./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/diff-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/diff-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 5cc33a4b6801f9f06dbbb17ff694aba4439c76c6a2b62ec290c2132cc01ea0fe --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 01:50:10,872 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 01:50:10,874 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 01:50:10,931 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 01:50:10,931 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 01:50:10,933 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 01:50:10,935 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 01:50:10,938 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 01:50:10,940 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 01:50:10,941 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 01:50:10,943 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 01:50:10,944 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 01:50:10,945 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 01:50:10,946 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 01:50:10,948 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 01:50:10,949 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 01:50:10,951 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 01:50:10,952 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 01:50:10,954 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 01:50:10,957 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 01:50:10,960 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 01:50:10,961 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 01:50:10,963 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 01:50:10,964 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 01:50:10,968 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 01:50:10,969 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 01:50:10,970 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 01:50:10,971 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 01:50:10,971 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 01:50:10,973 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 01:50:10,973 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 01:50:10,974 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 01:50:10,975 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 01:50:10,976 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 01:50:10,978 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 01:50:10,978 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 01:50:10,979 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 01:50:10,980 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 01:50:10,980 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 01:50:10,981 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 01:50:10,982 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 01:50:10,983 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-23 01:50:11,010 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 01:50:11,011 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 01:50:11,011 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 01:50:11,012 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 01:50:11,012 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 01:50:11,013 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 01:50:11,013 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 01:50:11,014 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 01:50:11,014 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 01:50:11,014 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 01:50:11,015 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 01:50:11,015 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 01:50:11,016 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 01:50:11,016 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 01:50:11,016 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 01:50:11,017 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 01:50:11,017 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 01:50:11,018 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 01:50:11,019 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-23 01:50:11,019 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-23 01:50:11,020 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 01:50:11,020 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 01:50:11,020 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-23 01:50:11,021 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 01:50:11,021 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 01:50:11,021 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 01:50:11,022 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-23 01:50:11,022 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-23 01:50:11,023 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-23 01:50:11,023 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 01:50:11,023 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 01:50:11,024 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 01:50:11,024 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 01:50:11,025 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 01:50:11,025 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 01:50:11,025 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 01:50:11,026 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 01:50:11,026 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 01:50:11,027 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 01:50:11,027 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 01:50:11,028 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 01:50:11,028 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 01:50:11,028 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_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5cc33a4b6801f9f06dbbb17ff694aba4439c76c6a2b62ec290c2132cc01ea0fe [2021-11-23 01:50:11,298 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 01:50:11,328 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 01:50:11,331 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 01:50:11,332 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 01:50:11,333 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 01:50:11,334 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/array-memsafety/diff-alloca-2.i [2021-11-23 01:50:11,408 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/data/4efb2fccf/07786b28a88d4baca4e5b92460bd87bd/FLAGab083ad3d [2021-11-23 01:50:11,966 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 01:50:11,967 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/sv-benchmarks/c/array-memsafety/diff-alloca-2.i [2021-11-23 01:50:11,980 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/data/4efb2fccf/07786b28a88d4baca4e5b92460bd87bd/FLAGab083ad3d [2021-11-23 01:50:12,297 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/data/4efb2fccf/07786b28a88d4baca4e5b92460bd87bd [2021-11-23 01:50:12,300 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 01:50:12,302 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 01:50:12,303 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 01:50:12,304 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 01:50:12,307 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 01:50:12,308 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:50:12" (1/1) ... [2021-11-23 01:50:12,309 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28ee714e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:50:12, skipping insertion in model container [2021-11-23 01:50:12,309 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:50:12" (1/1) ... [2021-11-23 01:50:12,316 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 01:50:12,355 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 01:50:12,651 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 01:50:12,660 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) [2021-11-23 01:50:12,661 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@2d0bc291 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:50:12, skipping insertion in model container [2021-11-23 01:50:12,661 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 01:50:12,661 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-23 01:50:12,664 INFO L158 Benchmark]: Toolchain (without parser) took 360.72ms. Allocated memory was 88.1MB in the beginning and 109.1MB in the end (delta: 21.0MB). Free memory was 54.0MB in the beginning and 84.3MB in the end (delta: -30.3MB). Peak memory consumption was 7.8MB. Max. memory is 16.1GB. [2021-11-23 01:50:12,664 INFO L158 Benchmark]: CDTParser took 0.27ms. Allocated memory is still 88.1MB. Free memory is still 43.9MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 01:50:12,665 INFO L158 Benchmark]: CACSL2BoogieTranslator took 357.97ms. Allocated memory was 88.1MB in the beginning and 109.1MB in the end (delta: 21.0MB). Free memory was 53.7MB in the beginning and 84.3MB in the end (delta: -30.6MB). Peak memory consumption was 7.8MB. Max. memory is 16.1GB. [2021-11-23 01:50:12,667 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27ms. Allocated memory is still 88.1MB. Free memory is still 43.9MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 357.97ms. Allocated memory was 88.1MB in the beginning and 109.1MB in the end (delta: 21.0MB). Free memory was 53.7MB in the beginning and 84.3MB in the end (delta: -30.6MB). Peak memory consumption was 7.8MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 545]: 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_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/diff-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 5cc33a4b6801f9f06dbbb17ff694aba4439c76c6a2b62ec290c2132cc01ea0fe --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 01:50:14,970 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 01:50:14,974 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 01:50:15,028 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 01:50:15,029 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 01:50:15,033 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 01:50:15,035 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 01:50:15,040 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 01:50:15,043 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 01:50:15,052 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 01:50:15,053 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 01:50:15,055 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 01:50:15,056 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 01:50:15,058 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 01:50:15,060 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 01:50:15,065 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 01:50:15,067 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 01:50:15,068 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 01:50:15,070 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 01:50:15,077 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 01:50:15,079 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 01:50:15,081 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 01:50:15,084 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 01:50:15,085 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 01:50:15,094 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 01:50:15,095 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 01:50:15,095 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 01:50:15,097 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 01:50:15,098 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 01:50:15,099 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 01:50:15,100 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 01:50:15,100 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 01:50:15,102 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 01:50:15,103 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 01:50:15,105 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 01:50:15,105 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 01:50:15,106 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 01:50:15,106 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 01:50:15,106 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 01:50:15,108 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 01:50:15,109 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 01:50:15,109 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2021-11-23 01:50:15,152 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 01:50:15,152 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 01:50:15,153 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 01:50:15,153 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 01:50:15,154 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 01:50:15,154 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 01:50:15,154 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 01:50:15,155 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 01:50:15,155 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 01:50:15,155 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 01:50:15,156 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 01:50:15,157 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 01:50:15,158 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-23 01:50:15,158 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-23 01:50:15,159 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 01:50:15,159 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 01:50:15,159 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-23 01:50:15,159 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 01:50:15,159 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 01:50:15,160 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 01:50:15,160 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-23 01:50:15,160 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-23 01:50:15,160 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-23 01:50:15,161 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 01:50:15,161 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 01:50:15,161 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 01:50:15,161 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 01:50:15,161 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 01:50:15,162 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 01:50:15,162 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 01:50:15,162 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 01:50:15,163 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 01:50:15,163 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 01:50:15,163 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 01:50:15,164 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 01:50:15,164 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 01:50:15,164 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 01:50:15,164 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 01:50:15,165 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 01:50:15,165 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_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5cc33a4b6801f9f06dbbb17ff694aba4439c76c6a2b62ec290c2132cc01ea0fe [2021-11-23 01:50:15,566 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 01:50:15,596 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 01:50:15,599 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 01:50:15,601 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 01:50:15,601 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 01:50:15,603 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/array-memsafety/diff-alloca-2.i [2021-11-23 01:50:15,680 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/data/6e25a4853/6488f80237694084a21aa4b50d039173/FLAG44f9a146a [2021-11-23 01:50:16,292 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 01:50:16,296 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/sv-benchmarks/c/array-memsafety/diff-alloca-2.i [2021-11-23 01:50:16,316 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/data/6e25a4853/6488f80237694084a21aa4b50d039173/FLAG44f9a146a [2021-11-23 01:50:16,574 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/data/6e25a4853/6488f80237694084a21aa4b50d039173 [2021-11-23 01:50:16,578 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 01:50:16,580 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 01:50:16,583 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 01:50:16,583 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 01:50:16,588 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 01:50:16,589 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:50:16" (1/1) ... [2021-11-23 01:50:16,591 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6334774b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:50:16, skipping insertion in model container [2021-11-23 01:50:16,591 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:50:16" (1/1) ... [2021-11-23 01:50:16,598 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 01:50:16,654 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 01:50:17,062 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 01:50:17,081 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-23 01:50:17,095 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 01:50:17,161 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 01:50:17,169 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 01:50:17,236 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 01:50:17,274 INFO L208 MainTranslator]: Completed translation [2021-11-23 01:50:17,275 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:50:17 WrapperNode [2021-11-23 01:50:17,275 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 01:50:17,276 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 01:50:17,277 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 01:50:17,277 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 01:50:17,284 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:50:17" (1/1) ... [2021-11-23 01:50:17,317 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:50:17" (1/1) ... [2021-11-23 01:50:17,352 INFO L137 Inliner]: procedures = 117, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 96 [2021-11-23 01:50:17,353 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 01:50:17,354 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 01:50:17,354 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 01:50:17,354 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 01:50:17,363 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:50:17" (1/1) ... [2021-11-23 01:50:17,363 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:50:17" (1/1) ... [2021-11-23 01:50:17,377 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:50:17" (1/1) ... [2021-11-23 01:50:17,377 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:50:17" (1/1) ... [2021-11-23 01:50:17,385 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:50:17" (1/1) ... [2021-11-23 01:50:17,400 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:50:17" (1/1) ... [2021-11-23 01:50:17,406 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:50:17" (1/1) ... [2021-11-23 01:50:17,409 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 01:50:17,410 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 01:50:17,410 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 01:50:17,411 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 01:50:17,411 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:50:17" (1/1) ... [2021-11-23 01:50:17,427 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 01:50:17,439 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:50:17,453 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 01:50:17,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 01:50:17,506 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-23 01:50:17,507 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 01:50:17,508 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 01:50:17,508 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-23 01:50:17,509 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 01:50:17,509 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 01:50:17,650 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 01:50:17,651 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 01:50:18,067 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 01:50:18,073 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 01:50:18,074 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-23 01:50:18,076 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:50:18 BoogieIcfgContainer [2021-11-23 01:50:18,076 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 01:50:18,078 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 01:50:18,078 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 01:50:18,081 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 01:50:18,081 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 01:50:16" (1/3) ... [2021-11-23 01:50:18,082 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bc8446b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:50:18, skipping insertion in model container [2021-11-23 01:50:18,082 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:50:17" (2/3) ... [2021-11-23 01:50:18,083 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bc8446b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:50:18, skipping insertion in model container [2021-11-23 01:50:18,083 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:50:18" (3/3) ... [2021-11-23 01:50:18,084 INFO L111 eAbstractionObserver]: Analyzing ICFG diff-alloca-2.i [2021-11-23 01:50:18,090 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 01:50:18,090 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 13 error locations. [2021-11-23 01:50:18,133 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 01:50:18,140 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 [2021-11-23 01:50:18,140 INFO L340 AbstractCegarLoop]: Starting to check reachability of 13 error locations. [2021-11-23 01:50:18,154 INFO L276 IsEmpty]: Start isEmpty. Operand has 42 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 41 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:18,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 01:50:18,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:50:18,161 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:50:18,161 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:50:18,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:50:18,167 INFO L85 PathProgramCache]: Analyzing trace with hash 1805029096, now seen corresponding path program 1 times [2021-11-23 01:50:18,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:50:18,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1571261936] [2021-11-23 01:50:18,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:18,179 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:50:18,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:50:18,180 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:50:18,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 01:50:18,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:18,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 01:50:18,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:18,504 INFO L354 Elim1Store]: treesize reduction 39, result has 29.1 percent of original size [2021-11-23 01:50:18,505 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 3 case distinctions, treesize of input 23 treesize of output 29 [2021-11-23 01:50:18,640 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:18,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:18,684 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:18,684 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:50:18,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1571261936] [2021-11-23 01:50:18,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1571261936] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 01:50:18,686 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:50:18,686 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 3 [2021-11-23 01:50:18,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119277567] [2021-11-23 01:50:18,688 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 01:50:18,692 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 01:50:18,692 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:50:18,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 01:50:18,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 01:50:18,731 INFO L87 Difference]: Start difference. First operand has 42 states, 28 states have (on average 1.8928571428571428) internal successors, (53), 41 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:18,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:50:18,831 INFO L93 Difference]: Finished difference Result 49 states and 60 transitions. [2021-11-23 01:50:18,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 01:50:18,834 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-23 01:50:18,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:50:18,841 INFO L225 Difference]: With dead ends: 49 [2021-11-23 01:50:18,841 INFO L226 Difference]: Without dead ends: 47 [2021-11-23 01:50:18,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 01:50:18,848 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 10 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 5 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:50:18,849 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 73 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 5 Unchecked, 0.1s Time] [2021-11-23 01:50:18,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-23 01:50:18,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 42. [2021-11-23 01:50:18,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 29 states have (on average 1.7586206896551724) internal successors, (51), 41 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:18,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 51 transitions. [2021-11-23 01:50:18,890 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 51 transitions. Word has length 7 [2021-11-23 01:50:18,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:50:18,891 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 51 transitions. [2021-11-23 01:50:18,891 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:18,891 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 51 transitions. [2021-11-23 01:50:18,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 01:50:18,892 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:50:18,892 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:50:18,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:19,092 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:50:19,093 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:50:19,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:50:19,094 INFO L85 PathProgramCache]: Analyzing trace with hash 1805029097, now seen corresponding path program 1 times [2021-11-23 01:50:19,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:50:19,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1383098967] [2021-11-23 01:50:19,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:19,095 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:50:19,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:50:19,096 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:50:19,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 01:50:19,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:19,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 01:50:19,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:19,297 INFO L354 Elim1Store]: treesize reduction 42, result has 28.8 percent of original size [2021-11-23 01:50:19,298 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 2 case distinctions, treesize of input 24 treesize of output 31 [2021-11-23 01:50:19,304 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 32 treesize of output 30 [2021-11-23 01:50:19,854 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:19,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:20,054 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 61 treesize of output 59 [2021-11-23 01:50:20,116 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:20,117 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:50:20,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1383098967] [2021-11-23 01:50:20,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1383098967] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 01:50:20,118 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:50:20,118 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-11-23 01:50:20,122 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791531971] [2021-11-23 01:50:20,122 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 01:50:20,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 01:50:20,124 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:50:20,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 01:50:20,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 01:50:20,126 INFO L87 Difference]: Start difference. First operand 42 states and 51 transitions. Second operand has 6 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:20,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:50:20,609 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2021-11-23 01:50:20,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 01:50:20,612 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-23 01:50:20,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:50:20,613 INFO L225 Difference]: With dead ends: 46 [2021-11-23 01:50:20,613 INFO L226 Difference]: Without dead ends: 46 [2021-11-23 01:50:20,613 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 01:50:20,615 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 6 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 4 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 01:50:20,615 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 110 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 4 Unchecked, 0.3s Time] [2021-11-23 01:50:20,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-23 01:50:20,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2021-11-23 01:50:20,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 29 states have (on average 1.7241379310344827) internal successors, (50), 41 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:20,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2021-11-23 01:50:20,625 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 7 [2021-11-23 01:50:20,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:50:20,625 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2021-11-23 01:50:20,625 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:20,626 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2021-11-23 01:50:20,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 01:50:20,627 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:50:20,627 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:50:20,647 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:20,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:50:20,838 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:50:20,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:50:20,839 INFO L85 PathProgramCache]: Analyzing trace with hash -533876908, now seen corresponding path program 1 times [2021-11-23 01:50:20,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:50:20,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1604404711] [2021-11-23 01:50:20,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:20,840 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:50:20,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:50:20,847 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:50:20,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 01:50:20,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:20,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 01:50:20,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:20,943 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:20,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:20,980 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:20,981 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:50:20,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1604404711] [2021-11-23 01:50:20,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1604404711] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 01:50:20,981 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:50:20,982 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-23 01:50:20,982 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036717547] [2021-11-23 01:50:20,982 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 01:50:20,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 01:50:20,983 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:50:20,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 01:50:20,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 01:50:20,983 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:21,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:50:21,102 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2021-11-23 01:50:21,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 01:50:21,103 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-23 01:50:21,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:50:21,105 INFO L225 Difference]: With dead ends: 83 [2021-11-23 01:50:21,106 INFO L226 Difference]: Without dead ends: 83 [2021-11-23 01:50:21,106 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-11-23 01:50:21,110 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 138 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:50:21,111 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 115 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:50:21,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-23 01:50:21,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 42. [2021-11-23 01:50:21,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 29 states have (on average 1.6896551724137931) internal successors, (49), 41 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:21,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2021-11-23 01:50:21,123 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 9 [2021-11-23 01:50:21,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:50:21,124 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2021-11-23 01:50:21,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:21,125 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2021-11-23 01:50:21,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 01:50:21,126 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:50:21,127 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:50:21,141 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:21,337 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:50:21,337 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:50:21,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:50:21,338 INFO L85 PathProgramCache]: Analyzing trace with hash -1906083541, now seen corresponding path program 1 times [2021-11-23 01:50:21,339 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:50:21,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1264102389] [2021-11-23 01:50:21,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:21,339 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:50:21,339 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:50:21,340 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:50:21,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 01:50:21,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:21,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 01:50:21,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:21,501 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:21,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:21,571 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:21,571 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:50:21,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1264102389] [2021-11-23 01:50:21,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1264102389] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:50:21,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1135351642] [2021-11-23 01:50:21,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:21,572 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:50:21,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:50:21,574 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:50:21,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (6)] Waiting until timeout for monitored process [2021-11-23 01:50:21,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:21,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 01:50:21,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:21,736 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:21,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:21,770 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:21,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1135351642] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 01:50:21,771 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 01:50:21,772 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5] total 9 [2021-11-23 01:50:21,772 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348294476] [2021-11-23 01:50:21,773 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 01:50:21,774 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 01:50:21,774 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:50:21,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 01:50:21,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-23 01:50:21,776 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:21,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:50:21,886 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2021-11-23 01:50:21,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 01:50:21,887 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-23 01:50:21,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:50:21,888 INFO L225 Difference]: With dead ends: 41 [2021-11-23 01:50:21,888 INFO L226 Difference]: Without dead ends: 41 [2021-11-23 01:50:21,888 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-23 01:50:21,890 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 33 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:50:21,890 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 36 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:50:21,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-23 01:50:21,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-23 01:50:21,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 40 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:21,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2021-11-23 01:50:21,895 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 11 [2021-11-23 01:50:21,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:50:21,895 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2021-11-23 01:50:21,898 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:21,899 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2021-11-23 01:50:21,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 01:50:21,899 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:50:21,899 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:50:21,916 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:22,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (6)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:22,310 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 01:50:22,311 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:50:22,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:50:22,311 INFO L85 PathProgramCache]: Analyzing trace with hash -1906083540, now seen corresponding path program 1 times [2021-11-23 01:50:22,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:50:22,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [365197219] [2021-11-23 01:50:22,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:22,312 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:50:22,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:50:22,313 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:50:22,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 01:50:22,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:22,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 01:50:22,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:22,454 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:22,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:22,516 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:22,516 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:50:22,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [365197219] [2021-11-23 01:50:22,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [365197219] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:50:22,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [956521949] [2021-11-23 01:50:22,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:22,517 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:50:22,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:50:22,520 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:50:22,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (8)] Waiting until timeout for monitored process [2021-11-23 01:50:22,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:22,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 01:50:22,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:22,672 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:22,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:22,708 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:22,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [956521949] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:50:22,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [54789274] [2021-11-23 01:50:22,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:22,709 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:50:22,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:50:22,711 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:50:22,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 01:50:22,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:22,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 01:50:22,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:22,815 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:22,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:22,853 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:22,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [54789274] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:50:22,853 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:50:22,854 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-23 01:50:22,854 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424438812] [2021-11-23 01:50:22,854 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:50:22,855 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 01:50:22,855 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:50:22,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 01:50:22,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 01:50:22,856 INFO L87 Difference]: Start difference. First operand 41 states and 48 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:22,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:50:22,955 INFO L93 Difference]: Finished difference Result 77 states and 89 transitions. [2021-11-23 01:50:22,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 01:50:22,956 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-23 01:50:22,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:50:22,958 INFO L225 Difference]: With dead ends: 77 [2021-11-23 01:50:22,959 INFO L226 Difference]: Without dead ends: 77 [2021-11-23 01:50:22,959 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 01:50:22,962 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 72 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:50:22,965 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 226 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:50:22,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-23 01:50:22,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 48. [2021-11-23 01:50:22,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 36 states have (on average 1.5555555555555556) internal successors, (56), 47 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:22,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2021-11-23 01:50:22,979 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 11 [2021-11-23 01:50:22,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:50:22,980 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2021-11-23 01:50:22,980 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:22,980 