./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.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_01b04bb5-039c-4573-bd2f-da55c5a49afc/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/bin/uautomizer/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/bin/uautomizer/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 1915ee2ae984f6ece38fc0dcbac99e0ba37faddf ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. 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 09:42:05,600 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-20 09:42:05,603 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-20 09:42:05,618 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-20 09:42:05,619 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-20 09:42:05,620 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-20 09:42:05,622 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-20 09:42:05,630 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-20 09:42:05,635 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-20 09:42:05,638 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-20 09:42:05,639 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-20 09:42:05,641 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-20 09:42:05,641 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-20 09:42:05,643 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-20 09:42:05,644 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-20 09:42:05,645 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-20 09:42:05,646 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-20 09:42:05,647 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-20 09:42:05,650 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-20 09:42:05,653 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-20 09:42:05,657 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-20 09:42:05,659 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-20 09:42:05,662 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-20 09:42:05,663 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-20 09:42:05,665 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-20 09:42:05,666 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-20 09:42:05,666 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-20 09:42:05,667 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-20 09:42:05,668 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-20 09:42:05,669 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-20 09:42:05,669 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-20 09:42:05,669 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-20 09:42:05,670 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-20 09:42:05,671 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-20 09:42:05,672 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-20 09:42:05,672 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-20 09:42:05,673 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-20 09:42:05,673 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-20 09:42:05,673 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-20 09:42:05,674 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-20 09:42:05,675 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-20 09:42:05,676 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/bin/uautomizer/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2019-11-20 09:42:05,700 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-20 09:42:05,710 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-20 09:42:05,711 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-20 09:42:05,711 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-20 09:42:05,711 INFO L138 SettingsManager]: * Use SBE=true [2019-11-20 09:42:05,712 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-20 09:42:05,712 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-20 09:42:05,712 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2019-11-20 09:42:05,712 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-20 09:42:05,713 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-20 09:42:05,713 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-20 09:42:05,713 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2019-11-20 09:42:05,713 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2019-11-20 09:42:05,713 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2019-11-20 09:42:05,714 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-20 09:42:05,714 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2019-11-20 09:42:05,714 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2019-11-20 09:42:05,714 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-20 09:42:05,716 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-20 09:42:05,716 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-20 09:42:05,716 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-20 09:42:05,716 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-20 09:42:05,717 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-20 09:42:05,717 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-20 09:42:05,717 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-20 09:42:05,717 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-20 09:42:05,718 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2019-11-20 09:42:05,718 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --rewrite-divk --print-success --lang smt [2019-11-20 09:42:05,719 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-20 09:42:05,719 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_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 -> 1915ee2ae984f6ece38fc0dcbac99e0ba37faddf [2019-11-20 09:42:05,857 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-20 09:42:05,867 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-20 09:42:05,870 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-20 09:42:05,872 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-20 09:42:05,873 INFO L275 PluginConnector]: CDTParser initialized [2019-11-20 09:42:05,874 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/bin/uautomizer/../../sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i [2019-11-20 09:42:05,933 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/bin/uautomizer/data/9a97861f9/a39f46512b074ab099f754a1efa93e19/FLAG9cd25b878 [2019-11-20 09:42:06,374 INFO L306 CDTParser]: Found 1 translation units. [2019-11-20 09:42:06,375 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i [2019-11-20 09:42:06,385 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/bin/uautomizer/data/9a97861f9/a39f46512b074ab099f754a1efa93e19/FLAG9cd25b878 [2019-11-20 09:42:06,398 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/bin/uautomizer/data/9a97861f9/a39f46512b074ab099f754a1efa93e19 [2019-11-20 09:42:06,400 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-20 09:42:06,401 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-20 09:42:06,402 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-20 09:42:06,402 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-20 09:42:06,405 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-20 09:42:06,407 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 09:42:06" (1/1) ... [2019-11-20 09:42:06,410 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@51fa171c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:42:06, skipping insertion in model container [2019-11-20 09:42:06,410 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 09:42:06" (1/1) ... [2019-11-20 09:42:06,417 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-20 09:42:06,449 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-20 09:42:06,785 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-20 09:42:06,801 INFO L188 MainTranslator]: Completed pre-run [2019-11-20 09:42:06,857 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-20 09:42:06,928 INFO L192 MainTranslator]: Completed translation [2019-11-20 09:42:06,928 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:42:06 WrapperNode [2019-11-20 09:42:06,929 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-20 09:42:06,929 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-20 09:42:06,930 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-20 09:42:06,930 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-20 09:42:06,942 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:42:06" (1/1) ... [2019-11-20 09:42:06,942 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:42:06" (1/1) ... [2019-11-20 09:42:06,959 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:42:06" (1/1) ... [2019-11-20 09:42:06,959 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:42:06" (1/1) ... [2019-11-20 09:42:06,973 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:42:06" (1/1) ... [2019-11-20 09:42:06,977 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:42:06" (1/1) ... [2019-11-20 09:42:06,980 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:42:06" (1/1) ... [2019-11-20 09:42:06,986 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-20 09:42:06,986 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-20 09:42:06,987 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-20 09:42:06,987 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-20 09:42:06,988 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:42:06" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 09:42:07,041 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-20 09:42:07,041 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-20 09:42:07,041 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2019-11-20 09:42:07,042 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2019-11-20 09:42:07,042 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2019-11-20 09:42:07,042 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2019-11-20 09:42:07,042 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2019-11-20 09:42:07,043 INFO L138 BoogieDeclarations]: Found implementation of procedure strlen_rec [2019-11-20 09:42:07,043 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-20 09:42:07,043 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2019-11-20 09:42:07,043 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2019-11-20 09:42:07,044 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2019-11-20 09:42:07,044 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2019-11-20 09:42:07,044 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2019-11-20 09:42:07,044 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2019-11-20 09:42:07,045 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2019-11-20 09:42:07,045 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2019-11-20 09:42:07,045 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2019-11-20 09:42:07,045 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2019-11-20 09:42:07,046 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2019-11-20 09:42:07,046 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2019-11-20 09:42:07,046 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2019-11-20 09:42:07,046 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2019-11-20 09:42:07,046 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2019-11-20 09:42:07,047 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2019-11-20 09:42:07,047 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2019-11-20 09:42:07,047 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2019-11-20 09:42:07,047 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2019-11-20 