./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 0f8a17c6 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/diff-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs --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-0f8a17c [2021-11-19 13:42:06,050 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 13:42:06,053 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 13:42:06,106 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 13:42:06,106 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 13:42:06,111 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 13:42:06,113 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 13:42:06,117 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 13:42:06,120 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 13:42:06,125 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 13:42:06,127 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 13:42:06,128 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 13:42:06,129 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 13:42:06,132 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 13:42:06,134 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 13:42:06,144 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 13:42:06,146 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 13:42:06,147 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 13:42:06,150 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 13:42:06,160 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 13:42:06,162 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 13:42:06,164 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 13:42:06,167 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 13:42:06,169 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 13:42:06,178 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 13:42:06,178 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 13:42:06,179 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 13:42:06,181 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 13:42:06,182 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 13:42:06,183 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 13:42:06,185 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 13:42:06,186 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 13:42:06,188 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 13:42:06,189 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 13:42:06,191 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 13:42:06,191 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 13:42:06,192 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 13:42:06,192 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 13:42:06,192 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 13:42:06,193 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 13:42:06,194 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 13:42:06,195 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-19 13:42:06,242 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 13:42:06,242 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 13:42:06,243 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 13:42:06,244 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 13:42:06,244 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-19 13:42:06,244 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-19 13:42:06,244 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-19 13:42:06,245 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-19 13:42:06,245 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-19 13:42:06,245 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-19 13:42:06,245 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-19 13:42:06,246 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-19 13:42:06,246 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-19 13:42:06,246 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-19 13:42:06,246 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-19 13:42:06,247 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-19 13:42:06,247 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-19 13:42:06,248 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-19 13:42:06,248 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 13:42:06,248 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-19 13:42:06,249 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-19 13:42:06,249 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 13:42:06,249 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-19 13:42:06,249 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 13:42:06,250 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-19 13:42:06,250 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-19 13:42:06,250 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-19 13:42:06,250 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 13:42:06,250 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-19 13:42:06,251 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-19 13:42:06,251 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 13:42:06,251 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 13:42:06,251 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 13:42:06,252 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 13:42:06,252 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 13:42:06,252 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 13:42:06,253 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-19 13:42:06,253 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-19 13:42:06,253 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 13:42:06,253 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-19 13:42:06,253 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_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5cc33a4b6801f9f06dbbb17ff694aba4439c76c6a2b62ec290c2132cc01ea0fe [2021-11-19 13:42:06,506 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 13:42:06,529 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 13:42:06,531 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 13:42:06,532 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 13:42:06,532 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 13:42:06,533 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/../../sv-benchmarks/c/array-memsafety/diff-alloca-2.i [2021-11-19 13:42:06,595 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/data/c72ac1250/76770203d84744c8b72ad6524cced190/FLAG79fb93b50 [2021-11-19 13:42:07,151 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 13:42:07,152 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/sv-benchmarks/c/array-memsafety/diff-alloca-2.i [2021-11-19 13:42:07,167 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/data/c72ac1250/76770203d84744c8b72ad6524cced190/FLAG79fb93b50 [2021-11-19 13:42:07,431 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/data/c72ac1250/76770203d84744c8b72ad6524cced190 [2021-11-19 13:42:07,434 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 13:42:07,435 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-19 13:42:07,437 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 13:42:07,437 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 13:42:07,440 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 13:42:07,441 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 01:42:07" (1/1) ... [2021-11-19 13:42:07,443 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5caf169b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:42:07, skipping insertion in model container [2021-11-19 13:42:07,443 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 01:42:07" (1/1) ... [2021-11-19 13:42:07,450 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 13:42:07,490 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 13:42:07,852 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 13:42:07,861 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) [2021-11-19 13:42:07,862 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@31c5c0ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:42:07, skipping insertion in model container [2021-11-19 13:42:07,862 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 13:42:07,862 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-19 13:42:07,865 INFO L158 Benchmark]: Toolchain (without parser) took 427.96ms. Allocated memory was 104.9MB in the beginning and 130.0MB in the end (delta: 25.2MB). Free memory was 73.6MB in the beginning and 104.0MB in the end (delta: -30.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-19 13:42:07,865 INFO L158 Benchmark]: CDTParser took 0.14ms. Allocated memory is still 104.9MB. Free memory is still 62.4MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-19 13:42:07,866 INFO L158 Benchmark]: CACSL2BoogieTranslator took 425.21ms. Allocated memory was 104.9MB in the beginning and 130.0MB in the end (delta: 25.2MB). Free memory was 73.6MB in the beginning and 104.0MB in the end (delta: -30.4MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-19 13:42:07,868 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14ms. Allocated memory is still 104.9MB. Free memory is still 62.4MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 425.21ms. Allocated memory was 104.9MB in the beginning and 130.0MB in the end (delta: 25.2MB). Free memory was 73.6MB in the beginning and 104.0MB in the end (delta: -30.4MB). Peak memory consumption was 8.4MB. 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_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/diff-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs --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-0f8a17c [2021-11-19 13:42:10,217 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 13:42:10,221 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 13:42:10,276 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 13:42:10,277 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 13:42:10,282 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 13:42:10,284 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 13:42:10,288 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 13:42:10,291 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 13:42:10,299 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 13:42:10,301 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 13:42:10,303 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 13:42:10,303 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 13:42:10,306 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 13:42:10,308 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 13:42:10,313 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 13:42:10,315 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 13:42:10,316 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 13:42:10,318 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 13:42:10,328 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 13:42:10,331 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 13:42:10,332 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 13:42:10,336 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 13:42:10,338 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 13:42:10,347 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 13:42:10,347 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 13:42:10,348 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 13:42:10,350 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 13:42:10,350 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 13:42:10,352 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 13:42:10,352 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 13:42:10,353 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 13:42:10,355 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 13:42:10,356 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 13:42:10,358 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 13:42:10,358 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 13:42:10,359 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 13:42:10,359 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 13:42:10,375 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 13:42:10,377 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 13:42:10,378 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 13:42:10,383 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2021-11-19 13:42:10,432 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 13:42:10,433 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 13:42:10,434 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 13:42:10,434 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 13:42:10,435 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-19 13:42:10,435 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-19 13:42:10,435 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-19 13:42:10,435 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-19 13:42:10,436 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-19 13:42:10,436 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-19 13:42:10,438 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-19 13:42:10,438 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-19 13:42:10,439 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 13:42:10,439 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-19 13:42:10,439 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-19 13:42:10,439 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 13:42:10,440 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-19 13:42:10,440 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 13:42:10,440 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-19 13:42:10,440 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-19 13:42:10,441 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-19 13:42:10,441 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 13:42:10,441 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-19 13:42:10,441 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-19 13:42:10,441 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-19 13:42:10,442 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-19 13:42:10,442 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 13:42:10,442 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 13:42:10,442 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-19 13:42:10,443 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 13:42:10,443 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 13:42:10,443 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 13:42:10,444 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 13:42:10,444 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-19 13:42:10,444 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-19 13:42:10,445 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 13:42:10,445 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-19 13:42:10,445 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_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5cc33a4b6801f9f06dbbb17ff694aba4439c76c6a2b62ec290c2132cc01ea0fe [2021-11-19 13:42:10,830 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 13:42:10,856 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 13:42:10,859 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 13:42:10,860 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 13:42:10,861 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 13:42:10,862 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/../../sv-benchmarks/c/array-memsafety/diff-alloca-2.i [2021-11-19 13:42:10,945 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/data/4e4764b53/fab32977253744de94e86028f87394ad/FLAG7421b0a92 [2021-11-19 13:42:11,561 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 13:42:11,562 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/sv-benchmarks/c/array-memsafety/diff-alloca-2.i [2021-11-19 13:42:11,580 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/data/4e4764b53/fab32977253744de94e86028f87394ad/FLAG7421b0a92 [2021-11-19 13:42:11,823 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/data/4e4764b53/fab32977253744de94e86028f87394ad [2021-11-19 13:42:11,826 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 13:42:11,827 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-19 13:42:11,829 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 13:42:11,829 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 13:42:11,838 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 13:42:11,839 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 01:42:11" (1/1) ... [2021-11-19 13:42:11,847 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3897f89a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:42:11, skipping insertion in model container [2021-11-19 13:42:11,847 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 01:42:11" (1/1) ... [2021-11-19 13:42:11,855 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 13:42:11,887 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 13:42:12,239 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 13:42:12,262 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-19 13:42:12,280 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 13:42:12,345 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 13:42:12,353 INFO L203 MainTranslator]: Completed pre-run [2021-11-19 13:42:12,409 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 13:42:12,449 INFO L208 MainTranslator]: Completed translation [2021-11-19 13:42:12,450 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:42:12 WrapperNode [2021-11-19 13:42:12,450 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 13:42:12,451 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-19 13:42:12,452 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-19 13:42:12,452 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-19 13:42:12,460 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:42:12" (1/1) ... [2021-11-19 13:42:12,485 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:42:12" (1/1) ... [2021-11-19 13:42:12,514 INFO L137 Inliner]: procedures = 117, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 96 [2021-11-19 13:42:12,514 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-19 13:42:12,516 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-19 13:42:12,516 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-19 13:42:12,516 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-19 13:42:12,525 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:42:12" (1/1) ... [2021-11-19 13:42:12,525 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:42:12" (1/1) ... [2021-11-19 13:42:12,530 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:42:12" (1/1) ... [2021-11-19 13:42:12,530 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:42:12" (1/1) ... [2021-11-19 13:42:12,553 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:42:12" (1/1) ... [2021-11-19 13:42:12,558 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:42:12" (1/1) ... [2021-11-19 13:42:12,560 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:42:12" (1/1) ... [2021-11-19 13:42:12,564 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-19 13:42:12,566 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-19 13:42:12,566 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-19 13:42:12,566 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-19 13:42:12,567 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:42:12" (1/1) ... [2021-11-19 13:42:12,573 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 13:42:12,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:42:12,597 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-19 13:42:12,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-19 13:42:12,638 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-19 13:42:12,639 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-19 13:42:12,639 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-19 13:42:12,639 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-19 13:42:12,639 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-19 13:42:12,639 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-19 13:42:12,749 INFO L236 CfgBuilder]: Building ICFG [2021-11-19 13:42:12,750 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-19 13:42:13,194 INFO L277 CfgBuilder]: Performing block encoding [2021-11-19 13:42:13,201 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-19 13:42:13,201 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-19 13:42:13,203 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 01:42:13 BoogieIcfgContainer [2021-11-19 13:42:13,203 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-19 13:42:13,205 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-19 13:42:13,205 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-19 13:42:13,207 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-19 13:42:13,208 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 01:42:11" (1/3) ... [2021-11-19 13:42:13,208 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55681c32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 01:42:13, skipping insertion in model container [2021-11-19 13:42:13,209 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 01:42:12" (2/3) ... [2021-11-19 13:42:13,209 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55681c32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 01:42:13, skipping insertion in model container [2021-11-19 13:42:13,209 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 01:42:13" (3/3) ... [2021-11-19 13:42:13,210 INFO L111 eAbstractionObserver]: Analyzing ICFG diff-alloca-2.i [2021-11-19 13:42:13,216 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-19 13:42:13,216 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 13 error locations. [2021-11-19 13:42:13,261 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-19 13:42:13,268 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 [2021-11-19 13:42:13,268 INFO L340 AbstractCegarLoop]: Starting to check reachability of 13 error locations. [2021-11-19 13:42:13,283 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) [2021-11-19 13:42:13,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-19 13:42:13,289 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:42:13,290 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:42:13,290 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:42:13,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:42:13,296 INFO L85 PathProgramCache]: Analyzing trace with hash 1805029096, now seen corresponding path program 1 times [2021-11-19 13:42:13,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:42:13,308 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [105206850] [2021-11-19 13:42:13,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:13,309 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:42:13,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:42:13,312 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:42:13,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-19 13:42:13,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:13,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 13:42:13,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:13,581 INFO L354 Elim1Store]: treesize reduction 39, result has 29.1 percent of original size [2021-11-19 13:42:13,582 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 [2021-11-19 13:42:13,721 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:13,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:13,765 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:13,766 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:42:13,766 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [105206850] [2021-11-19 13:42:13,767 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [105206850] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:42:13,767 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:42:13,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 3 [2021-11-19 13:42:13,769 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329071851] [2021-11-19 13:42:13,770 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:42:13,774 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 13:42:13,774 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:42:13,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 13:42:13,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-19 13:42:13,806 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) [2021-11-19 13:42:13,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:42:13,908 INFO L93 Difference]: Finished difference Result 49 states and 60 transitions. [2021-11-19 13:42:13,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:42:13,911 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 [2021-11-19 13:42:13,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:42:13,919 INFO L225 Difference]: With dead ends: 49 [2021-11-19 13:42:13,920 INFO L226 Difference]: Without dead ends: 47 [2021-11-19 13:42:13,921 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-19 13:42:13,925 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 [2021-11-19 13:42:13,926 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] [2021-11-19 13:42:13,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-19 13:42:13,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 42. [2021-11-19 13:42:13,957 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) [2021-11-19 13:42:13,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 51 transitions. [2021-11-19 13:42:13,960 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 51 transitions. Word has length 7 [2021-11-19 13:42:13,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:42:13,960 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 51 transitions. [2021-11-19 13:42:13,961 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) [2021-11-19 13:42:13,961 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 51 transitions. [2021-11-19 13:42:13,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-19 13:42:13,961 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:42:13,961 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:42:13,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:14,162 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:42:14,162 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:42:14,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:42:14,163 INFO L85 PathProgramCache]: Analyzing trace with hash 1805029097, now seen corresponding path program 1 times [2021-11-19 13:42:14,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:42:14,164 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1425829849] [2021-11-19 13:42:14,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:14,165 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:42:14,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:42:14,174 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:42:14,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-19 13:42:14,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:14,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-19 13:42:14,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:14,340 INFO L354 Elim1Store]: treesize reduction 42, result has 28.8 percent of original size [2021-11-19 13:42:14,340 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 [2021-11-19 13:42:14,347 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 [2021-11-19 13:42:14,865 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:14,865 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:15,066 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 [2021-11-19 13:42:15,144 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:15,144 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:42:15,145 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1425829849] [2021-11-19 