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2021-11-23 01:50:22,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 01:50:22,981 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:50:22,981 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:50:23,019 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:23,202 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (8)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:23,410 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:23,600 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:50:23,600 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:50:23,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:50:23,601 INFO L85 PathProgramCache]: Analyzing trace with hash -1226025170, now seen corresponding path program 1 times [2021-11-23 01:50:23,601 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:50:23,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [790832430] [2021-11-23 01:50:23,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:23,602 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:50:23,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:50:23,608 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:50:23,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 01:50:23,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:23,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 01:50:23,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:23,767 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 01:50:23,767 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 2 case distinctions, treesize of input 30 treesize of output 37 [2021-11-23 01:50:23,775 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 38 treesize of output 36 [2021-11-23 01:50:25,099 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:25,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:25,804 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 114 treesize of output 112 [2021-11-23 01:50:25,906 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:25,906 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:50:25,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [790832430] [2021-11-23 01:50:25,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [790832430] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:50:25,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [385134813] [2021-11-23 01:50:25,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:25,907 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:50:25,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:50:25,912 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:50:25,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-23 01:50:26,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:26,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 01:50:26,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:26,152 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 01:50:26,152 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 2 case distinctions, treesize of input 28 treesize of output 35 [2021-11-23 01:50:26,162 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 36 treesize of output 34 [2021-11-23 01:50:27,125 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:27,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:27,377 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 114 treesize of output 112 [2021-11-23 01:50:27,429 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:27,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [385134813] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:50:27,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [106595247] [2021-11-23 01:50:27,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:27,430 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:50:27,430 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:50:27,431 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:50:27,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 01:50:27,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:27,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 01:50:27,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:27,561 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 01:50:27,561 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 2 case distinctions, treesize of input 29 treesize of output 36 [2021-11-23 01:50:27,566 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 37 treesize of output 35 [2021-11-23 01:50:28,495 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:28,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:28,714 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 63 treesize of output 61 [2021-11-23 01:50:28,784 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:28,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [106595247] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:50:28,784 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:50:28,784 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6, 6, 5, 5] total 14 [2021-11-23 01:50:28,785 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478273493] [2021-11-23 01:50:28,785 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:50:28,785 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-23 01:50:28,785 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:50:28,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-23 01:50:28,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=144, Unknown=0, NotChecked=0, Total=210 [2021-11-23 01:50:28,786 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:28,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:50:28,918 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2021-11-23 01:50:28,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 01:50:28,918 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-23 01:50:28,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:50:28,920 INFO L225 Difference]: With dead ends: 56 [2021-11-23 01:50:28,922 INFO L226 Difference]: Without dead ends: 56 [2021-11-23 01:50:28,923 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=73, Invalid=167, Unknown=0, NotChecked=0, Total=240 [2021-11-23 01:50:28,924 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 9 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 27 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 01:50:28,925 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 222 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1 Invalid, 0 Unknown, 27 Unchecked, 0.0s Time] [2021-11-23 01:50:28,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-23 01:50:28,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-11-23 01:50:28,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 44 states have (on average 1.5) internal successors, (66), 55 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:28,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 66 transitions. [2021-11-23 01:50:28,931 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 66 transitions. Word has length 11 [2021-11-23 01:50:28,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:50:28,932 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 66 transitions. [2021-11-23 01:50:28,932 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:28,932 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 66 transitions. [2021-11-23 01:50:28,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 01:50:28,933 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:50:28,933 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:50:28,939 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:29,157 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:29,342 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:29,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:50:29,535 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:50:29,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:50:29,536 INFO L85 PathProgramCache]: Analyzing trace with hash -2090265385, now seen corresponding path program 1 times [2021-11-23 01:50:29,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:50:29,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1760989678] [2021-11-23 01:50:29,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:29,536 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:50:29,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:50:29,538 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:50:29,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 01:50:29,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:29,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 01:50:29,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:29,653 INFO L354 Elim1Store]: treesize reduction 39, result has 29.1 percent of original size [2021-11-23 01:50:29,653 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 30 treesize of output 36 [2021-11-23 01:50:29,969 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:29,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:30,008 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:30,009 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:50:30,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1760989678] [2021-11-23 01:50:30,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1760989678] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 01:50:30,009 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:50:30,009 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 3 [2021-11-23 01:50:30,009 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69221375] [2021-11-23 01:50:30,010 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 01:50:30,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 01:50:30,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:50:30,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 01:50:30,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 01:50:30,011 INFO L87 Difference]: Start difference. First operand 56 states and 66 transitions. Second operand has 4 states, 3 states have (on average 7.333333333333333) internal successors, (22), 4 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:30,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:50:30,065 INFO L93 Difference]: Finished difference Result 59 states and 71 transitions. [2021-11-23 01:50:30,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 01:50:30,066 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 7.333333333333333) internal successors, (22), 4 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-23 01:50:30,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:50:30,067 INFO L225 Difference]: With dead ends: 59 [2021-11-23 01:50:30,067 INFO L226 Difference]: Without dead ends: 59 [2021-11-23 01:50:30,067 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 01:50:30,068 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 4 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 4 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:50:30,068 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 64 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 4 Unchecked, 0.1s Time] [2021-11-23 01:50:30,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-23 01:50:30,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-11-23 01:50:30,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 46 states have (on average 1.5217391304347827) internal successors, (70), 57 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:30,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 70 transitions. [2021-11-23 01:50:30,074 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 70 transitions. Word has length 13 [2021-11-23 01:50:30,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:50:30,074 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 70 transitions. [2021-11-23 01:50:30,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 7.333333333333333) internal successors, (22), 4 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:30,074 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 70 transitions. [2021-11-23 01:50:30,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 01:50:30,075 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:50:30,075 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:50:30,088 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:30,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:50:30,276 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:50:30,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:50:30,276 INFO L85 PathProgramCache]: Analyzing trace with hash -2090265384, now seen corresponding path program 1 times [2021-11-23 01:50:30,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:50:30,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1223726252] [2021-11-23 01:50:30,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:30,277 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:50:30,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:50:30,277 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:50:30,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 01:50:30,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:30,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 01:50:30,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:30,407 INFO L354 Elim1Store]: treesize reduction 44, result has 27.9 percent of original size [2021-11-23 01:50:30,407 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 2 case distinctions, treesize of input 32 treesize of output 39 [2021-11-23 01:50:30,412 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 41 treesize of output 39 [2021-11-23 01:50:34,667 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:34,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:34,921 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 33 treesize of output 31 [2021-11-23 01:50:34,946 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:34,947 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:50:34,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1223726252] [2021-11-23 01:50:34,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1223726252] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 01:50:34,947 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:50:34,947 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2021-11-23 01:50:34,947 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225314436] [2021-11-23 01:50:34,947 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 01:50:34,947 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 01:50:34,948 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:50:34,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 01:50:34,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-23 01:50:34,948 INFO L87 Difference]: Start difference. First operand 58 states and 70 transitions. Second operand has 8 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:35,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:50:35,232 INFO L93 Difference]: Finished difference Result 82 states and 98 transitions. [2021-11-23 01:50:35,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 01:50:35,233 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-23 01:50:35,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:50:35,233 INFO L225 Difference]: With dead ends: 82 [2021-11-23 01:50:35,233 INFO L226 Difference]: Without dead ends: 82 [2021-11-23 01:50:35,234 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-11-23 01:50:35,235 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 7 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 01:50:35,235 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 193 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 21 Unchecked, 0.2s Time] [2021-11-23 01:50:35,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-23 01:50:35,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 58. [2021-11-23 01:50:35,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 46 states have (on average 1.5) internal successors, (69), 57 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:35,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 69 transitions. [2021-11-23 01:50:35,240 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 69 transitions. Word has length 13 [2021-11-23 01:50:35,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:50:35,241 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 69 transitions. [2021-11-23 01:50:35,241 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:35,241 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 69 transitions. [2021-11-23 01:50:35,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 01:50:35,242 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:50:35,242 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:50:35,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:35,443 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:50:35,444 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:50:35,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:50:35,444 INFO L85 PathProgramCache]: Analyzing trace with hash 1633190459, now seen corresponding path program 1 times [2021-11-23 01:50:35,444 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:50:35,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [123959526] [2021-11-23 01:50:35,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:35,445 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:50:35,445 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:50:35,445 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:50:35,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 01:50:35,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:35,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 01:50:35,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:35,550 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:35,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:35,609 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:35,609 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:50:35,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [123959526] [2021-11-23 01:50:35,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [123959526] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 01:50:35,609 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:50:35,610 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-23 01:50:35,610 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398005796] [2021-11-23 01:50:35,610 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 01:50:35,610 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 01:50:35,611 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:50:35,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 01:50:35,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 01:50:35,611 INFO L87 Difference]: Start difference. First operand 58 states and 69 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:35,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:50:35,702 INFO L93 Difference]: Finished difference Result 113 states and 130 transitions. [2021-11-23 01:50:35,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 01:50:35,703 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-23 01:50:35,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:50:35,704 INFO L225 Difference]: With dead ends: 113 [2021-11-23 01:50:35,704 INFO L226 Difference]: Without dead ends: 113 [2021-11-23 01:50:35,704 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-11-23 01:50:35,705 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 83 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:50:35,705 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 113 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:50:35,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-23 01:50:35,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 58. [2021-11-23 01:50:35,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 46 states have (on average 1.4782608695652173) internal successors, (68), 57 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:35,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2021-11-23 01:50:35,711 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 16 [2021-11-23 01:50:35,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:50:35,711 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2021-11-23 01:50:35,712 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:35,712 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2021-11-23 01:50:35,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-23 01:50:35,713 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:50:35,713 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:50:35,726 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:35,923 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:50:35,923 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:50:35,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:50:35,923 INFO L85 PathProgramCache]: Analyzing trace with hash -862198758, now seen corresponding path program 1 times [2021-11-23 01:50:35,924 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:50:35,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [861585663] [2021-11-23 01:50:35,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:35,924 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:50:35,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:50:35,926 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:50:35,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 01:50:35,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:35,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 01:50:35,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:36,043 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:36,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:36,108 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:36,109 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:50:36,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [861585663] [2021-11-23 01:50:36,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [861585663] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:50:36,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1975855499] [2021-11-23 01:50:36,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:36,109 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:50:36,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:50:36,112 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:50:36,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-23 01:50:36,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:36,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 01:50:36,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:36,225 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:36,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:36,244 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:36,244 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1975855499] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 01:50:36,244 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 01:50:36,244 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5] total 9 [2021-11-23 01:50:36,244 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233316942] [2021-11-23 01:50:36,244 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 01:50:36,245 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 01:50:36,245 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:50:36,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 01:50:36,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-23 01:50:36,245 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand has 3 states, 2 states have (on average 8.5) internal successors, (17), 3 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:36,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:50:36,308 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-11-23 01:50:36,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 01:50:36,310 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 8.5) internal successors, (17), 3 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-23 01:50:36,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:50:36,310 INFO L225 Difference]: With dead ends: 57 [2021-11-23 01:50:36,310 INFO L226 Difference]: Without dead ends: 57 [2021-11-23 01:50:36,311 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-23 01:50:36,311 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 32 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:50:36,312 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 36 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:50:36,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-23 01:50:36,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-11-23 01:50:36,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:36,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-11-23 01:50:36,317 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 17 [2021-11-23 01:50:36,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:50:36,317 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-11-23 01:50:36,317 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 8.5) internal successors, (17), 3 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:36,317 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-11-23 01:50:36,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-23 01:50:36,318 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:50:36,318 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:50:36,322 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:36,531 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2021-11-23 01:50:36,722 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:50:36,722 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:50:36,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:50:36,723 INFO L85 PathProgramCache]: Analyzing trace with hash -862198757, now seen corresponding path program 1 times [2021-11-23 01:50:36,724 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:50:36,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [138380734] [2021-11-23 01:50:36,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:36,724 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:50:36,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:50:36,725 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:50:36,768 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 01:50:36,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:36,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 01:50:36,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:36,866 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:36,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:36,932 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:36,933 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:50:36,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [138380734] [2021-11-23 01:50:36,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [138380734] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:50:36,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [989252667] [2021-11-23 01:50:36,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:36,933 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:50:36,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:50:36,934 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:50:36,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-23 01:50:37,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:37,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 01:50:37,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:37,093 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:37,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:37,135 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:37,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [989252667] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:50:37,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [744533117] [2021-11-23 01:50:37,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:37,136 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:50:37,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:50:37,137 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:50:37,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 01:50:37,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:37,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 01:50:37,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:37,251 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:37,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:37,293 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:37,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [744533117] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:50:37,293 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:50:37,294 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-23 01:50:37,294 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073076367] [2021-11-23 01:50:37,294 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:50:37,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 01:50:37,295 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:50:37,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 01:50:37,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 01:50:37,295 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 8 states, 8 states have (on average 3.75) internal successors, (30), 8 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:37,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:50:37,372 INFO L93 Difference]: Finished difference Result 107 states and 123 transitions. [2021-11-23 01:50:37,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 01:50:37,373 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 8 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-23 01:50:37,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:50:37,374 INFO L225 Difference]: With dead ends: 107 [2021-11-23 01:50:37,374 INFO L226 Difference]: Without dead ends: 107 [2021-11-23 01:50:37,374 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 01:50:37,375 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 87 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:50:37,375 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 158 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:50:37,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-23 01:50:37,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 84. [2021-11-23 01:50:37,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 73 states have (on average 1.3424657534246576) internal successors, (98), 83 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:37,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 98 transitions. [2021-11-23 01:50:37,382 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 98 transitions. Word has length 17 [2021-11-23 01:50:37,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:50:37,382 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 98 transitions. [2021-11-23 01:50:37,382 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 8 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:37,382 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 98 transitions. [2021-11-23 01:50:37,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-23 01:50:37,383 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:50:37,384 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:50:37,416 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:37,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:37,804 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (18)] Ended with exit code 0 [2021-11-23 01:50:37,998 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:50:37,998 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:50:37,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:50:37,999 INFO L85 PathProgramCache]: Analyzing trace with hash -1873316007, now seen corresponding path program 1 times [2021-11-23 01:50:37,999 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:50:37,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [15910492] [2021-11-23 01:50:37,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:37,999 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:50:37,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:50:38,000 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:50:38,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 01:50:38,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:38,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 01:50:38,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:38,137 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 01:50:38,137 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 2 case distinctions, treesize of input 31 treesize of output 38 [2021-11-23 01:50:38,141 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 40 treesize of output 38 [2021-11-23 01:50:44,391 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:44,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:45,013 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 34 treesize of output 32 [2021-11-23 01:50:45,074 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:45,075 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:50:45,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [15910492] [2021-11-23 01:50:45,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [15910492] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:50:45,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1970766961] [2021-11-23 01:50:45,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:45,075 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:50:45,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:50:45,076 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:50:45,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-23 01:50:45,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:45,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 01:50:45,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:45,261 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 01:50:45,261 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 2 case distinctions, treesize of input 32 treesize of output 39 [2021-11-23 01:50:45,266 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 41 treesize of output 39 [2021-11-23 01:50:49,863 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:49,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:50,213 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 36 treesize of output 34 [2021-11-23 01:50:50,226 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:50,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1970766961] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:50:50,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1591188654] [2021-11-23 01:50:50,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:50:50,227 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:50:50,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:50:50,228 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:50:50,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 01:50:50,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:50:50,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 01:50:50,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:50,374 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 01:50:50,375 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 2 case distinctions, treesize of input 31 treesize of output 38 [2021-11-23 01:50:50,378 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 40 treesize of output 38 [2021-11-23 01:50:50,707 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:50,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:51,046 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 33 treesize of output 31 [2021-11-23 01:50:51,069 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:50:51,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1591188654] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:50:51,069 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:50:51,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 15 [2021-11-23 01:50:51,070 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801642068] [2021-11-23 01:50:51,070 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:50:51,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 01:50:51,071 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:50:51,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 01:50:51,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=165, Unknown=0, NotChecked=0, Total=240 [2021-11-23 01:50:51,072 INFO L87 Difference]: Start difference. First operand 84 states and 98 transitions. Second operand has 16 states, 15 states have (on average 2.933333333333333) internal successors, (44), 16 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:53,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:50:53,576 INFO L93 Difference]: Finished difference Result 92 states and 108 transitions. [2021-11-23 01:50:53,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 01:50:53,578 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.933333333333333) internal successors, (44), 16 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-23 01:50:53,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:50:53,579 INFO L225 Difference]: With dead ends: 92 [2021-11-23 01:50:53,579 INFO L226 Difference]: Without dead ends: 92 [2021-11-23 01:50:53,579 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=91, Invalid=215, Unknown=0, NotChecked=0, Total=306 [2021-11-23 01:50:53,580 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 13 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 01:50:53,580 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 183 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 55 Invalid, 0 Unknown, 26 Unchecked, 0.4s Time] [2021-11-23 01:50:53,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-23 01:50:53,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-11-23 01:50:53,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 81 states have (on average 1.3333333333333333) internal successors, (108), 91 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:53,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 108 transitions. [2021-11-23 01:50:53,586 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 108 transitions. Word has length 17 [2021-11-23 01:50:53,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:50:53,586 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 108 transitions. [2021-11-23 01:50:53,587 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.933333333333333) internal successors, (44), 16 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:50:53,587 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 108 transitions. [2021-11-23 01:50:53,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 01:50:53,592 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:50:53,592 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1] [2021-11-23 01:50:53,618 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:53,810 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 01:50:54,005 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (22)] Ended with exit code 0 [2021-11-23 01:50:54,204 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 01:50:54,204 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:50:54,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:50:54,204 INFO L85 PathProgramCache]: Analyzing trace with hash -472171212, now seen corresponding path program 2 times [2021-11-23 01:50:54,205 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:50:54,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1494338110] [2021-11-23 01:50:54,205 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:50:54,205 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:50:54,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:50:54,206 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:50:54,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 01:50:54,256 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:50:54,256 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:50:54,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 01:50:54,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:54,318 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-23 01:50:54,319 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 2 case distinctions, treesize of input 42 treesize of output 45 [2021-11-23 01:50:54,324 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:50:54,325 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 48 treesize of output 44 [2021-11-23 01:50:55,861 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:55,862 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:56,763 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:50:56,763 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 74 treesize of output 70 [2021-11-23 01:50:56,851 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:56,851 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:50:56,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1494338110] [2021-11-23 01:50:56,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1494338110] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:50:56,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [825729141] [2021-11-23 01:50:56,852 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:50:56,852 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:50:56,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:50:56,853 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:50:56,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-23 01:50:56,989 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:50:56,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:50:56,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 01:50:56,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:57,133 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-23 01:50:57,133 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 2 case distinctions, treesize of input 44 treesize of output 47 [2021-11-23 01:50:57,142 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:50:57,142 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 50 treesize of output 46 [2021-11-23 01:50:58,612 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:58,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:50:59,026 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:50:59,026 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 73 treesize of output 69 [2021-11-23 01:50:59,041 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:50:59,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [825729141] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:50:59,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [339860043] [2021-11-23 01:50:59,042 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:50:59,042 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:50:59,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:50:59,048 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:50:59,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 01:50:59,098 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:50:59,099 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:50:59,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 01:50:59,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:50:59,159 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-23 01:50:59,159 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 2 case distinctions, treesize of input 41 treesize of output 44 [2021-11-23 01:50:59,172 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:50:59,172 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 47 treesize of output 43 [2021-11-23 01:51:00,285 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:51:00,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:00,679 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:51:00,679 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 75 treesize of output 71 [2021-11-23 01:51:00,695 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:51:00,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [339860043] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:00,695 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:51:00,696 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 18 [2021-11-23 01:51:00,696 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337809852] [2021-11-23 01:51:00,696 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:51:00,696 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-23 01:51:00,696 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:51:00,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-23 01:51:00,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=244, Unknown=0, NotChecked=0, Total=342 [2021-11-23 01:51:00,697 INFO L87 Difference]: Start difference. First operand 92 states and 108 transitions. Second operand has 19 states, 18 states have (on average 2.888888888888889) internal successors, (52), 19 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:02,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:02,684 INFO L93 Difference]: Finished difference Result 124 states and 148 transitions. [2021-11-23 01:51:02,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 