./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memcleanup.prp --file ../../sv-benchmarks/c/verifythis/tree_max.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (memcleanup) Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/verifythis/tree_max.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/config/svcomp-MemCleanup-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-memcleanup) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:13:08,757 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:13:08,759 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:13:08,796 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:13:08,796 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:13:08,798 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:13:08,800 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:13:08,802 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:13:08,805 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:13:08,806 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:13:08,808 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:13:08,809 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:13:08,813 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:13:08,817 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:13:08,819 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:13:08,823 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:13:08,826 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:13:08,828 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:13:08,830 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:13:08,833 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:13:08,835 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:13:08,842 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:13:08,844 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:13:08,846 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:13:08,851 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:13:08,851 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:13:08,852 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:13:08,853 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:13:08,854 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:13:08,855 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:13:08,855 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:13:08,857 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:13:08,858 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:13:08,859 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:13:08,860 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:13:08,861 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:13:08,862 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:13:08,862 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:13:08,862 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:13:08,864 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:13:08,865 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:13:08,869 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/config/svcomp-MemCleanup-32bit-Taipan_Default.epf [2021-11-25 20:13:08,915 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:13:08,915 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:13:08,915 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:13:08,916 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:13:08,916 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:13:08,917 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:13:08,917 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:13:08,917 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:13:08,917 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:13:08,918 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:13:08,918 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:13:08,918 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:13:08,918 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:13:08,919 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:13:08,919 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:13:08,919 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:13:08,919 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:13:08,920 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:13:08,921 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-25 20:13:08,921 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-25 20:13:08,921 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:13:08,921 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:13:08,922 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-25 20:13:08,922 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:13:08,922 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:13:08,922 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:13:08,923 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-25 20:13:08,923 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-25 20:13:08,923 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:13:08,924 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 20:13:08,924 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:13:08,924 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:13:08,924 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:13:08,925 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:13:08,925 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:13:08,925 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:13:08,925 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:13:08,926 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:13:08,926 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:13:08,926 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:13:08,926 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:13:08,927 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_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c [2021-11-25 20:13:09,215 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:13:09,247 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:13:09,250 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:13:09,251 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:13:09,252 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:13:09,253 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/verifythis/tree_max.c [2021-11-25 20:13:09,348 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/data/b3034d0c8/8adcda5a3fb44202814377280d78c190/FLAG7ce756c4c [2021-11-25 20:13:09,853 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:13:09,854 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/sv-benchmarks/c/verifythis/tree_max.c [2021-11-25 20:13:09,863 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/data/b3034d0c8/8adcda5a3fb44202814377280d78c190/FLAG7ce756c4c [2021-11-25 20:13:10,225 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/data/b3034d0c8/8adcda5a3fb44202814377280d78c190 [2021-11-25 20:13:10,227 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:13:10,229 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:13:10,230 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:13:10,230 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:13:10,234 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:13:10,235 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:13:10" (1/1) ... [2021-11-25 20:13:10,236 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c012d0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:10, skipping insertion in model container [2021-11-25 20:13:10,237 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:13:10" (1/1) ... [2021-11-25 20:13:10,252 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:13:10,277 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:13:10,432 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2021-11-25 20:13:10,450 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:13:10,462 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) [2021-11-25 20:13:10,463 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@5fce389 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:10, skipping insertion in model container [2021-11-25 20:13:10,463 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:13:10,464 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-25 20:13:10,466 INFO L158 Benchmark]: Toolchain (without parser) took 236.20ms. Allocated memory is still 100.7MB. Free memory was 64.3MB in the beginning and 77.2MB in the end (delta: -12.9MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-25 20:13:10,467 INFO L158 Benchmark]: CDTParser took 0.25ms. Allocated memory is still 100.7MB. Free memory was 70.3MB in the beginning and 70.2MB in the end (delta: 29.9kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 20:13:10,469 INFO L158 Benchmark]: CACSL2BoogieTranslator took 233.61ms. Allocated memory is still 100.7MB. Free memory was 64.2MB in the beginning and 77.2MB in the end (delta: -13.0MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-25 20:13:10,471 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25ms. Allocated memory is still 100.7MB. Free memory was 70.3MB in the beginning and 70.2MB in the end (delta: 29.9kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 233.61ms. Allocated memory is still 100.7MB. Free memory was 64.2MB in the beginning and 77.2MB in the end (delta: -13.0MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 27]: 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_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/verifythis/tree_max.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/config/svcomp-MemCleanup-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-memcleanup) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:13:12,949 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:13:12,952 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:13:12,994 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:13:12,995 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:13:13,000 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:13:13,003 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:13:13,007 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:13:13,011 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:13:13,019 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:13:13,020 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:13:13,022 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:13:13,023 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:13:13,026 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:13:13,028 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:13:13,030 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:13:13,032 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:13:13,033 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:13:13,037 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:13:13,042 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:13:13,045 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:13:13,046 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:13:13,050 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:13:13,051 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:13:13,062 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:13:13,063 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:13:13,064 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:13:13,065 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:13:13,065 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:13:13,066 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:13:13,066 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:13:13,067 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:13:13,068 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:13:13,069 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:13:13,070 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:13:13,070 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:13:13,084 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:13:13,085 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:13:13,085 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:13:13,086 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:13:13,087 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:13:13,087 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/config/svcomp-MemCleanup-32bit-Taipan_Bitvector.epf [2021-11-25 20:13:13,114 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:13:13,115 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:13:13,115 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:13:13,115 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:13:13,116 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:13:13,116 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:13:13,117 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:13:13,117 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:13:13,117 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:13:13,117 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:13:13,118 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:13:13,118 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:13:13,119 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-25 20:13:13,119 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-25 20:13:13,119 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:13:13,120 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:13:13,120 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-25 20:13:13,120 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:13:13,120 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:13:13,120 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:13:13,121 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-25 20:13:13,121 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-25 20:13:13,121 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:13:13,121 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 20:13:13,122 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-25 20:13:13,122 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-25 20:13:13,122 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:13:13,122 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:13:13,123 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:13:13,123 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-25 20:13:13,123 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:13:13,123 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:13:13,124 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:13:13,124 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:13:13,124 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-25 20:13:13,124 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-25 20:13:13,125 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:13:13,125 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:13:13,125 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_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e98a60ea9ee0c00575c08606ce8b95d0660c5b235c5932147dfee4b13512f57c [2021-11-25 20:13:13,582 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:13:13,609 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:13:13,613 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:13:13,614 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:13:13,615 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:13:13,617 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/verifythis/tree_max.c [2021-11-25 20:13:13,694 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/data/46565fe20/06890e8595084d1dbc2b864696c6628a/FLAG348fc9fa8 [2021-11-25 20:13:14,233 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:13:14,237 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/sv-benchmarks/c/verifythis/tree_max.c [2021-11-25 20:13:14,245 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/data/46565fe20/06890e8595084d1dbc2b864696c6628a/FLAG348fc9fa8 [2021-11-25 20:13:14,584 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/data/46565fe20/06890e8595084d1dbc2b864696c6628a [2021-11-25 20:13:14,586 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:13:14,587 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:13:14,590 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:13:14,590 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:13:14,594 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:13:14,595 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:13:14" (1/1) ... [2021-11-25 20:13:14,596 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@11cdc1b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:14, skipping insertion in model container [2021-11-25 20:13:14,596 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:13:14" (1/1) ... [2021-11-25 20:13:14,603 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:13:14,617 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:13:14,803 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2021-11-25 20:13:14,821 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:13:14,835 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-25 20:13:14,840 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:13:14,844 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2021-11-25 20:13:14,855 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:13:14,863 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:13:14,876 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/sv-benchmarks/c/verifythis/tree_max.c[544,557] [2021-11-25 20:13:14,885 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:13:14,902 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:13:14,902 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:14 WrapperNode [2021-11-25 20:13:14,903 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:13:14,903 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:13:14,903 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:13:14,904 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:13:14,911 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:14" (1/1) ... [2021-11-25 20:13:14,922 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:14" (1/1) ... [2021-11-25 20:13:14,941 INFO L137 Inliner]: procedures = 26, calls = 28, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 37 [2021-11-25 20:13:14,941 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:13:14,942 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:13:14,942 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:13:14,943 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:13:14,950 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:14" (1/1) ... [2021-11-25 20:13:14,950 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:14" (1/1) ... [2021-11-25 20:13:14,954 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:14" (1/1) ... [2021-11-25 20:13:14,955 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:14" (1/1) ... [2021-11-25 20:13:14,965 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:14" (1/1) ... [2021-11-25 20:13:14,967 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:14" (1/1) ... [2021-11-25 20:13:14,969 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:14" (1/1) ... [2021-11-25 20:13:14,972 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:13:14,973 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:13:14,973 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:13:14,973 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:13:14,974 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:14" (1/1) ... [2021-11-25 20:13:14,981 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:13:14,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:15,012 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:13:15,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:13:15,049 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:13:15,049 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-25 20:13:15,050 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-25 20:13:15,050 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-25 20:13:15,050 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-25 20:13:15,050 INFO L130 BoogieDeclarations]: Found specification of procedure max [2021-11-25 20:13:15,050 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2021-11-25 20:13:15,051 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2021-11-25 20:13:15,051 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2021-11-25 20:13:15,051 INFO L130 BoogieDeclarations]: Found specification of procedure check [2021-11-25 20:13:15,051 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2021-11-25 20:13:15,051 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-25 20:13:15,051 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:13:15,052 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:13:15,052 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-25 20:13:15,127 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:13:15,131 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:13:15,579 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:13:15,596 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:13:15,596 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-25 20:13:15,599 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:13:15 BoogieIcfgContainer [2021-11-25 20:13:15,613 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:13:15,615 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:13:15,615 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:13:15,617 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:13:15,618 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:13:14" (1/3) ... [2021-11-25 20:13:15,619 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30597d01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:13:15, skipping insertion in model container [2021-11-25 20:13:15,619 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:13:14" (2/3) ... [2021-11-25 20:13:15,619 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30597d01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:13:15, skipping insertion in model container [2021-11-25 20:13:15,620 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:13:15" (3/3) ... [2021-11-25 20:13:15,621 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_max.c [2021-11-25 20:13:15,627 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:13:15,627 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 20 error locations. [2021-11-25 20:13:15,678 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:13:15,686 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2021-11-25 20:13:15,686 INFO L340 AbstractCegarLoop]: Starting to check reachability of 20 error locations. [2021-11-25 20:13:15,703 INFO L276 IsEmpty]: Start isEmpty. Operand has 72 states, 39 states have (on average 1.6923076923076923) internal successors, (66), 59 states have internal predecessors, (66), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 20:13:15,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-25 20:13:15,712 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:15,713 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-25 20:13:15,713 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting nondet_treeErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:13:15,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:15,720 INFO L85 PathProgramCache]: Analyzing trace with hash 73597257, now seen corresponding path program 1 times [2021-11-25 20:13:15,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:13:15,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [967879514] [2021-11-25 20:13:15,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:15,757 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:13:15,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:13:15,764 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:13:15,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-25 20:13:15,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:15,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:13:15,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:15,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:13:15,953 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:15,954 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:13:15,954 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:13:15,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [967879514] [2021-11-25 20:13:15,955 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [967879514] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:15,955 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:13:15,955 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:13:15,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522130985] [2021-11-25 20:13:15,958 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:15,962 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:13:15,962 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:13:15,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:13:15,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:13:15,995 INFO L87 Difference]: Start difference. First operand has 72 states, 39 states have (on average 1.6923076923076923) internal successors, (66), 59 states have internal predecessors, (66), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-11-25 20:13:16,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:16,157 INFO L93 Difference]: Finished difference Result 73 states and 86 transitions. [2021-11-25 20:13:16,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:13:16,160 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 5 [2021-11-25 20:13:16,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:16,171 INFO L225 Difference]: With dead ends: 73 [2021-11-25 20:13:16,172 INFO L226 Difference]: Without dead ends: 71 [2021-11-25 20:13:16,174 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:13:16,178 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 6 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:16,180 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 133 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:16,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-25 20:13:16,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2021-11-25 20:13:16,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 38 states have (on average 1.631578947368421) internal successors, (62), 56 states have internal predecessors, (62), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 20:13:16,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 80 transitions. [2021-11-25 20:13:16,234 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 80 transitions. Word has length 5 [2021-11-25 20:13:16,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:16,235 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 80 transitions. [2021-11-25 20:13:16,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-11-25 20:13:16,235 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 80 transitions. [2021-11-25 20:13:16,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-25 20:13:16,237 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:16,237 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-25 20:13:16,255 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:16,450 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:13:16,451 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting nondet_treeErr1REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:13:16,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:16,455 INFO L85 PathProgramCache]: Analyzing trace with hash 73597258, now seen corresponding path program 1 times [2021-11-25 20:13:16,456 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:13:16,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1165137309] [2021-11-25 20:13:16,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:16,457 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:13:16,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:13:16,459 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:13:16,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-25 20:13:16,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:16,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:13:16,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:16,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:13:16,600 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:16,600 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:13:16,601 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:13:16,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1165137309] [2021-11-25 20:13:16,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1165137309] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:16,602 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:13:16,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:13:16,602 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105307098] [2021-11-25 20:13:16,603 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:16,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:13:16,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:13:16,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:13:16,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:13:16,606 INFO L87 Difference]: Start difference. First operand 69 states and 80 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-11-25 20:13:16,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:16,739 INFO L93 Difference]: Finished difference Result 68 states and 79 transitions. [2021-11-25 20:13:16,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:13:16,740 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 5 [2021-11-25 20:13:16,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:16,742 INFO L225 Difference]: With dead ends: 68 [2021-11-25 20:13:16,742 INFO L226 Difference]: Without dead ends: 68 [2021-11-25 20:13:16,742 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:13:16,744 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 2 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:16,745 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 132 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:16,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-25 20:13:16,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-25 20:13:16,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 38 states have (on average 1.605263157894737) internal successors, (61), 55 states have internal predecessors, (61), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 20:13:16,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2021-11-25 20:13:16,758 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 5 [2021-11-25 20:13:16,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:16,759 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2021-11-25 20:13:16,759 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2021-11-25 20:13:16,760 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2021-11-25 20:13:16,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 20:13:16,761 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:16,761 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:16,781 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:16,973 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:13:16,974 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:13:16,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:16,974 INFO L85 PathProgramCache]: Analyzing trace with hash -345289291, now seen corresponding path program 1 times [2021-11-25 20:13:16,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:13:16,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1738404968] [2021-11-25 20:13:16,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:16,976 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:13:16,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:13:16,979 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:13:17,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-25 20:13:17,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:17,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 20:13:17,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:17,336 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:17,337 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:13:17,337 