./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrlen-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 678e0110 Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrlen-alloca-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash a9da884533d6d47d95abcc742a22337ea753025b ......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- Skipped default analysis because property is memsafety ### Bit-precise run ### This is Ultimate 0.1.24-678e011 [2019-11-20 08:18:22,558 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-20 08:18:22,560 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-20 08:18:22,576 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-20 08:18:22,576 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-20 08:18:22,578 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-20 08:18:22,580 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-20 08:18:22,589 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-20 08:18:22,594 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-20 08:18:22,598 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-20 08:18:22,599 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-20 08:18:22,601 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-20 08:18:22,601 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-20 08:18:22,603 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-20 08:18:22,605 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-20 08:18:22,606 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-20 08:18:22,607 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-20 08:18:22,608 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-20 08:18:22,611 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-20 08:18:22,615 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-20 08:18:22,619 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-20 08:18:22,620 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-20 08:18:22,624 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-20 08:18:22,625 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-20 08:18:22,627 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-20 08:18:22,627 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-20 08:18:22,628 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-20 08:18:22,629 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-20 08:18:22,630 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-20 08:18:22,631 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-20 08:18:22,631 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-20 08:18:22,632 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-20 08:18:22,632 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-20 08:18:22,633 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-20 08:18:22,634 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-20 08:18:22,635 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-20 08:18:22,635 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-20 08:18:22,635 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-20 08:18:22,636 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-20 08:18:22,636 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-20 08:18:22,638 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-20 08:18:22,639 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2019-11-20 08:18:22,665 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-20 08:18:22,666 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-20 08:18:22,667 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-20 08:18:22,667 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-20 08:18:22,667 INFO L138 SettingsManager]: * Use SBE=true [2019-11-20 08:18:22,668 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-20 08:18:22,668 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-20 08:18:22,668 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2019-11-20 08:18:22,668 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-20 08:18:22,668 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-20 08:18:22,668 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-20 08:18:22,669 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2019-11-20 08:18:22,669 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2019-11-20 08:18:22,669 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2019-11-20 08:18:22,669 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-20 08:18:22,669 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2019-11-20 08:18:22,670 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2019-11-20 08:18:22,670 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-20 08:18:22,670 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-20 08:18:22,670 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-20 08:18:22,670 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-20 08:18:22,671 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-20 08:18:22,671 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-20 08:18:22,671 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-20 08:18:22,671 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-20 08:18:22,672 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-20 08:18:22,672 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2019-11-20 08:18:22,672 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --rewrite-divk --print-success --lang smt [2019-11-20 08:18:22,672 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-20 08:18:22,672 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer 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 valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer 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 -> a9da884533d6d47d95abcc742a22337ea753025b [2019-11-20 08:18:22,830 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-20 08:18:22,841 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-20 08:18:22,844 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-20 08:18:22,846 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-20 08:18:22,846 INFO L275 PluginConnector]: CDTParser initialized [2019-11-20 08:18:22,847 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/../../sv-benchmarks/c/array-memsafety/cstrlen-alloca-2.i [2019-11-20 08:18:22,907 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/data/1195bff53/0d9a61c3d9894f3b9b18f5c01fd21f02/FLAG6baa5d3ef [2019-11-20 08:18:23,314 INFO L306 CDTParser]: Found 1 translation units. [2019-11-20 08:18:23,314 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/sv-benchmarks/c/array-memsafety/cstrlen-alloca-2.i [2019-11-20 08:18:23,325 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/data/1195bff53/0d9a61c3d9894f3b9b18f5c01fd21f02/FLAG6baa5d3ef [2019-11-20 08:18:23,631 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/data/1195bff53/0d9a61c3d9894f3b9b18f5c01fd21f02 [2019-11-20 08:18:23,636 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-20 08:18:23,637 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-20 08:18:23,642 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-20 08:18:23,642 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-20 08:18:23,645 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-20 08:18:23,645 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:18:23" (1/1) ... [2019-11-20 08:18:23,648 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4c03189c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:18:23, skipping insertion in model container [2019-11-20 08:18:23,648 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:18:23" (1/1) ... [2019-11-20 08:18:23,654 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-20 08:18:23,688 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-20 08:18:24,034 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-20 08:18:24,046 INFO L188 MainTranslator]: Completed pre-run [2019-11-20 08:18:24,104 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-20 08:18:24,168 INFO L192 MainTranslator]: Completed translation [2019-11-20 08:18:24,168 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:18:24 WrapperNode [2019-11-20 08:18:24,168 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-20 08:18:24,169 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-20 08:18:24,169 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-20 08:18:24,169 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-20 08:18:24,181 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:18:24" (1/1) ... [2019-11-20 08:18:24,182 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:18:24" (1/1) ... [2019-11-20 08:18:24,196 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:18:24" (1/1) ... [2019-11-20 08:18:24,197 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:18:24" (1/1) ... [2019-11-20 08:18:24,212 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:18:24" (1/1) ... [2019-11-20 08:18:24,216 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:18:24" (1/1) ... [2019-11-20 08:18:24,219 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:18:24" (1/1) ... [2019-11-20 08:18:24,225 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-20 08:18:24,226 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-20 08:18:24,226 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-20 08:18:24,226 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-20 08:18:24,227 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:18:24" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-20 08:18:24,308 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-20 08:18:24,309 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-20 08:18:24,309 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2019-11-20 08:18:24,309 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2019-11-20 08:18:24,310 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2019-11-20 08:18:24,310 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2019-11-20 08:18:24,310 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2019-11-20 08:18:24,311 INFO L138 BoogieDeclarations]: Found implementation of procedure cstrlen [2019-11-20 08:18:24,311 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-20 08:18:24,312 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2019-11-20 08:18:24,312 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2019-11-20 08:18:24,312 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2019-11-20 08:18:24,312 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2019-11-20 08:18:24,313 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2019-11-20 08:18:24,313 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2019-11-20 08:18:24,313 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2019-11-20 08:18:24,314 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2019-11-20 08:18:24,314 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2019-11-20 08:18:24,314 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2019-11-20 08:18:24,314 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2019-11-20 08:18:24,314 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2019-11-20 08:18:24,314 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2019-11-20 08:18:24,315 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2019-11-20 08:18:24,315 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2019-11-20 08:18:24,315 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2019-11-20 08:18:24,316 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2019-11-20 08:18:24,316 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2019-11-20 08:18:24,316 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2019-11-20 08:18:24,316 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2019-11-20 