13:42:15,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1425829849] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:42:15,145 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:42:15,146 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-11-19 13:42:15,146 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257515967] [2021-11-19 13:42:15,147 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:42:15,152 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-19 13:42:15,152 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:42:15,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-19 13:42:15,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-19 13:42:15,154 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) [2021-11-19 13:42:15,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:42:15,564 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2021-11-19 13:42:15,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-19 13:42:15,566 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 [2021-11-19 13:42:15,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:42:15,567 INFO L225 Difference]: With dead ends: 46 [2021-11-19 13:42:15,567 INFO L226 Difference]: Without dead ends: 46 [2021-11-19 13:42:15,567 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 [2021-11-19 13:42:15,569 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 [2021-11-19 13:42:15,570 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] [2021-11-19 13:42:15,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-19 13:42:15,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2021-11-19 13:42:15,575 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) [2021-11-19 13:42:15,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2021-11-19 13:42:15,576 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 7 [2021-11-19 13:42:15,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:42:15,576 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2021-11-19 13:42:15,577 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) [2021-11-19 13:42:15,577 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2021-11-19 13:42:15,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-19 13:42:15,578 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:42:15,578 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:42:15,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:15,788 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:42:15,789 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:42:15,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:42:15,790 INFO L85 PathProgramCache]: Analyzing trace with hash -533876908, now seen corresponding path program 1 times [2021-11-19 13:42:15,790 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:42:15,791 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [992465110] [2021-11-19 13:42:15,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:15,791 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:42:15,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:42:15,795 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:42:15,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-19 13:42:15,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:15,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-19 13:42:15,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:15,895 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:15,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:15,936 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:15,937 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:42:15,937 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [992465110] [2021-11-19 13:42:15,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [992465110] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:42:15,937 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:42:15,938 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-19 13:42:15,939 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004432051] [2021-11-19 13:42:15,939 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:42:15,939 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-19 13:42:15,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:42:15,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-19 13:42:15,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-19 13:42:15,941 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) [2021-11-19 13:42:16,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:42:16,060 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2021-11-19 13:42:16,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-19 13:42:16,063 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 [2021-11-19 13:42:16,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:42:16,064 INFO L225 Difference]: With dead ends: 83 [2021-11-19 13:42:16,066 INFO L226 Difference]: Without dead ends: 83 [2021-11-19 13:42:16,067 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 [2021-11-19 13:42:16,068 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 [2021-11-19 13:42:16,069 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] [2021-11-19 13:42:16,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-19 13:42:16,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 42. [2021-11-19 13:42:16,075 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) [2021-11-19 13:42:16,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2021-11-19 13:42:16,081 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 9 [2021-11-19 13:42:16,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:42:16,083 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2021-11-19 13:42:16,083 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) [2021-11-19 13:42:16,083 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2021-11-19 13:42:16,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-19 13:42:16,084 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:42:16,084 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:42:16,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:16,295 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:42:16,295 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:42:16,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:42:16,296 INFO L85 PathProgramCache]: Analyzing trace with hash -1906083541, now seen corresponding path program 1 times [2021-11-19 13:42:16,297 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:42:16,297 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [433900435] [2021-11-19 13:42:16,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:16,297 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:42:16,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:42:16,298 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:42:16,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-19 13:42:16,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:16,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 13:42:16,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:16,439 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:16,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:16,518 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:16,518 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:42:16,518 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [433900435] [2021-11-19 13:42:16,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [433900435] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:42:16,519 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [520827989] [2021-11-19 13:42:16,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:16,519 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:42:16,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:42:16,521 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:42:16,534 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (6)] Waiting until timeout for monitored process [2021-11-19 13:42:16,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:16,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 13:42:16,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:16,645 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:16,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:16,702 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:16,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [520827989] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:42:16,703 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 13:42:16,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5] total 9 [2021-11-19 13:42:16,703 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620642810] [2021-11-19 13:42:16,703 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:42:16,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:42:16,704 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:42:16,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:42:16,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-19 13:42:16,705 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) [2021-11-19 13:42:16,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:42:16,817 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2021-11-19 13:42:16,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:42:16,819 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 [2021-11-19 13:42:16,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:42:16,819 INFO L225 Difference]: With dead ends: 41 [2021-11-19 13:42:16,820 INFO L226 Difference]: Without dead ends: 41 [2021-11-19 13:42:16,824 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 [2021-11-19 13:42:16,825 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 [2021-11-19 13:42:16,826 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] [2021-11-19 13:42:16,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-19 13:42:16,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-19 13:42:16,830 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) [2021-11-19 13:42:16,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2021-11-19 13:42:16,831 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 11 [2021-11-19 13:42:16,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:42:16,832 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2021-11-19 13:42:16,832 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) [2021-11-19 13:42:16,832 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2021-11-19 13:42:16,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-19 13:42:16,832 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:42:16,833 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:42:16,849 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:17,034 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (6)] Ended with exit code 0 [2021-11-19 13:42:17,233 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 13:42:17,233 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:42:17,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:42:17,234 INFO L85 PathProgramCache]: Analyzing trace with hash -1906083540, now seen corresponding path program 1 times [2021-11-19 13:42:17,235 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:42:17,235 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1563974908] [2021-11-19 13:42:17,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:17,235 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:42:17,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:42:17,236 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:42:17,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-19 13:42:17,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:17,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 13:42:17,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:17,359 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:17,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:17,429 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:17,430 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:42:17,430 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1563974908] [2021-11-19 13:42:17,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1563974908] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:42:17,430 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [966485676] [2021-11-19 13:42:17,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:17,430 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:42:17,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:42:17,431 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:42:17,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (8)] Waiting until timeout for monitored process [2021-11-19 13:42:17,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:17,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 13:42:17,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:17,576 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:17,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:17,611 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:17,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [966485676] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:42:17,612 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [496223090] [2021-11-19 13:42:17,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:17,612 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:42:17,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:42:17,616 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:42:17,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-19 13:42:17,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:17,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 13:42:17,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:17,723 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:17,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:17,769 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:17,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [496223090] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:42:17,769 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:42:17,770 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-19 13:42:17,770 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612480337] [2021-11-19 13:42:17,770 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:42:17,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 13:42:17,771 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:42:17,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 13:42:17,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-19 13:42:17,771 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) [2021-11-19 13:42:17,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:42:17,868 INFO L93 Difference]: Finished difference Result 77 states and 89 transitions. [2021-11-19 13:42:17,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-19 13:42:17,869 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 [2021-11-19 13:42:17,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:42:17,870 INFO L225 Difference]: With dead ends: 77 [2021-11-19 13:42:17,870 INFO L226 Difference]: Without dead ends: 77 [2021-11-19 13:42:17,871 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-19 13:42:17,872 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 [2021-11-19 13:42:17,872 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] [2021-11-19 13:42:17,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-19 13:42:17,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 48. [2021-11-19 13:42:17,878 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) [2021-11-19 13:42:17,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2021-11-19 13:42:17,880 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 11 [2021-11-19 13:42:17,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:42:17,880 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2021-11-19 13:42:17,880 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) [2021-11-19 13:42:17,880 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2021-11-19 13:42:17,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-19 13:42:17,881 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:42:17,881 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:42:17,893 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:18,094 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (8)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:18,314 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:18,503 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:42:18,503 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:42:18,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:42:18,504 INFO L85 PathProgramCache]: Analyzing trace with hash -1226025170, now seen corresponding path program 1 times [2021-11-19 13:42:18,504 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:42:18,504 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1898192499] [2021-11-19 13:42:18,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:18,505 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:42:18,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:42:18,506 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:42:18,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-19 13:42:18,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:18,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-19 13:42:18,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:18,679 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:42:18,679 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 [2021-11-19 13:42:18,689 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 [2021-11-19 13:42:20,049 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:20,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:20,783 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 114 treesize of output 112 [2021-11-19 13:42:20,889 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:20,889 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:42:20,889 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1898192499] [2021-11-19 13:42:20,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1898192499] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:42:20,890 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1945255781] [2021-11-19 13:42:20,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:20,890 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:42:20,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:42:20,891 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:42:20,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-19 13:42:21,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:21,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-19 13:42:21,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:21,134 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:42:21,134 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 [2021-11-19 13:42:21,140 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 [2021-11-19 13:42:22,229 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:22,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:22,491 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 [2021-11-19 13:42:22,556 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:22,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1945255781] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:42:22,556 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1293407044] [2021-11-19 13:42:22,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:22,557 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:42:22,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:42:22,563 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:42:22,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-19 13:42:22,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:22,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-19 13:42:22,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:22,691 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:42:22,692 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 [2021-11-19 13:42:22,696 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 [2021-11-19 13:42:23,696 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:23,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:23,914 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 [2021-11-19 13:42:23,998 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:23,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1293407044] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:42:23,999 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:42:23,999 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6, 6, 5, 5] total 14 [2021-11-19 13:42:23,999 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379907523] [2021-11-19 13:42:23,999 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:42:24,000 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-19 13:42:24,000 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:42:24,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-19 13:42:24,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=144, Unknown=0, NotChecked=0, Total=210 [2021-11-19 13:42:24,001 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) [2021-11-19 13:42:24,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:42:24,103 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2021-11-19 13:42:24,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 13:42:24,103 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 [2021-11-19 13:42:24,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:42:24,105 INFO L225 Difference]: With dead ends: 56 [2021-11-19 13:42:24,105 INFO L226 Difference]: Without dead ends: 56 [2021-11-19 13:42:24,105 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=73, Invalid=167, Unknown=0, NotChecked=0, Total=240 [2021-11-19 13:42:24,106 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 [2021-11-19 13:42:24,107 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] [2021-11-19 13:42:24,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-19 13:42:24,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-11-19 13:42:24,112 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) [2021-11-19 13:42:24,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 66 transitions. [2021-11-19 13:42:24,113 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 66 transitions. Word has length 11 [2021-11-19 13:42:24,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:42:24,114 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 66 transitions. [2021-11-19 13:42:24,114 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) [2021-11-19 13:42:24,114 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 66 transitions. [2021-11-19 13:42:24,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-19 13:42:24,115 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:42:24,115 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:42:24,140 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:24,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:24,537 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:24,736 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 13:42:24,736 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:42:24,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:42:24,737 INFO L85 PathProgramCache]: Analyzing trace with hash -2090265385, now seen corresponding path program 1 times [2021-11-19 13:42:24,737 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:42:24,737 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [491162930] [2021-11-19 13:42:24,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:24,737 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:42:24,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:42:24,738 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:42:24,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-19 13:42:24,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:24,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 13:42:24,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:24,838 INFO L354 Elim1Store]: treesize reduction 39, result has 29.1 percent of original size [2021-11-19 13:42:24,838 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 [2021-11-19 13:42:25,183 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:25,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:25,241 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:25,241 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:42:25,241 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [491162930] [2021-11-19 13:42:25,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [491162930] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:42:25,242 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:42:25,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 3 [2021-11-19 13:42:25,242 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769588937] [2021-11-19 13:42:25,242 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:42:25,243 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 13:42:25,244 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:42:25,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 13:42:25,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-19 13:42:25,244 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) [2021-11-19 13:42:25,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:42:25,300 INFO L93 Difference]: Finished difference Result 59 states and 71 transitions. [2021-11-19 13:42:25,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:42:25,301 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 [2021-11-19 13:42:25,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:42:25,301 INFO L225 Difference]: With dead ends: 59 [2021-11-19 13:42:25,301 INFO L226 Difference]: Without dead ends: 59 [2021-11-19 13:42:25,302 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 [2021-11-19 13:42:25,303 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, 0.0s IncrementalHoareTripleChecker+Time [2021-11-19 13:42:25,303 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 64 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 4 Unchecked, 0.0s Time] [2021-11-19 13:42:25,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-19 13:42:25,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-11-19 13:42:25,307 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) [2021-11-19 13:42:25,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 70 transitions. [2021-11-19 13:42:25,308 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 70 transitions. Word has length 13 [2021-11-19 13:42:25,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:42:25,309 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 70 transitions. [2021-11-19 13:42:25,309 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) [2021-11-19 13:42:25,309 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 70 transitions. [2021-11-19 13:42:25,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-19 13:42:25,310 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:42:25,310 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:42:25,332 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:25,528 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:42:25,528 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:42:25,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:42:25,529 INFO L85 PathProgramCache]: Analyzing trace with hash -2090265384, now seen corresponding path program 1 times [2021-11-19 13:42:25,529 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:42:25,529 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [439097148] [2021-11-19 13:42:25,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:25,530 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:42:25,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:42:25,531 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:42:25,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-19 13:42:25,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:25,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-19 