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:13:17,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1738404968] [2021-11-25 20:13:17,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1738404968] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:17,338 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:13:17,338 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 20:13:17,339 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736010724] [2021-11-25 20:13:17,339 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:17,339 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:13:17,340 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:13:17,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:13:17,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:13:17,341 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 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) [2021-11-25 20:13:17,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:17,473 INFO L93 Difference]: Finished difference Result 83 states and 98 transitions. [2021-11-25 20:13:17,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:13:17,474 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 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 11 [2021-11-25 20:13:17,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:17,476 INFO L225 Difference]: With dead ends: 83 [2021-11-25 20:13:17,476 INFO L226 Difference]: Without dead ends: 83 [2021-11-25 20:13:17,477 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:13:17,478 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 11 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 444 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:17,479 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 444 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:17,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-25 20:13:17,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 76. [2021-11-25 20:13:17,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 61 states have internal predecessors, (66), 10 states have call successors, (10), 4 states have call predecessors, (10), 5 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) [2021-11-25 20:13:17,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 89 transitions. [2021-11-25 20:13:17,495 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 89 transitions. Word has length 11 [2021-11-25 20:13:17,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:17,496 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 89 transitions. [2021-11-25 20:13:17,496 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 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) [2021-11-25 20:13:17,496 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 89 transitions. [2021-11-25 20:13:17,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 20:13:17,497 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:17,497 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:17,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:17,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:13:17,698 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:13:17,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:17,699 INFO L85 PathProgramCache]: Analyzing trace with hash -159104294, now seen corresponding path program 1 times [2021-11-25 20:13:17,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:13:17,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [941709595] [2021-11-25 20:13:17,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:17,700 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:13:17,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:13:17,701 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:13:17,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-25 20:13:17,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:17,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 20:13:17,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:17,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:13:17,874 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:17,874 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:13:17,877 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:13:17,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [941709595] [2021-11-25 20:13:17,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [941709595] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:17,882 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:13:17,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:13:17,883 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498300337] [2021-11-25 20:13:17,884 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:17,885 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:13:17,885 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:13:17,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:13:17,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:13:17,886 INFO L87 Difference]: Start difference. First operand 76 states and 89 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-11-25 20:13:18,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:18,181 INFO L93 Difference]: Finished difference Result 80 states and 93 transitions. [2021-11-25 20:13:18,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:13:18,182 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 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 11 [2021-11-25 20:13:18,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:18,184 INFO L225 Difference]: With dead ends: 80 [2021-11-25 20:13:18,184 INFO L226 Difference]: Without dead ends: 80 [2021-11-25 20:13:18,184 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:13:18,185 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 49 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:18,186 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 72 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:13:18,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-25 20:13:18,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2021-11-25 20:13:18,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 45 states have (on average 1.5555555555555556) internal successors, (70), 61 states have internal predecessors, (70), 10 states have call successors, (10), 4 states have call predecessors, (10), 5 states have return successors, (13), 12 states have call predecessors, (13), 10 states have call successors, (13) [2021-11-25 20:13:18,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 93 transitions. [2021-11-25 20:13:18,206 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 93 transitions. Word has length 11 [2021-11-25 20:13:18,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:18,206 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 93 transitions. [2021-11-25 20:13:18,206 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-11-25 20:13:18,210 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 93 transitions. [2021-11-25 20:13:18,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 20:13:18,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:18,212 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:18,237 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:18,431 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:13:18,432 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:13:18,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:18,432 INFO L85 PathProgramCache]: Analyzing trace with hash -159104293, now seen corresponding path program 1 times [2021-11-25 20:13:18,433 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:13:18,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1475376554] [2021-11-25 20:13:18,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:18,433 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:13:18,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:13:18,436 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:13:18,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-25 20:13:18,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:18,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 20:13:18,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:18,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:13:18,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:18,598 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:13:18,598 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:13:18,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1475376554] [2021-11-25 20:13:18,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1475376554] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:18,598 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:13:18,599 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:13:18,599 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182006279] [2021-11-25 20:13:18,599 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:18,600 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:13:18,600 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:13:18,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:13:18,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:13:18,601 INFO L87 Difference]: Start difference. First operand 78 states and 93 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-11-25 20:13:18,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:18,916 INFO L93 Difference]: Finished difference Result 84 states and 103 transitions. [2021-11-25 20:13:18,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:13:18,918 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 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 11 [2021-11-25 20:13:18,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:18,919 INFO L225 Difference]: With dead ends: 84 [2021-11-25 20:13:18,919 INFO L226 Difference]: Without dead ends: 84 [2021-11-25 20:13:18,920 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:13:18,921 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 47 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:18,921 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 83 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:13:18,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-25 20:13:18,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 81. [2021-11-25 20:13:18,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 47 states have (on average 1.5106382978723405) internal successors, (71), 63 states have internal predecessors, (71), 11 states have call successors, (11), 4 states have call predecessors, (11), 5 states have return successors, (15), 13 states have call predecessors, (15), 11 states have call successors, (15) [2021-11-25 20:13:18,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 97 transitions. [2021-11-25 20:13:18,934 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 97 transitions. Word has length 11 [2021-11-25 20:13:18,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:18,935 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 97 transitions. [2021-11-25 20:13:18,935 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-11-25 20:13:18,935 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 97 transitions. [2021-11-25 20:13:18,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-25 20:13:18,936 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:18,936 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:18,952 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:19,152 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:13:19,153 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting checkErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:13:19,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:19,154 INFO L85 PathProgramCache]: Analyzing trace with hash -1041946460, now seen corresponding path program 1 times [2021-11-25 20:13:19,154 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:13:19,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [850835589] [2021-11-25 20:13:19,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:19,154 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:13:19,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:13:19,161 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:13:19,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-25 20:13:19,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:19,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 20:13:19,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:19,367 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:19,367 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:13:19,367 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:13:19,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [850835589] [2021-11-25 20:13:19,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [850835589] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:19,368 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:13:19,368 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 20:13:19,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654390494] [2021-11-25 20:13:19,369 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:19,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:13:19,370 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:13:19,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:13:19,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:13:19,371 INFO L87 Difference]: Start difference. First operand 81 states and 97 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 20:13:19,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:19,497 INFO L93 Difference]: Finished difference Result 92 states and 109 transitions. [2021-11-25 20:13:19,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:13:19,499 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2021-11-25 20:13:19,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:19,501 INFO L225 Difference]: With dead ends: 92 [2021-11-25 20:13:19,501 INFO L226 Difference]: Without dead ends: 92 [2021-11-25 20:13:19,501 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:13:19,502 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 10 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 444 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:19,503 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 444 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:13:19,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-25 20:13:19,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 87. [2021-11-25 20:13:19,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 51 states have (on average 1.4705882352941178) internal successors, (75), 67 states have internal predecessors, (75), 12 states have call successors, (12), 5 states have call predecessors, (12), 6 states have return successors, (16), 14 states have call predecessors, (16), 12 states have call successors, (16) [2021-11-25 20:13:19,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 103 transitions. [2021-11-25 20:13:19,519 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 103 transitions. Word has length 17 [2021-11-25 20:13:19,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:19,520 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 103 transitions. [2021-11-25 20:13:19,520 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-25 20:13:19,521 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 103 transitions. [2021-11-25 20:13:19,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 20:13:19,522 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:19,522 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] [2021-11-25 20:13:19,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:19,735 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:13:19,735 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONMEMORY_LEAK === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:13:19,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:19,736 INFO L85 PathProgramCache]: Analyzing trace with hash -868680531, now seen corresponding path program 1 times [2021-11-25 20:13:19,736 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:13:19,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1654551386] [2021-11-25 20:13:19,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:19,737 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:13:19,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:13:19,738 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:13:19,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-25 20:13:19,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:19,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:13:19,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:19,841 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:13:19,841 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:13:19,842 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:13:19,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1654551386] [2021-11-25 20:13:19,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1654551386] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:13:19,842 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:13:19,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:13:19,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769162343] [2021-11-25 20:13:19,842 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:13:19,843 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:13:19,843 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:13:19,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:13:19,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:13:19,844 INFO L87 Difference]: Start difference. First operand 87 states and 103 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 20:13:20,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:20,097 INFO L93 Difference]: Finished difference Result 89 states and 104 transitions. [2021-11-25 20:13:20,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:13:20,098 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 20 [2021-11-25 20:13:20,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:20,099 INFO L225 Difference]: With dead ends: 89 [2021-11-25 20:13:20,099 INFO L226 Difference]: Without dead ends: 75 [2021-11-25 20:13:20,099 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:13:20,100 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 42 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:20,100 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 82 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:13:20,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-25 20:13:20,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-25 20:13:20,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 43 states have (on average 1.558139534883721) internal successors, (67), 59 states have internal predecessors, (67), 10 states have call successors, (10), 3 states have call predecessors, (10), 4 states have return successors, (13), 12 states have call predecessors, (13), 10 states have call successors, (13) [2021-11-25 20:13:20,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-25 20:13:20,108 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 20 [2021-11-25 20:13:20,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:20,109 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-25 20:13:20,109 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 20:13:20,109 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-25 20:13:20,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-25 20:13:20,110 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:20,110 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:20,133 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:20,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:13:20,329 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:13:20,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:20,330 INFO L85 PathProgramCache]: Analyzing trace with hash -360622958, now seen corresponding path program 1 times [2021-11-25 20:13:20,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:13:20,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [352434229] [2021-11-25 20:13:20,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:20,331 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:13:20,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:13:20,331 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:13:20,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-25 20:13:20,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:20,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 20:13:20,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:20,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:13:20,907 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-11-25 20:13:20,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 32 [2021-11-25 20:13:20,932 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:13:20,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:21,125 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:13:21,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [352434229] [2021-11-25 20:13:21,126 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [352434229] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:21,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [17787457] [2021-11-25 20:13:21,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:21,126 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:13:21,126 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:13:21,130 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:13:21,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-11-25 20:13:21,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:21,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:13:21,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:21,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:13:23,663 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-11-25 20:13:23,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:13:23,679 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:13:23,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:23,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [17787457] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:23,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [116019232] [2021-11-25 20:13:23,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:23,878 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:23,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:23,901 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:23,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:13:24,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:24,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 20:13:24,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:24,368 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-11-25 20:13:24,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 31 [2021-11-25 20:13:24,383 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 20:13:24,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:24,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [116019232] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:24,585 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:24,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 5 [2021-11-25 20:13:24,586 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542478858] [2021-11-25 20:13:24,586 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:24,587 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:13:24,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:13:24,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:13:24,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2021-11-25 20:13:24,588 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 6 states, 5 states have (on average 5.6) internal successors, (28), 6 states have internal predecessors, (28), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 20:13:28,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:28,888 INFO L93 Difference]: Finished difference Result 81 states and 98 transitions. [2021-11-25 20:13:28,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:13:28,889 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.6) internal successors, (28), 6 states have internal predecessors, (28), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 29 [2021-11-25 20:13:28,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:28,890 INFO L225 Difference]: With dead ends: 81 [2021-11-25 20:13:28,890 INFO L226 Difference]: Without dead ends: 81 [2021-11-25 20:13:28,891 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 82 SyntacticMatches, 18 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2021-11-25 20:13:28,891 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 46 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 155 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:28,892 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 102 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 95 Invalid, 0 Unknown, 155 Unchecked, 0.2s Time] [2021-11-25 20:13:28,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-25 20:13:28,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2021-11-25 20:13:28,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 46 states have (on average 1.5434782608695652) internal successors, (71), 62 states have internal predecessors, (71), 10 states have call successors, (10), 3 states have call predecessors, (10), 5 states have return successors, (17), 13 states have call predecessors, (17), 10 states have call successors, (17) [2021-11-25 20:13:28,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 98 transitions. [2021-11-25 20:13:28,900 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 98 transitions. Word has length 29 [2021-11-25 20:13:28,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:28,901 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 98 transitions. [2021-11-25 20:13:28,901 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.6) internal successors, (28), 6 states have internal predecessors, (28), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 20:13:28,902 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 98 transitions. [2021-11-25 20:13:28,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-25 20:13:28,903 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:28,903 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:28,914 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:29,142 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:29,326 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:29,517 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:13:29,517 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:13:29,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:29,518 INFO L85 PathProgramCache]: Analyzing trace with hash -120629553, now seen corresponding path program 1 times [2021-11-25 20:13:29,518 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:13:29,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [429347481] [2021-11-25 20:13:29,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:29,519 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:13:29,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:13:29,519 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:13:29,520 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-25 20:13:29,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:29,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 20:13:29,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:29,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:13:29,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:13:34,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:13:34,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 20:13:34,148 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:13:34,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-11-25 20:13:34,180 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:13:34,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:34,509 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:13:34,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [429347481] [2021-11-25 20:13:34,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [429347481] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:34,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [599286543] [2021-11-25 20:13:34,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:34,510 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:13:34,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:13:34,513 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:13:34,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-25 20:13:34,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:34,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 20:13:34,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:34,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:13:34,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:13:41,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:13:41,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 20:13:41,130 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:13:41,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-11-25 20:13:41,141 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:13:41,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:43,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [599286543] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:43,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527941976] [2021-11-25 20:13:43,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:43,390 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:43,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:43,391 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:43,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 20:13:43,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:43,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 20:13:43,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:43,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:13:47,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:13:47,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 20:13:47,936 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:13:47,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-11-25 20:13:47,948 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:13:47,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:48,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [527941976] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:13:48,261 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:13:48,261 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 6 [2021-11-25 20:13:48,261 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116900520] [2021-11-25 20:13:48,261 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:48,262 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:13:48,262 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:13:48,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:13:48,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:13:48,263 INFO L87 Difference]: Start difference. First operand 79 states and 98 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 20:13:48,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:48,699 INFO L93 Difference]: Finished difference Result 98 states and 130 transitions. [2021-11-25 20:13:48,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 20:13:48,702 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2021-11-25 20:13:48,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:48,703 INFO L225 Difference]: With dead ends: 98 [2021-11-25 20:13:48,703 INFO L226 Difference]: Without dead ends: 98 [2021-11-25 20:13:48,704 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 61 SyntacticMatches, 11 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 16.6s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-25 20:13:48,704 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 57 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 96 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:48,705 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 111 