 603 states. [2021-11-23 17:38:40,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 603 to 449. [2021-11-23 17:38:40,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 448 states have (on average 1.296875) internal successors, (581), 448 states have internal predecessors, (581), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:40,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 581 transitions. [2021-11-23 17:38:40,873 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 581 transitions. Word has length 83 [2021-11-23 17:38:40,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:40,874 INFO L470 AbstractCegarLoop]: Abstraction has 449 states and 581 transitions. [2021-11-23 17:38:40,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:40,875 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 581 transitions. [2021-11-23 17:38:40,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:38:40,875 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:40,876 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:40,884 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Ended with exit code 0 [2021-11-23 17:38:41,076 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:41,076 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:41,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:41,077 INFO L85 PathProgramCache]: Analyzing trace with hash -587357626, now seen corresponding path program 1 times [2021-11-23 17:38:41,077 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:41,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [762693558] [2021-11-23 17:38:41,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:41,077 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:41,078 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:41,079 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:41,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 17:38:41,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:41,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:38:41,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:41,832 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:38:41,832 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:38:41,832 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:41,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [762693558] [2021-11-23 17:38:41,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [762693558] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:38:41,832 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:38:41,832 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:38:41,833 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114422528] [2021-11-23 17:38:41,833 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:38:41,833 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:38:41,833 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:41,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:38:41,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:41,834 INFO L87 Difference]: Start difference. First operand 449 states and 581 transitions. Second operand has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:41,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:41,978 INFO L93 Difference]: Finished difference Result 745 states and 990 transitions. [2021-11-23 17:38:41,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:38:41,978 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-23 17:38:41,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:41,986 INFO L225 Difference]: With dead ends: 745 [2021-11-23 17:38:41,986 INFO L226 Difference]: Without dead ends: 675 [2021-11-23 17:38:41,987 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:38:41,987 INFO L933 BasicCegarLoop]: 189 mSDtfsCounter, 304 mSDsluCounter, 354 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 304 SdHoareTripleChecker+Valid, 543 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:41,989 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [304 Valid, 543 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:38:41,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 675 states. [2021-11-23 17:38:42,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 675 to 527. [2021-11-23 17:38:42,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 527 states, 526 states have (on average 1.3003802281368821) internal successors, (684), 526 states have internal predecessors, (684), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:42,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 527 states to 527 states and 684 transitions. [2021-11-23 17:38:42,037 INFO L78 Accepts]: Start accepts. Automaton has 527 states and 684 transitions. Word has length 83 [2021-11-23 17:38:42,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:42,037 INFO L470 AbstractCegarLoop]: Abstraction has 527 states and 684 transitions. [2021-11-23 17:38:42,038 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:42,038 INFO L276 IsEmpty]: Start isEmpty. Operand 527 states and 684 transitions. [2021-11-23 17:38:42,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:38:42,039 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:42,040 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:42,057 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:42,253 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:38:42,253 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:42,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:42,254 INFO L85 PathProgramCache]: Analyzing trace with hash -812578338, now seen corresponding path program 1 times [2021-11-23 17:38:42,254 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:42,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1551492560] [2021-11-23 17:38:42,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:42,255 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:42,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:42,255 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:42,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 17:38:42,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:42,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:38:42,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:44,326 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:44,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:44,990 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:44,990 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:44,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1551492560] [2021-11-23 17:38:44,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1551492560] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:44,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1566648151] [2021-11-23 17:38:44,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:44,990 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:44,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:44,991 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:44,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-23 17:38:45,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:45,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:38:45,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:47,012 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:47,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:47,379 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:47,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1566648151] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:47,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [156684543] [2021-11-23 17:38:47,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:47,379 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:47,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:47,380 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:47,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-23 17:38:47,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:47,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:38:47,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:52,553 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:52,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:55,483 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:55,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [156684543] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:55,484 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:55,484 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 17, 14, 25, 24] total 71 [2021-11-23 17:38:55,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744968193] [2021-11-23 17:38:55,484 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:55,485 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-23 17:38:55,485 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:55,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-23 17:38:55,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=793, Invalid=4177, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 17:38:55,488 INFO L87 Difference]: Start difference. First operand 527 states and 684 transitions. Second operand has 71 states, 71 states have (on average 3.8028169014084505) internal successors, (270), 71 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:57,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:38:57,140 INFO L93 Difference]: Finished difference Result 878 states and 1124 transitions. [2021-11-23 17:38:57,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 17:38:57,141 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.8028169014084505) internal successors, (270), 71 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2021-11-23 17:38:57,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:38:57,146 INFO L225 Difference]: With dead ends: 878 [2021-11-23 17:38:57,147 INFO L226 Difference]: Without dead ends: 714 [2021-11-23 17:38:57,150 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 429 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2071 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=935, Invalid=4615, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 17:38:57,151 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 244 mSDsluCounter, 1852 mSDsCounter, 0 mSdLazyCounter, 743 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 244 SdHoareTripleChecker+Valid, 1957 SdHoareTripleChecker+Invalid, 826 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 743 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 52 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:38:57,151 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [244 Valid, 1957 Invalid, 826 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 743 Invalid, 0 Unknown, 52 Unchecked, 0.9s Time] [2021-11-23 17:38:57,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 714 states. [2021-11-23 17:38:57,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 714 to 505. [2021-11-23 17:38:57,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 505 states, 504 states have (on average 1.2996031746031746) internal successors, (655), 504 states have internal predecessors, (655), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:57,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 505 states to 505 states and 655 transitions. [2021-11-23 17:38:57,207 INFO L78 Accepts]: Start accepts. Automaton has 505 states and 655 transitions. Word has length 84 [2021-11-23 17:38:57,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:38:57,207 INFO L470 AbstractCegarLoop]: Abstraction has 505 states and 655 transitions. [2021-11-23 17:38:57,208 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.8028169014084505) internal successors, (270), 71 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:38:57,208 INFO L276 IsEmpty]: Start isEmpty. Operand 505 states and 655 transitions. [2021-11-23 17:38:57,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:38:57,209 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:38:57,209 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:38:57,230 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:57,450 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:57,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Forceful destruction successful, exit code 0 [2021-11-23 17:38:57,823 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:57,824 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:38:57,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:38:57,824 INFO L85 PathProgramCache]: Analyzing trace with hash 838107134, now seen corresponding path program 1 times [2021-11-23 17:38:57,824 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:38:57,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [776157384] [2021-11-23 17:38:57,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:57,825 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:38:57,825 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:38:57,826 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:38:57,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-23 17:38:57,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:57,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 17:38:57,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:03,193 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:03,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:06,077 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:06,077 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:06,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [776157384] [2021-11-23 17:39:06,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [776157384] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:06,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [592488393] [2021-11-23 17:39:06,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:06,077 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:06,078 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:06,078 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:06,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-23 17:39:06,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:06,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:39:06,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:08,395 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:08,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:08,947 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:08,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [592488393] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:08,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1375385611] [2021-11-23 17:39:08,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:08,948 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:08,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:08,949 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:08,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-23 17:39:09,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:09,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:39:09,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:17,586 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:17,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:19,451 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:19,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1375385611] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:19,451 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:19,452 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 24, 11, 9, 29, 26] total 86 [2021-11-23 17:39:19,452 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282880300] [2021-11-23 17:39:19,452 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:19,453 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-11-23 17:39:19,453 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:19,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-11-23 17:39:19,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=969, Invalid=6341, Unknown=0, NotChecked=0, Total=7310 [2021-11-23 17:39:19,457 INFO L87 Difference]: Start difference. First operand 505 states and 655 transitions. Second operand has 86 states, 86 states have (on average 3.9767441860465116) internal successors, (342), 86 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:19,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:19,923 INFO L93 Difference]: Finished difference Result 658 states and 862 transitions. [2021-11-23 17:39:19,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 17:39:19,924 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 3.9767441860465116) internal successors, (342), 86 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2021-11-23 17:39:19,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:19,927 INFO L225 Difference]: With dead ends: 658 [2021-11-23 17:39:19,927 INFO L226 Difference]: Without dead ends: 516 [2021-11-23 17:39:19,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 414 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3292 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=1010, Invalid=6472, Unknown=0, NotChecked=0, Total=7482 [2021-11-23 17:39:19,932 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 282 mSDsluCounter, 1479 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 282 SdHoareTripleChecker+Valid, 1551 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 183 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:19,932 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [282 Valid, 1551 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 156 Invalid, 0 Unknown, 183 Unchecked, 0.3s Time] [2021-11-23 17:39:19,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 516 states. [2021-11-23 17:39:19,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 516 to 516. [2021-11-23 17:39:19,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 516 states, 515 states have (on average 1.2970873786407766) internal successors, (668), 515 states have internal predecessors, (668), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:19,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 516 states to 516 states and 668 transitions. [2021-11-23 17:39:19,962 INFO L78 Accepts]: Start accepts. Automaton has 516 states and 668 transitions. Word has length 84 [2021-11-23 17:39:19,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:19,963 INFO L470 AbstractCegarLoop]: Abstraction has 516 states and 668 transitions. [2021-11-23 17:39:19,963 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 3.9767441860465116) internal successors, (342), 86 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:19,963 INFO L276 IsEmpty]: Start isEmpty. Operand 516 states and 668 transitions. [2021-11-23 17:39:19,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:39:19,963 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:19,964 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:19,988 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:20,167 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (40)] Ended with exit code 0 [2021-11-23 17:39:20,374 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Ended with exit code 0 [2021-11-23 17:39:20,566 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:39:20,567 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:20,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:20,567 INFO L85 PathProgramCache]: Analyzing trace with hash 1768402945, now seen corresponding path program 1 times [2021-11-23 17:39:20,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:20,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [53533897] [2021-11-23 17:39:20,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:20,568 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:20,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:20,569 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:20,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-23 17:39:20,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:20,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:39:20,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:21,954 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:21,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:22,338 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:22,338 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:22,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [53533897] [2021-11-23 17:39:22,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [53533897] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:22,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [692591682] [2021-11-23 17:39:22,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:22,339 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:22,339 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:22,340 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:22,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-11-23 17:39:22,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:22,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:39:22,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:30,845 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:30,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:35,879 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:35,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [692591682] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:35,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [733646889] [2021-11-23 17:39:35,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:35,880 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:35,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:35,881 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:35,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-23 17:39:35,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:35,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:39:35,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:43,915 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:43,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:44,933 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:44,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [733646889] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:44,934 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:44,934 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 29, 24, 28, 24] total 83 [2021-11-23 17:39:44,934 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865247841] [2021-11-23 17:39:44,934 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:44,935 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-23 17:39:44,935 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:44,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-23 17:39:44,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=681, Invalid=6125, Unknown=0, NotChecked=0, Total=6806 [2021-11-23 17:39:44,938 INFO L87 Difference]: Start difference. First operand 516 states and 668 transitions. Second operand has 83 states, 83 states have (on average 4.168674698795181) internal successors, (346), 83 states have internal predecessors, (346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:49,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:49,789 INFO L93 Difference]: Finished difference Result 863 states and 1107 transitions. [2021-11-23 17:39:49,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:39:49,790 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 4.168674698795181) internal successors, (346), 83 states have internal predecessors, (346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2021-11-23 17:39:49,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:49,794 INFO L225 Difference]: With dead ends: 863 [2021-11-23 17:39:49,794 INFO L226 Difference]: Without dead ends: 711 [2021-11-23 17:39:49,799 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 522 GetRequests, 423 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2986 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=1028, Invalid=8872, Unknown=0, NotChecked=0, Total=9900 [2021-11-23 17:39:49,799 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 248 mSDsluCounter, 2660 mSDsCounter, 0 mSdLazyCounter, 572 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 2762 SdHoareTripleChecker+Invalid, 920 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 572 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 329 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:49,800 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [248 Valid, 2762 Invalid, 920 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 572 Invalid, 0 Unknown, 329 Unchecked, 0.7s Time] [2021-11-23 17:39:49,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 711 states. [2021-11-23 17:39:49,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 711 to 517. [2021-11-23 17:39:49,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 517 states, 516 states have (on average 1.2965116279069768) internal successors, (669), 516 states have internal predecessors, (669), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:49,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 517 states to 517 states and 669 transitions. [2021-11-23 17:39:49,829 INFO L78 Accepts]: Start accepts. Automaton has 517 states and 669 transitions. Word has length 84 [2021-11-23 17:39:49,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:49,830 INFO L470 AbstractCegarLoop]: Abstraction has 517 states and 669 transitions. [2021-11-23 17:39:49,830 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 4.168674698795181) internal successors, (346), 83 states have internal predecessors, (346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:39:49,830 INFO L276 IsEmpty]: Start isEmpty. Operand 517 states and 669 transitions. [2021-11-23 17:39:49,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:39:49,831 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:49,831 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:49,842 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:50,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:50,259 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:50,434 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:50,435 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:50,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:50,436 INFO L85 PathProgramCache]: Analyzing trace with hash -1449431160, now seen corresponding path program 1 times [2021-11-23 17:39:50,436 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:50,436 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [694505473] [2021-11-23 17:39:50,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:50,437 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:50,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:50,438 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:50,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-23 17:39:50,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:50,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:39:50,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:53,113 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:53,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:54,049 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:54,049 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:54,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [694505473] [2021-11-23 17:39:54,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [694505473] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:54,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [41890408] [2021-11-23 17:39:54,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:54,050 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:54,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:54,051 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:54,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-23 17:39:54,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:54,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:39:54,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:01,799 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:01,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:05,495 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:05,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [41890408] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:05,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1611854375] [2021-11-23 17:40:05,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:05,496 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:05,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:40:05,512 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:40:05,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-23 17:40:05,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:05,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 17:40:05,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:09,125 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:09,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:11,405 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:11,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1611854375] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:11,405 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:40:11,405 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 30, 26, 17, 16] total 96 [2021-11-23 17:40:11,406 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500640434] [2021-11-23 17:40:11,406 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:40:11,407 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2021-11-23 17:40:11,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:40:11,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-11-23 17:40:11,410 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1289, Invalid=7831, Unknown=0, NotChecked=0, Total=9120 [2021-11-23 17:40:11,411 INFO L87 Difference]: Start difference. First operand 517 states and 669 transitions. Second operand has 96 states, 96 states have (on average 3.9583333333333335) internal successors, (380), 96 states have internal predecessors, (380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:12,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:40:12,323 INFO L93 Difference]: Finished difference Result 924 states and 1192 transitions. [2021-11-23 17:40:12,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-23 17:40:12,324 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 96 states have (on average 3.9583333333333335) internal successors, (380), 96 states have internal predecessors, (380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 17:40:12,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:40:12,327 INFO L225 Difference]: With dead ends: 924 [2021-11-23 17:40:12,328 INFO L226 Difference]: Without dead ends: 714 [2021-11-23 17:40:12,331 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 410 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3956 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=1341, Invalid=7971, Unknown=0, NotChecked=0, Total=9312 [2021-11-23 17:40:12,332 INFO L933 BasicCegarLoop]: 112 mSDtfsCounter, 262 mSDsluCounter, 2564 mSDsCounter, 0 mSdLazyCounter, 606 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 2676 SdHoareTripleChecker+Invalid, 1185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 606 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 571 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:40:12,332 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [262 Valid, 2676 Invalid, 1185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 606 Invalid, 0 Unknown, 571 Unchecked, 0.7s Time] [2021-11-23 17:40:12,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 714 states. [2021-11-23 17:40:12,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 714 to 529. [2021-11-23 17:40:12,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 529 states, 528 states have (on average 1.293560606060606) internal successors, (683), 528 states have internal