13:42:25,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:25,641 INFO L354 Elim1Store]: treesize reduction 44, result has 27.9 percent of original size [2021-11-19 13:42:25,641 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 [2021-11-19 13:42:25,646 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 [2021-11-19 13:42:27,879 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:27,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:28,181 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 [2021-11-19 13:42:28,211 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:28,211 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:42:28,212 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [439097148] [2021-11-19 13:42:28,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [439097148] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:42:28,212 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:42:28,212 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2021-11-19 13:42:28,212 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163629242] [2021-11-19 13:42:28,212 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:42:28,213 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 13:42:28,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:42:28,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 13:42:28,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-19 13:42:28,214 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) [2021-11-19 13:42:30,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:42:30,596 INFO L93 Difference]: Finished difference Result 82 states and 98 transitions. [2021-11-19 13:42:30,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-19 13:42:30,597 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 [2021-11-19 13:42:30,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:42:30,598 INFO L225 Difference]: With dead ends: 82 [2021-11-19 13:42:30,598 INFO L226 Difference]: Without dead ends: 82 [2021-11-19 13:42:30,599 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 [2021-11-19 13:42:30,600 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, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 13:42:30,600 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 193 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 21 Unchecked, 0.3s Time] [2021-11-19 13:42:30,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-19 13:42:30,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 58. [2021-11-19 13:42:30,605 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) [2021-11-19 13:42:30,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 69 transitions. [2021-11-19 13:42:30,606 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 69 transitions. Word has length 13 [2021-11-19 13:42:30,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:42:30,607 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 69 transitions. [2021-11-19 13:42:30,607 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) [2021-11-19 13:42:30,607 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 69 transitions. [2021-11-19 13:42:30,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-19 13:42:30,608 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:42:30,608 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:42:30,619 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:30,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:42:30,809 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)] === [2021-11-19 13:42:30,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:42:30,809 INFO L85 PathProgramCache]: Analyzing trace with hash 1633190459, now seen corresponding path program 1 times [2021-11-19 13:42:30,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:42:30,810 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2060658657] [2021-11-19 13:42:30,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:30,810 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:42:30,810 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:42:30,811 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:42:30,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-19 13:42:30,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:30,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-19 13:42:30,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:30,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:30,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:30,986 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:30,987 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:42:30,987 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2060658657] [2021-11-19 13:42:30,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2060658657] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:42:30,987 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:42:30,987 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-19 13:42:30,987 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072803952] [2021-11-19 13:42:30,987 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:42:30,988 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-19 13:42:30,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:42:30,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-19 13:42:30,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-19 13:42:30,988 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) [2021-11-19 13:42:31,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:42:31,093 INFO L93 Difference]: Finished difference Result 113 states and 130 transitions. [2021-11-19 13:42:31,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-19 13:42:31,094 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 [2021-11-19 13:42:31,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:42:31,095 INFO L225 Difference]: With dead ends: 113 [2021-11-19 13:42:31,095 INFO L226 Difference]: Without dead ends: 113 [2021-11-19 13:42:31,095 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 [2021-11-19 13:42:31,096 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 [2021-11-19 13:42:31,096 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] [2021-11-19 13:42:31,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-19 13:42:31,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 58. [2021-11-19 13:42:31,108 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) [2021-11-19 13:42:31,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2021-11-19 13:42:31,110 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 16 [2021-11-19 13:42:31,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:42:31,110 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2021-11-19 13:42:31,111 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) [2021-11-19 13:42:31,111 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2021-11-19 13:42:31,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-19 13:42:31,112 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:42:31,112 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:42:31,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:31,326 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:42:31,326 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:42:31,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:42:31,327 INFO L85 PathProgramCache]: Analyzing trace with hash -862198758, now seen corresponding path program 1 times [2021-11-19 13:42:31,327 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:42:31,327 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1338655761] [2021-11-19 13:42:31,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:31,327 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:42:31,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:42:31,328 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:42:31,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-19 13:42:31,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:31,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 13:42:31,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:31,476 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:31,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:31,567 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:31,568 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:42:31,568 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1338655761] [2021-11-19 13:42:31,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1338655761] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:42:31,568 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [526343345] [2021-11-19 13:42:31,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:31,568 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:42:31,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:42:31,570 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:42:31,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-19 13:42:31,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:31,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 13:42:31,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:31,694 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:31,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:31,724 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:31,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [526343345] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:42:31,725 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-19 13:42:31,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5] total 9 [2021-11-19 13:42:31,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760294121] [2021-11-19 13:42:31,725 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:42:31,726 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:42:31,726 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:42:31,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:42:31,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-19 13:42:31,727 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) [2021-11-19 13:42:31,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:42:31,830 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-11-19 13:42:31,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:42:31,830 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 [2021-11-19 13:42:31,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:42:31,831 INFO L225 Difference]: With dead ends: 57 [2021-11-19 13:42:31,831 INFO L226 Difference]: Without dead ends: 57 [2021-11-19 13:42:31,831 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-19 13:42:31,832 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 [2021-11-19 13:42:31,832 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] [2021-11-19 13:42:31,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-19 13:42:31,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-11-19 13:42:31,836 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) [2021-11-19 13:42:31,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-11-19 13:42:31,837 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 17 [2021-11-19 13:42:31,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:42:31,837 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-11-19 13:42:31,837 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) [2021-11-19 13:42:31,837 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-11-19 13:42:31,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-19 13:42:31,838 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:42:31,838 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:42:31,856 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:32,057 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:32,253 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 13:42:32,253 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:42:32,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:42:32,253 INFO L85 PathProgramCache]: Analyzing trace with hash -862198757, now seen corresponding path program 1 times [2021-11-19 13:42:32,254 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:42:32,254 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [996662529] [2021-11-19 13:42:32,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:32,254 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:42:32,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:42:32,255 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:42:32,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-19 13:42:32,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:32,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 13:42:32,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:32,369 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:32,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:32,443 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:32,444 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:42:32,444 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [996662529] [2021-11-19 13:42:32,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [996662529] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:42:32,444 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [102132756] [2021-11-19 13:42:32,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:32,445 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:42:32,445 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:42:32,446 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:42:32,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-19 13:42:32,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:32,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 13:42:32,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:32,621 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:32,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:32,664 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:32,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [102132756] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:42:32,664 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [554775541] [2021-11-19 13:42:32,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:32,664 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:42:32,665 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:42:32,665 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:42:32,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-19 13:42:32,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:32,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 13:42:32,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:32,787 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:32,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:32,841 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:32,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [554775541] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:42:32,842 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:42:32,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-19 13:42:32,846 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433902575] [2021-11-19 13:42:32,847 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:42:32,847 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 13:42:32,848 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:42:32,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 13:42:32,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-19 13:42:32,849 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) [2021-11-19 13:42:32,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:42:32,929 INFO L93 Difference]: Finished difference Result 107 states and 123 transitions. [2021-11-19 13:42:32,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-19 13:42:32,931 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 [2021-11-19 13:42:32,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:42:32,931 INFO L225 Difference]: With dead ends: 107 [2021-11-19 13:42:32,931 INFO L226 Difference]: Without dead ends: 107 [2021-11-19 13:42:32,932 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 [2021-11-19 13:42:32,932 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 [2021-11-19 13:42:32,933 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] [2021-11-19 13:42:32,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-19 13:42:32,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 84. [2021-11-19 13:42:32,947 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) [2021-11-19 13:42:32,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 98 transitions. [2021-11-19 13:42:32,952 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 98 transitions. Word has length 17 [2021-11-19 13:42:32,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:42:32,953 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 98 transitions. [2021-11-19 13:42:32,953 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) [2021-11-19 13:42:32,953 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 98 transitions. [2021-11-19 13:42:32,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-19 13:42:32,954 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:42:32,954 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:42:32,962 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (19)] Ended with exit code 0 [2021-11-19 13:42:33,194 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:33,370 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (18)] Ended with exit code 0 [2021-11-19 13:42:33,563 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:42:33,563 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:42:33,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:42:33,564 INFO L85 PathProgramCache]: Analyzing trace with hash -1873316007, now seen corresponding path program 1 times [2021-11-19 13:42:33,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:42:33,564 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [899893714] [2021-11-19 13:42:33,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:33,564 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:42:33,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:42:33,565 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:42:33,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-19 13:42:33,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:33,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-19 13:42:33,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:33,706 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:42:33,707 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 [2021-11-19 13:42:33,710 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 [2021-11-19 13:42:40,451 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:40,451 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:41,085 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 [2021-11-19 13:42:41,139 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:41,140 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:42:41,140 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [899893714] [2021-11-19 13:42:41,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [899893714] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:42:41,140 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1256169581] [2021-11-19 13:42:41,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:41,140 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:42:41,140 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:42:41,142 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:42:41,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-19 13:42:41,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:41,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-19 13:42:41,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:41,362 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:42:41,363 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 [2021-11-19 13:42:41,367 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 [2021-11-19 13:42:44,707 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:44,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:45,033 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 [2021-11-19 13:42:45,046 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:45,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1256169581] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:42:45,047 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [662739496] [2021-11-19 13:42:45,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:42:45,047 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:42:45,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:42:45,055 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:42:45,077 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-19 13:42:45,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:42:45,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-19 13:42:45,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:45,193 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:42:45,194 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 [2021-11-19 13:42:45,202 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 [2021-11-19 13:42:45,619 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:45,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:45,906 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 [2021-11-19 13:42:45,924 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:42:45,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [662739496] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:42:45,924 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:42:45,924 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 15 [2021-11-19 13:42:45,925 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739399741] [2021-11-19 13:42:45,925 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:42:45,925 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-19 13:42:45,925 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:42:45,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-19 13:42:45,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=165, Unknown=0, NotChecked=0, Total=240 [2021-11-19 13:42:45,926 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) [2021-11-19 13:42:50,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:42:50,572 INFO L93 Difference]: Finished difference Result 92 states and 108 transitions. [2021-11-19 13:42:50,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-19 13:42:50,573 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 [2021-11-19 13:42:50,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:42:50,574 INFO L225 Difference]: With dead ends: 92 [2021-11-19 13:42:50,574 INFO L226 Difference]: Without dead ends: 92 [2021-11-19 13:42:50,574 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=91, Invalid=215, Unknown=0, NotChecked=0, Total=306 [2021-11-19 13:42:50,575 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 13 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s 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, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 13:42:50,575 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 183 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 55 Invalid, 0 Unknown, 26 Unchecked, 0.5s Time] [2021-11-19 13:42:50,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-19 13:42:50,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-11-19 13:42:50,580 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) [2021-11-19 13:42:50,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 108 transitions. [2021-11-19 13:42:50,581 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 108 transitions. Word has length 17 [2021-11-19 13:42:50,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:42:50,582 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 108 transitions. [2021-11-19 13:42:50,582 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) [2021-11-19 13:42:50,582 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 108 transitions. [2021-11-19 13:42:50,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-19 13:42:50,583 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:42:50,584 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1] [2021-11-19 13:42:50,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:50,801 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:51,006 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-19 13:42:51,199 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:42:51,199 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:42:51,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:42:51,200 INFO L85 PathProgramCache]: Analyzing trace with hash -472171212, now seen corresponding path program 2 times [2021-11-19 13:42:51,200 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:42:51,200 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [818411025] [2021-11-19 13:42:51,200 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:42:51,200 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:42:51,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:42:51,201 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:42:51,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-19 13:42:51,264 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:42:51,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:42:51,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-19 13:42:51,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:51,344 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-19 13:42:51,344 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 [2021-11-19 13:42:51,351 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:42:51,351 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 [2021-11-19 13:42:53,122 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:53,122 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:54,126 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:42:54,127 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 [2021-11-19 13:42:54,197 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:54,198 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:42:54,198 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [818411025] [2021-11-19 13:42:54,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [818411025] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:42:54,198 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [861077695] [2021-11-19 13:42:54,198 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:42:54,198 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:42:54,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:42:54,199 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:42:54,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-19 13:42:54,293 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:42:54,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:42:54,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-19 13:42:54,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:54,437 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-19 13:42:54,438 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 [2021-11-19 13:42:54,447 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:42:54,447 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 [2021-11-19 13:42:56,094 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:56,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:56,616 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:42:56,617 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 [2021-11-19 13:42:56,639 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:56,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [861077695] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:42:56,639 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267172160] [2021-11-19 13:42:56,639 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:42:56,640 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:42:56,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:42:56,647 