01:51:02,685 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.888888888888889) internal successors, (52), 19 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-23 01:51:02,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:02,685 INFO L225 Difference]: With dead ends: 124 [2021-11-23 01:51:02,686 INFO L226 Difference]: Without dead ends: 124 [2021-11-23 01:51:02,686 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=219, Invalid=537, Unknown=0, NotChecked=0, Total=756 [2021-11-23 01:51:02,687 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 14 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 77 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 01:51:02,687 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 293 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 63 Invalid, 0 Unknown, 77 Unchecked, 0.5s Time] [2021-11-23 01:51:02,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-23 01:51:02,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2021-11-23 01:51:02,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 113 states have (on average 1.3097345132743363) internal successors, (148), 123 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:02,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 148 transitions. [2021-11-23 01:51:02,693 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 148 transitions. Word has length 19 [2021-11-23 01:51:02,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:02,693 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 148 transitions. [2021-11-23 01:51:02,693 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.888888888888889) internal successors, (52), 19 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:02,694 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 148 transitions. [2021-11-23 01:51:02,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-23 01:51:02,695 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:02,695 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] [2021-11-23 01:51:02,702 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:02,916 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:03,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:03,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:51:03,297 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:51:03,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:03,298 INFO L85 PathProgramCache]: Analyzing trace with hash -1860319208, now seen corresponding path program 1 times [2021-11-23 01:51:03,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:51:03,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [950871250] [2021-11-23 01:51:03,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:03,298 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:51:03,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:51:03,299 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:51:03,300 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 01:51:03,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:03,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 01:51:03,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:03,391 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:51:03,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:03,436 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:51:03,436 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:51:03,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [950871250] [2021-11-23 01:51:03,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [950871250] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 01:51:03,437 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:51:03,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-23 01:51:03,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297341243] [2021-11-23 01:51:03,437 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 01:51:03,437 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 01:51:03,437 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:51:03,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 01:51:03,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 01:51:03,438 INFO L87 Difference]: Start difference. First operand 124 states and 148 transitions. Second operand has 6 states, 6 states have (on average 6.0) internal successors, (36), 6 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:03,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:03,612 INFO L93 Difference]: Finished difference Result 187 states and 220 transitions. [2021-11-23 01:51:03,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 01:51:03,614 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 6.0) internal successors, (36), 6 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-23 01:51:03,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:03,615 INFO L225 Difference]: With dead ends: 187 [2021-11-23 01:51:03,615 INFO L226 Difference]: Without dead ends: 187 [2021-11-23 01:51:03,615 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2021-11-23 01:51:03,616 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 114 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:51:03,616 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 136 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:51:03,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-11-23 01:51:03,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 125. [2021-11-23 01:51:03,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 114 states have (on average 1.3070175438596492) internal successors, (149), 124 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:03,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 149 transitions. [2021-11-23 01:51:03,622 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 149 transitions. Word has length 20 [2021-11-23 01:51:03,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:03,622 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 149 transitions. [2021-11-23 01:51:03,622 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 6.0) internal successors, (36), 6 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:03,622 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 149 transitions. [2021-11-23 01:51:03,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-23 01:51:03,623 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:03,631 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] [2021-11-23 01:51:03,642 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:03,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:51:03,842 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:51:03,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:03,842 INFO L85 PathProgramCache]: Analyzing trace with hash -1860318342, now seen corresponding path program 1 times [2021-11-23 01:51:03,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:51:03,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [35004292] [2021-11-23 01:51:03,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:03,842 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:51:03,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:51:03,843 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:51:03,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 01:51:03,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:03,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 01:51:03,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:03,950 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:03,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:03,987 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:03,987 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:51:03,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [35004292] [2021-11-23 01:51:03,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [35004292] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 01:51:03,987 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:51:03,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-23 01:51:03,988 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816446223] [2021-11-23 01:51:03,988 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 01:51:03,988 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 01:51:03,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:51:03,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 01:51:03,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 01:51:03,989 INFO L87 Difference]: Start difference. First operand 125 states and 149 transitions. Second operand has 4 states, 3 states have (on average 6.666666666666667) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:04,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:04,097 INFO L93 Difference]: Finished difference Result 123 states and 147 transitions. [2021-11-23 01:51:04,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 01:51:04,098 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 6.666666666666667) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-23 01:51:04,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:04,098 INFO L225 Difference]: With dead ends: 123 [2021-11-23 01:51:04,099 INFO L226 Difference]: Without dead ends: 123 [2021-11-23 01:51:04,099 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 01:51:04,100 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 42 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:51:04,100 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 48 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:51:04,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-23 01:51:04,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2021-11-23 01:51:04,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 114 states have (on average 1.2894736842105263) internal successors, (147), 122 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:04,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 147 transitions. [2021-11-23 01:51:04,105 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 147 transitions. Word has length 20 [2021-11-23 01:51:04,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:04,105 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 147 transitions. [2021-11-23 01:51:04,105 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 6.666666666666667) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:04,106 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 147 transitions. [2021-11-23 01:51:04,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-23 01:51:04,107 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:04,107 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] [2021-11-23 01:51:04,123 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (28)] Ended with exit code 0 [2021-11-23 01:51:04,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:51:04,318 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:51:04,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:04,318 INFO L85 PathProgramCache]: Analyzing trace with hash -1860318341, now seen corresponding path program 1 times [2021-11-23 01:51:04,318 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:51:04,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [118419149] [2021-11-23 01:51:04,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:04,319 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:51:04,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:51:04,320 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:51:04,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 01:51:04,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:04,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 01:51:04,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:04,485 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:04,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:04,747 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 25 treesize of output 21 [2021-11-23 01:51:04,826 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:04,826 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:51:04,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [118419149] [2021-11-23 01:51:04,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [118419149] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:04,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [641845856] [2021-11-23 01:51:04,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:04,828 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:51:04,828 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:51:04,833 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:51:04,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-23 01:51:04,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:04,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 01:51:04,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:05,034 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:05,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:05,203 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 25 treesize of output 21 [2021-11-23 01:51:05,235 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:05,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [641845856] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:05,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2099085737] [2021-11-23 01:51:05,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:05,236 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:51:05,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:51:05,236 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:51:05,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-23 01:51:05,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:05,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 01:51:05,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:05,408 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:05,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:05,564 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 25 treesize of output 21 [2021-11-23 01:51:05,601 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:05,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2099085737] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:05,601 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:51:05,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 7 [2021-11-23 01:51:05,602 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433274204] [2021-11-23 01:51:05,602 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:51:05,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 01:51:05,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:51:05,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 01:51:05,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-23 01:51:05,603 INFO L87 Difference]: Start difference. First operand 123 states and 147 transitions. Second operand has 8 states, 7 states have (on average 5.142857142857143) internal successors, (36), 8 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:06,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:06,369 INFO L93 Difference]: Finished difference Result 202 states and 242 transitions. [2021-11-23 01:51:06,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 01:51:06,371 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.142857142857143) internal successors, (36), 8 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-23 01:51:06,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:06,372 INFO L225 Difference]: With dead ends: 202 [2021-11-23 01:51:06,372 INFO L226 Difference]: Without dead ends: 202 [2021-11-23 01:51:06,373 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2021-11-23 01:51:06,373 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 218 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 01:51:06,374 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 102 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 01:51:06,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-11-23 01:51:06,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 127. [2021-11-23 01:51:06,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 118 states have (on average 1.2966101694915255) internal successors, (153), 126 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:06,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 153 transitions. [2021-11-23 01:51:06,379 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 153 transitions. Word has length 20 [2021-11-23 01:51:06,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:06,379 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 153 transitions. [2021-11-23 01:51:06,379 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.142857142857143) internal successors, (36), 8 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:06,380 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 153 transitions. [2021-11-23 01:51:06,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-23 01:51:06,381 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:06,381 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:51:06,382 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:06,604 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:06,788 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (29)] Ended with exit code 0 [2021-11-23 01:51:06,981 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:51:06,982 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:51:06,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:06,982 INFO L85 PathProgramCache]: Analyzing trace with hash -1835293711, now seen corresponding path program 1 times [2021-11-23 01:51:06,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:51:06,982 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1177061077] [2021-11-23 01:51:06,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:06,983 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:51:06,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:51:06,984 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:51:06,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 01:51:07,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:07,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 01:51:07,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:07,077 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:07,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:07,105 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:07,106 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:51:07,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1177061077] [2021-11-23 01:51:07,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1177061077] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 01:51:07,106 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:51:07,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-23 01:51:07,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825912350] [2021-11-23 01:51:07,106 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 01:51:07,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 01:51:07,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:51:07,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 01:51:07,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 01:51:07,107 INFO L87 Difference]: Start difference. First operand 127 states and 153 transitions. Second operand has 4 states, 3 states have (on average 7.0) internal successors, (21), 4 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:07,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:07,189 INFO L93 Difference]: Finished difference Result 126 states and 152 transitions. [2021-11-23 01:51:07,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 01:51:07,189 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 7.0) internal successors, (21), 4 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-23 01:51:07,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:07,190 INFO L225 Difference]: With dead ends: 126 [2021-11-23 01:51:07,190 INFO L226 Difference]: Without dead ends: 126 [2021-11-23 01:51:07,191 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 01:51:07,191 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 45 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:51:07,192 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 49 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:51:07,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-23 01:51:07,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2021-11-23 01:51:07,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 118 states have (on average 1.2881355932203389) internal successors, (152), 125 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:07,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 152 transitions. [2021-11-23 01:51:07,197 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 152 transitions. Word has length 21 [2021-11-23 01:51:07,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:07,197 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 152 transitions. [2021-11-23 01:51:07,197 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 7.0) internal successors, (21), 4 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:07,197 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 152 transitions. [2021-11-23 01:51:07,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-23 01:51:07,198 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:07,198 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:51:07,211 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:07,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:51:07,410 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:51:07,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:07,410 INFO L85 PathProgramCache]: Analyzing trace with hash -1835293710, now seen corresponding path program 1 times [2021-11-23 01:51:07,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:51:07,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [83181739] [2021-11-23 01:51:07,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:07,410 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:51:07,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:51:07,411 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:51:07,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-23 01:51:07,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:07,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 01:51:07,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:07,596 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:07,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:07,848 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 25 treesize of output 21 [2021-11-23 01:51:08,014 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:08,014 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:51:08,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [83181739] [2021-11-23 01:51:08,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [83181739] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:08,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1851602020] [2021-11-23 01:51:08,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:08,015 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:51:08,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:51:08,020 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:51:08,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-23 01:51:08,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:08,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 01:51:08,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:08,256 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:08,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:08,384 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 25 treesize of output 21 [2021-11-23 01:51:08,441 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:08,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1851602020] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:08,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1827975487] [2021-11-23 01:51:08,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:08,442 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:51:08,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:51:08,442 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:51:08,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-23 01:51:08,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:08,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 01:51:08,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:08,579 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:08,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:08,697 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 25 treesize of output 21 [2021-11-23 01:51:08,764 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:08,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1827975487] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:08,765 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:51:08,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 11 [2021-11-23 01:51:08,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796323504] [2021-11-23 01:51:08,765 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:51:08,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 01:51:08,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:51:08,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 01:51:08,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-23 01:51:08,766 INFO L87 Difference]: Start difference. First operand 126 states and 152 transitions. Second operand has 12 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 12 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:09,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:09,602 INFO L93 Difference]: Finished difference Result 208 states and 249 transitions. [2021-11-23 01:51:09,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 01:51:09,603 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 12 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-23 01:51:09,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:09,605 INFO L225 Difference]: With dead ends: 208 [2021-11-23 01:51:09,605 INFO L226 Difference]: Without dead ends: 208 [2021-11-23 01:51:09,605 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=122, Invalid=258, Unknown=0, NotChecked=0, Total=380 [2021-11-23 01:51:09,606 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 293 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 293 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 01:51:09,606 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [293 Valid, 143 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 01:51:09,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-11-23 01:51:09,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 129. [2021-11-23 01:51:09,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 121 states have (on average 1.2892561983471074) internal successors, (156), 128 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:09,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 156 transitions. [2021-11-23 01:51:09,610 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 156 transitions. Word has length 21 [2021-11-23 01:51:09,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:09,611 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 156 transitions. [2021-11-23 01:51:09,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.4545454545454546) internal successors, (38), 12 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:09,611 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 156 transitions. [2021-11-23 01:51:09,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-23 01:51:09,612 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:09,612 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:51:09,633 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-11-23 01:51:09,821 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (34)] Ended with exit code 0 [2021-11-23 01:51:10,026 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:10,220 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:51:10,220 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:51:10,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:10,220 INFO L85 PathProgramCache]: Analyzing trace with hash -1059572912, now seen corresponding path program 1 times [2021-11-23 01:51:10,221 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:51:10,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [317238765] [2021-11-23 01:51:10,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:10,221 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:51:10,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:51:10,222 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:51:10,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 01:51:10,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:10,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 01:51:10,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:10,358 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:51:10,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:10,418 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:51:10,418 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:51:10,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [317238765] [2021-11-23 01:51:10,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [317238765] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 01:51:10,418 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:51:10,419 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2021-11-23 01:51:10,419 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695300089] [2021-11-23 01:51:10,419 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 01:51:10,419 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 01:51:10,419 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:51:10,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 01:51:10,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-23 01:51:10,420 INFO L87 Difference]: Start difference. First operand 129 states and 156 transitions. Second operand has 8 states, 8 states have (on average 4.75) internal successors, (38), 8 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:10,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:10,540 INFO L93 Difference]: Finished difference Result 156 states and 185 transitions. [2021-11-23 01:51:10,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 01:51:10,552 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 8 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-23 01:51:10,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:10,553 INFO L225 Difference]: With dead ends: 156 [2021-11-23 01:51:10,553 INFO L226 Difference]: Without dead ends: 156 [2021-11-23 01:51:10,553 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=99, Unknown=0, NotChecked=0, Total=156 [2021-11-23 01:51:10,554 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 125 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:51:10,554 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 123 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:51:10,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-11-23 01:51:10,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 127. [2021-11-23 01:51:10,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 120 states have (on average 1.2666666666666666) internal successors, (152), 126 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:10,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 152 transitions. [2021-11-23 01:51:10,559 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 152 transitions. Word has length 22 [2021-11-23 01:51:10,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:10,560 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 152 transitions. [2021-11-23 01:51:10,560 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 8 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:10,560 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 152 transitions. [2021-11-23 01:51:10,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 01:51:10,561 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:10,561 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:51:10,570 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:10,769 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:51:10,770 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:51:10,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:10,770 INFO L85 PathProgramCache]: Analyzing trace with hash -747793046, now seen corresponding path program 1 times [2021-11-23 01:51:10,770 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:51:10,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1471562158] [2021-11-23 01:51:10,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:10,770 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:51:10,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:51:10,771 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:51:10,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 01:51:10,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:10,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 01:51:10,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:10,907 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:51:10,908 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:10,986 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:51:10,986 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:51:10,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1471562158] [2021-11-23 01:51:10,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1471562158] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:10,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1719284777] [2021-11-23 01:51:10,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:10,986 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:51:10,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:51:10,987 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:51:10,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-23 01:51:11,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:11,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 01:51:11,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:11,141 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:51:11,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:11,188 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:51:11,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1719284777] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:11,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1253956081] [2021-11-23 01:51:11,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:11,189 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:51:11,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:51:11,189 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:51:11,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-23 01:51:11,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:11,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 01:51:11,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:11,296 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:51:11,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:11,362 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:51:11,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1253956081] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:11,362 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:51:11,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 10 [2021-11-23 01:51:11,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713609979] [2021-11-23 01:51:11,363 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:51:11,363 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 01:51:11,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:51:11,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 01:51:11,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-23 01:51:11,364 INFO L87 Difference]: Start difference. First operand 127 states and 152 transitions. Second operand has 10 states, 10 states have (on average 4.5) internal successors, (45), 10 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:11,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:11,472 INFO L93 Difference]: Finished difference Result 161 states and 189 transitions. [2021-11-23 01:51:11,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 01:51:11,473 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.5) internal successors, (45), 10 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-23 01:51:11,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:11,473 INFO L225 Difference]: With dead ends: 161 [2021-11-23 01:51:11,473 INFO L226 Difference]: Without dead ends: 161 [2021-11-23 01:51:11,474 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2021-11-23 01:51:11,474 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 108 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:51:11,475 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 254 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:51:11,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-11-23 01:51:11,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 143. [2021-11-23 01:51:11,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 136 states have (on average 1.286764705882353) internal successors, (175), 142 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:11,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 175 transitions. [2021-11-23 01:51:11,479 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 175 transitions. Word has length 25 [2021-11-23 01:51:11,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:11,479 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 175 transitions. [2021-11-23 01:51:11,479 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.5) internal successors, (45), 10 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:11,479 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 175 transitions. [2021-11-23 01:51:11,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 01:51:11,480 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:11,480 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:51:11,482 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (38)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:11,689 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:11,902 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:12,082 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:51:12,082 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:51:12,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:12,083 INFO L85 PathProgramCache]: Analyzing trace with hash -528938328, now seen corresponding path program 1 times [2021-11-23 01:51:12,083 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:51:12,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1741782820] [2021-11-23 01:51:12,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:12,083 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:51:12,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:51:12,084 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:51:12,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-23 01:51:12,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:12,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 01:51:12,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:12,321 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:12,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:12,486 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:12,486 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:51:12,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1741782820] [2021-11-23 01:51:12,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1741782820] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:12,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1277901363] [2021-11-23 01:51:12,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:12,487 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:51:12,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:51:12,488 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:51:12,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-23 01:51:12,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:12,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 01:51:12,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:12,810 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:12,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:12,883 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:12,884 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1277901363] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:12,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940279523] [2021-11-23 01:51:12,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:12,884 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:51:12,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:51:12,888 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:51:12,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-23 01:51:12,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:12,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 01:51:12,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:13,047 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:13,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:13,126 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:13,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [940279523] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:13,127 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:51:13,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9, 8, 9, 8] total 22 [2021-11-23 01:51:13,127 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112269779] [2021-11-23 01:51:13,127 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:51:13,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 01:51:13,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:51:13,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 01:51:13,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2021-11-23 01:51:13,129 INFO L87 Difference]: Start difference. First operand 143 states and 175 transitions. Second operand has 22 states, 22 states have (on average 2.9545454545454546) internal successors, (65), 22 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:13,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:13,581 INFO L93 Difference]: Finished difference Result 183 states and 222 transitions. [2021-11-23 01:51:13,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 01:51:13,582 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.9545454545454546) internal successors, (65), 22 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-23 01:51:13,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:13,583 INFO L225 Difference]: With dead ends: 183 [2021-11-23 01:51:13,583 INFO L226 Difference]: Without dead ends: 183 [2021-11-23 01:51:13,583 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=178, Invalid=578, Unknown=0, NotChecked=0, Total=756 [2021-11-23 01:51:13,584 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 318 mSDsluCounter, 345 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 318 SdHoareTripleChecker+Valid, 389 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 01:51:13,584 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [318 Valid, 389 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 01:51:13,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-11-23 01:51:13,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 143. [2021-11-23 01:51:13,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 136 states have (on average 1.286764705882353) internal successors, (175), 142 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:13,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 175 transitions. [2021-11-23 01:51:13,589 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 175 transitions. Word has length 25 [2021-11-23 01:51:13,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:13,590 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 175 transitions. [2021-11-23 01:51:13,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.9545454545454546) internal successors, (65), 22 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:13,590 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 175 transitions. [2021-11-23 01:51:13,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 01:51:13,591 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:13,591 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:51:13,601 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (40)] Ended with exit code 0 [2021-11-23 01:51:13,820 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:14,002 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (41)] Ended with exit code 0 [2021-11-23 01:51:14,200 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 01:51:14,200 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:51:14,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:14,201 INFO L85 PathProgramCache]: Analyzing trace with hash -1117279393, now seen corresponding path program 2 times [2021-11-23 01:51:14,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:51:14,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [907143847] [2021-11-23 