./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ldv-consumption/32_7a_cilled_linux-3.8-rc1-drivers--block--paride--pt.ko-main.cil.out.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-consumption/32_7a_cilled_linux-3.8-rc1-drivers--block--paride--pt.ko-main.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 3b154baf348652a9aadd484f41053a90df6581eb3d7346fd488d4cc05040e74b --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 23:33:39,783 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 23:33:39,786 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 23:33:39,833 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 23:33:39,833 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 23:33:39,835 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 23:33:39,836 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 23:33:39,839 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 23:33:39,841 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 23:33:39,842 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 23:33:39,843 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 23:33:39,844 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 23:33:39,845 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 23:33:39,846 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 23:33:39,848 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 23:33:39,849 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 23:33:39,850 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 23:33:39,852 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 23:33:39,854 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 23:33:39,856 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 23:33:39,858 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 23:33:39,860 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 23:33:39,861 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 23:33:39,862 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 23:33:39,867 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 23:33:39,867 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 23:33:39,867 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 23:33:39,869 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 23:33:39,869 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 23:33:39,870 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 23:33:39,871 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 23:33:39,872 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 23:33:39,873 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 23:33:39,879 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 23:33:39,880 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 23:33:39,880 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 23:33:39,881 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 23:33:39,881 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 23:33:39,882 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 23:33:39,883 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 23:33:39,884 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 23:33:39,885 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-12 23:33:39,913 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 23:33:39,914 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 23:33:39,914 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 23:33:39,914 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 23:33:39,915 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 23:33:39,915 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 23:33:39,915 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 23:33:39,915 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 23:33:39,916 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 23:33:39,916 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 23:33:39,916 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 23:33:39,916 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 23:33:39,916 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 23:33:39,917 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 23:33:39,917 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 23:33:39,917 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 23:33:39,918 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 23:33:39,918 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 23:33:39,918 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 23:33:39,918 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 23:33:39,918 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 23:33:39,919 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 23:33:39,919 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 23:33:39,919 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 23:33:39,919 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 23:33:39,919 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 23:33:39,920 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 23:33:39,920 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 23:33:39,920 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:33:39,920 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 23:33:39,921 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 23:33:39,921 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 23:33:39,921 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 23:33:39,921 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 23:33:39,921 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 23:33:39,922 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 23:33:39,922 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 23:33:39,922 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3b154baf348652a9aadd484f41053a90df6581eb3d7346fd488d4cc05040e74b [2021-11-12 23:33:40,167 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 23:33:40,187 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 23:33:40,189 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 23:33:40,190 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 23:33:40,191 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 23:33:40,192 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/ldv-consumption/32_7a_cilled_linux-3.8-rc1-drivers--block--paride--pt.ko-main.cil.out.i [2021-11-12 23:33:40,263 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/data/c6a879655/ce5bbfa88b5a422788936dbfe964a202/FLAGa3939bf8a [2021-11-12 23:33:40,941 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 23:33:40,942 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/sv-benchmarks/c/ldv-consumption/32_7a_cilled_linux-3.8-rc1-drivers--block--paride--pt.ko-main.cil.out.i [2021-11-12 23:33:40,971 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/data/c6a879655/ce5bbfa88b5a422788936dbfe964a202/FLAGa3939bf8a [2021-11-12 23:33:41,064 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/data/c6a879655/ce5bbfa88b5a422788936dbfe964a202 [2021-11-12 23:33:41,068 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 23:33:41,072 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 23:33:41,073 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 23:33:41,074 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 23:33:41,078 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 23:33:41,079 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:33:41" (1/1) ... [2021-11-12 23:33:41,082 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78401ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:33:41, skipping insertion in model container [2021-11-12 23:33:41,082 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:33:41" (1/1) ... [2021-11-12 23:33:41,089 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 23:33:41,186 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 23:33:42,110 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/sv-benchmarks/c/ldv-consumption/32_7a_cilled_linux-3.8-rc1-drivers--block--paride--pt.ko-main.cil.out.i[119285,119298] [2021-11-12 23:33:42,199 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:33:42,219 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-11-12 23:33:42,219 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@2bee7852 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:33:42, skipping insertion in model container [2021-11-12 23:33:42,220 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 23:33:42,220 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-12 23:33:42,222 INFO L158 Benchmark]: Toolchain (without parser) took 1148.45ms. Allocated memory was 86.0MB in the beginning and 113.2MB in the end (delta: 27.3MB). Free memory was 59.4MB in the beginning and 53.6MB in the end (delta: 5.8MB). Peak memory consumption was 33.3MB. Max. memory is 16.1GB. [2021-11-12 23:33:42,223 INFO L158 Benchmark]: CDTParser took 0.11ms. Allocated memory is still 86.0MB. Free memory was 63.8MB in the beginning and 63.8MB in the end (delta: 36.8kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-12 23:33:42,224 INFO L158 Benchmark]: CACSL2BoogieTranslator took 1146.40ms. Allocated memory was 86.0MB in the beginning and 113.2MB in the end (delta: 27.3MB). Free memory was 59.2MB in the beginning and 53.6MB in the end (delta: 5.6MB). Peak memory consumption was 33.3MB. Max. memory is 16.1GB. [2021-11-12 23:33:42,225 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11ms. Allocated memory is still 86.0MB. Free memory was 63.8MB in the beginning and 63.8MB in the end (delta: 36.8kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 1146.40ms. Allocated memory was 86.0MB in the beginning and 113.2MB in the end (delta: 27.3MB). Free memory was 59.2MB in the beginning and 53.6MB in the end (delta: 5.6MB). Peak memory consumption was 33.3MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 3832]: Unsupported Syntax Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-consumption/32_7a_cilled_linux-3.8-rc1-drivers--block--paride--pt.ko-main.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-64bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 3b154baf348652a9aadd484f41053a90df6581eb3d7346fd488d4cc05040e74b --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 23:33:44,297 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 23:33:44,301 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 23:33:44,355 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 23:33:44,356 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 23:33:44,361 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 23:33:44,362 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 23:33:44,367 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 23:33:44,370 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 23:33:44,377 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 23:33:44,378 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 23:33:44,380 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 23:33:44,381 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 23:33:44,383 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 23:33:44,385 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 23:33:44,390 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 23:33:44,392 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 23:33:44,393 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 23:33:44,395 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 23:33:44,401 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 23:33:44,403 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 23:33:44,404 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 23:33:44,410 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 23:33:44,412 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 23:33:44,418 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 23:33:44,418 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 23:33:44,419 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 23:33:44,421 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 23:33:44,421 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 23:33:44,422 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 23:33:44,423 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 23:33:44,423 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 23:33:44,425 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 23:33:44,426 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 23:33:44,427 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 23:33:44,427 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 23:33:44,428 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 23:33:44,443 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 23:33:44,443 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 23:33:44,445 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 23:33:44,445 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 23:33:44,447 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-64bit-Taipan_Bitvector.epf [2021-11-12 23:33:44,489 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 23:33:44,489 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 23:33:44,491 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 23:33:44,491 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 23:33:44,491 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 23:33:44,491 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 23:33:44,491 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 23:33:44,492 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 23:33:44,492 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 23:33:44,492 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 23:33:44,494 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 23:33:44,494 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 23:33:44,495 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 23:33:44,495 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 23:33:44,495 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 23:33:44,495 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 23:33:44,495 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-12 23:33:44,495 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-12 23:33:44,496 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 23:33:44,496 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 23:33:44,496 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 23:33:44,496 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 23:33:44,496 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-12 23:33:44,497 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 23:33:44,497 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:33:44,497 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 23:33:44,497 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 23:33:44,497 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 23:33:44,498 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-12 23:33:44,498 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-12 23:33:44,498 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 23:33:44,498 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 23:33:44,498 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 23:33:44,499 INFO L138 SettingsManager]: * Logic for external solver=AUFBV WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3b154baf348652a9aadd484f41053a90df6581eb3d7346fd488d4cc05040e74b [2021-11-12 23:33:44,855 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 23:33:44,885 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 23:33:44,887 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 23:33:44,889 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 23:33:44,890 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 23:33:44,891 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/ldv-consumption/32_7a_cilled_linux-3.8-rc1-drivers--block--paride--pt.ko-main.cil.out.i [2021-11-12 23:33:44,980 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/data/862e03de0/c3efb736be4e45c39bb48888d6345a10/FLAG68562f477 [2021-11-12 23:33:45,807 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 23:33:45,812 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/sv-benchmarks/c/ldv-consumption/32_7a_cilled_linux-3.8-rc1-drivers--block--paride--pt.ko-main.cil.out.i [2021-11-12 23:33:45,852 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/data/862e03de0/c3efb736be4e45c39bb48888d6345a10/FLAG68562f477 [2021-11-12 23:33:45,896 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/data/862e03de0/c3efb736be4e45c39bb48888d6345a10 [2021-11-12 23:33:45,900 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 23:33:45,902 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 23:33:45,905 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 23:33:45,905 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 23:33:45,910 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 23:33:45,911 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:33:45" (1/1) ... [2021-11-12 23:33:45,912 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@63506d29 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:33:45, skipping insertion in model container [2021-11-12 23:33:45,913 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:33:45" (1/1) ... [2021-11-12 23:33:45,920 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 23:33:46,023 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 23:33:46,970 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/sv-benchmarks/c/ldv-consumption/32_7a_cilled_linux-3.8-rc1-drivers--block--paride--pt.ko-main.cil.out.i[119285,119298] [2021-11-12 23:33:47,035 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:33:47,057 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-12 23:33:47,085 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 23:33:47,368 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/sv-benchmarks/c/ldv-consumption/32_7a_cilled_linux-3.8-rc1-drivers--block--paride--pt.ko-main.cil.out.i[119285,119298] [2021-11-12 23:33:47,385 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:33:47,429 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 23:33:47,599 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/sv-benchmarks/c/ldv-consumption/32_7a_cilled_linux-3.8-rc1-drivers--block--paride--pt.ko-main.cil.out.i[119285,119298] [2021-11-12 23:33:47,608 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:33:47,665 INFO L208 MainTranslator]: Completed translation [2021-11-12 23:33:47,665 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:33:47 WrapperNode [2021-11-12 23:33:47,666 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 23:33:47,667 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 23:33:47,667 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 23:33:47,667 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 23:33:47,674 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:33:47" (1/1) ... [2021-11-12 23:33:47,743 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:33:47" (1/1) ... [2021-11-12 23:33:47,854 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 23:33:47,855 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 23:33:47,855 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 23:33:47,855 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 23:33:47,863 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:33:47" (1/1) ... [2021-11-12 23:33:47,864 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:33:47" (1/1) ... [2021-11-12 23:33:47,894 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:33:47" (1/1) ... [2021-11-12 23:33:47,895 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:33:47" (1/1) ... [2021-11-12 23:33:48,008 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:33:47" (1/1) ... [2021-11-12 23:33:48,027 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:33:47" (1/1) ... [2021-11-12 23:33:48,053 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:33:47" (1/1) ... [2021-11-12 23:33:48,073 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 23:33:48,077 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 23:33:48,077 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 23:33:48,078 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 23:33:48,079 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:33:47" (1/1) ... [2021-11-12 23:33:48,088 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:33:48,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:33:48,112 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 23:33:48,140 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 23:33:48,156 INFO L130 BoogieDeclarations]: Found specification of procedure pi_release [2021-11-12 23:33:48,156 INFO L138 BoogieDeclarations]: Found implementation of procedure pi_release [2021-11-12 23:33:48,156 INFO L130 BoogieDeclarations]: Found specification of procedure write_reg [2021-11-12 23:33:48,156 INFO L138 BoogieDeclarations]: Found implementation of procedure write_reg [2021-11-12 23:33:48,156 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-11-12 23:33:48,157 INFO L130 BoogieDeclarations]: Found specification of procedure pi_disconnect [2021-11-12 23:33:48,157 INFO L138 BoogieDeclarations]: Found implementation of procedure pi_disconnect [2021-11-12 23:33:48,157 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_lock_pt_mutex [2021-11-12 23:33:48,157 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_lock_pt_mutex [2021-11-12 23:33:48,157 INFO L130 BoogieDeclarations]: Found specification of procedure status_reg [2021-11-12 23:33:48,157 INFO L138 BoogieDeclarations]: Found implementation of procedure status_reg [2021-11-12 23:33:48,157 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-12 23:33:48,157 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE2 [2021-11-12 23:33:48,158 INFO L130 BoogieDeclarations]: Found specification of procedure pi_read_block [2021-11-12 23:33:48,158 INFO L138 BoogieDeclarations]: Found implementation of procedure pi_read_block [2021-11-12 23:33:48,158 INFO L130 BoogieDeclarations]: Found specification of procedure read_reg [2021-11-12 23:33:48,158 INFO L138 BoogieDeclarations]: Found implementation of procedure read_reg [2021-11-12 23:33:48,158 INFO L130 BoogieDeclarations]: Found specification of procedure pt_media_access_cmd [2021-11-12 23:33:48,158 INFO L138 BoogieDeclarations]: Found implementation of procedure pt_media_access_cmd [2021-11-12 23:33:48,158 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2021-11-12 23:33:48,158 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2021-11-12 23:33:48,159 INFO L130 BoogieDeclarations]: Found specification of procedure pt_reset [2021-11-12 23:33:48,159 INFO L138 BoogieDeclarations]: Found implementation of procedure pt_reset [2021-11-12 23:33:48,159 INFO L130 BoogieDeclarations]: Found specification of procedure pt_identify [2021-11-12 23:33:48,159 INFO L138 BoogieDeclarations]: Found implementation of procedure pt_identify [2021-11-12 23:33:48,159 INFO L130 BoogieDeclarations]: Found specification of procedure pt_command [2021-11-12 23:33:48,159 INFO L138 BoogieDeclarations]: Found implementation of procedure pt_command [2021-11-12 23:33:48,159 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_unlock [2021-11-12 23:33:48,159 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_unlock [2021-11-12 23:33:48,160 INFO L130 BoogieDeclarations]: Found specification of procedure pt_write [2021-11-12 23:33:48,160 INFO L138 BoogieDeclarations]: Found implementation of procedure pt_write [2021-11-12 23:33:48,160 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_error [2021-11-12 23:33:48,160 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_error [2021-11-12 23:33:48,160 INFO L130 BoogieDeclarations]: Found specification of procedure ldv__builtin_expect [2021-11-12 23:33:48,160 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv__builtin_expect [2021-11-12 23:33:48,161 INFO L130 BoogieDeclarations]: Found specification of procedure pt_atapi [2021-11-12 23:33:48,161 INFO L138 BoogieDeclarations]: Found implementation of procedure pt_atapi [2021-11-12 23:33:48,161 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-12 23:33:48,161 INFO L130 BoogieDeclarations]: Found specification of procedure pt_poll_dsc [2021-11-12 23:33:48,161 INFO L138 BoogieDeclarations]: Found implementation of procedure pt_poll_dsc [2021-11-12 23:33:48,161 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_mutex_unlock_pt_mutex [2021-11-12 23:33:48,162 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_mutex_unlock_pt_mutex [2021-11-12 23:33:48,162 INFO L130 BoogieDeclarations]: Found specification of