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:42:56,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-19 13:42:56,722 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:42:56,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:42:56,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-19 13:42:56,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:42:56,802 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-19 13:42:56,803 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 [2021-11-19 13:42:56,813 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:42:56,813 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 [2021-11-19 13:42:58,110 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:58,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:42:58,512 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:42:58,513 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 [2021-11-19 13:42:58,535 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:42:58,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1267172160] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:42:58,536 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:42:58,536 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 18 [2021-11-19 13:42:58,536 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795396139] [2021-11-19 13:42:58,537 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:42:58,537 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-19 13:42:58,537 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:42:58,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-19 13:42:58,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=244, Unknown=0, NotChecked=0, Total=342 [2021-11-19 13:42:58,538 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) [2021-11-19 13:43:00,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:00,670 INFO L93 Difference]: Finished difference Result 124 states and 148 transitions. [2021-11-19 13:43:00,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-19 13:43:00,671 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 [2021-11-19 13:43:00,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:00,672 INFO L225 Difference]: With dead ends: 124 [2021-11-19 13:43:00,672 INFO L226 Difference]: Without dead ends: 124 [2021-11-19 13:43:00,673 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=219, Invalid=537, Unknown=0, NotChecked=0, Total=756 [2021-11-19 13:43:00,673 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, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 13:43:00,674 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 293 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 63 Invalid, 0 Unknown, 77 Unchecked, 0.6s Time] [2021-11-19 13:43:00,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-19 13:43:00,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2021-11-19 13:43:00,679 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) [2021-11-19 13:43:00,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 148 transitions. [2021-11-19 13:43:00,680 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 148 transitions. Word has length 19 [2021-11-19 13:43:00,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:00,681 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 148 transitions. [2021-11-19 13:43:00,681 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) [2021-11-19 13:43:00,681 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 148 transitions. [2021-11-19 13:43:00,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-19 13:43:00,682 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:00,682 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] [2021-11-19 13:43:00,696 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:00,894 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:01,114 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2021-11-19 13:43:01,293 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:43:01,293 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)] === [2021-11-19 13:43:01,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:01,294 INFO L85 PathProgramCache]: Analyzing trace with hash -1860319208, now seen corresponding path program 1 times [2021-11-19 13:43:01,294 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:43:01,294 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2101540381] [2021-11-19 13:43:01,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:01,294 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:43:01,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:43:01,295 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:43:01,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-19 13:43:01,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:01,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-19 13:43:01,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:01,399 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:43:01,399 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:01,449 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:43:01,449 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:43:01,449 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2101540381] [2021-11-19 13:43:01,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2101540381] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:43:01,449 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:43:01,450 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-19 13:43:01,450 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261197155] [2021-11-19 13:43:01,450 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:43:01,450 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-19 13:43:01,450 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:43:01,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-19 13:43:01,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-19 13:43:01,451 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) [2021-11-19 13:43:01,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:01,568 INFO L93 Difference]: Finished difference Result 187 states and 220 transitions. [2021-11-19 13:43:01,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-19 13:43:01,569 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 [2021-11-19 13:43:01,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:01,570 INFO L225 Difference]: With dead ends: 187 [2021-11-19 13:43:01,571 INFO L226 Difference]: Without dead ends: 187 [2021-11-19 13:43:01,571 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 [2021-11-19 13:43:01,572 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 [2021-11-19 13:43:01,572 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] [2021-11-19 13:43:01,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-11-19 13:43:01,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 125. [2021-11-19 13:43:01,577 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) [2021-11-19 13:43:01,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 149 transitions. [2021-11-19 13:43:01,579 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 149 transitions. Word has length 20 [2021-11-19 13:43:01,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:01,579 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 149 transitions. [2021-11-19 13:43:01,579 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) [2021-11-19 13:43:01,580 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 149 transitions. [2021-11-19 13:43:01,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-19 13:43:01,581 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:01,581 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] [2021-11-19 13:43:01,596 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:01,792 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:43:01,792 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:43:01,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:01,793 INFO L85 PathProgramCache]: Analyzing trace with hash -1860318342, now seen corresponding path program 1 times [2021-11-19 13:43:01,793 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:43:01,793 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [106583657] [2021-11-19 13:43:01,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:01,793 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:43:01,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:43:01,794 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:43:01,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-19 13:43:01,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:01,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 13:43:01,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:01,931 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:01,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:01,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:01,975 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:43:01,975 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [106583657] [2021-11-19 13:43:01,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [106583657] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:43:01,975 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:43:01,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-19 13:43:01,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769062587] [2021-11-19 13:43:01,976 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:43:01,976 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 13:43:01,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:43:01,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 13:43:01,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 13:43:01,976 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) [2021-11-19 13:43:02,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:02,089 INFO L93 Difference]: Finished difference Result 123 states and 147 transitions. [2021-11-19 13:43:02,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 13:43:02,090 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 [2021-11-19 13:43:02,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:02,091 INFO L225 Difference]: With dead ends: 123 [2021-11-19 13:43:02,091 INFO L226 Difference]: Without dead ends: 123 [2021-11-19 13:43:02,092 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 [2021-11-19 13:43:02,092 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 [2021-11-19 13:43:02,093 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] [2021-11-19 13:43:02,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-19 13:43:02,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2021-11-19 13:43:02,097 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) [2021-11-19 13:43:02,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 147 transitions. [2021-11-19 13:43:02,098 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 147 transitions. Word has length 20 [2021-11-19 13:43:02,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:02,099 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 147 transitions. [2021-11-19 13:43:02,099 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) [2021-11-19 13:43:02,099 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 147 transitions. [2021-11-19 13:43:02,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-19 13:43:02,100 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:02,101 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] [2021-11-19 13:43:02,115 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:02,311 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:43:02,311 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:43:02,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:02,312 INFO L85 PathProgramCache]: Analyzing trace with hash -1860318341, now seen corresponding path program 1 times [2021-11-19 13:43:02,312 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:43:02,312 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1182939585] [2021-11-19 13:43:02,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:02,313 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:43:02,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:43:02,314 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:43:02,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-19 13:43:02,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:02,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-19 13:43:02,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:02,496 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:02,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:02,802 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 [2021-11-19 13:43:02,888 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:02,888 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:43:02,888 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1182939585] [2021-11-19 13:43:02,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1182939585] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:02,890 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1841858367] [2021-11-19 13:43:02,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:02,890 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:43:02,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:43:02,898 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:43:02,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-19 13:43:03,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:03,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-19 13:43:03,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:03,149 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:03,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:03,327 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 25 treesize of output 21 [2021-11-19 13:43:03,375 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:03,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1841858367] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:03,375 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1070272990] [2021-11-19 13:43:03,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:03,376 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:43:03,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:43:03,377 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:43:03,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-19 13:43:03,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:03,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-19 13:43:03,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:03,570 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:03,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:03,739 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 [2021-11-19 13:43:03,778 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:03,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1070272990] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:03,779 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:43:03,779 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 7 [2021-11-19 13:43:03,779 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671005739] [2021-11-19 13:43:03,779 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:43:03,779 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 13:43:03,780 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:43:03,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 13:43:03,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-19 13:43:03,780 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) [2021-11-19 13:43:04,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:04,601 INFO L93 Difference]: Finished difference Result 202 states and 242 transitions. [2021-11-19 13:43:04,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-19 13:43:04,602 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 [2021-11-19 13:43:04,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:04,603 INFO L225 Difference]: With dead ends: 202 [2021-11-19 13:43:04,604 INFO L226 Difference]: Without dead ends: 202 [2021-11-19 13:43:04,604 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 [2021-11-19 13:43:04,605 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, 0.5s IncrementalHoareTripleChecker+Time [2021-11-19 13:43:04,605 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 102 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-19 13:43:04,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-11-19 13:43:04,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 127. [2021-11-19 13:43:04,610 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) [2021-11-19 13:43:04,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 153 transitions. [2021-11-19 13:43:04,611 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 153 transitions. Word has length 20 [2021-11-19 13:43:04,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:04,611 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 153 transitions. [2021-11-19 13:43:04,611 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) [2021-11-19 13:43:04,612 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 153 transitions. [2021-11-19 13:43:04,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-19 13:43:04,612 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:04,613 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] [2021-11-19 13:43:04,628 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (29)] Ended with exit code 0 [2021-11-19 13:43:04,844 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2021-11-19 13:43:05,026 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:05,224 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 13:43:05,224 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:43:05,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:05,225 INFO L85 PathProgramCache]: Analyzing trace with hash -1835293711, now seen corresponding path program 1 times [2021-11-19 13:43:05,225 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:43:05,225 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1753991598] [2021-11-19 13:43:05,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:05,225 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:43:05,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:43:05,226 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:43:05,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-19 13:43:05,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:05,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-19 13:43:05,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:05,328 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:05,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:05,362 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:05,362 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:43:05,362 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1753991598] [2021-11-19 13:43:05,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1753991598] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:43:05,362 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:43:05,362 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-19 13:43:05,362 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677688112] [2021-11-19 13:43:05,363 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:43:05,363 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 13:43:05,363 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:43:05,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 13:43:05,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 13:43:05,363 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) [2021-11-19 13:43:05,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:05,453 INFO L93 Difference]: Finished difference Result 126 states and 152 transitions. [2021-11-19 13:43:05,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 13:43:05,454 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 [2021-11-19 13:43:05,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:05,455 INFO L225 Difference]: With dead ends: 126 [2021-11-19 13:43:05,455 INFO L226 Difference]: Without dead ends: 126 [2021-11-19 13:43:05,455 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 [2021-11-19 13:43:05,456 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 [2021-11-19 13:43:05,456 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] [2021-11-19 13:43:05,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-19 13:43:05,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2021-11-19 13:43:05,459 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) [2021-11-19 13:43:05,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 152 transitions. [2021-11-19 13:43:05,460 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 152 transitions. Word has length 21 [2021-11-19 13:43:05,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:05,461 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 152 transitions. [2021-11-19 13:43:05,461 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) [2021-11-19 13:43:05,461 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 152 transitions. [2021-11-19 13:43:05,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-19 13:43:05,462 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:05,462 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] [2021-11-19 13:43:05,473 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:05,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:43:05,673 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:43:05,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:05,673 INFO L85 PathProgramCache]: Analyzing trace with hash -1835293710, now seen corresponding path program 1 times [2021-11-19 13:43:05,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:43:05,674 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [880847000] [2021-11-19 13:43:05,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:05,674 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:43:05,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:43:05,675 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:43:05,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-19 13:43:05,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:05,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-19 13:43:05,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:05,897 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:05,897 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:06,273 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 [2021-11-19 13:43:06,434 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:06,434 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:43:06,434 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [880847000] [2021-11-19 13:43:06,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [880847000] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:06,434 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2009856467] [2021-11-19 13:43:06,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:06,435 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:43:06,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:43:06,463 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:43:06,464 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-19 13:43:06,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:06,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-19 13:43:06,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:06,684 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:06,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:06,835 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 [2021-11-19 13:43:06,898 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:06,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2009856467] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:06,898 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [361328235] [2021-11-19 13:43:06,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:06,898 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:43:06,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:43:06,899 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:43:06,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-19 13:43:06,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:06,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-19 13:43:06,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:07,061 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:07,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:07,246 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 [2021-11-19 13:43:07,339 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:07,339 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [361328235] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:07,339 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:43:07,339 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 11 [2021-11-19 13:43:07,339 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230355448] [2021-11-19 13:43:07,340 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:43:07,340 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-19 13:43:07,340 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:43:07,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-19 13:43:07,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-19 13:43:07,341 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) [2021-11-19 13:43:08,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:08,321 INFO L93 Difference]: Finished difference Result 208 states and 249 transitions. [2021-11-19 13:43:08,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-19 13:43:08,322 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 [2021-11-19 13:43:08,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:08,323 INFO L225 Difference]: With dead ends: 208 [2021-11-19 13:43:08,324 INFO L226 Difference]: Without dead ends: 208 [2021-11-19 13:43:08,324 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=122, Invalid=258, Unknown=0, NotChecked=0, Total=380 [2021-11-19 13:43:08,325 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 293 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s 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, 0.6s IncrementalHoareTripleChecker+Time [2021-11-19 13:43:08,325 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [293 Valid, 143 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-19 13:43:08,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-11-19 13:43:08,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 129. [2021-11-19 13:43:08,329 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) [2021-11-19 13:43:08,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 156 transitions. [2021-11-19 13:43:08,330 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 156 transitions. Word has length 21 [2021-11-19 13:43:08,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:08,331 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 156 transitions. [2021-11-19 13:43:08,331 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) [2021-11-19 13:43:08,331 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 156 transitions. [2021-11-19 13:43:08,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-19 13:43:08,332 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:08,332 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] [2021-11-19 13:43:08,366 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:08,556 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:08,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:08,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:43:08,955 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:43:08,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:08,956 INFO L85 PathProgramCache]: Analyzing trace with hash -1059572912, now seen corresponding path program 1 times [2021-11-19 13:43:08,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:43:08,956 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [224020373] [2021-11-19 