01:51:14,201 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:51:14,201 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:51:14,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:51:14,202 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:51:14,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-23 01:51:14,262 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:51:14,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:51:14,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 01:51:14,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:14,324 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 01:51:14,324 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 2 case distinctions, treesize of input 32 treesize of output 39 [2021-11-23 01:51:14,327 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 41 treesize of output 39 [2021-11-23 01:51:23,235 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:23,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:24,783 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 57 treesize of output 55 [2021-11-23 01:51:24,875 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:24,875 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:51:24,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [907143847] [2021-11-23 01:51:24,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [907143847] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:24,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1291500784] [2021-11-23 01:51:24,876 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:51:24,876 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:51:24,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:51:24,903 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:51:24,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-23 01:51:25,028 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:51:25,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:51:25,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 01:51:25,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:25,086 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 01:51:25,086 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 2 case distinctions, treesize of input 32 treesize of output 39 [2021-11-23 01:51:25,089 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 41 treesize of output 39 [2021-11-23 01:51:27,663 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:27,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:28,390 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 33 treesize of output 31 [2021-11-23 01:51:28,465 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:28,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1291500784] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:28,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778533129] [2021-11-23 01:51:28,466 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:51:28,466 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:51:28,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:51:28,467 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:51:28,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-23 01:51:28,522 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:51:28,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:51:28,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 01:51:28,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:28,586 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 01:51:28,586 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 2 case distinctions, treesize of input 32 treesize of output 39 [2021-11-23 01:51:28,590 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 41 treesize of output 39 [2021-11-23 01:51:29,048 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:29,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:29,574 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 33 treesize of output 31 [2021-11-23 01:51:29,583 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:29,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1778533129] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:29,583 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:51:29,584 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 8, 8, 8] total 22 [2021-11-23 01:51:29,584 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512259530] [2021-11-23 01:51:29,584 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:51:29,584 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-23 01:51:29,584 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:51:29,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-23 01:51:29,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=359, Unknown=0, NotChecked=0, Total=506 [2021-11-23 01:51:29,585 INFO L87 Difference]: Start difference. First operand 143 states and 175 transitions. Second operand has 23 states, 22 states have (on average 3.1363636363636362) internal successors, (69), 23 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:35,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:35,408 INFO L93 Difference]: Finished difference Result 159 states and 195 transitions. [2021-11-23 01:51:35,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 01:51:35,411 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 3.1363636363636362) internal successors, (69), 23 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-23 01:51:35,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:35,411 INFO L225 Difference]: With dead ends: 159 [2021-11-23 01:51:35,411 INFO L226 Difference]: Without dead ends: 159 [2021-11-23 01:51:35,412 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 125 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=299, Invalid=757, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 01:51:35,413 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 32 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 260 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 01:51:35,413 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 260 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 105 Invalid, 0 Unknown, 21 Unchecked, 0.8s Time] [2021-11-23 01:51:35,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-11-23 01:51:35,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2021-11-23 01:51:35,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 152 states have (on average 1.2828947368421053) internal successors, (195), 158 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:35,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 195 transitions. [2021-11-23 01:51:35,418 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 195 transitions. Word has length 25 [2021-11-23 01:51:35,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:35,418 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 195 transitions. [2021-11-23 01:51:35,419 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 3.1363636363636362) internal successors, (69), 23 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:35,419 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 195 transitions. [2021-11-23 01:51:35,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 01:51:35,420 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:35,420 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:51:35,428 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:35,647 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2021-11-23 01:51:35,829 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (44)] Ended with exit code 0 [2021-11-23 01:51:36,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 01:51:36,028 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:51:36,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:36,028 INFO L85 PathProgramCache]: Analyzing trace with hash -1706790696, now seen corresponding path program 1 times [2021-11-23 01:51:36,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:51:36,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1642404426] [2021-11-23 01:51:36,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:36,029 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:51:36,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:51:36,030 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:51:36,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-23 01:51:36,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:36,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 01:51:36,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:36,128 INFO L354 Elim1Store]: treesize reduction 39, result has 29.1 percent of original size [2021-11-23 01:51:36,128 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 2 case distinctions, treesize of input 12 treesize of output 21 [2021-11-23 01:51:36,193 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:51:36,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:36,253 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:51:36,253 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:51:36,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1642404426] [2021-11-23 01:51:36,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1642404426] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 01:51:36,253 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:51:36,253 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-23 01:51:36,254 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835050801] [2021-11-23 01:51:36,254 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 01:51:36,254 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 01:51:36,254 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:51:36,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 01:51:36,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 01:51:36,254 INFO L87 Difference]: Start difference. First operand 159 states and 195 transitions. Second operand has 4 states, 3 states have (on average 8.666666666666666) internal successors, (26), 4 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:36,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:36,334 INFO L93 Difference]: Finished difference Result 158 states and 193 transitions. [2021-11-23 01:51:36,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 01:51:36,334 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 8.666666666666666) internal successors, (26), 4 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-23 01:51:36,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:36,335 INFO L225 Difference]: With dead ends: 158 [2021-11-23 01:51:36,335 INFO L226 Difference]: Without dead ends: 158 [2021-11-23 01:51:36,335 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 01:51:36,336 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 29 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:51:36,336 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 50 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:51:36,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-11-23 01:51:36,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 158. [2021-11-23 01:51:36,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 152 states have (on average 1.269736842105263) internal successors, (193), 157 states have internal predecessors, (193), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:36,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 193 transitions. [2021-11-23 01:51:36,341 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 193 transitions. Word has length 26 [2021-11-23 01:51:36,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:36,341 INFO L470 AbstractCegarLoop]: Abstraction has 158 states and 193 transitions. [2021-11-23 01:51:36,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 8.666666666666666) internal successors, (26), 4 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:36,342 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 193 transitions. [2021-11-23 01:51:36,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 01:51:36,342 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:36,343 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:51:36,352 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (46)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:36,551 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:51:36,552 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:51:36,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:36,552 INFO L85 PathProgramCache]: Analyzing trace with hash -1706790695, now seen corresponding path program 1 times [2021-11-23 01:51:36,552 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:51:36,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [835038029] [2021-11-23 01:51:36,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:36,553 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:51:36,553 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:51:36,553 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:51:36,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-23 01:51:36,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:36,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 01:51:36,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:36,676 INFO L354 Elim1Store]: treesize reduction 38, result has 35.6 percent of original size [2021-11-23 01:51:36,676 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 2 case distinctions, treesize of input 14 treesize of output 26 [2021-11-23 01:51:36,830 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:51:36,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:37,268 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:51:37,268 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:51:37,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [835038029] [2021-11-23 01:51:37,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [835038029] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 01:51:37,269 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:51:37,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2021-11-23 01:51:37,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659140346] [2021-11-23 01:51:37,269 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 01:51:37,269 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 01:51:37,269 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:51:37,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 01:51:37,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-23 01:51:37,270 INFO L87 Difference]: Start difference. First operand 158 states and 193 transitions. Second operand has 8 states, 7 states have (on average 7.142857142857143) internal successors, (50), 8 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:37,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:37,855 INFO L93 Difference]: Finished difference Result 300 states and 370 transitions. [2021-11-23 01:51:37,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 01:51:37,856 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 7.142857142857143) internal successors, (50), 8 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-23 01:51:37,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:37,859 INFO L225 Difference]: With dead ends: 300 [2021-11-23 01:51:37,859 INFO L226 Difference]: Without dead ends: 300 [2021-11-23 01:51:37,860 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=101, Unknown=0, NotChecked=0, Total=156 [2021-11-23 01:51:37,860 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 231 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 01:51:37,861 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [231 Valid, 128 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 01:51:37,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2021-11-23 01:51:37,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 184. [2021-11-23 01:51:37,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 178 states have (on average 1.297752808988764) internal successors, (231), 183 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:37,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 231 transitions. [2021-11-23 01:51:37,868 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 231 transitions. Word has length 26 [2021-11-23 01:51:37,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:37,868 INFO L470 AbstractCegarLoop]: Abstraction has 184 states and 231 transitions. [2021-11-23 01:51:37,868 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 7.142857142857143) internal successors, (50), 8 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:37,868 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 231 transitions. [2021-11-23 01:51:37,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 01:51:37,869 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:37,869 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:51:37,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (47)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:38,080 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:51:38,081 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:51:38,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:38,081 INFO L85 PathProgramCache]: Analyzing trace with hash 460228407, now seen corresponding path program 1 times [2021-11-23 01:51:38,081 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:51:38,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [280485736] [2021-11-23 01:51:38,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:38,081 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:51:38,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:51:38,082 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:51:38,084 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 01:51:38,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:38,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 01:51:38,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:38,184 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:51:38,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:38,216 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:51:38,216 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:51:38,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [280485736] [2021-11-23 01:51:38,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [280485736] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 01:51:38,216 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:51:38,216 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-23 01:51:38,217 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132377882] [2021-11-23 01:51:38,217 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 01:51:38,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 01:51:38,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:51:38,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 01:51:38,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 01:51:38,218 INFO L87 Difference]: Start difference. First operand 184 states and 231 transitions. Second operand has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:38,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:38,230 INFO L93 Difference]: Finished difference Result 195 states and 243 transitions. [2021-11-23 01:51:38,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 01:51:38,231 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-23 01:51:38,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:38,232 INFO L225 Difference]: With dead ends: 195 [2021-11-23 01:51:38,232 INFO L226 Difference]: Without dead ends: 195 [2021-11-23 01:51:38,232 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 01:51:38,233 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 11 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 01:51:38,233 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 66 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 01:51:38,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-11-23 01:51:38,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 188. [2021-11-23 01:51:38,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 182 states have (on average 1.2912087912087913) internal successors, (235), 187 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:38,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 235 transitions. [2021-11-23 01:51:38,239 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 235 transitions. Word has length 28 [2021-11-23 01:51:38,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:38,239 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 235 transitions. [2021-11-23 01:51:38,240 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:38,240 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 235 transitions. [2021-11-23 01:51:38,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 01:51:38,241 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:38,241 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:51:38,252 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (48)] Ended with exit code 0 [2021-11-23 01:51:38,451 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:51:38,452 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:51:38,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:38,452 INFO L85 PathProgramCache]: Analyzing trace with hash -1314778955, now seen corresponding path program 1 times [2021-11-23 01:51:38,452 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:51:38,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1813087876] [2021-11-23 01:51:38,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:38,453 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:51:38,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:51:38,453 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:51:38,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2021-11-23 01:51:38,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:38,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 01:51:38,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:40,967 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:51:40,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:43,181 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:51:43,182 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:51:43,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1813087876] [2021-11-23 01:51:43,182 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1813087876] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 01:51:43,182 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:51:43,182 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-23 01:51:43,182 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202696286] [2021-11-23 01:51:43,182 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 01:51:43,183 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 01:51:43,183 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:51:43,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 01:51:43,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=25, Unknown=2, NotChecked=0, Total=42 [2021-11-23 01:51:43,184 INFO L87 Difference]: Start difference. First operand 188 states and 235 transitions. Second operand has 7 states, 6 states have (on average 9.166666666666666) internal successors, (55), 7 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:43,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:43,313 INFO L93 Difference]: Finished difference Result 187 states and 234 transitions. [2021-11-23 01:51:43,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 01:51:43,314 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 9.166666666666666) internal successors, (55), 7 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-23 01:51:43,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:43,316 INFO L225 Difference]: With dead ends: 187 [2021-11-23 01:51:43,316 INFO L226 Difference]: Without dead ends: 185 [2021-11-23 01:51:43,316 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=15, Invalid=25, Unknown=2, NotChecked=0, Total=42 [2021-11-23 01:51:43,316 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 22 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 14 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:51:43,317 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 85 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 14 Unchecked, 0.1s Time] [2021-11-23 01:51:43,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-11-23 01:51:43,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2021-11-23 01:51:43,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 180 states have (on average 1.2722222222222221) internal successors, (229), 184 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:43,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 229 transitions. [2021-11-23 01:51:43,322 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 229 transitions. Word has length 28 [2021-11-23 01:51:43,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:43,322 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 229 transitions. [2021-11-23 01:51:43,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 9.166666666666666) internal successors, (55), 7 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:43,323 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 229 transitions. [2021-11-23 01:51:43,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 01:51:43,323 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:43,323 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 01:51:43,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (49)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:43,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:51:43,535 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:51:43,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:43,535 INFO L85 PathProgramCache]: Analyzing trace with hash -1314778088, now seen corresponding path program 1 times [2021-11-23 01:51:43,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:51:43,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1245121077] [2021-11-23 01:51:43,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:43,536 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:51:43,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:51:43,537 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:51:43,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-23 01:51:43,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:43,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 01:51:43,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:43,750 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:51:43,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:43,841 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:51:43,841 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:51:43,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1245121077] [2021-11-23 01:51:43,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1245121077] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:43,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1043264801] [2021-11-23 01:51:43,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:43,842 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:51:43,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:51:43,853 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:51:43,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2021-11-23 01:51:43,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:43,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 01:51:43,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:44,047 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:51:44,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:44,106 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:51:44,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1043264801] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:44,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1533720067] [2021-11-23 01:51:44,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:44,106 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:51:44,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:51:44,107 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:51:44,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-23 01:51:44,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:44,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 01:51:44,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:44,242 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:51:44,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:44,301 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:51:44,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1533720067] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:44,301 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:51:44,301 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-23 01:51:44,301 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149463081] [2021-11-23 01:51:44,301 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:51:44,302 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 01:51:44,302 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:51:44,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 01:51:44,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-23 01:51:44,302 INFO L87 Difference]: Start difference. First operand 185 states and 229 transitions. Second operand has 8 states, 8 states have (on average 6.5) internal successors, (52), 8 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:44,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:44,384 INFO L93 Difference]: Finished difference Result 260 states and 314 transitions. [2021-11-23 01:51:44,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 01:51:44,385 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 6.5) internal successors, (52), 8 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-23 01:51:44,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:44,387 INFO L225 Difference]: With dead ends: 260 [2021-11-23 01:51:44,387 INFO L226 Difference]: Without dead ends: 222 [2021-11-23 01:51:44,387 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-23 01:51:44,388 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 44 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:51:44,388 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 143 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:51:44,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-11-23 01:51:44,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 219. [2021-11-23 01:51:44,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 214 states have (on average 1.266355140186916) internal successors, (271), 218 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:44,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 271 transitions. [2021-11-23 01:51:44,395 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 271 transitions. Word has length 28 [2021-11-23 01:51:44,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:44,396 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 271 transitions. [2021-11-23 01:51:44,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 6.5) internal successors, (52), 8 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:44,396 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 271 transitions. [2021-11-23 01:51:44,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 01:51:44,397 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:44,397 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 01:51:44,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (50)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:44,628 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2021-11-23 01:51:44,809 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (51)] Ended with exit code 0 [2021-11-23 01:51:45,008 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 01:51:45,008 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:51:45,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:45,008 INFO L85 PathProgramCache]: Analyzing trace with hash -1252738474, now seen corresponding path program 1 times [2021-11-23 01:51:45,009 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:51:45,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [674316532] [2021-11-23 01:51:45,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:45,009 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:51:45,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:51:45,010 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:51:45,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2021-11-23 01:51:45,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:45,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 01:51:45,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:45,281 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:51:45,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:45,435 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:51:45,435 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:51:45,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [674316532] [2021-11-23 01:51:45,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [674316532] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:45,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1644377017] [2021-11-23 01:51:45,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:45,436 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:51:45,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:51:45,436 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:51:45,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (54)] Waiting until timeout for monitored process [2021-11-23 01:51:45,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:45,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 01:51:45,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:45,668 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:51:45,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:45,749 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:51:45,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1644377017] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:45,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1936944308] [2021-11-23 01:51:45,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:51:45,750 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:51:45,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:51:45,751 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:51:45,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-23 01:51:45,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:51:45,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 01:51:45,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:45,946 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:51:45,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:46,020 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:51:46,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1936944308] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:46,020 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:51:46,020 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 8, 7, 8, 7] total 13 [2021-11-23 01:51:46,021 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177781269] [2021-11-23 01:51:46,021 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:51:46,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 01:51:46,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:51:46,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 01:51:46,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-23 01:51:46,025 INFO L87 Difference]: Start difference. First operand 219 states and 271 transitions. Second operand has 13 states, 13 states have (on average 4.0) internal successors, (52), 13 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:46,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:51:46,342 INFO L93 Difference]: Finished difference Result 294 states and 356 transitions. [2021-11-23 01:51:46,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 01:51:46,343 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 4.0) internal successors, (52), 13 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-23 01:51:46,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:51:46,345 INFO L225 Difference]: With dead ends: 294 [2021-11-23 01:51:46,345 INFO L226 Difference]: Without dead ends: 262 [2021-11-23 01:51:46,345 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=219, Unknown=0, NotChecked=0, Total=306 [2021-11-23 01:51:46,346 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 132 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 01:51:46,346 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 179 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 01:51:46,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2021-11-23 01:51:46,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 219. [2021-11-23 01:51:46,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 214 states have (on average 1.2616822429906542) internal successors, (270), 218 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:46,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 270 transitions. [2021-11-23 01:51:46,354 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 270 transitions. Word has length 28 [2021-11-23 01:51:46,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:51:46,354 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 270 transitions. [2021-11-23 01:51:46,354 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 4.0) internal successors, (52), 13 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:51:46,354 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 270 transitions. [2021-11-23 01:51:46,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 01:51:46,355 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:51:46,355 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:51:46,367 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (53)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:46,568 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (54)] Ended with exit code 0 [2021-11-23 01:51:46,787 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-23 01:51:46,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:51:46,967 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:51:46,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:51:46,967 INFO L85 PathProgramCache]: Analyzing trace with hash 1138703979, now seen corresponding path program 2 times [2021-11-23 01:51:46,967 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:51:46,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [112826187] [2021-11-23 01:51:46,968 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:51:46,968 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:51:46,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:51:46,969 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:51:46,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-23 01:51:47,042 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:51:47,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:51:47,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 01:51:47,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:47,281 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:47,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:51:47,874 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 27 treesize of output 23 [2021-11-23 01:51:48,199 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:48,200 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:51:48,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [112826187] [2021-11-23 01:51:48,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [112826187] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:51:48,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [198093729] [2021-11-23 01:51:48,200 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:51:48,201 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:51:48,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:51:48,201 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:51:48,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (57)] Waiting until timeout for monitored process [2021-11-23 01:51:48,333 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:51:48,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:51:48,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 01:51:48,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:51:48,434 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 01:51:48,434 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 2 case distinctions, treesize of input 31 treesize of output 38 [2021-11-23 01:51:48,437 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 40 treesize of output 38 [2021-11-23 01:51:59,628 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:51:59,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:52:00,785 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 34 treesize of output 32 [2021-11-23 01:52:00,792 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:52:00,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [198093729] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:52:00,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [651066252] [2021-11-23 01:52:00,793 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:52:00,793 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:52:00,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:52:00,794 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:52:00,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-23 01:52:00,868 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:52:00,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:52:00,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 01:52:00,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:52:00,993 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:52:00,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:52:01,173 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 27 treesize of output 23 [2021-11-23 01:52:01,293 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:52:01,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [651066252] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:52:01,293 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:52:01,293 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11, 10, 8, 8] total 30 [2021-11-23 01:52:01,294 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417781977] [2021-11-23 01:52:01,294 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:52:01,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-23 01:52:01,294 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:52:01,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-23 01:52:01,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=766, Unknown=0, NotChecked=0, Total=930 [2021-11-23 01:52:01,296 INFO L87 Difference]: Start difference. First operand 219 states and 270 transitions. Second operand has 31 states, 30 states have (on average 3.2) internal successors, (96), 31 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:52:03,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:52:03,479 INFO L93 Difference]: Finished difference Result 260 states and 319 transitions. [2021-11-23 01:52:03,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 01:52:03,489 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 3.2) internal successors, (96), 31 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-23 01:52:03,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:52:03,490 INFO L225 Difference]: With dead ends: 260 [2021-11-23 01:52:03,491 INFO L226 Difference]: Without dead ends: 260 [2021-11-23 01:52:03,492 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 483 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=252, Invalid=1230, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 01:52:03,493 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 37 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 54 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 01:52:03,493 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 288 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 79 Invalid, 0 Unknown, 54 Unchecked, 0.4s Time] [2021-11-23 01:52:03,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-11-23 01:52:03,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 233. [2021-11-23 01:52:03,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 228 states have (on average 1.263157894736842) internal successors, (288), 232 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:52:03,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 288 transitions. [2021-11-23 01:52:03,501 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 288 transitions. Word has length 29 [2021-11-23 01:52:03,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:52:03,501 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 288 transitions. [2021-11-23 01:52:03,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 3.2) internal successors, (96), 31 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:52:03,502 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 288 transitions. [2021-11-23 01:52:03,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-23 01:52:03,502 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:52:03,503 