08:18:24,316 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2019-11-20 08:18:24,316 INFO L130 BoogieDeclarations]: Found specification of procedure select [2019-11-20 08:18:24,317 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2019-11-20 08:18:24,317 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2019-11-20 08:18:24,317 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2019-11-20 08:18:24,317 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2019-11-20 08:18:24,317 INFO L130 BoogieDeclarations]: Found specification of procedure random [2019-11-20 08:18:24,317 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2019-11-20 08:18:24,317 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2019-11-20 08:18:24,318 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2019-11-20 08:18:24,318 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2019-11-20 08:18:24,318 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2019-11-20 08:18:24,318 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2019-11-20 08:18:24,318 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2019-11-20 08:18:24,318 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2019-11-20 08:18:24,319 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2019-11-20 08:18:24,320 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2019-11-20 08:18:24,320 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2019-11-20 08:18:24,320 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2019-11-20 08:18:24,320 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2019-11-20 08:18:24,320 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2019-11-20 08:18:24,320 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2019-11-20 08:18:24,321 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2019-11-20 08:18:24,321 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2019-11-20 08:18:24,321 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2019-11-20 08:18:24,321 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2019-11-20 08:18:24,321 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2019-11-20 08:18:24,321 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2019-11-20 08:18:24,321 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2019-11-20 08:18:24,321 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2019-11-20 08:18:24,322 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2019-11-20 08:18:24,322 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2019-11-20 08:18:24,322 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2019-11-20 08:18:24,322 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2019-11-20 08:18:24,322 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2019-11-20 08:18:24,322 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-11-20 08:18:24,323 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2019-11-20 08:18:24,323 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2019-11-20 08:18:24,324 INFO L130 BoogieDeclarations]: Found specification of procedure free [2019-11-20 08:18:24,324 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2019-11-20 08:18:24,324 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2019-11-20 08:18:24,324 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2019-11-20 08:18:24,325 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2019-11-20 08:18:24,325 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2019-11-20 08:18:24,325 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2019-11-20 08:18:24,326 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2019-11-20 08:18:24,326 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2019-11-20 08:18:24,327 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-20 08:18:24,327 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2019-11-20 08:18:24,327 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2019-11-20 08:18:24,327 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2019-11-20 08:18:24,327 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2019-11-20 08:18:24,327 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2019-11-20 08:18:24,327 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2019-11-20 08:18:24,327 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2019-11-20 08:18:24,328 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2019-11-20 08:18:24,328 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2019-11-20 08:18:24,328 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2019-11-20 08:18:24,328 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2019-11-20 08:18:24,328 INFO L130 BoogieDeclarations]: Found specification of procedure system [2019-11-20 08:18:24,328 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2019-11-20 08:18:24,328 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2019-11-20 08:18:24,328 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2019-11-20 08:18:24,329 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2019-11-20 08:18:24,329 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2019-11-20 08:18:24,329 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2019-11-20 08:18:24,329 INFO L130 BoogieDeclarations]: Found specification of procedure div [2019-11-20 08:18:24,329 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2019-11-20 08:18:24,329 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2019-11-20 08:18:24,329 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2019-11-20 08:18:24,329 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2019-11-20 08:18:24,330 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2019-11-20 08:18:24,330 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2019-11-20 08:18:24,330 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2019-11-20 08:18:24,330 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2019-11-20 08:18:24,330 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2019-11-20 08:18:24,330 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2019-11-20 08:18:24,330 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2019-11-20 08:18:24,330 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2019-11-20 08:18:24,331 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2019-11-20 08:18:24,331 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2019-11-20 08:18:24,331 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2019-11-20 08:18:24,331 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2019-11-20 08:18:24,331 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2019-11-20 08:18:24,331 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2019-11-20 08:18:24,331 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2019-11-20 08:18:24,332 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2019-11-20 08:18:24,332 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-20 08:18:24,332 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2019-11-20 08:18:24,333 INFO L130 BoogieDeclarations]: Found specification of procedure cstrlen [2019-11-20 08:18:24,333 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2019-11-20 08:18:24,333 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-20 08:18:24,333 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-20 08:18:24,333 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2019-11-20 08:18:24,333 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-20 08:18:24,334 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-20 08:18:24,334 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-20 08:18:25,040 INFO L280 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-20 08:18:25,040 INFO L285 CfgBuilder]: Removed 2 assume(true) statements. [2019-11-20 08:18:25,041 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 08:18:25 BoogieIcfgContainer [2019-11-20 08:18:25,041 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-20 08:18:25,043 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-20 08:18:25,043 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-20 08:18:25,046 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-20 08:18:25,046 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 08:18:23" (1/3) ... [2019-11-20 08:18:25,047 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@567679b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 08:18:25, skipping insertion in model container [2019-11-20 08:18:25,047 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:18:24" (2/3) ... [2019-11-20 08:18:25,048 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@567679b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 08:18:25, skipping insertion in model container [2019-11-20 08:18:25,048 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 08:18:25" (3/3) ... [2019-11-20 08:18:25,050 INFO L109 eAbstractionObserver]: Analyzing ICFG cstrlen-alloca-2.i [2019-11-20 08:18:25,059 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-20 08:18:25,066 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 7 error locations. [2019-11-20 08:18:25,078 INFO L249 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2019-11-20 08:18:25,098 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-20 08:18:25,098 INFO L374 AbstractCegarLoop]: Hoare is false [2019-11-20 08:18:25,098 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-20 08:18:25,098 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-20 08:18:25,098 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-20 08:18:25,099 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-20 08:18:25,099 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-20 08:18:25,099 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-20 08:18:25,113 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states. [2019-11-20 08:18:25,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-20 08:18:25,123 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 08:18:25,123 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 08:18:25,124 INFO L410 AbstractCegarLoop]: === Iteration 1 === [cstrlenErr1REQUIRES_VIOLATION, cstrlenErr0REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-20 08:18:25,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 08:18:25,129 INFO L82 PathProgramCache]: Analyzing trace with hash 1480341813, now seen corresponding path program 1 times [2019-11-20 08:18:25,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 08:18:25,140 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1466798579] [2019-11-20 08:18:25,141 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/cvc4 Starting monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:25,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 08:18:25,382 INFO L255 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-20 08:18:25,387 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 08:18:25,453 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-20 08:18:25,454 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:18:25,464 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:25,464 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:25,464 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-20 08:18:25,479 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:25,479 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 08:18:25,497 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:25,499 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1466798579] [2019-11-20 08:18:25,499 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 08:18:25,500 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2019-11-20 08:18:25,500 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836347000] [2019-11-20 08:18:25,505 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-20 