13:43:08,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:08,956 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:43:08,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:43:08,959 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:43:09,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-19 13:43:09,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:09,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-19 13:43:09,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:09,130 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:43:09,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:09,203 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:43:09,203 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:43:09,203 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [224020373] [2021-11-19 13:43:09,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [224020373] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:43:09,203 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:43:09,203 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2021-11-19 13:43:09,204 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216159566] [2021-11-19 13:43:09,204 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:43:09,204 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 13:43:09,204 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:43:09,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 13:43:09,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-19 13:43:09,205 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) [2021-11-19 13:43:09,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:09,369 INFO L93 Difference]: Finished difference Result 156 states and 185 transitions. [2021-11-19 13:43:09,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 13:43:09,370 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 [2021-11-19 13:43:09,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:09,371 INFO L225 Difference]: With dead ends: 156 [2021-11-19 13:43:09,371 INFO L226 Difference]: Without dead ends: 156 [2021-11-19 13:43:09,372 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 [2021-11-19 13:43:09,372 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 [2021-11-19 13:43:09,373 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] [2021-11-19 13:43:09,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-11-19 13:43:09,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 127. [2021-11-19 13:43:09,376 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) [2021-11-19 13:43:09,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 152 transitions. [2021-11-19 13:43:09,377 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 152 transitions. Word has length 22 [2021-11-19 13:43:09,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:09,377 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 152 transitions. [2021-11-19 13:43:09,377 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) [2021-11-19 13:43:09,377 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 152 transitions. [2021-11-19 13:43:09,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-19 13:43:09,378 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:09,378 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] [2021-11-19 13:43:09,395 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:09,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:43:09,595 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:43:09,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:09,595 INFO L85 PathProgramCache]: Analyzing trace with hash -747793046, now seen corresponding path program 1 times [2021-11-19 13:43:09,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:43:09,596 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1847748095] [2021-11-19 13:43:09,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:09,596 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:43:09,596 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:43:09,596 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:43:09,598 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-19 13:43:09,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:09,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-19 13:43:09,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:09,759 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:43:09,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:09,844 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:43:09,844 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:43:09,844 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1847748095] [2021-11-19 13:43:09,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1847748095] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:09,844 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1897205326] [2021-11-19 13:43:09,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:09,845 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:43:09,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:43:09,845 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:43:09,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-19 13:43:09,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:09,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-19 13:43:09,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:10,008 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:43:10,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:10,062 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:43:10,063 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1897205326] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:10,063 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [214408021] [2021-11-19 13:43:10,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:10,063 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:43:10,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:43:10,064 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:43:10,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-19 13:43:10,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:10,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-19 13:43:10,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:10,198 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:43:10,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:10,268 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:43:10,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [214408021] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:10,268 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:43:10,268 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 10 [2021-11-19 13:43:10,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377296967] [2021-11-19 13:43:10,269 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:43:10,269 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-19 13:43:10,269 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:43:10,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-19 13:43:10,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-19 13:43:10,270 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) [2021-11-19 13:43:10,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:10,413 INFO L93 Difference]: Finished difference Result 161 states and 189 transitions. [2021-11-19 13:43:10,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-19 13:43:10,414 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 [2021-11-19 13:43:10,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:10,415 INFO L225 Difference]: With dead ends: 161 [2021-11-19 13:43:10,415 INFO L226 Difference]: Without dead ends: 161 [2021-11-19 13:43:10,415 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 [2021-11-19 13:43:10,416 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 [2021-11-19 13:43:10,416 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] [2021-11-19 13:43:10,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-11-19 13:43:10,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 143. [2021-11-19 13:43:10,420 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) [2021-11-19 13:43:10,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 175 transitions. [2021-11-19 13:43:10,420 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 175 transitions. Word has length 25 [2021-11-19 13:43:10,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:10,421 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 175 transitions. [2021-11-19 13:43:10,421 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) [2021-11-19 13:43:10,421 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 175 transitions. [2021-11-19 13:43:10,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-19 13:43:10,422 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:10,422 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] [2021-11-19 13:43:10,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:10,630 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (38)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:10,830 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:11,022 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:43:11,023 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:43:11,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:11,023 INFO L85 PathProgramCache]: Analyzing trace with hash -528938328, now seen corresponding path program 1 times [2021-11-19 13:43:11,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:43:11,024 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [442136628] [2021-11-19 13:43:11,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:11,024 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:43:11,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:43:11,025 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:43:11,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-19 13:43:11,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:11,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-19 13:43:11,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:11,319 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:11,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:11,499 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:11,499 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:43:11,499 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [442136628] [2021-11-19 13:43:11,500 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [442136628] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:11,500 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1688517759] [2021-11-19 13:43:11,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:11,500 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:43:11,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:43:11,501 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:43:11,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-19 13:43:11,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:11,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-19 13:43:11,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:11,831 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:11,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:11,917 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:11,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1688517759] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:11,917 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1237117889] [2021-11-19 13:43:11,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:11,917 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:43:11,917 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:43:11,918 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:43:11,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-19 13:43:11,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:11,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-19 13:43:11,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:12,079 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:12,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:12,150 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:12,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1237117889] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:12,151 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:43:12,151 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9, 8, 9, 8] total 22 [2021-11-19 13:43:12,151 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133452219] [2021-11-19 13:43:12,151 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:43:12,152 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-19 13:43:12,152 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:43:12,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-19 13:43:12,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2021-11-19 13:43:12,153 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) [2021-11-19 13:43:12,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:12,524 INFO L93 Difference]: Finished difference Result 183 states and 222 transitions. [2021-11-19 13:43:12,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-19 13:43:12,525 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 [2021-11-19 13:43:12,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:12,526 INFO L225 Difference]: With dead ends: 183 [2021-11-19 13:43:12,527 INFO L226 Difference]: Without dead ends: 183 [2021-11-19 13:43:12,527 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 [2021-11-19 13:43:12,528 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, 0.2s IncrementalHoareTripleChecker+Time [2021-11-19 13:43:12,528 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [318 Valid, 389 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-19 13:43:12,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-11-19 13:43:12,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 143. [2021-11-19 13:43:12,532 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) [2021-11-19 13:43:12,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 175 transitions. [2021-11-19 13:43:12,533 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 175 transitions. Word has length 25 [2021-11-19 13:43:12,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:12,534 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 175 transitions. [2021-11-19 13:43:12,534 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) [2021-11-19 13:43:12,534 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 175 transitions. [2021-11-19 13:43:12,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-19 13:43:12,535 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:12,535 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:43:12,547 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (40)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:12,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (41)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:12,963 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:13,143 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:43:13,143 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:43:13,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:13,144 INFO L85 PathProgramCache]: Analyzing trace with hash -1117279393, now seen corresponding path program 2 times [2021-11-19 13:43:13,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:43:13,144 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [353737054] [2021-11-19 13:43:13,144 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:43:13,144 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:43:13,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:43:13,145 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:43:13,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-19 13:43:13,206 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:43:13,206 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:43:13,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-19 13:43:13,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:13,264 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:43:13,264 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 [2021-11-19 13:43:13,269 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 [2021-11-19 13:43:21,550 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:21,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:22,949 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 [2021-11-19 13:43:23,046 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:23,046 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:43:23,047 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [353737054] [2021-11-19 13:43:23,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [353737054] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:23,047 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [809818491] [2021-11-19 13:43:23,047 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:43:23,047 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:43:23,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:43:23,051 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:43:23,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-19 13:43:23,151 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:43:23,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:43:23,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-19 13:43:23,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:23,218 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:43:23,218 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 [2021-11-19 13:43:23,221 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 [2021-11-19 13:43:27,981 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:27,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:29,010 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 [2021-11-19 13:43:29,103 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:29,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [809818491] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:29,104 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [361646045] [2021-11-19 13:43:29,104 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:43:29,104 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:43:29,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:43:29,105 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:43:29,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-19 13:43:29,157 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:43:29,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:43:29,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-19 13:43:29,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:29,211 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:43:29,212 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 [2021-11-19 13:43:29,215 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 [2021-11-19 13:43:29,884 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:29,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:30,413 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 33 treesize of output 31 [2021-11-19 13:43:30,430 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:30,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [361646045] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:30,430 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:43:30,430 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 8, 8, 8] total 22 [2021-11-19 13:43:30,430 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502721481] [2021-11-19 13:43:30,431 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:43:30,431 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-19 13:43:30,431 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:43:30,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-19 13:43:30,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=359, Unknown=0, NotChecked=0, Total=506 [2021-11-19 13:43:30,432 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) [2021-11-19 13:43:34,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:34,423 INFO L93 Difference]: Finished difference Result 159 states and 195 transitions. [2021-11-19 13:43:34,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-19 13:43:34,425 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 [2021-11-19 13:43:34,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:34,426 INFO L225 Difference]: With dead ends: 159 [2021-11-19 13:43:34,426 INFO L226 Difference]: Without dead ends: 159 [2021-11-19 13:43:34,426 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 125 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=299, Invalid=757, Unknown=0, NotChecked=0, Total=1056 [2021-11-19 13:43:34,427 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 32 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s 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, 0.7s IncrementalHoareTripleChecker+Time [2021-11-19 13:43:34,427 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 260 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 105 Invalid, 0 Unknown, 21 Unchecked, 0.7s Time] [2021-11-19 13:43:34,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-11-19 13:43:34,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2021-11-19 13:43:34,431 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) [2021-11-19 13:43:34,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 195 transitions. [2021-11-19 13:43:34,432 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 195 transitions. Word has length 25 [2021-11-19 13:43:34,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:34,433 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 195 transitions. [2021-11-19 13:43:34,433 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) [2021-11-19 13:43:34,433 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 195 transitions. [2021-11-19 13:43:34,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-19 13:43:34,434 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:34,434 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] [2021-11-19 13:43:34,457 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:34,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (44)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:34,846 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:35,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:43:35,040 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:43:35,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:35,040 INFO L85 PathProgramCache]: Analyzing trace with hash -1706790696, now seen corresponding path program 1 times [2021-11-19 13:43:35,040 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:43:35,040 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1586894527] [2021-11-19 13:43:35,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:35,040 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:43:35,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:43:35,041 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:43:35,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-19 13:43:35,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:35,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-19 13:43:35,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:35,154 INFO L354 Elim1Store]: treesize reduction 39, result has 29.1 percent of original size [2021-11-19 13:43:35,155 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 [2021-11-19 13:43:35,234 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:43:35,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:35,291 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:43:35,291 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:43:35,292 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1586894527] [2021-11-19 13:43:35,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1586894527] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:43:35,292 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:43:35,292 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-19 13:43:35,292 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374280646] [2021-11-19 13:43:35,292 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:43:35,292 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 13:43:35,292 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:43:35,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 13:43:35,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 13:43:35,293 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) [2021-11-19 13:43:35,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:35,370 INFO L93 Difference]: Finished difference Result 158 states and 193 transitions. [2021-11-19 13:43:35,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-19 13:43:35,375 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 [2021-11-19 13:43:35,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:35,376 INFO L225 Difference]: With dead ends: 158 [2021-11-19 13:43:35,376 INFO L226 Difference]: Without dead ends: 158 [2021-11-19 13:43:35,376 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 [2021-11-19 13:43:35,377 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 [2021-11-19 13:43:35,377 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] [2021-11-19 13:43:35,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-11-19 13:43:35,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 158. [2021-11-19 13:43:35,382 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) [2021-11-19 13:43:35,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 193 transitions. [2021-11-19 13:43:35,383 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 193 transitions. Word has length 26 [2021-11-19 13:43:35,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:35,383 INFO L470 AbstractCegarLoop]: Abstraction has 158 states and 193 transitions. [2021-11-19 13:43:35,383 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) [2021-11-19 13:43:35,383 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 193 transitions. [2021-11-19 13:43:35,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-19 13:43:35,384 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:35,384 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] [2021-11-19 13:43:35,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (46)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:35,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:43:35,596 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:43:35,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:35,596 INFO L85 PathProgramCache]: Analyzing trace with hash -1706790695, now seen corresponding path program 1 times [2021-11-19 13:43:35,597 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:43:35,597 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [372046541] [2021-11-19 13:43:35,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:35,597 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:43:35,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:43:35,598 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:43:35,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-19 13:43:35,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:35,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-19 13:43:35,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:35,720 INFO L354 Elim1Store]: treesize reduction 38, result has 35.6 percent of original size [2021-11-19 13:43:35,720 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 14 treesize of output 26 [2021-11-19 13:43:35,869 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:43:35,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:36,455 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:43:36,455 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:43:36,456 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [372046541] [2021-11-19 13:43:36,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [372046541] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:43:36,456 