predecessors, (683), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:12,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 529 states to 529 states and 683 transitions. [2021-11-23 17:40:12,374 INFO L78 Accepts]: Start accepts. Automaton has 529 states and 683 transitions. Word has length 85 [2021-11-23 17:40:12,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:40:12,374 INFO L470 AbstractCegarLoop]: Abstraction has 529 states and 683 transitions. [2021-11-23 17:40:12,375 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 96 states have (on average 3.9583333333333335) internal successors, (380), 96 states have internal predecessors, (380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:12,375 INFO L276 IsEmpty]: Start isEmpty. Operand 529 states and 683 transitions. [2021-11-23 17:40:12,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:40:12,376 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:40:12,376 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:40:12,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:12,591 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:12,814 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:12,990 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:12,990 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:40:12,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:40:12,991 INFO L85 PathProgramCache]: Analyzing trace with hash -519135349, now seen corresponding path program 1 times [2021-11-23 17:40:12,991 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:40:12,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [202578251] [2021-11-23 17:40:12,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:12,991 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:40:12,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:40:12,992 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:40:12,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 17:40:13,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:13,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:40:13,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:14,358 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:14,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:14,718 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:14,718 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:40:14,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [202578251] [2021-11-23 17:40:14,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [202578251] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:14,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [587134170] [2021-11-23 17:40:14,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:14,719 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:40:14,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:40:14,720 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:40:14,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-11-23 17:40:14,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:14,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:40:14,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:16,484 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:16,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:16,936 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:16,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [587134170] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:16,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2022180277] [2021-11-23 17:40:16,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:16,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:16,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:40:16,938 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:40:16,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 17:40:17,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:17,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:40:17,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:18,675 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:18,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:19,620 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:19,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2022180277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:19,620 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:40:19,621 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 12, 10] total 45 [2021-11-23 17:40:19,621 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085378774] [2021-11-23 17:40:19,621 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:40:19,622 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-23 17:40:19,623 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:40:19,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-23 17:40:19,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1818, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:40:19,624 INFO L87 Difference]: Start difference. First operand 529 states and 683 transitions. Second operand has 45 states, 45 states have (on average 8.911111111111111) internal successors, (401), 45 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:20,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:40:20,505 INFO L93 Difference]: Finished difference Result 831 states and 1074 transitions. [2021-11-23 17:40:20,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:40:20,506 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 8.911111111111111) internal successors, (401), 45 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 17:40:20,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:40:20,509 INFO L225 Difference]: With dead ends: 831 [2021-11-23 17:40:20,509 INFO L226 Difference]: Without dead ends: 679 [2021-11-23 17:40:20,510 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 522 GetRequests, 466 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 728 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=315, Invalid=2877, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 17:40:20,511 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 155 mSDsluCounter, 2171 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 2279 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 173 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:40:20,511 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [155 Valid, 2279 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 117 Invalid, 0 Unknown, 173 Unchecked, 0.1s Time] [2021-11-23 17:40:20,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 679 states. [2021-11-23 17:40:20,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 679 to 514. [2021-11-23 17:40:20,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 514 states, 513 states have (on average 1.2962962962962963) internal successors, (665), 513 states have internal predecessors, (665), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:20,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 665 transitions. [2021-11-23 17:40:20,554 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 665 transitions. Word has length 85 [2021-11-23 17:40:20,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:40:20,555 INFO L470 AbstractCegarLoop]: Abstraction has 514 states and 665 transitions. [2021-11-23 17:40:20,555 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 8.911111111111111) internal successors, (401), 45 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:20,556 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 665 transitions. [2021-11-23 17:40:20,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:40:20,557 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:40:20,557 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] [2021-11-23 17:40:20,568 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:20,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:20,967 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:21,166 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:40:21,167 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:40:21,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:40:21,167 INFO L85 PathProgramCache]: Analyzing trace with hash -1032066507, now seen corresponding path program 1 times [2021-11-23 17:40:21,167 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:40:21,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [735547520] [2021-11-23 17:40:21,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:21,168 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:40:21,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:40:21,169 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:40:21,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 17:40:21,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:21,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:40:21,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:21,488 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:40:21,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:21,691 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:40:21,691 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:40:21,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [735547520] [2021-11-23 17:40:21,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [735547520] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:21,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [522886509] [2021-11-23 17:40:21,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:21,692 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:40:21,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:40:21,698 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:40:21,701 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2021-11-23 17:40:21,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:21,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:40:21,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:22,081 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:40:22,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:22,313 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:40:22,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [522886509] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:22,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1570059128] [2021-11-23 17:40:22,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:22,313 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:22,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:40:22,315 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:40:22,318 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-23 17:40:22,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:22,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:40:22,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:22,644 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:40:22,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:22,978 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:22,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1570059128] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:22,979 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:40:22,979 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 5] total 7 [2021-11-23 17:40:22,979 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401880429] [2021-11-23 17:40:22,979 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:40:22,980 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:40:22,980 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:40:22,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:40:22,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:40:22,981 INFO L87 Difference]: Start difference. First operand 514 states and 665 transitions. Second operand has 7 states, 7 states have (on average 30.0) internal successors, (210), 7 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:23,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:40:23,096 INFO L93 Difference]: Finished difference Result 1689 states and 2213 transitions. [2021-11-23 17:40:23,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 17:40:23,096 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 30.0) internal successors, (210), 7 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 17:40:23,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:40:23,102 INFO L225 Difference]: With dead ends: 1689 [2021-11-23 17:40:23,102 INFO L226 Difference]: Without dead ends: 1279 [2021-11-23 17:40:23,103 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 496 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:40:23,104 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 274 mSDsluCounter, 369 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 274 SdHoareTripleChecker+Valid, 499 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 19 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:40:23,104 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [274 Valid, 499 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 34 Invalid, 0 Unknown, 19 Unchecked, 0.0s Time] [2021-11-23 17:40:23,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1279 states. [2021-11-23 17:40:23,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1279 to 1184. [2021-11-23 17:40:23,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1184 states, 1183 states have (on average 1.2890955198647507) internal successors, (1525), 1183 states have internal predecessors, (1525), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:23,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1184 states to 1184 states and 1525 transitions. [2021-11-23 17:40:23,223 INFO L78 Accepts]: Start accepts. Automaton has 1184 states and 1525 transitions. Word has length 85 [2021-11-23 17:40:23,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:40:23,224 INFO L470 AbstractCegarLoop]: Abstraction has 1184 states and 1525 transitions. [2021-11-23 17:40:23,224 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 30.0) internal successors, (210), 7 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:40:23,224 INFO L276 IsEmpty]: Start isEmpty. Operand 1184 states and 1525 transitions. [2021-11-23 17:40:23,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:40:23,225 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:40:23,226 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:40:23,274 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:23,451 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Ended with exit code 0 [2021-11-23 17:40:23,643 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Ended with exit code 0 [2021-11-23 17:40:23,842 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:40:23,843 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:40:23,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:40:23,843 INFO L85 PathProgramCache]: Analyzing trace with hash 1703310430, now seen corresponding path program 1 times [2021-11-23 17:40:23,844 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:40:23,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [168509383] [2021-11-23 17:40:23,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:23,844 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:40:23,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:40:23,846 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:40:23,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-23 17:40:23,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:23,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:40:23,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:35,164 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 17:40:35,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:42,916 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 17:40:42,916 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:40:42,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [168509383] [2021-11-23 17:40:42,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [168509383] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:42,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [588197180] [2021-11-23 17:40:42,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:42,917 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:40:42,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:40:42,920 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:40:42,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-23 17:40:43,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:43,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:40:43,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:54,785 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 17:40:54,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:57,205 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 17:40:57,205 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [588197180] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:57,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [851489350] [2021-11-23 17:40:57,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:57,206 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:57,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:40:57,206 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:40:57,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-23 17:40:57,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:57,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:40:57,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:00,508 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 17:41:00,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:01,444 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 17:41:01,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [851489350] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:01,444 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:41:01,445 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 22, 29, 24, 29, 24] total 68 [2021-11-23 17:41:01,445 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401414279] [2021-11-23 17:41:01,445 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:41:01,446 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-23 17:41:01,446 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:41:01,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-23 17:41:01,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=521, Invalid=4035, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 17:41:01,447 INFO L87 Difference]: Start difference. First operand 1184 states and 1525 transitions. Second operand has 68 states, 68 states have (on average 3.1911764705882355) internal successors, (217), 68 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:02,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:41:02,582 INFO L93 Difference]: Finished difference Result 1586 states and 2043 transitions. [2021-11-23 17:41:02,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 17:41:02,583 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.1911764705882355) internal successors, (217), 68 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 17:41:02,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:41:02,588 INFO L225 Difference]: With dead ends: 1586 [2021-11-23 17:41:02,589 INFO L226 Difference]: Without dead ends: 1226 [2021-11-23 17:41:02,590 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 436 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1787 ImplicationChecksByTransitivity, 25.2s TimeCoverageRelationStatistics Valid=565, Invalid=4265, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 17:41:02,591 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 204 mSDsluCounter, 1302 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 1371 SdHoareTripleChecker+Invalid, 541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 194 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:41:02,591 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [204 Valid, 1371 Invalid, 541 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 337 Invalid, 0 Unknown, 194 Unchecked, 0.4s Time] [2021-11-23 17:41:02,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1226 states. [2021-11-23 17:41:02,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1226 to 1184. [2021-11-23 17:41:02,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1184 states, 1183 states have (on average 1.2890955198647507) internal successors, (1525), 1183 states have internal predecessors, (1525), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:02,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1184 states to 1184 states and 1525 transitions. [2021-11-23 17:41:02,670 INFO L78 Accepts]: Start accepts. Automaton has 1184 states and 1525 transitions. Word has length 85 [2021-11-23 17:41:02,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:41:02,671 INFO L470 AbstractCegarLoop]: Abstraction has 1184 states and 1525 transitions. [2021-11-23 17:41:02,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 3.1911764705882355) internal successors, (217), 68 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:02,671 INFO L276 IsEmpty]: Start isEmpty. Operand 1184 states and 1525 transitions. [2021-11-23 17:41:02,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:41:02,672 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:41:02,672 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:41:02,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:02,893 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Ended with exit code 0 [2021-11-23 17:41:03,087 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Ended with exit code 0 [2021-11-23 17:41:03,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:03,286 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:41:03,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:41:03,287 INFO L85 PathProgramCache]: Analyzing trace with hash 293380225, now seen corresponding path program 1 times [2021-11-23 17:41:03,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:41:03,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [158991120] [2021-11-23 17:41:03,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:03,287 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:41:03,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:41:03,288 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:41:03,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 17:41:03,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:03,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:41:03,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:05,498 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:05,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:06,323 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:06,323 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:41:06,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [158991120] [2021-11-23 17:41:06,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [158991120] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:06,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [230934326] [2021-11-23 17:41:06,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:06,324 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:06,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:41:06,325 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:41:06,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2021-11-23 17:41:06,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:06,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:41:06,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:07,878 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:07,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:08,257 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:08,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [230934326] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:08,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966748518] [2021-11-23 17:41:08,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:08,258 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:08,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:41:08,259 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:41:08,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 17:41:08,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:08,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:41:08,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:13,179 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:13,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:15,366 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:15,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1966748518] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:15,366 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:41:15,367 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 11, 9, 23, 21] total 79 [2021-11-23 17:41:15,367 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583469221] [2021-11-23 17:41:15,367 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:41:15,368 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-23 17:41:15,368 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:41:15,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-23 17:41:15,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=819, Invalid=5343, Unknown=0, NotChecked=0, Total=6162 [2021-11-23 17:41:15,370 INFO L87 Difference]: Start difference. First operand 1184 states and 1525 transitions. Second operand has 79 states, 79 states have (on average 5.037974683544304) internal successors, (398), 79 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:17,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:41:17,115 INFO L93 Difference]: Finished difference Result 1652 states and 2143 transitions. [2021-11-23 17:41:17,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:41:17,116 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 5.037974683544304) internal successors, (398), 79 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 17:41:17,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:41:17,119 INFO L225 Difference]: With dead ends: 1652 [2021-11-23 17:41:17,119 INFO L226 Difference]: Without dead ends: 1227 [2021-11-23 17:41:17,121 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 435 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3271 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=1113, Invalid=7443, Unknown=0, NotChecked=0, Total=8556 [2021-11-23 17:41:17,121 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 315 mSDsluCounter, 1464 mSDsCounter, 0 mSdLazyCounter, 343 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 315 SdHoareTripleChecker+Valid, 1544 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 343 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 137 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:41:17,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [315 Valid, 1544 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 343 Invalid, 0 Unknown, 137 Unchecked, 0.3s Time] [2021-11-23 17:41:17,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1227 states. [2021-11-23 17:41:17,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1227 to 1190. [2021-11-23 17:41:17,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1190 states, 1189 states have (on average 1.2884777123633306) internal successors, (1532), 1189 states have internal predecessors, (1532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:17,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1190 states to 1190 states and 1532 transitions. [2021-11-23 17:41:17,195 INFO L78 Accepts]: Start accepts. Automaton has 1190 states and 1532 transitions. Word has length 85 [2021-11-23 17:41:17,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:41:17,196 INFO L470 AbstractCegarLoop]: Abstraction has 1190 states and 1532 transitions. [2021-11-23 17:41:17,196 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 5.037974683544304) internal successors, (398), 79 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:17,196 INFO L276 IsEmpty]: Start isEmpty. Operand 1190 states and 1532 transitions. [2021-11-23 17:41:17,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 17:41:17,197 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:41:17,197 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:41:17,208 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Ended with exit code 0 [2021-11-23 17:41:17,430 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2021-11-23 17:41:17,610 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Ended with exit code 0 [2021-11-23 17:41:17,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:17,809 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:41:17,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:41:17,809 INFO L85 PathProgramCache]: Analyzing trace with hash -1900830153, now seen corresponding path program 1 times [2021-11-23 17:41:17,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:41:17,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1033453852] [2021-11-23 17:41:17,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:17,810 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:41:17,810 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:41:17,811 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:41:17,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 17:41:17,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:17,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:41:17,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:19,172 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:19,173 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:19,490 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:19,490 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:41:19,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1033453852] [2021-11-23 17:41:19,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1033453852] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:19,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1002750504] [2021-11-23 17:41:19,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:19,491 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:19,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:41:19,492 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:41:19,493 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-23 17:41:19,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:19,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:41:19,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:29,030 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:29,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:33,054 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:33,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1002750504] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:33,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893273258] [2021-11-23 17:41:33,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:33,055 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:33,055 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:41:33,056 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:41:33,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-23 17:41:33,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:33,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:41:33,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:34,330 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:34,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:34,536 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:34,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [893273258] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:34,537 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:41:34,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 32, 26, 10, 9] total 71 [2021-11-23 17:41:34,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728455528] [2021-11-23 17:41:34,538 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:41:34,539 