09:42:07,048 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2019-11-20 09:42:07,048 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2019-11-20 09:42:07,048 INFO L130 BoogieDeclarations]: Found specification of procedure select [2019-11-20 09:42:07,048 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2019-11-20 09:42:07,049 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2019-11-20 09:42:07,049 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2019-11-20 09:42:07,049 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2019-11-20 09:42:07,049 INFO L130 BoogieDeclarations]: Found specification of procedure random [2019-11-20 09:42:07,049 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2019-11-20 09:42:07,050 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2019-11-20 09:42:07,050 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2019-11-20 09:42:07,050 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2019-11-20 09:42:07,050 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2019-11-20 09:42:07,050 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2019-11-20 09:42:07,051 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2019-11-20 09:42:07,051 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2019-11-20 09:42:07,051 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2019-11-20 09:42:07,051 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2019-11-20 09:42:07,051 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2019-11-20 09:42:07,052 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2019-11-20 09:42:07,052 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2019-11-20 09:42:07,052 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2019-11-20 09:42:07,052 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2019-11-20 09:42:07,052 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2019-11-20 09:42:07,052 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2019-11-20 09:42:07,053 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2019-11-20 09:42:07,053 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2019-11-20 09:42:07,053 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2019-11-20 09:42:07,053 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2019-11-20 09:42:07,053 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2019-11-20 09:42:07,054 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2019-11-20 09:42:07,054 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2019-11-20 09:42:07,054 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2019-11-20 09:42:07,054 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2019-11-20 09:42:07,054 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2019-11-20 09:42:07,055 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2019-11-20 09:42:07,055 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-11-20 09:42:07,055 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2019-11-20 09:42:07,055 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2019-11-20 09:42:07,055 INFO L130 BoogieDeclarations]: Found specification of procedure free [2019-11-20 09:42:07,056 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2019-11-20 09:42:07,056 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2019-11-20 09:42:07,056 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2019-11-20 09:42:07,056 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2019-11-20 09:42:07,056 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2019-11-20 09:42:07,057 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2019-11-20 09:42:07,057 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2019-11-20 09:42:07,057 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2019-11-20 09:42:07,057 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-20 09:42:07,057 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2019-11-20 09:42:07,058 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2019-11-20 09:42:07,058 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2019-11-20 09:42:07,058 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2019-11-20 09:42:07,058 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2019-11-20 09:42:07,059 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2019-11-20 09:42:07,059 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2019-11-20 09:42:07,059 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2019-11-20 09:42:07,059 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2019-11-20 09:42:07,059 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2019-11-20 09:42:07,060 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2019-11-20 09:42:07,060 INFO L130 BoogieDeclarations]: Found specification of procedure system [2019-11-20 09:42:07,060 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2019-11-20 09:42:07,060 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2019-11-20 09:42:07,060 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2019-11-20 09:42:07,061 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2019-11-20 09:42:07,061 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2019-11-20 09:42:07,061 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2019-11-20 09:42:07,061 INFO L130 BoogieDeclarations]: Found specification of procedure div [2019-11-20 09:42:07,062 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2019-11-20 09:42:07,062 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2019-11-20 09:42:07,062 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2019-11-20 09:42:07,062 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2019-11-20 09:42:07,062 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2019-11-20 09:42:07,063 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2019-11-20 09:42:07,063 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2019-11-20 09:42:07,063 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2019-11-20 09:42:07,063 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2019-11-20 09:42:07,064 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2019-11-20 09:42:07,064 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2019-11-20 09:42:07,064 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2019-11-20 09:42:07,064 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2019-11-20 09:42:07,064 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2019-11-20 09:42:07,065 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2019-11-20 09:42:07,065 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2019-11-20 09:42:07,065 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2019-11-20 09:42:07,065 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2019-11-20 09:42:07,065 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2019-11-20 09:42:07,066 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2019-11-20 09:42:07,066 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-20 09:42:07,066 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2019-11-20 09:42:07,066 INFO L130 BoogieDeclarations]: Found specification of procedure strlen_rec [2019-11-20 09:42:07,067 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2019-11-20 09:42:07,067 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-20 09:42:07,067 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-20 09:42:07,067 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2019-11-20 09:42:07,067 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-20 09:42:07,068 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-20 09:42:07,068 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-20 09:42:07,487 INFO L280 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-20 09:42:07,487 INFO L285 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-20 09:42:07,488 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 09:42:07 BoogieIcfgContainer [2019-11-20 09:42:07,488 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-20 09:42:07,489 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-20 09:42:07,490 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-20 09:42:07,492 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-20 09:42:07,492 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 09:42:06" (1/3) ... [2019-11-20 09:42:07,493 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@700b8d54 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 09:42:07, skipping insertion in model container [2019-11-20 09:42:07,493 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 09:42:06" (2/3) ... [2019-11-20 09:42:07,494 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@700b8d54 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 09:42:07, skipping insertion in model container [2019-11-20 09:42:07,494 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 09:42:07" (3/3) ... [2019-11-20 09:42:07,495 INFO L109 eAbstractionObserver]: Analyzing ICFG rec_strlen-alloca-1.i [2019-11-20 09:42:07,504 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-20 09:42:07,510 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 7 error locations. [2019-11-20 09:42:07,521 INFO L249 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2019-11-20 09:42:07,539 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-20 09:42:07,539 INFO L374 AbstractCegarLoop]: Hoare is false [2019-11-20 09:42:07,539 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-20 09:42:07,539 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-20 09:42:07,540 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-20 09:42:07,540 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-20 09:42:07,540 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-20 09:42:07,540 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-20 09:42:07,555 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2019-11-20 09:42:07,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-20 09:42:07,564 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 09:42:07,564 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 09:42:07,565 INFO L410 AbstractCegarLoop]: === Iteration 1 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2019-11-20 09:42:07,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 09:42:07,570 INFO L82 PathProgramCache]: Analyzing trace with hash -2117754822, now seen corresponding path program 1 times [2019-11-20 09:42:07,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 09:42:07,581 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1873166681] [2019-11-20 09:42:07,581 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 09:42:07,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 09:42:07,782 INFO L255 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-20 09:42:07,787 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 09:42:07,846 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 09:42:07,847 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:42:07,855 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:07,855 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:42:07,856 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-20 09:42:07,872 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 09:42:07,872 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 09:42:07,889 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 09:42:07,890 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1873166681] [2019-11-20 09:42:07,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 09:42:07,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2019-11-20 09:42:07,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945068422] [2019-11-20 