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 132 Invalid, 0 Unknown, 96 Unchecked, 0.4s Time] [2021-11-25 20:13:48,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-11-25 20:13:48,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 95. [2021-11-25 20:13:48,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 57 states have (on average 1.4385964912280702) internal successors, (82), 74 states have internal predecessors, (82), 13 states have call successors, (13), 4 states have call predecessors, (13), 7 states have return successors, (26), 16 states have call predecessors, (26), 13 states have call successors, (26) [2021-11-25 20:13:48,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 121 transitions. [2021-11-25 20:13:48,733 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 121 transitions. Word has length 25 [2021-11-25 20:13:48,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:48,734 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 121 transitions. [2021-11-25 20:13:48,736 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 20:13:48,736 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 121 transitions. [2021-11-25 20:13:48,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-25 20:13:48,741 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:48,742 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:48,771 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-11-25 20:13:48,954 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (13)] Ended with exit code 0 [2021-11-25 20:13:49,161 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:49,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:13:49,354 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:13:49,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:49,354 INFO L85 PathProgramCache]: Analyzing trace with hash -694882647, now seen corresponding path program 1 times [2021-11-25 20:13:49,354 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:13:49,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2029568428] [2021-11-25 20:13:49,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:49,354 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:13:49,355 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:13:49,355 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:13:49,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-25 20:13:49,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:49,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 20:13:49,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:49,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:13:49,659 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:13:49,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:50,115 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:13:50,115 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:13:50,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2029568428] [2021-11-25 20:13:50,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2029568428] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:50,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [688174751] [2021-11-25 20:13:50,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:50,116 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:13:50,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:13:50,121 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:13:50,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-25 20:13:50,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:50,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:13:50,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:50,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:13:50,433 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:13:50,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:50,841 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:13:50,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [688174751] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:50,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241210890] [2021-11-25 20:13:50,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:50,842 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:50,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:50,843 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:50,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 20:13:50,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:50,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:13:50,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:51,096 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:13:51,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:51,511 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:13:51,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241210890] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:51,512 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:13:51,512 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 9 [2021-11-25 20:13:51,512 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921031704] [2021-11-25 20:13:51,513 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:51,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 20:13:51,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:13:51,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 20:13:51,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-11-25 20:13:51,516 INFO L87 Difference]: Start difference. First operand 95 states and 121 transitions. Second operand has 10 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 20:13:52,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:13:52,447 INFO L93 Difference]: Finished difference Result 113 states and 145 transitions. [2021-11-25 20:13:52,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:13:52,449 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 25 [2021-11-25 20:13:52,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:13:52,451 INFO L225 Difference]: With dead ends: 113 [2021-11-25 20:13:52,451 INFO L226 Difference]: Without dead ends: 113 [2021-11-25 20:13:52,451 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 100 SyntacticMatches, 36 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:13:52,452 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 109 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 482 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:13:52,452 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 112 Invalid, 533 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 482 Invalid, 0 Unknown, 21 Unchecked, 0.8s Time] [2021-11-25 20:13:52,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-25 20:13:52,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 107. [2021-11-25 20:13:52,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 68 states have (on average 1.4264705882352942) internal successors, (97), 83 states have internal predecessors, (97), 15 states have call successors, (15), 5 states have call predecessors, (15), 8 states have return successors, (28), 18 states have call predecessors, (28), 15 states have call successors, (28) [2021-11-25 20:13:52,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 140 transitions. [2021-11-25 20:13:52,462 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 140 transitions. Word has length 25 [2021-11-25 20:13:52,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:13:52,462 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 140 transitions. [2021-11-25 20:13:52,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 20:13:52,463 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 140 transitions. [2021-11-25 20:13:52,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-25 20:13:52,464 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:13:52,464 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:13:52,489 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:52,684 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-25 20:13:52,878 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (16)] Ended with exit code 0 [2021-11-25 20:13:53,077 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 20:13:53,077 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting maxErr1REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:13:53,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:13:53,078 INFO L85 PathProgramCache]: Analyzing trace with hash -694882646, now seen corresponding path program 1 times [2021-11-25 20:13:53,078 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:13:53,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [509807673] [2021-11-25 20:13:53,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:53,078 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:13:53,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:13:53,079 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:13:53,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-25 20:13:53,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:53,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:13:53,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:53,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:13:53,457 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:13:53,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:55,006 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:13:55,006 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:13:55,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [509807673] [2021-11-25 20:13:55,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [509807673] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:55,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1375408541] [2021-11-25 20:13:55,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:55,007 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:13:55,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:13:55,013 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:13:55,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-25 20:13:55,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:55,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:13:55,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:55,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:13:55,400 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:13:55,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:56,787 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:13:56,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1375408541] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:56,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [216267704] [2021-11-25 20:13:56,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:13:56,788 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:13:56,788 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:13:56,793 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:13:56,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 20:13:56,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:13:56,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:13:56,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:13:56,923 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:13:57,107 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:13:57,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:13:58,505 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:13:58,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [216267704] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:13:58,506 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:13:58,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-25 20:13:58,506 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955916939] [2021-11-25 20:13:58,506 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:13:58,507 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 20:13:58,507 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:13:58,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 20:13:58,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-11-25 20:13:58,508 INFO L87 Difference]: Start difference. First operand 107 states and 140 transitions. Second operand has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 20:14:00,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:00,398 INFO L93 Difference]: Finished difference Result 135 states and 178 transitions. [2021-11-25 20:14:00,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:14:00,400 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 25 [2021-11-25 20:14:00,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:00,401 INFO L225 Difference]: With dead ends: 135 [2021-11-25 20:14:00,402 INFO L226 Difference]: Without dead ends: 133 [2021-11-25 20:14:00,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 125 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2021-11-25 20:14:00,403 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 61 mSDsluCounter, 449 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 524 SdHoareTripleChecker+Invalid, 590 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 484 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:00,403 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 524 Invalid, 590 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 484 Invalid, 0 Unknown, 92 Unchecked, 1.7s Time] [2021-11-25 20:14:00,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-25 20:14:00,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 124. [2021-11-25 20:14:00,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 81 states have (on average 1.3950617283950617) internal successors, (113), 95 states have internal predecessors, (113), 18 states have call successors, (18), 7 states have call predecessors, (18), 9 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2021-11-25 20:14:00,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2021-11-25 20:14:00,428 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 25 [2021-11-25 20:14:00,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:00,429 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2021-11-25 20:14:00,429 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 20:14:00,429 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2021-11-25 20:14:00,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 20:14:00,431 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:00,431 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-25 20:14:00,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:00,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:00,866 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:01,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:01,046 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting checkErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:14:01,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:01,047 INFO L85 PathProgramCache]: Analyzing trace with hash 986137240, now seen corresponding path program 1 times [2021-11-25 20:14:01,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:14:01,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1708670854] [2021-11-25 20:14:01,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:01,048 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:14:01,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:14:01,049 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:14:01,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-25 20:14:01,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:01,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:14:01,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:01,279 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 20:14:01,279 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:14:01,280 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:14:01,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1708670854] [2021-11-25 20:14:01,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1708670854] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:14:01,280 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:14:01,280 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 20:14:01,280 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684818540] [2021-11-25 20:14:01,280 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:14:01,281 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:14:01,281 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:14:01,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:14:01,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-25 20:14:01,282 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 20:14:01,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:01,609 INFO L93 Difference]: Finished difference Result 130 states and 171 transitions. [2021-11-25 20:14:01,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:14:01,613 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 31 [2021-11-25 20:14:01,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:01,615 INFO L225 Difference]: With dead ends: 130 [2021-11-25 20:14:01,615 INFO L226 Difference]: Without dead ends: 126 [2021-11-25 20:14:01,615 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-25 20:14:01,616 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 29 mSDsluCounter, 311 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:01,617 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 370 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:14:01,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-25 20:14:01,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 124. [2021-11-25 20:14:01,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 81 states have (on average 1.3703703703703705) internal successors, (111), 95 states have internal predecessors, (111), 18 states have call successors, (18), 7 states have call predecessors, (18), 9 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2021-11-25 20:14:01,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 160 transitions. [2021-11-25 20:14:01,628 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 160 transitions. Word has length 31 [2021-11-25 20:14:01,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:01,629 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 160 transitions. [2021-11-25 20:14:01,629 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-25 20:14:01,629 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 160 transitions. [2021-11-25 20:14:01,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 20:14:01,631 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:01,631 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-11-25 20:14:01,657 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (21)] Ended with exit code 0 [2021-11-25 20:14:01,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:14:01,844 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:14:01,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:01,845 INFO L85 PathProgramCache]: Analyzing trace with hash 1746105865, now seen corresponding path program 1 times [2021-11-25 20:14:01,846 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:14:01,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1666219808] [2021-11-25 20:14:01,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:01,847 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:14:01,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:14:01,848 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:14:01,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-25 20:14:02,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:02,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-25 20:14:02,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:02,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:14:02,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:14:02,237 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-25 20:14:02,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 20:14:02,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:14:02,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 20:14:02,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-11-25 20:14:02,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-11-25 20:14:02,801 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:14:02,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:07,911 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:14:07,911 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:14:07,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1666219808] [2021-11-25 20:14:07,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1666219808] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:07,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2130889268] [2021-11-25 20:14:07,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:07,912 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:14:07,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:14:07,917 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:14:07,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-25 20:14:08,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:08,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-25 20:14:08,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:08,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:14:08,341 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:14:08,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:14:08,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 20:14:08,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:14:08,506 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 20:14:08,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 20:14:08,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 20:14:09,014 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:14:09,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:12,216 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:14:12,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2130889268] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:12,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1504778487] [2021-11-25 20:14:12,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:12,217 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:12,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:12,218 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:12,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 20:14:12,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:12,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 20:14:12,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:12,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:14:12,389 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:14:12,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:14:12,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 20:14:12,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:14:12,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 20:14:12,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 20:14:12,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 20:14:12,673 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:14:12,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:15,785 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:14:15,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1504778487] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:14:15,786 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:14:15,786 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 15, 14, 15, 14] total 23 [2021-11-25 20:14:15,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013910418] [2021-11-25 20:14:15,786 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:15,787 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 20:14:15,787 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:14:15,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 20:14:15,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=451, Unknown=2, NotChecked=0, Total=506 [2021-11-25 20:14:15,788 INFO L87 Difference]: Start difference. First operand 124 states and 160 transitions. Second operand has 23 states, 20 states have (on average 1.95) internal successors, (39), 16 states have internal predecessors, (39), 7 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-25 20:14:17,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:17,046 INFO L93 Difference]: Finished difference Result 139 states and 178 transitions. [2021-11-25 20:14:17,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 20:14:17,047 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 20 states have (on average 1.95) internal successors, (39), 16 states have internal predecessors, (39), 7 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) Word has length 31 [2021-11-25 20:14:17,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:17,049 INFO L225 Difference]: With dead ends: 139 [2021-11-25 20:14:17,050 INFO L226 Difference]: Without dead ends: 139 [2021-11-25 20:14:17,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 154 SyntacticMatches, 5 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=101, Invalid=827, Unknown=2, NotChecked=0, Total=930 [2021-11-25 20:14:17,051 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 67 mSDsluCounter, 903 mSDsCounter, 0 mSdLazyCounter, 391 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 978 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 87 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:17,051 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 978 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 391 Invalid, 0 Unknown, 87 Unchecked, 0.9s Time] [2021-11-25 20:14:17,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-11-25 20:14:17,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 131. [2021-11-25 20:14:17,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 86 states have (on average 1.3604651162790697) internal successors, (117), 100 states have internal predecessors, (117), 18 states have call successors, (18), 9 states have call predecessors, (18), 11 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2021-11-25 20:14:17,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 166 transitions. [2021-11-25 20:14:17,063 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 166 transitions. Word has length 31 [2021-11-25 20:14:17,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:17,063 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 166 transitions. [2021-11-25 20:14:17,063 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 20 states have (on average 1.95) internal successors, (39), 16 states have internal predecessors, (39), 7 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-25 20:14:17,064 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 166 transitions. [2021-11-25 20:14:17,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-25 20:14:17,065 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:17,065 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-25 20:14:17,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:17,286 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:17,490 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:17,681 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:14:17,682 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting nondet_treeErr4REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:14:17,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:17,682 INFO L85 PathProgramCache]: Analyzing trace with hash -592661437, now seen corresponding path program 1 times [2021-11-25 20:14:17,682 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:14:17,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [70973300] [2021-11-25 20:14:17,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:17,683 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:14:17,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:14:17,684 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:14:17,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-25 20:14:17,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:17,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 20:14:17,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:17,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:14:18,284 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-11-25 20:14:18,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 32 [2021-11-25 20:14:18,303 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 14 proven. 13 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 20:14:18,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:18,523 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:14:18,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [70973300] [2021-11-25 20:14:18,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [70973300] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:18,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1155582302] [2021-11-25 20:14:18,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:18,524 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:14:18,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:14:18,525 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:14:18,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-25 20:14:18,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:18,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:14:18,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:18,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:14:21,046 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-11-25 20:14:21,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 20:14:21,061 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 14 proven. 13 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 20:14:21,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:21,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1155582302] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:21,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [240569151] [2021-11-25 20:14:21,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:21,222 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:21,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:21,237 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:21,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-25 20:14:21,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:21,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:14:21,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:21,690 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-11-25 20:14:21,690 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 31 [2021-11-25 20:14:21,703 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 14 proven. 12 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 20:14:21,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:21,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [240569151] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:21,896 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:21,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 5 [2021-11-25 20:14:21,896 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664366134] [2021-11-25 20:14:21,896 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:21,897 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:14:21,897 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:14:21,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:14:21,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=27, Unknown=1, NotChecked=0, Total=42 [2021-11-25 20:14:21,898 INFO L87 Difference]: Start difference. First operand 131 states and 166 transitions. Second operand has 6 states, 5 states have (on average 6.