08:18:25,506 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 08:18:25,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-20 08:18:25,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-20 08:18:25,525 INFO L87 Difference]: Start difference. First operand 32 states. Second operand 3 states. [2019-11-20 08:18:25,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 08:18:25,613 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2019-11-20 08:18:25,615 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-20 08:18:25,616 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-11-20 08:18:25,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 08:18:25,627 INFO L225 Difference]: With dead ends: 30 [2019-11-20 08:18:25,628 INFO L226 Difference]: Without dead ends: 27 [2019-11-20 08:18:25,632 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-20 08:18:25,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-11-20 08:18:25,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2019-11-20 08:18:25,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-20 08:18:25,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2019-11-20 08:18:25,664 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 10 [2019-11-20 08:18:25,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 08:18:25,664 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2019-11-20 08:18:25,664 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-20 08:18:25,664 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2019-11-20 08:18:25,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-20 08:18:25,665 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 08:18:25,665 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 08:18:25,867 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:25,867 INFO L410 AbstractCegarLoop]: === Iteration 2 === [cstrlenErr1REQUIRES_VIOLATION, cstrlenErr0REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-20 08:18:25,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 08:18:25,868 INFO L82 PathProgramCache]: Analyzing trace with hash 1480341814, now seen corresponding path program 1 times [2019-11-20 08:18:25,868 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 08:18:25,869 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [100847233] [2019-11-20 08:18:25,869 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/cvc4 Starting monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:26,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 08:18:26,044 INFO L255 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-20 08:18:26,045 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 08:18:26,069 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-20 08:18:26,069 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:18:26,081 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:26,082 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:26,082 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:14 [2019-11-20 08:18:26,099 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:26,100 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 08:18:26,262 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:26,262 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [100847233] [2019-11-20 08:18:26,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 08:18:26,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2019-11-20 08:18:26,262 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356731900] [2019-11-20 08:18:26,264 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-20 08:18:26,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 08:18:26,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-20 08:18:26,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-20 08:18:26,265 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 6 states. [2019-11-20 08:18:26,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 08:18:26,562 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2019-11-20 08:18:26,563 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-20 08:18:26,563 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2019-11-20 08:18:26,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 08:18:26,565 INFO L225 Difference]: With dead ends: 37 [2019-11-20 08:18:26,565 INFO L226 Difference]: Without dead ends: 37 [2019-11-20 08:18:26,566 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2019-11-20 08:18:26,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-20 08:18:26,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 26. [2019-11-20 08:18:26,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-20 08:18:26,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2019-11-20 08:18:26,575 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 10 [2019-11-20 08:18:26,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 08:18:26,575 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2019-11-20 08:18:26,575 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-20 08:18:26,576 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2019-11-20 08:18:26,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-20 08:18:26,576 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 08:18:26,577 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 08:18:26,786 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:26,787 INFO L410 AbstractCegarLoop]: === Iteration 3 === [cstrlenErr1REQUIRES_VIOLATION, cstrlenErr0REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-20 08:18:26,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 08:18:26,787 INFO L82 PathProgramCache]: Analyzing trace with hash 1480341867, now seen corresponding path program 1 times [2019-11-20 08:18:26,787 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 08:18:26,788 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [533019506] [2019-11-20 08:18:26,788 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/cvc4 Starting monitored process 4 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:26,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 08:18:26,967 INFO L255 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-20 08:18:26,968 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 08:18:26,996 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:26,997 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 08:18:27,034 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:27,034 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [533019506] [2019-11-20 08:18:27,035 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 08:18:27,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2019-11-20 08:18:27,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043827781] [2019-11-20 08:18:27,036 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-20 08:18:27,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 08:18:27,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-20 08:18:27,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-20 08:18:27,036 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 6 states. [2019-11-20 08:18:27,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 08:18:27,137 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2019-11-20 08:18:27,145 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-20 08:18:27,146 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2019-11-20 08:18:27,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 08:18:27,147 INFO L225 Difference]: With dead ends: 33 [2019-11-20 08:18:27,147 INFO L226 Difference]: Without dead ends: 33 [2019-11-20 08:18:27,147 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-20 08:18:27,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-11-20 08:18:27,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 28. [2019-11-20 08:18:27,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-20 08:18:27,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-11-20 08:18:27,153 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 10 [2019-11-20 08:18:27,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 08:18:27,153 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-11-20 08:18:27,153 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-20 08:18:27,153 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-11-20 08:18:27,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-20 08:18:27,159 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 08:18:27,159 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 08:18:27,360 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:27,360 INFO L410 AbstractCegarLoop]: === Iteration 4 === [cstrlenErr1REQUIRES_VIOLATION, cstrlenErr0REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-20 08:18:27,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 08:18:27,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1480401449, now seen corresponding path program 1 times [2019-11-20 08:18:27,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 08:18:27,361 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1007021406] [2019-11-20 08:18:27,361 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/cvc4 Starting monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:27,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 08:18:27,546 INFO L255 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-20 08:18:27,547 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 08:18:27,569 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-20 08:18:27,570 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:18:27,590 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:27,590 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:27,591 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:17, output treesize:13 [2019-11-20 08:18:27,612 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:27,612 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 08:18:27,710 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:27,711 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1007021406] [2019-11-20 08:18:27,711 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 08:18:27,711 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2019-11-20 08:18:27,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178131867] [2019-11-20 08:18:27,712 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-20 08:18:27,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 08:18:27,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-20 08:18:27,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-20 08:18:27,713 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 5 states. [2019-11-20 08:18:28,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 08:18:28,007 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2019-11-20 08:18:28,007 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-20 08:18:28,007 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2019-11-20 08:18:28,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 08:18:28,008 INFO L225 Difference]: With dead ends: 37 [2019-11-20 08:18:28,009 INFO L226 Difference]: Without dead ends: 37 [2019-11-20 08:18:28,009 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2019-11-20 08:18:28,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-20 08:18:28,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2019-11-20 08:18:28,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-20 08:18:28,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2019-11-20 08:18:28,014 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 10 [2019-11-20 08:18:28,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 08:18:28,015 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2019-11-20 08:18:28,015 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-20 