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-23 17:41:34,539 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:41:34,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-23 17:41:34,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=566, Invalid=4404, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 17:41:34,541 INFO L87 Difference]: Start difference. First operand 1190 states and 1532 transitions. Second operand has 71 states, 71 states have (on average 4.183098591549296) internal successors, (297), 71 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:41,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:41:41,834 INFO L93 Difference]: Finished difference Result 2857 states and 3598 transitions. [2021-11-23 17:41:41,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-23 17:41:41,834 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 4.183098591549296) internal successors, (297), 71 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-23 17:41:41,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:41:41,838 INFO L225 Difference]: With dead ends: 2857 [2021-11-23 17:41:41,838 INFO L226 Difference]: Without dead ends: 2254 [2021-11-23 17:41:41,840 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 540 GetRequests, 452 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2162 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=898, Invalid=7112, Unknown=0, NotChecked=0, Total=8010 [2021-11-23 17:41:41,841 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 351 mSDsluCounter, 2687 mSDsCounter, 0 mSdLazyCounter, 724 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 351 SdHoareTripleChecker+Valid, 2808 SdHoareTripleChecker+Invalid, 1128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 724 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 389 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:41:41,842 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [351 Valid, 2808 Invalid, 1128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 724 Invalid, 0 Unknown, 389 Unchecked, 0.8s Time] [2021-11-23 17:41:41,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2254 states. [2021-11-23 17:41:41,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2254 to 1089. [2021-11-23 17:41:41,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1089 states, 1088 states have (on average 1.286764705882353) internal successors, (1400), 1088 states have internal predecessors, (1400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:41,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1089 states to 1089 states and 1400 transitions. [2021-11-23 17:41:41,945 INFO L78 Accepts]: Start accepts. Automaton has 1089 states and 1400 transitions. Word has length 86 [2021-11-23 17:41:41,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:41:41,945 INFO L470 AbstractCegarLoop]: Abstraction has 1089 states and 1400 transitions. [2021-11-23 17:41:41,946 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 4.183098591549296) internal successors, (297), 71 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:41,946 INFO L276 IsEmpty]: Start isEmpty. Operand 1089 states and 1400 transitions. [2021-11-23 17:41:41,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 17:41:41,946 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:41:41,947 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] [2021-11-23 17:41:41,948 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:42,155 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Ended with exit code 0 [2021-11-23 17:41:42,372 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2021-11-23 17:41:42,547 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:42,548 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:41:42,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:41:42,548 INFO L85 PathProgramCache]: Analyzing trace with hash 375679120, now seen corresponding path program 1 times [2021-11-23 17:41:42,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:41:42,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [530948680] [2021-11-23 17:41:42,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:42,548 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:41:42,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:41:42,549 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:41:42,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2021-11-23 17:41:42,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:42,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:41:42,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:42,846 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:41:42,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:43,027 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:41:43,027 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:41:43,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [530948680] [2021-11-23 17:41:43,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [530948680] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:43,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [990306425] [2021-11-23 17:41:43,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:43,028 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:43,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:41:43,029 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:41:43,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Waiting until timeout for monitored process [2021-11-23 17:41:43,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:43,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:41:43,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:43,251 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:41:43,251 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:41:43,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [990306425] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:41:43,252 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:41:43,252 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 17:41:43,252 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743033699] [2021-11-23 17:41:43,252 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:41:43,253 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:41:43,253 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:41:43,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:41:43,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:41:43,253 INFO L87 Difference]: Start difference. First operand 1089 states and 1400 transitions. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:43,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:41:43,343 INFO L93 Difference]: Finished difference Result 2072 states and 2681 transitions. [2021-11-23 17:41:43,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:41:43,344 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-23 17:41:43,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:41:43,346 INFO L225 Difference]: With dead ends: 2072 [2021-11-23 17:41:43,347 INFO L226 Difference]: Without dead ends: 1119 [2021-11-23 17:41:43,348 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 250 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 17:41:43,348 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 59 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:41:43,349 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 161 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:41:43,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1119 states. [2021-11-23 17:41:43,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1119 to 1090. [2021-11-23 17:41:43,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1090 states, 1089 states have (on average 1.2736455463728191) internal successors, (1387), 1089 states have internal predecessors, (1387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:43,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1090 states to 1090 states and 1387 transitions. [2021-11-23 17:41:43,437 INFO L78 Accepts]: Start accepts. Automaton has 1090 states and 1387 transitions. Word has length 86 [2021-11-23 17:41:43,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:41:43,437 INFO L470 AbstractCegarLoop]: Abstraction has 1090 states and 1387 transitions. [2021-11-23 17:41:43,437 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:43,438 INFO L276 IsEmpty]: Start isEmpty. Operand 1090 states and 1387 transitions. [2021-11-23 17:41:43,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 17:41:43,439 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:41:43,439 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:41:43,456 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:43,653 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:43,852 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:43,852 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:41:43,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:41:43,852 INFO L85 PathProgramCache]: Analyzing trace with hash -108201548, now seen corresponding path program 1 times [2021-11-23 17:41:43,853 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:41:43,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1600726384] [2021-11-23 17:41:43,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:43,853 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:41:43,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:41:43,854 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:41:43,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Waiting until timeout for monitored process [2021-11-23 17:41:43,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:43,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:41:43,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:45,442 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 17:41:45,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:45,824 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 17:41:45,824 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:41:45,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1600726384] [2021-11-23 17:41:45,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1600726384] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:45,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [604066923] [2021-11-23 17:41:45,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:45,826 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:41:45,826 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:41:45,830 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:41:45,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (66)] Waiting until timeout for monitored process [2021-11-23 17:41:46,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:46,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:41:46,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:47,213 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 17:41:47,213 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:47,420 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 17:41:47,420 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [604066923] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:47,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1232903108] [2021-11-23 17:41:47,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:47,420 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:47,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:41:47,421 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:41:47,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-23 17:41:47,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:47,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:41:47,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:41:51,136 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 17:41:51,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:52,362 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 17:41:52,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1232903108] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:52,363 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:41:52,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 18, 16] total 46 [2021-11-23 17:41:52,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472057004] [2021-11-23 17:41:52,363 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:41:52,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-23 17:41:52,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:41:52,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-23 17:41:52,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=1804, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 17:41:52,365 INFO L87 Difference]: Start difference. First operand 1090 states and 1387 transitions. Second operand has 46 states, 46 states have (on average 5.978260869565218) internal successors, (275), 46 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:52,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:41:52,772 INFO L93 Difference]: Finished difference Result 1482 states and 1896 transitions. [2021-11-23 17:41:52,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 17:41:52,773 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 5.978260869565218) internal successors, (275), 46 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2021-11-23 17:41:52,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:41:52,774 INFO L225 Difference]: With dead ends: 1482 [2021-11-23 17:41:52,775 INFO L226 Difference]: Without dead ends: 1108 [2021-11-23 17:41:52,776 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 466 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 743 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=303, Invalid=2049, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 17:41:52,777 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 150 mSDsluCounter, 1242 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 1324 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 97 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:41:52,777 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 1324 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 147 Invalid, 0 Unknown, 97 Unchecked, 0.1s Time] [2021-11-23 17:41:52,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1108 states. [2021-11-23 17:41:52,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1108 to 1085. [2021-11-23 17:41:52,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1085 states, 1084 states have (on average 1.2739852398523985) internal successors, (1381), 1084 states have internal predecessors, (1381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:52,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1085 states to 1085 states and 1381 transitions. [2021-11-23 17:41:52,868 INFO L78 Accepts]: Start accepts. Automaton has 1085 states and 1381 transitions. Word has length 86 [2021-11-23 17:41:52,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:41:52,869 INFO L470 AbstractCegarLoop]: Abstraction has 1085 states and 1381 transitions. [2021-11-23 17:41:52,869 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 5.978260869565218) internal successors, (275), 46 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:41:52,869 INFO L276 IsEmpty]: Start isEmpty. Operand 1085 states and 1381 transitions. [2021-11-23 17:41:52,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-23 17:41:52,870 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:41:52,871 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] [2021-11-23 17:41:52,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (65)] Forceful destruction successful, exit code 0 [2021-11-23 17:41:53,085 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (66)] Ended with exit code 0 [2021-11-23 17:41:53,309 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2021-11-23 17:41:53,484 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:41:53,484 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:41:53,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:41:53,484 INFO L85 PathProgramCache]: Analyzing trace with hash 588018093, now seen corresponding path program 1 times [2021-11-23 17:41:53,485 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:41:53,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1122505598] [2021-11-23 17:41:53,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:41:53,485 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:41:53,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:41:53,486 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:41:53,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Waiting until timeout for monitored process [2021-11-23 17:41:53,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:41:53,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 17:41:53,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:03,947 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 17:42:03,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:10,468 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 17:42:10,468 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:42:10,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1122505598] [2021-11-23 17:42:10,468 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1122505598] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:10,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1074953183] [2021-11-23 17:42:10,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:10,469 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:42:10,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:42:10,469 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:42:10,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (69)] Waiting until timeout for monitored process [2021-11-23 17:42:10,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:10,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:42:10,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:14,252 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 17:42:14,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:14,863 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 17:42:14,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1074953183] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:14,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1767272845] [2021-11-23 17:42:14,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:14,864 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:42:14,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:42:14,865 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:42:14,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-23 17:42:14,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:14,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:42:14,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:39,836 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 17:42:39,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:45,261 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 17:42:45,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1767272845] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:45,261 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:42:45,262 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 11, 9, 31, 26] total 112 [2021-11-23 17:42:45,262 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679330286] [2021-11-23 17:42:45,262 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:42:45,263 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2021-11-23 17:42:45,263 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:42:45,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2021-11-23 17:42:45,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1098, Invalid=11334, Unknown=0, NotChecked=0, Total=12432 [2021-11-23 17:42:45,265 INFO L87 Difference]: Start difference. First operand 1085 states and 1381 transitions. Second operand has 112 states, 112 states have (on average 3.7410714285714284) internal successors, (419), 112 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:42:49,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:42:49,554 INFO L93 Difference]: Finished difference Result 2595 states and 3262 transitions. [2021-11-23 17:42:49,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-23 17:42:49,555 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 112 states have (on average 3.7410714285714284) internal successors, (419), 112 states have internal predecessors, (419), 0 states have call successors, (0), 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 88 [2021-11-23 17:42:49,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:42:49,557 INFO L225 Difference]: With dead ends: 2595 [2021-11-23 17:42:49,558 INFO L226 Difference]: Without dead ends: 1606 [2021-11-23 17:42:49,560 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 527 GetRequests, 412 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6039 ImplicationChecksByTransitivity, 41.7s TimeCoverageRelationStatistics Valid=1262, Invalid=12310, Unknown=0, NotChecked=0, Total=13572 [2021-11-23 17:42:49,560 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 394 mSDsluCounter, 4260 mSDsCounter, 0 mSdLazyCounter, 939 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 394 SdHoareTripleChecker+Valid, 4374 SdHoareTripleChecker+Invalid, 1735 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 939 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 764 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:42:49,561 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [394 Valid, 4374 Invalid, 1735 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 939 Invalid, 0 Unknown, 764 Unchecked, 1.4s Time] [2021-11-23 17:42:49,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1606 states. [2021-11-23 17:42:49,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1606 to 1076. [2021-11-23 17:42:49,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1076 states, 1075 states have (on average 1.2734883720930232) internal successors, (1369), 1075 states have internal predecessors, (1369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:42:49,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1076 states to 1076 states and 1369 transitions. [2021-11-23 17:42:49,633 INFO L78 Accepts]: Start accepts. Automaton has 1076 states and 1369 transitions. Word has length 88 [2021-11-23 17:42:49,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:42:49,633 INFO L470 AbstractCegarLoop]: Abstraction has 1076 states and 1369 transitions. [2021-11-23 17:42:49,634 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 112 states, 112 states have (on average 3.7410714285714284) internal successors, (419), 112 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:42:49,634 INFO L276 IsEmpty]: Start isEmpty. Operand 1076 states and 1369 transitions. [2021-11-23 17:42:49,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 17:42:49,635 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:42:49,636 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:42:49,657 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Forceful destruction successful, exit code 0 [2021-11-23 17:42:49,850 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (69)] Ended with exit code 0 [2021-11-23 17:42:50,074 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Ended with exit code 0 [2021-11-23 17:42:50,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:42:50,250 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:42:50,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:42:50,251 INFO L85 PathProgramCache]: Analyzing trace with hash 695845254, now seen corresponding path program 1 times [2021-11-23 17:42:50,251 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:42:50,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1262524850] [2021-11-23 17:42:50,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:50,251 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:42:50,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:42:50,252 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:42:50,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (71)] Waiting until timeout for monitored process [2021-11-23 17:42:50,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:50,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:42:50,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:52,330 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:52,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:52,971 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:52,971 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:42:52,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1262524850] [2021-11-23 17:42:52,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1262524850] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:52,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1908454692] [2021-11-23 17:42:52,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:52,972 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:42:52,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:42:52,973 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:42:52,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (72)] Waiting until timeout for monitored process [2021-11-23 17:42:53,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:53,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:42:53,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:54,740 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:54,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:55,207 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:42:55,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1908454692] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:55,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115973536] [2021-11-23 17:42:55,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:55,208 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:42:55,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:42:55,209 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:42:55,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-23 17:42:55,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:55,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:42:55,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:42:56,765 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:42:56,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:42:57,584 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:42:57,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [115973536] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:42:57,584 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:42:57,584 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:42:57,584 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278510325] [2021-11-23 17:42:57,585 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:42:57,585 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:42:57,585 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:42:57,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:42:57,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:42:57,586 INFO L87 Difference]: Start difference. First operand 1076 states and 1369 transitions. Second operand has 34 states, 34 states have (on average 12.470588235294118) internal successors, (424), 33 states have internal predecessors, (424), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:42:58,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:42:58,138 INFO L93 Difference]: Finished difference Result 2090 states and 2675 transitions. [2021-11-23 17:42:58,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:42:58,139 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.470588235294118) internal successors, (424), 33 states have internal predecessors, (424), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 138 [2021-11-23 17:42:58,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:42:58,141 INFO L225 Difference]: With dead ends: 2090 [2021-11-23 17:42:58,141 INFO L226 Difference]: Without dead ends: 1116 [2021-11-23 17:42:58,142 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 836 GetRequests, 794 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=251, Invalid=1641, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:42:58,143 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 203 mSDsluCounter, 1470 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 1566 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 126 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:42:58,143 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [203 Valid, 1566 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 69 Invalid, 0 Unknown, 126 Unchecked, 0.0s Time] [2021-11-23 17:42:58,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1116 states. [2021-11-23 17:42:58,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1116 to 1116. [2021-11-23 17:42:58,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1116 states, 1115 states have (on average 1.2672645739910313) internal successors, (1413), 1115 states have internal predecessors, (1413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:42:58,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1116 states to 1116 states and 1413 transitions. [2021-11-23 17:42:58,215 INFO L78 Accepts]: Start accepts. Automaton has 1116 states and 1413 transitions. Word has length 138 [2021-11-23 17:42:58,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:42:58,215 INFO L470 AbstractCegarLoop]: Abstraction has 1116 states and 1413 transitions. [2021-11-23 17:42:58,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.470588235294118) internal successors, (424), 33 states have internal predecessors, (424), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:42:58,215 INFO L276 IsEmpty]: Start isEmpty. Operand 1116 states and 1413 transitions. [2021-11-23 17:42:58,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 17:42:58,216 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:42:58,216 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:42:58,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Forceful destruction successful, exit code 0 [2021-11-23 17:42:58,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (72)] Forceful destruction successful, exit code 0 [2021-11-23 17:42:58,625 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (71)] Ended with exit code 0 [2021-11-23 17:42:58,817 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:42:58,817 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:42:58,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:42:58,818 INFO L85 PathProgramCache]: Analyzing trace with hash 716604902, now seen corresponding path program 1 times [2021-11-23 17:42:58,818 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:42:58,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1490741314] [2021-11-23 17:42:58,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:42:58,819 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:42:58,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:42:58,820 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:42:58,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Waiting until timeout for monitored process [2021-11-23 17:42:58,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:42:58,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:42:58,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:00,870 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:00,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:01,622 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:01,622 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:43:01,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1490741314] [2021-11-23 17:43:01,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1490741314] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:01,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [964191896] [2021-11-23 17:43:01,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:01,623 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:43:01,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:43:01,623 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:43:01,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (75)] Waiting until timeout for monitored process [2021-11-23 17:43:01,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:01,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:43:01,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:03,478 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:03,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:04,018 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:04,018 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [964191896] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:04,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094772467] [2021-11-23 17:43:04,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:04,018 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:04,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:43:04,019 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:43:04,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-23 17:43:04,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:04,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:43:04,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:05,924 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 38 proven. 