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-25 20:14:26,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:26,211 INFO L93 Difference]: Finished difference Result 133 states and 168 transitions. [2021-11-25 20:14:26,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:14:26,212 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 35 [2021-11-25 20:14:26,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:26,213 INFO L225 Difference]: With dead ends: 133 [2021-11-25 20:14:26,214 INFO L226 Difference]: Without dead ends: 133 [2021-11-25 20:14:26,214 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 102 SyntacticMatches, 17 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=26, Invalid=44, Unknown=2, NotChecked=0, Total=72 [2021-11-25 20:14:26,214 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 44 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 160 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:26,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 101 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 92 Invalid, 0 Unknown, 160 Unchecked, 0.2s Time] [2021-11-25 20:14:26,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-25 20:14:26,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 131. [2021-11-25 20:14:26,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 86 states have (on average 1.3604651162790697) internal successors, (117), 100 states have internal predecessors, (117), 18 states have call successors, (18), 9 states have call predecessors, (18), 11 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2021-11-25 20:14:26,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 166 transitions. [2021-11-25 20:14:26,223 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 166 transitions. Word has length 35 [2021-11-25 20:14:26,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:26,223 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 166 transitions. [2021-11-25 20:14:26,224 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-25 20:14:26,224 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 166 transitions. [2021-11-25 20:14:26,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 20:14:26,225 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:26,226 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2021-11-25 20:14:26,229 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:26,437 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (25)] Ended with exit code 0 [2021-11-25 20:14:26,650 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-11-25 20:14:26,829 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:26,830 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:14:26,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:26,830 INFO L85 PathProgramCache]: Analyzing trace with hash -914000346, now seen corresponding path program 1 times [2021-11-25 20:14:26,831 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:14:26,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [705351849] [2021-11-25 20:14:26,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:26,831 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:14:26,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:14:26,832 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:14:26,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-25 20:14:27,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:27,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:14:27,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:27,215 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:14:27,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:14:31,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:14:31,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 20:14:31,626 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:14:31,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-11-25 20:14:31,657 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 71 proven. 21 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 20:14:31,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:31,989 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:14:31,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [705351849] [2021-11-25 20:14:31,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [705351849] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:31,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2119318644] [2021-11-25 20:14:31,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:31,990 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:14:31,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:14:31,991 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:14:31,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-25 20:14:32,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:32,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:14:32,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:32,439 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:14:32,446 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:14:36,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:14:36,785 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 20:14:36,799 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:14:36,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 17 [2021-11-25 20:14:36,808 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 71 proven. 21 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 20:14:36,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:37,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2119318644] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:37,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360220377] [2021-11-25 20:14:37,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:14:37,060 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:37,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:37,061 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:37,063 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-25 20:14:37,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:14:37,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 20:14:37,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:37,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:14:41,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:14:41,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 20:14:41,651 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:14:41,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-11-25 20:14:41,658 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 71 proven. 21 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 20:14:41,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:43,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [360220377] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:43,928 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:14:43,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 6 [2021-11-25 20:14:43,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207066896] [2021-11-25 20:14:43,928 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:43,929 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:14:43,930 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:14:43,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:14:43,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:14:43,931 INFO L87 Difference]: Start difference. First operand 131 states and 166 transitions. Second operand has 7 states, 6 states have (on average 5.166666666666667) internal successors, (31), 7 states have internal predecessors, (31), 3 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 20:14:44,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:14:44,325 INFO L93 Difference]: Finished difference Result 135 states and 176 transitions. [2021-11-25 20:14:44,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:14:44,326 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 5.166666666666667) internal successors, (31), 7 states have internal predecessors, (31), 3 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 55 [2021-11-25 20:14:44,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:14:44,328 INFO L225 Difference]: With dead ends: 135 [2021-11-25 20:14:44,328 INFO L226 Difference]: Without dead ends: 135 [2021-11-25 20:14:44,329 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 151 SyntacticMatches, 11 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-25 20:14:44,329 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 84 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 94 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:14:44,330 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 108 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 156 Invalid, 0 Unknown, 94 Unchecked, 0.4s Time] [2021-11-25 20:14:44,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-25 20:14:44,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 131. [2021-11-25 20:14:44,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 86 states have (on average 1.3604651162790697) internal successors, (117), 100 states have internal predecessors, (117), 18 states have call successors, (18), 9 states have call predecessors, (18), 11 states have return successors, (31), 21 states have call predecessors, (31), 18 states have call successors, (31) [2021-11-25 20:14:44,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 166 transitions. [2021-11-25 20:14:44,340 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 166 transitions. Word has length 55 [2021-11-25 20:14:44,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:14:44,341 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 166 transitions. [2021-11-25 20:14:44,341 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 5.166666666666667) internal successors, (31), 7 states have internal predecessors, (31), 3 states have call successors, (7), 3 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 20:14:44,342 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 166 transitions. [2021-11-25 20:14:44,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 20:14:44,343 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:14:44,343 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2021-11-25 20:14:44,356 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:44,555 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:44,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-25 20:14:44,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:44,950 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:14:44,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:14:44,950 INFO L85 PathProgramCache]: Analyzing trace with hash 1805515892, now seen corresponding path program 2 times [2021-11-25 20:14:44,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:14:44,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1181032148] [2021-11-25 20:14:44,951 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:14:44,951 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:14:44,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:14:44,952 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:14:44,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-25 20:14:45,239 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:14:45,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:14:45,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 20:14:45,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:45,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:14:49,954 INFO L354 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-11-25 20:14:49,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 29 treesize of output 45 [2021-11-25 20:14:50,140 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 27 refuted. 3 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 20:14:50,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:50,797 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:14:50,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1181032148] [2021-11-25 20:14:50,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1181032148] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:50,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1322069039] [2021-11-25 20:14:50,798 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:14:50,798 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:14:50,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:14:50,799 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:14:50,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-25 20:14:51,117 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:14:51,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [516377325] [2021-11-25 20:14:51,118 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:14:51,119 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:14:51,119 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 1 [2021-11-25 20:14:51,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:14:51,120 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:14:51,121 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-25 20:14:51,399 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:14:51,399 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:14:51,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 20:14:51,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:14:58,326 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:14:58,355 INFO L354 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2021-11-25 20:14:58,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-25 20:14:58,382 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 42 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:14:58,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:14:58,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [516377325] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:14:58,668 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:14:58,668 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2021-11-25 20:14:58,668 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093564945] [2021-11-25 20:14:58,668 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:58,668 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 20:14:58,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:14:58,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 20:14:58,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=79, Unknown=3, NotChecked=0, Total=110 [2021-11-25 20:14:58,670 INFO L87 Difference]: Start difference. First operand 131 states and 166 transitions. Second operand has 10 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 6 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-25 20:15:07,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:07,007 INFO L93 Difference]: Finished difference Result 169 states and 224 transitions. [2021-11-25 20:15:07,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 20:15:07,008 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 6 states have call predecessors, (9), 7 states have call successors, (9) Word has length 49 [2021-11-25 20:15:07,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:07,010 INFO L225 Difference]: With dead ends: 169 [2021-11-25 20:15:07,010 INFO L226 Difference]: Without dead ends: 169 [2021-11-25 20:15:07,010 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 89 SyntacticMatches, 13 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=46, Invalid=107, Unknown=3, NotChecked=0, Total=156 [2021-11-25 20:15:07,011 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 48 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 418 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 324 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:07,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 170 Invalid, 418 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 86 Invalid, 0 Unknown, 324 Unchecked, 0.2s Time] [2021-11-25 20:15:07,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-11-25 20:15:07,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 168. [2021-11-25 20:15:07,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 112 states have (on average 1.3125) internal successors, (147), 127 states have internal predecessors, (147), 23 states have call successors, (23), 12 states have call predecessors, (23), 17 states have return successors, (54), 28 states have call predecessors, (54), 23 states have call successors, (54) [2021-11-25 20:15:07,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 224 transitions. [2021-11-25 20:15:07,027 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 224 transitions. Word has length 49 [2021-11-25 20:15:07,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:07,029 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 224 transitions. [2021-11-25 20:15:07,029 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.555555555555555) internal successors, (41), 9 states have internal predecessors, (41), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 6 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-25 20:15:07,029 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 224 transitions. [2021-11-25 20:15:07,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 20:15:07,031 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:07,031 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1] [2021-11-25 20:15:07,063 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:07,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:07,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:15:07,445 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:15:07,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:07,446 INFO L85 PathProgramCache]: Analyzing trace with hash 1805515893, now seen corresponding path program 2 times [2021-11-25 20:15:07,446 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:15:07,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [675338524] [2021-11-25 20:15:07,446 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:15:07,446 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:15:07,447 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:15:07,447 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:15:07,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-25 20:15:07,728 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:15:07,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:15:07,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:15:07,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:07,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:15:07,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:15:12,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:15:12,281 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-11-25 20:15:12,281 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2021-11-25 20:15:12,299 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:15:12,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-11-25 20:15:12,376 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 34 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:15:12,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:16,032 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:15:16,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [675338524] [2021-11-25 20:15:16,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [675338524] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:16,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [659614303] [2021-11-25 20:15:16,032 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:15:16,033 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:15:16,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:15:16,033 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:15:16,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-11-25 20:15:16,405 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:15:16,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:15:16,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 20:15:16,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:16,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:15:16,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:15:20,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:15:20,917 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-11-25 20:15:20,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2021-11-25 20:15:20,941 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:15:20,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 20 [2021-11-25 20:15:20,972 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 34 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:15:20,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:24,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [659614303] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:24,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [959693260] [2021-11-25 20:15:24,083 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:15:24,083 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:24,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:24,084 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:24,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-25 20:15:24,290 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:15:24,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:15:24,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 20:15:24,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:24,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:15:28,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:15:28,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:15:29,013 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-25 20:15:29,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 19 [2021-11-25 20:15:29,035 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:15:29,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 23 [2021-11-25 20:15:29,154 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 41 proven. 36 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 20:15:29,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:34,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [959693260] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:34,814 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:15:34,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 10] total 13 [2021-11-25 20:15:34,815 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646250565] [2021-11-25 20:15:34,815 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:15:34,815 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:15:34,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:15:34,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:15:34,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=218, Unknown=6, NotChecked=0, Total=272 [2021-11-25 20:15:34,817 INFO L87 Difference]: Start difference. First operand 168 states and 224 transitions. Second operand has 14 states, 13 states have (on average 3.8461538461538463) internal successors, (50), 12 states have internal predecessors, (50), 8 states have call successors, (12), 3 states have call predecessors, (12), 6 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-25 20:15:37,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:37,333 INFO L93 Difference]: Finished difference Result 188 states and 253 transitions. [2021-11-25 20:15:37,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:15:37,334 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 3.8461538461538463) internal successors, (50), 12 states have internal predecessors, (50), 8 states have call successors, (12), 3 states have call predecessors, (12), 6 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) Word has length 49 [2021-11-25 20:15:37,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:37,336 INFO L225 Difference]: With dead ends: 188 [2021-11-25 20:15:37,336 INFO L226 Difference]: Without dead ends: 188 [2021-11-25 20:15:37,337 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 133 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 26.4s TimeCoverageRelationStatistics Valid=92, Invalid=321, Unknown=7, NotChecked=0, Total=420 [2021-11-25 20:15:37,338 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 88 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 368 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:37,338 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 175 Invalid, 473 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 86 Invalid, 0 Unknown, 368 Unchecked, 0.2s Time] [2021-11-25 20:15:37,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-11-25 20:15:37,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 188. [2021-11-25 20:15:37,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 126 states have (on average 1.2777777777777777) internal successors, (161), 142 states have internal predecessors, (161), 26 states have call successors, (26), 13 states have call predecessors, (26), 20 states have return successors, (66), 32 states have call predecessors, (66), 26 states have call successors, (66) [2021-11-25 20:15:37,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 253 transitions. [2021-11-25 20:15:37,352 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 253 transitions. Word has length 49 [2021-11-25 20:15:37,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:37,353 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 253 transitions. [2021-11-25 20:15:37,353 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 3.8461538461538463) internal successors, (50), 12 states have internal predecessors, (50), 8 states have call successors, (12), 3 states have call predecessors, (12), 6 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-25 20:15:37,354 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 253 transitions. [2021-11-25 20:15:37,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-25 20:15:37,355 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:37,355 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:37,371 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (34)] Ended with exit code 0 [2021-11-25 20:15:37,608 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:37,782 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (35)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:37,980 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 20:15:37,980 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting maxErr1REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:15:37,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:37,980 INFO L85 PathProgramCache]: Analyzing trace with hash 1738803102, now seen corresponding path program 2 times [2021-11-25 20:15:37,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:15:37,981 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1714788948] [2021-11-25 20:15:37,981 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:15:37,981 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:15:37,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:15:37,981 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:15:37,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-25 20:15:38,163 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:15:38,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:15:38,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 20:15:38,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:38,570 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 21 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:15:38,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:39,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2021-11-25 20:15:39,715 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 21 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:15:39,715 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:15:39,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1714788948] [2021-11-25 20:15:39,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1714788948] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:15:39,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [668737893] [2021-11-25 20:15:39,715 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:15:39,716 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:15:39,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:15:39,716 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:15:39,718 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-25 20:15:40,008 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:15:40,009 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:15:40,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 20:15:40,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:40,532 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:15:40,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:40,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2021-11-25 20:15:41,056 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:15:41,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [668737893] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:15:41,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [356721770] [2021-11-25 20:15:41,057 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:15:41,057 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:41,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:41,059 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:41,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-25 20:15:41,249 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:15:41,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:15:41,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 20:15:41,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:41,436 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 21 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:15:41,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:42,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2021-11-25 20:15:42,365 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 21 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:15:42,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [356721770] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:15:42,365 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:15:42,365 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 8, 9, 9] total 24 [2021-11-25 20:15:42,366 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703895632] [2021-11-25 20:15:42,366 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:15:42,366 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-25 20:15:42,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:15:42,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-25 20:15:42,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:15:42,368 INFO L87 Difference]: Start difference. First operand 188 states and 253 transitions. Second operand has 25 states, 21 states have (on average 2.5714285714285716) internal successors, (54), 19 states have internal predecessors, (54), 9 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 9 states have call predecessors, (12), 6 states have call successors, (12) [2021-11-25 20:15:44,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:44,535 INFO L93 Difference]: Finished difference Result 192 states and 257 transitions. [2021-11-25 20:15:44,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:15:44,536 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 21 states have (on average 2.5714285714285716) internal successors, (54), 19 states have internal predecessors, (54), 9 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 9 states have call predecessors, (12), 6 states have call successors, (12) Word has length 39 [2021-11-25 20:15:44,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:44,538 INFO L225 Difference]: With dead ends: 192 [2021-11-25 20:15:44,538 INFO L226 Difference]: Without dead ends: 192 [2021-11-25 20:15:44,539 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 203 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=102, Invalid=654, Unknown=0, NotChecked=0, Total=756 [2021-11-25 20:15:44,539 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 97 mSDsluCounter, 637 mSDsCounter, 0 mSdLazyCounter, 575 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 708 SdHoareTripleChecker+Invalid, 685 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 575 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 88 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:44,540 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [99 Valid, 708 Invalid, 685 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 575 Invalid, 0 Unknown, 88 Unchecked, 2.0s Time] [2021-11-25 20:15:44,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-11-25 20:15:44,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 188. [2021-11-25 20:15:44,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 126 states have (on average 1.253968253968254) internal successors, (158), 142 states have internal predecessors, (158), 26 states have call successors, (26), 13 states have call predecessors, (26), 20 states have return successors, (66), 32 states have call predecessors, (66), 26 states have call successors, (66) [2021-11-25 20:15:44,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 250 transitions. [2021-11-25 20:15:44,555 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 250 transitions. Word has length 39 [2021-11-25 20:15:44,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:44,556 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 250 transitions. [2021-11-25 20:15:44,556 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 21 states have (on average 2.5714285714285716) internal successors, (54), 19 states have internal predecessors, (54), 9 states have call successors, (13), 6 states have call predecessors, (13), 6 states have return successors, (12), 9 states have call predecessors, (12), 6 states have call successors, (12) [2021-11-25 20:15:44,556 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 250 transitions. [2021-11-25 20:15:44,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 20:15:44,558 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:44,558 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 5, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1] [2021-11-25 20:15:44,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:44,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (38)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:44,982 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (37)] Ended with exit code 0 [2021-11-25 20:15:45,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:15:45,172 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:15:45,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:45,173 INFO L85 PathProgramCache]: Analyzing trace with hash -1760152854, now seen corresponding path program 3 times [2021-11-25 20:15:45,174 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:15:45,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [962399767] [2021-11-25 20:15:45,174 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:15:45,174 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:15:45,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:15:45,176 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:15:45,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-25 20:15:45,593 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:15:45,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:15:45,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 20:15:45,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:45,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:15:54,362 INFO L354 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-11-25 20:15:54,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 31 treesize of output 47 [2021-11-25 20:15:54,540 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 91 proven. 