08:18:28,015 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2019-11-20 08:18:28,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-20 08:18:28,015 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 08:18:28,015 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 08:18:28,216 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:28,216 INFO L410 AbstractCegarLoop]: === Iteration 5 === [cstrlenErr1REQUIRES_VIOLATION, cstrlenErr0REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-20 08:18:28,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 08:18:28,217 INFO L82 PathProgramCache]: Analyzing trace with hash 138789715, now seen corresponding path program 1 times [2019-11-20 08:18:28,217 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 08:18:28,218 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1049763857] [2019-11-20 08:18:28,218 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/cvc4 Starting monitored process 6 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:28,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 08:18:28,372 INFO L255 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-20 08:18:28,373 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 08:18:28,378 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-20 08:18:28,378 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:18:28,381 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:28,381 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:28,381 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-20 08:18:28,403 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:28,403 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 08:18:28,410 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:28,411 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1049763857] [2019-11-20 08:18:28,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 08:18:28,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2019-11-20 08:18:28,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042437785] [2019-11-20 08:18:28,412 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-20 08:18:28,412 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 08:18:28,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-20 08:18:28,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-20 08:18:28,413 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 5 states. [2019-11-20 08:18:28,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 08:18:28,522 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2019-11-20 08:18:28,523 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-20 08:18:28,523 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2019-11-20 08:18:28,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 08:18:28,524 INFO L225 Difference]: With dead ends: 29 [2019-11-20 08:18:28,525 INFO L226 Difference]: Without dead ends: 29 [2019-11-20 08:18:28,525 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-20 08:18:28,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-20 08:18:28,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-11-20 08:18:28,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-20 08:18:28,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2019-11-20 08:18:28,529 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 13 [2019-11-20 08:18:28,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 08:18:28,530 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2019-11-20 08:18:28,530 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-20 08:18:28,531 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2019-11-20 08:18:28,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-20 08:18:28,531 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 08:18:28,532 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 08:18:28,732 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:28,733 INFO L410 AbstractCegarLoop]: === Iteration 6 === [cstrlenErr1REQUIRES_VIOLATION, cstrlenErr0REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-20 08:18:28,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 08:18:28,733 INFO L82 PathProgramCache]: Analyzing trace with hash 138789716, now seen corresponding path program 1 times [2019-11-20 08:18:28,733 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 08:18:28,733 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1216674318] [2019-11-20 08:18:28,733 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/cvc4 Starting monitored process 7 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:28,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 08:18:28,910 INFO L255 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-20 08:18:28,911 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 08:18:28,924 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-20 08:18:28,924 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:18:28,932 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:28,932 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:28,933 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2019-11-20 08:18:28,993 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:28,993 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 08:18:29,272 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:29,273 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1216674318] [2019-11-20 08:18:29,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 08:18:29,273 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 9 [2019-11-20 08:18:29,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082937279] [2019-11-20 08:18:29,274 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-20 08:18:29,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 08:18:29,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-20 08:18:29,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2019-11-20 08:18:29,275 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 10 states. [2019-11-20 08:18:29,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 08:18:29,768 INFO L93 Difference]: Finished difference Result 47 states and 51 transitions. [2019-11-20 08:18:29,768 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-20 08:18:29,768 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2019-11-20 08:18:29,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 08:18:29,771 INFO L225 Difference]: With dead ends: 47 [2019-11-20 08:18:29,771 INFO L226 Difference]: Without dead ends: 47 [2019-11-20 08:18:29,772 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2019-11-20 08:18:29,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-11-20 08:18:29,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 30. [2019-11-20 08:18:29,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-20 08:18:29,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2019-11-20 08:18:29,777 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 13 [2019-11-20 08:18:29,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 08:18:29,777 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2019-11-20 08:18:29,777 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-20 08:18:29,777 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2019-11-20 08:18:29,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-20 08:18:29,778 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 08:18:29,779 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 08:18:29,981 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:29,982 INFO L410 AbstractCegarLoop]: === Iteration 7 === [cstrlenErr1REQUIRES_VIOLATION, cstrlenErr0REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-20 08:18:29,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 08:18:29,982 INFO L82 PathProgramCache]: Analyzing trace with hash 232930637, now seen corresponding path program 1 times [2019-11-20 08:18:29,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 08:18:29,982 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [2074881393] [2019-11-20 08:18:29,983 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/cvc4 Starting monitored process 8 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:30,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 08:18:30,159 INFO L255 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-20 08:18:30,161 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 08:18:30,182 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 8 [2019-11-20 08:18:30,182 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:18:30,188 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:30,188 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:30,189 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:16, output treesize:12 [2019-11-20 08:18:30,243 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2019-11-20 08:18:30,244 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:18:30,250 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:30,251 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:30,251 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:17, output treesize:5 [2019-11-20 08:18:30,261 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:30,261 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 08:18:30,330 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 15 [2019-11-20 08:18:30,337 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 21 [2019-11-20 08:18:30,339 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-11-20 08:18:30,340 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:30,340 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:30,342 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:30,342 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:30,343 INFO L221 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:17, output treesize:6 [2019-11-20 08:18:30,355 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:30,356 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2074881393] [2019-11-20 08:18:30,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 08:18:30,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 7] imperfect sequences [] total 11 [2019-11-20 08:18:30,356 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143854286] [2019-11-20 08:18:30,356 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-20 08:18:30,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 08:18:30,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-20 08:18:30,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2019-11-20 08:18:30,357 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 11 states. [2019-11-20 08:18:30,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 08:18:30,530 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2019-11-20 08:18:30,532 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-20 08:18:30,532 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 15 [2019-11-20 08:18:30,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 08:18:30,533 INFO L225 Difference]: With dead ends: 41 [2019-11-20 08:18:30,533 INFO L226 Difference]: Without dead ends: 41 [2019-11-20 08:18:30,533 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2019-11-20 08:18:30,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-11-20 08:18:30,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2019-11-20 08:18:30,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-11-20 08:18:30,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2019-11-20 08:18:30,538 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 15 [2019-11-20 08:18:30,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 08:18:30,539 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2019-11-20 08:18:30,539 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-20 08:18:30,539 