procedure mutex_lock [2021-11-12 23:33:48,162 INFO L138 BoogieDeclarations]: Found implementation of procedure mutex_lock [2021-11-12 23:33:48,162 INFO L130 BoogieDeclarations]: Found specification of procedure pt_req_sense [2021-11-12 23:33:48,162 INFO L138 BoogieDeclarations]: Found implementation of procedure pt_req_sense [2021-11-12 23:33:48,162 INFO L130 BoogieDeclarations]: Found specification of procedure copy_from_user [2021-11-12 23:33:48,162 INFO L138 BoogieDeclarations]: Found implementation of procedure copy_from_user [2021-11-12 23:33:48,162 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_unregister_chrdev_17 [2021-11-12 23:33:48,163 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_unregister_chrdev_17 [2021-11-12 23:33:48,163 INFO L130 BoogieDeclarations]: Found specification of procedure atomic_inc [2021-11-12 23:33:48,163 INFO L138 BoogieDeclarations]: Found implementation of procedure atomic_inc [2021-11-12 23:33:48,164 INFO L130 BoogieDeclarations]: Found specification of procedure __const_udelay [2021-11-12 23:33:48,164 INFO L138 BoogieDeclarations]: Found implementation of procedure __const_udelay [2021-11-12 23:33:48,165 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-12 23:33:48,165 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 23:33:48,165 INFO L130 BoogieDeclarations]: Found specification of procedure DRIVE [2021-11-12 23:33:48,165 INFO L138 BoogieDeclarations]: Found implementation of procedure DRIVE [2021-11-12 23:33:48,166 INFO L130 BoogieDeclarations]: Found specification of procedure pt_completion [2021-11-12 23:33:48,166 INFO L138 BoogieDeclarations]: Found implementation of procedure pt_completion [2021-11-12 23:33:48,166 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-12 23:33:48,166 INFO L130 BoogieDeclarations]: Found specification of procedure pt_sleep [2021-11-12 23:33:48,166 INFO L138 BoogieDeclarations]: Found implementation of procedure pt_sleep [2021-11-12 23:33:48,166 INFO L130 BoogieDeclarations]: Found specification of procedure pt_write_fm [2021-11-12 23:33:48,166 INFO L138 BoogieDeclarations]: Found implementation of procedure pt_write_fm [2021-11-12 23:33:48,167 INFO L130 BoogieDeclarations]: Found specification of procedure iminor [2021-11-12 23:33:48,167 INFO L138 BoogieDeclarations]: Found implementation of procedure iminor [2021-11-12 23:33:48,167 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-11-12 23:33:48,167 INFO L130 BoogieDeclarations]: Found specification of procedure pi_write_block [2021-11-12 23:33:48,168 INFO L138 BoogieDeclarations]: Found implementation of procedure pi_write_block [2021-11-12 23:33:48,168 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-12 23:33:48,168 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-12 23:33:48,168 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-12 23:33:48,168 INFO L130 BoogieDeclarations]: Found specification of procedure pi_init [2021-11-12 23:33:48,168 INFO L138 BoogieDeclarations]: Found implementation of procedure pi_init [2021-11-12 23:33:48,168 INFO L130 BoogieDeclarations]: Found specification of procedure pi_read_regr [2021-11-12 23:33:48,169 INFO L138 BoogieDeclarations]: Found implementation of procedure pi_read_regr [2021-11-12 23:33:48,169 INFO L130 BoogieDeclarations]: Found specification of procedure might_fault [2021-11-12 23:33:48,169 INFO L138 BoogieDeclarations]: Found implementation of procedure might_fault [2021-11-12 23:33:48,169 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-12 23:33:48,169 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE4 [2021-11-12 23:33:48,169 INFO L130 BoogieDeclarations]: Found specification of procedure pt_wait [2021-11-12 23:33:48,169 INFO L138 BoogieDeclarations]: Found implementation of procedure pt_wait [2021-11-12 23:33:48,170 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE8 [2021-11-12 23:33:48,170 INFO L130 BoogieDeclarations]: Found specification of procedure pi_connect [2021-11-12 23:33:48,170 INFO L138 BoogieDeclarations]: Found implementation of procedure pi_connect [2021-11-12 23:33:48,170 INFO L130 BoogieDeclarations]: Found specification of procedure device_destroy [2021-11-12 23:33:48,171 INFO L138 BoogieDeclarations]: Found implementation of procedure device_destroy [2021-11-12 23:33:48,171 INFO L130 BoogieDeclarations]: Found specification of procedure pt_probe [2021-11-12 23:33:48,171 INFO L138 BoogieDeclarations]: Found implementation of procedure pt_probe [2021-11-12 23:33:48,171 INFO L130 BoogieDeclarations]: Found specification of procedure pt_rewind [2021-11-12 23:33:48,172 INFO L138 BoogieDeclarations]: Found implementation of procedure pt_rewind [2021-11-12 23:33:48,172 INFO L130 BoogieDeclarations]: Found specification of procedure xn [2021-11-12 23:33:48,172 INFO L138 BoogieDeclarations]: Found implementation of procedure xn [2021-11-12 23:33:48,172 INFO L130 BoogieDeclarations]: Found specification of procedure _copy_from_user [2021-11-12 23:33:48,173 INFO L138 BoogieDeclarations]: Found implementation of procedure _copy_from_user [2021-11-12 23:33:48,173 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 23:33:48,173 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 23:33:48,173 INFO L130 BoogieDeclarations]: Found specification of procedure xs [2021-11-12 23:33:48,174 INFO L138 BoogieDeclarations]: Found implementation of procedure xs [2021-11-12 23:34:18,947 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 23:34:18,947 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-12 23:34:18,950 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:34:18 BoogieIcfgContainer [2021-11-12 23:34:18,951 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 23:34:18,952 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 23:34:18,952 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 23:34:18,955 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 23:34:18,956 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 11:33:45" (1/3) ... [2021-11-12 23:34:18,956 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37cb19de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:34:18, skipping insertion in model container [2021-11-12 23:34:18,957 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:33:47" (2/3) ... [2021-11-12 23:34:18,957 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37cb19de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:34:18, skipping insertion in model container [2021-11-12 23:34:18,957 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:34:18" (3/3) ... [2021-11-12 23:34:18,959 INFO L111 eAbstractionObserver]: Analyzing ICFG 32_7a_cilled_linux-3.8-rc1-drivers--block--paride--pt.ko-main.cil.out.i [2021-11-12 23:34:18,964 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 23:34:18,964 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-12 23:34:19,030 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 23:34:19,037 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-12 23:34:19,037 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-12 23:34:19,072 INFO L276 IsEmpty]: Start isEmpty. Operand has 674 states, 467 states have (on average 1.3533190578158458) internal successors, (632), 489 states have internal predecessors, (632), 167 states have call successors, (167), 42 states have call predecessors, (167), 42 states have return successors, (167), 167 states have call predecessors, (167), 167 states have call successors, (167) [2021-11-12 23:34:19,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-12 23:34:19,080 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:19,081 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:34:19,082 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:19,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:19,086 INFO L85 PathProgramCache]: Analyzing trace with hash 334168328, now seen corresponding path program 1 times [2021-11-12 23:34:19,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:34:19,102 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [327905502] [2021-11-12 23:34:19,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:19,103 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:34:19,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:34:19,105 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:34:19,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-12 23:34:20,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:20,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:34:20,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:20,709 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:20,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:20,922 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:20,923 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:34:20,923 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [327905502] [2021-11-12 23:34:20,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [327905502] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:34:20,924 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:34:20,924 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-12 23:34:20,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139206894] [2021-11-12 23:34:20,927 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:20,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:34:20,931 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:34:20,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:34:20,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:34:20,963 INFO L87 Difference]: Start difference. First operand has 674 states, 467 states have (on average 1.3533190578158458) internal successors, (632), 489 states have internal predecessors, (632), 167 states have call successors, (167), 42 states have call predecessors, (167), 42 states have return successors, (167), 167 states have call predecessors, (167), 167 states have call successors, (167) Second operand has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 1 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 23:34:23,350 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:34:23,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:23,586 INFO L93 Difference]: Finished difference Result 1645 states and 2392 transitions. [2021-11-12 23:34:23,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:34:23,589 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 1 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2021-11-12 23:34:23,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:23,649 INFO L225 Difference]: With dead ends: 1645 [2021-11-12 23:34:23,649 INFO L226 Difference]: Without dead ends: 966 [2021-11-12 23:34:23,659 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:34:23,663 INFO L933 BasicCegarLoop]: 1197 mSDtfsCounter, 439 mSDsluCounter, 894 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2350.49ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 439 SdHoareTripleChecker+Valid, 2091 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 21.52ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2433.89ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:23,664 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [439 Valid, 2091 Invalid, 25 Unknown, 0 Unchecked, 21.52ms Time], IncrementalHoareTripleChecker [4 Valid, 20 Invalid, 1 Unknown, 0 Unchecked, 2433.89ms Time] [2021-11-12 23:34:23,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 966 states. [2021-11-12 23:34:23,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 966 to 938. [2021-11-12 23:34:23,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 938 states, 645 states have (on average 1.3472868217054264) internal successors, (869), 667 states have internal predecessors, (869), 228 states have call successors, (228), 65 states have call predecessors, (228), 64 states have return successors, (222), 222 states have call predecessors, (222), 222 states have call successors, (222) [2021-11-12 23:34:23,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 938 states to 938 states and 1319 transitions. [2021-11-12 23:34:23,841 INFO L78 Accepts]: Start accepts. Automaton has 938 states and 1319 transitions. Word has length 19 [2021-11-12 23:34:23,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:23,841 INFO L470 AbstractCegarLoop]: Abstraction has 938 states and 1319 transitions. [2021-11-12 23:34:23,842 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 1 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 23:34:23,842 INFO L276 IsEmpty]: Start isEmpty. Operand 938 states and 1319 transitions. [2021-11-12 23:34:23,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-12 23:34:23,846 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:23,847 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:34:23,873 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:24,070 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:34:24,070 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:24,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:24,071 INFO L85 PathProgramCache]: Analyzing trace with hash -720822466, now seen corresponding path program 1 times [2021-11-12 23:34:24,072 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:34:24,073 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [774838536] [2021-11-12 23:34:24,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:24,073 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:34:24,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:34:24,076 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:34:24,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-12 23:34:25,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:25,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 650 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:34:25,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:25,468 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:25,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:25,840 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:25,840 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:34:25,841 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [774838536] [2021-11-12 23:34:25,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [774838536] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:34:25,841 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:34:25,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-12 23:34:25,841 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241044151] [2021-11-12 23:34:25,842 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:25,843 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:34:25,843 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:34:25,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:34:25,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:34:25,844 INFO L87 Difference]: Start difference. First operand 938 states and 1319 transitions. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 2 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:34:25,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:25,974 INFO L93 Difference]: Finished difference Result 1873 states and 2635 transitions. [2021-11-12 23:34:25,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:34:25,975 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 2 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-12 23:34:25,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:25,986 INFO L225 Difference]: With dead ends: 1873 [2021-11-12 23:34:25,986 INFO L226 Difference]: Without dead ends: 938 [2021-11-12 23:34:25,991 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:34:25,997 INFO L933 BasicCegarLoop]: 927 mSDtfsCounter, 918 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.23ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 918 SdHoareTripleChecker+Valid, 927 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.62ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.27ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:25,997 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [918 Valid, 927 Invalid, 1 Unknown, 0 Unchecked, 5.62ms Time], IncrementalHoareTripleChecker [0 Valid, 1 Invalid, 0 Unknown, 0 Unchecked, 12.27ms Time] [2021-11-12 23:34:26,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 938 states. [2021-11-12 23:34:26,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 938 to 938. [2021-11-12 23:34:26,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 938 states, 645 states have (on average 1.344186046511628) internal successors, (867), 667 states have internal predecessors, (867), 228 states have call successors, (228), 65 states have call predecessors, (228), 64 states have return successors, (222), 222 states have call predecessors, (222), 222 states have call successors, (222) [2021-11-12 23:34:26,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 938 states to 938 states and 1317 transitions. [2021-11-12 23:34:26,086 INFO L78 Accepts]: Start accepts. Automaton has 938 states and 1317 transitions. Word has length 19 [2021-11-12 23:34:26,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:26,086 INFO L470 AbstractCegarLoop]: Abstraction has 938 states and 1317 transitions. [2021-11-12 23:34:26,086 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 2 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:34:26,087 INFO L276 IsEmpty]: Start isEmpty. Operand 938 states and 1317 transitions. [2021-11-12 23:34:26,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-12 23:34:26,092 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:26,092 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:34:26,121 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:26,314 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:34:26,315 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:26,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:26,316 INFO L85 PathProgramCache]: Analyzing trace with hash 569153980, now seen corresponding path program 1 times [2021-11-12 23:34:26,317 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:34:26,318 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [23556868] [2021-11-12 23:34:26,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:26,318 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:34:26,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:34:26,319 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:34:26,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-12 23:34:27,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:27,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 672 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:34:27,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:27,783 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:27,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:28,141 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:28,142 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:34:28,142 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [23556868] [2021-11-12 23:34:28,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [23556868] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:34:28,142 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:34:28,142 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-12 23:34:28,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722103654] [2021-11-12 23:34:28,143 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:28,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:34:28,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:34:28,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:34:28,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:34:28,144 INFO L87 Difference]: Start difference. First operand 938 states and 1317 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 23:34:30,252 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:34:34,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:34,829 INFO L93 Difference]: Finished difference Result 2939 states and 4147 transitions. [2021-11-12 23:34:34,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:34:34,830 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 25 [2021-11-12 23:34:34,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:34,846 INFO L225 Difference]: With dead ends: 2939 [2021-11-12 23:34:34,846 INFO L226 Difference]: Without dead ends: 2004 [2021-11-12 23:34:34,851 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:34:34,852 INFO L933 BasicCegarLoop]: 1793 mSDtfsCounter, 2141 mSDsluCounter, 1232 mSDsCounter, 0 mSdLazyCounter, 282 mSolverCounterSat, 299 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6137.65ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2141 SdHoareTripleChecker+Valid, 3025 SdHoareTripleChecker+Invalid, 582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 20.53ms SdHoareTripleChecker+Time, 299 IncrementalHoareTripleChecker+Valid, 282 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6490.90ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:34,853 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2141 Valid, 3025 Invalid, 582 Unknown, 0 Unchecked, 20.53ms Time], IncrementalHoareTripleChecker [299 Valid, 282 Invalid, 1 Unknown, 0 Unchecked, 6490.90ms Time] [2021-11-12 23:34:34,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2004 states. [2021-11-12 23:34:34,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2004 to 1996. [2021-11-12 23:34:34,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1996 states, 1373 states have (on average 1.3495994173343044) internal successors, (1853), 1411 states have internal predecessors, (1853), 486 states have call successors, (486), 137 states have call predecessors, (486), 136 states have return successors, (480), 480 states have call predecessors, (480), 480 states have call successors, (480) [2021-11-12 23:34:35,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1996 states to 1996 states and 2819 transitions. [2021-11-12 23:34:35,003 INFO L78 Accepts]: Start accepts. Automaton has 1996 states and 2819 transitions. Word has length 25 [2021-11-12 23:34:35,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:35,003 INFO L470 AbstractCegarLoop]: Abstraction has 1996 states and 2819 transitions. [2021-11-12 23:34:35,003 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 23:34:35,004 INFO L276 IsEmpty]: Start isEmpty. Operand 1996 states and 2819 transitions. [2021-11-12 23:34:35,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-12 23:34:35,005 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:35,005 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:34:35,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:35,228 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:34:35,228 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:35,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:35,229 INFO L85 PathProgramCache]: Analyzing trace with hash 491627987, now seen corresponding path program 1 times [2021-11-12 23:34:35,230 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:34:35,230 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1898170700] [2021-11-12 23:34:35,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:35,231 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:34:35,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:34:35,232 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:34:35,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-12 23:34:36,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:36,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 659 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:34:36,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:36,420 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:36,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:36,642 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:36,642 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:34:36,642 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1898170700] [2021-11-12 23:34:36,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1898170700] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:34:36,642 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:34:36,642 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-12 23:34:36,643 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779502886] [2021-11-12 23:34:36,643 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:36,643 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:34:36,643 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:34:36,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:34:36,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:34:36,644 