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:52:03,514 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (56)] Forceful destruction successful, exit code 0 [2021-11-23 01:52:03,716 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (57)] Forceful destruction successful, exit code 0 [2021-11-23 01:52:03,934 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Ended with exit code 0 [2021-11-23 01:52:04,114 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:52:04,115 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:52:04,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:52:04,115 INFO L85 PathProgramCache]: Analyzing trace with hash -112944909, now seen corresponding path program 2 times [2021-11-23 01:52:04,115 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:52:04,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1427130095] [2021-11-23 01:52:04,116 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:52:04,116 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:52:04,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:52:04,117 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:52:04,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (59)] Waiting until timeout for monitored process [2021-11-23 01:52:04,189 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:52:04,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:52:04,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 01:52:04,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:52:04,417 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:52:04,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:52:04,966 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 27 treesize of output 23 [2021-11-23 01:52:05,210 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:52:05,210 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:52:05,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1427130095] [2021-11-23 01:52:05,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1427130095] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:52:05,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [557063162] [2021-11-23 01:52:05,211 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:52:05,211 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:52:05,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:52:05,213 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:52:05,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (60)] Waiting until timeout for monitored process [2021-11-23 01:52:05,339 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:52:05,339 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:52:05,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 01:52:05,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:52:05,446 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-23 01:52:05,447 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 2 case distinctions, treesize of input 40 treesize of output 43 [2021-11-23 01:52:05,452 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:52:05,453 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 46 treesize of output 42 [2021-11-23 01:52:08,612 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:52:08,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:52:09,640 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:52:09,641 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 75 treesize of output 1 [2021-11-23 01:52:09,647 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:52:09,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [557063162] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:52:09,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1934872391] [2021-11-23 01:52:09,648 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:52:09,648 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:52:09,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:52:09,649 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:52:09,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-23 01:52:09,707 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:52:09,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:52:09,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 01:52:09,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:52:09,881 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:52:09,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:52:10,207 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 27 treesize of output 23 [2021-11-23 01:52:10,301 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:52:10,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1934872391] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:52:10,302 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:52:10,302 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 9, 8, 6, 6] total 23 [2021-11-23 01:52:10,302 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588858702] [2021-11-23 01:52:10,302 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:52:10,302 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-23 01:52:10,302 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:52:10,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-23 01:52:10,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2021-11-23 01:52:10,303 INFO L87 Difference]: Start difference. First operand 233 states and 288 transitions. Second operand has 24 states, 23 states have (on average 4.3478260869565215) internal successors, (100), 24 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:52:12,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:52:12,973 INFO L93 Difference]: Finished difference Result 424 states and 520 transitions. [2021-11-23 01:52:12,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 01:52:12,975 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 4.3478260869565215) internal successors, (100), 24 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-23 01:52:12,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:52:12,977 INFO L225 Difference]: With dead ends: 424 [2021-11-23 01:52:12,977 INFO L226 Difference]: Without dead ends: 424 [2021-11-23 01:52:12,978 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=209, Invalid=847, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 01:52:12,979 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 194 mSDsluCounter, 381 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 424 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 154 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 01:52:12,979 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 424 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 175 Invalid, 0 Unknown, 154 Unchecked, 0.9s Time] [2021-11-23 01:52:12,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2021-11-23 01:52:12,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 299. [2021-11-23 01:52:12,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 294 states have (on average 1.2687074829931972) internal successors, (373), 298 states have internal predecessors, (373), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:52:12,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 373 transitions. [2021-11-23 01:52:12,988 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 373 transitions. Word has length 32 [2021-11-23 01:52:12,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:52:12,989 INFO L470 AbstractCegarLoop]: Abstraction has 299 states and 373 transitions. [2021-11-23 01:52:12,989 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 4.3478260869565215) internal successors, (100), 24 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:52:12,989 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 373 transitions. [2021-11-23 01:52:12,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 01:52:12,990 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:52:12,990 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:52:13,001 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (59)] Forceful destruction successful, exit code 0 [2021-11-23 01:52:13,220 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Ended with exit code 0 [2021-11-23 01:52:13,402 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (60)] Ended with exit code 0 [2021-11-23 01:52:13,601 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 01:52:13,601 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:52:13,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:52:13,602 INFO L85 PathProgramCache]: Analyzing trace with hash -1409463453, now seen corresponding path program 3 times [2021-11-23 01:52:13,602 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:52:13,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [389576415] [2021-11-23 01:52:13,602 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:52:13,602 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:52:13,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:52:13,604 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:52:13,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (62)] Waiting until timeout for monitored process [2021-11-23 01:52:13,729 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 01:52:13,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:52:13,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 01:52:13,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:52:13,788 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 01:52:13,788 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 2 case distinctions, treesize of input 33 treesize of output 40 [2021-11-23 01:52:13,791 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 42 treesize of output 40 [2021-11-23 01:52:24,957 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 01:52:24,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:52:26,502 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 55 treesize of output 53 [2021-11-23 01:52:26,600 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 01:52:26,601 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:52:26,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [389576415] [2021-11-23 01:52:26,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [389576415] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:52:26,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2012454757] [2021-11-23 01:52:26,601 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:52:26,601 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:52:26,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:52:26,611 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:52:26,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (63)] Waiting until timeout for monitored process [2021-11-23 01:52:26,803 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 01:52:26,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:52:26,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 01:52:26,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:52:26,857 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 01:52:26,858 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 2 case distinctions, treesize of input 32 treesize of output 39 [2021-11-23 01:52:26,862 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 41 treesize of output 39 [2021-11-23 01:52:27,677 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 01:52:27,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:52:29,755 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 56 treesize of output 54 [2021-11-23 01:52:29,782 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 01:52:29,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2012454757] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:52:29,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1027682819] [2021-11-23 01:52:29,783 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:52:29,783 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:52:29,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:52:29,799 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:52:29,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-23 01:52:29,937 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 01:52:29,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:52:29,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 01:52:29,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:52:30,013 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 01:52:30,013 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 2 case distinctions, treesize of input 32 treesize of output 39 [2021-11-23 01:52:30,017 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 41 treesize of output 39 [2021-11-23 01:52:42,353 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:52:42,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:52:44,741 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:52:44,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1027682819] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:52:44,742 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:52:44,742 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 12, 11] total 37 [2021-11-23 01:52:44,742 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884819818] [2021-11-23 01:52:44,742 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:52:44,743 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-23 01:52:44,743 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:52:44,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-23 01:52:44,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=1097, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 01:52:44,744 INFO L87 Difference]: Start difference. First operand 299 states and 373 transitions. Second operand has 37 states, 37 states have (on average 3.3783783783783785) internal successors, (125), 37 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:52:51,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:52:51,159 INFO L93 Difference]: Finished difference Result 575 states and 725 transitions. [2021-11-23 01:52:51,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-23 01:52:51,160 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.3783783783783785) internal successors, (125), 37 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-23 01:52:51,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:52:51,163 INFO L225 Difference]: With dead ends: 575 [2021-11-23 01:52:51,163 INFO L226 Difference]: Without dead ends: 563 [2021-11-23 01:52:51,164 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 161 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 851 ImplicationChecksByTransitivity, 30.7s TimeCoverageRelationStatistics Valid=444, Invalid=2106, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 01:52:51,165 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 111 mSDsluCounter, 476 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 509 SdHoareTripleChecker+Invalid, 326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 174 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 01:52:51,165 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 509 Invalid, 326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 143 Invalid, 0 Unknown, 174 Unchecked, 1.3s Time] [2021-11-23 01:52:51,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 563 states. [2021-11-23 01:52:51,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 563 to 397. [2021-11-23 01:52:51,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 397 states, 392 states have (on average 1.3239795918367347) internal successors, (519), 396 states have internal predecessors, (519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:52:51,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 519 transitions. [2021-11-23 01:52:51,177 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 519 transitions. Word has length 33 [2021-11-23 01:52:51,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:52:51,177 INFO L470 AbstractCegarLoop]: Abstraction has 397 states and 519 transitions. [2021-11-23 01:52:51,177 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 3.3783783783783785) internal successors, (125), 37 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:52:51,178 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 519 transitions. [2021-11-23 01:52:51,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-23 01:52:51,179 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:52:51,179 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:52:51,213 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Ended with exit code 0 [2021-11-23 01:52:51,399 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (62)] Ended with exit code 0 [2021-11-23 01:52:51,593 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (63)] Forceful destruction successful, exit code 0 [2021-11-23 01:52:51,792 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 01:52:51,792 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:52:51,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:52:51,792 INFO L85 PathProgramCache]: Analyzing trace with hash -54518167, now seen corresponding path program 1 times [2021-11-23 01:52:51,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:52:51,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1432494365] [2021-11-23 01:52:51,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:52:51,793 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:52:51,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:52:51,795 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:52:51,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (65)] Waiting until timeout for monitored process [2021-11-23 01:52:51,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:52:51,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 01:52:51,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:52:52,134 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:52:52,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:52:52,783 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 27 treesize of output 23 [2021-11-23 01:52:53,093 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:52:53,094 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:52:53,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1432494365] [2021-11-23 01:52:53,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1432494365] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:52:53,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1200478772] [2021-11-23 01:52:53,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:52:53,094 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:52:53,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:52:53,095 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:52:53,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (66)] Waiting until timeout for monitored process [2021-11-23 01:52:53,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:52:53,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 01:52:53,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:52:53,461 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:52:53,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:52:53,854 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 27 treesize of output 23 [2021-11-23 01:52:53,947 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:52:53,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1200478772] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:52:53,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [515761634] [2021-11-23 01:52:53,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:52:53,947 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:52:53,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:52:53,948 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:52:53,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-23 01:52:54,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:52:54,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 01:52:54,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:52:54,205 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:52:54,205 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:52:54,596 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 27 treesize of output 23 [2021-11-23 01:52:54,680 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:52:54,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [515761634] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:52:54,680 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:52:54,680 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 11 [2021-11-23 01:52:54,680 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322799082] [2021-11-23 01:52:54,680 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:52:54,681 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 01:52:54,681 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:52:54,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 01:52:54,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-11-23 01:52:54,681 INFO L87 Difference]: Start difference. First operand 397 states and 519 transitions. Second operand has 12 states, 11 states have (on average 6.0) internal successors, (66), 12 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:52:56,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:52:56,705 INFO L93 Difference]: Finished difference Result 1249 states and 1678 transitions. [2021-11-23 01:52:56,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 01:52:56,706 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 6.0) internal successors, (66), 12 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-23 01:52:56,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:52:56,712 INFO L225 Difference]: With dead ends: 1249 [2021-11-23 01:52:56,712 INFO L226 Difference]: Without dead ends: 1249 [2021-11-23 01:52:56,713 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=148, Invalid=452, Unknown=0, NotChecked=0, Total=600 [2021-11-23 01:52:56,713 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 499 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 499 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 01:52:56,713 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [499 Valid, 236 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-23 01:52:56,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1249 states. [2021-11-23 01:52:56,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1249 to 367. [2021-11-23 01:52:56,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 362 states have (on average 1.3149171270718232) internal successors, (476), 366 states have internal predecessors, (476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:52:56,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 476 transitions. [2021-11-23 01:52:56,730 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 476 transitions. Word has length 35 [2021-11-23 01:52:56,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:52:56,730 INFO L470 AbstractCegarLoop]: Abstraction has 367 states and 476 transitions. [2021-11-23 01:52:56,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 6.0) internal successors, (66), 12 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:52:56,730 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 476 transitions. [2021-11-23 01:52:56,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-23 01:52:56,731 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:52:56,731 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1] [2021-11-23 01:52:56,756 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2021-11-23 01:52:56,945 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (66)] Forceful destruction successful, exit code 0 [2021-11-23 01:52:57,151 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (65)] Forceful destruction successful, exit code 0 [2021-11-23 01:52:57,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:52:57,344 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:52:57,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:52:57,344 INFO L85 PathProgramCache]: Analyzing trace with hash 1249695552, now seen corresponding path program 3 times [2021-11-23 01:52:57,345 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:52:57,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2066682997] [2021-11-23 01:52:57,345 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:52:57,345 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:52:57,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:52:57,346 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:52:57,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (68)] Waiting until timeout for monitored process [2021-11-23 01:52:57,472 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-23 01:52:57,472 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:52:57,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 01:52:57,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:52:57,547 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-23 01:52:57,548 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 2 case distinctions, treesize of input 43 treesize of output 46 [2021-11-23 01:52:57,554 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:52:57,554 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 49 treesize of output 45 [2021-11-23 01:53:00,481 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:53:00,481 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:53:02,711 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:53:02,711 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 79 treesize of output 75 [2021-11-23 01:53:02,841 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:53:02,842 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:53:02,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2066682997] [2021-11-23 01:53:02,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2066682997] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:53:02,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1668451464] [2021-11-23 01:53:02,842 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:53:02,842 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:53:02,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:53:02,843 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:53:02,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (69)] Waiting until timeout for monitored process [2021-11-23 01:53:03,188 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-23 01:53:03,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:53:03,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 01:53:03,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:53:03,351 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-23 01:53:03,351 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 2 case distinctions, treesize of input 41 treesize of output 44 [2021-11-23 01:53:03,357 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:53:03,357 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 47 treesize of output 43 [2021-11-23 01:53:06,828 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:53:06,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:53:14,337 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:53:14,337 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 183 treesize of output 179 [2021-11-23 01:53:14,621 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:53:14,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1668451464] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:53:14,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [491547266] [2021-11-23 01:53:14,621 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:53:14,621 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:53:14,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:53:14,622 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:53:14,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-23 01:53:16,298 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-23 01:53:16,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:53:16,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 01:53:16,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:53:16,355 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-23 01:53:16,356 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 2 case distinctions, treesize of input 42 treesize of output 45 [2021-11-23 01:53:16,361 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:53:16,362 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 48 treesize of output 44 [2021-11-23 01:53:19,408 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:53:19,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:53:24,933 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:53:24,934 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 183 treesize of output 179 [2021-11-23 01:53:24,981 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:53:24,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [491547266] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:53:24,982 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:53:24,982 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 15, 15, 14, 14] total 54 [2021-11-23 01:53:24,982 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803547983] [2021-11-23 01:53:24,983 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:53:24,983 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 01:53:24,983 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:53:24,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 01:53:24,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=819, Invalid=2151, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 01:53:24,985 INFO L87 Difference]: Start difference. First operand 367 states and 476 transitions. Second operand has 55 states, 54 states have (on average 2.962962962962963) internal successors, (160), 55 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:53:39,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:53:39,121 INFO L93 Difference]: Finished difference Result 431 states and 556 transitions. [2021-11-23 01:53:39,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-23 01:53:39,122 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 2.962962962962963) internal successors, (160), 55 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-23 01:53:39,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:53:39,123 INFO L225 Difference]: With dead ends: 431 [2021-11-23 01:53:39,124 INFO L226 Difference]: Without dead ends: 431 [2021-11-23 01:53:39,125 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 153 SyntacticMatches, 9 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2575 ImplicationChecksByTransitivity, 25.5s TimeCoverageRelationStatistics Valid=1629, Invalid=3921, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 01:53:39,125 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 67 mSDsluCounter, 450 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 495 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 68 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 01:53:39,126 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 495 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1 Invalid, 0 Unknown, 68 Unchecked, 0.0s Time] [2021-11-23 01:53:39,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 431 states. [2021-11-23 01:53:39,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 431 to 431. [2021-11-23 01:53:39,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 431 states, 426 states have (on average 1.3051643192488263) internal successors, (556), 430 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:53:39,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 556 transitions. [2021-11-23 01:53:39,136 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 556 transitions. Word has length 35 [2021-11-23 01:53:39,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:53:39,137 INFO L470 AbstractCegarLoop]: Abstraction has 431 states and 556 transitions. [2021-11-23 01:53:39,137 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 54 states have (on average 2.962962962962963) internal successors, (160), 55 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:53:39,137 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 556 transitions. [2021-11-23 01:53:39,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 01:53:39,138 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:53:39,138 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:53:39,149 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (69)] Forceful destruction successful, exit code 0 [2021-11-23 01:53:39,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (68)] Forceful destruction successful, exit code 0 [2021-11-23 01:53:39,572 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Ended with exit code 0 [2021-11-23 01:53:39,750 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:53:39,751 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:53:39,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:53:39,751 INFO L85 PathProgramCache]: Analyzing trace with hash -524293744, now seen corresponding path program 3 times [2021-11-23 01:53:39,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:53:39,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [763883532] [2021-11-23 01:53:39,751 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:53:39,751 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:53:39,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:53:39,753 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:53:39,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (71)] Waiting until timeout for monitored process [2021-11-23 01:53:39,945 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 01:53:39,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:53:39,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 01:53:39,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:53:40,018 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-23 01:53:40,018 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 2 case distinctions, treesize of input 41 treesize of output 44 [2021-11-23 01:53:40,024 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:53:40,024 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 47 treesize of output 43 [2021-11-23 01:53:43,001 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:53:43,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:53:46,751 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 24 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:53:46,752 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:53:46,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [763883532] [2021-11-23 01:53:46,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [763883532] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:53:46,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1138353766] [2021-11-23 01:53:46,752 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:53:46,752 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:53:46,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:53:46,753 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:53:46,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (72)] Waiting until timeout for monitored process [2021-11-23 01:53:47,122 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 01:53:47,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:53:47,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 01:53:47,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:53:47,195 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-23 01:53:47,195 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 2 case distinctions, treesize of input 43 treesize of output 46 [2021-11-23 01:53:47,202 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:53:47,203 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 49 treesize of output 45 [2021-11-23 01:53:49,425 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-23 01:53:49,426 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 48 treesize of output 38 [2021-11-23 01:53:49,599 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:53:49,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:53:52,062 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 7 proven. 18 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:53:52,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1138353766] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:53:52,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1391804105] [2021-11-23 01:53:52,062 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:53:52,062 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:53:52,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:53:52,063 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:53:52,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-23 01:53:52,204 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 01:53:52,204 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:53:52,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 01:53:52,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:53:52,966 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:53:52,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:53:53,749 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:53:53,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1391804105] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:53:53,749 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:53:53,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 12, 11, 11, 10] total 44 [2021-11-23 01:53:53,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765569261] [2021-11-23 01:53:53,749 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:53:53,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-23 01:53:53,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:53:53,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-23 01:53:53,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=1588, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 01:53:53,751 INFO L87 Difference]: Start difference. First operand 431 states and 556 transitions. Second operand has 44 states, 44 states have (on average 3.977272727272727) internal successors, (175), 44 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:53:55,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:53:55,489 INFO L93 Difference]: Finished difference Result 745 states and 974 transitions. [2021-11-23 01:53:55,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 01:53:55,490 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.977272727272727) internal successors, (175), 44 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-23 01:53:55,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:53:55,493 INFO L225 Difference]: With dead ends: 745 [2021-11-23 01:53:55,493 INFO L226 Difference]: Without dead ends: 739 [2021-11-23 01:53:55,494 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 192 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1031 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=397, Invalid=1955, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 01:53:55,495 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 163 mSDsluCounter, 571 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 608 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 01:53:55,495 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 608 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 99 Invalid, 0 Unknown, 43 Unchecked, 0.6s Time] [2021-11-23 01:53:55,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 739 states. [2021-11-23 01:53:55,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 739 to 689. [2021-11-23 01:53:55,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 689 states, 684 states have (on average 1.340643274853801) internal successors, (917), 688 states have internal predecessors, (917), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:53:55,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 689 states to 689 states and 917 transitions. [2021-11-23 01:53:55,511 INFO L78 Accepts]: Start accepts. Automaton has 689 states and 917 transitions. Word has length 40 [2021-11-23 01:53:55,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:53:55,511 INFO L470 AbstractCegarLoop]: Abstraction has 689 states and 917 transitions. [2021-11-23 01:53:55,511 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 3.977272727272727) internal successors, (175), 44 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:53:55,511 INFO L276 IsEmpty]: Start isEmpty. Operand 689 states and 917 transitions. [2021-11-23 01:53:55,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 01:53:55,513 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:53:55,513 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:53:55,530 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (71)] Forceful destruction successful, exit code 0 [2021-11-23 01:53:55,727 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (72)] Ended with exit code 0 [2021-11-23 01:53:55,946 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Ended with exit code 0 [2021-11-23 01:53:56,126 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:53:56,126 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:53:56,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:53:56,126 INFO L85 PathProgramCache]: Analyzing trace with hash -1396579989, now seen corresponding path program 3 times [2021-11-23 01:53:56,127 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:53:56,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2145350272] [2021-11-23 01:53:56,127 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:53:56,127 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:53:56,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:53:56,128 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:53:56,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (74)] Waiting until timeout for monitored process [2021-11-23 01:53:56,269 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-23 01:53:56,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:53:56,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 01:53:56,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:53:56,329 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 01:53:56,329 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 2 case distinctions, treesize of input 32 treesize of output 39 [2021-11-23 01:53:56,332 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 41 treesize of output 39 [2021-11-23 01:54:08,684 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:54:08,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:54:13,032 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 77 treesize of output 75 [2021-11-23 01:54:13,203 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:54:13,204 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:54:13,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2145350272] [2021-11-23 01:54:13,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2145350272] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:54:13,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1343169637] [2021-11-23 01:54:13,204 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:54:13,204 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:54:13,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:54:13,205 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:54:13,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (75)] Waiting until timeout for monitored process [2021-11-23 01:54:13,628 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-23 01:54:13,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:54:13,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 01:54:13,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:54:13,698 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 01:54:13,698 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 2 case distinctions, treesize of input 33 treesize of output 40 [2021-11-23 01:54:13,701 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 42 treesize of output 40 [2021-11-23 01:54:16,944 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:54:16,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:54:25,212 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 78 treesize of output 76 [2021-11-23 01:54:25,239 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:54:25,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1343169637] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:54:25,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1792487532] [2021-11-23 01:54:25,239 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:54:25,240 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:54:25,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:54:25,241 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:54:25,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-23 01:54:27,542 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-23 01:54:27,542 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:54:27,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 01:54:27,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:54:27,598 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 01:54:27,599 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 2 case distinctions, treesize of input 32 treesize of output 39 [2021-11-23 01:54:27,602 