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2019-11-20 08:18:30,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-20 08:18:30,540 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 08:18:30,540 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 08:18:30,741 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:30,741 INFO L410 AbstractCegarLoop]: === Iteration 8 === [cstrlenErr1REQUIRES_VIOLATION, cstrlenErr0REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-20 08:18:30,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 08:18:30,741 INFO L82 PathProgramCache]: Analyzing trace with hash 912989007, now seen corresponding path program 1 times [2019-11-20 08:18:30,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 08:18:30,742 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1677650804] [2019-11-20 08:18:30,742 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/cvc4 Starting monitored process 9 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:30,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 08:18:30,891 INFO L255 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-20 08:18:30,893 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 08:18:30,907 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-20 08:18:30,908 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:18:30,919 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:30,920 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:30,920 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:14, output treesize:13 [2019-11-20 08:18:30,951 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2019-11-20 08:18:30,951 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:18:30,988 INFO L567 ElimStorePlain]: treesize reduction 20, result has 53.5 percent of original size [2019-11-20 08:18:30,989 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:30,989 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:47, output treesize:23 [2019-11-20 08:18:31,109 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:31,109 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 22 [2019-11-20 08:18:31,110 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:18:31,113 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:18:31,114 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-20 08:18:31,131 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:31,132 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:18:31,133 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-20 08:18:31,133 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:31, output treesize:28 [2019-11-20 08:18:31,133 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:18:31,185 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:18:31,263 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:31,263 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 08:18:31,867 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 38 [2019-11-20 08:18:31,904 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2019-11-20 08:18:31,907 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2019-11-20 08:18:31,986 INFO L567 ElimStorePlain]: treesize reduction 7, result has 81.1 percent of original size [2019-11-20 08:18:31,987 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:32,012 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 38 [2019-11-20 08:18:32,050 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2019-11-20 08:18:32,054 INFO L496 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2019-11-20 08:18:32,151 INFO L567 ElimStorePlain]: treesize reduction 7, result has 81.1 percent of original size [2019-11-20 08:18:32,152 INFO L496 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:32,163 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 36 [2019-11-20 08:18:32,170 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-20 08:18:32,177 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-20 08:18:32,187 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2019-11-20 08:18:32,188 INFO L496 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2019-11-20 08:18:32,206 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:32,206 INFO L496 ElimStorePlain]: Start of recursive call 6: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:32,306 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:32,306 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 3 xjuncts. [2019-11-20 08:18:32,306 INFO L221 ElimStorePlain]: Needed 7 recursive calls to eliminate 1 variables, input treesize:119, output treesize:83 [2019-11-20 08:18:32,540 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:32,540 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1677650804] [2019-11-20 08:18:32,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 08:18:32,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 14 [2019-11-20 08:18:32,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569032165] [2019-11-20 08:18:32,541 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-20 08:18:32,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 08:18:32,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-20 08:18:32,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2019-11-20 08:18:32,542 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand 15 states. [2019-11-20 08:18:32,804 WARN L191 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2019-11-20 08:18:33,236 WARN L191 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2019-11-20 08:18:40,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 08:18:40,050 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2019-11-20 08:18:40,074 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-20 08:18:40,074 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 15 [2019-11-20 08:18:40,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 08:18:40,075 INFO L225 Difference]: With dead ends: 48 [2019-11-20 08:18:40,075 INFO L226 Difference]: Without dead ends: 48 [2019-11-20 08:18:40,076 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2019-11-20 08:18:40,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-11-20 08:18:40,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 42. [2019-11-20 08:18:40,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-11-20 08:18:40,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2019-11-20 08:18:40,081 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 15 [2019-11-20 08:18:40,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 08:18:40,082 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2019-11-20 08:18:40,082 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-20 08:18:40,082 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2019-11-20 08:18:40,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-20 08:18:40,083 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 08:18:40,083 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 08:18:40,283 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:40,284 INFO L410 AbstractCegarLoop]: === Iteration 9 === [cstrlenErr1REQUIRES_VIOLATION, cstrlenErr0REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-20 08:18:40,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 08:18:40,284 INFO L82 PathProgramCache]: Analyzing trace with hash -754029460, now seen corresponding path program 1 times [2019-11-20 08:18:40,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 08:18:40,284 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1992278813] [2019-11-20 08:18:40,285 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/cvc4 Starting monitored process 10 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:40,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 08:18:40,455 INFO L255 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-20 08:18:40,456 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 08:18:40,472 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-20 08:18:40,472 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:18:40,484 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:40,484 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:40,484 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:16 [2019-11-20 08:18:40,586 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:40,586 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 08:18:41,127 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:41,127 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1992278813] [2019-11-20 08:18:41,127 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 08:18:41,127 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 9 [2019-11-20 08:18:41,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722494392] [2019-11-20 08:18:41,128 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-20 08:18:41,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 08:18:41,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-20 08:18:41,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2019-11-20 08:18:41,129 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 10 states. [2019-11-20 08:18:42,008 WARN L191 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 26 [2019-11-20 08:18:42,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 08:18:42,350 INFO L93 Difference]: Finished difference Result 65 states and 72 transitions. [2019-11-20 08:18:42,352 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-20 08:18:42,352 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 14 [2019-11-20 08:18:42,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 08:18:42,354 INFO L225 Difference]: With dead ends: 65 [2019-11-20 08:18:42,354 INFO L226 Difference]: Without dead ends: 65 [2019-11-20 08:18:42,354 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2019-11-20 08:18:42,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2019-11-20 08:18:42,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 50. [2019-11-20 08:18:42,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-11-20 08:18:42,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 57 transitions. [2019-11-20 08:18:42,360 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 57 transitions. Word has length 14 [2019-11-20 08:18:42,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 08:18:42,360 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 57 transitions. [2019-11-20 08:18:42,360 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-20 08:18:42,360 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 57 transitions. [2019-11-20 08:18:42,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-20 08:18:42,361 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 08:18:42,361 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 08:18:42,566 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:42,566 INFO L410 AbstractCegarLoop]: === Iteration 10 === [cstrlenErr1REQUIRES_VIOLATION, cstrlenErr0REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-20 08:18:42,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 08:18:42,566 INFO L82 PathProgramCache]: Analyzing trace with hash -1444358493, now seen corresponding path program 1 times [2019-11-20 08:18:42,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 08:18:42,567 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [862699852] [2019-11-20 08:18:42,567 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/cvc4 Starting monitored process 11 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:42,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 08:18:42,716 INFO L255 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-20 08:18:42,717 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 08:18:42,723 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-20 