INFO L87 Difference]: Start difference. First operand 1996 states and 2819 transitions. Second operand has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:34:38,711 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:34:39,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:39,006 INFO L93 Difference]: Finished difference Result 3995 states and 5643 transitions. [2021-11-12 23:34:39,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:34:39,013 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-12 23:34:39,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:39,028 INFO L225 Difference]: With dead ends: 3995 [2021-11-12 23:34:39,029 INFO L226 Difference]: Without dead ends: 2002 [2021-11-12 23:34:39,038 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:34:39,039 INFO L933 BasicCegarLoop]: 925 mSDtfsCounter, 5 mSDsluCounter, 921 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2211.34ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 1846 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.55ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2242.96ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:39,040 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 1846 Invalid, 9 Unknown, 0 Unchecked, 7.55ms Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 1 Unknown, 0 Unchecked, 2242.96ms Time] [2021-11-12 23:34:39,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2002 states. [2021-11-12 23:34:39,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2002 to 1998. [2021-11-12 23:34:39,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1998 states, 1375 states have (on average 1.3490909090909091) internal successors, (1855), 1413 states have internal predecessors, (1855), 486 states have call successors, (486), 137 states have call predecessors, (486), 136 states have return successors, (480), 480 states have call predecessors, (480), 480 states have call successors, (480) [2021-11-12 23:34:39,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1998 states to 1998 states and 2821 transitions. [2021-11-12 23:34:39,170 INFO L78 Accepts]: Start accepts. Automaton has 1998 states and 2821 transitions. Word has length 24 [2021-11-12 23:34:39,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:39,170 INFO L470 AbstractCegarLoop]: Abstraction has 1998 states and 2821 transitions. [2021-11-12 23:34:39,170 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:34:39,171 INFO L276 IsEmpty]: Start isEmpty. Operand 1998 states and 2821 transitions. [2021-11-12 23:34:39,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-12 23:34:39,172 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:39,172 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:34:39,201 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:39,393 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:34:39,394 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:39,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:39,394 INFO L85 PathProgramCache]: Analyzing trace with hash 402915506, now seen corresponding path program 1 times [2021-11-12 23:34:39,395 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:34:39,395 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1031710719] [2021-11-12 23:34:39,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:39,396 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:34:39,396 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:34:39,399 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:34:39,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-12 23:34:40,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:40,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 685 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:34:40,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:40,843 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:40,843 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:41,254 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:41,254 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:34:41,254 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1031710719] [2021-11-12 23:34:41,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1031710719] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:34:41,255 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1357520704] [2021-11-12 23:34:41,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:41,255 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:34:41,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:34:41,271 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:34:41,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-12 23:34:41,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:41,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 685 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:34:41,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:42,244 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:34:42,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:42,513 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:34:42,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1357520704] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:34:42,513 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:34:42,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4, 4] total 7 [2021-11-12 23:34:42,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945690384] [2021-11-12 23:34:42,514 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:42,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:34:42,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:34:42,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:34:42,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:42,516 INFO L87 Difference]: Start difference. First operand 1998 states and 2821 transitions. Second operand has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:34:42,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:42,716 INFO L93 Difference]: Finished difference Result 4606 states and 6620 transitions. [2021-11-12 23:34:42,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:34:42,717 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-12 23:34:42,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:42,738 INFO L225 Difference]: With dead ends: 4606 [2021-11-12 23:34:42,739 INFO L226 Difference]: Without dead ends: 2611 [2021-11-12 23:34:42,749 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:42,751 INFO L933 BasicCegarLoop]: 1277 mSDtfsCounter, 246 mSDsluCounter, 972 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 61.66ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 2249 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.09ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 66.56ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:42,751 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [303 Valid, 2249 Invalid, 5 Unknown, 0 Unchecked, 6.09ms Time], IncrementalHoareTripleChecker [1 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 66.56ms Time] [2021-11-12 23:34:42,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2611 states. [2021-11-12 23:34:42,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2611 to 2010. [2021-11-12 23:34:42,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2010 states, 1387 states have (on average 1.3489545782263879) internal successors, (1871), 1425 states have internal predecessors, (1871), 486 states have call successors, (486), 137 states have call predecessors, (486), 136 states have return successors, (480), 480 states have call predecessors, (480), 480 states have call successors, (480) [2021-11-12 23:34:42,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2010 states to 2010 states and 2837 transitions. [2021-11-12 23:34:42,948 INFO L78 Accepts]: Start accepts. Automaton has 2010 states and 2837 transitions. Word has length 29 [2021-11-12 23:34:42,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:42,949 INFO L470 AbstractCegarLoop]: Abstraction has 2010 states and 2837 transitions. [2021-11-12 23:34:42,949 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:34:42,949 INFO L276 IsEmpty]: Start isEmpty. Operand 2010 states and 2837 transitions. [2021-11-12 23:34:42,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-12 23:34:42,951 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:42,951 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:34:42,979 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:43,187 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:43,370 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:34:43,370 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:43,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:43,371 INFO L85 PathProgramCache]: Analyzing trace with hash 1038619191, now seen corresponding path program 1 times [2021-11-12 23:34:43,372 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:34:43,372 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1923544088] [2021-11-12 23:34:43,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:43,372 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:34:43,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:34:43,373 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:34:43,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-12 23:34:44,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:44,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 724 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:34:44,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:44,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:44,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:45,236 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:45,236 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:34:45,237 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1923544088] [2021-11-12 23:34:45,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1923544088] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:34:45,237 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [83507505] [2021-11-12 23:34:45,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:45,237 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:34:45,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:34:45,258 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:34:45,259 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-11-12 23:34:45,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:45,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 724 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:34:45,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:46,400 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:34:46,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:46,740 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:34:46,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [83507505] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:34:46,741 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:34:46,741 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4, 4] total 7 [2021-11-12 23:34:46,741 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751564381] [2021-11-12 23:34:46,741 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:46,742 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:34:46,742 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:34:46,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:34:46,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:46,743 INFO L87 Difference]: Start difference. First operand 2010 states and 2837 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-12 23:34:47,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:47,033 INFO L93 Difference]: Finished difference Result 4662 states and 6704 transitions. [2021-11-12 23:34:47,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:34:47,036 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-11-12 23:34:47,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:47,058 INFO L225 Difference]: With dead ends: 4662 [2021-11-12 23:34:47,058 INFO L226 Difference]: Without dead ends: 2655 [2021-11-12 23:34:47,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:47,071 INFO L933 BasicCegarLoop]: 1014 mSDtfsCounter, 249 mSDsluCounter, 925 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 128.30ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 308 SdHoareTripleChecker+Valid, 1939 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.89ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 135.66ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:47,072 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [308 Valid, 1939 Invalid, 8 Unknown, 0 Unchecked, 5.89ms Time], IncrementalHoareTripleChecker [1 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 135.66ms Time] [2021-11-12 23:34:47,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2655 states. [2021-11-12 23:34:47,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2655 to 2056. [2021-11-12 23:34:47,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2056 states, 1421 states have (on average 1.35045742434905) internal successors, (1919), 1459 states have internal predecessors, (1919), 498 states have call successors, (498), 137 states have call predecessors, (498), 136 states have return successors, (492), 492 states have call predecessors, (492), 492 states have call successors, (492) [2021-11-12 23:34:47,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2056 states to 2056 states and 2909 transitions. [2021-11-12 23:34:47,222 INFO L78 Accepts]: Start accepts. Automaton has 2056 states and 2909 transitions. Word has length 35 [2021-11-12 23:34:47,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:47,223 INFO L470 AbstractCegarLoop]: Abstraction has 2056 states and 2909 transitions. [2021-11-12 23:34:47,223 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-12 23:34:47,223 INFO L276 IsEmpty]: Start isEmpty. Operand 2056 states and 2909 transitions. [2021-11-12 23:34:47,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-12 23:34:47,225 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:47,225 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:34:47,235 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:47,443 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (8)] Ended with exit code 0 [2021-11-12 23:34:47,626 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:34:47,626 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:47,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:47,626 INFO L85 PathProgramCache]: Analyzing trace with hash 1739683769, now seen corresponding path program 1 times [2021-11-12 23:34:47,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:34:47,628 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1938813836] [2021-11-12 23:34:47,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:47,628 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:34:47,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:34:47,629 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:34:47,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-12 23:34:48,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:48,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 724 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:34:48,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:49,071 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:49,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:49,523 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:49,523 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:34:49,523 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1938813836] [2021-11-12 23:34:49,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1938813836] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:34:49,524 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [299898567] [2021-11-12 23:34:49,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:49,524 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:34:49,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:34:49,542 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:34:49,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-12 23:34:50,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:50,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 724 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:34:50,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:50,379 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:34:50,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:50,494 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:34:50,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [299898567] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:34:50,494 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:34:50,494 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4, 4] total 7 [2021-11-12 23:34:50,494 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489833463] [2021-11-12 23:34:50,494 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:50,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:34:50,495 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:34:50,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:34:50,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:50,496 INFO L87 Difference]: Start difference. First operand 2056 states and 2909 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-12 23:34:50,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:50,757 INFO L93 Difference]: Finished difference Result 2078 states and 2935 transitions. [2021-11-12 23:34:50,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:34:50,758 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-11-12 23:34:50,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:50,777 INFO L225 Difference]: With dead ends: 2078 [2021-11-12 23:34:50,778 INFO L226 Difference]: Without dead ends: 2067 [2021-11-12 23:34:50,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:50,780 INFO L933 BasicCegarLoop]: 940 mSDtfsCounter, 923 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 108.87ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 923 SdHoareTripleChecker+Valid, 953 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.23ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 138.34ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:50,780 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [923 Valid, 953 Invalid, 6 Unknown, 0 Unchecked, 3.23ms Time], IncrementalHoareTripleChecker [2 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 138.34ms Time] [2021-11-12 23:34:50,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2067 states. [2021-11-12 23:34:50,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2067 to 2056. [2021-11-12 23:34:50,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2056 states, 1421 states have (on average 1.3490499648135117) internal successors, (1917), 1459 states have internal predecessors, (1917), 498 states have call successors, (498), 137 states have call predecessors, (498), 136 states have return successors, (492), 492 states have call predecessors, (492), 492 states have call successors, (492) [2021-11-12 23:34:50,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2056 states to 2056 states and 2907 transitions. [2021-11-12 23:34:50,945 INFO L78 Accepts]: Start accepts. Automaton has 2056 states and 2907 transitions. Word has length 35 [2021-11-12 23:34:50,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:50,947 INFO L470 AbstractCegarLoop]: Abstraction has 2056 states and 2907 transitions. [2021-11-12 23:34:50,947 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-12 23:34:50,947 INFO L276 IsEmpty]: Start isEmpty. Operand 2056 states and 2907 transitions. [2021-11-12 23:34:50,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-12 23:34:50,949 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:50,949 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:34:50,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:51,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:51,370 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:34:51,371 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:51,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:51,371 INFO L85 PathProgramCache]: Analyzing trace with hash 1796942071, now seen corresponding path program 1 times [2021-11-12 23:34:51,372 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:34:51,372 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1646585266] [2021-11-12 23:34:51,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:51,372 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:34:51,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:34:51,373 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:34:51,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-12 23:34:52,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:52,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 723 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:34:52,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:52,709 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:52,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:53,180 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:53,180 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:34:53,181 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1646585266] [2021-11-12 23:34:53,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1646585266] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:34:53,181 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [624514831] [2021-11-12 23:34:53,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:53,181 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:34:53,181 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:34:53,198 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:34:53,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-12 23:34:53,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:53,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 723 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:34:53,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:54,478 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:34:54,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:55,071 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:34:55,071 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [624514831] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:34:55,072 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:34:55,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4, 4] total 7 [2021-11-12 23:34:55,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361977619] [2021-11-12 23:34:55,072 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:55,073 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:34:55,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:34:55,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:34:55,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:55,073 INFO L87 Difference]: Start difference. First operand 2056 states and 2907 transitions. Second operand has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 3 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 23:34:57,145 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:34:57,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:57,296 INFO L93 Difference]: Finished difference Result 2058 states and 2908 transitions. [2021-11-12 23:34:57,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:34:57,297 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 3 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 35 [2021-11-12 23:34:57,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:57,312 INFO L225 Difference]: With dead ends: 2058 [2021-11-12 23:34:57,312 INFO L226 Difference]: Without dead ends: 2055 [2021-11-12 23:34:57,313 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:57,314 INFO L933 BasicCegarLoop]: 925 mSDtfsCounter, 894 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2081.93ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 894 SdHoareTripleChecker+Valid, 925 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.19ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2114.98ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:57,314 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [894 Valid, 925 Invalid, 2 Unknown, 0 Unchecked, 3.19ms Time], IncrementalHoareTripleChecker [0 Valid, 1 Invalid, 1 Unknown, 0 Unchecked, 2114.98ms Time] [2021-11-12 