75 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:43:05,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:06,528 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 38 proven. 75 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:43:06,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1094772467] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:06,528 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:43:06,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:43:06,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682365346] [2021-11-23 17:43:06,529 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:43:06,530 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:43:06,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:43:06,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:43:06,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:43:06,530 INFO L87 Difference]: Start difference. First operand 1116 states and 1413 transitions. Second operand has 34 states, 34 states have (on average 12.794117647058824) internal successors, (435), 33 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:07,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:43:07,051 INFO L93 Difference]: Finished difference Result 2194 states and 2793 transitions. [2021-11-23 17:43:07,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:43:07,052 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.794117647058824) internal successors, (435), 33 states have internal predecessors, (435), 0 states have call successors, (0), 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 138 [2021-11-23 17:43:07,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:43:07,055 INFO L225 Difference]: With dead ends: 2194 [2021-11-23 17:43:07,055 INFO L226 Difference]: Without dead ends: 1220 [2021-11-23 17:43:07,057 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 836 GetRequests, 793 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=264, Invalid=1716, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:43:07,057 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 152 mSDsluCounter, 1504 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 1604 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 133 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:43:07,058 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 1604 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 73 Invalid, 0 Unknown, 133 Unchecked, 0.0s Time] [2021-11-23 17:43:07,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1220 states. [2021-11-23 17:43:07,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1220 to 1218. [2021-11-23 17:43:07,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1218 states, 1217 states have (on average 1.2555464256368118) internal successors, (1528), 1217 states have internal predecessors, (1528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:07,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1218 states to 1218 states and 1528 transitions. [2021-11-23 17:43:07,169 INFO L78 Accepts]: Start accepts. Automaton has 1218 states and 1528 transitions. Word has length 138 [2021-11-23 17:43:07,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:43:07,169 INFO L470 AbstractCegarLoop]: Abstraction has 1218 states and 1528 transitions. [2021-11-23 17:43:07,170 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.794117647058824) internal successors, (435), 33 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:07,170 INFO L276 IsEmpty]: Start isEmpty. Operand 1218 states and 1528 transitions. [2021-11-23 17:43:07,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 17:43:07,171 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:43:07,172 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:43:07,174 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (75)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:07,382 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Ended with exit code 0 [2021-11-23 17:43:07,598 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Ended with exit code 0 [2021-11-23 17:43:07,774 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:07,774 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:43:07,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:43:07,775 INFO L85 PathProgramCache]: Analyzing trace with hash -173728328, now seen corresponding path program 1 times [2021-11-23 17:43:07,775 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:43:07,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1630226442] [2021-11-23 17:43:07,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:07,776 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:43:07,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:43:07,777 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:43:07,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (77)] Waiting until timeout for monitored process [2021-11-23 17:43:07,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:07,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:43:07,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:10,126 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:10,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:10,636 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:10,636 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:43:10,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1630226442] [2021-11-23 17:43:10,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1630226442] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:10,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1794174018] [2021-11-23 17:43:10,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:10,637 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:43:10,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:43:10,637 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:43:10,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (78)] Waiting until timeout for monitored process [2021-11-23 17:43:10,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:10,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:43:10,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:12,775 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:12,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:13,113 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:13,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1794174018] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:13,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1926855670] [2021-11-23 17:43:13,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:13,114 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:13,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:43:13,115 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:43:13,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2021-11-23 17:43:13,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:13,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:43:13,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:15,056 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:43:15,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:15,780 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:43:15,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1926855670] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:15,781 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:43:15,781 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:43:15,781 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992553311] [2021-11-23 17:43:15,781 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:43:15,782 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:43:15,782 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:43:15,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:43:15,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:43:15,783 INFO L87 Difference]: Start difference. First operand 1218 states and 1528 transitions. Second operand has 34 states, 34 states have (on average 13.235294117647058) internal successors, (450), 33 states have internal predecessors, (450), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:16,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:43:16,329 INFO L93 Difference]: Finished difference Result 2410 states and 3042 transitions. [2021-11-23 17:43:16,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:43:16,329 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 13.235294117647058) internal successors, (450), 33 states have internal predecessors, (450), 0 states have call successors, (0), 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 138 [2021-11-23 17:43:16,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:43:16,331 INFO L225 Difference]: With dead ends: 2410 [2021-11-23 17:43:16,331 INFO L226 Difference]: Without dead ends: 1436 [2021-11-23 17:43:16,333 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 835 GetRequests, 793 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=253, Invalid=1639, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:43:16,333 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 211 mSDsluCounter, 1839 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 1942 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 183 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:43:16,334 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 1942 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 63 Invalid, 0 Unknown, 183 Unchecked, 0.0s Time] [2021-11-23 17:43:16,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1436 states. [2021-11-23 17:43:16,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1436 to 1436. [2021-11-23 17:43:16,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1436 states, 1435 states have (on average 1.2383275261324043) internal successors, (1777), 1435 states have internal predecessors, (1777), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:16,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1436 states to 1436 states and 1777 transitions. [2021-11-23 17:43:16,424 INFO L78 Accepts]: Start accepts. Automaton has 1436 states and 1777 transitions. Word has length 138 [2021-11-23 17:43:16,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:43:16,424 INFO L470 AbstractCegarLoop]: Abstraction has 1436 states and 1777 transitions. [2021-11-23 17:43:16,424 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 13.235294117647058) internal successors, (450), 33 states have internal predecessors, (450), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:16,424 INFO L276 IsEmpty]: Start isEmpty. Operand 1436 states and 1777 transitions. [2021-11-23 17:43:16,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 17:43:16,426 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:43:16,426 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:43:16,457 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:16,652 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (77)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:16,842 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (78)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:17,041 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:43:17,041 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:43:17,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:43:17,042 INFO L85 PathProgramCache]: Analyzing trace with hash -1149521912, now seen corresponding path program 1 times [2021-11-23 17:43:17,042 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:43:17,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1084569169] [2021-11-23 17:43:17,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:17,042 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:43:17,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:43:17,043 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:43:17,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (80)] Waiting until timeout for monitored process [2021-11-23 17:43:17,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:17,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:43:17,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:18,723 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 68 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:43:18,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:19,349 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 68 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:43:19,349 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:43:19,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1084569169] [2021-11-23 17:43:19,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1084569169] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:19,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1998141742] [2021-11-23 17:43:19,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:19,350 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:43:19,350 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:43:19,351 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:43:19,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (81)] Waiting until timeout for monitored process [2021-11-23 17:43:19,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:19,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:43:19,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:22,028 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 39 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:22,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:22,791 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 39 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:22,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1998141742] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:22,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [474704119] [2021-11-23 17:43:22,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:22,792 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:22,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:43:22,794 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:43:22,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-23 17:43:22,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:22,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:43:22,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:24,873 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:43:24,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:25,510 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:43:25,510 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [474704119] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:25,510 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:43:25,511 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:43:25,512 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598894537] [2021-11-23 17:43:25,512 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:43:25,513 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:43:25,513 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:43:25,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:43:25,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:43:25,515 INFO L87 Difference]: Start difference. First operand 1436 states and 1777 transitions. Second operand has 48 states, 48 states have (on average 12.979166666666666) internal successors, (623), 47 states have internal predecessors, (623), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:27,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:43:27,157 INFO L93 Difference]: Finished difference Result 2675 states and 3365 transitions. [2021-11-23 17:43:27,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:43:27,158 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 12.979166666666666) internal successors, (623), 47 states have internal predecessors, (623), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 138 [2021-11-23 17:43:27,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:43:27,160 INFO L225 Difference]: With dead ends: 2675 [2021-11-23 17:43:27,161 INFO L226 Difference]: Without dead ends: 1701 [2021-11-23 17:43:27,162 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 849 GetRequests, 781 SyntacticMatches, 3 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1101 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=451, Invalid=3971, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 17:43:27,162 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 313 mSDsluCounter, 2448 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 313 SdHoareTripleChecker+Valid, 2552 SdHoareTripleChecker+Invalid, 403 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 261 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:43:27,163 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [313 Valid, 2552 Invalid, 403 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 131 Invalid, 0 Unknown, 261 Unchecked, 0.1s Time] [2021-11-23 17:43:27,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1701 states. [2021-11-23 17:43:27,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1701 to 1697. [2021-11-23 17:43:27,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1697 states, 1696 states have (on average 1.2358490566037736) internal successors, (2096), 1696 states have internal predecessors, (2096), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:27,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1697 states to 1697 states and 2096 transitions. [2021-11-23 17:43:27,271 INFO L78 Accepts]: Start accepts. Automaton has 1697 states and 2096 transitions. Word has length 138 [2021-11-23 17:43:27,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:43:27,271 INFO L470 AbstractCegarLoop]: Abstraction has 1697 states and 2096 transitions. [2021-11-23 17:43:27,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 12.979166666666666) internal successors, (623), 47 states have internal predecessors, (623), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:27,272 INFO L276 IsEmpty]: Start isEmpty. Operand 1697 states and 2096 transitions. [2021-11-23 17:43:27,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 17:43:27,273 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:43:27,273 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:43:27,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (80)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:27,475 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (81)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:27,694 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Ended with exit code 0 [2021-11-23 17:43:27,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:27,874 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:43:27,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:43:27,875 INFO L85 PathProgramCache]: Analyzing trace with hash -201548024, now seen corresponding path program 1 times [2021-11-23 17:43:27,875 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:43:27,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1872681914] [2021-11-23 17:43:27,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:27,875 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:43:27,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:43:27,876 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:43:27,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Waiting until timeout for monitored process [2021-11-23 17:43:27,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:27,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:43:27,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:29,548 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 72 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:43:29,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:30,074 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 72 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:43:30,075 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:43:30,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1872681914] [2021-11-23 17:43:30,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1872681914] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:30,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1975548934] [2021-11-23 17:43:30,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:30,075 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:43:30,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:43:30,076 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:43:30,077 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Waiting until timeout for monitored process [2021-11-23 17:43:30,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:30,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:43:30,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:32,634 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:32,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:33,365 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:33,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1975548934] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:33,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [840271397] [2021-11-23 17:43:33,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:33,366 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:33,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:43:33,368 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:43:33,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-23 17:43:33,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:33,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:43:33,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:35,017 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:43:35,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:35,855 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:43:35,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [840271397] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:35,855 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:43:35,855 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:43:35,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785574036] [2021-11-23 17:43:35,856 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:43:35,857 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:43:35,857 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:43:35,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:43:35,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:43:35,858 INFO L87 Difference]: Start difference. First operand 1697 states and 2096 transitions. Second operand has 48 states, 48 states have (on average 12.8125) internal successors, (615), 47 states have internal predecessors, (615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:37,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:43:37,261 INFO L93 Difference]: Finished difference Result 3249 states and 4046 transitions. [2021-11-23 17:43:37,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:43:37,261 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 12.8125) internal successors, (615), 47 states have internal predecessors, (615), 0 states have call successors, (0), 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 138 [2021-11-23 17:43:37,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:43:37,264 INFO L225 Difference]: With dead ends: 3249 [2021-11-23 17:43:37,265 INFO L226 Difference]: Without dead ends: 2275 [2021-11-23 17:43:37,266 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 782 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=407, Invalid=3753, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 17:43:37,266 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 332 mSDsluCounter, 2452 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 332 SdHoareTripleChecker+Valid, 2556 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 314 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:43:37,267 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [332 Valid, 2556 Invalid, 443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 120 Invalid, 0 Unknown, 314 Unchecked, 0.1s Time] [2021-11-23 17:43:37,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2275 states. [2021-11-23 17:43:37,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2275 to 2263. [2021-11-23 17:43:37,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2263 states, 2262 states have (on average 1.2232537577365163) internal successors, (2767), 2262 states have internal predecessors, (2767), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:37,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2263 states to 2263 states and 2767 transitions. [2021-11-23 17:43:37,429 INFO L78 Accepts]: Start accepts. Automaton has 2263 states and 2767 transitions. Word has length 138 [2021-11-23 17:43:37,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:43:37,429 INFO L470 AbstractCegarLoop]: Abstraction has 2263 states and 2767 transitions. [2021-11-23 17:43:37,430 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 12.8125) internal successors, (615), 47 states have internal predecessors, (615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:37,430 INFO L276 IsEmpty]: Start isEmpty. Operand 2263 states and 2767 transitions. [2021-11-23 17:43:37,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 17:43:37,431 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:43:37,432 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:43:37,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:37,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:37,857 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Ended with exit code 0 [2021-11-23 17:43:38,032 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:38,033 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:43:38,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:43:38,033 INFO L85 PathProgramCache]: Analyzing trace with hash 342756872, now seen corresponding path program 1 times [2021-11-23 17:43:38,033 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:43:38,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1739158899] [2021-11-23 17:43:38,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:38,034 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:43:38,034 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:43:38,035 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:43:38,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Waiting until timeout for monitored process [2021-11-23 17:43:38,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:38,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:43:38,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:39,736 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 76 proven. 28 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:43:39,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:40,213 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 76 proven. 