08:18:42,724 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:18:42,725 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:42,726 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:42,726 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-20 08:18:42,770 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:42,770 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 39 [2019-11-20 08:18:42,771 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:18:42,785 INFO L567 ElimStorePlain]: treesize reduction 10, result has 60.0 percent of original size [2019-11-20 08:18:42,785 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:18:42,786 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-20 08:18:42,786 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:17, output treesize:15 [2019-11-20 08:18:42,787 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:18:42,796 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:18:42,809 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:18:42,823 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:18:42,840 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:18:42,851 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:18:42,868 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:18:42,891 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:42,891 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 08:18:44,961 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:44,961 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [862699852] [2019-11-20 08:18:44,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 08:18:44,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 8 [2019-11-20 08:18:44,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463383058] [2019-11-20 08:18:44,962 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-20 08:18:44,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 08:18:44,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-20 08:18:44,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=50, Unknown=1, NotChecked=0, Total=72 [2019-11-20 08:18:44,963 INFO L87 Difference]: Start difference. First operand 50 states and 57 transitions. Second operand 9 states. [2019-11-20 08:18:45,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 08:18:45,102 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2019-11-20 08:18:45,103 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-20 08:18:45,103 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2019-11-20 08:18:45,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 08:18:45,104 INFO L225 Difference]: With dead ends: 49 [2019-11-20 08:18:45,104 INFO L226 Difference]: Without dead ends: 34 [2019-11-20 08:18:45,105 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 24 SyntacticMatches, 7 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=34, Invalid=75, Unknown=1, NotChecked=0, Total=110 [2019-11-20 08:18:45,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-20 08:18:45,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2019-11-20 08:18:45,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-20 08:18:45,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2019-11-20 08:18:45,108 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 19 [2019-11-20 08:18:45,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 08:18:45,108 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2019-11-20 08:18:45,108 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-20 08:18:45,109 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2019-11-20 08:18:45,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-20 08:18:45,109 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 08:18:45,109 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 08:18:45,312 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:45,313 INFO L410 AbstractCegarLoop]: === Iteration 11 === [cstrlenErr1REQUIRES_VIOLATION, cstrlenErr0REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-20 08:18:45,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 08:18:45,313 INFO L82 PathProgramCache]: Analyzing trace with hash -1984233599, now seen corresponding path program 2 times [2019-11-20 08:18:45,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 08:18:45,313 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [64774518] [2019-11-20 08:18:45,313 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/cvc4 Starting monitored process 12 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:45,508 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-20 08:18:45,508 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-20 08:18:45,510 INFO L255 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-20 08:18:45,512 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 08:18:45,532 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-20 08:18:45,532 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:18:45,550 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:45,550 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:45,550 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:16 [2019-11-20 08:18:45,721 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-20 08:18:45,721 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 08:18:46,878 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:18:46,879 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [64774518] [2019-11-20 08:18:46,879 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 08:18:46,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 16 [2019-11-20 08:18:46,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437621859] [2019-11-20 08:18:46,879 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-20 08:18:46,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 08:18:46,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-20 08:18:46,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2019-11-20 08:18:46,880 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 16 states. [2019-11-20 08:18:48,106 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2019-11-20 08:18:48,585 WARN L191 SmtUtils]: Spent 293.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-11-20 08:18:48,859 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2019-11-20 08:18:49,305 WARN L191 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 38 [2019-11-20 08:18:49,955 WARN L191 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 32 [2019-11-20 08:18:50,328 WARN L191 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2019-11-20 08:18:50,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 08:18:50,485 INFO L93 Difference]: Finished difference Result 53 states and 56 transitions. [2019-11-20 08:18:50,486 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-20 08:18:50,486 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 19 [2019-11-20 08:18:50,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 08:18:50,487 INFO L225 Difference]: With dead ends: 53 [2019-11-20 08:18:50,487 INFO L226 Difference]: Without dead ends: 47 [2019-11-20 08:18:50,488 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=124, Invalid=632, Unknown=0, NotChecked=0, Total=756 [2019-11-20 08:18:50,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-11-20 08:18:50,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 39. [2019-11-20 08:18:50,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-11-20 08:18:50,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2019-11-20 08:18:50,491 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 19 [2019-11-20 08:18:50,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 08:18:50,492 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2019-11-20 08:18:50,492 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-20 08:18:50,495 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2019-11-20 08:18:50,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-20 08:18:50,495 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 08:18:50,495 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 08:18:50,696 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:50,696 INFO L410 AbstractCegarLoop]: === Iteration 12 === [cstrlenErr1REQUIRES_VIOLATION, cstrlenErr0REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-20 08:18:50,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 08:18:50,696 INFO L82 PathProgramCache]: Analyzing trace with hash 1135293554, now seen corresponding path program 2 times [2019-11-20 08:18:50,697 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 08:18:50,697 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1791361027] [2019-11-20 08:18:50,697 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/cvc4 Starting monitored process 13 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:18:50,862 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-20 08:18:50,862 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-20 08:18:50,863 INFO L255 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-20 08:18:50,865 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 08:18:50,885 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-20 08:18:50,885 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:18:50,894 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:18:50,895 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:18:50,895 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:14, output treesize:13 [2019-11-20 08:18:51,103 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-20 08:18:51,103 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 08:18:52,535 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-11-20 08:18:56,467 WARN L191 SmtUtils]: Spent 2.99 s on a formula simplification that was a NOOP. DAG size: 31 [2019-11-20 08:19:06,019 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-20 08:19:06,020 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1791361027] [2019-11-20 08:19:06,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 08:19:06,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 13 [2019-11-20 08:19:06,020 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433982083] [2019-11-20 08:19:06,020 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-20 08:19:06,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 08:19:06,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-20 08:19:06,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=125, Unknown=0, NotChecked=0, Total=182 [2019-11-20 08:19:06,021 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 14 states. [2019-11-20 08:19:06,689 WARN L191 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 16 [2019-11-20 08:19:07,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 08:19:07,200 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2019-11-20 08:19:07,202 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-20 08:19:07,202 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 22 [2019-11-20 08:19:07,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 08:19:07,202 INFO L225 Difference]: With dead ends: 38 [2019-11-20 08:19:07,203 INFO L226 Difference]: Without dead ends: 38 [2019-11-20 08:19:07,203 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 23 SyntacticMatches, 8 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2019-11-20 08:19:07,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-11-20 08:19:07,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 33. [2019-11-20 08:19:07,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-20 08:19:07,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2019-11-20 08:19:07,205 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 22 [2019-11-20 08:19:07,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 