23:34:57,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2055 states. [2021-11-12 23:34:57,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2055 to 2055. [2021-11-12 23:34:57,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2055 states, 1421 states have (on average 1.3483462350457425) internal successors, (1916), 1458 states have internal predecessors, (1916), 497 states have call successors, (497), 137 states have call predecessors, (497), 136 states have return successors, (492), 492 states have call predecessors, (492), 492 states have call successors, (492) [2021-11-12 23:34:57,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2055 states to 2055 states and 2905 transitions. [2021-11-12 23:34:57,468 INFO L78 Accepts]: Start accepts. Automaton has 2055 states and 2905 transitions. Word has length 35 [2021-11-12 23:34:57,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:57,469 INFO L470 AbstractCegarLoop]: Abstraction has 2055 states and 2905 transitions. [2021-11-12 23:34:57,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 3 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 23:34:57,469 INFO L276 IsEmpty]: Start isEmpty. Operand 2055 states and 2905 transitions. [2021-11-12 23:34:57,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-12 23:34:57,471 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:57,471 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:34:57,498 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:57,689 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (13)] Ended with exit code 0 [2021-11-12 23:34:57,885 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:34:57,886 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:57,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:57,886 INFO L85 PathProgramCache]: Analyzing trace with hash -129755051, now seen corresponding path program 1 times [2021-11-12 23:34:57,887 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:34:57,887 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [714457398] [2021-11-12 23:34:57,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:57,887 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:34:57,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:34:57,888 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:34:57,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-12 23:34:58,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:58,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 724 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:34:58,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:59,256 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:59,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:59,713 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:59,713 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:34:59,713 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [714457398] [2021-11-12 23:34:59,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [714457398] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:34:59,714 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1583062428] [2021-11-12 23:34:59,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:59,714 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:34:59,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:34:59,715 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:34:59,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-12 23:35:00,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:35:00,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 724 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:35:00,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:35:00,996 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:35:00,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:35:01,600 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:35:01,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1583062428] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:35:01,600 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:35:01,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4, 4] total 7 [2021-11-12 23:35:01,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048769893] [2021-11-12 23:35:01,601 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:35:01,601 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:35:01,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:35:01,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:35:01,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:35:01,602 INFO L87 Difference]: Start difference. First operand 2055 states and 2905 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 23:35:03,670 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:35:03,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:35:03,823 INFO L93 Difference]: Finished difference Result 2057 states and 2906 transitions. [2021-11-12 23:35:03,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:35:03,824 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 36 [2021-11-12 23:35:03,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:35:03,840 INFO L225 Difference]: With dead ends: 2057 [2021-11-12 23:35:03,840 INFO L226 Difference]: Without dead ends: 2054 [2021-11-12 23:35:03,841 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:35:03,844 INFO L933 BasicCegarLoop]: 923 mSDtfsCounter, 891 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2075.95ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 891 SdHoareTripleChecker+Valid, 923 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.39ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2102.35ms IncrementalHoareTripleChecker+Time [2021-11-12 23:35:03,844 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [891 Valid, 923 Invalid, 2 Unknown, 0 Unchecked, 3.39ms Time], IncrementalHoareTripleChecker [0 Valid, 1 Invalid, 1 Unknown, 0 Unchecked, 2102.35ms Time] [2021-11-12 23:35:03,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2054 states. [2021-11-12 23:35:03,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2054 to 2054. [2021-11-12 23:35:03,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2054 states, 1421 states have (on average 1.3476425052779732) internal successors, (1915), 1457 states have internal predecessors, (1915), 496 states have call successors, (496), 137 states have call predecessors, (496), 136 states have return successors, (492), 492 states have call predecessors, (492), 492 states have call successors, (492) [2021-11-12 23:35:03,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2054 states to 2054 states and 2903 transitions. [2021-11-12 23:35:03,991 INFO L78 Accepts]: Start accepts. Automaton has 2054 states and 2903 transitions. Word has length 36 [2021-11-12 23:35:03,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:35:03,992 INFO L470 AbstractCegarLoop]: Abstraction has 2054 states and 2903 transitions. [2021-11-12 23:35:03,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 23:35:03,992 INFO L276 IsEmpty]: Start isEmpty. Operand 2054 states and 2903 transitions. [2021-11-12 23:35:03,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-12 23:35:03,993 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:35:03,993 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:35:04,023 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-12 23:35:04,212 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-11-12 23:35:04,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:35:04,410 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:35:04,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:35:04,410 INFO L85 PathProgramCache]: Analyzing trace with hash 272181178, now seen corresponding path program 1 times [2021-11-12 23:35:04,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:35:04,411 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1978334302] [2021-11-12 23:35:04,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:35:04,412 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:35:04,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:35:04,413 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:35:04,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-12 23:35:05,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:35:05,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 725 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:35:05,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:35:05,759 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:35:05,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:35:06,213 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:35:06,213 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:35:06,213 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1978334302] [2021-11-12 23:35:06,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1978334302] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:35:06,214 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [225223829] [2021-11-12 23:35:06,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:35:06,214 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:35:06,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:35:06,215 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:35:06,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-12 23:35:06,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:35:06,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 725 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:35:06,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:35:07,472 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:35:07,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:35:08,101 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:35:08,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [225223829] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:35:08,101 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:35:08,102 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4, 4] total 7 [2021-11-12 23:35:08,102 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072350487] [2021-11-12 23:35:08,102 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:35:08,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:35:08,102 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:35:08,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:35:08,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:35:08,103 INFO L87 Difference]: Start difference. First operand 2054 states and 2903 transitions. Second operand has 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 23:35:10,174 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:35:10,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:35:10,324 INFO L93 Difference]: Finished difference Result 2056 states and 2904 transitions. [2021-11-12 23:35:10,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:35:10,326 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2021-11-12 23:35:10,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:35:10,339 INFO L225 Difference]: With dead ends: 2056 [2021-11-12 23:35:10,339 INFO L226 Difference]: Without dead ends: 2053 [2021-11-12 23:35:10,340 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:35:10,341 INFO L933 BasicCegarLoop]: 921 mSDtfsCounter, 888 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2079.36ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 888 SdHoareTripleChecker+Valid, 921 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.79ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2102.80ms IncrementalHoareTripleChecker+Time [2021-11-12 23:35:10,342 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [888 Valid, 921 Invalid, 2 Unknown, 0 Unchecked, 2.79ms Time], IncrementalHoareTripleChecker [0 Valid, 1 Invalid, 1 Unknown, 0 Unchecked, 2102.80ms Time] [2021-11-12 23:35:10,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2053 states. [2021-11-12 23:35:10,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2053 to 2053. [2021-11-12 23:35:10,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2053 states, 1421 states have (on average 1.346938775510204) internal successors, (1914), 1456 states have internal predecessors, (1914), 495 states have call successors, (495), 137 states have call predecessors, (495), 136 states have return successors, (492), 492 states have call predecessors, (492), 492 states have call successors, (492) [2021-11-12 23:35:10,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2053 states to 2053 states and 2901 transitions. [2021-11-12 23:35:10,512 INFO L78 Accepts]: Start accepts. Automaton has 2053 states and 2901 transitions. Word has length 37 [2021-11-12 23:35:10,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:35:10,512 INFO L470 AbstractCegarLoop]: Abstraction has 2053 states and 2901 transitions. [2021-11-12 23:35:10,513 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 23:35:10,513 INFO L276 IsEmpty]: Start isEmpty. Operand 2053 states and 2901 transitions. [2021-11-12 23:35:10,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-12 23:35:10,515 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:35:10,515 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:35:10,542 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-12 23:35:10,732 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (17)] Ended with exit code 0 [2021-11-12 23:35:10,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:35:10,928 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:35:10,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:35:10,929 INFO L85 PathProgramCache]: Analyzing trace with hash -152692744, now seen corresponding path program 1 times [2021-11-12 23:35:10,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:35:10,930 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [337921840] [2021-11-12 23:35:10,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:35:10,931 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:35:10,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:35:10,932 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:35:10,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-12 23:35:11,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:35:11,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 726 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:35:11,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:35:12,375 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:35:12,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:35:12,838 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:35:12,838 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:35:12,838 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [337921840] [2021-11-12 23:35:12,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [337921840] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:35:12,838 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [223383088] [2021-11-12 23:35:12,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:35:12,839 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:35:12,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:35:12,841 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:35:12,843 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-12 23:35:13,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:35:13,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 726 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:35:13,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:35:14,109 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:35:14,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:35:14,746 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:35:14,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [223383088] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:35:14,747 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:35:14,747 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4, 4] total 7 [2021-11-12 23:35:14,747 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000424404] [2021-11-12 23:35:14,747 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:35:14,748 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:35:14,748 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:35:14,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:35:14,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:35:14,749 INFO L87 Difference]: Start difference. First operand 2053 states and 2901 transitions. Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 23:35:16,822 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:35:17,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:35:17,057 INFO L93 Difference]: Finished difference Result 2657 states and 3678 transitions. [2021-11-12 23:35:17,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:35:17,058 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 38 [2021-11-12 23:35:17,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:35:17,077 INFO L225 Difference]: With dead ends: 2657 [2021-11-12 23:35:17,077 INFO L226 Difference]: Without dead ends: 2620 [2021-11-12 23:35:17,079 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:35:17,079 INFO L933 BasicCegarLoop]: 1046 mSDtfsCounter, 818 mSDsluCounter, 377 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2109.84ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 818 SdHoareTripleChecker+Valid, 1423 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.52ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2136.63ms IncrementalHoareTripleChecker+Time [2021-11-12 23:35:17,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [818 Valid, 1423 Invalid, 7 Unknown, 0 Unchecked, 4.52ms Time], IncrementalHoareTripleChecker [2 Valid, 4 Invalid, 1 Unknown, 0 Unchecked, 2136.63ms Time] [2021-11-12 23:35:17,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2620 states. [2021-11-12 23:35:17,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2620 to 1916. [2021-11-12 23:35:17,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1916 states, 1300 states have (on average 1.32) internal successors, (1716), 1335 states have internal predecessors, (1716), 469 states have call successors, (469), 147 states have call predecessors, (469), 146 states have return successors, (468), 468 states have call predecessors, (468), 468 states have call successors, (468) [2021-11-12 23:35:17,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1916 states to 1916 states and 2653 transitions. [2021-11-12 23:35:17,239 INFO L78 Accepts]: Start accepts. Automaton has 1916 states and 2653 transitions. Word has length 38 [2021-11-12 23:35:17,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:35:17,239 INFO L470 AbstractCegarLoop]: Abstraction has 1916 states and 2653 transitions. [2021-11-12 23:35:17,240 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-12 23:35:17,240 INFO L276 IsEmpty]: Start isEmpty. Operand 1916 states and 2653 transitions. [2021-11-12 23:35:17,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-12 23:35:17,244 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:35:17,244 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:35:17,280 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-12 23:35:17,461 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-12 23:35:17,658 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:35:17,658 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:35:17,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:35:17,658 INFO L85 PathProgramCache]: Analyzing trace with hash -1937560449, now seen corresponding path program 1 times [2021-11-12 23:35:17,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:35:17,659 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1904781130] [2021-11-12 23:35:17,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:35:17,660 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:35:17,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:35:17,660 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:35:17,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-12 23:35:18,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:35:18,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 831 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:35:18,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:35:19,430 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:35:19,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:35:20,112 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:35:20,113 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:35:20,113 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1904781130] [2021-11-12 23:35:20,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1904781130] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:35:20,113 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1773892865] [2021-11-12 23:35:20,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:35:20,114 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:35:20,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:35:20,115 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:35:20,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-12 23:35:20,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:35:20,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 831 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:35:20,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:35:21,337 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:35:21,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:35:21,993 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:35:21,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1773892865] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:35:21,993 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:35:21,994 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [4, 4] total 10 [2021-11-12 23:35:21,994 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646625844] [2021-11-12 23:35:21,994 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:35:21,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 23:35:21,995 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:35:21,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 23:35:21,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:35:21,996 INFO L87 Difference]: Start difference. First operand 1916 states and 2653 transitions. Second operand has 6 states, 6 states have (on average 11.0) internal successors, (66), 6 states have internal predecessors, (66), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:35:23,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:35:23,309 INFO L93 Difference]: Finished difference Result 4567 states and 6483 transitions. [2021-11-12 23:35:23,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 23:35:23,310 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 11.0) internal successors, (66), 6 states have internal predecessors, (66), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 65 [2021-11-12 23:35:23,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:35:23,330 INFO L225 Difference]: With dead ends: 4567 [2021-11-12 23:35:23,330 INFO L226 Difference]: Without dead ends: 2654 [2021-11-12 23:35:23,338 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 249 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-12 23:35:23,339 INFO L933 BasicCegarLoop]: 1282 mSDtfsCounter, 658 mSDsluCounter, 3466 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 877.31ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 704 SdHoareTripleChecker+Valid, 4748 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 13.62ms SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 929.61ms IncrementalHoareTripleChecker+Time [2021-11-12 23:35:23,340 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [704 Valid, 4748 Invalid, 200 Unknown, 0 Unchecked, 13.62ms Time], IncrementalHoareTripleChecker [139 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 929.61ms Time] [2021-11-12 23:35:23,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2654 states. [2021-11-12 23:35:23,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2654 to 1920. [2021-11-12 23:35:23,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1920 states, 1304 states have (on average 1.3190184049079754) internal successors, (1720), 1339 states have internal predecessors, (1720), 469 states have call successors, (469), 147 states have call predecessors, (469), 146 states have return successors, (468), 468 states have call predecessors, (468), 468 states have call successors, (468) [2021-11-12 23:35:23,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1920 