09:42:07,896 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-20 09:42:07,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 09:42:07,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-20 09:42:07,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-20 09:42:07,915 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 3 states. [2019-11-20 09:42:08,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 09:42:08,006 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2019-11-20 09:42:08,007 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-20 09:42:08,008 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-11-20 09:42:08,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 09:42:08,018 INFO L225 Difference]: With dead ends: 31 [2019-11-20 09:42:08,019 INFO L226 Difference]: Without dead ends: 28 [2019-11-20 09:42:08,021 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 09:42:08,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-20 09:42:08,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-11-20 09:42:08,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-20 09:42:08,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2019-11-20 09:42:08,088 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 10 [2019-11-20 09:42:08,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 09:42:08,088 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2019-11-20 09:42:08,088 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-20 09:42:08,089 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2019-11-20 09:42:08,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-20 09:42:08,091 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 09:42:08,091 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 09:42:08,295 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 09:42:08,295 INFO L410 AbstractCegarLoop]: === Iteration 2 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2019-11-20 09:42:08,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 09:42:08,295 INFO L82 PathProgramCache]: Analyzing trace with hash -2117754821, now seen corresponding path program 1 times [2019-11-20 09:42:08,296 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 09:42:08,296 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [436682768] [2019-11-20 09:42:08,296 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 09:42:08,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 09:42:08,461 INFO L255 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-20 09:42:08,462 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 09:42:08,488 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 09:42:08,489 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:42:08,500 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:08,500 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:42:08,500 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:14 [2019-11-20 09:42:08,522 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 09:42:08,523 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 09:42:08,674 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 09:42:08,674 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [436682768] [2019-11-20 09:42:08,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 09:42:08,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2019-11-20 09:42:08,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574135156] [2019-11-20 09:42:08,676 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-20 09:42:08,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 09:42:08,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-20 09:42:08,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-20 09:42:08,677 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 6 states. [2019-11-20 09:42:08,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 09:42:08,982 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2019-11-20 09:42:08,985 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-20 09:42:08,985 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2019-11-20 09:42:08,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 09:42:08,986 INFO L225 Difference]: With dead ends: 38 [2019-11-20 09:42:08,987 INFO L226 Difference]: Without dead ends: 38 [2019-11-20 09:42:08,987 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 09:42:08,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-11-20 09:42:08,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 27. [2019-11-20 09:42:08,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-20 09:42:08,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2019-11-20 09:42:08,994 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 10 [2019-11-20 09:42:08,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 09:42:08,995 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2019-11-20 09:42:08,995 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-20 09:42:08,995 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2019-11-20 09:42:08,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-20 09:42:08,995 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 09:42:08,996 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 09:42:09,196 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 09:42:09,197 INFO L410 AbstractCegarLoop]: === Iteration 3 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2019-11-20 09:42:09,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 09:42:09,197 INFO L82 PathProgramCache]: Analyzing trace with hash -2117754768, now seen corresponding path program 1 times [2019-11-20 09:42:09,197 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 09:42:09,197 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1525008846] [2019-11-20 09:42:09,198 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 09:42:09,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 09:42:09,362 INFO L255 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-20 09:42:09,363 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 09:42:09,384 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 09:42:09,384 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 09:42:09,424 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 09:42:09,424 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1525008846] [2019-11-20 09:42:09,425 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 09:42:09,425 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2019-11-20 09:42:09,425 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625394295] [2019-11-20 09:42:09,425 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-20 09:42:09,425 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 09:42:09,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-20 09:42:09,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-20 09:42:09,426 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand 6 states. [2019-11-20 09:42:09,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 09:42:09,512 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2019-11-20 09:42:09,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-20 09:42:09,514 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2019-11-20 09:42:09,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 09:42:09,515 INFO L225 Difference]: With dead ends: 34 [2019-11-20 09:42:09,515 INFO L226 Difference]: Without dead ends: 34 [2019-11-20 09:42:09,515 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 09:42:09,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-20 09:42:09,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2019-11-20 09:42:09,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-20 09:42:09,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2019-11-20 09:42:09,527 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 10 [2019-11-20 09:42:09,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 09:42:09,527 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2019-11-20 09:42:09,528 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-20 09:42:09,528 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2019-11-20 09:42:09,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-20 09:42:09,529 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 09:42:09,529 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 09:42:09,732 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 09:42:09,733 INFO L410 AbstractCegarLoop]: === Iteration 4 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2019-11-20 09:42:09,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 09:42:09,733 INFO L82 PathProgramCache]: Analyzing trace with hash -2117695186, now seen corresponding path program 1 times [2019-11-20 09:42:09,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 09:42:09,735 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [178683618] [2019-11-20 09:42:09,735 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 09:42:09,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 09:42:09,925 INFO L255 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-20 09:42:09,926 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 09:42:09,948 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 09:42:09,948 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:42:09,968 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:09,968 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 09:42:09,969 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:17, output treesize:13 [2019-11-20 09:42:09,988 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 09:42:09,989 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 09:42:10,098 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 09:42:10,098 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [178683618] [2019-11-20 09:42:10,099 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 09:42:10,099 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2019-11-20 09:42:10,099 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668714833] [2019-11-20 09:42:10,099 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-20 09:42:10,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 09:42:10,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-20 09:42:10,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-20 09:42:10,100 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 5 states. [2019-11-20 09:42:10,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 09:42:10,380 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2019-11-20 09:42:10,386 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-20 09:42:10,386 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2019-11-20 09:42:10,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 09:42:10,387 INFO L225 Difference]: With dead ends: 38 [2019-11-20 09:42:10,387 INFO L226 Difference]: Without dead ends: 38 [2019-11-20 09:42:10,388 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 09:42:10,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-11-20 09:42:10,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2019-11-20 09:42:10,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-20 09:42:10,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2019-11-20 09:42:10,393 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 10 [2019-11-20 09:42:10,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 09:42:10,393 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2019-11-20 09:42:10,393 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-20 09:42:10,393 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2019-11-20 