25 refuted. 5 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 20:15:54,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:56,851 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:15:56,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [962399767] [2021-11-25 20:15:56,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [962399767] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:56,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [624318086] [2021-11-25 20:15:56,852 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:15:56,852 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:15:56,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:15:56,853 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:15:56,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-25 20:15:57,358 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:15:57,358 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:15:57,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 20:15:57,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:06,099 INFO L354 Elim1Store]: treesize reduction 34, result has 38.2 percent of original size [2021-11-25 20:16:06,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-25 20:16:06,133 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 90 proven. 27 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-25 20:16:06,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:06,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [624318086] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:06,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [868692891] [2021-11-25 20:16:06,673 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:16:06,674 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:06,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:06,677 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:06,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-25 20:16:09,471 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:16:09,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:16:09,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 20:16:09,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:14,058 INFO L354 Elim1Store]: treesize reduction 34, result has 38.2 percent of original size [2021-11-25 20:16:14,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 23 treesize of output 37 [2021-11-25 20:16:14,087 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 90 proven. 24 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-25 20:16:14,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:14,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [868692891] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:14,558 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:16:14,558 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2021-11-25 20:16:14,558 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362512236] [2021-11-25 20:16:14,559 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:14,559 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 20:16:14,559 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:16:14,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 20:16:14,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=125, Unknown=5, NotChecked=0, Total=182 [2021-11-25 20:16:14,561 INFO L87 Difference]: Start difference. First operand 188 states and 250 transitions. Second operand has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 5 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 7 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-25 20:16:31,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:31,588 INFO L93 Difference]: Finished difference Result 230 states and 323 transitions. [2021-11-25 20:16:31,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:16:31,589 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 5 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 7 states have call predecessors, (9), 5 states have call successors, (9) Word has length 63 [2021-11-25 20:16:31,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:31,591 INFO L225 Difference]: With dead ends: 230 [2021-11-25 20:16:31,591 INFO L226 Difference]: Without dead ends: 230 [2021-11-25 20:16:31,592 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 169 SyntacticMatches, 25 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 39.9s TimeCoverageRelationStatistics Valid=122, Invalid=248, Unknown=10, NotChecked=0, Total=380 [2021-11-25 20:16:31,593 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 13 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 444 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 413 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:31,593 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 228 Invalid, 444 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 28 Invalid, 0 Unknown, 413 Unchecked, 0.1s Time] [2021-11-25 20:16:31,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-11-25 20:16:31,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 229. [2021-11-25 20:16:31,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 155 states have (on average 1.2258064516129032) internal successors, (190), 173 states have internal predecessors, (190), 32 states have call successors, (32), 15 states have call predecessors, (32), 26 states have return successors, (101), 40 states have call predecessors, (101), 32 states have call successors, (101) [2021-11-25 20:16:31,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 323 transitions. [2021-11-25 20:16:31,620 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 323 transitions. Word has length 63 [2021-11-25 20:16:31,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:31,620 INFO L470 AbstractCegarLoop]: Abstraction has 229 states and 323 transitions. [2021-11-25 20:16:31,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 5 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (9), 7 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-25 20:16:31,621 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 323 transitions. [2021-11-25 20:16:31,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-25 20:16:31,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:31,622 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-11-25 20:16:31,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (41)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:31,840 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (40)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:32,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:32,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:32,223 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:16:32,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:32,224 INFO L85 PathProgramCache]: Analyzing trace with hash -612022781, now seen corresponding path program 1 times [2021-11-25 20:16:32,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:16:32,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [668964903] [2021-11-25 20:16:32,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:32,224 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:16:32,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:16:32,225 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:16:32,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-25 20:16:32,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:32,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 20:16:32,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:32,478 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:16:32,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:16:32,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-11-25 20:16:32,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-11-25 20:16:33,082 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:16:33,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:33,547 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:16:33,547 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:16:33,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [668964903] [2021-11-25 20:16:33,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [668964903] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:33,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2047532031] [2021-11-25 20:16:33,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:33,548 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:16:33,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:16:33,548 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:16:33,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-25 20:16:33,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:33,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-25 20:16:33,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:33,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:16:34,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:16:34,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 20:16:34,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 20:16:34,729 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:16:34,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:35,181 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:16:35,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2047532031] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:35,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1032604186] [2021-11-25 20:16:35,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:35,181 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:35,181 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:35,182 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:35,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-25 20:16:35,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:16:35,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-25 20:16:35,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:35,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:16:35,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:16:35,925 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 20:16:35,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 20:16:35,952 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:16:35,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:36,430 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:16:36,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1032604186] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:36,430 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:16:36,431 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 15, 13, 15, 13] total 23 [2021-11-25 20:16:36,431 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380502424] [2021-11-25 20:16:36,431 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:36,431 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 20:16:36,431 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:16:36,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 20:16:36,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2021-11-25 20:16:36,432 INFO L87 Difference]: Start difference. First operand 229 states and 323 transitions. Second operand has 23 states, 20 states have (on average 2.5) internal successors, (50), 16 states have internal predecessors, (50), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (9), 8 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-25 20:16:37,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:37,636 INFO L93 Difference]: Finished difference Result 280 states and 405 transitions. [2021-11-25 20:16:37,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 20:16:37,637 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 20 states have (on average 2.5) internal successors, (50), 16 states have internal predecessors, (50), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (9), 8 states have call predecessors, (9), 4 states have call successors, (9) Word has length 38 [2021-11-25 20:16:37,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:37,640 INFO L225 Difference]: With dead ends: 280 [2021-11-25 20:16:37,641 INFO L226 Difference]: Without dead ends: 280 [2021-11-25 20:16:37,641 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 200 SyntacticMatches, 5 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=122, Invalid=748, Unknown=0, NotChecked=0, Total=870 [2021-11-25 20:16:37,645 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 77 mSDsluCounter, 1005 mSDsCounter, 0 mSdLazyCounter, 317 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 1080 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 71 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:37,645 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 1080 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 317 Invalid, 0 Unknown, 71 Unchecked, 0.8s Time] [2021-11-25 20:16:37,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2021-11-25 20:16:37,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 263. [2021-11-25 20:16:37,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 180 states have (on average 1.2277777777777779) internal successors, (221), 200 states have internal predecessors, (221), 36 states have call successors, (36), 18 states have call predecessors, (36), 31 states have return successors, (132), 44 states have call predecessors, (132), 36 states have call successors, (132) [2021-11-25 20:16:37,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 389 transitions. [2021-11-25 20:16:37,675 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 389 transitions. Word has length 38 [2021-11-25 20:16:37,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:37,675 INFO L470 AbstractCegarLoop]: Abstraction has 263 states and 389 transitions. [2021-11-25 20:16:37,675 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 20 states have (on average 2.5) internal successors, (50), 16 states have internal predecessors, (50), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (9), 8 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-25 20:16:37,676 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 389 transitions. [2021-11-25 20:16:37,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-25 20:16:37,677 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:37,678 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2021-11-25 20:16:37,721 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:37,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:38,104 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (44)] Ended with exit code 0 [2021-11-25 20:16:38,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 20:16:38,301 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting nondet_treeErr3REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:16:38,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:38,302 INFO L85 PathProgramCache]: Analyzing trace with hash -10871605, now seen corresponding path program 3 times [2021-11-25 20:16:38,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:16:38,302 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [266115946] [2021-11-25 20:16:38,302 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:16:38,302 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:16:38,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:16:38,303 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:16:38,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-25 20:16:38,698 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:16:38,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:16:38,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 20:16:38,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:38,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:16:39,103 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:16:39,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-11-25 20:16:39,342 INFO L354 Elim1Store]: treesize reduction 31, result has 13.9 percent of original size [2021-11-25 20:16:39,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 19 [2021-11-25 20:16:39,454 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 38 proven. 35 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:16:39,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:39,885 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-25 20:16:39,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 20 [2021-11-25 20:16:40,112 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:16:40,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [266115946] [2021-11-25 20:16:40,112 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [266115946] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:16:40,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1873556782] [2021-11-25 20:16:40,112 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:16:40,113 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:16:40,113 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:16:40,113 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:16:40,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (47)] Waiting until timeout for monitored process [2021-11-25 20:16:40,810 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:16:40,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:16:40,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 20:16:40,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:40,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:16:40,863 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:17:06,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:06,402 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:06,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:06,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 19 [2021-11-25 20:17:06,446 INFO L354 Elim1Store]: treesize reduction 16, result has 36.0 percent of original size [2021-11-25 20:17:06,446 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 48 [2021-11-25 20:17:06,479 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 33 proven. 40 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:17:06,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:14,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1873556782] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:17:14,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [82488744] [2021-11-25 20:17:14,067 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:17:14,067 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:14,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:14,068 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:14,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-25 20:17:16,022 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:17:16,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:17:16,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-25 20:17:16,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:16,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:17:22,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:22,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:22,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:22,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 19 [2021-11-25 20:17:22,835 INFO L354 Elim1Store]: treesize reduction 16, result has 36.0 percent of original size [2021-11-25 20:17:22,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 20:17:23,003 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 33 proven. 40 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:17:23,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:28,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [82488744] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:17:28,879 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:17:28,880 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 10] total 22 [2021-11-25 20:17:28,880 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124211456] [2021-11-25 20:17:28,880 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:28,880 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 20:17:28,880 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:17:28,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 20:17:28,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=583, Unknown=19, NotChecked=0, Total=702 [2021-11-25 20:17:28,882 INFO L87 Difference]: Start difference. First operand 263 states and 389 transitions. Second operand has 23 states, 22 states have (on average 2.6818181818181817) internal successors, (59), 19 states have internal predecessors, (59), 9 states have call successors, (14), 3 states have call predecessors, (14), 7 states have return successors, (13), 11 states have call predecessors, (13), 8 states have call successors, (13) [2021-11-25 20:17:54,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:54,658 INFO L93 Difference]: Finished difference Result 266 states and 400 transitions. [2021-11-25 20:17:54,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 20:17:54,659 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.6818181818181817) internal successors, (59), 19 states have internal predecessors, (59), 9 states have call successors, (14), 3 states have call predecessors, (14), 7 states have return successors, (13), 11 states have call predecessors, (13), 8 states have call successors, (13) Word has length 47 [2021-11-25 20:17:54,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:54,662 INFO L225 Difference]: With dead ends: 266 [2021-11-25 20:17:54,662 INFO L226 Difference]: Without dead ends: 266 [2021-11-25 20:17:54,663 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 117 SyntacticMatches, 7 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 69.1s TimeCoverageRelationStatistics Valid=146, Invalid=822, Unknown=24, NotChecked=0, Total=992 [2021-11-25 20:17:54,663 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 87 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 722 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 617 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:54,664 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 198 Invalid, 722 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 84 Invalid, 0 Unknown, 617 Unchecked, 0.2s Time] [2021-11-25 20:17:54,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-11-25 20:17:54,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 265. [2021-11-25 20:17:54,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 181 states have (on average 1.2209944751381216) internal successors, (221), 203 states have internal predecessors, (221), 36 states have call successors, (36), 18 states have call predecessors, (36), 32 states have return successors, (142), 43 states have call predecessors, (142), 36 states have call successors, (142) [2021-11-25 20:17:54,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 399 transitions. [2021-11-25 20:17:54,682 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 399 transitions. Word has length 47 [2021-11-25 20:17:54,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:54,683 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 399 transitions. [2021-11-25 20:17:54,683 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.6818181818181817) internal successors, (59), 19 states have internal predecessors, (59), 9 states have call successors, (14), 3 states have call predecessors, (14), 7 states have return successors, (13), 11 states have call predecessors, (13), 8 states have call successors, (13) [2021-11-25 20:17:54,683 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 399 transitions. [2021-11-25 20:17:54,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-25 20:17:54,685 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:54,685 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2021-11-25 20:17:54,701 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (47)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:54,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (46)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:55,115 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2021-11-25 20:17:55,290 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:55,291 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting nondet_treeErr4REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:17:55,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:55,291 INFO L85 PathProgramCache]: Analyzing trace with hash -765292755, now seen corresponding path program 2 times [2021-11-25 20:17:55,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:17:55,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [935789924] [2021-11-25 20:17:55,292 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:17:55,292 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:17:55,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:17:55,293 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:17:55,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2021-11-25 20:17:55,774 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:17:55,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:17:55,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 451 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:17:55,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:56,090 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-11-25 20:17:56,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 28 [2021-11-25 20:17:56,096 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 75 proven. 15 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-25 20:17:56,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:56,283 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:17:56,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [935789924] [2021-11-25 20:17:56,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [935789924] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:17:56,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2114845395] [2021-11-25 20:17:56,284 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:17:56,284 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:17:56,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:17:56,285 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:17:56,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (50)] Waiting until timeout for monitored process [2021-11-25 20:17:56,894 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:17:56,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [145089478] [2021-11-25 20:17:56,894 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:17:56,895 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:56,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:56,896 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:56,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-25 20:17:56,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (50)] Forceful destruction successful, exit code 1 [2021-11-25 20:17:57,197 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:17:57,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:17:57,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 451 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 20:17:57,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:18:03,529 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-11-25 20:18:03,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 19 [2021-11-25 20:18:03,541 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 7 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2021-11-25 20:18:03,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:18:03,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [145089478] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:18:03,737 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:18:03,737 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 6 [2021-11-25 20:18:03,737 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747090489] [2021-11-25 20:18:03,737 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:18:03,738 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:18:03,738 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:18:03,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:18:03,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=38, Unknown=1, NotChecked=0, Total=56 [2021-11-25 20:18:03,739 INFO L87 Difference]: Start difference. First operand 265 states and 399 transitions. Second operand has 7 states, 6 states have (on average 5.333333333333333) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-25 20:18:12,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:18:12,097 INFO L93 Difference]: Finished difference Result 267 states and 401 transitions. [2021-11-25 20:18:12,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:18:12,099 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 5.333333333333333) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 63 [2021-11-25 20:18:12,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:18:12,102 INFO L225 Difference]: With dead ends: 267 [2021-11-25 20:18:12,102 INFO L226 Difference]: Without dead ends: 267 [2021-11-25 20:18:12,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 123 SyntacticMatches, 9 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=38, Invalid=70, Unknown=2, NotChecked=0, Total=110 [2021-11-25 20:18:12,103 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 46 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 179 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:18:12,104 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 104 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 93 Invalid, 0 Unknown, 179 Unchecked, 0.2s Time] [2021-11-25 20:18:12,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2021-11-25 20:18:12,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 266. [2021-11-25 20:18:12,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 182 states have (on average 1.2252747252747254) internal successors, (223), 203 states have internal predecessors, (223), 36 states have call successors, (36), 18 states have call predecessors, (36), 32 states have return successors, (142), 44 states have call predecessors, (142), 36 states have call successors, (142) [2021-11-25 20:18:12,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 401 transitions. [2021-11-25 20:18:12,122 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 401 transitions. Word has length 63 [2021-11-25 20:18:12,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:18:12,123 INFO L470 AbstractCegarLoop]: Abstraction has 266 states and 401 transitions. [2021-11-25 20:18:12,123 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 5.333333333333333) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (10), 2 states have call predecessors, (10), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-25 20:18:12,123 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 401 transitions. [2021-11-25 20:18:12,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 20:18:12,125 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:18:12,125 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2021-11-25 20:18:12,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (49)] Forceful destruction successful, exit code 0 [2021-11-25 20:18:12,365 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-25 20:18:12,542 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:18:12,542 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:18:12,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:18:12,543 INFO L85 PathProgramCache]: Analyzing trace with hash -190701768, now seen corresponding path program 2 times [2021-11-25 20:18:12,543 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:18:12,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1293888041] [2021-11-25 20:18:12,543 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:18:12,543 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:18:12,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:18:12,544 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:18:12,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (52)] Waiting until timeout for monitored process [2021-11-25 20:18:12,962 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:18:12,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:18:12,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 20:18:12,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:18:12,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:18:13,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:18:17,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:18:17,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 20:18:17,421 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:18:17,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-11-25 20:18:23,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:18:23,774 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 20:18:23,791 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:18:23,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 17 [2021-11-25 20:18:23,802 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 23 proven. 