states to 1920 states and 2657 transitions. [2021-11-12 23:35:23,497 INFO L78 Accepts]: Start accepts. Automaton has 1920 states and 2657 transitions. Word has length 65 [2021-11-12 23:35:23,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:35:23,499 INFO L470 AbstractCegarLoop]: Abstraction has 1920 states and 2657 transitions. [2021-11-12 23:35:23,499 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 11.0) internal successors, (66), 6 states have internal predecessors, (66), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:35:23,499 INFO L276 IsEmpty]: Start isEmpty. Operand 1920 states and 2657 transitions. [2021-11-12 23:35:23,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-12 23:35:23,503 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:35:23,503 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:35:23,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-12 23:35:23,721 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (21)] Ended with exit code 0 [2021-11-12 23:35:23,918 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:35:23,918 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:35:23,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:35:23,918 INFO L85 PathProgramCache]: Analyzing trace with hash 2097740462, now seen corresponding path program 1 times [2021-11-12 23:35:23,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:35:23,919 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1323282396] [2021-11-12 23:35:23,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:35:23,920 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:35:23,920 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:35:23,920 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:35:23,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-12 23:35:24,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:35:25,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 861 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:35:25,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:35:25,918 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:35:25,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:35:26,649 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:35:26,649 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:35:26,649 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1323282396] [2021-11-12 23:35:26,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1323282396] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:35:26,650 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1901724624] [2021-11-12 23:35:26,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:35:26,650 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:35:26,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:35:26,651 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:35:26,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-12 23:35:27,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:35:27,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 861 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:35:27,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:35:28,125 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:35:28,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:35:29,211 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 23:35:29,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1901724624] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:35:29,211 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:35:29,211 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [4, 4] total 12 [2021-11-12 23:35:29,211 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472223713] [2021-11-12 23:35:29,211 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:35:29,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 23:35:29,212 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:35:29,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 23:35:29,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-11-12 23:35:29,213 INFO L87 Difference]: Start difference. First operand 1920 states and 2657 transitions. Second operand has 8 states, 8 states have (on average 9.375) internal successors, (75), 6 states have internal predecessors, (75), 2 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (9), 4 states have call predecessors, (9), 2 states have call successors, (9) [2021-11-12 23:35:30,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:35:30,414 INFO L93 Difference]: Finished difference Result 4663 states and 6619 transitions. [2021-11-12 23:35:30,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 23:35:30,414 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 9.375) internal successors, (75), 6 states have internal predecessors, (75), 2 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (9), 4 states have call predecessors, (9), 2 states have call successors, (9) Word has length 75 [2021-11-12 23:35:30,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:35:30,436 INFO L225 Difference]: With dead ends: 4663 [2021-11-12 23:35:30,437 INFO L226 Difference]: Without dead ends: 2746 [2021-11-12 23:35:30,446 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 286 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-11-12 23:35:30,447 INFO L933 BasicCegarLoop]: 1246 mSDtfsCounter, 425 mSDsluCounter, 7044 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 904.36ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 527 SdHoareTripleChecker+Valid, 8290 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 14.62ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 946.28ms IncrementalHoareTripleChecker+Time [2021-11-12 23:35:30,447 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [527 Valid, 8290 Invalid, 79 Unknown, 0 Unchecked, 14.62ms Time], IncrementalHoareTripleChecker [1 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 946.28ms Time] [2021-11-12 23:35:30,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2746 states. [2021-11-12 23:35:30,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2746 to 1932. [2021-11-12 23:35:30,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1932 states, 1314 states have (on average 1.3165905631659056) internal successors, (1730), 1347 states have internal predecessors, (1730), 469 states have call successors, (469), 147 states have call predecessors, (469), 148 states have return successors, (476), 472 states have call predecessors, (476), 468 states have call successors, (476) [2021-11-12 23:35:30,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1932 states to 1932 states and 2675 transitions. [2021-11-12 23:35:30,615 INFO L78 Accepts]: Start accepts. Automaton has 1932 states and 2675 transitions. Word has length 75 [2021-11-12 23:35:30,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:35:30,615 INFO L470 AbstractCegarLoop]: Abstraction has 1932 states and 2675 transitions. [2021-11-12 23:35:30,616 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 9.375) internal successors, (75), 6 states have internal predecessors, (75), 2 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (9), 4 states have call predecessors, (9), 2 states have call successors, (9) [2021-11-12 23:35:30,616 INFO L276 IsEmpty]: Start isEmpty. Operand 1932 states and 2675 transitions. [2021-11-12 23:35:30,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-12 23:35:30,619 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:35:30,619 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:35:30,652 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-12 23:35:30,837 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-11-12 23:35:31,034 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:35:31,034 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:35:31,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:35:31,034 INFO L85 PathProgramCache]: Analyzing trace with hash -1047147176, now seen corresponding path program 1 times [2021-11-12 23:35:31,035 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:35:31,035 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [762875002] [2021-11-12 23:35:31,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:35:31,036 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:35:31,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:35:31,037 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:35:31,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-12 23:35:32,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:35:32,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 865 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:35:32,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:35:33,061 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:35:33,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:35:34,008 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:35:34,008 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:35:34,008 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [762875002] [2021-11-12 23:35:34,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [762875002] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:35:34,008 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:35:34,008 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2021-11-12 23:35:34,009 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997812346] [2021-11-12 23:35:34,009 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:35:34,009 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 23:35:34,009 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:35:34,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 23:35:34,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:35:34,010 INFO L87 Difference]: Start difference. First operand 1932 states and 2675 transitions. Second operand has 8 states, 8 states have (on average 9.375) internal successors, (75), 6 states have internal predecessors, (75), 2 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (9), 4 states have call predecessors, (9), 2 states have call successors, (9) [2021-11-12 23:35:35,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:35:35,389 INFO L93 Difference]: Finished difference Result 4859 states and 6925 transitions. [2021-11-12 23:35:35,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-12 23:35:35,390 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 9.375) internal successors, (75), 6 states have internal predecessors, (75), 2 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (9), 4 states have call predecessors, (9), 2 states have call successors, (9) Word has length 75 [2021-11-12 23:35:35,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:35:35,414 INFO L225 Difference]: With dead ends: 4859 [2021-11-12 23:35:35,414 INFO L226 Difference]: Without dead ends: 2930 [2021-11-12 23:35:35,422 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:35:35,423 INFO L933 BasicCegarLoop]: 1117 mSDtfsCounter, 463 mSDsluCounter, 4262 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 879.64ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 579 SdHoareTripleChecker+Valid, 5379 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.19ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 930.18ms IncrementalHoareTripleChecker+Time [2021-11-12 23:35:35,424 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [579 Valid, 5379 Invalid, 79 Unknown, 0 Unchecked, 9.19ms Time], IncrementalHoareTripleChecker [1 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 930.18ms Time] [2021-11-12 23:35:35,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2930 states. [2021-11-12 23:35:35,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2930 to 1940. [2021-11-12 23:35:35,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1940 states, 1322 states have (on average 1.3146747352496218) internal successors, (1738), 1351 states have internal predecessors, (1738), 469 states have call successors, (469), 147 states have call predecessors, (469), 148 states have return successors, (476), 476 states have call predecessors, (476), 468 states have call successors, (476) [2021-11-12 23:35:35,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1940 states to 1940 states and 2683 transitions. [2021-11-12 23:35:35,603 INFO L78 Accepts]: Start accepts. Automaton has 1940 states and 2683 transitions. Word has length 75 [2021-11-12 23:35:35,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:35:35,603 INFO L470 AbstractCegarLoop]: Abstraction has 1940 states and 2683 transitions. [2021-11-12 23:35:35,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 9.375) internal successors, (75), 6 states have internal predecessors, (75), 2 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (9), 4 states have call predecessors, (9), 2 states have call successors, (9) [2021-11-12 23:35:35,604 INFO L276 IsEmpty]: Start isEmpty. Operand 1940 states and 2683 transitions. [2021-11-12 23:35:35,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-11-12 23:35:35,616 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:35:35,617 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:35:35,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-12 23:35:35,825 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:35:35,826 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:35:35,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:35:35,826 INFO L85 PathProgramCache]: Analyzing trace with hash -1518345578, now seen corresponding path program 1 times [2021-11-12 23:35:35,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:35:35,829 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [783656364] [2021-11-12 23:35:35,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:35:35,829 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:35:35,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:35:35,830 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:35:35,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-12 23:35:37,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:35:37,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 1274 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:35:37,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:35:39,254 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-12 23:35:39,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:35:40,237 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-12 23:35:40,237 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:35:40,238 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [783656364] [2021-11-12 23:35:40,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [783656364] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:35:40,238 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1590445948] [2021-11-12 23:35:40,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:35:40,238 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:35:40,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:35:40,239 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:35:40,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-12 23:35:40,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:35:40,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 1274 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:35:40,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:35:41,784 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-12 23:35:41,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:35:42,908 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-12 23:35:42,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1590445948] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:35:42,909 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:35:42,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4, 4] total 7 [2021-11-12 23:35:42,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553627866] [2021-11-12 23:35:42,910 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:35:42,911 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:35:42,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:35:42,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:35:42,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:35:42,912 INFO L87 Difference]: Start difference. First operand 1940 states and 2683 transitions. Second operand has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 3 states have internal predecessors, (121), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-12 23:35:43,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:35:43,150 INFO L93 Difference]: Finished difference Result 3897 states and 5441 transitions. [2021-11-12 23:35:43,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:35:43,150 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 3 states have internal predecessors, (121), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) Word has length 173 [2021-11-12 23:35:43,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:35:43,166 INFO L225 Difference]: With dead ends: 3897 [2021-11-12 23:35:43,166 INFO L226 Difference]: Without dead ends: 1960 [2021-11-12 23:35:43,174 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 688 GetRequests, 683 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:35:43,175 INFO L933 BasicCegarLoop]: 883 mSDtfsCounter, 3 mSDsluCounter, 876 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 86.10ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 1759 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.94ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 88.64ms IncrementalHoareTripleChecker+Time [2021-11-12 23:35:43,175 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 1759 Invalid, 9 Unknown, 0 Unchecked, 2.94ms Time], IncrementalHoareTripleChecker [1 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 88.64ms Time] [2021-11-12 23:35:43,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1960 states. [2021-11-12 23:35:43,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1960 to 1945. [2021-11-12 23:35:43,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1945 states, 1327 states have (on average 1.3134890730972117) internal successors, (1743), 1356 states have internal predecessors, (1743), 469 states have call successors, (469), 147 states have call predecessors, (469), 148 states have return successors, (476), 476 states have call predecessors, (476), 468 states have call successors, (476) [2021-11-12 23:35:43,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1945 states to 1945 states and 2688 transitions. [2021-11-12 23:35:43,369 INFO L78 Accepts]: Start accepts. Automaton has 1945 states and 2688 transitions. Word has length 173 [2021-11-12 23:35:43,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:35:43,369 INFO L470 AbstractCegarLoop]: Abstraction has 1945 states and 2688 transitions. [2021-11-12 23:35:43,370 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 40.333333333333336) internal successors, (121), 3 states have internal predecessors, (121), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-12 23:35:43,370 INFO L276 IsEmpty]: Start isEmpty. Operand 1945 states and 2688 transitions. [2021-11-12 23:35:43,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2021-11-12 23:35:43,377 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:35:43,378 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:35:43,411 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-12 23:35:43,606 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-12 23:35:43,802 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:35:43,802 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:35:43,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:35:43,803 INFO L85 PathProgramCache]: Analyzing trace with hash -2110004446, now seen corresponding path program 1 times [2021-11-12 23:35:43,804 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:35:43,804 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [198561034] [2021-11-12 23:35:43,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:35:43,804 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:35:43,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:35:43,805 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:35:43,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-12 23:35:45,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:35:45,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 1464 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:35:45,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:35:47,924 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-12 23:35:47,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:35:49,113 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-12 23:35:49,113 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:35:49,113 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [198561034] [2021-11-12 23:35:49,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [198561034] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:35:49,113 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2116981186] [2021-11-12 23:35:49,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:35:49,114 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:35:49,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:35:49,115 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:35:49,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-12 23:35:49,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:35:49,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 1464 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:35:49,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:35:51,855 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-12 23:35:51,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:35:54,330 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-12 23:35:54,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2116981186] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:35:54,330 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:35:54,331 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4, 4, 5] total 9 [2021-11-12 23:35:54,331 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170929077] [2021-11-12 23:35:54,331 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:35:54,332 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:35:54,332 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:35:54,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:35:54,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:35:54,333 INFO L87 Difference]: Start difference. First operand 1945 states and 2688 transitions. Second operand has 5 states, 5 states have (on average 28.6) internal successors, (143), 4 states have internal predecessors, (143), 2 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (32), 3 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 23:35:54,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:35:54,636 INFO L93 Difference]: Finished difference Result 3917 states and 5541 transitions. [2021-11-12 23:35:54,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 23:35:54,636 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 28.6) internal successors, (143), 4 states have internal predecessors, (143), 2 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (32), 3 states have call predecessors, (32), 2 states have call successors, (32) Word has length 227 [2021-11-12 23:35:54,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:35:54,648 INFO L225 Difference]: With dead ends: 3917 [2021-11-12 23:35:54,648 INFO L226 Difference]: Without dead ends: 1975 [2021-11-12 23:35:54,656 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 904 GetRequests, 897 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:35:54,657 INFO L933 BasicCegarLoop]: 889 mSDtfsCounter, 11 mSDsluCounter, 2645 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 127.69ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 3534 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.57ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 130.97ms IncrementalHoareTripleChecker+Time [2021-11-12 23:35:54,657 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 3534 Invalid, 11 Unknown, 0 Unchecked, 5.57ms Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 130.97ms Time] [2021-11-12 23:35:54,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1975 states. [2021-11-12 23:35:54,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1975 to 1965. [2021-11-12 23:35:54,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1965 states, 1342 states have (on average 1.3099850968703428) internal successors, (1758), 