09:42:10,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-20 09:42:10,394 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 09:42:10,394 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 09:42:10,599 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 09:42:10,600 INFO L410 AbstractCegarLoop]: === Iteration 5 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2019-11-20 09:42:10,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 09:42:10,600 INFO L82 PathProgramCache]: Analyzing trace with hash -1259263901, now seen corresponding path program 1 times [2019-11-20 09:42:10,600 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 09:42:10,601 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [394790212] [2019-11-20 09:42:10,601 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 09:42:10,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 09:42:10,788 INFO L255 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-20 09:42:10,789 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 09:42:10,798 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 09:42:10,798 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:42:10,801 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:10,801 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:42:10,801 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-20 09:42:10,827 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 09:42:10,827 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 09:42:10,847 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 09:42:10,847 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [394790212] [2019-11-20 09:42:10,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 09:42:10,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2019-11-20 09:42:10,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271277328] [2019-11-20 09:42:10,848 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-20 09:42:10,848 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 09:42:10,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-20 09:42:10,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-20 09:42:10,849 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 5 states. [2019-11-20 09:42:10,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 09:42:10,942 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2019-11-20 09:42:10,943 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-20 09:42:10,943 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2019-11-20 09:42:10,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 09:42:10,944 INFO L225 Difference]: With dead ends: 30 [2019-11-20 09:42:10,944 INFO L226 Difference]: Without dead ends: 30 [2019-11-20 09:42:10,944 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 09:42:10,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-11-20 09:42:10,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2019-11-20 09:42:10,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-20 09:42:10,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2019-11-20 09:42:10,950 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 13 [2019-11-20 09:42:10,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 09:42:10,951 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2019-11-20 09:42:10,951 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-20 09:42:10,951 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2019-11-20 09:42:10,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-20 09:42:10,951 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 09:42:10,952 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 09:42:11,157 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 09:42:11,157 INFO L410 AbstractCegarLoop]: === Iteration 6 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2019-11-20 09:42:11,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 09:42:11,157 INFO L82 PathProgramCache]: Analyzing trace with hash -1259263900, now seen corresponding path program 1 times [2019-11-20 09:42:11,157 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 09:42:11,158 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1514988661] [2019-11-20 09:42:11,158 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 09:42:11,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 09:42:11,316 INFO L255 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-20 09:42:11,317 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 09:42:11,326 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 09:42:11,326 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:42:11,331 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:11,331 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:42:11,331 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2019-11-20 09:42:11,380 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 09:42:11,380 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 09:42:11,575 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 09:42:11,575 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1514988661] [2019-11-20 09:42:11,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 09:42:11,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 9 [2019-11-20 09:42:11,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768905005] [2019-11-20 09:42:11,576 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-20 09:42:11,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 09:42:11,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-20 09:42:11,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2019-11-20 09:42:11,577 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 10 states. [2019-11-20 09:42:12,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 09:42:12,010 INFO L93 Difference]: Finished difference Result 49 states and 55 transitions. [2019-11-20 09:42:12,011 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-20 09:42:12,011 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2019-11-20 09:42:12,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 09:42:12,013 INFO L225 Difference]: With dead ends: 49 [2019-11-20 09:42:12,013 INFO L226 Difference]: Without dead ends: 49 [2019-11-20 09:42:12,014 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2019-11-20 09:42:12,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-11-20 09:42:12,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 37. [2019-11-20 09:42:12,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-11-20 09:42:12,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2019-11-20 09:42:12,019 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 13 [2019-11-20 09:42:12,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 09:42:12,019 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2019-11-20 09:42:12,020 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-20 09:42:12,020 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2019-11-20 09:42:12,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-20 09:42:12,020 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 09:42:12,021 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 09:42:12,223 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 09:42:12,223 INFO L410 AbstractCegarLoop]: === Iteration 7 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2019-11-20 09:42:12,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 09:42:12,224 INFO L82 PathProgramCache]: Analyzing trace with hash -1143813903, now seen corresponding path program 1 times [2019-11-20 09:42:12,224 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 09:42:12,224 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [912672479] [2019-11-20 09:42:12,224 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 09:42:12,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 09:42:12,359 INFO L255 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-20 09:42:12,360 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 09:42:12,378 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 09:42:12,379 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:42:12,401 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:12,401 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:42:12,401 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:16 [2019-11-20 09:42:12,503 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 09:42:12,503 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 09:42:12,960 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 09:42:12,960 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [912672479] [2019-11-20 09:42:12,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 09:42:12,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 9 [2019-11-20 09:42:12,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904019474] [2019-11-20 09:42:12,961 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-20 09:42:12,961 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 09:42:12,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-20 09:42:12,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2019-11-20 09:42:12,962 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand 10 states. [2019-11-20 09:42:13,806 WARN L191 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 26 [2019-11-20 09:42:14,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 09:42:14,120 INFO L93 Difference]: Finished difference Result 60 states and 67 transitions. [2019-11-20 09:42:14,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-20 09:42:14,121 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 14 [2019-11-20 09:42:14,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 09:42:14,122 INFO L225 Difference]: With dead ends: 60 [2019-11-20 09:42:14,122 INFO L226 Difference]: Without dead ends: 60 [2019-11-20 09:42:14,123 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2019-11-20 09:42:14,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-11-20 09:42:14,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 45. [2019-11-20 09:42:14,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-11-20 09:42:14,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 52 transitions. [2019-11-20 09:42:14,129 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 52 transitions. Word has length 14 [2019-11-20 09:42:14,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 09:42:14,129 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 52 transitions. [2019-11-20 09:42:14,129 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-20 09:42:14,129 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 52 transitions. [2019-11-20 09:42:14,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-20 09:42:14,130 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 09:42:14,130 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 09:42:14,331 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 09:42:14,331 INFO L410 AbstractCegarLoop]: === Iteration 8 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2019-11-20 09:42:14,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 09:42:14,331 INFO L82 PathProgramCache]: Analyzing trace with hash 228211982, now seen corresponding path program 1 times [2019-11-20 09:42:14,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 09:42:14,332 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [843611899] [2019-11-20 09:42:14,332 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 09:42:14,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 09:42:14,464 INFO L255 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-20 09:42:14,466 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 09:42:14,485 