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 41 treesize of output 39 [2021-11-23 01:54:30,582 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:54:30,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:54:34,261 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 55 treesize of output 53 [2021-11-23 01:54:34,281 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:54:34,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1792487532] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:54:34,281 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:54:34,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 16, 16, 13, 13] total 48 [2021-11-23 01:54:34,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314660043] [2021-11-23 01:54:34,282 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:54:34,283 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-23 01:54:34,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:54:34,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-23 01:54:34,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=1751, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 01:54:34,284 INFO L87 Difference]: Start difference. First operand 689 states and 917 transitions. Second operand has 49 states, 48 states have (on average 3.2291666666666665) internal successors, (155), 49 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:55:07,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:55:07,300 INFO L93 Difference]: Finished difference Result 817 states and 1077 transitions. [2021-11-23 01:55:07,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-23 01:55:07,301 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 3.2291666666666665) internal successors, (155), 49 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-23 01:55:07,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:55:07,304 INFO L225 Difference]: With dead ends: 817 [2021-11-23 01:55:07,304 INFO L226 Difference]: Without dead ends: 817 [2021-11-23 01:55:07,305 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 197 SyntacticMatches, 6 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1932 ImplicationChecksByTransitivity, 56.4s TimeCoverageRelationStatistics Valid=1430, Invalid=3826, Unknown=0, NotChecked=0, Total=5256 [2021-11-23 01:55:07,306 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 102 mSDsluCounter, 370 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 406 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 45 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-23 01:55:07,306 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 406 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 209 Invalid, 0 Unknown, 45 Unchecked, 2.2s Time] [2021-11-23 01:55:07,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 817 states. [2021-11-23 01:55:07,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 817 to 817. [2021-11-23 01:55:07,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 817 states, 812 states have (on average 1.3263546798029557) internal successors, (1077), 816 states have internal predecessors, (1077), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:55:07,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 817 states to 817 states and 1077 transitions. [2021-11-23 01:55:07,323 INFO L78 Accepts]: Start accepts. Automaton has 817 states and 1077 transitions. Word has length 41 [2021-11-23 01:55:07,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:55:07,324 INFO L470 AbstractCegarLoop]: Abstraction has 817 states and 1077 transitions. [2021-11-23 01:55:07,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 3.2291666666666665) internal successors, (155), 49 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:55:07,324 INFO L276 IsEmpty]: Start isEmpty. Operand 817 states and 1077 transitions. [2021-11-23 01:55:07,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 01:55:07,326 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:55:07,326 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:55:07,351 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (74)] Ended with exit code 0 [2021-11-23 01:55:07,539 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (75)] Ended with exit code 0 [2021-11-23 01:55:07,759 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Ended with exit code 0 [2021-11-23 01:55:07,938 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:55:07,938 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:55:07,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:55:07,938 INFO L85 PathProgramCache]: Analyzing trace with hash 829184327, now seen corresponding path program 1 times [2021-11-23 01:55:07,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:55:07,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1184850117] [2021-11-23 01:55:07,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:55:07,939 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:55:07,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:55:07,939 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:55:07,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (77)] Waiting until timeout for monitored process [2021-11-23 01:55:08,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:55:08,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 01:55:08,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:55:08,162 INFO L354 Elim1Store]: treesize reduction 42, result has 35.4 percent of original size [2021-11-23 01:55:08,163 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 2 case distinctions, treesize of input 18 treesize of output 30 [2021-11-23 01:55:08,737 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:08,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:55:09,838 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:09,839 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:55:09,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1184850117] [2021-11-23 01:55:09,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1184850117] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:55:09,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1100194800] [2021-11-23 01:55:09,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:55:09,839 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:55:09,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:55:09,841 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:55:09,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (78)] Waiting until timeout for monitored process [2021-11-23 01:55:10,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:55:10,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 01:55:10,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:55:10,071 INFO L354 Elim1Store]: treesize reduction 42, result has 35.4 percent of original size [2021-11-23 01:55:10,071 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 2 case distinctions, treesize of input 18 treesize of output 30 [2021-11-23 01:55:10,779 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:10,779 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:55:11,977 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:11,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1100194800] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:55:11,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874439432] [2021-11-23 01:55:11,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:55:11,977 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:55:11,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:55:11,978 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:55:11,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2021-11-23 01:55:12,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:55:12,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 01:55:12,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:55:12,191 INFO L354 Elim1Store]: treesize reduction 42, result has 35.4 percent of original size [2021-11-23 01:55:12,192 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 2 case distinctions, treesize of input 18 treesize of output 30 [2021-11-23 01:55:12,748 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:12,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:55:13,394 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:13,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1874439432] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:55:13,394 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:55:13,394 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9, 8, 7, 7] total 25 [2021-11-23 01:55:13,395 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945271726] [2021-11-23 01:55:13,395 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:55:13,395 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 01:55:13,395 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:55:13,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 01:55:13,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=517, Unknown=0, NotChecked=0, Total=650 [2021-11-23 01:55:13,396 INFO L87 Difference]: Start difference. First operand 817 states and 1077 transitions. Second operand has 26 states, 25 states have (on average 5.28) internal successors, (132), 26 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:55:14,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:55:14,571 INFO L93 Difference]: Finished difference Result 1275 states and 1691 transitions. [2021-11-23 01:55:14,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 01:55:14,572 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 5.28) internal successors, (132), 26 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-23 01:55:14,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:55:14,577 INFO L225 Difference]: With dead ends: 1275 [2021-11-23 01:55:14,577 INFO L226 Difference]: Without dead ends: 1275 [2021-11-23 01:55:14,577 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 221 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=208, Invalid=722, Unknown=0, NotChecked=0, Total=930 [2021-11-23 01:55:14,578 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 315 mSDsluCounter, 357 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 315 SdHoareTripleChecker+Valid, 397 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 83 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 01:55:14,578 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [315 Valid, 397 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 157 Invalid, 0 Unknown, 83 Unchecked, 0.7s Time] [2021-11-23 01:55:14,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1275 states. [2021-11-23 01:55:14,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1275 to 875. [2021-11-23 01:55:14,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 875 states, 870 states have (on average 1.332183908045977) internal successors, (1159), 874 states have internal predecessors, (1159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:55:14,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 875 states to 875 states and 1159 transitions. [2021-11-23 01:55:14,599 INFO L78 Accepts]: Start accepts. Automaton has 875 states and 1159 transitions. Word has length 41 [2021-11-23 01:55:14,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:55:14,599 INFO L470 AbstractCegarLoop]: Abstraction has 875 states and 1159 transitions. [2021-11-23 01:55:14,600 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 5.28) internal successors, (132), 26 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:55:14,600 INFO L276 IsEmpty]: Start isEmpty. Operand 875 states and 1159 transitions. [2021-11-23 01:55:14,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 01:55:14,601 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:55:14,601 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:55:14,637 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Forceful destruction successful, exit code 0 [2021-11-23 01:55:14,817 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (78)] Ended with exit code 0 [2021-11-23 01:55:15,023 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (77)] Ended with exit code 0 [2021-11-23 01:55:15,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:55:15,216 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:55:15,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:55:15,216 INFO L85 PathProgramCache]: Analyzing trace with hash 510761222, now seen corresponding path program 1 times [2021-11-23 01:55:15,216 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:55:15,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1936204366] [2021-11-23 01:55:15,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:55:15,217 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:55:15,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:55:15,218 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:55:15,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (80)] Waiting until timeout for monitored process [2021-11-23 01:55:15,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:55:15,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 01:55:15,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:55:15,651 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:15,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:55:16,056 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:16,056 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:55:16,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1936204366] [2021-11-23 01:55:16,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1936204366] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:55:16,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [571094999] [2021-11-23 01:55:16,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:55:16,057 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:55:16,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:55:16,058 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:55:16,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (81)] Waiting until timeout for monitored process [2021-11-23 01:55:16,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:55:16,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 01:55:16,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:55:16,491 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:16,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:55:16,664 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:16,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [571094999] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:55:16,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1492649024] [2021-11-23 01:55:16,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:55:16,664 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:55:16,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:55:16,665 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:55:16,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-23 01:55:16,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:55:16,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 01:55:16,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:55:17,028 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:17,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:55:17,212 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:17,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1492649024] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:55:17,212 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:55:17,212 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 11, 10, 11, 10] total 19 [2021-11-23 01:55:17,212 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648651748] [2021-11-23 01:55:17,212 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:55:17,213 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-23 01:55:17,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:55:17,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-23 01:55:17,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2021-11-23 01:55:17,214 INFO L87 Difference]: Start difference. First operand 875 states and 1159 transitions. Second operand has 19 states, 19 states have (on average 4.315789473684211) internal successors, (82), 19 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:55:17,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:55:17,852 INFO L93 Difference]: Finished difference Result 972 states and 1266 transitions. [2021-11-23 01:55:17,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 01:55:17,853 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 4.315789473684211) internal successors, (82), 19 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-23 01:55:17,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:55:17,856 INFO L225 Difference]: With dead ends: 972 [2021-11-23 01:55:17,856 INFO L226 Difference]: Without dead ends: 899 [2021-11-23 01:55:17,857 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 234 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=197, Invalid=615, Unknown=0, NotChecked=0, Total=812 [2021-11-23 01:55:17,857 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 263 mSDsluCounter, 375 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 263 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 01:55:17,857 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [263 Valid, 425 Invalid, 253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 224 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 01:55:17,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 899 states. [2021-11-23 01:55:17,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 899 to 835. [2021-11-23 01:55:17,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 835 states, 830 states have (on average 1.3253012048192772) internal successors, (1100), 834 states have internal predecessors, (1100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:55:17,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 835 states to 835 states and 1100 transitions. [2021-11-23 01:55:17,874 INFO L78 Accepts]: Start accepts. Automaton has 835 states and 1100 transitions. Word has length 43 [2021-11-23 01:55:17,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:55:17,874 INFO L470 AbstractCegarLoop]: Abstraction has 835 states and 1100 transitions. [2021-11-23 01:55:17,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 4.315789473684211) internal successors, (82), 19 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:55:17,875 INFO L276 IsEmpty]: Start isEmpty. Operand 835 states and 1100 transitions. [2021-11-23 01:55:17,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 01:55:17,876 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:55:17,876 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:55:17,891 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (81)] Forceful destruction successful, exit code 0 [2021-11-23 01:55:18,098 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Ended with exit code 0 [2021-11-23 01:55:18,286 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (80)] Forceful destruction successful, exit code 0 [2021-11-23 01:55:18,478 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:55:18,478 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:55:18,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:55:18,479 INFO L85 PathProgramCache]: Analyzing trace with hash -2013885157, now seen corresponding path program 1 times [2021-11-23 01:55:18,479 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:55:18,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [122439556] [2021-11-23 01:55:18,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:55:18,479 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:55:18,480 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:55:18,480 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:55:18,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (83)] Waiting until timeout for monitored process [2021-11-23 01:55:18,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:55:18,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 01:55:18,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:55:18,833 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 9 proven. 9 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 01:55:18,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:55:19,393 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 27 treesize of output 23 [2021-11-23 01:55:19,766 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 01:55:19,766 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:55:19,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [122439556] [2021-11-23 01:55:19,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [122439556] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:55:19,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [27903193] [2021-11-23 01:55:19,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:55:19,767 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:55:19,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:55:19,767 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:55:19,769 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (84)] Waiting until timeout for monitored process [2021-11-23 01:55:19,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:55:19,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 01:55:19,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:55:20,449 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 10 proven. 7 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 01:55:20,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:55:21,127 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 10 proven. 7 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 01:55:21,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [27903193] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:55:21,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995998200] [2021-11-23 01:55:21,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:55:21,127 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:55:21,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:55:21,128 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:55:21,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-23 01:55:21,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:55:21,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 01:55:21,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:55:21,693 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 01:55:21,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:55:22,176 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 01:55:22,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995998200] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:55:22,177 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:55:22,177 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 12, 11, 9, 7] total 45 [2021-11-23 01:55:22,177 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757994013] [2021-11-23 01:55:22,177 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:55:22,177 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-23 01:55:22,177 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:55:22,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-23 01:55:22,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=1803, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 01:55:22,179 INFO L87 Difference]: Start difference. First operand 835 states and 1100 transitions. Second operand has 45 states, 45 states have (on average 4.044444444444444) internal successors, (182), 45 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:55:30,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:55:30,557 INFO L93 Difference]: Finished difference Result 1702 states and 2021 transitions. [2021-11-23 01:55:30,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-23 01:55:30,558 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 4.044444444444444) internal successors, (182), 45 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-23 01:55:30,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:55:30,566 INFO L225 Difference]: With dead ends: 1702 [2021-11-23 01:55:30,566 INFO L226 Difference]: Without dead ends: 1634 [2021-11-23 01:55:30,570 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2236 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=1504, Invalid=7808, Unknown=0, NotChecked=0, Total=9312 [2021-11-23 01:55:30,570 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 1388 mSDsluCounter, 745 mSDsCounter, 0 mSdLazyCounter, 1256 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1388 SdHoareTripleChecker+Valid, 790 SdHoareTripleChecker+Invalid, 1413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 1256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 01:55:30,571 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1388 Valid, 790 Invalid, 1413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 1256 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 01:55:30,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1634 states. [2021-11-23 01:55:30,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1634 to 820. [2021-11-23 01:55:30,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 820 states, 815 states have (on average 1.2257668711656442) internal successors, (999), 819 states have internal predecessors, (999), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:55:30,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 820 states to 820 states and 999 transitions. [2021-11-23 01:55:30,592 INFO L78 Accepts]: Start accepts. Automaton has 820 states and 999 transitions. Word has length 44 [2021-11-23 01:55:30,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:55:30,593 INFO L470 AbstractCegarLoop]: Abstraction has 820 states and 999 transitions. [2021-11-23 01:55:30,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 4.044444444444444) internal successors, (182), 45 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:55:30,593 INFO L276 IsEmpty]: Start isEmpty. Operand 820 states and 999 transitions. [2021-11-23 01:55:30,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 01:55:30,595 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:55:30,595 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:55:30,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Forceful destruction successful, exit code 0 [2021-11-23 01:55:30,815 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (83)] Ended with exit code 0 [2021-11-23 01:55:31,009 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (84)] Forceful destruction successful, exit code 0 [2021-11-23 01:55:31,208 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 01:55:31,208 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:55:31,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:55:31,208 INFO L85 PathProgramCache]: Analyzing trace with hash 1937706185, now seen corresponding path program 2 times [2021-11-23 01:55:31,208 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:55:31,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [518181907] [2021-11-23 01:55:31,209 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:55:31,209 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:55:31,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:55:31,210 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:55:31,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (86)] Waiting until timeout for monitored process [2021-11-23 01:55:31,312 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:55:31,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:55:31,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 01:55:31,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:55:31,665 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:31,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:55:33,041 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 35 treesize of output 29 [2021-11-23 01:55:33,561 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:55:33,561 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:55:33,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [518181907] [2021-11-23 01:55:33,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [518181907] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:55:33,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1492932781] [2021-11-23 01:55:33,561 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:55:33,561 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:55:33,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:55:33,562 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:55:33,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (87)] Waiting until timeout for monitored process [2021-11-23 01:55:33,723 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:55:33,723 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:55:33,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 01:55:33,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:55:33,835 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-23 01:55:33,839 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 2 case distinctions, treesize of input 41 treesize of output 44 [2021-11-23 01:55:33,847 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:55:33,847 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 47 treesize of output 43 [2021-11-23 01:55:38,547 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:38,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:55:41,223 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:55:41,223 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 77 treesize of output 1 [2021-11-23 01:55:41,231 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:41,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1492932781] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:55:41,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [924103423] [2021-11-23 01:55:41,231 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:55:41,231 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:55:41,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:55:41,232 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:55:41,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-23 01:55:41,304 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:55:41,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:55:41,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 01:55:41,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:55:41,680 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:41,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:55:42,514 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 35 treesize of output 29 [2021-11-23 01:55:42,647 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:55:42,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [924103423] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:55:42,648 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:55:42,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 12, 11, 8, 9] total 35 [2021-11-23 01:55:42,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [622426390] [2021-11-23 01:55:42,648 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:55:42,648 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-23 01:55:42,649 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:55:42,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-23 01:55:42,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1077, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 01:55:42,650 INFO L87 Difference]: Start difference. First operand 820 states and 999 transitions. Second operand has 36 states, 35 states have (on average 4.857142857142857) internal successors, (170), 36 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:55:52,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:55:52,646 INFO L93 Difference]: Finished difference Result 1663 states and 1988 transitions. [2021-11-23 01:55:52,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-23 01:55:52,648 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 4.857142857142857) internal successors, (170), 36 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-23 01:55:52,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:55:52,655 INFO L225 Difference]: With dead ends: 1663 [2021-11-23 01:55:52,655 INFO L226 Difference]: Without dead ends: 1663 [2021-11-23 01:55:52,656 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 245 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 691 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=355, Invalid=2297, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 01:55:52,657 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 195 mSDsluCounter, 952 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 1007 SdHoareTripleChecker+Invalid, 607 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 258 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-23 01:55:52,657 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [195 Valid, 1007 Invalid, 607 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 345 Invalid, 0 Unknown, 258 Unchecked, 2.2s Time] [2021-11-23 01:55:52,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1663 states. [2021-11-23 01:55:52,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1663 to 1286. [2021-11-23 01:55:52,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1286 states, 1281 states have (on average 1.2177985948477752) internal successors, (1560), 1285 states have internal predecessors, (1560), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:55:52,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1286 states to 1286 states and 1560 transitions. [2021-11-23 01:55:52,685 INFO L78 Accepts]: Start accepts. Automaton has 1286 states and 1560 transitions. Word has length 47 [2021-11-23 01:55:52,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:55:52,685 INFO L470 AbstractCegarLoop]: Abstraction has 1286 states and 1560 transitions. [2021-11-23 01:55:52,686 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 4.857142857142857) internal successors, (170), 36 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:55:52,686 INFO L276 IsEmpty]: Start isEmpty. Operand 1286 states and 1560 transitions. [2021-11-23 01:55:52,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 01:55:52,688 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:55:52,688 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:55:52,708 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (86)] Ended with exit code 0 [2021-11-23 01:55:52,924 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Forceful destruction successful, exit code 0 [2021-11-23 01:55:53,104 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (87)] Forceful destruction successful, exit code 0 [2021-11-23 01:55:53,304 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 01:55:53,304 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:55:53,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:55:53,305 INFO L85 PathProgramCache]: Analyzing trace with hash 420978799, now seen corresponding path program 3 times [2021-11-23 01:55:53,305 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:55:53,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [910221315] [2021-11-23 01:55:53,305 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:55:53,305 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:55:53,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:55:53,306 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:55:53,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (89)] Waiting until timeout for monitored process [2021-11-23 01:55:53,557 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 01:55:53,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:55:53,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 01:55:53,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:55:53,924 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:53,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:55:55,228 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 35 treesize of output 29 [2021-11-23 01:55:55,801 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:55:55,801 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:55:55,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [910221315] [2021-11-23 01:55:55,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [910221315] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:55:55,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1983365115] [2021-11-23 01:55:55,802 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:55:55,802 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:55:55,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:55:55,802 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:55:55,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (90)] Waiting until timeout for monitored process [2021-11-23 01:55:56,539 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 01:55:56,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:55:56,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 01:55:56,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:55:56,720 INFO L354 Elim1Store]: treesize reduction 48, result has 21.3 percent of original size [2021-11-23 01:55:56,720 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 2 case distinctions, treesize of input 38 treesize of output 41 [2021-11-23 01:55:56,726 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:55:56,726 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 44 treesize of output 40 [2021-11-23 01:55:59,609 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:55:59,609 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:56:05,940 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:56:05,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1983365115] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:56:05,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2062070082] [2021-11-23 01:56:05,941 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 01:56:05,941 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:56:05,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:56:05,941 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:56:05,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-23 01:56:06,312 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 01:56:06,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:56:06,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 01:56:06,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:56:06,594 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:56:06,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:56:07,393 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 35 treesize of output 29 [2021-11-23 01:56:07,544 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:56:07,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2062070082] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:56:07,545 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:56:07,545 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 12, 12, 8, 9] total 36 [2021-11-23 01:56:07,545 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345991558] [2021-11-23 01:56:07,545 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:56:07,546 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-23 01:56:07,546 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:56:07,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-23 01:56:07,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=1125, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 01:56:07,547 INFO L87 Difference]: Start difference. First operand 1286 states and 1560 transitions. Second operand has 37 states, 36 states have (on average 4.805555555555555) internal successors, (173), 37 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:56:25,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:56:25,718 INFO L93 Difference]: Finished difference Result 2083 states and 2473 transitions. [2021-11-23 01:56:25,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-23 01:56:25,720 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 4.805555555555555) internal successors, (173), 37 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-23 01:56:25,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:56:25,728 INFO L225 Difference]: With dead ends: 2083 [2021-11-23 01:56:25,728 INFO L226 Difference]: Without dead ends: 2083 [2021-11-23 01:56:25,729 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 244 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1255 ImplicationChecksByTransitivity, 20.7s TimeCoverageRelationStatistics Valid=791, Invalid=3901, Unknown=0, NotChecked=0, Total=4692 [2021-11-23 01:56:25,730 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 550 mSDsluCounter, 865 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 550 SdHoareTripleChecker+Valid, 936 SdHoareTripleChecker+Invalid, 609 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 115 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2021-11-23 01:56:25,730 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [550 Valid, 936 Invalid, 609 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 465 Invalid, 0 Unknown, 115 Unchecked, 3.6s Time] [2021-11-23 01:56:25,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2083 states. [2021-11-23 01:56:25,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2083 to 1356. [2021-11-23 01:56:25,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1356 states, 1351 states have (on average 1.2168763878608437) internal successors, (1644), 1355 states have internal predecessors, (1644), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:56:25,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1356 states to 1356 states and 1644 transitions. [2021-11-23 01:56:25,763 INFO L78 Accepts]: Start accepts. Automaton has 1356 states and 1644 transitions. Word has length 47 [2021-11-23 01:56:25,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:56:25,763 INFO L470 AbstractCegarLoop]: Abstraction has 1356 states and 1644 transitions. [2021-11-23 01:56:25,763 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 4.805555555555555) internal successors, (173), 37 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:56:25,764 INFO L276 IsEmpty]: Start isEmpty. Operand 1356 states and 1644 transitions. [2021-11-23 01:56:25,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 01:56:25,765 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:56:25,766 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:56:25,802 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Forceful destruction successful, exit code 0 [2021-11-23 01:56:25,996 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (89)] Ended with exit code 0 [2021-11-23 01:56:26,190 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (90)] Ended with exit code 0 [2021-11-23 01:56:26,388 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 01:56:26,388 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:56:26,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:56:26,388 INFO L85 PathProgramCache]: Analyzing trace with hash -240796018, now seen corresponding path program 4 times [2021-11-23 01:56:26,389 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:56:26,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [745543041] [2021-11-23 01:56:26,389 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 01:56:26,389 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:56:26,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:56:26,390 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:56:26,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (92)] Waiting until timeout for monitored process [2021-11-23 01:56:26,485 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 01:56:26,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:56:26,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 01:56:26,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:56:26,823 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 25 proven. 43 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:56:26,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:56:27,339 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 25 proven. 43 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:56:27,339 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:56:27,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [745543041] [2021-11-23 01:56:27,339 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [745543041] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:56:27,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1511771589] [2021-11-23 01:56:27,339 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 01:56:27,340 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:56:27,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:56:27,340 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:56:27,342 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (93)] Waiting until timeout for monitored process [2021-11-23 01:56:27,481 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 01:56:27,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:56:27,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 01:56:27,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:56:27,664 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 32 proven. 