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:43:36,456 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2021-11-19 13:43:36,456 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767827051] [2021-11-19 13:43:36,456 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:43:36,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 13:43:36,457 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:43:36,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 13:43:36,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-19 13:43:36,457 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) [2021-11-19 13:43:37,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:37,062 INFO L93 Difference]: Finished difference Result 300 states and 370 transitions. [2021-11-19 13:43:37,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-19 13:43:37,063 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 [2021-11-19 13:43:37,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:37,065 INFO L225 Difference]: With dead ends: 300 [2021-11-19 13:43:37,065 INFO L226 Difference]: Without dead ends: 300 [2021-11-19 13:43:37,066 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 [2021-11-19 13:43:37,066 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 231 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s 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 [2021-11-19 13:43:37,067 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] [2021-11-19 13:43:37,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2021-11-19 13:43:37,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 184. [2021-11-19 13:43:37,073 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) [2021-11-19 13:43:37,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 231 transitions. [2021-11-19 13:43:37,074 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 231 transitions. Word has length 26 [2021-11-19 13:43:37,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:37,074 INFO L470 AbstractCegarLoop]: Abstraction has 184 states and 231 transitions. [2021-11-19 13:43:37,074 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) [2021-11-19 13:43:37,074 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 231 transitions. [2021-11-19 13:43:37,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-19 13:43:37,075 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:37,075 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] [2021-11-19 13:43:37,098 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (47)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:37,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:43:37,287 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)] === [2021-11-19 13:43:37,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:37,287 INFO L85 PathProgramCache]: Analyzing trace with hash 460228407, now seen corresponding path program 1 times [2021-11-19 13:43:37,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:43:37,287 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1321630111] [2021-11-19 13:43:37,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:37,288 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:43:37,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:43:37,288 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:43:37,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-19 13:43:37,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:37,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-19 13:43:37,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:37,409 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:43:37,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:37,446 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:43:37,447 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:43:37,447 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1321630111] [2021-11-19 13:43:37,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1321630111] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:43:37,447 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:43:37,447 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-19 13:43:37,447 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793792025] [2021-11-19 13:43:37,447 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:43:37,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-19 13:43:37,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:43:37,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-19 13:43:37,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-19 13:43:37,448 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) [2021-11-19 13:43:37,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:37,459 INFO L93 Difference]: Finished difference Result 195 states and 243 transitions. [2021-11-19 13:43:37,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-19 13:43:37,459 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 [2021-11-19 13:43:37,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:37,460 INFO L225 Difference]: With dead ends: 195 [2021-11-19 13:43:37,460 INFO L226 Difference]: Without dead ends: 195 [2021-11-19 13:43:37,460 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 [2021-11-19 13:43:37,461 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 [2021-11-19 13:43:37,461 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] [2021-11-19 13:43:37,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-11-19 13:43:37,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 188. [2021-11-19 13:43:37,483 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) [2021-11-19 13:43:37,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 235 transitions. [2021-11-19 13:43:37,485 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 235 transitions. Word has length 28 [2021-11-19 13:43:37,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:37,486 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 235 transitions. [2021-11-19 13:43:37,487 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) [2021-11-19 13:43:37,487 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 235 transitions. [2021-11-19 13:43:37,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-19 13:43:37,487 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:37,487 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] [2021-11-19 13:43:37,499 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:37,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:43:37,699 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)] === [2021-11-19 13:43:37,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:37,700 INFO L85 PathProgramCache]: Analyzing trace with hash -1314778955, now seen corresponding path program 1 times [2021-11-19 13:43:37,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:43:37,700 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [617142796] [2021-11-19 13:43:37,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:37,700 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:43:37,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:43:37,701 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:43:37,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2021-11-19 13:43:37,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:37,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-19 13:43:37,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:40,188 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:43:40,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:42,441 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:43:42,441 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:43:42,441 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [617142796] [2021-11-19 13:43:42,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [617142796] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-19 13:43:42,441 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-19 13:43:42,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-19 13:43:42,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68038706] [2021-11-19 13:43:42,441 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-19 13:43:42,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-19 13:43:42,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:43:42,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-19 13:43:42,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=25, Unknown=2, NotChecked=0, Total=42 [2021-11-19 13:43:42,442 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) [2021-11-19 13:43:42,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:42,565 INFO L93 Difference]: Finished difference Result 187 states and 234 transitions. [2021-11-19 13:43:42,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 13:43:42,566 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 [2021-11-19 13:43:42,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:42,567 INFO L225 Difference]: With dead ends: 187 [2021-11-19 13:43:42,567 INFO L226 Difference]: Without dead ends: 185 [2021-11-19 13:43:42,567 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=15, Invalid=25, Unknown=2, NotChecked=0, Total=42 [2021-11-19 13:43:42,568 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 [2021-11-19 13:43:42,568 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] [2021-11-19 13:43:42,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-11-19 13:43:42,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2021-11-19 13:43:42,572 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) [2021-11-19 13:43:42,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 229 transitions. [2021-11-19 13:43:42,573 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 229 transitions. Word has length 28 [2021-11-19 13:43:42,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:42,574 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 229 transitions. [2021-11-19 13:43:42,574 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) [2021-11-19 13:43:42,574 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 229 transitions. [2021-11-19 13:43:42,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-19 13:43:42,574 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:42,575 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] [2021-11-19 13:43:42,591 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (49)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:42,787 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:43:42,787 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:43:42,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:42,788 INFO L85 PathProgramCache]: Analyzing trace with hash -1314778088, now seen corresponding path program 1 times [2021-11-19 13:43:42,788 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:43:42,788 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1814017462] [2021-11-19 13:43:42,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:42,788 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:43:42,788 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:43:42,789 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:43:42,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-19 13:43:42,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:42,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-19 13:43:42,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:42,954 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:43:42,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:43,049 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:43:43,050 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:43:43,050 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1814017462] [2021-11-19 13:43:43,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1814017462] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:43,050 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1510113478] [2021-11-19 13:43:43,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:43,050 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:43:43,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:43:43,051 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:43:43,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2021-11-19 13:43:43,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:43,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-19 13:43:43,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:43,231 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:43:43,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:43,294 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:43:43,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1510113478] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:43,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975182283] [2021-11-19 13:43:43,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:43,295 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:43:43,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:43:43,295 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:43:43,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-19 13:43:43,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:43,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-19 13:43:43,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:43,445 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:43:43,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:43,524 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:43:43,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975182283] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:43,524 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:43:43,524 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-19 13:43:43,524 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612195170] [2021-11-19 13:43:43,524 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:43:43,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-19 13:43:43,525 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:43:43,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-19 13:43:43,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-19 13:43:43,526 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) [2021-11-19 13:43:43,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:43,621 INFO L93 Difference]: Finished difference Result 260 states and 314 transitions. [2021-11-19 13:43:43,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 13:43:43,622 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 [2021-11-19 13:43:43,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:43,624 INFO L225 Difference]: With dead ends: 260 [2021-11-19 13:43:43,624 INFO L226 Difference]: Without dead ends: 222 [2021-11-19 13:43:43,624 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 [2021-11-19 13:43:43,625 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 [2021-11-19 13:43:43,625 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] [2021-11-19 13:43:43,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-11-19 13:43:43,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 219. [2021-11-19 13:43:43,630 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) [2021-11-19 13:43:43,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 271 transitions. [2021-11-19 13:43:43,631 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 271 transitions. Word has length 28 [2021-11-19 13:43:43,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:43,631 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 271 transitions. [2021-11-19 13:43:43,632 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) [2021-11-19 13:43:43,632 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 271 transitions. [2021-11-19 13:43:43,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-19 13:43:43,632 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:43,632 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] [2021-11-19 13:43:43,644 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (50)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:43,853 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2021-11-19 13:43:44,035 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (51)] Ended with exit code 0 [2021-11-19 13:43:44,233 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 13:43:44,233 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:43:44,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:44,234 INFO L85 PathProgramCache]: Analyzing trace with hash -1252738474, now seen corresponding path program 1 times [2021-11-19 13:43:44,234 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:43:44,234 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1909740438] [2021-11-19 13:43:44,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:44,234 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:43:44,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:43:44,236 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:43:44,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2021-11-19 13:43:44,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:44,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-19 13:43:44,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:44,505 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:43:44,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:44,664 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:43:44,664 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:43:44,664 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1909740438] [2021-11-19 13:43:44,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1909740438] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:44,664 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1710926103] [2021-11-19 13:43:44,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:44,664 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:43:44,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:43:44,665 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:43:44,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (54)] Waiting until timeout for monitored process [2021-11-19 13:43:44,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:44,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-19 13:43:44,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:44,925 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:43:44,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:45,007 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:43:45,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1710926103] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:45,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [176769681] [2021-11-19 13:43:45,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:43:45,008 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:43:45,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:43:45,008 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:43:45,009 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-19 13:43:45,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:43:45,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-19 13:43:45,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:45,221 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:43:45,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:45,302 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:43:45,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [176769681] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:45,303 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:43:45,303 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 8, 7, 8, 7] total 13 [2021-11-19 13:43:45,303 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367754034] [2021-11-19 13:43:45,303 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:43:45,303 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-19 13:43:45,304 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:43:45,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-19 13:43:45,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-19 13:43:45,305 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) [2021-11-19 13:43:45,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:43:45,598 INFO L93 Difference]: Finished difference Result 294 states and 356 transitions. [2021-11-19 13:43:45,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-19 13:43:45,599 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 [2021-11-19 13:43:45,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:43:45,601 INFO L225 Difference]: With dead ends: 294 [2021-11-19 13:43:45,601 INFO L226 Difference]: Without dead ends: 262 [2021-11-19 13:43:45,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=87, Invalid=219, Unknown=0, NotChecked=0, Total=306 [2021-11-19 13:43:45,602 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 [2021-11-19 13:43:45,602 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] [2021-11-19 13:43:45,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2021-11-19 13:43:45,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 219. [2021-11-19 13:43:45,608 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) [2021-11-19 13:43:45,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 270 transitions. [2021-11-19 13:43:45,609 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 270 transitions. Word has length 28 [2021-11-19 13:43:45,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:43:45,609 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 270 transitions. [2021-11-19 13:43:45,609 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) [2021-11-19 13:43:45,610 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 270 transitions. [2021-11-19 13:43:45,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-19 13:43:45,610 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:43:45,610 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] [2021-11-19 13:43:45,636 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2021-11-19 13:43:45,830 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (53)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:46,025 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (54)] Forceful destruction successful, exit code 0 [2021-11-19 13:43:46,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 13:43:46,223 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:43:46,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:43:46,224 INFO L85 PathProgramCache]: Analyzing trace with hash 1138703979, now seen corresponding path program 2 times [2021-11-19 13:43:46,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:43:46,224 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [951304482] [2021-11-19 13:43:46,224 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:43:46,224 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:43:46,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:43:46,225 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:43:46,226 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-19 13:43:46,299 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:43:46,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:43:46,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-19 13:43:46,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:46,489 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:46,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:46,972 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 [2021-11-19 13:43:47,303 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:47,303 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:43:47,303 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [951304482] [2021-11-19 13:43:47,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [951304482] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:47,304 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [960232908] [2021-11-19 13:43:47,304 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:43:47,304 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:43:47,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:43:47,305 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:43:47,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (57)] Waiting until timeout for monitored process [2021-11-19 13:43:47,484 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:43:47,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:43:47,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-19 13:43:47,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:47,593 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:43:47,593 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 [2021-11-19 13:43:47,597 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 [2021-11-19 13:43:57,136 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:57,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:58,342 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 [2021-11-19 13:43:58,350 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:58,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [960232908] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:58,351 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1138719721] [2021-11-19 13:43:58,351 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:43:58,352 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:43:58,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:43:58,352 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:43:58,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-19 13:43:58,416 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:43:58,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:43:58,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-19 13:43:58,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:43:58,557 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:58,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:43:58,766 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 [2021-11-19 13:43:58,877 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:43:58,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1138719721] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:43:58,877 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:43:58,878 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11, 10, 8, 8] total 30 [2021-11-19 13:43:58,878 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186742216] [2021-11-19 13:43:58,878 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:43:58,878 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-19 13:43:58,879 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:43:58,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-19 13:43:58,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=766, Unknown=0, NotChecked=0, Total=930 [2021-11-19 13:43:58,880 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) [2021-11-19 13:44:00,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:44:00,998 INFO L93 Difference]: Finished difference Result 260 states and 319 transitions. [2021-11-19 13:44:00,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-19 13:44:01,000 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 [2021-11-19 13:44:01,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:44:01,001 INFO L225 Difference]: With dead ends: 260 [2021-11-19 13:44:01,001 INFO L226 Difference]: Without dead ends: 260 [2021-11-19 13:44:01,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 483 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=252, Invalid=1230, Unknown=0, NotChecked=0, Total=1482 [2021-11-19 13:44:01,003 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 37 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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, 0.3s IncrementalHoareTripleChecker+Time [2021-11-19 13:44:01,003 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 288 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 79 Invalid, 0 Unknown, 54 Unchecked, 0.3s Time] [2021-11-19 13:44:01,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-11-19 