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 09:42:14,485 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:42:14,489 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:14,490 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:42:14,490 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:16, output treesize:12 [2019-11-20 09:42:14,526 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 09:42:14,527 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:42:14,529 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:14,529 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 09:42:14,529 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:17, output treesize:5 [2019-11-20 09:42:14,540 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 09:42:14,541 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 09:42:14,607 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 09:42:14,617 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 09:42:14,618 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-11-20 09:42:14,620 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:14,620 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:42:14,621 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:14,622 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:42:14,622 INFO L221 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:17, output treesize:6 [2019-11-20 09:42:14,629 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 09:42:14,630 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [843611899] [2019-11-20 09:42:14,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 09:42:14,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 7] imperfect sequences [] total 11 [2019-11-20 09:42:14,630 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041816564] [2019-11-20 09:42:14,630 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-20 09:42:14,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 09:42:14,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-20 09:42:14,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2019-11-20 09:42:14,631 INFO L87 Difference]: Start difference. First operand 45 states and 52 transitions. Second operand 11 states. [2019-11-20 09:42:14,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 09:42:14,834 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2019-11-20 09:42:14,835 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-20 09:42:14,835 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 17 [2019-11-20 09:42:14,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 09:42:14,836 INFO L225 Difference]: With dead ends: 55 [2019-11-20 09:42:14,836 INFO L226 Difference]: Without dead ends: 55 [2019-11-20 09:42:14,837 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 21 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 09:42:14,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-11-20 09:42:14,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2019-11-20 09:42:14,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-11-20 09:42:14,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 59 transitions. [2019-11-20 09:42:14,844 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 59 transitions. Word has length 17 [2019-11-20 09:42:14,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 09:42:14,845 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 59 transitions. [2019-11-20 09:42:14,845 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-20 09:42:14,845 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 59 transitions. [2019-11-20 09:42:14,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-20 09:42:14,845 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 09:42:14,845 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 09:42:15,046 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 09:42:15,046 INFO L410 AbstractCegarLoop]: === Iteration 9 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2019-11-20 09:42:15,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 09:42:15,046 INFO L82 PathProgramCache]: Analyzing trace with hash 929276560, now seen corresponding path program 1 times [2019-11-20 09:42:15,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 09:42:15,046 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [2012775036] [2019-11-20 09:42:15,047 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 09:42:15,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 09:42:15,184 INFO L255 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-20 09:42:15,186 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 09:42:15,196 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 09:42:15,196 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:42:15,204 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:15,204 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:42:15,204 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:14, output treesize:13 [2019-11-20 09:42:15,246 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 09:42:15,246 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:42:15,281 INFO L567 ElimStorePlain]: treesize reduction 20, result has 53.5 percent of original size [2019-11-20 09:42:15,281 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:42:15,282 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:47, output treesize:23 [2019-11-20 09:42:15,383 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:15,383 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 09:42:15,384 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 09:42:15,386 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 09:42:15,387 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 09:42:15,402 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:15,402 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 09:42:15,403 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 09:42:15,403 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:27 [2019-11-20 09:42:15,404 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 09:42:15,449 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 09:42:15,747 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 09:42:15,747 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 09:42:16,439 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 09:42:16,475 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 09:42:16,476 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2019-11-20 09:42:16,535 INFO L567 ElimStorePlain]: treesize reduction 7, result has 81.1 percent of original size [2019-11-20 09:42:16,535 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:42:16,545 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 09:42:16,579 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 09:42:16,580 INFO L496 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2019-11-20 09:42:16,705 WARN L191 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2019-11-20 09:42:16,705 INFO L567 ElimStorePlain]: treesize reduction 7, result has 81.1 percent of original size [2019-11-20 09:42:16,706 INFO L496 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:42:16,723 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 09:42:16,729 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-20 09:42:16,736 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-20 09:42:16,743 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 09:42:16,745 INFO L496 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2019-11-20 09:42:16,775 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:16,775 INFO L496 ElimStorePlain]: Start of recursive call 6: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:42:16,907 WARN L191 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2019-11-20 09:42:16,908 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:16,908 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 3 xjuncts. [2019-11-20 09:42:16,908 INFO L221 ElimStorePlain]: Needed 7 recursive calls to eliminate 1 variables, input treesize:119, output treesize:83 [2019-11-20 09:42:17,179 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 09:42:17,180 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2012775036] [2019-11-20 09:42:17,180 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 09:42:17,180 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 18 [2019-11-20 09:42:17,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161846445] [2019-11-20 09:42:17,180 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-20 09:42:17,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 09:42:17,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-20 09:42:17,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=289, Unknown=0, NotChecked=0, Total=342 [2019-11-20 09:42:17,181 INFO L87 Difference]: Start difference. First operand 52 states and 59 transitions. Second operand 19 states. [2019-11-20 09:42:17,490 WARN L191 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2019-11-20 09:42:20,902 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2019-11-20 09:42:21,167 WARN L191 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 50 [2019-11-20 09:42:21,397 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 31 [2019-11-20 09:42:24,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 09:42:24,140 INFO L93 Difference]: Finished difference Result 70 states and 79 transitions. [2019-11-20 09:42:24,141 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-20 09:42:24,142 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 17 [2019-11-20 09:42:24,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 09:42:24,143 INFO L225 Difference]: With dead ends: 70 [2019-11-20 09:42:24,143 INFO L226 Difference]: Without dead ends: 70 [2019-11-20 09:42:24,144 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=155, Invalid=715, Unknown=0, NotChecked=0, Total=870 [2019-11-20 09:42:24,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-11-20 09:42:24,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 66. [2019-11-20 09:42:24,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-11-20 09:42:24,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 75 transitions. [2019-11-20 09:42:24,152 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 75 transitions. Word has length 17 [2019-11-20 09:42:24,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 09:42:24,152 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 75 transitions. [2019-11-20 09:42:24,152 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-20 09:42:24,152 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 75 transitions. [2019-11-20 09:42:24,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-20 09:42:24,153 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 09:42:24,153 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 09:42:24,355 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 09:42:24,355 INFO L410 AbstractCegarLoop]: === Iteration 10 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2019-11-20 09:42:24,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 09:42:24,356 INFO L82 PathProgramCache]: Analyzing trace with hash -1516451273, now seen corresponding path program 1 times [2019-11-20 09:42:24,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 09:42:24,356 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1546805987] [2019-11-20 09:42:24,356 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 09:42:24,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 09:42:24,491 INFO L255 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-20 09:42:24,493 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 