36 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 20:18:23,802 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:18:26,140 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:18:26,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1293888041] [2021-11-25 20:18:26,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1293888041] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:18:26,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1867457620] [2021-11-25 20:18:26,141 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:18:26,141 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:18:26,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:18:26,144 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:18:26,156 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (53)] Waiting until timeout for monitored process [2021-11-25 20:18:26,688 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:18:26,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:18:26,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 20:18:26,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:18:26,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:18:26,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:18:33,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:18:33,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 20:18:33,040 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:18:33,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-11-25 20:18:39,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:18:39,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 20:18:39,351 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:18:39,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-11-25 20:18:39,365 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 21 proven. 46 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:18:39,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:18:39,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1867457620] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:18:39,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772881768] [2021-11-25 20:18:39,805 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:18:39,805 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:18:39,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:18:39,806 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:18:39,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-25 20:18:40,149 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:18:40,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:18:40,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 20:18:40,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:18:40,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:18:46,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:18:46,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 20:18:46,511 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:18:46,512 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 17 [2021-11-25 20:18:46,669 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-25 20:18:46,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2021-11-25 20:18:46,697 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 21 proven. 45 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 20:18:46,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:18:47,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [772881768] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:18:47,409 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:18:47,409 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 7 [2021-11-25 20:18:47,409 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543412613] [2021-11-25 20:18:47,409 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:18:47,410 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:18:47,410 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:18:47,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:18:47,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=82, Unknown=1, NotChecked=0, Total=110 [2021-11-25 20:18:47,411 INFO L87 Difference]: Start difference. First operand 266 states and 401 transitions. Second operand has 8 states, 7 states have (on average 5.0) internal successors, (35), 8 states have internal predecessors, (35), 5 states have call successors, (11), 3 states have call predecessors, (11), 4 states have return successors, (9), 3 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-25 20:18:47,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:18:47,863 INFO L93 Difference]: Finished difference Result 267 states and 402 transitions. [2021-11-25 20:18:47,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:18:47,864 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.0) internal successors, (35), 8 states have internal predecessors, (35), 5 states have call successors, (11), 3 states have call predecessors, (11), 4 states have return successors, (9), 3 states have call predecessors, (9), 4 states have call successors, (9) Word has length 49 [2021-11-25 20:18:47,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:18:47,867 INFO L225 Difference]: With dead ends: 267 [2021-11-25 20:18:47,867 INFO L226 Difference]: Without dead ends: 267 [2021-11-25 20:18:47,867 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 123 SyntacticMatches, 19 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 31.6s TimeCoverageRelationStatistics Valid=41, Invalid=114, Unknown=1, NotChecked=0, Total=156 [2021-11-25 20:18:47,868 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 41 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 147 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:18:47,868 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 130 Invalid, 323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 167 Invalid, 0 Unknown, 147 Unchecked, 0.3s Time] [2021-11-25 20:18:47,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2021-11-25 20:18:47,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 267. [2021-11-25 20:18:47,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 183 states have (on average 1.2240437158469946) internal successors, (224), 203 states have internal predecessors, (224), 36 states have call successors, (36), 18 states have call predecessors, (36), 32 states have return successors, (142), 45 states have call predecessors, (142), 36 states have call successors, (142) [2021-11-25 20:18:47,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 402 transitions. [2021-11-25 20:18:47,888 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 402 transitions. Word has length 49 [2021-11-25 20:18:47,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:18:47,889 INFO L470 AbstractCegarLoop]: Abstraction has 267 states and 402 transitions. [2021-11-25 20:18:47,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.0) internal successors, (35), 8 states have internal predecessors, (35), 5 states have call successors, (11), 3 states have call predecessors, (11), 4 states have return successors, (9), 3 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-25 20:18:47,890 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 402 transitions. [2021-11-25 20:18:47,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 20:18:47,891 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:18:47,892 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2021-11-25 20:18:47,933 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Ended with exit code 0 [2021-11-25 20:18:48,115 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (52)] Forceful destruction successful, exit code 0 [2021-11-25 20:18:48,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (53)] Forceful destruction successful, exit code 0 [2021-11-25 20:18:48,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 20:18:48,506 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting nondet_treeErr4REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:18:48,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:18:48,508 INFO L85 PathProgramCache]: Analyzing trace with hash 1219497203, now seen corresponding path program 3 times [2021-11-25 20:18:48,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:18:48,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1978635145] [2021-11-25 20:18:48,509 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:18:48,510 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:18:48,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:18:48,511 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:18:48,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (55)] Waiting until timeout for monitored process [2021-11-25 20:18:48,910 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:18:48,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:18:48,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:18:48,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:18:48,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:19:03,598 INFO L354 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-11-25 20:19:03,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 27 treesize of output 43 [2021-11-25 20:19:03,727 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 11 proven. 33 refuted. 2 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 20:19:03,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:19:04,150 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:19:04,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1978635145] [2021-11-25 20:19:04,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1978635145] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:19:04,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [965254652] [2021-11-25 20:19:04,151 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:19:04,151 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:19:04,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:19:04,152 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:19:04,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (56)] Waiting until timeout for monitored process [2021-11-25 20:19:04,564 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:19:04,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55042371] [2021-11-25 20:19:04,564 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:19:04,565 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:19:04,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:19:04,566 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:19:04,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-25 20:19:04,573 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (56)] Forceful destruction successful, exit code 1 [2021-11-25 20:19:07,939 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:19:07,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:19:07,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 20:19:07,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:19:16,404 INFO L354 Elim1Store]: treesize reduction 42, result has 33.3 percent of original size [2021-11-25 20:19:16,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 45 [2021-11-25 20:19:16,431 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 8 proven. 38 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 20:19:16,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:19:16,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [55042371] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:19:16,747 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:19:16,747 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-11-25 20:19:16,747 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945246397] [2021-11-25 20:19:16,748 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:19:16,748 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 20:19:16,748 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:19:16,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 20:19:16,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=73, Unknown=7, NotChecked=0, Total=110 [2021-11-25 20:19:16,749 INFO L87 Difference]: Start difference. First operand 267 states and 402 transitions. Second operand has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 10 states have internal predecessors, (40), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (11), 5 states have call predecessors, (11), 6 states have call successors, (11) [2021-11-25 20:19:28,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:19:28,084 INFO L93 Difference]: Finished difference Result 315 states and 490 transitions. [2021-11-25 20:19:28,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:19:28,085 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 10 states have internal predecessors, (40), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (11), 5 states have call predecessors, (11), 6 states have call successors, (11) Word has length 45 [2021-11-25 20:19:28,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:19:28,087 INFO L225 Difference]: With dead ends: 315 [2021-11-25 20:19:28,087 INFO L226 Difference]: Without dead ends: 315 [2021-11-25 20:19:28,088 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 75 SyntacticMatches, 23 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 34.0s TimeCoverageRelationStatistics Valid=48, Invalid=100, Unknown=8, NotChecked=0, Total=156 [2021-11-25 20:19:28,088 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 7 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 270 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:19:28,090 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 172 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 270 Unchecked, 0.0s Time] [2021-11-25 20:19:28,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2021-11-25 20:19:28,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 314. [2021-11-25 20:19:28,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 314 states, 216 states have (on average 1.1990740740740742) internal successors, (259), 238 states have internal predecessors, (259), 43 states have call successors, (43), 20 states have call predecessors, (43), 39 states have return successors, (186), 55 states have call predecessors, (186), 43 states have call successors, (186) [2021-11-25 20:19:28,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 488 transitions. [2021-11-25 20:19:28,109 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 488 transitions. Word has length 45 [2021-11-25 20:19:28,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:19:28,109 INFO L470 AbstractCegarLoop]: Abstraction has 314 states and 488 transitions. [2021-11-25 20:19:28,110 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.444444444444445) internal successors, (40), 10 states have internal predecessors, (40), 7 states have call successors, (10), 2 states have call predecessors, (10), 5 states have return successors, (11), 5 states have call predecessors, (11), 6 states have call successors, (11) [2021-11-25 20:19:28,110 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 488 transitions. [2021-11-25 20:19:28,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 20:19:28,111 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:19:28,111 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2021-11-25 20:19:28,157 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-25 20:19:28,373 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (55)] Forceful destruction successful, exit code 0 [2021-11-25 20:19:28,538 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:19:28,538 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:19:28,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:19:28,540 INFO L85 PathProgramCache]: Analyzing trace with hash 1219497204, now seen corresponding path program 3 times [2021-11-25 20:19:28,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:19:28,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [812892394] [2021-11-25 20:19:28,542 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:19:28,542 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:19:28,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:19:28,544 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:19:28,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (58)] Waiting until timeout for monitored process [2021-11-25 20:19:28,975 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:19:28,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:19:28,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 20:19:28,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:19:29,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:19:29,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:19:35,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:19:35,500 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-11-25 20:19:35,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2021-11-25 20:19:35,521 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:19:35,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-11-25 20:19:35,591 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 6 proven. 54 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 20:19:35,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:19:41,934 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:19:41,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [812892394] [2021-11-25 20:19:41,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [812892394] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:19:41,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1945870890] [2021-11-25 20:19:41,935 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:19:41,935 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:19:41,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:19:41,936 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:19:41,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (59)] Waiting until timeout for monitored process [2021-11-25 20:19:42,362 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:19:42,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1719208860] [2021-11-25 20:19:42,363 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:19:42,363 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:19:42,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:19:42,364 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:19:42,372 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-25 20:19:42,373 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (59)] Forceful destruction successful, exit code 1 [2021-11-25 20:19:44,897 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:19:44,897 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:19:44,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 20:19:44,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:19:44,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:20:00,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:00,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:00,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:00,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 19 [2021-11-25 20:20:00,214 INFO L354 Elim1Store]: treesize reduction 16, result has 36.0 percent of original size [2021-11-25 20:20:00,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 49 [2021-11-25 20:20:00,242 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 6 proven. 55 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:20:00,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:20:05,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1719208860] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:20:05,384 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:20:05,384 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2021-11-25 20:20:05,384 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302056753] [2021-11-25 20:20:05,384 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:20:05,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 20:20:05,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:20:05,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 20:20:05,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=188, Unknown=13, NotChecked=0, Total=240 [2021-11-25 20:20:05,386 INFO L87 Difference]: Start difference. First operand 314 states and 488 transitions. Second operand has 13 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 13 states have internal predecessors, (43), 7 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (11), 6 states have call predecessors, (11), 6 states have call successors, (11) [2021-11-25 20:20:54,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:20:54,041 INFO L93 Difference]: Finished difference Result 398 states and 676 transitions. [2021-11-25 20:20:54,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 20:20:54,043 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 13 states have internal predecessors, (43), 7 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (11), 6 states have call predecessors, (11), 6 states have call successors, (11) Word has length 45 [2021-11-25 20:20:54,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:20:54,047 INFO L225 Difference]: With dead ends: 398 [2021-11-25 20:20:54,047 INFO L226 Difference]: Without dead ends: 398 [2021-11-25 20:20:54,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 77 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 79.4s TimeCoverageRelationStatistics Valid=117, Invalid=403, Unknown=32, NotChecked=0, Total=552 [2021-11-25 20:20:54,048 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 93 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 735 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 540 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:20:54,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 184 Invalid, 735 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 172 Invalid, 0 Unknown, 540 Unchecked, 0.4s Time] [2021-11-25 20:20:54,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2021-11-25 20:20:54,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 394. [2021-11-25 20:20:54,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 394 states, 272 states have (on average 1.1727941176470589) internal successors, (319), 298 states have internal predecessors, (319), 55 states have call successors, (55), 24 states have call predecessors, (55), 51 states have return successors, (259), 71 states have call predecessors, (259), 55 states have call successors, (259) [2021-11-25 20:20:54,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 633 transitions. [2021-11-25 20:20:54,080 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 633 transitions. Word has length 45 [2021-11-25 20:20:54,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:20:54,080 INFO L470 AbstractCegarLoop]: Abstraction has 394 states and 633 transitions. [2021-11-25 20:20:54,081 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 13 states have internal predecessors, (43), 7 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (11), 6 states have call predecessors, (11), 6 states have call successors, (11) [2021-11-25 20:20:54,081 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 633 transitions. [2021-11-25 20:20:54,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 20:20:54,083 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:20:54,083 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2021-11-25 20:20:54,098 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (58)] Forceful destruction successful, exit code 0 [2021-11-25 20:20:54,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2021-11-25 20:20:54,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:20:54,498 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:20:54,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:20:54,499 INFO L85 PathProgramCache]: Analyzing trace with hash 780603380, now seen corresponding path program 4 times [2021-11-25 20:20:54,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:20:54,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2095288817] [2021-11-25 20:20:54,499 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:20:54,499 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:20:54,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:20:54,501 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:20:54,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (61)] Waiting until timeout for monitored process [2021-11-25 20:20:54,840 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:20:54,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:20:54,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 20:20:54,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:20:54,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:20:54,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:20:57,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:20:57,344 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-11-25 20:20:57,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2021-11-25 20:20:57,361 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:20:57,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-11-25 20:20:57,473 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 6 proven. 45 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:20:57,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:01,691 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:21:01,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2095288817] [2021-11-25 20:21:01,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2095288817] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:01,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1957862112] [2021-11-25 20:21:01,692 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:21:01,692 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:21:01,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:21:01,693 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:21:01,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (62)] Waiting until timeout for monitored process [2021-11-25 20:21:02,208 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:21:02,209 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:21:02,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 20:21:02,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:02,240 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:21:02,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:21:04,623 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:04,661 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-11-25 20:21:04,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2021-11-25 20:21:04,679 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:21:04,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 18 [2021-11-25 20:21:04,738 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 6 proven. 45 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:21:04,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:10,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1957862112] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:10,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260523175] [2021-11-25 20:21:10,090 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:21:10,090 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:10,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:21:10,091 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:21:10,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-25 20:21:10,379 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:21:10,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:21:10,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 20:21:10,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:10,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:21:14,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:14,841 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-11-25 20:21:14,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2021-11-25 20:21:14,868 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:21:14,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-11-25 20:21:14,958 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 6 proven. 