13:44:01,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 233. [2021-11-19 13:44:01,009 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) [2021-11-19 13:44:01,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 288 transitions. [2021-11-19 13:44:01,010 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 288 transitions. Word has length 29 [2021-11-19 13:44:01,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:44:01,010 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 288 transitions. [2021-11-19 13:44:01,010 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) [2021-11-19 13:44:01,010 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 288 transitions. [2021-11-19 13:44:01,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-19 13:44:01,011 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:44:01,012 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] [2021-11-19 13:44:01,046 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-19 13:44:01,237 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (56)] Forceful destruction successful, exit code 0 [2021-11-19 13:44:01,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (57)] Forceful destruction successful, exit code 0 [2021-11-19 13:44:01,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 13:44:01,627 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:44:01,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:44:01,628 INFO L85 PathProgramCache]: Analyzing trace with hash -112944909, now seen corresponding path program 2 times [2021-11-19 13:44:01,628 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:44:01,628 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [771034414] [2021-11-19 13:44:01,628 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:44:01,628 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:44:01,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:44:01,630 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:44:01,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (59)] Waiting until timeout for monitored process [2021-11-19 13:44:01,730 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:44:01,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:44:01,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-19 13:44:01,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:44:02,034 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:44:02,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:44:02,653 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 [2021-11-19 13:44:02,889 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:44:02,889 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:44:02,889 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [771034414] [2021-11-19 13:44:02,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [771034414] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:44:02,889 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1019757885] [2021-11-19 13:44:02,889 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:44:02,890 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:44:02,890 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:44:02,891 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:44:02,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (60)] Waiting until timeout for monitored process [2021-11-19 13:44:03,017 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:44:03,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:44:03,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-19 13:44:03,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:44:03,128 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-19 13:44:03,128 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 40 treesize of output 43 [2021-11-19 13:44:03,134 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:44:03,134 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 [2021-11-19 13:44:06,184 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:44:06,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:44:07,222 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:44:07,222 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 [2021-11-19 13:44:07,229 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:44:07,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1019757885] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:44:07,230 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1669872383] [2021-11-19 13:44:07,230 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:44:07,230 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:44:07,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:44:07,231 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:44:07,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-19 13:44:07,289 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:44:07,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:44:07,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-19 13:44:07,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:44:07,472 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:44:07,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:44:07,786 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 [2021-11-19 13:44:07,875 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:44:07,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1669872383] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:44:07,875 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:44:07,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 9, 8, 6, 6] total 23 [2021-11-19 13:44:07,875 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163573632] [2021-11-19 13:44:07,876 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:44:07,876 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-19 13:44:07,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:44:07,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-19 13:44:07,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2021-11-19 13:44:07,877 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) [2021-11-19 13:44:10,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:44:10,703 INFO L93 Difference]: Finished difference Result 424 states and 520 transitions. [2021-11-19 13:44:10,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-19 13:44:10,705 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 [2021-11-19 13:44:10,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:44:10,707 INFO L225 Difference]: With dead ends: 424 [2021-11-19 13:44:10,707 INFO L226 Difference]: Without dead ends: 424 [2021-11-19 13:44:10,707 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=209, Invalid=847, Unknown=0, NotChecked=0, Total=1056 [2021-11-19 13:44:10,708 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 [2021-11-19 13:44:10,709 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] [2021-11-19 13:44:10,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2021-11-19 13:44:10,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 299. [2021-11-19 13:44:10,717 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) [2021-11-19 13:44:10,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 373 transitions. [2021-11-19 13:44:10,718 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 373 transitions. Word has length 32 [2021-11-19 13:44:10,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:44:10,719 INFO L470 AbstractCegarLoop]: Abstraction has 299 states and 373 transitions. [2021-11-19 13:44:10,719 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) [2021-11-19 13:44:10,719 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 373 transitions. [2021-11-19 13:44:10,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-19 13:44:10,720 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:44:10,720 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] [2021-11-19 13:44:10,735 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (60)] Ended with exit code 0 [2021-11-19 13:44:10,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (59)] Forceful destruction successful, exit code 0 [2021-11-19 13:44:11,155 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-11-19 13:44:11,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:44:11,334 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:44:11,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:44:11,334 INFO L85 PathProgramCache]: Analyzing trace with hash -1409463453, now seen corresponding path program 3 times [2021-11-19 13:44:11,335 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:44:11,335 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [655361764] [2021-11-19 13:44:11,335 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:44:11,335 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:44:11,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:44:11,336 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:44:11,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (62)] Waiting until timeout for monitored process [2021-11-19 13:44:11,438 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-19 13:44:11,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:44:11,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-19 13:44:11,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:44:11,518 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:44:11,519 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 [2021-11-19 13:44:11,522 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 [2021-11-19 13:44:18,683 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-19 13:44:18,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:44:20,342 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 [2021-11-19 13:44:20,424 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-19 13:44:20,424 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:44:20,424 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [655361764] [2021-11-19 13:44:20,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [655361764] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:44:20,424 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [578280700] [2021-11-19 13:44:20,424 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:44:20,425 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:44:20,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:44:20,426 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:44:20,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (63)] Waiting until timeout for monitored process [2021-11-19 13:44:20,615 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-19 13:44:20,615 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:44:20,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-19 13:44:20,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:44:20,668 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:44:20,669 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 [2021-11-19 13:44:20,672 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 [2021-11-19 13:44:21,383 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-19 13:44:21,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:44:23,432 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 [2021-11-19 13:44:23,455 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-19 13:44:23,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [578280700] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:44:23,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2132136450] [2021-11-19 13:44:23,455 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:44:23,455 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:44:23,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:44:23,456 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:44:23,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-19 13:44:23,564 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-19 13:44:23,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:44:23,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-19 13:44:23,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:44:23,625 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:44:23,626 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 [2021-11-19 13:44:23,634 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 [2021-11-19 13:44:34,153 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:44:34,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:44:36,671 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:44:36,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2132136450] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:44:36,671 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:44:36,672 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 12, 11] total 37 [2021-11-19 13:44:36,672 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921447945] [2021-11-19 13:44:36,672 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:44:36,672 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-19 13:44:36,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:44:36,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-19 13:44:36,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=1097, Unknown=0, NotChecked=0, Total=1332 [2021-11-19 13:44:36,673 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) [2021-11-19 13:44:46,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:44:46,640 INFO L93 Difference]: Finished difference Result 575 states and 725 transitions. [2021-11-19 13:44:46,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-19 13:44:46,642 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 [2021-11-19 13:44:46,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:44:46,645 INFO L225 Difference]: With dead ends: 575 [2021-11-19 13:44:46,645 INFO L226 Difference]: Without dead ends: 563 [2021-11-19 13:44:46,646 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 161 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 851 ImplicationChecksByTransitivity, 28.5s TimeCoverageRelationStatistics Valid=444, Invalid=2106, Unknown=0, NotChecked=0, Total=2550 [2021-11-19 13:44:46,646 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 111 mSDsluCounter, 476 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s 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, 1.2s IncrementalHoareTripleChecker+Time [2021-11-19 13:44:46,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 509 Invalid, 326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 143 Invalid, 0 Unknown, 174 Unchecked, 1.2s Time] [2021-11-19 13:44:46,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 563 states. [2021-11-19 13:44:46,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 563 to 397. [2021-11-19 13:44:46,656 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) [2021-11-19 13:44:46,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 519 transitions. [2021-11-19 13:44:46,658 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 519 transitions. Word has length 33 [2021-11-19 13:44:46,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:44:46,658 INFO L470 AbstractCegarLoop]: Abstraction has 397 states and 519 transitions. [2021-11-19 13:44:46,658 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) [2021-11-19 13:44:46,658 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 519 transitions. [2021-11-19 13:44:46,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-19 13:44:46,659 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:44:46,659 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] [2021-11-19 13:44:46,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (63)] Forceful destruction successful, exit code 0 [2021-11-19 13:44:46,884 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2021-11-19 13:44:47,071 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (62)] Ended with exit code 0 [2021-11-19 13:44:47,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:44:47,267 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:44:47,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:44:47,268 INFO L85 PathProgramCache]: Analyzing trace with hash -54518167, now seen corresponding path program 1 times [2021-11-19 13:44:47,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:44:47,268 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [811208908] [2021-11-19 13:44:47,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:44:47,269 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:44:47,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:44:47,270 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:44:47,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (65)] Waiting until timeout for monitored process [2021-11-19 13:44:47,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:44:47,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-19 13:44:47,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:44:47,664 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:44:47,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:44:48,346 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 [2021-11-19 13:44:48,671 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:44:48,672 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:44:48,672 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [811208908] [2021-11-19 13:44:48,672 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [811208908] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:44:48,672 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [215437917] [2021-11-19 13:44:48,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:44:48,673 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:44:48,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:44:48,673 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:44:48,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (66)] Waiting until timeout for monitored process [2021-11-19 13:44:48,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:44:48,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-19 13:44:48,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:44:49,038 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:44:49,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:44:49,473 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 [2021-11-19 13:44:49,574 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:44:49,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [215437917] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:44:49,574 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [181137043] [2021-11-19 13:44:49,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:44:49,575 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:44:49,575 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:44:49,575 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:44:49,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-19 13:44:49,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:44:49,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-19 13:44:49,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:44:49,855 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:44:49,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:44:50,270 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 [2021-11-19 13:44:50,376 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:44:50,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [181137043] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:44:50,377 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:44:50,377 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 11 [2021-11-19 13:44:50,377 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49707701] [2021-11-19 13:44:50,377 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:44:50,378 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-19 13:44:50,378 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:44:50,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-19 13:44:50,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-11-19 13:44:50,379 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) [2021-11-19 13:44:52,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:44:52,718 INFO L93 Difference]: Finished difference Result 1249 states and 1678 transitions. [2021-11-19 13:44:52,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-19 13:44:52,719 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 [2021-11-19 13:44:52,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:44:52,725 INFO L225 Difference]: With dead ends: 1249 [2021-11-19 13:44:52,725 INFO L226 Difference]: Without dead ends: 1249 [2021-11-19 13:44:52,726 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=148, Invalid=452, Unknown=0, NotChecked=0, Total=600 [2021-11-19 13:44:52,726 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 499 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s 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, 1.1s IncrementalHoareTripleChecker+Time [2021-11-19 13:44:52,727 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [499 Valid, 236 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-19 13:44:52,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1249 states. [2021-11-19 13:44:52,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1249 to 367. [2021-11-19 13:44:52,741 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) [2021-11-19 13:44:52,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 476 transitions. [2021-11-19 13:44:52,742 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 476 transitions. Word has length 35 [2021-11-19 13:44:52,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:44:52,743 INFO L470 AbstractCegarLoop]: Abstraction has 367 states and 476 transitions. [2021-11-19 13:44:52,743 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) [2021-11-19 13:44:52,743 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 476 transitions. [2021-11-19 13:44:52,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-19 13:44:52,744 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:44:52,744 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1] [2021-11-19 13:44:52,780 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2021-11-19 13:44:52,972 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (65)] Ended with exit code 0 [2021-11-19 13:44:53,168 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (66)] Ended with exit code 0 [2021-11-19 13:44:53,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 13:44:53,365 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:44:53,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:44:53,365 INFO L85 PathProgramCache]: Analyzing trace with hash 1249695552, now seen corresponding path program 3 times [2021-11-19 13:44:53,365 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:44:53,365 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1212701071] [2021-11-19 13:44:53,366 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:44:53,366 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:44:53,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:44:53,366 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:44:53,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (68)] Waiting until timeout for monitored process [2021-11-19 13:44:53,490 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-19 13:44:53,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:44:53,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-19 13:44:53,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:44:53,565 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-19 13:44:53,565 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 [2021-11-19 13:44:53,572 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:44:53,572 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 [2021-11-19 13:44:56,775 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:44:56,775 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:44:59,257 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:44:59,258 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 [2021-11-19 13:44:59,390 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:44:59,391 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:44:59,391 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1212701071] [2021-11-19 13:44:59,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1212701071] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:44:59,391 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2062094233] [2021-11-19 13:44:59,391 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:44:59,391 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:44:59,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:44:59,392 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:44:59,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (69)] Waiting until timeout for monitored process [2021-11-19 13:44:59,753 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-19 13:44:59,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:44:59,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-19 13:44:59,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:44:59,920 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-19 13:44:59,920 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 [2021-11-19 13:44:59,926 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:44:59,926 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 [2021-11-19 13:45:03,616 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:45:03,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:45:11,800 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:45:11,801 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 [2021-11-19 13:45:12,050 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:45:12,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2062094233] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:45:12,051 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1330208544] [2021-11-19 13:45:12,051 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:45:12,051 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:45:12,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:45:12,052 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:45:12,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-19 13:45:13,793 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-19 13:45:13,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:45:13,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-19 13:45:13,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:45:13,853 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-19 13:45:13,854 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 [2021-11-19 13:45:13,859 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:45:13,860 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 [2021-11-19 13:45:16,946 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:45:16,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:45:22,781 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:45:22,781 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 [2021-11-19 13:45:22,841 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-19 13:45:22,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1330208544] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:45:22,841 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:45:22,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 15, 15, 14, 14] total 54 [2021-11-19 13:45:22,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416781919] [2021-11-19 13:45:22,842 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:45:22,843 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-19 13:45:22,843 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:45:22,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-19 13:45:22,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=819, Invalid=2151, Unknown=0, NotChecked=0, Total=2970 [2021-11-19 13:45:22,845 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) [2021-11-19 13:45:37,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:45:37,267 INFO L93 Difference]: Finished difference Result 431 states and 556 transitions. [2021-11-19 