09:42:24,496 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 09:42:24,497 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:42:24,501 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:24,502 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:42:24,502 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-20 09:42:24,548 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:24,548 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 09:42:24,549 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:42:24,567 INFO L567 ElimStorePlain]: treesize reduction 10, result has 60.0 percent of original size [2019-11-20 09:42:24,567 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 09:42:24,568 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 09:42:24,568 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:17, output treesize:15 [2019-11-20 09:42:24,568 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 09:42:24,576 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 09:42:24,591 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 09:42:24,601 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 09:42:24,618 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 09:42:24,627 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 09:42:24,643 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 09:42:24,643 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 09:42:26,750 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 09:42:26,750 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1546805987] [2019-11-20 09:42:26,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-20 09:42:26,750 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 8 [2019-11-20 09:42:26,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309076019] [2019-11-20 09:42:26,751 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-20 09:42:26,751 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 09:42:26,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-20 09:42:26,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=50, Unknown=1, NotChecked=0, Total=72 [2019-11-20 09:42:26,751 INFO L87 Difference]: Start difference. First operand 66 states and 75 transitions. Second operand 9 states. [2019-11-20 09:42:26,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 09:42:26,910 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2019-11-20 09:42:26,910 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-20 09:42:26,911 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 18 [2019-11-20 09:42:26,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 09:42:26,911 INFO L225 Difference]: With dead ends: 65 [2019-11-20 09:42:26,911 INFO L226 Difference]: Without dead ends: 42 [2019-11-20 09:42:26,912 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 23 SyntacticMatches, 6 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=34, Invalid=75, Unknown=1, NotChecked=0, Total=110 [2019-11-20 09:42:26,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-11-20 09:42:26,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2019-11-20 09:42:26,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-20 09:42:26,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2019-11-20 09:42:26,916 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 18 [2019-11-20 09:42:26,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 09:42:26,916 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2019-11-20 09:42:26,916 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-20 09:42:26,916 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2019-11-20 09:42:26,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-20 09:42:26,917 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 09:42:26,918 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 09:42:27,118 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 09:42:27,118 INFO L410 AbstractCegarLoop]: === Iteration 11 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2019-11-20 09:42:27,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 09:42:27,119 INFO L82 PathProgramCache]: Analyzing trace with hash 370178788, now seen corresponding path program 2 times [2019-11-20 09:42:27,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 09:42:27,119 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1716872917] [2019-11-20 09:42:27,119 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 09:42:27,314 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-20 09:42:27,314 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-20 09:42:27,317 INFO L255 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 29 conjunts are in the unsatisfiable core [2019-11-20 09:42:27,319 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 09:42:27,332 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 09:42:27,332 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:42:27,347 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:27,347 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:42:27,347 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:16 [2019-11-20 09:42:27,569 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-20 09:42:27,570 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 09:42:29,583 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 09:42:29,583 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1716872917] [2019-11-20 09:42:29,584 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 09:42:29,584 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 21 [2019-11-20 09:42:29,584 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601120178] [2019-11-20 09:42:29,585 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-20 09:42:29,585 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 09:42:29,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-20 09:42:29,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2019-11-20 09:42:29,586 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand 21 states. [2019-11-20 09:42:31,394 WARN L191 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2019-11-20 09:42:32,104 WARN L191 SmtUtils]: Spent 402.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 41 [2019-11-20 09:42:32,576 WARN L191 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2019-11-20 09:42:33,308 WARN L191 SmtUtils]: Spent 470.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 39 [2019-11-20 09:42:33,896 WARN L191 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2019-11-20 09:42:34,366 WARN L191 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 28 [2019-11-20 09:42:34,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 09:42:34,785 INFO L93 Difference]: Finished difference Result 66 states and 69 transitions. [2019-11-20 09:42:34,786 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-20 09:42:34,786 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 25 [2019-11-20 09:42:34,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 09:42:34,786 INFO L225 Difference]: With dead ends: 66 [2019-11-20 09:42:34,787 INFO L226 Difference]: Without dead ends: 58 [2019-11-20 09:42:34,787 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=146, Invalid=910, Unknown=0, NotChecked=0, Total=1056 [2019-11-20 09:42:34,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-11-20 09:42:34,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 46. [2019-11-20 09:42:34,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-20 09:42:34,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2019-11-20 09:42:34,793 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 25 [2019-11-20 09:42:34,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 09:42:34,793 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2019-11-20 09:42:34,793 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-20 09:42:34,794 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2019-11-20 09:42:34,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-20 09:42:34,795 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 09:42:34,795 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 09:42:34,998 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 09:42:34,998 INFO L410 AbstractCegarLoop]: === Iteration 12 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2019-11-20 09:42:34,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 09:42:34,998 INFO L82 PathProgramCache]: Analyzing trace with hash -941540361, now seen corresponding path program 2 times [2019-11-20 09:42:34,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 09:42:34,998 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1143341103] [2019-11-20 09:42:34,999 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 09:42:35,188 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-20 09:42:35,188 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-20 09:42:35,189 INFO L255 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-20 09:42:35,190 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 09:42:35,201 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 09:42:35,201 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:42:35,215 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:42:35,216 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:42:35,216 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:14, output treesize:13 [2019-11-20 09:42:35,410 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 09:42:35,410 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 09:42:36,920 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-11-20 09:42:41,782 WARN L191 SmtUtils]: Spent 2.34 s on a formula simplification that was a NOOP. DAG size: 31 [2019-11-20 09:43:06,943 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 09:43:06,943 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1143341103] [2019-11-20 09:43:06,944 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 09:43:06,944 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 13 [2019-11-20 09:43:06,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786924804] [2019-11-20 09:43:06,944 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-20 09:43:06,944 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 09:43:06,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-20 09:43:06,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=123, Unknown=2, NotChecked=0, Total=182 [2019-11-20 09:43:06,945 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 14 states. [2019-11-20 09:43:07,553 WARN L191 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 16 [2019-11-20 09:43:08,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 09:43:08,159 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2019-11-20 09:43:08,161 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-20 09:43:08,161 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 22 [2019-11-20 09:43:08,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 09:43:08,162 INFO L225 Difference]: With dead ends: 45 [2019-11-20 09:43:08,162 INFO L226 Difference]: Without dead ends: 45 [2019-11-20 09:43:08,162 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 23 SyntacticMatches, 8 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 32.2s TimeCoverageRelationStatistics Valid=84, Invalid=154, Unknown=2, NotChecked=0, Total=240 [2019-11-20 09:43:08,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-11-20 09:43:08,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 40. [2019-11-20 09:43:08,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-20 09:43:08,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2019-11-20 09:43:08,166 