1371 states have internal predecessors, (1758), 469 states have call successors, (469), 147 states have call predecessors, (469), 153 states have return successors, (500), 481 states have call predecessors, (500), 468 states have call successors, (500) [2021-11-12 23:35:54,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1965 states to 1965 states and 2727 transitions. [2021-11-12 23:35:54,848 INFO L78 Accepts]: Start accepts. Automaton has 1965 states and 2727 transitions. Word has length 227 [2021-11-12 23:35:54,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:35:54,849 INFO L470 AbstractCegarLoop]: Abstraction has 1965 states and 2727 transitions. [2021-11-12 23:35:54,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 28.6) internal successors, (143), 4 states have internal predecessors, (143), 2 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (32), 3 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 23:35:54,849 INFO L276 IsEmpty]: Start isEmpty. Operand 1965 states and 2727 transitions. [2021-11-12 23:35:54,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 296 [2021-11-12 23:35:54,859 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:35:54,860 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 6, 6, 6, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:35:54,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-12 23:35:55,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-12 23:35:55,271 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:35:55,271 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:35:55,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:35:55,272 INFO L85 PathProgramCache]: Analyzing trace with hash -1899924706, now seen corresponding path program 1 times [2021-11-12 23:35:55,273 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:35:55,273 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1479791283] [2021-11-12 23:35:55,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:35:55,273 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:35:55,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:35:55,274 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:35:55,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-12 23:35:56,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:35:56,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 1629 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:35:56,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:36:00,380 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2021-11-12 23:36:00,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:36:02,042 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2021-11-12 23:36:02,042 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:36:02,042 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1479791283] [2021-11-12 23:36:02,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1479791283] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:36:02,043 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1421181683] [2021-11-12 23:36:02,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:36:02,043 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:36:02,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:36:02,046 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:36:02,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-12 23:36:02,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:36:02,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 1629 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 23:36:02,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:36:04,962 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2021-11-12 23:36:04,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:36:09,051 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-11-12 23:36:09,052 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1421181683] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:36:09,052 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:36:09,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [4, 4, 9] total 18 [2021-11-12 23:36:09,053 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719281482] [2021-11-12 23:36:09,053 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:36:09,053 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-12 23:36:09,054 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:36:09,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-12 23:36:09,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2021-11-12 23:36:09,055 INFO L87 Difference]: Start difference. First operand 1965 states and 2727 transitions. Second operand has 7 states, 7 states have (on average 18.714285714285715) internal successors, (131), 5 states have internal predecessors, (131), 2 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (30), 4 states have call predecessors, (30), 2 states have call successors, (30) [2021-11-12 23:36:09,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:36:09,522 INFO L93 Difference]: Finished difference Result 4352 states and 6126 transitions. [2021-11-12 23:36:09,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 23:36:09,523 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 18.714285714285715) internal successors, (131), 5 states have internal predecessors, (131), 2 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (30), 4 states have call predecessors, (30), 2 states have call successors, (30) Word has length 295 [2021-11-12 23:36:09,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:36:09,541 INFO L225 Difference]: With dead ends: 4352 [2021-11-12 23:36:09,541 INFO L226 Difference]: Without dead ends: 2390 [2021-11-12 23:36:09,549 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1176 GetRequests, 1160 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2021-11-12 23:36:09,551 INFO L933 BasicCegarLoop]: 1183 mSDtfsCounter, 213 mSDsluCounter, 5652 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 260.30ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 265 SdHoareTripleChecker+Valid, 6835 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.36ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 276.78ms IncrementalHoareTripleChecker+Time [2021-11-12 23:36:09,551 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [265 Valid, 6835 Invalid, 27 Unknown, 0 Unchecked, 9.36ms Time], IncrementalHoareTripleChecker [3 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 276.78ms Time] [2021-11-12 23:36:09,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2390 states. [2021-11-12 23:36:09,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2390 to 1975. [2021-11-12 23:36:09,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1975 states, 1348 states have (on average 1.3086053412462908) internal successors, (1764), 1379 states have internal predecessors, (1764), 469 states have call successors, (469), 147 states have call predecessors, (469), 157 states have return successors, (512), 483 states have call predecessors, (512), 468 states have call successors, (512) [2021-11-12 23:36:09,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1975 states to 1975 states and 2745 transitions. [2021-11-12 23:36:09,739 INFO L78 Accepts]: Start accepts. Automaton has 1975 states and 2745 transitions. Word has length 295 [2021-11-12 23:36:09,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:36:09,740 INFO L470 AbstractCegarLoop]: Abstraction has 1975 states and 2745 transitions. [2021-11-12 23:36:09,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 18.714285714285715) internal successors, (131), 5 states have internal predecessors, (131), 2 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (30), 4 states have call predecessors, (30), 2 states have call successors, (30) [2021-11-12 23:36:09,740 INFO L276 IsEmpty]: Start isEmpty. Operand 1975 states and 2745 transitions. [2021-11-12 23:36:09,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2021-11-12 23:36:09,748 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:36:09,749 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 6, 6, 6, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:36:09,792 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-12 23:36:09,981 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (30)] Ended with exit code 0 [2021-11-12 23:36:10,174 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:36:10,174 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:36:10,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:36:10,174 INFO L85 PathProgramCache]: Analyzing trace with hash -39011716, now seen corresponding path program 1 times [2021-11-12 23:36:10,175 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:36:10,176 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [159557746] [2021-11-12 23:36:10,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:36:10,176 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:36:10,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:36:10,177 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:36:10,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-12 23:36:11,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:36:11,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 1624 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:36:11,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:36:14,894 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2021-11-12 23:36:14,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:36:16,281 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2021-11-12 23:36:16,282 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:36:16,282 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [159557746] [2021-11-12 23:36:16,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [159557746] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:36:16,282 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1161355096] [2021-11-12 23:36:16,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:36:16,282 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:36:16,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:36:16,283 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:36:16,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-12 23:36:17,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:36:17,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 1624 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 23:36:17,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:36:19,579 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2021-11-12 23:36:19,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:36:23,890 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-11-12 23:36:23,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1161355096] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:36:23,891 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:36:23,891 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [4, 4, 9] total 18 [2021-11-12 23:36:23,891 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403608279] [2021-11-12 23:36:23,891 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:36:23,892 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-12 23:36:23,892 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:36:23,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-12 23:36:23,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2021-11-12 23:36:23,893 INFO L87 Difference]: Start difference. First operand 1975 states and 2745 transitions. Second operand has 7 states, 7 states have (on average 18.428571428571427) internal successors, (129), 5 states have internal predecessors, (129), 2 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (30), 4 states have call predecessors, (30), 2 states have call successors, (30) [2021-11-12 23:36:24,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:36:24,402 INFO L93 Difference]: Finished difference Result 4376 states and 6164 transitions. [2021-11-12 23:36:24,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 23:36:24,405 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 18.428571428571427) internal successors, (129), 5 states have internal predecessors, (129), 2 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (30), 4 states have call predecessors, (30), 2 states have call successors, (30) Word has length 293 [2021-11-12 23:36:24,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:36:24,420 INFO L225 Difference]: With dead ends: 4376 [2021-11-12 23:36:24,420 INFO L226 Difference]: Without dead ends: 2404 [2021-11-12 23:36:24,428 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1168 GetRequests, 1152 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2021-11-12 23:36:24,429 INFO L933 BasicCegarLoop]: 1173 mSDtfsCounter, 213 mSDsluCounter, 5609 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 267.98ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 265 SdHoareTripleChecker+Valid, 6782 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 10.77ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 280.68ms IncrementalHoareTripleChecker+Time [2021-11-12 23:36:24,430 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [265 Valid, 6782 Invalid, 27 Unknown, 0 Unchecked, 10.77ms Time], IncrementalHoareTripleChecker [3 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 280.68ms Time] [2021-11-12 23:36:24,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2404 states. [2021-11-12 23:36:24,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2404 to 1977. [2021-11-12 23:36:24,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1977 states, 1350 states have (on average 1.308148148148148) internal successors, (1766), 1379 states have internal predecessors, (1766), 469 states have call successors, (469), 147 states have call predecessors, (469), 157 states have return successors, (512), 485 states have call predecessors, (512), 468 states have call successors, (512) [2021-11-12 23:36:24,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1977 states to 1977 states and 2747 transitions. [2021-11-12 23:36:24,639 INFO L78 Accepts]: Start accepts. Automaton has 1977 states and 2747 transitions. Word has length 293 [2021-11-12 23:36:24,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:36:24,640 INFO L470 AbstractCegarLoop]: Abstraction has 1977 states and 2747 transitions. [2021-11-12 23:36:24,640 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 18.428571428571427) internal successors, (129), 5 states have internal predecessors, (129), 2 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (30), 4 states have call predecessors, (30), 2 states have call successors, (30) [2021-11-12 23:36:24,640 INFO L276 IsEmpty]: Start isEmpty. Operand 1977 states and 2747 transitions. [2021-11-12 23:36:24,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2021-11-12 23:36:24,648 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:36:24,648 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 6, 6, 6, 6, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:36:24,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-12 23:36:24,907 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-12 23:36:25,066 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:36:25,067 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:36:25,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:36:25,067 INFO L85 PathProgramCache]: Analyzing trace with hash 1013278922, now seen corresponding path program 1 times [2021-11-12 23:36:25,069 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:36:25,069 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [436098475] [2021-11-12 23:36:25,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:36:25,070 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:36:25,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:36:25,071 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:36:25,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-12 23:36:26,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:36:27,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 1628 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:36:27,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:36:29,983 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2021-11-12 23:36:29,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:36:31,658 INFO L134 CoverageAnalysis]: Checked inductivity of 249 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2021-11-12 23:36:31,658 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:36:31,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [436098475] [2021-11-12 23:36:31,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [436098475] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:36:31,659 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:36:31,659 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-12 23:36:31,659 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373497137] [2021-11-12 23:36:31,659 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:36:31,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 23:36:31,661 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:36:31,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 23:36:31,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:36:31,661 INFO L87 Difference]: Start difference. First operand 1977 states and 2747 transitions. Second operand has 6 states, 6 states have (on average 32.166666666666664) internal successors, (193), 6 states have internal predecessors, (193), 2 states have call successors, (54), 2 states have call predecessors, (54), 2 states have return successors, (52), 2 states have call predecessors, (52), 2 states have call successors, (52) [2021-11-12 23:36:33,690 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:36:35,703 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:36:37,719 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:36:38,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:36:38,245 INFO L93 Difference]: Finished difference Result 4023 states and 5633 transitions. [2021-11-12 23:36:38,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 23:36:38,246 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 32.166666666666664) internal successors, (193), 6 states have internal predecessors, (193), 2 states have call successors, (54), 2 states have call predecessors, (54), 2 states have return successors, (52), 2 states have call predecessors, (52), 2 states have call successors, (52) Word has length 293 [2021-11-12 23:36:38,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:36:38,254 INFO L225 Difference]: With dead ends: 4023 [2021-11-12 23:36:38,254 INFO L226 Difference]: Without dead ends: 2049 [2021-11-12 23:36:38,260 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 585 GetRequests, 580 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:36:38,261 INFO L933 BasicCegarLoop]: 891 mSDtfsCounter, 72 mSDsluCounter, 2661 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 17 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6263.35ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 3552 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.56ms SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6322.98ms IncrementalHoareTripleChecker+Time [2021-11-12 23:36:38,261 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 3552 Invalid, 42 Unknown, 0 Unchecked, 4.56ms Time], IncrementalHoareTripleChecker [17 Valid, 22 Invalid, 3 Unknown, 0 Unchecked, 6322.98ms Time] [2021-11-12 23:36:38,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2049 states. [2021-11-12 23:36:38,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2049 to 1993. [2021-11-12 23:36:38,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1993 states, 1362 states have (on average 1.3069016152716593) internal successors, (1780), 1389 states have internal predecessors, (1780), 473 states have call successors, (473), 147 states have call predecessors, (473), 157 states have return successors, (516), 489 states have call predecessors, (516), 472 states have call successors, (516) [2021-11-12 23:36:38,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1993 states to 1993 states and 2769 transitions. [2021-11-12 23:36:38,424 INFO L78 Accepts]: Start accepts. Automaton has 1993 states and 2769 transitions. Word has length 293 [2021-11-12 23:36:38,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:36:38,424 INFO L470 AbstractCegarLoop]: Abstraction has 1993 states and 2769 transitions. [2021-11-12 23:36:38,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 32.166666666666664) internal successors, (193), 6 states have internal predecessors, (193), 2 states have call successors, (54), 2 states have call predecessors, (54), 2 states have return successors, (52), 2 states have call predecessors, (52), 2 states have call successors, (52) [2021-11-12 23:36:38,425 INFO L276 IsEmpty]: Start isEmpty. Operand 1993 states and 2769 transitions. [2021-11-12 23:36:38,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2021-11-12 23:36:38,448 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:36:38,449 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 6, 6, 6, 6, 6, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:36:38,501 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (33)] Ended with exit code 0 [2021-11-12 23:36:38,661 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:36:38,662 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:36:38,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:36:38,662 INFO L85 PathProgramCache]: Analyzing trace with hash 1269251881, now seen corresponding path program 1 times [2021-11-12 23:36:38,664 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:36:38,664 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [607913912] [2021-11-12 23:36:38,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:36:38,664 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:36:38,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:36:38,665 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:36:38,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-12 23:36:40,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:36:40,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 1658 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:36:40,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:36:43,374 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2021-11-12 23:36:43,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:36:44,869 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 280 trivial. 