28 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:43:40,213 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:43:40,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1739158899] [2021-11-23 17:43:40,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1739158899] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:40,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [269944623] [2021-11-23 17:43:40,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:40,214 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:43:40,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:43:40,215 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:43:40,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Waiting until timeout for monitored process [2021-11-23 17:43:40,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:40,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:43:40,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:42,387 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:42,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:43,085 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:43,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [269944623] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:43,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [43126013] [2021-11-23 17:43:43,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:43,086 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:43,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:43:43,087 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:43:43,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-23 17:43:43,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:43,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:43:43,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:44,755 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:43:44,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:45,543 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:43:45,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [43126013] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:45,543 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:43:45,544 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 49 [2021-11-23 17:43:45,544 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787928540] [2021-11-23 17:43:45,544 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:43:45,545 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-23 17:43:45,545 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:43:45,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-23 17:43:45,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=2242, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:43:45,546 INFO L87 Difference]: Start difference. First operand 2263 states and 2767 transitions. Second operand has 50 states, 50 states have (on average 12.36) internal successors, (618), 49 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 17:43:46,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:43:46,844 INFO L93 Difference]: Finished difference Result 3237 states and 4028 transitions. [2021-11-23 17:43:46,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:43:46,844 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 12.36) internal successors, (618), 49 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 138 [2021-11-23 17:43:46,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:43:46,847 INFO L225 Difference]: With dead ends: 3237 [2021-11-23 17:43:46,848 INFO L226 Difference]: Without dead ends: 2263 [2021-11-23 17:43:46,849 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 847 GetRequests, 781 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1099 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=414, Invalid=4008, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 17:43:46,850 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 179 mSDsluCounter, 1921 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 2002 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 164 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:43:46,850 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [179 Valid, 2002 Invalid, 297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 124 Invalid, 0 Unknown, 164 Unchecked, 0.1s Time] [2021-11-23 17:43:46,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2263 states. [2021-11-23 17:43:47,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2263 to 2263. [2021-11-23 17:43:47,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2263 states, 2262 states have (on average 1.2214854111405835) internal successors, (2763), 2262 states have internal predecessors, (2763), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:47,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2263 states to 2263 states and 2763 transitions. [2021-11-23 17:43:47,051 INFO L78 Accepts]: Start accepts. Automaton has 2263 states and 2763 transitions. Word has length 138 [2021-11-23 17:43:47,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:43:47,053 INFO L470 AbstractCegarLoop]: Abstraction has 2263 states and 2763 transitions. [2021-11-23 17:43:47,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 12.36) internal successors, (618), 49 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 17:43:47,054 INFO L276 IsEmpty]: Start isEmpty. Operand 2263 states and 2763 transitions. [2021-11-23 17:43:47,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 17:43:47,057 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:43:47,057 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:43:47,062 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:47,285 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Ended with exit code 0 [2021-11-23 17:43:47,467 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Ended with exit code 0 [2021-11-23 17:43:47,659 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:43:47,660 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:43:47,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:43:47,660 INFO L85 PathProgramCache]: Analyzing trace with hash -1332740856, now seen corresponding path program 1 times [2021-11-23 17:43:47,660 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:43:47,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [600177582] [2021-11-23 17:43:47,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:47,661 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:43:47,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:43:47,661 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:43:47,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Waiting until timeout for monitored process [2021-11-23 17:43:47,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:47,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:43:47,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:48,955 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 80 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:43:48,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:49,540 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 80 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:43:49,540 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:43:49,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [600177582] [2021-11-23 17:43:49,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [600177582] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:49,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [404569870] [2021-11-23 17:43:49,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:49,541 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:43:49,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:43:49,541 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:43:49,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Waiting until timeout for monitored process [2021-11-23 17:43:49,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:49,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:43:49,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:51,149 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:51,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:51,711 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:43:51,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [404569870] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:51,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052085104] [2021-11-23 17:43:51,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:51,712 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:51,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:43:51,712 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:43:51,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-23 17:43:51,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:51,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:43:51,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:53,184 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:43:53,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:53,999 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:43:54,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1052085104] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:54,000 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:43:54,000 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 17:43:54,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710430370] [2021-11-23 17:43:54,000 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:43:54,001 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 17:43:54,001 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:43:54,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 17:43:54,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:43:54,002 INFO L87 Difference]: Start difference. First operand 2263 states and 2763 transitions. Second operand has 39 states, 39 states have (on average 13.717948717948717) internal successors, (535), 38 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 17:43:54,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:43:54,970 INFO L93 Difference]: Finished difference Result 3239 states and 4025 transitions. [2021-11-23 17:43:54,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:43:54,970 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 13.717948717948717) internal successors, (535), 38 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 138 [2021-11-23 17:43:54,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:43:54,975 INFO L225 Difference]: With dead ends: 3239 [2021-11-23 17:43:54,975 INFO L226 Difference]: Without dead ends: 2265 [2021-11-23 17:43:54,977 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 844 GetRequests, 789 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 731 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=360, Invalid=2610, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:43:54,977 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 238 mSDsluCounter, 1538 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 1625 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 132 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:43:54,978 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [238 Valid, 1625 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 69 Invalid, 0 Unknown, 132 Unchecked, 0.0s Time] [2021-11-23 17:43:54,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2265 states. [2021-11-23 17:43:55,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2265 to 2263. [2021-11-23 17:43:55,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2263 states, 2262 states have (on average 1.2166224580017684) internal successors, (2752), 2262 states have internal predecessors, (2752), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:43:55,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2263 states to 2263 states and 2752 transitions. [2021-11-23 17:43:55,215 INFO L78 Accepts]: Start accepts. Automaton has 2263 states and 2752 transitions. Word has length 138 [2021-11-23 17:43:55,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:43:55,215 INFO L470 AbstractCegarLoop]: Abstraction has 2263 states and 2752 transitions. [2021-11-23 17:43:55,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 13.717948717948717) internal successors, (535), 38 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 17:43:55,216 INFO L276 IsEmpty]: Start isEmpty. Operand 2263 states and 2752 transitions. [2021-11-23 17:43:55,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:43:55,218 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:43:55,219 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:43:55,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:55,435 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Forceful destruction successful, exit code 0 [2021-11-23 17:43:55,652 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Ended with exit code 0 [2021-11-23 17:43:55,832 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:55,832 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:43:55,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:43:55,832 INFO L85 PathProgramCache]: Analyzing trace with hash 879054242, now seen corresponding path program 1 times [2021-11-23 17:43:55,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:43:55,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [221464296] [2021-11-23 17:43:55,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:55,833 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:43:55,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:43:55,834 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:43:55,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Waiting until timeout for monitored process [2021-11-23 17:43:55,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:55,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:43:55,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:57,175 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 56 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:43:57,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:57,558 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 56 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:43:57,558 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:43:57,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [221464296] [2021-11-23 17:43:57,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [221464296] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:57,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1548536894] [2021-11-23 17:43:57,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:57,559 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:43:57,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:43:57,560 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:43:57,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Waiting until timeout for monitored process [2021-11-23 17:43:57,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:57,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:43:57,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:43:58,899 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 56 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:43:58,899 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:43:59,212 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 56 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:43:59,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1548536894] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:43:59,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1216940336] [2021-11-23 17:43:59,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:43:59,213 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:43:59,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:43:59,214 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:43:59,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2021-11-23 17:43:59,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:43:59,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:43:59,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:00,469 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 56 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:44:00,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:00,814 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 56 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:44:00,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1216940336] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:00,815 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:44:00,815 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:44:00,815 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636181139] [2021-11-23 17:44:00,815 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:44:00,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:44:00,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:44:00,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:44:00,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:44:00,816 INFO L87 Difference]: Start difference. First operand 2263 states and 2752 transitions. Second operand has 16 states, 16 states have (on average 14.4375) internal successors, (231), 15 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:01,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:44:01,219 INFO L93 Difference]: Finished difference Result 4585 states and 5734 transitions. [2021-11-23 17:44:01,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:44:01,219 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 14.4375) internal successors, (231), 15 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:44:01,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:44:01,229 INFO L225 Difference]: With dead ends: 4585 [2021-11-23 17:44:01,229 INFO L226 Difference]: Without dead ends: 3497 [2021-11-23 17:44:01,231 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 838 GetRequests, 816 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 17:44:01,232 INFO L933 BasicCegarLoop]: 116 mSDtfsCounter, 131 mSDsluCounter, 858 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 974 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 94 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:44:01,232 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 974 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 82 Invalid, 0 Unknown, 94 Unchecked, 0.0s Time] [2021-11-23 17:44:01,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3497 states. [2021-11-23 17:44:01,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3497 to 3457. [2021-11-23 17:44:01,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3457 states, 3456 states have (on average 1.2355324074074074) internal successors, (4270), 3456 states have internal predecessors, (4270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:01,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3457 states to 3457 states and 4270 transitions. [2021-11-23 17:44:01,585 INFO L78 Accepts]: Start accepts. Automaton has 3457 states and 4270 transitions. Word has length 139 [2021-11-23 17:44:01,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:44:01,586 INFO L470 AbstractCegarLoop]: Abstraction has 3457 states and 4270 transitions. [2021-11-23 17:44:01,586 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 14.4375) internal successors, (231), 15 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:01,586 INFO L276 IsEmpty]: Start isEmpty. Operand 3457 states and 4270 transitions. [2021-11-23 17:44:01,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:44:01,590 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:44:01,590 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:44:01,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Forceful destruction successful, exit code 0 [2021-11-23 17:44:01,825 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Ended with exit code 0 [2021-11-23 17:44:02,019 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Ended with exit code 0 [2021-11-23 17:44:02,218 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:44:02,218 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:44:02,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:44:02,219 INFO L85 PathProgramCache]: Analyzing trace with hash 1034900498, now seen corresponding path program 1 times [2021-11-23 17:44:02,219 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:44:02,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1250127934] [2021-11-23 17:44:02,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:02,219 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:44:02,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:44:02,220 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:44:02,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Waiting until timeout for monitored process [2021-11-23 17:44:02,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:02,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:44:02,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:03,883 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 68 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:44:03,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:04,496 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 68 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:44:04,496 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:44:04,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1250127934] [2021-11-23 17:44:04,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1250127934] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:04,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2014624013] [2021-11-23 17:44:04,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:04,497 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:44:04,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:44:04,498 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:44:04,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Waiting until timeout for monitored process [2021-11-23 17:44:04,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:04,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:44:04,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:06,038 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 39 proven. 54 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:44:06,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:06,495 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 39 proven. 54 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:44:06,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2014624013] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:06,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [269623861] [2021-11-23 17:44:06,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:06,495 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:44:06,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:44:06,496 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:44:06,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2021-11-23 17:44:06,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:06,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:44:06,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:07,798 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 39 proven. 54 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:44:07,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:08,141 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 39 proven. 54 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:44:08,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [269623861] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:08,142 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:44:08,142 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:44:08,142 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937843903] [2021-11-23 17:44:08,142 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:44:08,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:44:08,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:44:08,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:44:08,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:44:08,144 INFO L87 Difference]: Start difference. First operand 3457 states and 4270 transitions. Second operand has 32 states, 32 states have (on average 13.71875) internal successors, (439), 31 states have internal predecessors, (439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:09,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:44:09,430 INFO L93 Difference]: Finished difference Result 6776 states and 8479 transitions. [2021-11-23 17:44:09,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:44:09,430 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 13.71875) internal successors, (439), 31 states have internal predecessors, (439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:44:09,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:44:09,435 INFO L225 Difference]: With dead ends: 6776 [2021-11-23 17:44:09,435 INFO L226 Difference]: Without dead ends: 5542 [2021-11-23 17:44:09,437 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 856 GetRequests, 805 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=313, Invalid=2237, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 17:44:09,438 INFO L933 BasicCegarLoop]: 148 mSDtfsCounter, 344 mSDsluCounter, 2185 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 344 SdHoareTripleChecker+Valid, 2333 SdHoareTripleChecker+Invalid, 524 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 413 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:44:09,438 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [344 Valid, 2333 Invalid, 524 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 104 Invalid, 0 Unknown, 413 Unchecked, 0.1s Time] [2021-11-23 17:44:09,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5542 states. [2021-11-23 17:44:09,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5542 to 5381. [2021-11-23 17:44:09,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5381 states, 5380 states have (on average 1.2475836431226766) internal successors, (6712), 5380 states have internal predecessors, (6712), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:09,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5381 states to 5381 states and 6712 transitions. [2021-11-23 17:44:09,814 INFO L78 Accepts]: Start accepts. Automaton has 5381 states and 6712 transitions. Word has length 139 [2021-11-23 17:44:09,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:44:09,814 INFO L470 AbstractCegarLoop]: Abstraction has 5381 states and 6712 transitions. [2021-11-23 17:44:09,814 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 13.71875) internal successors, (439), 31 states have internal predecessors, (439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:09,815 INFO L276 IsEmpty]: Start isEmpty. Operand 5381 states and 6712 transitions. [2021-11-23 17:44:09,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:44:09,819 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:44:09,819 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:44:09,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Forceful destruction successful, exit code 0 [2021-11-23 17:44:10,042 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Ended with exit code 0 [2021-11-23 17:44:10,236 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Forceful destruction successful, exit code 0 [2021-11-23 17:44:10,434 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:44:10,434 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:44:10,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:44:10,435 INFO L85 PathProgramCache]: Analyzing trace with hash 851681554, now seen corresponding path program 1 times [2021-11-23 17:44:10,435 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:44:10,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1367115934] [2021-11-23 17:44:10,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:10,435 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:44:10,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:44:10,437 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:44:10,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Waiting until timeout for monitored process [2021-11-23 17:44:10,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:10,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:44:10,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:11,219 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 93 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 17:44:11,220 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:44:11,220 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:44:11,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1367115934] [2021-11-23 17:44:11,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1367115934] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:44:11,220 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:44:11,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:44:11,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424308325] [2021-11-23 17:44:11,221 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:44:11,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:44:11,222 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:44:11,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:44:11,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:44:11,222 INFO L87 Difference]: Start difference. First operand 5381 states and 6712 transitions. Second operand has 6 states, 6 states have (on average 21.166666666666668) internal successors, (127), 5 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:11,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:44:11,528 INFO L93 Difference]: Finished difference Result 6357 states and 7974 transitions. [2021-11-23 17:44:11,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:44:11,528 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.166666666666668) internal successors, (127), 5 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:44:11,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:44:11,533 INFO L225 Difference]: With dead ends: 6357 [2021-11-23 17:44:11,533 INFO L226 Difference]: Without dead ends: 5383 [2021-11-23 17:44:11,534 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 134 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 17:44:11,535 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 84 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:44:11,535 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 346 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2 Invalid, 0 Unknown, 81 Unchecked, 0.0s Time] [2021-11-23 17:44:11,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5383 states. [2021-11-23 17:44:11,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5383 to 5381. [2021-11-23 17:44:11,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5381 states, 5380 states have (on average 1.2388475836431228) internal successors, (6665), 5380 states have internal predecessors, (6665), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:11,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5381 states to 5381 states and 6665 transitions. [2021-11-23 17:44:11,872 INFO L78 Accepts]: Start accepts. Automaton has 5381 states and 6665 transitions. Word has length 139 [2021-11-23 17:44:11,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:44:11,873 INFO L470 AbstractCegarLoop]: Abstraction has 5381 states and 6665 transitions. [2021-11-23 17:44:11,873 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.166666666666668) internal successors, (127), 5 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:11,873 INFO L276 IsEmpty]: Start isEmpty. Operand 5381 states and 6665 transitions. [2021-11-23 17:44:11,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:44:11,877 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:44:11,878 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:44:11,901 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Forceful destruction successful, exit code 0 [2021-11-23 17:44:12,090 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:44:12,090 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:44:12,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:44:12,091 INFO L85 PathProgramCache]: Analyzing trace with hash -389713095, now seen corresponding path program 1 times [2021-11-23 17:44:12,091 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:44:12,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [682051963] [2021-11-23 17:44:12,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:12,091 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:44:12,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:44:12,092 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:44:12,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (99)] Waiting until timeout for monitored process [2021-11-23 17:44:12,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:12,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:44:12,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:14,332 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 30 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:14,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:14,866 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 30 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:14,866 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:44:14,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [682051963] [2021-11-23 17:44:14,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [682051963] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:14,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [523814772] [2021-11-23 17:44:14,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:14,867 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:44:14,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:44:14,868 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:44:14,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (100)] Waiting until timeout for monitored process [2021-11-23 17:44:15,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:15,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:44:15,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:17,119 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 30 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:17,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:17,447 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 30 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:17,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [523814772] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:17,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [873382469] [2021-11-23 17:44:17,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:17,447 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:44:17,447 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:44:17,449 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:44:17,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2021-11-23 17:44:17,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:17,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:44:17,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:19,280 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 30 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:44:19,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:19,958 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 30 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:44:19,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [873382469] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:19,958 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:44:19,959 