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 22 [2019-11-20 09:43:08,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 09:43:08,166 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2019-11-20 09:43:08,166 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-20 09:43:08,166 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2019-11-20 09:43:08,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-20 09:43:08,167 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 09:43:08,167 INFO L410 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 09:43:08,370 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 09:43:08,371 INFO L410 AbstractCegarLoop]: === Iteration 13 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2019-11-20 09:43:08,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 09:43:08,371 INFO L82 PathProgramCache]: Analyzing trace with hash 675805931, now seen corresponding path program 1 times [2019-11-20 09:43:08,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 09:43:08,371 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1624800773] [2019-11-20 09:43:08,371 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 09:43:08,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 09:43:08,585 INFO L255 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-20 09:43:08,592 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 09:43:08,608 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 09:43:08,608 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:43:08,619 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:43:08,619 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:43:08,619 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2019-11-20 09:43:09,018 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 20 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-20 09:43:09,018 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 09:43:10,011 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 20 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-20 09:43:10,011 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1624800773] [2019-11-20 09:43:10,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 09:43:10,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2019-11-20 09:43:10,012 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792422144] [2019-11-20 09:43:10,012 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-20 09:43:10,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 09:43:10,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-20 09:43:10,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=393, Unknown=0, NotChecked=0, Total=462 [2019-11-20 09:43:10,013 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 22 states. [2019-11-20 09:43:10,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 09:43:10,875 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2019-11-20 09:43:10,876 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-20 09:43:10,877 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 33 [2019-11-20 09:43:10,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 09:43:10,878 INFO L225 Difference]: With dead ends: 49 [2019-11-20 09:43:10,878 INFO L226 Difference]: Without dead ends: 37 [2019-11-20 09:43:10,878 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=101, Invalid=549, Unknown=0, NotChecked=0, Total=650 [2019-11-20 09:43:10,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-20 09:43:10,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2019-11-20 09:43:10,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-20 09:43:10,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2019-11-20 09:43:10,881 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 33 [2019-11-20 09:43:10,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 09:43:10,881 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2019-11-20 09:43:10,881 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-20 09:43:10,882 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2019-11-20 09:43:10,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-20 09:43:10,883 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 09:43:10,883 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 09:43:11,087 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 09:43:11,088 INFO L410 AbstractCegarLoop]: === Iteration 14 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2019-11-20 09:43:11,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 09:43:11,088 INFO L82 PathProgramCache]: Analyzing trace with hash -1867118562, now seen corresponding path program 2 times [2019-11-20 09:43:11,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 09:43:11,088 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [644441446] [2019-11-20 09:43:11,088 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 09:43:11,316 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-20 09:43:11,316 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-20 09:43:11,319 INFO L255 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 25 conjunts are in the unsatisfiable core [2019-11-20 09:43:11,321 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 09:43:11,551 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 09:43:11,551 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:43:11,596 INFO L567 ElimStorePlain]: treesize reduction 6, result has 81.3 percent of original size [2019-11-20 09:43:11,596 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 09:43:11,596 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:26 [2019-11-20 09:43:12,002 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-20 09:43:12,005 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:43:12,005 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 09:43:12,006 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:43:12,015 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:43:12,017 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 09:43:12,018 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:30, output treesize:5 [2019-11-20 09:43:12,061 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 09:43:12,061 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 09:43:12,626 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 09:43:12,636 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 09:43:12,637 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-11-20 09:43:12,639 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:43:12,639 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:43:12,650 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:43:12,651 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:43:12,651 INFO L221 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:27, output treesize:16 [2019-11-20 09:43:13,608 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 09:43:13,608 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [644441446] [2019-11-20 09:43:13,609 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 09:43:13,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 29 [2019-11-20 09:43:13,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590571012] [2019-11-20 09:43:13,609 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-20 09:43:13,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 09:43:13,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-20 09:43:13,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=728, Unknown=0, NotChecked=0, Total=812 [2019-11-20 09:43:13,610 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 29 states. [2019-11-20 09:43:14,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 09:43:14,994 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2019-11-20 09:43:14,995 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-20 09:43:14,995 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 33 [2019-11-20 09:43:14,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 09:43:14,996 INFO L225 Difference]: With dead ends: 54 [2019-11-20 09:43:14,996 INFO L226 Difference]: Without dead ends: 41 [2019-11-20 09:43:14,996 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=131, Invalid=1059, Unknown=0, NotChecked=0, Total=1190 [2019-11-20 09:43:14,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-11-20 09:43:14,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2019-11-20 09:43:14,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-11-20 09:43:15,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2019-11-20 09:43:15,000 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 33 [2019-11-20 09:43:15,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 09:43:15,000 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2019-11-20 09:43:15,000 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-20 09:43:15,000 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2019-11-20 09:43:15,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-11-20 09:43:15,001 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 09:43:15,002 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 09:43:15,202 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 09:43:15,202 INFO L410 AbstractCegarLoop]: === Iteration 15 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2019-11-20 09:43:15,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 09:43:15,203 INFO L82 PathProgramCache]: Analyzing trace with hash 545438971, now seen corresponding path program 3 times [2019-11-20 09:43:15,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-20 09:43:15,203 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [228618219] [2019-11-20 09:43:15,203 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/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 09:43:15,482 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-20 09:43:15,483 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-20 09:43:15,484 INFO L255 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-20 09:43:15,486 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 09:43:15,503 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 09:43:15,504 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:43:15,517 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:43:15,517 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:43:15,517 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:14, output treesize:13 [2019-11-20 09:43:15,547 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 09:43:15,547 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 09:43:15,576 INFO L567 ElimStorePlain]: treesize reduction 16, result has 54.3 percent of original size [2019-11-20 09:43:15,577 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:43:15,577 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:39, output treesize:19 [2019-11-20 09:43:15,684 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:43:15,685 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 09:43:15,685 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 09:43:15,686 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 09:43:15,687 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 09:43:15,757 INFO L567 ElimStorePlain]: treesize reduction 6, result has 84.6 percent of original size [2019-11-20 09:43:15,758 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 09:43:15,758 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 09:43:15,758 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:42, output treesize:33 [2019-11-20 09:43:15,758 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 09:43:15,842 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 09:43:16,483 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-11-20 09:43:16,483 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-20 09:43:17,200 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-11-20 09:43:19,668 WARN L191 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 28 [2019-11-20 09:43:42,183 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 09:43:42,262 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 09:43:42,263 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2019-11-20 09:43:42,400 WARN L191 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 23 [2019-11-20 09:43:42,400 INFO L567 ElimStorePlain]: treesize reduction 17, result has 69.1 percent of original size [2019-11-20 09:43:42,401 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:43:42,739 WARN L191 SmtUtils]: Spent 337.