30 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 01:56:27,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:56:28,046 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 32 proven. 30 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 01:56:28,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1511771589] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:56:28,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601263418] [2021-11-23 01:56:28,046 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 01:56:28,046 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:56:28,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:56:28,047 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:56:28,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2021-11-23 01:56:28,131 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 01:56:28,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:56:28,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 01:56:28,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:56:28,318 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 32 proven. 30 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 01:56:28,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:56:28,466 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 32 proven. 30 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 01:56:28,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [601263418] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:56:28,466 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:56:28,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13, 12, 13, 12] total 31 [2021-11-23 01:56:28,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625181091] [2021-11-23 01:56:28,466 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:56:28,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-23 01:56:28,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:56:28,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-23 01:56:28,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=779, Unknown=0, NotChecked=0, Total=930 [2021-11-23 01:56:28,468 INFO L87 Difference]: Start difference. First operand 1356 states and 1644 transitions. Second operand has 31 states, 31 states have (on average 3.3870967741935485) internal successors, (105), 31 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:56:30,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:56:30,963 INFO L93 Difference]: Finished difference Result 2806 states and 3335 transitions. [2021-11-23 01:56:30,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-23 01:56:30,965 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.3870967741935485) internal successors, (105), 31 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-23 01:56:30,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:56:30,975 INFO L225 Difference]: With dead ends: 2806 [2021-11-23 01:56:30,975 INFO L226 Difference]: Without dead ends: 2760 [2021-11-23 01:56:30,983 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 259 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 716 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=766, Invalid=2656, Unknown=0, NotChecked=0, Total=3422 [2021-11-23 01:56:30,983 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 886 mSDsluCounter, 1157 mSDsCounter, 0 mSdLazyCounter, 881 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 886 SdHoareTripleChecker+Valid, 1243 SdHoareTripleChecker+Invalid, 967 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 881 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 01:56:30,984 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [886 Valid, 1243 Invalid, 967 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 881 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-23 01:56:30,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2760 states. [2021-11-23 01:56:31,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2760 to 2220. [2021-11-23 01:56:31,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2220 states, 2215 states have (on average 1.2410835214446954) internal successors, (2749), 2219 states have internal predecessors, (2749), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:56:31,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2220 states to 2220 states and 2749 transitions. [2021-11-23 01:56:31,019 INFO L78 Accepts]: Start accepts. Automaton has 2220 states and 2749 transitions. Word has length 49 [2021-11-23 01:56:31,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:56:31,020 INFO L470 AbstractCegarLoop]: Abstraction has 2220 states and 2749 transitions. [2021-11-23 01:56:31,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 3.3870967741935485) internal successors, (105), 31 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:56:31,020 INFO L276 IsEmpty]: Start isEmpty. Operand 2220 states and 2749 transitions. [2021-11-23 01:56:31,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 01:56:31,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:56:31,022 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:56:31,035 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (92)] Ended with exit code 0 [2021-11-23 01:56:31,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Forceful destruction successful, exit code 0 [2021-11-23 01:56:31,436 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (93)] Forceful destruction successful, exit code 0 [2021-11-23 01:56:31,635 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 01:56:31,635 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:56:31,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:56:31,636 INFO L85 PathProgramCache]: Analyzing trace with hash -722595117, now seen corresponding path program 2 times [2021-11-23 01:56:31,636 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:56:31,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1171921530] [2021-11-23 01:56:31,636 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:56:31,636 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:56:31,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:56:31,637 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:56:31,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (95)] Waiting until timeout for monitored process [2021-11-23 01:56:31,753 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:56:31,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:56:31,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 01:56:31,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:56:31,814 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-23 01:56:31,814 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 2 case distinctions, treesize of input 45 treesize of output 48 [2021-11-23 01:56:31,819 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:56:31,820 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 51 treesize of output 47 [2021-11-23 01:56:36,444 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:56:36,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:56:38,918 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 29 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:56:38,918 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:56:38,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1171921530] [2021-11-23 01:56:38,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1171921530] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:56:38,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [844528578] [2021-11-23 01:56:38,919 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:56:38,919 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:56:38,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:56:38,919 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:56:38,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (96)] Waiting until timeout for monitored process [2021-11-23 01:56:39,093 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:56:39,093 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:56:39,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 01:56:39,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:56:39,249 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-23 01:56:39,249 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 2 case distinctions, treesize of input 43 treesize of output 46 [2021-11-23 01:56:39,255 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:56:39,256 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 49 treesize of output 45 [2021-11-23 01:56:44,159 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:56:44,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:56:47,106 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:56:47,107 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 74 treesize of output 1 [2021-11-23 01:56:47,114 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:56:47,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [844528578] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:56:47,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104920435] [2021-11-23 01:56:47,114 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:56:47,114 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:56:47,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:56:47,115 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:56:47,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2021-11-23 01:56:47,200 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:56:47,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:56:47,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 01:56:47,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:56:48,122 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 01:56:48,122 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:56:48,941 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 35 treesize of output 29 [2021-11-23 01:56:50,225 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 1 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:56:50,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [104920435] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:56:50,225 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:56:50,226 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 12, 11, 8, 9] total 46 [2021-11-23 01:56:50,226 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600236470] [2021-11-23 01:56:50,226 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:56:50,226 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-23 01:56:50,226 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:56:50,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-23 01:56:50,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=1863, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 01:56:50,228 INFO L87 Difference]: Start difference. First operand 2220 states and 2749 transitions. Second operand has 47 states, 46 states have (on average 5.173913043478261) internal successors, (238), 47 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:56:59,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:56:59,459 INFO L93 Difference]: Finished difference Result 3227 states and 3948 transitions. [2021-11-23 01:56:59,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 01:56:59,460 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 5.173913043478261) internal successors, (238), 47 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-23 01:56:59,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:56:59,471 INFO L225 Difference]: With dead ends: 3227 [2021-11-23 01:56:59,472 INFO L226 Difference]: Without dead ends: 3227 [2021-11-23 01:56:59,472 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 251 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1019 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=461, Invalid=2731, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 01:56:59,472 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 168 mSDsluCounter, 664 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 700 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 61 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 01:56:59,472 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [168 Valid, 700 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 193 Invalid, 0 Unknown, 61 Unchecked, 1.3s Time] [2021-11-23 01:56:59,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3227 states. [2021-11-23 01:56:59,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3227 to 2139. [2021-11-23 01:56:59,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2139 states, 2134 states have (on average 1.2282099343955013) internal successors, (2621), 2138 states have internal predecessors, (2621), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:56:59,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2139 states to 2139 states and 2621 transitions. [2021-11-23 01:56:59,501 INFO L78 Accepts]: Start accepts. Automaton has 2139 states and 2621 transitions. Word has length 50 [2021-11-23 01:56:59,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:56:59,501 INFO L470 AbstractCegarLoop]: Abstraction has 2139 states and 2621 transitions. [2021-11-23 01:56:59,501 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 5.173913043478261) internal successors, (238), 47 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:56:59,502 INFO L276 IsEmpty]: Start isEmpty. Operand 2139 states and 2621 transitions. [2021-11-23 01:56:59,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 01:56:59,503 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:56:59,504 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:56:59,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (95)] Forceful destruction successful, exit code 0 [2021-11-23 01:56:59,737 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Ended with exit code 0 [2021-11-23 01:56:59,918 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (96)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:00,116 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 01:57:00,117 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:57:00,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:00,117 INFO L85 PathProgramCache]: Analyzing trace with hash -1022969014, now seen corresponding path program 4 times [2021-11-23 01:57:00,117 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:57:00,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2063004107] [2021-11-23 01:57:00,118 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 01:57:00,118 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:57:00,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:57:00,118 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:57:00,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (98)] Waiting until timeout for monitored process [2021-11-23 01:57:00,233 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 01:57:00,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:00,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 01:57:00,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:00,693 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:00,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:01,322 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:01,322 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:57:01,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2063004107] [2021-11-23 01:57:01,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2063004107] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:01,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1256491663] [2021-11-23 01:57:01,323 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 01:57:01,323 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:57:01,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:57:01,328 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:57:01,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (99)] Waiting until timeout for monitored process [2021-11-23 01:57:01,465 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 01:57:01,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:01,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 01:57:01,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:01,985 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:01,985 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:02,315 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:02,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1256491663] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:02,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1125980875] [2021-11-23 01:57:02,315 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 01:57:02,315 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:02,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:02,316 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:02,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2021-11-23 01:57:02,387 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 01:57:02,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:02,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 01:57:02,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:02,709 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:02,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:02,968 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:02,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1125980875] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:02,969 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:57:02,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 12, 11, 13, 12] total 33 [2021-11-23 01:57:02,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671812883] [2021-11-23 01:57:02,969 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:02,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-23 01:57:02,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:57:02,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-23 01:57:02,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=899, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 01:57:02,970 INFO L87 Difference]: Start difference. First operand 2139 states and 2621 transitions. Second operand has 33 states, 33 states have (on average 4.606060606060606) internal successors, (152), 33 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:04,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:04,171 INFO L93 Difference]: Finished difference Result 2067 states and 2479 transitions. [2021-11-23 01:57:04,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 01:57:04,172 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 4.606060606060606) internal successors, (152), 33 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-23 01:57:04,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:04,178 INFO L225 Difference]: With dead ends: 2067 [2021-11-23 01:57:04,179 INFO L226 Difference]: Without dead ends: 1839 [2021-11-23 01:57:04,179 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 274 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 492 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=390, Invalid=1680, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 01:57:04,179 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 645 mSDsluCounter, 1075 mSDsCounter, 0 mSdLazyCounter, 578 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 645 SdHoareTripleChecker+Valid, 1156 SdHoareTripleChecker+Invalid, 634 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 578 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:04,180 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [645 Valid, 1156 Invalid, 634 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 578 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 01:57:04,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1839 states. [2021-11-23 01:57:04,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1839 to 1593. [2021-11-23 01:57:04,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1593 states, 1588 states have (on average 1.214735516372796) internal successors, (1929), 1592 states have internal predecessors, (1929), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:04,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1593 states to 1593 states and 1929 transitions. [2021-11-23 01:57:04,200 INFO L78 Accepts]: Start accepts. Automaton has 1593 states and 1929 transitions. Word has length 52 [2021-11-23 01:57:04,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:04,200 INFO L470 AbstractCegarLoop]: Abstraction has 1593 states and 1929 transitions. [2021-11-23 01:57:04,200 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 4.606060606060606) internal successors, (152), 33 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:04,201 INFO L276 IsEmpty]: Start isEmpty. Operand 1593 states and 1929 transitions. [2021-11-23 01:57:04,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 01:57:04,202 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:04,203 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:04,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (99)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:04,425 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Ended with exit code 0 [2021-11-23 01:57:04,613 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (98)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:04,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:57:04,805 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:57:04,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:04,805 INFO L85 PathProgramCache]: Analyzing trace with hash -958451034, now seen corresponding path program 1 times [2021-11-23 01:57:04,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:57:04,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [118828839] [2021-11-23 01:57:04,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:04,806 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:57:04,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:57:04,807 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:57:04,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (101)] Waiting until timeout for monitored process [2021-11-23 01:57:04,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:04,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 01:57:04,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:05,273 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 5 proven. 44 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 01:57:05,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:06,642 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 35 treesize of output 29 [2021-11-23 01:57:07,320 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 4 proven. 53 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 01:57:07,320 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:57:07,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [118828839] [2021-11-23 01:57:07,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [118828839] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:07,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1290716958] [2021-11-23 01:57:07,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:07,321 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:57:07,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:57:07,321 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:57:07,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (102)] Waiting until timeout for monitored process [2021-11-23 01:57:07,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:07,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 01:57:07,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:07,784 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 5 proven. 44 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 01:57:07,784 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:08,284 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 35 treesize of output 29 [2021-11-23 01:57:08,462 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 4 proven. 53 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 01:57:08,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1290716958] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:08,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [660804897] [2021-11-23 01:57:08,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:08,462 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:08,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:08,463 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:08,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2021-11-23 01:57:08,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:08,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 01:57:08,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:08,813 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 5 proven. 44 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 01:57:08,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:09,315 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 35 treesize of output 29 [2021-11-23 01:57:09,492 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 4 proven. 53 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 01:57:09,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [660804897] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:09,493 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:57:09,493 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 10, 13, 10, 13] total 22 [2021-11-23 01:57:09,493 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074334436] [2021-11-23 01:57:09,493 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:09,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-23 01:57:09,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:57:09,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-23 01:57:09,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2021-11-23 01:57:09,494 INFO L87 Difference]: Start difference. First operand 1593 states and 1929 transitions. Second operand has 23 states, 22 states have (on average 3.9545454545454546) internal successors, (87), 23 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:13,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:13,949 INFO L93 Difference]: Finished difference Result 2628 states and 3057 transitions. [2021-11-23 01:57:13,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-23 01:57:13,950 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 3.9545454545454546) internal successors, (87), 23 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-23 01:57:13,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:13,959 INFO L225 Difference]: With dead ends: 2628 [2021-11-23 01:57:13,959 INFO L226 Difference]: Without dead ends: 2557 [2021-11-23 01:57:13,959 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 291 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=539, Invalid=1717, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 01:57:13,959 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 804 mSDsluCounter, 499 mSDsCounter, 0 mSdLazyCounter, 699 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 804 SdHoareTripleChecker+Valid, 562 SdHoareTripleChecker+Invalid, 778 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 699 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:13,960 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [804 Valid, 562 Invalid, 778 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 699 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 01:57:13,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2557 states. [2021-11-23 01:57:13,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2557 to 1531. [2021-11-23 01:57:13,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1531 states, 1526 states have (on average 1.2064220183486238) internal successors, (1841), 1530 states have internal predecessors, (1841), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:13,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1531 states to 1531 states and 1841 transitions. [2021-11-23 01:57:13,986 INFO L78 Accepts]: Start accepts. Automaton has 1531 states and 1841 transitions. Word has length 53 [2021-11-23 01:57:13,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:13,986 INFO L470 AbstractCegarLoop]: Abstraction has 1531 states and 1841 transitions. [2021-11-23 01:57:13,986 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 3.9545454545454546) internal successors, (87), 23 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:13,987 INFO L276 IsEmpty]: Start isEmpty. Operand 1531 states and 1841 transitions. [2021-11-23 01:57:13,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 01:57:13,988 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:13,989 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:14,021 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Ended with exit code 0 [2021-11-23 01:57:14,206 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (102)] Ended with exit code 0 [2021-11-23 01:57:14,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (101)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:14,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 01:57:14,605 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:57:14,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:14,606 INFO L85 PathProgramCache]: Analyzing trace with hash -878193103, now seen corresponding path program 2 times [2021-11-23 01:57:14,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:57:14,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1823547553] [2021-11-23 01:57:14,606 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:57:14,606 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:57:14,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:57:14,607 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:57:14,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (104)] Waiting until timeout for monitored process [2021-11-23 01:57:14,733 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:57:14,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:14,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 01:57:14,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:14,817 INFO L354 Elim1Store]: treesize reduction 42, result has 35.4 percent of original size [2021-11-23 01:57:14,818 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 2 case distinctions, treesize of input 18 treesize of output 30 [2021-11-23 01:57:15,712 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:15,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:18,132 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 9 proven. 41 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:18,132 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:57:18,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1823547553] [2021-11-23 01:57:18,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1823547553] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:18,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1401550985] [2021-11-23 01:57:18,133 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:57:18,133 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:57:18,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:57:18,140 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:57:18,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (105)] Waiting until timeout for monitored process [2021-11-23 01:57:18,423 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:57:18,424 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:18,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 01:57:18,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:18,484 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-23 01:57:18,484 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 2 case distinctions, treesize of input 41 treesize of output 44 [2021-11-23 01:57:18,490 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 01:57:18,490 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 47 treesize of output 43 [2021-11-23 01:57:29,680 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:29,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:32,360 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:32,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1401550985] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:32,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1508521969] [2021-11-23 01:57:32,361 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 01:57:32,361 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:32,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:32,362 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:32,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2021-11-23 01:57:32,447 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 01:57:32,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:32,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 01:57:32,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:32,517 INFO L354 Elim1Store]: treesize reduction 42, result has 35.4 percent of original size [2021-11-23 01:57:32,517 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 2 case distinctions, treesize of input 18 treesize of output 30 [2021-11-23 01:57:33,857 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:33,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:36,362 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:36,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1508521969] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:36,363 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:57:36,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 12, 11, 11, 11] total 47 [2021-11-23 01:57:36,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269570829] [2021-11-23 01:57:36,363 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:57:36,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 01:57:36,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:57:36,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 01:57:36,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=1878, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 01:57:36,364 INFO L87 Difference]: Start difference. First operand 1531 states and 1841 transitions. Second operand has 48 states, 47 states have (on average 5.574468085106383) internal successors, (262), 48 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:39,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:39,348 INFO L93 Difference]: Finished difference Result 2494 states and 2981 transitions. [2021-11-23 01:57:39,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 01:57:39,350 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 5.574468085106383) internal successors, (262), 48 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-23 01:57:39,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:39,360 INFO L225 Difference]: With dead ends: 2494 [2021-11-23 01:57:39,360 INFO L226 Difference]: Without dead ends: 2371 [2021-11-23 01:57:39,361 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 285 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1179 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=521, Invalid=2341, Unknown=0, NotChecked=0, Total=2862 [2021-11-23 01:57:39,361 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 201 mSDsluCounter, 627 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 671 SdHoareTripleChecker+Invalid, 333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 118 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:39,362 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [201 Valid, 671 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 210 Invalid, 0 Unknown, 118 Unchecked, 1.6s Time] [2021-11-23 01:57:39,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2371 states. [2021-11-23 01:57:39,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2371 to 1429. [2021-11-23 01:57:39,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1429 states, 1424 states have (on average 1.220505617977528) internal successors, (1738), 1428 states have internal predecessors, (1738), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:39,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1429 states to 1429 states and 1738 transitions. [2021-11-23 01:57:39,386 INFO L78 Accepts]: Start accepts. Automaton has 1429 states and 1738 transitions. Word has length 56 [2021-11-23 01:57:39,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:39,386 INFO L470 AbstractCegarLoop]: Abstraction has 1429 states and 1738 transitions. [2021-11-23 01:57:39,386 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 5.574468085106383) internal successors, (262), 48 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:57:39,386 INFO L276 IsEmpty]: Start isEmpty. Operand 1429 states and 1738 transitions. [2021-11-23 01:57:39,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 01:57:39,388 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:39,388 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:39,392 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (105)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:39,598 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (104)] Ended with exit code 0 [2021-11-23 01:57:39,811 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Ended with exit code 0 [2021-11-23 01:57:39,991 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:39,991 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:57:39,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:39,991 INFO L85 PathProgramCache]: Analyzing trace with hash -564407577, now seen corresponding path program 5 times [2021-11-23 01:57:39,992 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:57:39,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1056223507] [2021-11-23 01:57:39,992 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 01:57:39,992 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:57:39,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:57:39,993 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:57:39,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (107)] Waiting until timeout for monitored process [2021-11-23 01:57:40,292 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 01:57:40,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:57:40,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 01:57:40,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:40,733 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:40,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:42,026 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 27 treesize of output 23 [2021-11-23 01:57:42,866 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:42,866 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:57:42,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1056223507] [2021-11-23 01:57:42,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1056223507] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:57:42,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1973015191] [2021-11-23 01:57:42,867 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 01:57:42,867 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:57:42,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:57:42,867 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:57:42,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (108)] Waiting until timeout for monitored process [2021-11-23 01:58:38,890 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 01:58:38,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:58:38,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 01:58:38,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:58:39,360 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:58:39,360 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:58:40,077 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 27 treesize of output 23 [2021-11-23 01:58:40,309 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:58:40,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1973015191] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:58:40,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021533855] [2021-11-23 01:58:40,309 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 01:58:40,309 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:58:40,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:58:40,311 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:58:40,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2021-11-23 01:58:45,590 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 01:58:45,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:58:45,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 01:58:45,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:58:45,965 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:58:45,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:58:46,685 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 27 treesize of output 23 [2021-11-23 01:58:46,917 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:58:46,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1021533855] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:58:46,917 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:58:46,917 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10, 10] total 19 [2021-11-23 01:58:46,917 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527989363] [2021-11-23 01:58:46,918 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:58:46,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 01:58:46,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:58:46,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 01:58:46,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=322, Unknown=0, NotChecked=0, Total=380 [2021-11-23 01:58:46,918 INFO L87 Difference]: Start difference. First operand 1429 states and 1738 transitions. Second operand has 20 states, 19 states have (on average 5.684210526315789) internal successors, (108), 20 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:58:54,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:58:54,537 INFO L93 Difference]: Finished difference Result 8810 states and 10738 transitions. [2021-11-23 01:58:54,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-23 01:58:54,538 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 5.684210526315789) internal successors, (108), 20 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-23 01:58:54,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:58:54,555 INFO L225 Difference]: With dead ends: 8810 [2021-11-23 01:58:54,555 INFO L226 Difference]: Without dead ends: 8810 [2021-11-23 01:58:54,556 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 541 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=509, Invalid=2247, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 01:58:54,556 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 2220 mSDsluCounter, 840 mSDsCounter, 0 mSdLazyCounter, 895 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2220 SdHoareTripleChecker+Valid, 930 SdHoareTripleChecker+Invalid, 1028 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 895 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2021-11-23 01:58:54,557 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2220 Valid, 930 Invalid, 1028 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 895 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2021-11-23 01:58:54,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8810 states. [2021-11-23 01:58:54,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8810 to 1782. [2021-11-23 01:58:54,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1782 states, 1777 states have (on average 1.2160945413618458) internal successors, (2161), 1781 states have internal predecessors, (2161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:58:54,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1782 states to 1782 states and 2161 transitions. [2021-11-23 01:58:54,604 INFO L78 Accepts]: Start accepts. Automaton has 1782 states and 2161 transitions. Word has length 56 [2021-11-23 01:58:54,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:58:54,604 INFO L470 AbstractCegarLoop]: Abstraction has 1782 states and 2161 transitions. [2021-11-23 01:58:54,605 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 5.684210526315789) internal successors, (108), 20 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:58:54,605 INFO L276 IsEmpty]: Start isEmpty. Operand 1782 states and 2161 transitions. [2021-11-23 01:58:54,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 01:58:54,606 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:58:54,606 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:58:54,623 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (107)] Forceful destruction successful, exit code 0 [2021-11-23 01:58:54,833 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (108)] Ended with exit code 0 [2021-11-23 01:58:55,045 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Forceful destruction successful, exit code 0 [2021-11-23 01:58:55,221 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:58:55,222 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:58:55,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:58:55,222 INFO L85 PathProgramCache]: Analyzing trace with hash -1544267116, now seen corresponding path program 5 times [2021-11-23 01:58:55,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:58:55,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1562831291] [2021-11-23 01:58:55,222 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 01:58:55,222 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:58:55,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:58:55,223 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:58:55,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (110)] Waiting until timeout for monitored process [2021-11-23 01:58:55,501 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 01:58:55,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:58:55,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 01:58:55,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:58:56,052 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:58:56,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:58:57,783 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 15 proven. 