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:44:19,959 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490696753] [2021-11-23 17:44:19,959 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:44:19,959 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:44:19,959 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:44:19,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:44:19,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:44:19,960 INFO L87 Difference]: Start difference. First operand 5381 states and 6665 transitions. Second operand has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:20,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:44:20,635 INFO L93 Difference]: Finished difference Result 7648 states and 9537 transitions. [2021-11-23 17:44:20,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:44:20,636 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:44:20,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:44:20,641 INFO L225 Difference]: With dead ends: 7648 [2021-11-23 17:44:20,641 INFO L226 Difference]: Without dead ends: 5451 [2021-11-23 17:44:20,645 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 842 GetRequests, 800 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=244, Invalid=1648, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:44:20,645 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 122 mSDsluCounter, 1972 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 2074 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 110 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:44:20,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 2074 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 23 Invalid, 0 Unknown, 110 Unchecked, 0.0s Time] [2021-11-23 17:44:20,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5451 states. [2021-11-23 17:44:21,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5451 to 5390. [2021-11-23 17:44:21,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5390 states, 5389 states have (on average 1.2388198181480794) internal successors, (6676), 5389 states have internal predecessors, (6676), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:21,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5390 states to 5390 states and 6676 transitions. [2021-11-23 17:44:21,033 INFO L78 Accepts]: Start accepts. Automaton has 5390 states and 6676 transitions. Word has length 139 [2021-11-23 17:44:21,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:44:21,034 INFO L470 AbstractCegarLoop]: Abstraction has 5390 states and 6676 transitions. [2021-11-23 17:44:21,034 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:21,034 INFO L276 IsEmpty]: Start isEmpty. Operand 5390 states and 6676 transitions. [2021-11-23 17:44:21,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:44:21,037 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:44:21,038 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:44:21,047 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (99)] Ended with exit code 0 [2021-11-23 17:44:21,267 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Forceful destruction successful, exit code 0 [2021-11-23 17:44:21,450 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (100)] Ended with exit code 0 [2021-11-23 17:44:21,649 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:44:21,649 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:44:21,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:44:21,650 INFO L85 PathProgramCache]: Analyzing trace with hash 1883281131, now seen corresponding path program 1 times [2021-11-23 17:44:21,650 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:44:21,650 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1836350923] [2021-11-23 17:44:21,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:21,650 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:44:21,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:44:21,651 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:44:21,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Waiting until timeout for monitored process [2021-11-23 17:44:21,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:21,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:44:21,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:23,982 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 95 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:23,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:24,592 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 95 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:24,593 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:44:24,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1836350923] [2021-11-23 17:44:24,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1836350923] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:24,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [851993003] [2021-11-23 17:44:24,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:24,593 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:44:24,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:44:24,594 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:44:24,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Waiting until timeout for monitored process [2021-11-23 17:44:24,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:24,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:44:24,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:26,917 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 95 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:26,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:27,334 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 95 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:27,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [851993003] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:27,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1344971870] [2021-11-23 17:44:27,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:27,335 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:44:27,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:44:27,337 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:44:27,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2021-11-23 17:44:27,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:27,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:44:27,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:29,247 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 89 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:44:29,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:29,981 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 89 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:44:29,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1344971870] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:29,981 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:44:29,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:44:29,982 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107078911] [2021-11-23 17:44:29,982 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:44:29,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:44:29,982 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:44:29,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:44:29,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:44:29,983 INFO L87 Difference]: Start difference. First operand 5390 states and 6676 transitions. Second operand has 34 states, 34 states have (on average 13.529411764705882) internal successors, (460), 33 states have internal predecessors, (460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:30,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:44:30,810 INFO L93 Difference]: Finished difference Result 7840 states and 9786 transitions. [2021-11-23 17:44:30,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:44:30,810 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 13.529411764705882) internal successors, (460), 33 states have internal predecessors, (460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:44:30,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:44:30,816 INFO L225 Difference]: With dead ends: 7840 [2021-11-23 17:44:30,816 INFO L226 Difference]: Without dead ends: 5782 [2021-11-23 17:44:30,819 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 842 GetRequests, 800 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 17:44:30,820 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 317 mSDsluCounter, 1715 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 317 SdHoareTripleChecker+Valid, 1820 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 104 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:44:30,820 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [317 Valid, 1820 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 18 Invalid, 0 Unknown, 104 Unchecked, 0.0s Time] [2021-11-23 17:44:30,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5782 states. [2021-11-23 17:44:31,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5782 to 5782. [2021-11-23 17:44:31,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5782 states, 5781 states have (on average 1.2357723577235773) internal successors, (7144), 5781 states have internal predecessors, (7144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:31,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5782 states to 5782 states and 7144 transitions. [2021-11-23 17:44:31,180 INFO L78 Accepts]: Start accepts. Automaton has 5782 states and 7144 transitions. Word has length 139 [2021-11-23 17:44:31,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:44:31,181 INFO L470 AbstractCegarLoop]: Abstraction has 5782 states and 7144 transitions. [2021-11-23 17:44:31,181 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 13.529411764705882) internal successors, (460), 33 states have internal predecessors, (460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:31,181 INFO L276 IsEmpty]: Start isEmpty. Operand 5782 states and 7144 transitions. [2021-11-23 17:44:31,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:44:31,184 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:44:31,185 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:44:31,186 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Forceful destruction successful, exit code 0 [2021-11-23 17:44:31,409 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Ended with exit code 0 [2021-11-23 17:44:31,597 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Forceful destruction successful, exit code 0 [2021-11-23 17:44:31,790 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:44:31,790 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:44:31,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:44:31,791 INFO L85 PathProgramCache]: Analyzing trace with hash -1347032146, now seen corresponding path program 1 times [2021-11-23 17:44:31,791 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:44:31,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1358769927] [2021-11-23 17:44:31,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:31,792 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:44:31,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:44:31,793 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:44:31,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Waiting until timeout for monitored process [2021-11-23 17:44:31,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:31,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:44:31,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:34,331 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 95 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:34,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:34,971 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 95 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:34,972 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:44:34,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1358769927] [2021-11-23 17:44:34,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1358769927] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:34,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [898618390] [2021-11-23 17:44:34,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:34,972 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:44:34,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:44:34,973 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:44:34,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Waiting until timeout for monitored process [2021-11-23 17:44:35,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:35,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:44:35,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:37,421 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 95 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:37,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:37,846 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 95 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:37,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [898618390] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:37,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63075595] [2021-11-23 17:44:37,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:37,847 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:44:37,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:44:37,848 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:44:37,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Waiting until timeout for monitored process [2021-11-23 17:44:37,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:37,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:44:37,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:39,863 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 89 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:44:39,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:40,608 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 89 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:44:40,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63075595] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:40,609 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:44:40,609 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:44:40,609 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773833866] [2021-11-23 17:44:40,610 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:44:40,610 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:44:40,610 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:44:40,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:44:40,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:44:40,611 INFO L87 Difference]: Start difference. First operand 5782 states and 7144 transitions. Second operand has 34 states, 34 states have (on average 13.529411764705882) internal successors, (460), 33 states have internal predecessors, (460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:41,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:44:41,385 INFO L93 Difference]: Finished difference Result 7888 states and 9827 transitions. [2021-11-23 17:44:41,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:44:41,385 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 13.529411764705882) internal successors, (460), 33 states have internal predecessors, (460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:44:41,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:44:41,390 INFO L225 Difference]: With dead ends: 7888 [2021-11-23 17:44:41,390 INFO L226 Difference]: Without dead ends: 5830 [2021-11-23 17:44:41,392 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 841 GetRequests, 799 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=250, Invalid=1642, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:44:41,392 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 133 mSDsluCounter, 1990 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 2093 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 118 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:44:41,393 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 2093 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 36 Invalid, 0 Unknown, 118 Unchecked, 0.0s Time] [2021-11-23 17:44:41,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5830 states. [2021-11-23 17:44:41,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5830 to 5798. [2021-11-23 17:44:41,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5798 states, 5797 states have (on average 1.234086596515439) internal successors, (7154), 5797 states have internal predecessors, (7154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:41,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5798 states to 5798 states and 7154 transitions. [2021-11-23 17:44:41,751 INFO L78 Accepts]: Start accepts. Automaton has 5798 states and 7154 transitions. Word has length 139 [2021-11-23 17:44:41,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:44:41,752 INFO L470 AbstractCegarLoop]: Abstraction has 5798 states and 7154 transitions. [2021-11-23 17:44:41,752 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 13.529411764705882) internal successors, (460), 33 states have internal predecessors, (460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:41,752 INFO L276 IsEmpty]: Start isEmpty. Operand 5798 states and 7154 transitions. [2021-11-23 17:44:41,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:44:41,757 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:44:41,757 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:44:41,810 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Forceful destruction successful, exit code 0 [2021-11-23 17:44:41,997 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Forceful destruction successful, exit code 0 [2021-11-23 17:44:42,183 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Forceful destruction successful, exit code 0 [2021-11-23 17:44:42,382 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:44:42,382 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:44:42,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:44:42,383 INFO L85 PathProgramCache]: Analyzing trace with hash -908521322, now seen corresponding path program 1 times [2021-11-23 17:44:42,383 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:44:42,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [183085871] [2021-11-23 17:44:42,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:42,383 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:44:42,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:44:42,384 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:44:42,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Waiting until timeout for monitored process [2021-11-23 17:44:42,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:42,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:44:42,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:44,411 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 39 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:44,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:45,168 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 39 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:45,168 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:44:45,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [183085871] [2021-11-23 17:44:45,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [183085871] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:45,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1465064110] [2021-11-23 17:44:45,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:45,169 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:44:45,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:44:45,170 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:44:45,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Waiting until timeout for monitored process [2021-11-23 17:44:45,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:45,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:44:45,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:47,398 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 39 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:47,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:47,924 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 39 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:44:47,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1465064110] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:47,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1762866633] [2021-11-23 17:44:47,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:47,925 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:44:47,925 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:44:47,926 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:44:47,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2021-11-23 17:44:48,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:48,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:44:48,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:49,908 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 39 proven. 75 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:44:49,908 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:50,567 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 39 proven. 75 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:44:50,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1762866633] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:50,568 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:44:50,568 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:44:50,568 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727232019] [2021-11-23 17:44:50,568 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:44:50,569 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:44:50,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:44:50,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:44:50,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:44:50,570 INFO L87 Difference]: Start difference. First operand 5798 states and 7154 transitions. Second operand has 34 states, 34 states have (on average 12.764705882352942) internal successors, (434), 33 states have internal predecessors, (434), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:51,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:44:51,437 INFO L93 Difference]: Finished difference Result 6853 states and 8503 transitions. [2021-11-23 17:44:51,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:44:51,437 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.764705882352942) internal successors, (434), 33 states have internal predecessors, (434), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:44:51,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:44:51,443 INFO L225 Difference]: With dead ends: 6853 [2021-11-23 17:44:51,443 INFO L226 Difference]: Without dead ends: 5821 [2021-11-23 17:44:51,445 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 841 GetRequests, 798 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=274, Invalid=1706, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:44:51,445 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 243 mSDsluCounter, 1491 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 1590 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 139 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:44:51,446 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [243 Valid, 1590 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 59 Invalid, 0 Unknown, 139 Unchecked, 0.1s Time] [2021-11-23 17:44:51,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5821 states. [2021-11-23 17:44:51,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5821 to 5777. [2021-11-23 17:44:51,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5777 states, 5776 states have (on average 1.2333795013850415) internal successors, (7124), 5776 states have internal predecessors, (7124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:51,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5777 states to 5777 states and 7124 transitions. [2021-11-23 17:44:51,831 INFO L78 Accepts]: Start accepts. Automaton has 5777 states and 7124 transitions. Word has length 139 [2021-11-23 17:44:51,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:44:51,832 INFO L470 AbstractCegarLoop]: Abstraction has 5777 states and 7124 transitions. [2021-11-23 17:44:51,832 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.764705882352942) internal successors, (434), 33 states have internal predecessors, (434), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:51,832 INFO L276 IsEmpty]: Start isEmpty. Operand 5777 states and 7124 transitions. [2021-11-23 17:44:51,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:44:51,837 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:44:51,837 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:44:51,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Forceful destruction successful, exit code 0 [2021-11-23 17:44:52,051 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Ended with exit code 0 [2021-11-23 17:44:52,258 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Ended with exit code 0 [2021-11-23 17:44:52,450 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:44:52,450 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:44:52,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:44:52,451 INFO L85 PathProgramCache]: Analyzing trace with hash 2018726235, now seen corresponding path program 1 times [2021-11-23 17:44:52,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:44:52,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1232525863] [2021-11-23 17:44:52,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:52,451 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:44:52,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:44:52,452 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:44:52,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Waiting until timeout for monitored process [2021-11-23 17:44:52,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:52,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:44:52,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:53,539 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:44:53,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:54,116 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:44:54,116 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:44:54,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1232525863] [2021-11-23 17:44:54,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1232525863] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:54,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1787612024] [2021-11-23 17:44:54,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:54,117 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:44:54,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:44:54,118 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:44:54,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (112)] Waiting until timeout for monitored process [2021-11-23 17:44:54,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:54,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:44:54,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:55,294 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:44:55,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:55,784 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:44:55,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1787612024] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:55,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [525570143] [2021-11-23 17:44:55,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:55,785 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:44:55,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:44:55,786 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:44:55,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Waiting until timeout for monitored process [2021-11-23 17:44:55,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:55,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:44:55,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:44:56,955 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:44:56,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:44:57,524 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 42 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:44:57,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [525570143] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:44:57,525 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:44:57,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:44:57,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135873144] [2021-11-23 17:44:57,525 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:44:57,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:44:57,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:44:57,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:44:57,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:44:57,527 INFO L87 Difference]: Start difference. First operand 5777 states and 7124 transitions. Second operand has 16 states, 16 states have (on average 12.5625) internal successors, (201), 15 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:58,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:44:58,190 INFO L93 Difference]: Finished difference Result 8862 states and 11049 transitions. [2021-11-23 17:44:58,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:44:58,191 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 12.5625) internal successors, (201), 15 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:44:58,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:44:58,199 INFO L225 Difference]: With dead ends: 8862 [2021-11-23 17:44:58,199 INFO L226 Difference]: Without dead ends: 7866 [2021-11-23 17:44:58,201 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 837 GetRequests, 815 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 17:44:58,202 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 161 mSDsluCounter, 822 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 920 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 105 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:44:58,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [161 Valid, 920 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 40 Invalid, 0 Unknown, 105 Unchecked, 0.0s Time] [2021-11-23 17:44:58,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7866 states. [2021-11-23 17:44:58,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7866 to 7814. [2021-11-23 17:44:58,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7814 states, 7813 states have (on average 1.2392166901318316) internal successors, (9682), 7813 states have internal predecessors, (9682), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:58,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7814 states to 7814 states and 9682 transitions. [2021-11-23 17:44:58,737 INFO L78 Accepts]: Start accepts. Automaton has 7814 states and 9682 transitions. Word has length 139 [2021-11-23 17:44:58,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:44:58,737 INFO L470 AbstractCegarLoop]: Abstraction has 7814 states and 9682 transitions. [2021-11-23 17:44:58,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 12.5625) internal successors, (201), 15 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:44:58,738 INFO L276 IsEmpty]: Start isEmpty. Operand 7814 states and 9682 transitions. [2021-11-23 17:44:58,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:44:58,740 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:44:58,741 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:44:58,761 