08:19:07,205 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2019-11-20 08:19:07,205 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-20 08:19:07,205 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2019-11-20 08:19:07,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-20 08:19:07,206 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 08:19:07,206 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 08:19:07,409 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:19:07,409 INFO L410 AbstractCegarLoop]: === Iteration 13 === [cstrlenErr1REQUIRES_VIOLATION, cstrlenErr0REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-20 08:19:07,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 08:19:07,409 INFO L82 PathProgramCache]: Analyzing trace with hash -1395400681, now seen corresponding path program 1 times [2019-11-20 08:19:07,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 08:19:07,409 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1125676303] [2019-11-20 08:19:07,410 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/cvc4 Starting monitored process 14 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:19:07,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 08:19:07,593 INFO L255 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-20 08:19:07,606 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 08:19:07,612 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-20 08:19:07,613 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:19:07,620 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:19:07,621 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:19:07,621 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2019-11-20 08:19:07,888 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-20 08:19:07,888 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 08:19:08,484 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-20 08:19:08,484 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1125676303] [2019-11-20 08:19:08,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 08:19:08,485 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2019-11-20 08:19:08,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710199035] [2019-11-20 08:19:08,485 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-20 08:19:08,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 08:19:08,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-20 08:19:08,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2019-11-20 08:19:08,486 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 18 states. [2019-11-20 08:19:09,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 08:19:09,191 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2019-11-20 08:19:09,192 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-20 08:19:09,192 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2019-11-20 08:19:09,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 08:19:09,193 INFO L225 Difference]: With dead ends: 39 [2019-11-20 08:19:09,193 INFO L226 Difference]: Without dead ends: 31 [2019-11-20 08:19:09,194 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=85, Invalid=377, Unknown=0, NotChecked=0, Total=462 [2019-11-20 08:19:09,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-20 08:19:09,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2019-11-20 08:19:09,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-20 08:19:09,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2019-11-20 08:19:09,196 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 25 [2019-11-20 08:19:09,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 08:19:09,197 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2019-11-20 08:19:09,197 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-20 08:19:09,197 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2019-11-20 08:19:09,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-20 08:19:09,198 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 08:19:09,198 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 08:19:09,398 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:19:09,399 INFO L410 AbstractCegarLoop]: === Iteration 14 === [cstrlenErr1REQUIRES_VIOLATION, cstrlenErr0REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-20 08:19:09,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 08:19:09,399 INFO L82 PathProgramCache]: Analyzing trace with hash 1847085883, now seen corresponding path program 2 times [2019-11-20 08:19:09,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 08:19:09,400 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1979246597] [2019-11-20 08:19:09,400 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/cvc4 Starting monitored process 15 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:19:09,624 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-20 08:19:09,624 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-20 08:19:09,626 INFO L255 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 25 conjunts are in the unsatisfiable core [2019-11-20 08:19:09,627 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 08:19:09,857 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2019-11-20 08:19:09,858 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:19:09,895 INFO L567 ElimStorePlain]: treesize reduction 14, result has 65.0 percent of original size [2019-11-20 08:19:09,896 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-20 08:19:09,896 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:44, output treesize:26 [2019-11-20 08:19:10,129 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-20 08:19:10,132 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:19:10,133 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 12 [2019-11-20 08:19:10,133 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:19:10,144 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:19:10,145 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:19:10,146 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:30, output treesize:5 [2019-11-20 08:19:10,177 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:19:10,177 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 08:19:10,533 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 17 [2019-11-20 08:19:10,547 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 25 [2019-11-20 08:19:10,548 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-11-20 08:19:10,550 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:19:10,551 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:19:10,577 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:19:10,577 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:19:10,577 INFO L221 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:36, output treesize:25 [2019-11-20 08:19:11,794 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 08:19:11,795 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1979246597] [2019-11-20 08:19:11,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 08:19:11,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 26 [2019-11-20 08:19:11,795 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082797331] [2019-11-20 08:19:11,795 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-20 08:19:11,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 08:19:11,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-20 08:19:11,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=565, Unknown=0, NotChecked=0, Total=650 [2019-11-20 08:19:11,796 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 26 states. [2019-11-20 08:19:12,862 WARN L191 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2019-11-20 08:19:13,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 08:19:13,724 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2019-11-20 08:19:13,727 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-20 08:19:13,727 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 27 [2019-11-20 08:19:13,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 08:19:13,728 INFO L225 Difference]: With dead ends: 44 [2019-11-20 08:19:13,728 INFO L226 Difference]: Without dead ends: 35 [2019-11-20 08:19:13,729 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 26 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=155, Invalid=967, Unknown=0, NotChecked=0, Total=1122 [2019-11-20 08:19:13,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-20 08:19:13,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2019-11-20 08:19:13,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-20 08:19:13,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2019-11-20 08:19:13,743 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 27 [2019-11-20 08:19:13,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 08:19:13,744 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2019-11-20 08:19:13,745 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-20 08:19:13,745 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2019-11-20 08:19:13,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-20 08:19:13,748 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 08:19:13,748 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 08:19:13,951 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:19:13,952 INFO L410 AbstractCegarLoop]: === Iteration 15 === [cstrlenErr1REQUIRES_VIOLATION, cstrlenErr0REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-20 08:19:13,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 08:19:13,952 INFO L82 PathProgramCache]: Analyzing trace with hash 1827827544, now seen corresponding path program 3 times [2019-11-20 08:19:13,952 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 08:19:13,952 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1765166804] [2019-11-20 08:19:13,953 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/cvc4 Starting monitored process 16 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:19:14,264 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-20 08:19:14,264 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-20 08:19:14,266 INFO L255 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-20 08:19:14,267 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 08:19:14,277 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-20 08:19:14,277 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:19:14,288 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:19:14,289 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:19:14,289 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:16 [2019-11-20 08:19:14,351 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2019-11-20 08:19:14,351 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 08:19:14,399 INFO L567 ElimStorePlain]: treesize reduction 16, result has 61.9 percent of original size [2019-11-20 08:19:14,399 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:19:14,399 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:46, output treesize:26 [2019-11-20 08:19:14,542 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:19:14,543 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2019-11-20 08:19:14,543 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:19:14,544 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:19:14,545 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-20 08:19:14,633 INFO L567 ElimStorePlain]: treesize reduction 6, result has 87.0 percent of original size [2019-11-20 08:19:14,633 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:19:14,634 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-20 08:19:14,634 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:49, output treesize:40 [2019-11-20 08:19:14,634 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:19:14,730 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 08:19:14,900 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-20 08:19:14,900 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 08:19:15,174 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-11-20 08:19:17,524 WARN L191 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 28 [2019-11-20 08:19:30,971 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 56 [2019-11-20 08:19:31,019 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2019-11-20 08:19:31,020 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2019-11-20 08:19:31,165 WARN L191 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 27 [2019-11-20 08:19:31,165 INFO L567 ElimStorePlain]: treesize reduction 7, result has 87.3 percent of original size [2019-11-20 08:19:31,166 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:19:31,534 WARN L191 SmtUtils]: Spent 368.