85 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:58:57,783 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 01:58:57,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1562831291] [2021-11-23 01:58:57,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1562831291] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:58:57,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [899251888] [2021-11-23 01:58:57,784 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 01:58:57,784 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 01:58:57,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 01:58:57,784 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 01:58:57,786 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (111)] Waiting until timeout for monitored process [2021-11-23 01:59:23,425 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 01:59:23,425 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:59:23,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 01:59:23,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:59:24,441 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:59:24,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:59:25,875 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 11 proven. 89 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:59:25,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [899251888] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:59:25,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1508840231] [2021-11-23 01:59:25,875 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 01:59:25,875 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:59:25,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:59:25,876 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:59:25,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Waiting until timeout for monitored process [2021-11-23 01:59:41,494 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 01:59:41,494 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:59:41,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 01:59:41,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:59:42,417 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:59:42,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:59:42,823 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:59:42,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1508840231] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 01:59:42,823 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 01:59:42,824 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 18, 18, 20, 17] total 66 [2021-11-23 01:59:42,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099415255] [2021-11-23 01:59:42,824 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 01:59:42,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-23 01:59:42,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 01:59:42,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-23 01:59:42,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=505, Invalid=3785, Unknown=0, NotChecked=0, Total=4290 [2021-11-23 01:59:42,825 INFO L87 Difference]: Start difference. First operand 1782 states and 2161 transitions. Second operand has 66 states, 66 states have (on average 3.1515151515151514) internal successors, (208), 66 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:59:48,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:59:48,755 INFO L93 Difference]: Finished difference Result 3144 states and 3660 transitions. [2021-11-23 01:59:48,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-23 01:59:48,757 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 3.1515151515151514) internal successors, (208), 66 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-23 01:59:48,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:59:48,762 INFO L225 Difference]: With dead ends: 3144 [2021-11-23 01:59:48,762 INFO L226 Difference]: Without dead ends: 3117 [2021-11-23 01:59:48,764 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 273 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3549 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=1693, Invalid=9019, Unknown=0, NotChecked=0, Total=10712 [2021-11-23 01:59:48,764 INFO L933 BasicCegarLoop]: 179 mSDtfsCounter, 1818 mSDsluCounter, 3251 mSDsCounter, 0 mSdLazyCounter, 2404 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1818 SdHoareTripleChecker+Valid, 3430 SdHoareTripleChecker+Invalid, 2540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 2404 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2021-11-23 01:59:48,765 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1818 Valid, 3430 Invalid, 2540 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 2404 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2021-11-23 01:59:48,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3117 states. [2021-11-23 01:59:48,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3117 to 2261. [2021-11-23 01:59:48,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2261 states, 2256 states have (on average 1.236258865248227) internal successors, (2789), 2260 states have internal predecessors, (2789), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:59:48,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2261 states to 2261 states and 2789 transitions. [2021-11-23 01:59:48,809 INFO L78 Accepts]: Start accepts. Automaton has 2261 states and 2789 transitions. Word has length 57 [2021-11-23 01:59:48,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:59:48,810 INFO L470 AbstractCegarLoop]: Abstraction has 2261 states and 2789 transitions. [2021-11-23 01:59:48,810 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 3.1515151515151514) internal successors, (208), 66 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 01:59:48,810 INFO L276 IsEmpty]: Start isEmpty. Operand 2261 states and 2789 transitions. [2021-11-23 01:59:48,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 01:59:48,812 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:59:48,812 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:59:48,826 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (110)] Ended with exit code 0 [2021-11-23 01:59:49,051 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Ended with exit code 0 [2021-11-23 01:59:49,232 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (111)] Forceful destruction successful, exit code 0 [2021-11-23 01:59:49,427 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 01:59:49,427 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 01:59:49,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:59:49,427 INFO L85 PathProgramCache]: Analyzing trace with hash -987577769, now seen corresponding path program 6 times [2021-11-23 01:59:49,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 01:59:49,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1564146474] [2021-11-23 01:59:49,428 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 01:59:49,428 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 01:59:49,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 01:59:49,428 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 01:59:49,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (113)] Waiting until timeout for monitored process [2021-11-23 01:59:49,660 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-23 01:59:49,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 01:59:49,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 01:59:49,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:59:49,730 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 01:59:49,730 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 2 case distinctions, treesize of input 32 treesize of output 39 [2021-11-23 01:59:49,733 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 41 treesize of output 39 [2021-11-23 02:00:03,141 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-23 02:00:03,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:00:06,518 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 57 treesize of output 55 [2021-11-23 02:00:06,635 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-23 02:00:06,636 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:00:06,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1564146474] [2021-11-23 02:00:06,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1564146474] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:00:06,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1807557206] [2021-11-23 02:00:06,636 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 02:00:06,636 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:00:06,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:00:06,637 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:00:06,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (114)] Waiting until timeout for monitored process [2021-11-23 02:00:07,346 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-23 02:00:07,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:00:07,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 02:00:07,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:00:07,410 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 02:00:07,410 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 2 case distinctions, treesize of input 31 treesize of output 38 [2021-11-23 02:00:07,413 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 40 treesize of output 38 [2021-11-23 02:00:11,249 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-23 02:00:11,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:00:20,896 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 78 treesize of output 76 [2021-11-23 02:00:20,932 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-23 02:00:20,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1807557206] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:00:20,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1548414621] [2021-11-23 02:00:20,933 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 02:00:20,933 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:00:20,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:00:20,934 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:00:20,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2021-11-23 02:00:22,014 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-23 02:00:22,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:00:22,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 02:00:22,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:00:22,090 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 02:00:22,090 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 2 case distinctions, treesize of input 32 treesize of output 39 [2021-11-23 02:00:22,097 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 41 treesize of output 39 [2021-11-23 02:00:40,579 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:00:40,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:00:48,184 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 58 treesize of output 56 [2021-11-23 02:00:48,206 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 21 proven. 100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:00:48,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1548414621] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:00:48,207 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:00:48,207 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 14, 14, 17, 18] total 64 [2021-11-23 02:00:48,207 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447981515] [2021-11-23 02:00:48,207 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:00:48,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-23 02:00:48,208 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:00:48,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-23 02:00:48,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=549, Invalid=3611, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 02:00:48,209 INFO L87 Difference]: Start difference. First operand 2261 states and 2789 transitions. Second operand has 65 states, 64 states have (on average 3.484375) internal successors, (223), 65 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:01:36,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:01:36,871 INFO L93 Difference]: Finished difference Result 2573 states and 3177 transitions. [2021-11-23 02:01:36,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-23 02:01:36,872 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 64 states have (on average 3.484375) internal successors, (223), 65 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-23 02:01:36,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:01:36,875 INFO L225 Difference]: With dead ends: 2573 [2021-11-23 02:01:36,875 INFO L226 Difference]: Without dead ends: 2573 [2021-11-23 02:01:36,877 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 315 SyntacticMatches, 19 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4240 ImplicationChecksByTransitivity, 90.5s TimeCoverageRelationStatistics Valid=1633, Invalid=8467, Unknown=0, NotChecked=0, Total=10100 [2021-11-23 02:01:36,877 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 95 mSDsluCounter, 872 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 911 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 134 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:01:36,878 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 911 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 128 Invalid, 0 Unknown, 134 Unchecked, 1.7s Time] [2021-11-23 02:01:36,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2573 states. [2021-11-23 02:01:36,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2573 to 2364. [2021-11-23 02:01:36,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2364 states, 2359 states have (on average 1.241627808393387) internal successors, (2929), 2363 states have internal predecessors, (2929), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:01:36,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2364 states to 2364 states and 2929 transitions. [2021-11-23 02:01:36,915 INFO L78 Accepts]: Start accepts. Automaton has 2364 states and 2929 transitions. Word has length 61 [2021-11-23 02:01:36,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:01:36,916 INFO L470 AbstractCegarLoop]: Abstraction has 2364 states and 2929 transitions. [2021-11-23 02:01:36,916 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 64 states have (on average 3.484375) internal successors, (223), 65 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:01:36,916 INFO L276 IsEmpty]: Start isEmpty. Operand 2364 states and 2929 transitions. [2021-11-23 02:01:36,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 02:01:36,918 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:01:36,919 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:01:36,923 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (114)] Forceful destruction successful, exit code 0 [2021-11-23 02:01:37,146 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Ended with exit code 0 [2021-11-23 02:01:37,332 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (113)] Forceful destruction successful, exit code 0 [2021-11-23 02:01:37,523 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:01:37,523 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:01:37,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:01:37,524 INFO L85 PathProgramCache]: Analyzing trace with hash 1746378977, now seen corresponding path program 2 times [2021-11-23 02:01:37,524 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:01:37,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [976370788] [2021-11-23 02:01:37,524 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:01:37,524 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:01:37,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:01:37,525 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:01:37,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (116)] Waiting until timeout for monitored process [2021-11-23 02:01:37,686 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:01:37,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:01:37,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 02:01:37,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:01:37,764 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 02:01:37,764 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 2 case distinctions, treesize of input 37 treesize of output 44 [2021-11-23 02:01:37,767 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 46 treesize of output 44 [2021-11-23 02:01:46,243 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 34 proven. 49 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:01:46,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:01:49,172 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 10 proven. 73 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:01:49,173 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:01:49,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [976370788] [2021-11-23 02:01:49,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [976370788] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:01:49,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1263903390] [2021-11-23 02:01:49,173 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:01:49,173 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:01:49,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:01:49,174 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:01:49,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (117)] Waiting until timeout for monitored process [2021-11-23 02:01:49,391 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:01:49,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:01:49,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 02:01:49,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:01:49,455 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 02:01:49,455 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 2 case distinctions, treesize of input 31 treesize of output 38 [2021-11-23 02:01:49,459 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 40 treesize of output 38 [2021-11-23 02:02:09,219 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 34 proven. 49 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:02:09,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:02:12,871 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 34 treesize of output 32 [2021-11-23 02:02:12,882 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:02:12,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1263903390] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:02:12,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [407006673] [2021-11-23 02:02:12,882 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:02:12,882 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:02:12,882 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:02:12,883 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:02:12,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Waiting until timeout for monitored process [2021-11-23 02:02:13,010 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:02:13,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:02:13,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:02:13,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:02:16,303 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 34 proven. 49 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:02:16,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:02:16,916 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 27 treesize of output 23 [2021-11-23 02:02:19,532 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:02:19,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [407006673] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:02:19,532 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:02:19,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 15, 14, 12, 12] total 60 [2021-11-23 02:02:19,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032881310] [2021-11-23 02:02:19,533 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:02:19,533 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-23 02:02:19,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:02:19,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-23 02:02:19,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=480, Invalid=3180, Unknown=0, NotChecked=0, Total=3660 [2021-11-23 02:02:19,534 INFO L87 Difference]: Start difference. First operand 2364 states and 2929 transitions. Second operand has 61 states, 60 states have (on average 4.166666666666667) internal successors, (250), 61 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:02:41,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:02:41,657 INFO L93 Difference]: Finished difference Result 3035 states and 3673 transitions. [2021-11-23 02:02:41,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-23 02:02:41,661 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 4.166666666666667) internal successors, (250), 61 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-23 02:02:41,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:02:41,666 INFO L225 Difference]: With dead ends: 3035 [2021-11-23 02:02:41,667 INFO L226 Difference]: Without dead ends: 3003 [2021-11-23 02:02:41,668 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 305 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2529 ImplicationChecksByTransitivity, 53.8s TimeCoverageRelationStatistics Valid=827, Invalid=5653, Unknown=0, NotChecked=0, Total=6480 [2021-11-23 02:02:41,668 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 122 mSDsluCounter, 717 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 761 SdHoareTripleChecker+Invalid, 682 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 317 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:02:41,669 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 761 Invalid, 682 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 362 Invalid, 0 Unknown, 317 Unchecked, 2.6s Time] [2021-11-23 02:02:41,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3003 states. [2021-11-23 02:02:41,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3003 to 2526. [2021-11-23 02:02:41,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2526 states, 2521 states have (on average 1.2380007933359778) internal successors, (3121), 2525 states have internal predecessors, (3121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:02:41,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2526 states to 2526 states and 3121 transitions. [2021-11-23 02:02:41,711 INFO L78 Accepts]: Start accepts. Automaton has 2526 states and 3121 transitions. Word has length 61 [2021-11-23 02:02:41,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:02:41,712 INFO L470 AbstractCegarLoop]: Abstraction has 2526 states and 3121 transitions. [2021-11-23 02:02:41,712 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 60 states have (on average 4.166666666666667) internal successors, (250), 61 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:02:41,712 INFO L276 IsEmpty]: Start isEmpty. Operand 2526 states and 3121 transitions. [2021-11-23 02:02:41,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 02:02:41,715 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:02:41,715 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:02:41,761 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Ended with exit code 0 [2021-11-23 02:02:41,938 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (117)] Forceful destruction successful, exit code 0 [2021-11-23 02:02:42,146 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (116)] Forceful destruction successful, exit code 0 [2021-11-23 02:02:42,336 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:02:42,336 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:02:42,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:02:42,337 INFO L85 PathProgramCache]: Analyzing trace with hash 1288171396, now seen corresponding path program 6 times [2021-11-23 02:02:42,337 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:02:42,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1702714799] [2021-11-23 02:02:42,337 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 02:02:42,337 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:02:42,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:02:42,338 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:02:42,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (119)] Waiting until timeout for monitored process [2021-11-23 02:02:42,582 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-11-23 02:02:42,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:02:42,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:02:42,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:02:42,678 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-23 02:02:42,678 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 2 case distinctions, treesize of input 41 treesize of output 44 [2021-11-23 02:02:42,685 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:02:42,686 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 47 treesize of output 43 [2021-11-23 02:02:48,815 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 1 proven. 76 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:02:48,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:02:52,519 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:02:52,519 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 128 treesize of output 124 [2021-11-23 02:02:52,656 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 1 proven. 76 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:02:52,656 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:02:52,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1702714799] [2021-11-23 02:02:52,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1702714799] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:02:52,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1013548051] [2021-11-23 02:02:52,656 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 02:02:52,657 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:02:52,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:02:52,658 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:02:52,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (120)] Waiting until timeout for monitored process [2021-11-23 02:02:53,088 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-11-23 02:02:53,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:02:53,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:02:53,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:02:53,272 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-23 02:02:53,272 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 2 case distinctions, treesize of input 43 treesize of output 46 [2021-11-23 02:02:53,278 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:02:53,279 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 49 treesize of output 45 [2021-11-23 02:02:59,123 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 1 proven. 76 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:02:59,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:03:04,590 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:03:04,590 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 128 treesize of output 124 [2021-11-23 02:03:04,629 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 1 proven. 76 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:03:04,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1013548051] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:03:04,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [190575130] [2021-11-23 02:03:04,630 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 02:03:04,630 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:04,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:04,631 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:03:04,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Waiting until timeout for monitored process [2021-11-23 02:03:04,855 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-11-23 02:03:04,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:03:04,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 02:03:04,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:04,934 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-23 02:03:04,935 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 2 case distinctions, treesize of input 42 treesize of output 45 [2021-11-23 02:03:04,940 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:03:04,941 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 48 treesize of output 44 [2021-11-23 02:03:10,121 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 1 proven. 76 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:03:10,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:03:12,344 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:03:12,344 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 128 treesize of output 124 [2021-11-23 02:03:12,386 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 1 proven. 76 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:03:12,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [190575130] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:03:12,387 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:03:12,387 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10, 10] total 30 [2021-11-23 02:03:12,387 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564772478] [2021-11-23 02:03:12,387 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:03:12,387 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-23 02:03:12,387 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:03:12,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-23 02:03:12,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=740, Unknown=0, NotChecked=0, Total=930 [2021-11-23 02:03:12,388 INFO L87 Difference]: Start difference. First operand 2526 states and 3121 transitions. Second operand has 31 states, 30 states have (on average 6.133333333333334) internal successors, (184), 31 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:03:18,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:18,337 INFO L93 Difference]: Finished difference Result 3517 states and 4333 transitions. [2021-11-23 02:03:18,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 02:03:18,337 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 6.133333333333334) internal successors, (184), 31 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 02:03:18,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:18,345 INFO L225 Difference]: With dead ends: 3517 [2021-11-23 02:03:18,345 INFO L226 Difference]: Without dead ends: 3517 [2021-11-23 02:03:18,345 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 355 SyntacticMatches, 4 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 516 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=427, Invalid=1465, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 02:03:18,346 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 146 mSDsluCounter, 509 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 552 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 39 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:18,346 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [146 Valid, 552 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 9 Invalid, 0 Unknown, 39 Unchecked, 0.1s Time] [2021-11-23 02:03:18,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3517 states. [2021-11-23 02:03:18,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3517 to 3221. [2021-11-23 02:03:18,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3221 states, 3216 states have (on average 1.2487562189054726) internal successors, (4016), 3220 states have internal predecessors, (4016), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:03:18,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3221 states to 3221 states and 4016 transitions. [2021-11-23 02:03:18,402 INFO L78 Accepts]: Start accepts. Automaton has 3221 states and 4016 transitions. Word has length 64 [2021-11-23 02:03:18,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:18,402 INFO L470 AbstractCegarLoop]: Abstraction has 3221 states and 4016 transitions. [2021-11-23 02:03:18,402 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 6.133333333333334) internal successors, (184), 31 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:03:18,403 INFO L276 IsEmpty]: Start isEmpty. Operand 3221 states and 4016 transitions. [2021-11-23 02:03:18,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 02:03:18,405 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:18,405 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:18,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (120)] Forceful destruction successful, exit code 0 [2021-11-23 02:03:18,621 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (119)] Forceful destruction successful, exit code 0 [2021-11-23 02:03:18,840 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Ended with exit code 0 [2021-11-23 02:03:19,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:19,017 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:03:19,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:19,017 INFO L85 PathProgramCache]: Analyzing trace with hash -1942992570, now seen corresponding path program 4 times [2021-11-23 02:03:19,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:03:19,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [362131397] [2021-11-23 02:03:19,018 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:03:19,018 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:03:19,018 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:03:19,024 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:03:19,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (122)] Waiting until timeout for monitored process [2021-11-23 02:03:19,246 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:03:19,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:03:19,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:03:19,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:19,954 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 12 proven. 92 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:03:19,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:03:20,729 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 12 proven. 92 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:03:20,729 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:03:20,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [362131397] [2021-11-23 02:03:20,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [362131397] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:03:20,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1985146835] [2021-11-23 02:03:20,729 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:03:20,729 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:03:20,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:03:20,730 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:03:20,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (123)] Waiting until timeout for monitored process [2021-11-23 02:03:20,938 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:03:20,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:03:20,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:03:20,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:21,800 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 12 proven. 92 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:03:21,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:03:22,636 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 12 proven. 92 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:03:22,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1985146835] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:03:22,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [294448556] [2021-11-23 02:03:22,636 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:03:22,636 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:22,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:22,637 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:03:22,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Waiting until timeout for monitored process [2021-11-23 02:03:22,724 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:03:22,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:03:22,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:03:22,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:23,193 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 12 proven. 92 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:03:23,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:03:23,595 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 12 proven. 92 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:03:23,596 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [294448556] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:03:23,596 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:03:23,596 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 15, 14, 15, 14] total 37 [2021-11-23 02:03:23,596 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761732728] [2021-11-23 02:03:23,596 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:03:23,597 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-23 02:03:23,597 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:03:23,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-23 02:03:23,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1152, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:03:23,598 INFO L87 Difference]: Start difference. First operand 3221 states and 4016 transitions. Second operand has 37 states, 37 states have (on average 5.1891891891891895) internal successors, (192), 37 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:03:25,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:25,505 INFO L93 Difference]: Finished difference Result 5120 states and 6293 transitions. [2021-11-23 02:03:25,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 02:03:25,508 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 5.1891891891891895) internal successors, (192), 37 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-23 02:03:25,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:25,515 INFO L225 Difference]: With dead ends: 5120 [2021-11-23 02:03:25,515 INFO L226 Difference]: Without dead ends: 4548 [2021-11-23 02:03:25,516 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 414 GetRequests, 360 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 667 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=539, Invalid=2431, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 02:03:25,516 INFO L933 BasicCegarLoop]: 123 mSDtfsCounter, 964 mSDsluCounter, 1563 mSDsCounter, 0 mSdLazyCounter, 825 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 964 SdHoareTripleChecker+Valid, 1686 SdHoareTripleChecker+Invalid, 903 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 825 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:25,517 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [964 Valid, 1686 Invalid, 903 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 825 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 02:03:25,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4548 states. [2021-11-23 02:03:25,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4548 to 3860. [2021-11-23 02:03:25,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3860 states, 3855 states have (on average 1.2412451361867705) internal successors, (4785), 3859 states have internal predecessors, (4785), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:03:25,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3860 states to 3860 states and 4785 transitions. [2021-11-23 02:03:25,587 INFO L78 Accepts]: Start accepts. Automaton has 3860 states and 4785 transitions. Word has length 67 [2021-11-23 02:03:25,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:25,587 INFO L470 AbstractCegarLoop]: Abstraction has 3860 states and 4785 transitions. [2021-11-23 02:03:25,587 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 5.1891891891891895) internal successors, (192), 37 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:03:25,588 INFO L276 IsEmpty]: Start isEmpty. Operand 3860 states and 4785 transitions. [2021-11-23 02:03:25,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 02:03:25,590 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:25,590 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:25,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Forceful destruction successful, exit code 0 [2021-11-23 02:03:25,805 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (123)] Ended with exit code 0 [2021-11-23 02:03:26,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (122)] Forceful destruction successful, exit code 0 [2021-11-23 02:03:26,204 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:03:26,204 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:03:26,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:26,204 INFO L85 PathProgramCache]: Analyzing trace with hash -1770568872, now seen corresponding path program 4 times [2021-11-23 02:03:26,205 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:03:26,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1894080753] [2021-11-23 02:03:26,205 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:03:26,205 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:03:26,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:03:26,206 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:03:26,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (125)] Waiting until timeout for monitored process [2021-11-23 02:03:26,383 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:03:26,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:03:26,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 02:03:26,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:26,484 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 02:03:26,484 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 2 case distinctions, treesize of input 30 treesize of output 37 [2021-11-23 02:03:26,492 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 38 treesize of output 36 [2021-11-23 02:03:35,986 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:03:35,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:03:49,978 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 168 treesize of output 166 [2021-11-23 02:03:50,422 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:03:50,422 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:03:50,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1894080753] [2021-11-23 02:03:50,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1894080753] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:03:50,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1339134122] [2021-11-23 02:03:50,422 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:03:50,423 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:03:50,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:03:50,424 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:03:50,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_13f35131-2caf-4bdf-82c1-4ed1c8dc217a/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (126)] Waiting until timeout for monitored process [2021-11-23 02:03:51,560 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:03:51,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:03:51,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 02:03:51,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:52,072 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-23 02:03:52,073 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 2 case distinctions, treesize of input 29 treesize of output 36 [2021-11-23 02:03:52,076 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 37 treesize of output 35 [2021-11-23 02:04:01,108 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:01,108 INFO L328 TraceCheckSpWp]: Computing backward predicates...