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 44 [2019-11-20 09:43:42,739 INFO L567 ElimStorePlain]: treesize reduction 10, result has 90.7 percent of original size [2019-11-20 09:43:42,773 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 09:43:42,805 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 09:43:42,806 INFO L496 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2019-11-20 09:43:42,933 WARN L191 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 27 [2019-11-20 09:43:42,934 INFO L567 ElimStorePlain]: treesize reduction 7, result has 87.3 percent of original size [2019-11-20 09:43:42,934 INFO L496 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-20 09:43:43,091 WARN L191 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2019-11-20 09:43:43,091 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 09:43:43,092 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 09:43:43,092 INFO L221 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:117, output treesize:87 [2019-11-20 09:43:43,755 WARN L191 SmtUtils]: Spent 195.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2019-11-20 09:43:43,857 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-11-20 09:43:43,857 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [228618219] [2019-11-20 09:43:43,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 09:43:43,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 18 [2019-11-20 09:43:43,858 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596999386] [2019-11-20 09:43:43,858 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-20 09:43:43,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-20 09:43:43,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-20 09:43:43,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=293, Unknown=3, NotChecked=0, Total=342 [2019-11-20 09:43:43,859 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand 19 states. [2019-11-20 09:43:48,439 WARN L191 SmtUtils]: Spent 4.16 s on a formula simplification. DAG size of input: 55 DAG size of output: 37 [2019-11-20 09:43:53,109 WARN L191 SmtUtils]: Spent 4.23 s on a formula simplification. DAG size of input: 54 DAG size of output: 36 [2019-11-20 09:44:03,389 WARN L191 SmtUtils]: Spent 9.73 s on a formula simplification. DAG size of input: 74 DAG size of output: 51 [2019-11-20 09:44:13,231 WARN L191 SmtUtils]: Spent 9.28 s on a formula simplification. DAG size of input: 84 DAG size of output: 61 [2019-11-20 09:44:26,855 WARN L191 SmtUtils]: Spent 9.19 s on a formula simplification. DAG size of input: 76 DAG size of output: 53 [2019-11-20 09:44:31,666 WARN L191 SmtUtils]: Spent 4.25 s on a formula simplification. DAG size of input: 56 DAG size of output: 38 [2019-11-20 09:44:42,439 WARN L191 SmtUtils]: Spent 9.26 s on a formula simplification. DAG size of input: 82 DAG size of output: 59 [2019-11-20 09:44:52,721 WARN L191 SmtUtils]: Spent 9.34 s on a formula simplification. DAG size of input: 92 DAG size of output: 69 [2019-11-20 09:45:06,817 WARN L191 SmtUtils]: Spent 9.33 s on a formula simplification. DAG size of input: 84 DAG size of output: 61 [2019-11-20 09:45:07,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 09:45:07,072 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2019-11-20 09:45:07,082 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-20 09:45:07,082 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 37 [2019-11-20 09:45:07,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 09:45:07,083 INFO L225 Difference]: With dead ends: 37 [2019-11-20 09:45:07,083 INFO L226 Difference]: Without dead ends: 0 [2019-11-20 09:45:07,083 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 47 SyntacticMatches, 9 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 106.8s TimeCoverageRelationStatistics Valid=149, Invalid=601, Unknown=6, NotChecked=0, Total=756 [2019-11-20 09:45:07,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-11-20 09:45:07,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-11-20 09:45:07,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-11-20 09:45:07,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-11-20 09:45:07,084 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 37 [2019-11-20 09:45:07,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 09:45:07,085 INFO L462 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-11-20 09:45:07,085 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-20 09:45:07,085 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-11-20 09:45:07,085 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-11-20 09:45:07,285 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-20 09:45:07,291 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.11 09:45:07 BoogieIcfgContainer [2019-11-20 09:45:07,291 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-20 09:45:07,292 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-20 09:45:07,292 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-20 09:45:07,293 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-20 09:45:07,293 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 09:42:07" (3/4) ... [2019-11-20 09:45:07,296 INFO L137 WitnessPrinter]: Generating witness for correct program [2019-11-20 09:45:07,302 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2019-11-20 09:45:07,303 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_32 [2019-11-20 09:45:07,303 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_64 [2019-11-20 09:45:07,303 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint16_identity [2019-11-20 09:45:07,303 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint64_identity [2019-11-20 09:45:07,303 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2019-11-20 09:45:07,303 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure strlen_rec [2019-11-20 09:45:07,303 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint32_identity [2019-11-20 09:45:07,308 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 11 nodes and edges [2019-11-20 09:45:07,308 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2019-11-20 09:45:07,309 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2019-11-20 09:45:07,309 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2019-11-20 09:45:07,353 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_01b04bb5-039c-4573-bd2f-da55c5a49afc/bin/uautomizer/witness.graphml [2019-11-20 09:45:07,354 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-20 09:45:07,355 INFO L168 Benchmark]: Toolchain (without parser) took 180953.97 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 184.5 MB). Free memory was 940.7 MB in the beginning and 847.1 MB in the end (delta: 93.6 MB). Peak memory consumption was 278.2 MB. Max. memory is 11.5 GB. [2019-11-20 09:45:07,356 INFO L168 Benchmark]: CDTParser took 0.73 ms. Allocated memory is still 1.0 GB. Free memory is still 962.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-20 09:45:07,356 INFO L168 Benchmark]: CACSL2BoogieTranslator took 527.05 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 132.6 MB). Free memory was 940.7 MB in the beginning and 1.1 GB in the end (delta: -175.9 MB). Peak memory consumption was 17.9 MB. Max. memory is 11.5 GB. [2019-11-20 09:45:07,357 INFO L168 Benchmark]: Boogie Preprocessor took 56.83 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: 6.7 MB). Peak memory consumption was 6.7 MB. Max. memory is 11.5 GB. [2019-11-20 09:45:07,357 INFO L168 Benchmark]: RCFGBuilder took 502.13 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: 43.9 MB). Peak memory consumption was 43.9 MB. Max. memory is 11.5 GB. [2019-11-20 09:45:07,358 INFO L168 Benchmark]: TraceAbstraction took 179802.21 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 51.9 MB). Free memory was 1.1 GB in the beginning and 855.8 MB in the end (delta: 210.2 MB). Peak memory consumption was 262.1 MB. Max. memory is 11.5 GB. [2019-11-20 09:45:07,358 INFO L168 Benchmark]: Witness Printer took 61.65 ms. Allocated memory is still 1.2 GB. Free memory was 855.8 MB in the beginning and 847.1 MB in the end (delta: 8.7 MB). Peak memory consumption was 8.7 MB. Max. memory is 11.5 GB. [2019-11-20 09:45:07,360 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.73 ms. Allocated memory is still 1.0 GB. Free memory is still 962.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 527.05 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 132.6 MB). Free memory was 940.7 MB in the beginning and 1.1 GB in the end (delta: -175.9 MB). Peak memory consumption was 17.9 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 56.83 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: 6.7 MB). Peak memory consumption was 6.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 502.13 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: 43.9 MB). Peak memory consumption was 43.9 MB. Max. memory is 11.5 GB. * TraceAbstraction took 179802.21 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 51.9 MB). Free memory was 1.1 GB in the beginning and 855.8 MB in the end (delta: 210.2 MB). Peak memory consumption was 262.1 MB. Max. memory is 11.5 GB. * Witness Printer took 61.65 ms. Allocated memory is still 1.2 GB. Free memory was 855.8 MB in the beginning and 847.1 MB in the end (delta: 8.7 MB). Peak memory consumption was 8.7 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - 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 - PositiveResult [Line: 515]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 515]: 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, 48 locations, 7 error locations. Result: SAFE, OverallTime: 179.7s, OverallIterations: 15, TraceHistogramMax: 5, AutomataDifference: 101.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 319 SDtfs, 541 SDslu, 1376 SDs, 0 SdLazy, 1627 SolverSat, 165 SolverUnsat, 2 SolverUnknown, 0 SolverNotchecked, 12.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 613 GetRequests, 357 SyntacticMatches, 34 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 816 ImplicationChecksByTransitivity, 157.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=66occurred 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: 0.1s AutomataMinimizationTime, 15 MinimizatonAttempts, 82 StatesRemovedByMinimization, 12 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.8s SatisfiabilityAnalysisTime, 72.0s InterpolantComputationTime, 282 NumberOfCodeBlocks, 282 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 534 ConstructedInterpolants, 57 QuantifiedInterpolants, 209671 SizeOfPredicates, 100 NumberOfNonLiveVariables, 901 ConjunctsInSsa, 191 ConjunctsInUnsatCore, 30 InterpolantComputations, 16 PerfectInterpolantSequences, 151/264 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...