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Ended with exit code 0 [2021-11-23 17:44:58,953 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Forceful destruction successful, exit code 0 [2021-11-23 17:44:59,143 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (112)] Ended with exit code 0 [2021-11-23 17:44:59,341 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:44:59,342 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:44:59,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:44:59,342 INFO L85 PathProgramCache]: Analyzing trace with hash 309408747, now seen corresponding path program 1 times [2021-11-23 17:44:59,343 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:44:59,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [51010638] [2021-11-23 17:44:59,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:44:59,343 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:44:59,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:44:59,344 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:44:59,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (114)] Waiting until timeout for monitored process [2021-11-23 17:44:59,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:44:59,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:44:59,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:00,198 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 100 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 17:45:00,198 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:45:00,198 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:45:00,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [51010638] [2021-11-23 17:45:00,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [51010638] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:45:00,198 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:45:00,198 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:45:00,199 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454352532] [2021-11-23 17:45:00,199 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:45:00,199 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:45:00,199 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:45:00,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:45:00,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:45:00,200 INFO L87 Difference]: Start difference. First operand 7814 states and 9682 transitions. Second operand has 6 states, 6 states have (on average 21.666666666666668) internal successors, (130), 5 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:00,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:45:00,728 INFO L93 Difference]: Finished difference Result 9810 states and 12240 transitions. [2021-11-23 17:45:00,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:45:00,728 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.666666666666668) internal successors, (130), 5 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:45:00,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:45:00,736 INFO L225 Difference]: With dead ends: 9810 [2021-11-23 17:45:00,736 INFO L226 Difference]: Without dead ends: 8836 [2021-11-23 17:45:00,738 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 134 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 17:45:00,739 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 84 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 281 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 39 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:45:00,739 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 281 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 0 Unknown, 39 Unchecked, 0.0s Time] [2021-11-23 17:45:00,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8836 states. [2021-11-23 17:45:01,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8836 to 8786. [2021-11-23 17:45:01,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8786 states, 8785 states have (on average 1.2388161639157655) internal successors, (10883), 8785 states have internal predecessors, (10883), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:01,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8786 states to 8786 states and 10883 transitions. [2021-11-23 17:45:01,316 INFO L78 Accepts]: Start accepts. Automaton has 8786 states and 10883 transitions. Word has length 139 [2021-11-23 17:45:01,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:45:01,317 INFO L470 AbstractCegarLoop]: Abstraction has 8786 states and 10883 transitions. [2021-11-23 17:45:01,317 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.666666666666668) internal successors, (130), 5 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:01,317 INFO L276 IsEmpty]: Start isEmpty. Operand 8786 states and 10883 transitions. [2021-11-23 17:45:01,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:45:01,320 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:45:01,320 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:45:01,327 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (114)] Ended with exit code 0 [2021-11-23 17:45:01,520 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:45:01,520 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:45:01,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:45:01,521 INFO L85 PathProgramCache]: Analyzing trace with hash 1257382635, now seen corresponding path program 1 times [2021-11-23 17:45:01,521 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:45:01,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [980232848] [2021-11-23 17:45:01,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:01,521 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:45:01,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:45:01,522 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:45:01,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (115)] Waiting until timeout for monitored process [2021-11-23 17:45:01,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:01,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:45:01,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:03,183 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 73 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:45:03,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:45:03,730 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 73 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:45:03,731 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:45:03,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [980232848] [2021-11-23 17:45:03,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [980232848] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:45:03,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1974613544] [2021-11-23 17:45:03,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:03,731 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:45:03,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:45:03,732 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:45:03,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (116)] Waiting until timeout for monitored process [2021-11-23 17:45:03,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:03,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:45:03,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:05,080 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 48 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:45:05,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:45:05,711 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 48 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:45:05,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1974613544] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:45:05,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [396799517] [2021-11-23 17:45:05,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:05,711 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:45:05,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:45:05,712 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:45:05,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Waiting until timeout for monitored process [2021-11-23 17:45:05,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:05,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:45:05,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:06,875 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 48 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:45:06,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:45:07,432 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 48 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:45:07,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [396799517] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:45:07,432 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:45:07,433 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:45:07,433 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261125236] [2021-11-23 17:45:07,433 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:45:07,434 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:45:07,434 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:45:07,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:45:07,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:45:07,435 INFO L87 Difference]: Start difference. First operand 8786 states and 10883 transitions. Second operand has 32 states, 32 states have (on average 12.375) internal successors, (396), 31 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:09,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:45:09,139 INFO L93 Difference]: Finished difference Result 12306 states and 15309 transitions. [2021-11-23 17:45:09,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:45:09,139 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 12.375) internal successors, (396), 31 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:45:09,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:45:09,150 INFO L225 Difference]: With dead ends: 12306 [2021-11-23 17:45:09,150 INFO L226 Difference]: Without dead ends: 11332 [2021-11-23 17:45:09,154 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 855 GetRequests, 803 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 589 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=311, Invalid=2341, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 17:45:09,154 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 240 mSDsluCounter, 1812 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 1934 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 172 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:45:09,154 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [240 Valid, 1934 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 106 Invalid, 0 Unknown, 172 Unchecked, 0.1s Time] [2021-11-23 17:45:09,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11332 states. [2021-11-23 17:45:09,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11332 to 11288. [2021-11-23 17:45:09,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11288 states, 11287 states have (on average 1.2396562416939843) internal successors, (13992), 11287 states have internal predecessors, (13992), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:09,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11288 states to 11288 states and 13992 transitions. [2021-11-23 17:45:09,943 INFO L78 Accepts]: Start accepts. Automaton has 11288 states and 13992 transitions. Word has length 139 [2021-11-23 17:45:09,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:45:09,943 INFO L470 AbstractCegarLoop]: Abstraction has 11288 states and 13992 transitions. [2021-11-23 17:45:09,944 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 12.375) internal successors, (396), 31 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:09,944 INFO L276 IsEmpty]: Start isEmpty. Operand 11288 states and 13992 transitions. [2021-11-23 17:45:09,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:45:09,947 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:45:09,947 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:45:09,955 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (115)] Ended with exit code 0 [2021-11-23 17:45:10,149 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (116)] Forceful destruction successful, exit code 0 [2021-11-23 17:45:10,373 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Forceful destruction successful, exit code 0 [2021-11-23 17:45:10,548 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:45:10,548 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:45:10,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:45:10,548 INFO L85 PathProgramCache]: Analyzing trace with hash 1801687531, now seen corresponding path program 1 times [2021-11-23 17:45:10,549 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:45:10,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [732595419] [2021-11-23 17:45:10,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:10,549 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:45:10,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:45:10,550 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:45:10,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (118)] Waiting until timeout for monitored process [2021-11-23 17:45:10,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:10,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:45:10,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:12,177 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:45:12,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:45:12,630 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:45:12,630 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:45:12,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [732595419] [2021-11-23 17:45:12,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [732595419] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:45:12,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1182022393] [2021-11-23 17:45:12,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:12,631 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:45:12,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:45:12,632 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:45:12,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (119)] Waiting until timeout for monitored process [2021-11-23 17:45:12,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:12,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:45:12,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:14,023 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 48 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:45:14,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:45:14,708 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 48 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:45:14,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1182022393] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:45:14,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1103363623] [2021-11-23 17:45:14,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:14,709 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:45:14,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:45:14,710 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:45:14,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Waiting until timeout for monitored process [2021-11-23 17:45:14,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:14,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:45:14,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:15,965 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 48 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:45:15,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:45:16,528 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 48 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:45:16,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1103363623] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:45:16,529 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:45:16,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:45:16,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323831739] [2021-11-23 17:45:16,529 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:45:16,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:45:16,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:45:16,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:45:16,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:45:16,532 INFO L87 Difference]: Start difference. First operand 11288 states and 13992 transitions. Second operand has 32 states, 32 states have (on average 12.46875) internal successors, (399), 31 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:18,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:45:18,495 INFO L93 Difference]: Finished difference Result 17896 states and 22260 transitions. [2021-11-23 17:45:18,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:45:18,495 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 12.46875) internal successors, (399), 31 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:45:18,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:45:18,517 INFO L225 Difference]: With dead ends: 17896 [2021-11-23 17:45:18,518 INFO L226 Difference]: Without dead ends: 16922 [2021-11-23 17:45:18,522 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 855 GetRequests, 803 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 586 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=297, Invalid=2355, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 17:45:18,523 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 192 mSDsluCounter, 2218 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 2337 SdHoareTripleChecker+Invalid, 319 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 250 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:45:18,523 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [192 Valid, 2337 Invalid, 319 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 66 Invalid, 0 Unknown, 250 Unchecked, 0.1s Time] [2021-11-23 17:45:18,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16922 states. [2021-11-23 17:45:19,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16922 to 16878. [2021-11-23 17:45:19,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16878 states, 16877 states have (on average 1.2409195947147005) internal successors, (20943), 16877 states have internal predecessors, (20943), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:19,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16878 states to 16878 states and 20943 transitions. [2021-11-23 17:45:19,643 INFO L78 Accepts]: Start accepts. Automaton has 16878 states and 20943 transitions. Word has length 139 [2021-11-23 17:45:19,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:45:19,643 INFO L470 AbstractCegarLoop]: Abstraction has 16878 states and 20943 transitions. [2021-11-23 17:45:19,643 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 12.46875) internal successors, (399), 31 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:19,643 INFO L276 IsEmpty]: Start isEmpty. Operand 16878 states and 20943 transitions. [2021-11-23 17:45:19,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:45:19,647 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:45:19,647 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:45:19,649 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (119)] Ended with exit code 0 [2021-11-23 17:45:19,867 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Ended with exit code 0 [2021-11-23 17:45:20,055 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (118)] Ended with exit code 0 [2021-11-23 17:45:20,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:45:20,250 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:45:20,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:45:20,251 INFO L85 PathProgramCache]: Analyzing trace with hash 126189803, now seen corresponding path program 1 times [2021-11-23 17:45:20,251 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:45:20,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [246550332] [2021-11-23 17:45:20,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:20,251 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:45:20,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:45:20,252 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:45:20,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (121)] Waiting until timeout for monitored process [2021-11-23 17:45:20,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:20,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:45:20,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:21,472 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 81 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:45:21,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:45:22,039 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 81 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:45:22,039 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:45:22,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [246550332] [2021-11-23 17:45:22,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [246550332] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:45:22,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [815016434] [2021-11-23 17:45:22,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:22,040 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:45:22,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:45:22,040 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:45:22,042 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (122)] Waiting until timeout for monitored process [2021-11-23 17:45:22,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:22,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:45:22,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:23,073 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 48 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:45:23,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:45:23,513 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 48 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:45:23,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [815016434] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:45:23,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [761824973] [2021-11-23 17:45:23,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:23,513 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:45:23,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:45:23,514 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:45:23,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Waiting until timeout for monitored process [2021-11-23 17:45:23,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:23,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:45:23,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:24,530 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 48 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:45:24,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:45:25,034 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 48 proven. 28 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 17:45:25,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [761824973] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:45:25,034 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:45:25,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 19 [2021-11-23 17:45:25,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991511000] [2021-11-23 17:45:25,034 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:45:25,035 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 17:45:25,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:45:25,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 17:45:25,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:45:25,036 INFO L87 Difference]: Start difference. First operand 16878 states and 20943 transitions. Second operand has 20 states, 20 states have (on average 14.2) internal successors, (284), 19 states have internal predecessors, (284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:26,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:45:26,325 INFO L93 Difference]: Finished difference Result 20542 states and 25540 transitions. [2021-11-23 17:45:26,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 17:45:26,326 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 14.2) internal successors, (284), 19 states have internal predecessors, (284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:45:26,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:45:26,345 INFO L225 Difference]: With dead ends: 20542 [2021-11-23 17:45:26,345 INFO L226 Difference]: Without dead ends: 19568 [2021-11-23 17:45:26,350 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 841 GetRequests, 813 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=152, Invalid=718, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:45:26,350 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 229 mSDsluCounter, 974 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 1095 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 87 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:45:26,350 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [229 Valid, 1095 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 59 Invalid, 0 Unknown, 87 Unchecked, 0.0s Time] [2021-11-23 17:45:26,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19568 states. [2021-11-23 17:45:27,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19568 to 19562. [2021-11-23 17:45:27,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19562 states, 19561 states have (on average 1.237360053167016) internal successors, (24204), 19561 states have internal predecessors, (24204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:27,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19562 states to 19562 states and 24204 transitions. [2021-11-23 17:45:27,766 INFO L78 Accepts]: Start accepts. Automaton has 19562 states and 24204 transitions. Word has length 139 [2021-11-23 17:45:27,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:45:27,766 INFO L470 AbstractCegarLoop]: Abstraction has 19562 states and 24204 transitions. [2021-11-23 17:45:27,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 14.2) internal successors, (284), 19 states have internal predecessors, (284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:27,767 INFO L276 IsEmpty]: Start isEmpty. Operand 19562 states and 24204 transitions. [2021-11-23 17:45:27,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:45:27,771 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:45:27,771 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:45:27,791 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Ended with exit code 0 [2021-11-23 17:45:27,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (121)] Forceful destruction successful, exit code 0 [2021-11-23 17:45:28,173 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (122)] Ended with exit code 0 [2021-11-23 17:45:28,371 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:45:28,372 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:45:28,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:45:28,372 INFO L85 PathProgramCache]: Analyzing trace with hash -440679566, now seen corresponding path program 1 times [2021-11-23 17:45:28,373 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:45:28,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [510346934] [2021-11-23 17:45:28,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:28,373 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:45:28,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:45:28,374 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:45:28,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (124)] Waiting until timeout for monitored process [2021-11-23 17:45:28,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:28,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:45:28,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:29,142 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 97 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:45:29,142 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:45:29,142 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:45:29,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [510346934] [2021-11-23 17:45:29,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [510346934] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:45:29,142 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:45:29,142 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:45:29,142 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971143883] [2021-11-23 17:45:29,142 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:45:29,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:45:29,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:45:29,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:45:29,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:45:29,143 INFO L87 Difference]: Start difference. First operand 19562 states and 24204 transitions. Second operand has 6 states, 6 states have (on average 21.5) internal successors, (129), 5 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:30,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:45:30,665 INFO L93 Difference]: Finished difference Result 30904 states and 38383 transitions. [2021-11-23 17:45:30,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:45:30,665 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 5 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:45:30,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:45:30,695 INFO L225 Difference]: With dead ends: 30904 [2021-11-23 17:45:30,695 INFO L226 Difference]: Without dead ends: 27794 [2021-11-23 17:45:30,703 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 134 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 17:45:30,703 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 58 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 364 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 58 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:45:30,704 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 364 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 58 Unchecked, 0.0s Time] [2021-11-23 17:45:30,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27794 states. [2021-11-23 17:45:32,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27794 to 27792. [2021-11-23 17:45:32,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27792 states, 27791 states have (on average 1.232953114317585) internal successors, (34265), 27791 states have internal predecessors, (34265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:32,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27792 states to 27792 states and 34265 transitions. [2021-11-23 17:45:32,821 INFO L78 Accepts]: Start accepts. Automaton has 27792 states and 34265 transitions. Word has length 139 [2021-11-23 17:45:32,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:45:32,822 INFO L470 AbstractCegarLoop]: Abstraction has 27792 states and 34265 transitions. [2021-11-23 17:45:32,822 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 5 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:32,822 INFO L276 IsEmpty]: Start isEmpty. Operand 27792 states and 34265 transitions. [2021-11-23 17:45:32,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:45:32,827 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:45:32,827 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:45:32,837 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (124)] Forceful destruction successful, exit code 0 [2021-11-23 17:45:33,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:45:33,028 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:45:33,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:45:33,028 INFO L85 PathProgramCache]: Analyzing trace with hash -1879253509, now seen corresponding path program 1 times [2021-11-23 17:45:33,029 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:45:33,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1232783413] [2021-11-23 17:45:33,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:33,029 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:45:33,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:45:33,030 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:45:33,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (125)] Waiting until timeout for monitored process [2021-11-23 17:45:33,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:33,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:45:33,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:34,430 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 24 proven. 