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 44 [2019-11-20 08:19:31,535 INFO L567 ElimStorePlain]: treesize reduction 10, result has 90.7 percent of original size [2019-11-20 08:19:31,562 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 46 [2019-11-20 08:19:31,625 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2019-11-20 08:19:31,626 INFO L496 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2019-11-20 08:19:31,771 WARN L191 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 23 [2019-11-20 08:19:31,771 INFO L567 ElimStorePlain]: treesize reduction 7, result has 84.4 percent of original size [2019-11-20 08:19:31,771 INFO L496 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 08:19:31,950 WARN L191 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2019-11-20 08:19:31,950 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 08:19:31,951 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-2 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2019-11-20 08:19:31,951 INFO L221 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:117, output treesize:87 [2019-11-20 08:19:32,662 WARN L191 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2019-11-20 08:19:33,379 WARN L191 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2019-11-20 08:19:33,451 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-20 08:19:33,452 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1765166804] [2019-11-20 08:19:33,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 08:19:33,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 16 [2019-11-20 08:19:33,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061511408] [2019-11-20 08:19:33,452 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-20 08:19:33,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 08:19:33,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-20 08:19:33,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=228, Unknown=3, NotChecked=0, Total=272 [2019-11-20 08:19:33,453 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 17 states. [2019-11-20 08:19:38,491 WARN L191 SmtUtils]: Spent 4.18 s on a formula simplification. DAG size of input: 58 DAG size of output: 39 [2019-11-20 08:19:42,962 WARN L191 SmtUtils]: Spent 4.15 s on a formula simplification. DAG size of input: 50 DAG size of output: 34 [2019-11-20 08:19:51,985 WARN L191 SmtUtils]: Spent 8.58 s on a formula simplification. DAG size of input: 71 DAG size of output: 52 [2019-11-20 08:20:01,454 WARN L191 SmtUtils]: Spent 9.01 s on a formula simplification. DAG size of input: 81 DAG size of output: 60 [2019-11-20 08:20:11,349 WARN L191 SmtUtils]: Spent 9.06 s on a formula simplification. DAG size of input: 77 DAG size of output: 55 [2019-11-20 08:20:20,906 WARN L191 SmtUtils]: Spent 9.17 s on a formula simplification. DAG size of input: 87 DAG size of output: 62 [2019-11-20 08:20:21,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 08:20:21,567 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2019-11-20 08:20:21,571 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-20 08:20:21,572 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2019-11-20 08:20:21,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 08:20:21,572 INFO L225 Difference]: With dead ends: 31 [2019-11-20 08:20:21,572 INFO L226 Difference]: Without dead ends: 0 [2019-11-20 08:20:21,573 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 41 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 64.0s TimeCoverageRelationStatistics Valid=102, Invalid=447, Unknown=3, NotChecked=0, Total=552 [2019-11-20 08:20:21,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-11-20 08:20:21,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-11-20 08:20:21,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-11-20 08:20:21,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-11-20 08:20:21,573 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 31 [2019-11-20 08:20:21,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 08:20:21,574 INFO L462 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-11-20 08:20:21,574 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-20 08:20:21,574 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-11-20 08:20:21,574 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-11-20 08:20:21,774 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 08:20:21,778 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.11 08:20:21 BoogieIcfgContainer [2019-11-20 08:20:21,778 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-20 08:20:21,779 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-20 08:20:21,779 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-20 08:20:21,779 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-20 08:20:21,780 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 08:18:25" (3/4) ... [2019-11-20 08:20:21,784 INFO L137 WitnessPrinter]: Generating witness for correct program [2019-11-20 08:20:21,790 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2019-11-20 08:20:21,790 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_32 [2019-11-20 08:20:21,790 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_64 [2019-11-20 08:20:21,790 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint16_identity [2019-11-20 08:20:21,790 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint64_identity [2019-11-20 08:20:21,790 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure cstrlen [2019-11-20 08:20:21,790 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2019-11-20 08:20:21,791 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint32_identity [2019-11-20 08:20:21,795 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 12 nodes and edges [2019-11-20 08:20:21,795 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2019-11-20 08:20:21,795 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2019-11-20 08:20:21,795 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2019-11-20 08:20:21,831 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_35577e30-180f-4649-b379-4f614d61d54a/bin/uautomizer/witness.graphml [2019-11-20 08:20:21,831 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-20 08:20:21,832 INFO L168 Benchmark]: Toolchain (without parser) took 118195.74 ms. Allocated memory was 1.0 GB in the beginning and 1.4 GB in the end (delta: 329.8 MB). Free memory was 939.3 MB in the beginning and 923.0 MB in the end (delta: 16.3 MB). Peak memory consumption was 346.1 MB. Max. memory is 11.5 GB. [2019-11-20 08:20:21,833 INFO L168 Benchmark]: CDTParser took 0.70 ms. Allocated memory is still 1.0 GB. Free memory is still 967.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-20 08:20:21,833 INFO L168 Benchmark]: CACSL2BoogieTranslator took 526.78 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 158.3 MB). Free memory was 939.3 MB in the beginning and 1.1 GB in the end (delta: -201.2 MB). Peak memory consumption was 18.5 MB. Max. memory is 11.5 GB. [2019-11-20 08:20:21,834 INFO L168 Benchmark]: Boogie Preprocessor took 56.23 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 6.8 MB). Peak memory consumption was 6.8 MB. Max. memory is 11.5 GB. [2019-11-20 08:20:21,834 INFO L168 Benchmark]: RCFGBuilder took 815.92 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 50.7 MB). Peak memory consumption was 50.7 MB. Max. memory is 11.5 GB. [2019-11-20 08:20:21,835 INFO L168 Benchmark]: TraceAbstraction took 116736.07 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 171.4 MB). Free memory was 1.1 GB in the beginning and 935.1 MB in the end (delta: 147.8 MB). Peak memory consumption was 319.3 MB. Max. memory is 11.5 GB. [2019-11-20 08:20:21,835 INFO L168 Benchmark]: Witness Printer took 52.38 ms. Allocated memory is still 1.4 GB. Free memory was 935.1 MB in the beginning and 923.0 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 11.5 GB. [2019-11-20 08:20:21,837 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.70 ms. Allocated memory is still 1.0 GB. Free memory is still 967.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 526.78 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 158.3 MB). Free memory was 939.3 MB in the beginning and 1.1 GB in the end (delta: -201.2 MB). Peak memory consumption was 18.5 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 56.23 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 6.8 MB). Peak memory consumption was 6.8 MB. Max. memory is 11.5 GB. * RCFGBuilder took 815.92 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 50.7 MB). Peak memory consumption was 50.7 MB. Max. memory is 11.5 GB. * TraceAbstraction took 116736.07 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 171.4 MB). Free memory was 1.1 GB in the beginning and 935.1 MB in the end (delta: 147.8 MB). Peak memory consumption was 319.3 MB. Max. memory is 11.5 GB. * Witness Printer took 52.38 ms. Allocated memory is still 1.4 GB. Free memory was 935.1 MB in the beginning and 923.0 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 516]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 516]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 532]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 532]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 520]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 529]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 529]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - AllSpecificationsHoldResult: All specifications hold 7 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 9 procedures, 47 locations, 7 error locations. Result: SAFE, OverallTime: 116.6s, OverallIterations: 15, TraceHistogramMax: 4, AutomataDifference: 66.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 270 SDtfs, 494 SDslu, 1010 SDs, 0 SdLazy, 1311 SolverSat, 144 SolverUnsat, 3 SolverUnknown, 0 SolverNotchecked, 11.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 552 GetRequests, 318 SyntacticMatches, 33 SemanticMatches, 201 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 724 ImplicationChecksByTransitivity, 95.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=50occurred in iteration=9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 15 MinimizatonAttempts, 83 StatesRemovedByMinimization, 11 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.9s SatisfiabilityAnalysisTime, 44.5s InterpolantComputationTime, 253 NumberOfCodeBlocks, 253 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 476 ConstructedInterpolants, 49 QuantifiedInterpolants, 159037 SizeOfPredicates, 98 NumberOfNonLiveVariables, 860 ConjunctsInSsa, 188 ConjunctsInUnsatCore, 30 InterpolantComputations, 16 PerfectInterpolantSequences, 96/174 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...