45 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:21:14,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:18,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260523175] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:18,778 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:21:18,779 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 8 [2021-11-25 20:21:18,779 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321847887] [2021-11-25 20:21:18,779 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:21:18,779 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 20:21:18,779 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:21:18,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 20:21:18,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=142, Unknown=3, NotChecked=0, Total=182 [2021-11-25 20:21:18,780 INFO L87 Difference]: Start difference. First operand 394 states and 633 transitions. Second operand has 9 states, 8 states have (on average 3.5) internal successors, (28), 8 states have internal predecessors, (28), 6 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-25 20:21:23,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:23,281 INFO L93 Difference]: Finished difference Result 411 states and 666 transitions. [2021-11-25 20:21:23,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:21:23,282 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 8 states have internal predecessors, (28), 6 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) Word has length 45 [2021-11-25 20:21:23,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:23,287 INFO L225 Difference]: With dead ends: 411 [2021-11-25 20:21:23,287 INFO L226 Difference]: Without dead ends: 411 [2021-11-25 20:21:23,288 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 137 SyntacticMatches, 9 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 24.4s TimeCoverageRelationStatistics Valid=57, Invalid=178, Unknown=5, NotChecked=0, Total=240 [2021-11-25 20:21:23,288 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 44 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 239 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:23,289 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 160 Invalid, 408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 160 Invalid, 0 Unknown, 239 Unchecked, 0.4s Time] [2021-11-25 20:21:23,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 411 states. [2021-11-25 20:21:23,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 411 to 410. [2021-11-25 20:21:23,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 410 states, 283 states have (on average 1.1696113074204948) internal successors, (331), 310 states have internal predecessors, (331), 58 states have call successors, (58), 25 states have call predecessors, (58), 53 states have return successors, (276), 74 states have call predecessors, (276), 58 states have call successors, (276) [2021-11-25 20:21:23,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 410 states to 410 states and 665 transitions. [2021-11-25 20:21:23,332 INFO L78 Accepts]: Start accepts. Automaton has 410 states and 665 transitions. Word has length 45 [2021-11-25 20:21:23,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:23,333 INFO L470 AbstractCegarLoop]: Abstraction has 410 states and 665 transitions. [2021-11-25 20:21:23,333 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 8 states have internal predecessors, (28), 6 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-25 20:21:23,333 INFO L276 IsEmpty]: Start isEmpty. Operand 410 states and 665 transitions. [2021-11-25 20:21:23,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 20:21:23,336 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:23,336 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:23,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (61)] Forceful destruction successful, exit code 0 [2021-11-25 20:21:23,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (62)] Forceful destruction successful, exit code 0 [2021-11-25 20:21:23,793 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-25 20:21:23,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:23,955 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:21:23,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:23,955 INFO L85 PathProgramCache]: Analyzing trace with hash -407980419, now seen corresponding path program 2 times [2021-11-25 20:21:23,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:21:23,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [413309730] [2021-11-25 20:21:23,956 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:21:23,956 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:21:23,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:21:23,957 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:21:23,958 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (64)] Waiting until timeout for monitored process [2021-11-25 20:21:24,319 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:21:24,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:21:24,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-25 20:21:24,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:24,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:21:24,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:21:24,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:21:24,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:24,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 20:21:24,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:24,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 20:21:24,999 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:21:25,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 23 [2021-11-25 20:21:25,086 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-25 20:21:25,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 20:21:25,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:25,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 20:21:25,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-11-25 20:21:25,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-11-25 20:21:25,687 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 6 proven. 32 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:21:25,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:27,623 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:21:27,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [413309730] [2021-11-25 20:21:27,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [413309730] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:27,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1884717684] [2021-11-25 20:21:27,623 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:21:27,623 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:21:27,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:21:27,625 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:21:27,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (65)] Waiting until timeout for monitored process [2021-11-25 20:21:28,144 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:21:28,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:21:28,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-25 20:21:28,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:28,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:21:28,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:21:28,439 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:21:28,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:28,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 20:21:28,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:28,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 20:21:28,945 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:21:28,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-11-25 20:21:29,056 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:29,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 20:21:29,072 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:29,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 20:21:29,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 20:21:29,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 20:21:29,677 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 6 proven. 30 refuted. 2 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:21:29,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:31,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1884717684] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:31,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1769838188] [2021-11-25 20:21:31,580 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 20:21:31,580 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:31,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:21:31,581 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:21:31,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-25 20:21:31,865 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-25 20:21:31,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:21:31,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-25 20:21:31,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:32,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:21:32,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:21:32,368 WARN L860 $PredicateComparison]: unable to prove that (exists ((nondet_tree_~n~0.base (_ BitVec 32))) (and (exists ((v_ArrVal_4863 (Array (_ BitVec 32) (_ BitVec 32)))) (= (store |c_old(#memory_$Pointer$.base)| nondet_tree_~n~0.base v_ArrVal_4863) |c_#memory_$Pointer$.base|)) (= (_ bv0 1) (bvneg (bvneg (select |c_old(#valid)| nondet_tree_~n~0.base)))) (exists ((v_ArrVal_4862 (Array (_ BitVec 32) (_ BitVec 32)))) (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| nondet_tree_~n~0.base v_ArrVal_4862))))) is different from true [2021-11-25 20:21:32,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:32,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 20:21:32,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:32,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2021-11-25 20:21:32,469 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:21:32,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-11-25 20:21:32,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:32,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 20:21:32,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:21:32,506 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 20:21:32,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 20:21:32,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 20:21:32,729 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 6 proven. 23 refuted. 0 times theorem prover too weak. 3 trivial. 9 not checked. [2021-11-25 20:21:32,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:34,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1769838188] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:34,716 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:21:34,716 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 22] total 32 [2021-11-25 20:21:34,716 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322238917] [2021-11-25 20:21:34,716 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:21:34,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 20:21:34,717 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:21:34,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 20:21:34,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=884, Unknown=19, NotChecked=60, Total=1056 [2021-11-25 20:21:34,718 INFO L87 Difference]: Start difference. First operand 410 states and 665 transitions. Second operand has 32 states, 29 states have (on average 1.7241379310344827) internal successors, (50), 23 states have internal predecessors, (50), 9 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (9), 7 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-25 20:21:38,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:38,890 INFO L93 Difference]: Finished difference Result 435 states and 694 transitions. [2021-11-25 20:21:38,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 20:21:38,891 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 1.7241379310344827) internal successors, (50), 23 states have internal predecessors, (50), 9 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (9), 7 states have call predecessors, (9), 6 states have call successors, (9) Word has length 45 [2021-11-25 20:21:38,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:38,895 INFO L225 Difference]: With dead ends: 435 [2021-11-25 20:21:38,895 INFO L226 Difference]: Without dead ends: 435 [2021-11-25 20:21:38,897 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 142 SyntacticMatches, 14 SemanticMatches, 44 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 583 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=204, Invalid=1751, Unknown=29, NotChecked=86, Total=2070 [2021-11-25 20:21:38,897 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 114 mSDsluCounter, 483 mSDsCounter, 0 mSdLazyCounter, 1509 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 566 SdHoareTripleChecker+Invalid, 1855 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 1509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 309 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:38,898 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [120 Valid, 566 Invalid, 1855 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 1509 Invalid, 0 Unknown, 309 Unchecked, 3.2s Time] [2021-11-25 20:21:38,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 435 states. [2021-11-25 20:21:38,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 435 to 430. [2021-11-25 20:21:38,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 430 states, 298 states have (on average 1.167785234899329) internal successors, (348), 325 states have internal predecessors, (348), 61 states have call successors, (61), 27 states have call predecessors, (61), 55 states have return successors, (280), 77 states have call predecessors, (280), 61 states have call successors, (280) [2021-11-25 20:21:38,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 689 transitions. [2021-11-25 20:21:38,930 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 689 transitions. Word has length 45 [2021-11-25 20:21:38,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:38,930 INFO L470 AbstractCegarLoop]: Abstraction has 430 states and 689 transitions. [2021-11-25 20:21:38,931 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 1.7241379310344827) internal successors, (50), 23 states have internal predecessors, (50), 9 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (9), 7 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-25 20:21:38,931 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 689 transitions. [2021-11-25 20:21:38,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 20:21:38,933 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:38,933 INFO L514 BasicCegarLoop]: trace histogram [8, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1] [2021-11-25 20:21:38,968 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2021-11-25 20:21:39,156 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (65)] Forceful destruction successful, exit code 0 [2021-11-25 20:21:39,361 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (64)] Forceful destruction successful, exit code 0 [2021-11-25 20:21:39,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:21:39,553 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting nondet_treeErr4REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:21:39,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:39,553 INFO L85 PathProgramCache]: Analyzing trace with hash -880124585, now seen corresponding path program 4 times [2021-11-25 20:21:39,554 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:21:39,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [85181221] [2021-11-25 20:21:39,554 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:21:39,554 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:21:39,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:21:39,555 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:21:39,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (67)] Waiting until timeout for monitored process [2021-11-25 20:21:40,074 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:21:40,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:21:40,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 20:21:40,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:40,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:21:44,952 INFO L354 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-11-25 20:21:44,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 27 treesize of output 43 [2021-11-25 20:21:45,153 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 90 proven. 34 refuted. 6 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 20:21:45,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:47,390 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:21:47,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [85181221] [2021-11-25 20:21:47,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [85181221] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:47,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1126402746] [2021-11-25 20:21:47,391 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:21:47,391 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:21:47,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:21:47,392 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:21:47,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (68)] Waiting until timeout for monitored process [2021-11-25 20:21:48,082 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:21:48,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:21:48,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 20:21:48,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:48,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:21:54,847 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:21:54,886 INFO L354 Elim1Store]: treesize reduction 24, result has 46.7 percent of original size [2021-11-25 20:21:54,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 33 [2021-11-25 20:21:54,935 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 90 proven. 40 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 20:21:54,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:55,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1126402746] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:55,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855351881] [2021-11-25 20:21:55,424 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:21:55,424 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:55,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:21:55,425 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:21:55,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2021-11-25 20:21:55,779 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:21:55,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:21:55,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 20:21:55,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:00,454 INFO L354 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2021-11-25 20:22:00,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 26 treesize of output 42 [2021-11-25 20:22:00,675 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 90 proven. 33 refuted. 5 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-25 20:22:00,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:22:05,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855351881] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:22:05,042 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:22:05,042 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 9 [2021-11-25 20:22:05,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884345856] [2021-11-25 20:22:05,043 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:22:05,043 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 20:22:05,043 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:22:05,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 20:22:05,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=147, Unknown=7, NotChecked=0, Total=210 [2021-11-25 20:22:05,044 INFO L87 Difference]: Start difference. First operand 430 states and 689 transitions. Second operand has 10 states, 9 states have (on average 4.777777777777778) internal successors, (43), 9 states have internal predecessors, (43), 5 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 5 states have call successors, (10) [2021-11-25 20:22:13,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:13,215 INFO L93 Difference]: Finished difference Result 432 states and 691 transitions. [2021-11-25 20:22:13,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 20:22:13,216 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.777777777777778) internal successors, (43), 9 states have internal predecessors, (43), 5 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 5 states have call successors, (10) Word has length 65 [2021-11-25 20:22:13,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:13,220 INFO L225 Difference]: With dead ends: 432 [2021-11-25 20:22:13,220 INFO L226 Difference]: Without dead ends: 432 [2021-11-25 20:22:13,221 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 173 SyntacticMatches, 18 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 29.0s TimeCoverageRelationStatistics Valid=82, Invalid=183, Unknown=7, NotChecked=0, Total=272 [2021-11-25 20:22:13,221 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 51 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 316 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:13,221 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 134 Invalid, 408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 84 Invalid, 0 Unknown, 316 Unchecked, 0.2s Time] [2021-11-25 20:22:13,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2021-11-25 20:22:13,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 430. [2021-11-25 20:22:13,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 430 states, 298 states have (on average 1.167785234899329) internal successors, (348), 325 states have internal predecessors, (348), 61 states have call successors, (61), 27 states have call predecessors, (61), 55 states have return successors, (280), 77 states have call predecessors, (280), 61 states have call successors, (280) [2021-11-25 20:22:13,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 689 transitions. [2021-11-25 20:22:13,248 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 689 transitions. Word has length 65 [2021-11-25 20:22:13,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:13,249 INFO L470 AbstractCegarLoop]: Abstraction has 430 states and 689 transitions. [2021-11-25 20:22:13,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 4.777777777777778) internal successors, (43), 9 states have internal predecessors, (43), 5 states have call successors, (11), 2 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 5 states have call successors, (10) [2021-11-25 20:22:13,249 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 689 transitions. [2021-11-25 20:22:13,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 20:22:13,252 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:13,252 INFO L514 BasicCegarLoop]: trace histogram [6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2021-11-25 20:22:13,273 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (67)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:13,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (68)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:13,705 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:13,866 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:13,866 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:22:13,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:13,866 INFO L85 PathProgramCache]: Analyzing trace with hash 864934772, now seen corresponding path program 5 times [2021-11-25 20:22:13,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:22:13,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1563888389] [2021-11-25 20:22:13,867 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-25 20:22:13,867 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:22:13,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:22:13,869 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:22:13,908 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (70)] Waiting until timeout for monitored process [2021-11-25 20:22:14,401 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-25 20:22:14,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:22:14,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 20:22:14,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:14,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:22:27,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:27,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:27,361 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-25 20:22:27,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 19 [2021-11-25 20:22:27,376 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:22:27,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 34 [2021-11-25 20:22:27,424 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 11 proven. 50 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:22:27,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:22:30,348 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:22:30,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1563888389] [2021-11-25 20:22:30,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1563888389] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:22:30,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [751847353] [2021-11-25 20:22:30,349 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-25 20:22:30,349 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:22:30,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:22:30,350 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:22:30,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (71)] Waiting until timeout for monitored process [2021-11-25 20:22:30,835 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:22:30,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742006870] [2021-11-25 20:22:30,836 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-25 20:22:30,836 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:30,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:22:30,837 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:22:30,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (71)] Forceful destruction successful, exit code 1 [2021-11-25 20:22:30,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2021-11-25 20:22:32,281 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-25 20:22:32,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:22:32,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 20:22:32,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:32,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:22:51,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:51,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:51,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:22:51,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 19 [2021-11-25 20:22:51,285 INFO L354 Elim1Store]: treesize reduction 16, result has 36.0 percent of original size [2021-11-25 20:22:51,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 31 [2021-11-25 20:22:51,296 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 11 proven. 50 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:22:51,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:22:56,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [742006870] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:22:56,517 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:22:56,517 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2021-11-25 20:22:56,517 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428948980] [2021-11-25 20:22:56,517 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:22:56,517 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 20:22:56,518 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:22:56,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 20:22:56,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=164, Unknown=10, NotChecked=0, Total=210 [2021-11-25 20:22:56,518 INFO L87 Difference]: Start difference. First operand 430 states and 689 transitions. Second operand has 12 states, 11 states have (on average 3.272727272727273) internal successors, (36), 12 states have internal predecessors, (36), 7 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-25 20:23:15,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:23:15,129 INFO L93 Difference]: Finished difference Result 431 states and 690 transitions. [2021-11-25 20:23:15,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:23:15,130 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.272727272727273) internal successors, (36), 12 states have internal predecessors, (36), 7 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) Word has length 45 [2021-11-25 20:23:15,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:23:15,135 INFO L225 Difference]: With dead ends: 431 [2021-11-25 20:23:15,135 INFO L226 Difference]: Without dead ends: 431 [2021-11-25 20:23:15,135 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 73 SyntacticMatches, 7 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 55.9s TimeCoverageRelationStatistics Valid=70, Invalid=253, Unknown=19, NotChecked=0, Total=342 [2021-11-25 20:23:15,136 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 81 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 529 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 366 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:23:15,136 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 147 Invalid, 529 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 142 Invalid, 0 Unknown, 366 Unchecked, 0.3s Time] [2021-11-25 20:23:15,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 431 states. [2021-11-25 20:23:15,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 431 to 430. [2021-11-25 20:23:15,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 430 states, 298 states have (on average 1.167785234899329) internal successors, (348), 325 states have internal predecessors, (348), 61 states have call successors, (61), 27 states have call predecessors, (61), 55 states have return successors, (280), 77 states have call predecessors, (280), 61 states have call successors, (280) [2021-11-25 20:23:15,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 689 transitions. [2021-11-25 20:23:15,179 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 689 transitions. Word has length 45 [2021-11-25 20:23:15,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:23:15,179 INFO L470 AbstractCegarLoop]: Abstraction has 430 states and 689 transitions. [2021-11-25 20:23:15,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.272727272727273) internal successors, (36), 12 states have internal predecessors, (36), 7 states have call successors, (9), 3 states have call predecessors, (9), 5 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-25 20:23:15,180 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 689 transitions. [2021-11-25 20:23:15,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 20:23:15,182 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:23:15,182 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:23:15,222 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Forceful destruction successful, exit code 0 [2021-11-25 20:23:15,405 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (70)] Forceful destruction successful, exit code 0 [2021-11-25 20:23:15,596 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:23:15,596 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting maxErr0REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:23:15,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:23:15,596 INFO L85 PathProgramCache]: Analyzing trace with hash -1293875203, now seen corresponding path program 3 times [2021-11-25 20:23:15,597 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:23:15,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [964265025] [2021-11-25 20:23:15,597 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:23:15,597 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:23:15,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:23:15,598 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:23:15,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (73)] Waiting until timeout for monitored process [2021-11-25 20:23:15,982 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:23:15,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:23:15,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-25 20:23:15,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:23:16,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:23:16,230 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-25 20:23:16,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 26 [2021-11-25 20:23:16,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2021-11-25 20:23:16,615 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 14 proven. 