59 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:45:34,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:45:34,882 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 24 proven. 59 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:45:34,882 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:45:34,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1232783413] [2021-11-23 17:45:34,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1232783413] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:45:34,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2140554770] [2021-11-23 17:45:34,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:34,883 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:45:34,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:45:34,884 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:45:34,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (126)] Waiting until timeout for monitored process [2021-11-23 17:45:35,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:35,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:45:35,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:36,224 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 24 proven. 59 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:45:36,224 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:45:36,636 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 24 proven. 59 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:45:36,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2140554770] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:45:36,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118838106] [2021-11-23 17:45:36,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:36,636 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:45:36,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:45:36,637 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:45:36,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Waiting until timeout for monitored process [2021-11-23 17:45:36,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:36,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:45:36,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:38,045 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 24 proven. 59 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:45:38,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:45:38,436 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 24 proven. 59 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:45:38,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [118838106] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:45:38,437 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:45:38,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:45:38,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022012255] [2021-11-23 17:45:38,437 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:45:38,438 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:45:38,438 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:45:38,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:45:38,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:45:38,438 INFO L87 Difference]: Start difference. First operand 27792 states and 34265 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 17:45:41,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:45:41,276 INFO L93 Difference]: Finished difference Result 45304 states and 56067 transitions. [2021-11-23 17:45:41,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:45:41,276 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 139 [2021-11-23 17:45:41,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:45:41,319 INFO L225 Difference]: With dead ends: 45304 [2021-11-23 17:45:41,319 INFO L226 Difference]: Without dead ends: 41943 [2021-11-23 17:45:41,326 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 839 GetRequests, 817 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=113, Invalid=439, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:45:41,327 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 238 mSDsluCounter, 762 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 873 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 77 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:45:41,327 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [238 Valid, 873 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 35 Invalid, 0 Unknown, 77 Unchecked, 0.0s Time] [2021-11-23 17:45:41,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41943 states. [2021-11-23 17:45:44,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41943 to 41839. [2021-11-23 17:45:44,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41839 states, 41838 states have (on average 1.227472632535016) internal successors, (51355), 41838 states have internal predecessors, (51355), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:44,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41839 states to 41839 states and 51355 transitions. [2021-11-23 17:45:44,399 INFO L78 Accepts]: Start accepts. Automaton has 41839 states and 51355 transitions. Word has length 139 [2021-11-23 17:45:44,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:45:44,399 INFO L470 AbstractCegarLoop]: Abstraction has 41839 states and 51355 transitions. [2021-11-23 17:45:44,399 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 17:45:44,399 INFO L276 IsEmpty]: Start isEmpty. Operand 41839 states and 51355 transitions. [2021-11-23 17:45:44,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:45:44,407 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:45:44,407 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:45:44,416 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (125)] Forceful destruction successful, exit code 0 [2021-11-23 17:45:44,612 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (126)] Forceful destruction successful, exit code 0 [2021-11-23 17:45:44,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Forceful destruction successful, exit code 0 [2021-11-23 17:45:45,008 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:45:45,008 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:45:45,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:45:45,009 INFO L85 PathProgramCache]: Analyzing trace with hash -1362768309, now seen corresponding path program 1 times [2021-11-23 17:45:45,009 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:45:45,010 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [235700753] [2021-11-23 17:45:45,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:45,010 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:45:45,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:45:45,011 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:45:45,015 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (128)] Waiting until timeout for monitored process [2021-11-23 17:45:45,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:45,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:45:45,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:45,898 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 95 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 17:45:45,898 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:45:45,898 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:45:45,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [235700753] [2021-11-23 17:45:45,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [235700753] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:45:45,899 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:45:45,899 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:45:45,899 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683395223] [2021-11-23 17:45:45,899 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:45:45,899 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:45:45,900 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:45:45,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:45:45,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:45:45,900 INFO L87 Difference]: Start difference. First operand 41839 states and 51355 transitions. Second operand has 6 states, 6 states have (on average 21.333333333333332) internal successors, (128), 5 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:48,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:45:48,871 INFO L93 Difference]: Finished difference Result 43899 states and 53979 transitions. [2021-11-23 17:45:48,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:45:48,872 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.333333333333332) internal successors, (128), 5 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-23 17:45:48,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:45:48,919 INFO L225 Difference]: With dead ends: 43899 [2021-11-23 17:45:48,919 INFO L226 Difference]: Without dead ends: 41825 [2021-11-23 17:45:48,927 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 134 SyntacticMatches, 0 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 17:45:48,927 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 74 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:45:48,927 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 317 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2 Invalid, 0 Unknown, 47 Unchecked, 0.0s Time] [2021-11-23 17:45:48,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41825 states. [2021-11-23 17:45:52,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41825 to 41823. [2021-11-23 17:45:52,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41823 states, 41822 states have (on average 1.2206972406867198) internal successors, (51052), 41822 states have internal predecessors, (51052), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:52,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41823 states to 41823 states and 51052 transitions. [2021-11-23 17:45:52,558 INFO L78 Accepts]: Start accepts. Automaton has 41823 states and 51052 transitions. Word has length 139 [2021-11-23 17:45:52,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:45:52,558 INFO L470 AbstractCegarLoop]: Abstraction has 41823 states and 51052 transitions. [2021-11-23 17:45:52,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.333333333333332) internal successors, (128), 5 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:45:52,559 INFO L276 IsEmpty]: Start isEmpty. Operand 41823 states and 51052 transitions. [2021-11-23 17:45:52,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:45:52,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:45:52,565 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:45:52,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (128)] Forceful destruction successful, exit code 0 [2021-11-23 17:45:52,765 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:45:52,765 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:45:52,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:45:52,766 INFO L85 PathProgramCache]: Analyzing trace with hash 764330063, now seen corresponding path program 1 times [2021-11-23 17:45:52,766 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:45:52,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [65700981] [2021-11-23 17:45:52,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:52,766 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:45:52,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:45:52,767 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:45:52,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (129)] Waiting until timeout for monitored process [2021-11-23 17:45:52,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:52,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:45:52,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:55,440 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 43 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:45:55,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:45:55,931 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 43 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:45:55,932 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:45:55,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [65700981] [2021-11-23 17:45:55,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [65700981] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:45:55,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [602640149] [2021-11-23 17:45:55,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:45:55,933 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:45:55,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:45:55,933 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:45:55,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (130)] Waiting until timeout for monitored process [2021-11-23 17:45:56,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:45:56,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:45:56,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:45:59,752 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:45:59,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:46:02,175 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:46:02,175 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [602640149] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:46:02,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [665440226] [2021-11-23 17:46:02,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:46:02,176 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:46:02,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:46:02,176 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:46:02,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Waiting until timeout for monitored process [2021-11-23 17:46:02,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:46:02,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 17:46:02,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:46:06,326 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:46:06,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:46:07,502 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:46:07,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [665440226] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:46:07,502 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:46:07,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 23, 22, 22, 21] total 84 [2021-11-23 17:46:07,503 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804111350] [2021-11-23 17:46:07,503 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:46:07,504 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2021-11-23 17:46:07,504 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:46:07,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-11-23 17:46:07,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=6675, Unknown=0, NotChecked=0, Total=6972 [2021-11-23 17:46:07,505 INFO L87 Difference]: Start difference. First operand 41823 states and 51052 transitions. Second operand has 84 states, 84 states have (on average 7.380952380952381) internal successors, (620), 84 states have internal predecessors, (620), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:46:16,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:46:16,127 INFO L93 Difference]: Finished difference Result 64503 states and 79281 transitions. [2021-11-23 17:46:16,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-23 17:46:16,128 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 7.380952380952381) internal successors, (620), 84 states have internal predecessors, (620), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-23 17:46:16,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:46:16,208 INFO L225 Difference]: With dead ends: 64503 [2021-11-23 17:46:16,208 INFO L226 Difference]: Without dead ends: 63988 [2021-11-23 17:46:16,218 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 879 GetRequests, 765 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3877 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=663, Invalid=12677, Unknown=0, NotChecked=0, Total=13340 [2021-11-23 17:46:16,219 INFO L933 BasicCegarLoop]: 191 mSDtfsCounter, 298 mSDsluCounter, 8835 mSDsCounter, 0 mSdLazyCounter, 753 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 298 SdHoareTripleChecker+Valid, 9026 SdHoareTripleChecker+Invalid, 1623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 753 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 849 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:46:16,219 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [298 Valid, 9026 Invalid, 1623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 753 Invalid, 0 Unknown, 849 Unchecked, 0.6s Time] [2021-11-23 17:46:16,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63988 states. [2021-11-23 17:46:19,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63988 to 41767. [2021-11-23 17:46:19,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41767 states, 41766 states have (on average 1.220610065603601) internal successors, (50980), 41766 states have internal predecessors, (50980), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:46:19,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41767 states to 41767 states and 50980 transitions. [2021-11-23 17:46:19,736 INFO L78 Accepts]: Start accepts. Automaton has 41767 states and 50980 transitions. Word has length 140 [2021-11-23 17:46:19,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:46:19,736 INFO L470 AbstractCegarLoop]: Abstraction has 41767 states and 50980 transitions. [2021-11-23 17:46:19,737 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 7.380952380952381) internal successors, (620), 84 states have internal predecessors, (620), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:46:19,737 INFO L276 IsEmpty]: Start isEmpty. Operand 41767 states and 50980 transitions. [2021-11-23 17:46:19,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:46:19,743 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:46:19,744 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:46:19,768 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Forceful destruction successful, exit code 0 [2021-11-23 17:46:19,949 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (130)] Forceful destruction successful, exit code 0 [2021-11-23 17:46:20,152 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (129)] Forceful destruction successful, exit code 0 [2021-11-23 17:46:20,345 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:46:20,346 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:46:20,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:46:20,346 INFO L85 PathProgramCache]: Analyzing trace with hash -1879951761, now seen corresponding path program 1 times [2021-11-23 17:46:20,347 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:46:20,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [780440715] [2021-11-23 17:46:20,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:46:20,347 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:46:20,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:46:20,348 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:46:20,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (132)] Waiting until timeout for monitored process [2021-11-23 17:46:20,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:46:20,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:46:20,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:46:23,651 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 25 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:46:23,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:46:25,905 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 25 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:46:25,905 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:46:25,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [780440715] [2021-11-23 17:46:25,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [780440715] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:46:25,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [568208517] [2021-11-23 17:46:25,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:46:25,905 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:46:25,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:46:25,906 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:46:25,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (133)] Waiting until timeout for monitored process [2021-11-23 17:46:26,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:46:26,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:46:26,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:46:30,347 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:46:30,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:46:33,604 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:46:33,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [568208517] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:46:33,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1181956865] [2021-11-23 17:46:33,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:46:33,604 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:46:33,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:46:33,605 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:46:33,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Waiting until timeout for monitored process [2021-11-23 17:46:33,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:46:33,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 17:46:33,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:46:38,170 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:46:38,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:46:39,200 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:46:39,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1181956865] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:46:39,201 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:46:39,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23, 22, 22, 21] total 103 [2021-11-23 17:46:39,201 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48704417] [2021-11-23 17:46:39,201 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:46:39,202 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2021-11-23 17:46:39,202 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:46:39,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2021-11-23 17:46:39,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=392, Invalid=10114, Unknown=0, NotChecked=0, Total=10506 [2021-11-23 17:46:39,203 INFO L87 Difference]: Start difference. First operand 41767 states and 50980 transitions. Second operand has 103 states, 103 states have (on average 6.145631067961165) internal successors, (633), 103 states have internal predecessors, (633), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:46:49,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:46:49,663 INFO L93 Difference]: Finished difference Result 48224 states and 58448 transitions. [2021-11-23 17:46:49,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-23 17:46:49,663 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 6.145631067961165) internal successors, (633), 103 states have internal predecessors, (633), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-23 17:46:49,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:46:49,720 INFO L225 Difference]: With dead ends: 48224 [2021-11-23 17:46:49,720 INFO L226 Difference]: Without dead ends: 47659 [2021-11-23 17:46:49,730 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 892 GetRequests, 751 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5924 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=913, Invalid=19393, Unknown=0, NotChecked=0, Total=20306 [2021-11-23 17:46:49,730 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 399 mSDsluCounter, 5878 mSDsCounter, 0 mSdLazyCounter, 489 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 399 SdHoareTripleChecker+Valid, 6004 SdHoareTripleChecker+Invalid, 1131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 621 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:46:49,730 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [399 Valid, 6004 Invalid, 1131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 489 Invalid, 0 Unknown, 621 Unchecked, 0.5s Time] [2021-11-23 17:46:49,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47659 states. [2021-11-23 17:46:53,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47659 to 41779. [2021-11-23 17:46:53,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41779 states, 41778 states have (on average 1.2205945713054718) internal successors, (50994), 41778 states have internal predecessors, (50994), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:46:53,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41779 states to 41779 states and 50994 transitions. [2021-11-23 17:46:53,272 INFO L78 Accepts]: Start accepts. Automaton has 41779 states and 50994 transitions. Word has length 140 [2021-11-23 17:46:53,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:46:53,273 INFO L470 AbstractCegarLoop]: Abstraction has 41779 states and 50994 transitions. [2021-11-23 17:46:53,273 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 6.145631067961165) internal successors, (633), 103 states have internal predecessors, (633), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:46:53,273 INFO L276 IsEmpty]: Start isEmpty. Operand 41779 states and 50994 transitions. [2021-11-23 17:46:53,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:46:53,428 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:46:53,428 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:46:53,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (132)] Forceful destruction successful, exit code 0 [2021-11-23 17:46:53,657 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Ended with exit code 0 [2021-11-23 17:46:53,840 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (133)] Forceful destruction successful, exit code 0 [2021-11-23 17:46:54,038 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 132 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,134 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,133 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:46:54,039 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:46:54,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:46:54,039 INFO L85 PathProgramCache]: Analyzing trace with hash -949655950, now seen corresponding path program 1 times [2021-11-23 17:46:54,040 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:46:54,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [893495695] [2021-11-23 17:46:54,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:46:54,040 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:46:54,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:46:54,041 INFO L229 MonitoredProcess]: Starting monitored process 135 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:46:54,042 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (135)] Waiting until timeout for monitored process [2021-11-23 17:46:54,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:46:54,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:46:54,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:47:03,345 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 34 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:47:03,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:47:08,168 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:47:08,168 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:47:08,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [893495695] [2021-11-23 17:47:08,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [893495695] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:47:08,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [644465408] [2021-11-23 17:47:08,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:47:08,169 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:47:08,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:47:08,169 INFO L229 MonitoredProcess]: Starting monitored process 136 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:47:08,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (136)] Waiting until timeout for monitored process [2021-11-23 17:47:08,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:47:08,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:47:08,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:47:13,694 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 34 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:47:13,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:47:15,691 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:47:15,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [644465408] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:47:15,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2030982128] [2021-11-23 17:47:15,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:47:15,692 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:47:15,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:47:15,693 INFO L229 MonitoredProcess]: Starting monitored process 137 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:47:15,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d778df8-32cf-46e6-8d9d-2abab036fb88/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (137)] Waiting until timeout for monitored process [2021-11-23 17:47:15,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:47:15,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-23 17:47:15,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:47:25,885 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 76 proven. 8 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:47:25,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:47:40,382 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:47:40,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2030982128] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:47:40,382 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:47:40,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 25, 22, 21, 29, 39] total 144 [2021-11-23 17:47:40,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562670478] [2021-11-23 17:47:40,399 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:47:40,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 144 states [2021-11-23 17:47:40,401 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:47:40,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2021-11-23 17:47:40,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1909, Invalid=18683, Unknown=0, NotChecked=0, Total=20592 [2021-11-23 17:47:40,403 INFO L87 Difference]: Start difference. First operand 41779 states and 50994 transitions. Second operand has 144 states, 144 states have (on average 4.520833333333333) internal successors, (651), 144 states have internal predecessors, (651), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)