0 not checked. [2021-11-12 23:36:44,869 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:36:44,869 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [607913912] [2021-11-12 23:36:44,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [607913912] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:36:44,870 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:36:44,870 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-12 23:36:44,870 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129961543] [2021-11-12 23:36:44,870 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:36:44,871 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:36:44,872 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:36:44,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:36:44,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:36:44,872 INFO L87 Difference]: Start difference. First operand 1993 states and 2769 transitions. Second operand has 4 states, 4 states have (on average 49.0) internal successors, (196), 4 states have internal predecessors, (196), 2 states have call successors, (55), 2 states have call predecessors, (55), 2 states have return successors, (53), 2 states have call predecessors, (53), 2 states have call successors, (53) [2021-11-12 23:36:46,897 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:36:48,912 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:36:49,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:36:49,273 INFO L93 Difference]: Finished difference Result 3999 states and 5591 transitions. [2021-11-12 23:36:49,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:36:49,273 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 49.0) internal successors, (196), 4 states have internal predecessors, (196), 2 states have call successors, (55), 2 states have call predecessors, (55), 2 states have return successors, (53), 2 states have call predecessors, (53), 2 states have call successors, (53) Word has length 306 [2021-11-12 23:36:49,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:36:49,283 INFO L225 Difference]: With dead ends: 3999 [2021-11-12 23:36:49,284 INFO L226 Difference]: Without dead ends: 2009 [2021-11-12 23:36:49,292 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 610 GetRequests, 608 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:36:49,292 INFO L933 BasicCegarLoop]: 883 mSDtfsCounter, 4 mSDsluCounter, 1748 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 7 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4201.04ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 2631 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.05ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4244.28ms IncrementalHoareTripleChecker+Time [2021-11-12 23:36:49,293 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 2631 Invalid, 25 Unknown, 0 Unchecked, 4.05ms Time], IncrementalHoareTripleChecker [7 Valid, 16 Invalid, 2 Unknown, 0 Unchecked, 4244.28ms Time] [2021-11-12 23:36:49,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2009 states. [2021-11-12 23:36:49,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2009 to 2009. [2021-11-12 23:36:49,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2009 states, 1374 states have (on average 1.304221251819505) internal successors, (1792), 1401 states have internal predecessors, (1792), 477 states have call successors, (477), 147 states have call predecessors, (477), 157 states have return successors, (520), 493 states have call predecessors, (520), 476 states have call successors, (520) [2021-11-12 23:36:49,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2009 states to 2009 states and 2789 transitions. [2021-11-12 23:36:49,488 INFO L78 Accepts]: Start accepts. Automaton has 2009 states and 2789 transitions. Word has length 306 [2021-11-12 23:36:49,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:36:49,489 INFO L470 AbstractCegarLoop]: Abstraction has 2009 states and 2789 transitions. [2021-11-12 23:36:49,489 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 49.0) internal successors, (196), 4 states have internal predecessors, (196), 2 states have call successors, (55), 2 states have call predecessors, (55), 2 states have return successors, (53), 2 states have call predecessors, (53), 2 states have call successors, (53) [2021-11-12 23:36:49,489 INFO L276 IsEmpty]: Start isEmpty. Operand 2009 states and 2789 transitions. [2021-11-12 23:36:49,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2021-11-12 23:36:49,495 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:36:49,495 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 8, 8, 8, 8, 8, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:36:49,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-12 23:36:49,709 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:36:49,709 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:36:49,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:36:49,710 INFO L85 PathProgramCache]: Analyzing trace with hash -324124157, now seen corresponding path program 1 times [2021-11-12 23:36:49,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:36:49,712 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1776453807] [2021-11-12 23:36:49,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:36:49,712 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:36:49,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:36:49,714 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:36:49,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-12 23:36:51,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:36:51,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 1711 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:36:51,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:36:54,885 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 173 proven. 5 refuted. 0 times theorem prover too weak. 232 trivial. 0 not checked. [2021-11-12 23:36:54,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:36:56,807 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 402 trivial. 0 not checked. [2021-11-12 23:36:56,807 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:36:56,807 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1776453807] [2021-11-12 23:36:56,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1776453807] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:36:56,807 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [471774668] [2021-11-12 23:36:56,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:36:56,807 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:36:56,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:36:56,808 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:36:56,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-12 23:36:57,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:36:57,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 1711 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 23:36:57,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:37:00,133 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2021-11-12 23:37:00,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:37:04,710 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 407 trivial. 0 not checked. [2021-11-12 23:37:04,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [471774668] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:37:04,710 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:37:04,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [5, 5, 9] total 20 [2021-11-12 23:37:04,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603546081] [2021-11-12 23:37:04,711 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:37:04,711 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-12 23:37:04,711 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:37:04,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-12 23:37:04,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=329, Unknown=0, NotChecked=0, Total=380 [2021-11-12 23:37:04,712 INFO L87 Difference]: Start difference. First operand 2009 states and 2789 transitions. Second operand has 7 states, 7 states have (on average 19.0) internal successors, (133), 5 states have internal predecessors, (133), 2 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (32), 4 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 23:37:05,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:37:05,511 INFO L93 Difference]: Finished difference Result 4526 states and 6402 transitions. [2021-11-12 23:37:05,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-12 23:37:05,511 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 19.0) internal successors, (133), 5 states have internal predecessors, (133), 2 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (32), 4 states have call predecessors, (32), 2 states have call successors, (32) Word has length 326 [2021-11-12 23:37:05,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:37:05,523 INFO L225 Difference]: With dead ends: 4526 [2021-11-12 23:37:05,523 INFO L226 Difference]: Without dead ends: 2520 [2021-11-12 23:37:05,528 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1301 GetRequests, 1282 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=55, Invalid=365, Unknown=0, NotChecked=0, Total=420 [2021-11-12 23:37:05,529 INFO L933 BasicCegarLoop]: 1166 mSDtfsCounter, 232 mSDsluCounter, 5578 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 333.94ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 291 SdHoareTripleChecker+Valid, 6744 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.02ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 349.30ms IncrementalHoareTripleChecker+Time [2021-11-12 23:37:05,530 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [291 Valid, 6744 Invalid, 33 Unknown, 0 Unchecked, 7.02ms Time], IncrementalHoareTripleChecker [3 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 349.30ms Time] [2021-11-12 23:37:05,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2520 states. [2021-11-12 23:37:05,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2520 to 2009. [2021-11-12 23:37:05,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2009 states, 1374 states have (on average 1.304221251819505) internal successors, (1792), 1401 states have internal predecessors, (1792), 477 states have call successors, (477), 147 states have call predecessors, (477), 157 states have return successors, (520), 493 states have call predecessors, (520), 476 states have call successors, (520) [2021-11-12 23:37:05,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2009 states to 2009 states and 2789 transitions. [2021-11-12 23:37:05,724 INFO L78 Accepts]: Start accepts. Automaton has 2009 states and 2789 transitions. Word has length 326 [2021-11-12 23:37:05,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:37:05,725 INFO L470 AbstractCegarLoop]: Abstraction has 2009 states and 2789 transitions. [2021-11-12 23:37:05,725 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 19.0) internal successors, (133), 5 states have internal predecessors, (133), 2 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (32), 4 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 23:37:05,725 INFO L276 IsEmpty]: Start isEmpty. Operand 2009 states and 2789 transitions. [2021-11-12 23:37:05,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 329 [2021-11-12 23:37:05,731 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:37:05,731 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 8, 8, 8, 8, 8, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:37:05,784 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-12 23:37:05,959 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2021-11-12 23:37:06,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:37:06,146 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:37:06,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:37:06,146 INFO L85 PathProgramCache]: Analyzing trace with hash -109598007, now seen corresponding path program 1 times [2021-11-12 23:37:06,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:37:06,149 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [251937595] [2021-11-12 23:37:06,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:37:06,149 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:37:06,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:37:06,150 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:37:06,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-12 23:37:08,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:37:08,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 1716 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:37:08,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:37:11,176 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 173 proven. 5 refuted. 0 times theorem prover too weak. 232 trivial. 0 not checked. [2021-11-12 23:37:11,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:37:12,981 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 402 trivial. 0 not checked. [2021-11-12 23:37:12,981 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:37:12,981 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [251937595] [2021-11-12 23:37:12,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [251937595] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:37:12,981 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1740197696] [2021-11-12 23:37:12,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:37:12,981 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:37:12,982 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:37:12,991 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:37:12,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-12 23:37:13,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:37:13,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 1716 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 23:37:13,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:37:16,288 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2021-11-12 23:37:16,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:37:20,618 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 407 trivial. 0 not checked. [2021-11-12 23:37:20,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1740197696] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:37:20,618 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:37:20,619 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [5, 5, 9] total 20 [2021-11-12 23:37:20,619 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815465002] [2021-11-12 23:37:20,619 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:37:20,620 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-12 23:37:20,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:37:20,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-12 23:37:20,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=329, Unknown=0, NotChecked=0, Total=380 [2021-11-12 23:37:20,620 INFO L87 Difference]: Start difference. First operand 2009 states and 2789 transitions. Second operand has 7 states, 7 states have (on average 19.285714285714285) internal successors, (135), 5 states have internal predecessors, (135), 2 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (32), 4 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 23:37:21,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:37:21,336 INFO L93 Difference]: Finished difference Result 4538 states and 6414 transitions. [2021-11-12 23:37:21,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-12 23:37:21,339 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 19.285714285714285) internal successors, (135), 5 states have internal predecessors, (135), 2 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (32), 4 states have call predecessors, (32), 2 states have call successors, (32) Word has length 328 [2021-11-12 23:37:21,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:37:21,350 INFO L225 Difference]: With dead ends: 4538 [2021-11-12 23:37:21,350 INFO L226 Difference]: Without dead ends: 2532 [2021-11-12 23:37:21,354 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1309 GetRequests, 1290 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=55, Invalid=365, Unknown=0, NotChecked=0, Total=420 [2021-11-12 23:37:21,355 INFO L933 BasicCegarLoop]: 1161 mSDtfsCounter, 232 mSDsluCounter, 5554 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 301.15ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 291 SdHoareTripleChecker+Valid, 6715 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.38ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 308.18ms IncrementalHoareTripleChecker+Time [2021-11-12 23:37:21,355 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [291 Valid, 6715 Invalid, 33 Unknown, 0 Unchecked, 6.38ms Time], IncrementalHoareTripleChecker [3 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 308.18ms Time] [2021-11-12 23:37:21,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2532 states. [2021-11-12 23:37:21,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2532 to 2005. [2021-11-12 23:37:21,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2005 states, 1372 states have (on average 1.30466472303207) internal successors, (1790), 1397 states have internal predecessors, (1790), 477 states have call successors, (477), 147 states have call predecessors, (477), 155 states have return successors, (512), 493 states have call predecessors, (512), 476 states have call successors, (512) [2021-11-12 23:37:21,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2005 states to 2005 states and 2779 transitions. [2021-11-12 23:37:21,558 INFO L78 Accepts]: Start accepts. Automaton has 2005 states and 2779 transitions. Word has length 328 [2021-11-12 23:37:21,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:37:21,559 INFO L470 AbstractCegarLoop]: Abstraction has 2005 states and 2779 transitions. [2021-11-12 23:37:21,560 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 19.285714285714285) internal successors, (135), 5 states have internal predecessors, (135), 2 states have call successors, (34), 2 states have call predecessors, (34), 3 states have return successors, (32), 4 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 23:37:21,561 INFO L276 IsEmpty]: Start isEmpty. Operand 2005 states and 2779 transitions. [2021-11-12 23:37:21,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 700 [2021-11-12 23:37:21,569 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:37:21,570 INFO L514 BasicCegarLoop]: trace histogram [27, 27, 20, 20, 20, 20, 20, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:37:21,581 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (38)] Forceful destruction successful, exit code 0 [2021-11-12 23:37:21,822 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-12 23:37:21,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:37:21,984 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:37:21,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:37:21,985 INFO L85 PathProgramCache]: Analyzing trace with hash 641148264, now seen corresponding path program 1 times [2021-11-12 23:37:21,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:37:21,988 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1902582178] [2021-11-12 23:37:21,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:37:21,988 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:37:21,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:37:21,990 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:37:22,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-12 23:37:24,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:37:24,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 2850 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:37:24,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:37:31,649 INFO L134 CoverageAnalysis]: Checked inductivity of 2948 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2945 trivial. 0 not checked. [2021-11-12 23:37:31,650 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:37:34,261 INFO L134 CoverageAnalysis]: Checked inductivity of 2948 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2945 trivial. 0 not checked. [2021-11-12 23:37:34,261 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:37:34,261 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1902582178] [2021-11-12 23:37:34,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1902582178] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:37:34,262 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [838441850] [2021-11-12 23:37:34,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:37:34,262 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:37:34,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:37:34,263 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:37:34,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-12 23:37:35,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:37:35,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 2850 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-12 23:37:35,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:37:41,201 INFO L134 CoverageAnalysis]: Checked inductivity of 2948 backedges. 1530 proven. 2 refuted. 0 times theorem prover too weak. 1416 trivial. 0 not checked. [2021-11-12 23:37:41,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:37:46,866 INFO L134 CoverageAnalysis]: Checked inductivity of 2948 backedges. 2 proven. 26 refuted. 0 times theorem prover too weak. 2920 trivial. 0 not checked. [2021-11-12 23:37:46,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [838441850] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:37:46,866 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038508218] [2021-11-12 23:37:46,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:37:46,867 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:37:46,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:37:46,869 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:37:46,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-12 23:37:47,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:37:47,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 2850 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-12 23:37:47,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:37:52,919 INFO L134 CoverageAnalysis]: Checked inductivity of 2948 backedges. 1530 proven. 2 refuted. 0 times theorem prover too weak. 1416 trivial. 0 not checked. [2021-11-12 23:37:52,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:37:57,263 INFO L134 CoverageAnalysis]: Checked inductivity of 2948 backedges. 2 proven. 26 refuted. 0 times theorem prover too weak. 2920 trivial. 0 not checked. [2021-11-12 23:37:57,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2038508218] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:37:57,263 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 23:37:57,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 8, 8, 8, 8] total 18 [2021-11-12 23:37:57,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962016087] [2021-11-12 23:37:57,264 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 23:37:57,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-12 23:37:57,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:37:57,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-12 23:37:57,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2021-11-12 23:37:57,269 INFO L87 Difference]: Start difference. First operand 2005 states and 2779 transitions. Second operand has 18 states, 18 states have (on average 16.11111111111111) internal successors, (290), 14 states have internal predecessors, (290), 4 states have call successors, (84), 2 states have call predecessors, (84), 6 states have return successors, (87), 8 states have call predecessors, (87), 4 states have call successors, (87) [2021-11-12 23:38:00,012 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:38:03,140 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:38:05,517 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:38:07,540 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:38:09,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:38:09,870 INFO L93 Difference]: Finished difference Result 4212 states and 5948 transitions. [2021-11-12 23:38:09,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-12 23:38:09,870 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 16.11111111111111) internal successors, (290), 14 states have internal predecessors, (290), 4 states have call successors, (84), 2 states have call predecessors, (84), 6 states have return successors, (87), 8 states have call predecessors, (87), 4 states have call successors, (87) Word has length 699 [2021-11-12 23:38:09,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:38:09,879 INFO L225 Difference]: With dead ends: 4212 [2021-11-12 23:38:09,879 INFO L226 Difference]: Without dead ends: 2210 [2021-11-12 23:38:09,885 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4190 GetRequests, 4172 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2021-11-12 23:38:09,885 INFO L933 BasicCegarLoop]: 886 mSDtfsCounter, 47 mSDsluCounter, 13240 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 15 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11554.68ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 14126 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 12.37ms SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11863.34ms IncrementalHoareTripleChecker+Time [2021-11-12 23:38:09,886 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 14126 Invalid, 230 Unknown, 0 Unchecked, 12.37ms Time], IncrementalHoareTripleChecker [15 Valid, 211 Invalid, 4 Unknown, 0 Unchecked, 11863.34ms Time] [2021-11-12 23:38:09,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2210 states. [2021-11-12 23:38:10,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2210 to 2158. [2021-11-12 23:38:10,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2158 states, 1493 states have (on average 1.2933690555927662) internal successors, (1931), 1508 states have internal predecessors, (1931), 500 states have call successors, (500), 147 states have call predecessors, (500), 164 states have return successors, (577), 531 states have call predecessors, (577), 499 states have call successors, (577) [2021-11-12 23:38:10,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2158 states to 2158 states and 3008 transitions. [2021-11-12 23:38:10,104 INFO L78 Accepts]: Start accepts. Automaton has 2158 states and 3008 transitions. Word has length 699 [2021-11-12 23:38:10,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:38:10,104 INFO L470 AbstractCegarLoop]: Abstraction has 2158 states and 3008 transitions. [2021-11-12 23:38:10,105 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 16.11111111111111) internal successors, (290), 14 states have internal predecessors, (290), 4 states have call successors, (84), 2 states have call predecessors, (84), 6 states have return successors, (87), 8 states have call predecessors, (87), 4 states have call successors, (87) [2021-11-12 23:38:10,105 INFO L276 IsEmpty]: Start isEmpty. Operand 2158 states and 3008 transitions. [2021-11-12 23:38:10,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 690 [2021-11-12 23:38:10,115 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:38:10,115 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 16, 16, 16, 16, 16, 10, 10, 10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:38:10,124 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (40)] Forceful destruction successful, exit code 0 [2021-11-12 23:38:10,371 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-11-12 23:38:10,570 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-12 23:38:10,724 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:38:10,725 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:38:10,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:38:10,725 INFO L85 PathProgramCache]: Analyzing trace with hash -2055512906, now seen corresponding path program 1 times [2021-11-12 23:38:10,728 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:38:10,729 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [592557881] [2021-11-12 23:38:10,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:38:10,729 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:38:10,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:38:10,730 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:38:10,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-12 23:38:13,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:38:13,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 2871 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 23:38:13,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:38:23,683 INFO L134 CoverageAnalysis]: Checked inductivity of 2456 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 2436 trivial. 