22 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 20:23:16,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:23:17,653 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 8 proven. 28 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 20:23:17,653 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:23:17,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [964265025] [2021-11-25 20:23:17,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [964265025] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:23:17,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1705103442] [2021-11-25 20:23:17,654 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:23:17,654 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:23:17,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:23:17,655 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:23:17,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (74)] Waiting until timeout for monitored process [2021-11-25 20:23:18,217 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:23:18,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:23:18,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-25 20:23:18,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:23:18,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:23:18,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:18,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 27 [2021-11-25 20:23:19,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 16 [2021-11-25 20:23:19,144 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:23:19,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:23:20,294 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 8 proven. 28 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 20:23:20,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1705103442] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:23:20,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1840423940] [2021-11-25 20:23:20,295 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:23:20,295 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:23:20,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:23:20,296 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:23:20,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2021-11-25 20:23:20,659 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:23:20,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:23:20,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 20:23:20,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:23:20,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:23:20,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:20,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 26 [2021-11-25 20:23:20,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 16 [2021-11-25 20:23:21,000 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 18 proven. 20 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:23:21,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:23:21,885 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 20 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:23:21,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1840423940] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:23:21,886 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:23:21,886 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 16, 15, 16, 15] total 25 [2021-11-25 20:23:21,886 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866088554] [2021-11-25 20:23:21,886 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:23:21,887 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 20:23:21,887 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:23:21,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 20:23:21,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=588, Unknown=0, NotChecked=0, Total=650 [2021-11-25 20:23:21,888 INFO L87 Difference]: Start difference. First operand 430 states and 689 transitions. Second operand has 26 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 19 states have internal predecessors, (51), 8 states have call successors, (13), 8 states have call predecessors, (13), 8 states have return successors, (12), 8 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-25 20:23:24,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:23:24,784 INFO L93 Difference]: Finished difference Result 455 states and 718 transitions. [2021-11-25 20:23:24,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 20:23:24,785 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 19 states have internal predecessors, (51), 8 states have call successors, (13), 8 states have call predecessors, (13), 8 states have return successors, (12), 8 states have call predecessors, (12), 5 states have call successors, (12) Word has length 45 [2021-11-25 20:23:24,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:23:24,789 INFO L225 Difference]: With dead ends: 455 [2021-11-25 20:23:24,789 INFO L226 Difference]: Without dead ends: 455 [2021-11-25 20:23:24,790 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 202 SyntacticMatches, 41 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=135, Invalid=1125, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 20:23:24,790 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 90 mSDsluCounter, 1099 mSDsCounter, 0 mSdLazyCounter, 1292 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 1204 SdHoareTripleChecker+Invalid, 1423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 1292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 103 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:23:24,791 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 1204 Invalid, 1423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 1292 Invalid, 0 Unknown, 103 Unchecked, 2.5s Time] [2021-11-25 20:23:24,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2021-11-25 20:23:24,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 444. [2021-11-25 20:23:24,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 444 states, 309 states have (on average 1.1812297734627832) internal successors, (365), 336 states have internal predecessors, (365), 63 states have call successors, (63), 28 states have call predecessors, (63), 56 states have return successors, (283), 79 states have call predecessors, (283), 63 states have call successors, (283) [2021-11-25 20:23:24,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 711 transitions. [2021-11-25 20:23:24,829 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 711 transitions. Word has length 45 [2021-11-25 20:23:24,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:23:24,829 INFO L470 AbstractCegarLoop]: Abstraction has 444 states and 711 transitions. [2021-11-25 20:23:24,829 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 19 states have internal predecessors, (51), 8 states have call successors, (13), 8 states have call predecessors, (13), 8 states have return successors, (12), 8 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-25 20:23:24,830 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 711 transitions. [2021-11-25 20:23:24,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 20:23:24,832 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:23:24,832 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:23:24,849 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (73)] Forceful destruction successful, exit code 0 [2021-11-25 20:23:25,069 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Forceful destruction successful, exit code 0 [2021-11-25 20:23:25,250 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (74)] Forceful destruction successful, exit code 0 [2021-11-25 20:23:25,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt [2021-11-25 20:23:25,446 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting maxErr1REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:23:25,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:23:25,446 INFO L85 PathProgramCache]: Analyzing trace with hash -1293875202, now seen corresponding path program 1 times [2021-11-25 20:23:25,446 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:23:25,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [431069599] [2021-11-25 20:23:25,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:23:25,447 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:23:25,447 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:23:25,452 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:23:25,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (76)] Waiting until timeout for monitored process [2021-11-25 20:23:25,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:25,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-25 20:23:25,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:23:25,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:23:26,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:23:26,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:23:26,169 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-25 20:23:26,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 20:23:26,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:26,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:23:26,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 9 [2021-11-25 20:23:26,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2021-11-25 20:23:26,733 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:23:26,734 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:23:35,658 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:23:35,658 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:23:35,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [431069599] [2021-11-25 20:23:35,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [431069599] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:23:35,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1931667723] [2021-11-25 20:23:35,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:23:35,659 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:23:35,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:23:35,659 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:23:35,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (77)] Waiting until timeout for monitored process [2021-11-25 20:23:36,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:36,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-25 20:23:36,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:23:36,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:23:36,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:23:36,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:23:36,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:36,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:23:36,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:36,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 20:23:37,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2021-11-25 20:23:37,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 20:23:37,654 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:23:37,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:23:46,788 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:23:46,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1931667723] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:23:46,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [340109620] [2021-11-25 20:23:46,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:23:46,789 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:23:46,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:23:46,790 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:23:46,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2021-11-25 20:23:47,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:23:47,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-25 20:23:47,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:23:47,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:23:47,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:23:47,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:23:47,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:47,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-11-25 20:23:47,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:23:47,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:23:47,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2021-11-25 20:23:47,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-25 20:23:47,636 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:23:47,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:23:56,540 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:23:56,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [340109620] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:23:56,541 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 20:23:56,541 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 16, 15, 16, 15] total 37 [2021-11-25 20:23:56,541 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618055349] [2021-11-25 20:23:56,541 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 20:23:56,542 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-25 20:23:56,542 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:23:56,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-25 20:23:56,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1299, Unknown=1, NotChecked=0, Total=1406 [2021-11-25 20:23:56,543 INFO L87 Difference]: Start difference. First operand 444 states and 711 transitions. Second operand has 38 states, 32 states have (on average 2.21875) internal successors, (71), 27 states have internal predecessors, (71), 12 states have call successors, (15), 10 states have call predecessors, (15), 9 states have return successors, (13), 11 states have call predecessors, (13), 7 states have call successors, (13) [2021-11-25 20:24:10,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:24:10,459 INFO L93 Difference]: Finished difference Result 491 states and 765 transitions. [2021-11-25 20:24:10,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-25 20:24:10,461 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 32 states have (on average 2.21875) internal successors, (71), 27 states have internal predecessors, (71), 12 states have call successors, (15), 10 states have call predecessors, (15), 9 states have return successors, (13), 11 states have call predecessors, (13), 7 states have call successors, (13) Word has length 45 [2021-11-25 20:24:10,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:24:10,465 INFO L225 Difference]: With dead ends: 491 [2021-11-25 20:24:10,465 INFO L226 Difference]: Without dead ends: 491 [2021-11-25 20:24:10,466 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 217 SyntacticMatches, 11 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1005 ImplicationChecksByTransitivity, 27.8s TimeCoverageRelationStatistics Valid=359, Invalid=3800, Unknown=1, NotChecked=0, Total=4160 [2021-11-25 20:24:10,467 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 214 mSDsluCounter, 438 mSDsCounter, 0 mSdLazyCounter, 2594 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 532 SdHoareTripleChecker+Invalid, 2866 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 2594 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 185 IncrementalHoareTripleChecker+Unchecked, 8.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:24:10,467 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [216 Valid, 532 Invalid, 2866 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 2594 Invalid, 0 Unknown, 185 Unchecked, 8.9s Time] [2021-11-25 20:24:10,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 491 states. [2021-11-25 20:24:10,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 491 to 478. [2021-11-25 20:24:10,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 335 states have (on average 1.1791044776119404) internal successors, (395), 362 states have internal predecessors, (395), 68 states have call successors, (68), 30 states have call predecessors, (68), 59 states have return successors, (292), 85 states have call predecessors, (292), 68 states have call successors, (292) [2021-11-25 20:24:10,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 755 transitions. [2021-11-25 20:24:10,498 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 755 transitions. Word has length 45 [2021-11-25 20:24:10,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:24:10,498 INFO L470 AbstractCegarLoop]: Abstraction has 478 states and 755 transitions. [2021-11-25 20:24:10,499 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 32 states have (on average 2.21875) internal successors, (71), 27 states have internal predecessors, (71), 12 states have call successors, (15), 10 states have call predecessors, (15), 9 states have return successors, (13), 11 states have call predecessors, (13), 7 states have call successors, (13) [2021-11-25 20:24:10,499 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 755 transitions. [2021-11-25 20:24:10,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-25 20:24:10,501 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:24:10,501 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1] [2021-11-25 20:24:10,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Forceful destruction successful, exit code 0 [2021-11-25 20:24:10,723 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (77)] Forceful destruction successful, exit code 0 [2021-11-25 20:24:10,927 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (76)] Forceful destruction successful, exit code 0 [2021-11-25 20:24:11,118 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:24:11,118 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting nondet_treeErr5REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:24:11,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:24:11,119 INFO L85 PathProgramCache]: Analyzing trace with hash 439899498, now seen corresponding path program 6 times [2021-11-25 20:24:11,119 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:24:11,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [364197333] [2021-11-25 20:24:11,119 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-25 20:24:11,119 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:24:11,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:24:11,120 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:24:11,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (79)] Waiting until timeout for monitored process [2021-11-25 20:24:11,811 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-11-25 20:24:11,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:24:11,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 20:24:11,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:24:11,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:24:11,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:24:16,324 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:24:16,362 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-11-25 20:24:16,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2021-11-25 20:24:16,380 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:24:16,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 20 [2021-11-25 20:24:16,497 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 63 proven. 45 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-25 20:24:16,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:24:19,389 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:24:19,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [364197333] [2021-11-25 20:24:19,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [364197333] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:24:19,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [919108633] [2021-11-25 20:24:19,389 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-25 20:24:19,390 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:24:19,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:24:19,390 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:24:19,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (80)] Waiting until timeout for monitored process [2021-11-25 20:24:20,041 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:24:20,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1843416578] [2021-11-25 20:24:20,042 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-25 20:24:20,042 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:24:20,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:24:20,043 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:24:20,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-25 20:24:20,057 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (80)] Forceful destruction successful, exit code 1 [2021-11-25 20:24:23,645 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-11-25 20:24:23,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:24:23,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 20:24:23,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:24:23,678 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:24:30,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:24:30,074 INFO L354 Elim1Store]: treesize reduction 24, result has 38.5 percent of original size [2021-11-25 20:24:30,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 23 [2021-11-25 20:24:30,092 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-25 20:24:30,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 20 [2021-11-25 20:24:30,152 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 63 proven. 45 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-25 20:24:30,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:24:36,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1843416578] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:24:36,032 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:24:36,032 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2021-11-25 20:24:36,032 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781365037] [2021-11-25 20:24:36,032 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:24:36,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 20:24:36,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:24:36,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 20:24:36,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=141, Unknown=4, NotChecked=0, Total=182 [2021-11-25 20:24:36,033 INFO L87 Difference]: Start difference. First operand 478 states and 755 transitions. Second operand has 9 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-25 20:24:42,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:24:42,556 INFO L93 Difference]: Finished difference Result 540 states and 878 transitions. [2021-11-25 20:24:42,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:24:42,557 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2021-11-25 20:24:42,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:24:42,562 INFO L225 Difference]: With dead ends: 540 [2021-11-25 20:24:42,562 INFO L226 Difference]: Without dead ends: 540 [2021-11-25 20:24:42,563 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 116 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 24.3s TimeCoverageRelationStatistics Valid=62, Invalid=203, Unknown=7, NotChecked=0, Total=272 [2021-11-25 20:24:42,563 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 45 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 241 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:24:42,564 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 172 Invalid, 416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 165 Invalid, 0 Unknown, 241 Unchecked, 0.3s Time] [2021-11-25 20:24:42,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 540 states. [2021-11-25 20:24:42,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 540 to 539. [2021-11-25 20:24:42,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 539 states, 377 states have (on average 1.16710875331565) internal successors, (440), 410 states have internal predecessors, (440), 79 states have call successors, (79), 33 states have call predecessors, (79), 67 states have return successors, (358), 95 states have call predecessors, (358), 79 states have call successors, (358) [2021-11-25 20:24:42,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 539 states to 539 states and 877 transitions. [2021-11-25 20:24:42,614 INFO L78 Accepts]: Start accepts. Automaton has 539 states and 877 transitions. Word has length 59 [2021-11-25 20:24:42,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:24:42,614 INFO L470 AbstractCegarLoop]: Abstraction has 539 states and 877 transitions. [2021-11-25 20:24:42,615 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 5 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-25 20:24:42,615 INFO L276 IsEmpty]: Start isEmpty. Operand 539 states and 877 transitions. [2021-11-25 20:24:42,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-25 20:24:42,617 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:24:42,618 INFO L514 BasicCegarLoop]: trace histogram [10, 6, 6, 6, 6, 6, 6, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1] [2021-11-25 20:24:42,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Forceful destruction successful, exit code 0 [2021-11-25 20:24:42,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (79)] Forceful destruction successful, exit code 0 [2021-11-25 20:24:43,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 20:24:43,045 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting nondet_treeErr2REQUIRES_VIOLATION === [maxErr0REQUIRES_VIOLATION, maxErr1REQUIRES_VIOLATION, maxErr2REQUIRES_VIOLATION, maxErr3REQUIRES_VIOLATION, maxErr4REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 20:24:43,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:24:43,046 INFO L85 PathProgramCache]: Analyzing trace with hash -1225809188, now seen corresponding path program 4 times [2021-11-25 20:24:43,046 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 20:24:43,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1571041998] [2021-11-25 20:24:43,046 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:24:43,046 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 20:24:43,046 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 20:24:43,047 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 20:24:43,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (82)] Waiting until timeout for monitored process [2021-11-25 20:24:43,703 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:24:43,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:24:43,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 20:24:43,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:24:43,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:24:59,344 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:24:59,428 INFO L354 Elim1Store]: treesize reduction 67, result has 37.4 percent of original size [2021-11-25 20:24:59,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 5 case distinctions, treesize of input 29 treesize of output 57 [2021-11-25 20:24:59,782 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 127 proven. 63 refuted. 3 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 20:24:59,782 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:25:01,494 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 20:25:01,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1571041998] [2021-11-25 20:25:01,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1571041998] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:25:01,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [791604970] [2021-11-25 20:25:01,494 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:25:01,494 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 20:25:01,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 20:25:01,495 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 20:25:01,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (83)] Waiting until timeout for monitored process [2021-11-25 20:25:02,360 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:25:02,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:25:02,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 20:25:02,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:25:02,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:25:35,114 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:35,241 INFO L354 Elim1Store]: treesize reduction 60, result has 43.9 percent of original size [2021-11-25 20:25:35,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 5 case distinctions, treesize of input 54 treesize of output 89 [2021-11-25 20:25:37,187 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 127 proven. 63 refuted. 3 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 20:25:37,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:25:37,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [791604970] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:25:37,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [877462253] [2021-11-25 20:25:37,555 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:25:37,556 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:25:37,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:25:37,557 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:25:37,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2efd08d-9589-4969-9d5b-8b58c1df6348/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-25 20:25:38,037 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:25:38,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:25:38,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 20:25:38,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:25:58,502 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:25:58,598 INFO L354 Elim1Store]: treesize reduction 96, result has 27.8 percent of original size [2021-11-25 20:25:58,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 8 case distinctions, treesize of input 54 treesize of output 77 [2021-11-25 20:26:00,159 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 128 proven. 61 refuted. 2 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-25 20:26:00,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:26:02,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [877462253] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:26:02,813 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:26:02,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 11] total 16 [2021-11-25 20:26:02,814 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386831870] [2021-11-25 20:26:02,814 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:26:02,814 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 20:26:02,814 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 20:26:02,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 20:26:02,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=256, Unknown=18, NotChecked=0, Total=342 [2021-11-25 20:26:02,815 INFO L87 Difference]: Start difference. First operand 539 states and 877 transitions. Second operand has 17 states, 16 states have (on average 3.875) internal successors, (62), 14 states have internal predecessors, (62), 11 states have call successors, (14), 2 states have call predecessors, (14), 8 states have return successors, (17), 11 states have call predecessors, (17), 11 states have call successors, (17)