0 not checked. [2021-11-12 23:38:23,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:38:27,187 INFO L134 CoverageAnalysis]: Checked inductivity of 2456 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 2436 trivial. 0 not checked. [2021-11-12 23:38:27,188 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:38:27,188 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [592557881] [2021-11-12 23:38:27,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [592557881] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:38:27,188 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [582894293] [2021-11-12 23:38:27,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:38:27,188 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:38:27,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:38:27,189 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:38:27,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-11-12 23:38:28,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:38:28,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 2871 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:38:28,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:38:35,879 INFO L134 CoverageAnalysis]: Checked inductivity of 2456 backedges. 1120 proven. 2 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2021-11-12 23:38:35,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:38:40,653 INFO L134 CoverageAnalysis]: Checked inductivity of 2456 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 2432 trivial. 0 not checked. [2021-11-12 23:38:40,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [582894293] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:38:40,654 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [287617300] [2021-11-12 23:38:40,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:38:40,654 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:38:40,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:38:40,655 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:38:40,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-12 23:38:41,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:38:41,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 2871 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:38:41,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:38:48,516 INFO L134 CoverageAnalysis]: Checked inductivity of 2456 backedges. 1120 proven. 2 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2021-11-12 23:38:48,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:38:53,109 INFO L134 CoverageAnalysis]: Checked inductivity of 2456 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 2432 trivial. 0 not checked. [2021-11-12 23:38:53,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [287617300] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:38:53,109 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 23:38:53,110 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 5, 5, 5, 5] total 13 [2021-11-12 23:38:53,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149683606] [2021-11-12 23:38:53,111 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 23:38:53,113 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-12 23:38:53,113 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:38:53,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-12 23:38:53,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-11-12 23:38:53,113 INFO L87 Difference]: Start difference. First operand 2158 states and 3008 transitions. Second operand has 13 states, 13 states have (on average 26.076923076923077) internal successors, (339), 12 states have internal predecessors, (339), 3 states have call successors, (105), 2 states have call predecessors, (105), 3 states have return successors, (107), 4 states have call predecessors, (107), 3 states have call successors, (107) [2021-11-12 23:38:55,621 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:38:58,328 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:39:01,266 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:39:04,320 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:39:05,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:39:05,456 INFO L93 Difference]: Finished difference Result 4500 states and 6449 transitions. [2021-11-12 23:39:05,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-12 23:39:05,456 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 26.076923076923077) internal successors, (339), 12 states have internal predecessors, (339), 3 states have call successors, (105), 2 states have call predecessors, (105), 3 states have return successors, (107), 4 states have call predecessors, (107), 3 states have call successors, (107) Word has length 689 [2021-11-12 23:39:05,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:39:05,467 INFO L225 Difference]: With dead ends: 4500 [2021-11-12 23:39:05,468 INFO L226 Difference]: Without dead ends: 2345 [2021-11-12 23:39:05,474 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4128 GetRequests, 4117 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-11-12 23:39:05,474 INFO L933 BasicCegarLoop]: 917 mSDtfsCounter, 55 mSDsluCounter, 9037 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 8 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11960.03ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 9954 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.40ms SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12169.29ms IncrementalHoareTripleChecker+Time [2021-11-12 23:39:05,475 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 9954 Invalid, 201 Unknown, 0 Unchecked, 9.40ms Time], IncrementalHoareTripleChecker [8 Valid, 189 Invalid, 4 Unknown, 0 Unchecked, 12169.29ms Time] [2021-11-12 23:39:05,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2345 states. [2021-11-12 23:39:05,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2345 to 2318. [2021-11-12 23:39:05,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2318 states, 1601 states have (on average 1.2916926920674578) internal successors, (2068), 1617 states have internal predecessors, (2068), 552 states have call successors, (552), 147 states have call predecessors, (552), 164 states have return successors, (638), 592 states have call predecessors, (638), 551 states have call successors, (638) [2021-11-12 23:39:05,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2318 states to 2318 states and 3258 transitions. [2021-11-12 23:39:05,758 INFO L78 Accepts]: Start accepts. Automaton has 2318 states and 3258 transitions. Word has length 689 [2021-11-12 23:39:05,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:39:05,759 INFO L470 AbstractCegarLoop]: Abstraction has 2318 states and 3258 transitions. [2021-11-12 23:39:05,759 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 26.076923076923077) internal successors, (339), 12 states have internal predecessors, (339), 3 states have call successors, (105), 2 states have call predecessors, (105), 3 states have return successors, (107), 4 states have call predecessors, (107), 3 states have call successors, (107) [2021-11-12 23:39:05,759 INFO L276 IsEmpty]: Start isEmpty. Operand 2318 states and 3258 transitions. [2021-11-12 23:39:05,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 719 [2021-11-12 23:39:05,786 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:39:05,787 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 16, 16, 16, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 8, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:39:05,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-12 23:39:06,009 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (43)] Forceful destruction successful, exit code 0 [2021-11-12 23:39:06,262 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-11-12 23:39:06,388 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:39:06,388 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:39:06,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:39:06,389 INFO L85 PathProgramCache]: Analyzing trace with hash 891316907, now seen corresponding path program 1 times [2021-11-12 23:39:06,391 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:39:06,391 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1354820599] [2021-11-12 23:39:06,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:39:06,391 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:39:06,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:39:06,392 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:39:06,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-12 23:39:09,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:39:09,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 3054 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:39:09,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:39:18,705 INFO L134 CoverageAnalysis]: Checked inductivity of 2535 backedges. 474 proven. 5 refuted. 0 times theorem prover too weak. 2056 trivial. 0 not checked. [2021-11-12 23:39:18,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:39:21,908 INFO L134 CoverageAnalysis]: Checked inductivity of 2535 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 2528 trivial. 0 not checked. [2021-11-12 23:39:21,908 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:39:21,908 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1354820599] [2021-11-12 23:39:21,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1354820599] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:39:21,909 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [687295589] [2021-11-12 23:39:21,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:39:21,909 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:39:21,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:39:21,910 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:39:21,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-12 23:39:23,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:39:23,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 3054 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:39:23,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:39:29,947 INFO L134 CoverageAnalysis]: Checked inductivity of 2535 backedges. 1259 proven. 0 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2021-11-12 23:39:29,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:39:33,149 INFO L134 CoverageAnalysis]: Checked inductivity of 2535 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 2528 trivial. 0 not checked. [2021-11-12 23:39:33,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [687295589] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:39:33,150 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:39:33,151 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 5, 3] total 10 [2021-11-12 23:39:33,151 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774941517] [2021-11-12 23:39:33,151 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:39:33,151 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:39:33,151 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:39:33,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:39:33,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:39:33,152 INFO L87 Difference]: Start difference. First operand 2318 states and 3258 transitions. Second operand has 3 states, 3 states have (on average 72.0) internal successors, (216), 3 states have internal predecessors, (216), 2 states have call successors, (64), 2 states have call predecessors, (64), 2 states have return successors, (62), 2 states have call predecessors, (62), 2 states have call successors, (62) [2021-11-12 23:39:33,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:39:33,416 INFO L93 Difference]: Finished difference Result 4669 states and 6601 transitions. [2021-11-12 23:39:33,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:39:33,417 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 72.0) internal successors, (216), 3 states have internal predecessors, (216), 2 states have call successors, (64), 2 states have call predecessors, (64), 2 states have return successors, (62), 2 states have call predecessors, (62), 2 states have call successors, (62) Word has length 718 [2021-11-12 23:39:33,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:39:33,428 INFO L225 Difference]: With dead ends: 4669 [2021-11-12 23:39:33,429 INFO L226 Difference]: Without dead ends: 2354 [2021-11-12 23:39:33,435 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2868 GetRequests, 2860 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:39:33,436 INFO L933 BasicCegarLoop]: 884 mSDtfsCounter, 9 mSDsluCounter, 880 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 87.70ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 1764 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.80ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 91.32ms IncrementalHoareTripleChecker+Time [2021-11-12 23:39:33,437 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 1764 Invalid, 6 Unknown, 0 Unchecked, 1.80ms Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 91.32ms Time] [2021-11-12 23:39:33,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2354 states. [2021-11-12 23:39:33,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2354 to 2342. [2021-11-12 23:39:33,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2342 states, 1625 states have (on average 1.2947692307692307) internal successors, (2104), 1641 states have internal predecessors, (2104), 552 states have call successors, (552), 147 states have call predecessors, (552), 164 states have return successors, (638), 592 states have call predecessors, (638), 551 states have call successors, (638) [2021-11-12 23:39:33,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2342 states to 2342 states and 3294 transitions. [2021-11-12 23:39:33,778 INFO L78 Accepts]: Start accepts. Automaton has 2342 states and 3294 transitions. Word has length 718 [2021-11-12 23:39:33,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:39:33,780 INFO L470 AbstractCegarLoop]: Abstraction has 2342 states and 3294 transitions. [2021-11-12 23:39:33,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 72.0) internal successors, (216), 3 states have internal predecessors, (216), 2 states have call successors, (64), 2 states have call predecessors, (64), 2 states have return successors, (62), 2 states have call predecessors, (62), 2 states have call successors, (62) [2021-11-12 23:39:33,780 INFO L276 IsEmpty]: Start isEmpty. Operand 2342 states and 3294 transitions. [2021-11-12 23:39:33,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 695 [2021-11-12 23:39:33,790 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:39:33,790 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 16, 16, 16, 16, 16, 10, 10, 10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:39:33,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2021-11-12 23:39:34,027 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (46)] Forceful destruction successful, exit code 0 [2021-11-12 23:39:34,213 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:39:34,214 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:39:34,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:39:34,215 INFO L85 PathProgramCache]: Analyzing trace with hash 864427189, now seen corresponding path program 1 times [2021-11-12 23:39:34,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:39:34,218 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [779481323] [2021-11-12 23:39:34,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:39:34,218 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:39:34,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:39:34,220 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:39:34,259 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-12 23:39:36,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:39:37,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 2895 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:39:37,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:39:46,103 INFO L134 CoverageAnalysis]: Checked inductivity of 2472 backedges. 474 proven. 5 refuted. 0 times theorem prover too weak. 1993 trivial. 0 not checked. [2021-11-12 23:39:46,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:39:49,511 INFO L134 CoverageAnalysis]: Checked inductivity of 2472 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 2465 trivial. 0 not checked. [2021-11-12 23:39:49,512 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:39:49,512 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [779481323] [2021-11-12 23:39:49,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [779481323] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:39:49,512 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [141491958] [2021-11-12 23:39:49,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:39:49,512 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:39:49,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:39:49,513 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:39:49,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2021-11-12 23:39:50,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:39:50,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 2895 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:39:50,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:39:52,129 INFO L134 CoverageAnalysis]: Checked inductivity of 2472 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2472 trivial. 0 not checked. [2021-11-12 23:39:52,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:39:54,413 INFO L134 CoverageAnalysis]: Checked inductivity of 2472 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2472 trivial. 0 not checked. [2021-11-12 23:39:54,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [141491958] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:39:54,413 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:39:54,414 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-12 23:39:54,415 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461804820] [2021-11-12 23:39:54,415 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:39:54,416 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:39:54,416 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:39:54,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:39:54,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:39:54,417 INFO L87 Difference]: Start difference. First operand 2342 states and 3294 transitions. Second operand has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 3 states have internal predecessors, (172), 3 states have call successors, (50), 3 states have call predecessors, (50), 2 states have return successors, (48), 2 states have call predecessors, (48), 2 states have call successors, (48) [2021-11-12 23:39:56,487 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:39:56,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:39:56,705 INFO L93 Difference]: Finished difference Result 2342 states and 3294 transitions. [2021-11-12 23:39:56,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:39:56,705 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 3 states have internal predecessors, (172), 3 states have call successors, (50), 3 states have call predecessors, (50), 2 states have return successors, (48), 2 states have call predecessors, (48), 2 states have call successors, (48) Word has length 694 [2021-11-12 23:39:56,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:39:56,707 INFO L225 Difference]: With dead ends: 2342 [2021-11-12 23:39:56,707 INFO L226 Difference]: Without dead ends: 0 [2021-11-12 23:39:56,712 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2772 GetRequests, 2765 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:39:56,713 INFO L933 BasicCegarLoop]: 1191 mSDtfsCounter, 365 mSDsluCounter, 817 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2120.18ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 365 SdHoareTripleChecker+Valid, 2008 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.95ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2144.63ms IncrementalHoareTripleChecker+Time [2021-11-12 23:39:56,714 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [365 Valid, 2008 Invalid, 5 Unknown, 0 Unchecked, 2.95ms Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 1 Unknown, 0 Unchecked, 2144.63ms Time] [2021-11-12 23:39:56,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-11-12 23:39:56,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-11-12 23:39:56,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 23:39:56,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-11-12 23:39:56,715 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 694 [2021-11-12 23:39:56,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:39:56,716 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-11-12 23:39:56,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 3 states have internal predecessors, (172), 3 states have call successors, (50), 3 states have call predecessors, (50), 2 states have return successors, (48), 2 states have call predecessors, (48), 2 states have call successors, (48) [2021-11-12 23:39:56,716 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-11-12 23:39:56,717 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-11-12 23:39:56,719 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-12 23:39:56,733 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (48)] Forceful destruction successful, exit code 0 [2021-11-12 23:39:56,994 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (47)] Forceful destruction successful, exit code 0 [2021-11-12 23:39:57,149 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9b9aba9-848c-45a8-812f-4240d4a4e3e2/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:39:57,151 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-11-12 23:43:33,758 WARN L227 SmtUtils]: Spent 6.26s on a formula simplification. DAG size of input: 141 DAG size of output: 15 (called from [L 149] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.combineInter)