13:45:37,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-19 13:45:37,268 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 [2021-11-19 13:45:37,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:45:37,269 INFO L225 Difference]: With dead ends: 431 [2021-11-19 13:45:37,269 INFO L226 Difference]: Without dead ends: 431 [2021-11-19 13:45:37,271 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 153 SyntacticMatches, 9 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2575 ImplicationChecksByTransitivity, 26.5s TimeCoverageRelationStatistics Valid=1629, Invalid=3921, Unknown=0, NotChecked=0, Total=5550 [2021-11-19 13:45:37,271 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 [2021-11-19 13:45:37,271 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] [2021-11-19 13:45:37,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 431 states. [2021-11-19 13:45:37,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 431 to 431. [2021-11-19 13:45:37,279 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) [2021-11-19 13:45:37,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 556 transitions. [2021-11-19 13:45:37,280 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 556 transitions. Word has length 35 [2021-11-19 13:45:37,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:45:37,281 INFO L470 AbstractCegarLoop]: Abstraction has 431 states and 556 transitions. [2021-11-19 13:45:37,281 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) [2021-11-19 13:45:37,281 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 556 transitions. [2021-11-19 13:45:37,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-19 13:45:37,287 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:45:37,287 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] [2021-11-19 13:45:37,299 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (68)] Forceful destruction successful, exit code 0 [2021-11-19 13:45:37,500 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (69)] Ended with exit code 0 [2021-11-19 13:45:37,721 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Ended with exit code 0 [2021-11-19 13:45:37,899 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:45:37,899 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:45:37,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:45:37,900 INFO L85 PathProgramCache]: Analyzing trace with hash -524293744, now seen corresponding path program 3 times [2021-11-19 13:45:37,900 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:45:37,900 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1364285475] [2021-11-19 13:45:37,900 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:45:37,900 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:45:37,900 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:45:37,901 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:45:37,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (71)] Waiting until timeout for monitored process [2021-11-19 13:45:38,107 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-19 13:45:38,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:45:38,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-19 13:45:38,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:45:38,184 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-19 13:45:38,184 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 [2021-11-19 13:45:38,191 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:45:38,191 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 [2021-11-19 13:45:41,398 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:45:41,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:45:45,163 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 24 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:45:45,164 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:45:45,164 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1364285475] [2021-11-19 13:45:45,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1364285475] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:45:45,164 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [950833403] [2021-11-19 13:45:45,164 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:45:45,164 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:45:45,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:45:45,165 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:45:45,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (72)] Waiting until timeout for monitored process [2021-11-19 13:45:45,543 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-19 13:45:45,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:45:45,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-19 13:45:45,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:45:45,625 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-19 13:45:45,625 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 [2021-11-19 13:45:45,633 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:45:45,633 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 [2021-11-19 13:45:48,041 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-19 13:45:48,041 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 [2021-11-19 13:45:48,227 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:45:48,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:45:50,941 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 7 proven. 18 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:45:50,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [950833403] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:45:50,941 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [469378871] [2021-11-19 13:45:50,941 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:45:50,941 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:45:50,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:45:50,942 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:45:50,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-19 13:45:51,086 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-19 13:45:51,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:45:51,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-19 13:45:51,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:45:51,944 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:45:51,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:45:52,799 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:45:52,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [469378871] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:45:52,799 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:45:52,799 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 12, 11, 11, 10] total 44 [2021-11-19 13:45:52,799 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763480908] [2021-11-19 13:45:52,799 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:45:52,800 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-19 13:45:52,800 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:45:52,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-19 13:45:52,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=1588, Unknown=0, NotChecked=0, Total=1892 [2021-11-19 13:45:52,801 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) [2021-11-19 13:45:54,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:45:54,651 INFO L93 Difference]: Finished difference Result 745 states and 974 transitions. [2021-11-19 13:45:54,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-19 13:45:54,652 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 [2021-11-19 13:45:54,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:45:54,655 INFO L225 Difference]: With dead ends: 745 [2021-11-19 13:45:54,655 INFO L226 Difference]: Without dead ends: 739 [2021-11-19 13:45:54,656 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 192 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1031 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=397, Invalid=1955, Unknown=0, NotChecked=0, Total=2352 [2021-11-19 13:45:54,656 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 163 mSDsluCounter, 571 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s 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 [2021-11-19 13:45:54,657 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] [2021-11-19 13:45:54,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 739 states. [2021-11-19 13:45:54,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 739 to 689. [2021-11-19 13:45:54,668 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) [2021-11-19 13:45:54,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 689 states to 689 states and 917 transitions. [2021-11-19 13:45:54,671 INFO L78 Accepts]: Start accepts. Automaton has 689 states and 917 transitions. Word has length 40 [2021-11-19 13:45:54,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:45:54,671 INFO L470 AbstractCegarLoop]: Abstraction has 689 states and 917 transitions. [2021-11-19 13:45:54,671 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) [2021-11-19 13:45:54,671 INFO L276 IsEmpty]: Start isEmpty. Operand 689 states and 917 transitions. [2021-11-19 13:45:54,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-19 13:45:54,673 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:45:54,673 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 13:45:54,701 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Ended with exit code 0 [2021-11-19 13:45:54,899 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (71)] Ended with exit code 0 [2021-11-19 13:45:55,093 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (72)] Ended with exit code 0 [2021-11-19 13:45:55,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 13:45:55,291 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:45:55,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:45:55,292 INFO L85 PathProgramCache]: Analyzing trace with hash -1396579989, now seen corresponding path program 3 times [2021-11-19 13:45:55,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:45:55,292 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [195196504] [2021-11-19 13:45:55,292 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:45:55,292 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:45:55,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:45:55,293 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:45:55,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (74)] Waiting until timeout for monitored process [2021-11-19 13:45:55,434 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-19 13:45:55,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:45:55,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-19 13:45:55,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:45:55,495 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:45:55,496 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 [2021-11-19 13:45:55,500 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 [2021-11-19 13:46:05,158 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:46:05,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:46:09,811 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 [2021-11-19 13:46:10,056 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:46:10,057 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:46:10,057 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [195196504] [2021-11-19 13:46:10,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [195196504] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:46:10,057 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [676159391] [2021-11-19 13:46:10,058 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:46:10,058 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:46:10,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:46:10,063 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:46:10,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (75)] Waiting until timeout for monitored process [2021-11-19 13:46:10,487 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-19 13:46:10,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:46:10,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-19 13:46:10,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:46:10,583 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:46:10,583 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 [2021-11-19 13:46:10,587 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 [2021-11-19 13:46:17,987 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:46:17,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:46:27,359 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 [2021-11-19 13:46:27,399 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:46:27,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [676159391] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:46:27,400 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1125409051] [2021-11-19 13:46:27,400 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:46:27,400 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:46:27,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:46:27,403 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:46:27,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-19 13:46:29,810 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-19 13:46:29,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:46:29,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-19 13:46:29,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:46:29,870 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:46:29,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 32 treesize of output 39 [2021-11-19 13:46:29,873 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 [2021-11-19 13:46:32,921 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:46:32,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:46:37,130 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 [2021-11-19 13:46:37,152 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:46:37,153 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1125409051] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:46:37,153 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:46:37,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 16, 16, 13, 13] total 48 [2021-11-19 13:46:37,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859879230] [2021-11-19 13:46:37,153 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:46:37,153 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-19 13:46:37,153 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:46:37,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-19 13:46:37,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=1751, Unknown=0, NotChecked=0, Total=2352 [2021-11-19 13:46:37,159 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) [2021-11-19 13:47:06,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:47:06,001 INFO L93 Difference]: Finished difference Result 817 states and 1077 transitions. [2021-11-19 13:47:06,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-19 13:47:06,001 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 [2021-11-19 13:47:06,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:47:06,004 INFO L225 Difference]: With dead ends: 817 [2021-11-19 13:47:06,004 INFO L226 Difference]: Without dead ends: 817 [2021-11-19 13:47:06,006 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 197 SyntacticMatches, 6 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1932 ImplicationChecksByTransitivity, 54.8s TimeCoverageRelationStatistics Valid=1430, Invalid=3826, Unknown=0, NotChecked=0, Total=5256 [2021-11-19 13:47:06,006 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 102 mSDsluCounter, 370 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s 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, 2.5s IncrementalHoareTripleChecker+Time [2021-11-19 13:47:06,006 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 406 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 209 Invalid, 0 Unknown, 45 Unchecked, 2.5s Time] [2021-11-19 13:47:06,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 817 states. [2021-11-19 13:47:06,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 817 to 817. [2021-11-19 13:47:06,021 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) [2021-11-19 13:47:06,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 817 states to 817 states and 1077 transitions. [2021-11-19 13:47:06,024 INFO L78 Accepts]: Start accepts. Automaton has 817 states and 1077 transitions. Word has length 41 [2021-11-19 13:47:06,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:47:06,024 INFO L470 AbstractCegarLoop]: Abstraction has 817 states and 1077 transitions. [2021-11-19 13:47:06,025 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) [2021-11-19 13:47:06,025 INFO L276 IsEmpty]: Start isEmpty. Operand 817 states and 1077 transitions. [2021-11-19 13:47:06,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-19 13:47:06,026 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:47:06,026 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] [2021-11-19 13:47:06,047 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (74)] Ended with exit code 0 [2021-11-19 13:47:06,261 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Forceful destruction successful, exit code 0 [2021-11-19 13:47:06,440 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (75)] Ended with exit code 0 [2021-11-19 13:47:06,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 13:47:06,638 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:47:06,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:47:06,639 INFO L85 PathProgramCache]: Analyzing trace with hash 829184327, now seen corresponding path program 1 times [2021-11-19 13:47:06,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:47:06,639 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1056857099] [2021-11-19 13:47:06,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:47:06,639 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:47:06,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:47:06,640 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:47:06,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (77)] Waiting until timeout for monitored process [2021-11-19 13:47:06,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:47:06,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-19 13:47:06,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:47:06,884 INFO L354 Elim1Store]: treesize reduction 42, result has 35.4 percent of original size [2021-11-19 13:47:06,884 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 [2021-11-19 13:47:07,526 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:47:07,527 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:47:08,680 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:47:08,680 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:47:08,680 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1056857099] [2021-11-19 13:47:08,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1056857099] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:47:08,680 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1477729694] [2021-11-19 13:47:08,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:47:08,680 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:47:08,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:47:08,681 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:47:08,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (78)] Waiting until timeout for monitored process [2021-11-19 13:47:08,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:47:08,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-19 13:47:08,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:47:08,916 INFO L354 Elim1Store]: treesize reduction 42, result has 35.4 percent of original size [2021-11-19 13:47:08,916 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 [2021-11-19 13:47:09,690 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:47:09,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:47:11,029 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:47:11,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1477729694] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:47:11,029 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [862413738] [2021-11-19 13:47:11,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:47:11,030 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:47:11,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:47:11,030 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:47:11,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2021-11-19 13:47:11,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:47:11,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-19 13:47:11,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:47:11,251 INFO L354 Elim1Store]: treesize reduction 42, result has 35.4 percent of original size [2021-11-19 13:47:11,252 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 [2021-11-19 13:47:11,892 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:47:11,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:47:12,540 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:47:12,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [862413738] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:47:12,540 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:47:12,540 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9, 8, 7, 7] total 25 [2021-11-19 13:47:12,541 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465011397] [2021-11-19 13:47:12,541 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:47:12,541 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-19 13:47:12,541 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:47:12,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-19 13:47:12,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=517, Unknown=0, NotChecked=0, Total=650 [2021-11-19 13:47:12,542 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) [2021-11-19 13:47:13,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:47:13,712 INFO L93 Difference]: Finished difference Result 1275 states and 1691 transitions. [2021-11-19 13:47:13,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-19 13:47:13,713 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 [2021-11-19 13:47:13,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:47:13,718 INFO L225 Difference]: With dead ends: 1275 [2021-11-19 13:47:13,718 INFO L226 Difference]: Without dead ends: 1275 [2021-11-19 13:47:13,718 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 [2021-11-19 13:47:13,719 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 315 mSDsluCounter, 357 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s 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 [2021-11-19 13:47:13,719 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] [2021-11-19 13:47:13,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1275 states. [2021-11-19 13:47:13,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1275 to 875. [2021-11-19 13:47:13,737 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) [2021-11-19 13:47:13,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 875 states to 875 states and 1159 transitions. [2021-11-19 13:47:13,739 INFO L78 Accepts]: Start accepts. Automaton has 875 states and 1159 transitions. Word has length 41 [2021-11-19 13:47:13,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:47:13,740 INFO L470 AbstractCegarLoop]: Abstraction has 875 states and 1159 transitions. [2021-11-19 13:47:13,740 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) [2021-11-19 13:47:13,740 INFO L276 IsEmpty]: Start isEmpty. Operand 875 states and 1159 transitions. [2021-11-19 13:47:13,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-19 13:47:13,742 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:47:13,742 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] [2021-11-19 13:47:13,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Forceful destruction successful, exit code 0 [2021-11-19 13:47:13,975 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (77)] Ended with exit code 0 [2021-11-19 13:47:14,169 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (78)] Ended with exit code 0 [2021-11-19 13:47:14,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 13:47:14,367 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:47:14,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:47:14,368 INFO L85 PathProgramCache]: Analyzing trace with hash 510761222, now seen corresponding path program 1 times [2021-11-19 13:47:14,368 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:47:14,368 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1864298486] [2021-11-19 13:47:14,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:47:14,368 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:47:14,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:47:14,369 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:47:14,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (80)] Waiting until timeout for monitored process [2021-11-19 13:47:14,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:47:14,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-19 13:47:14,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:47:14,869 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:47:14,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:47:15,293 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:47:15,293 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:47:15,294 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1864298486] [2021-11-19 13:47:15,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1864298486] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:47:15,294 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [707702241] [2021-11-19 13:47:15,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:47:15,294 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:47:15,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:47:15,295 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:47:15,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (81)] Waiting until timeout for monitored process [2021-11-19 13:47:15,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:47:15,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-19 13:47:15,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:47:15,712 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:47:15,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:47:15,907 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:47:15,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [707702241] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:47:15,907 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1671016806] [2021-11-19 13:47:15,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:47:15,908 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:47:15,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:47:15,909 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:47:15,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-19 13:47:15,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:47:15,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-19 13:47:15,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:47:16,303 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:47:16,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:47:16,505 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:47:16,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1671016806] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:47:16,506 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:47:16,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 11, 10, 11, 10] total 19 [2021-11-19 13:47:16,506 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675687310] [2021-11-19 13:47:16,506 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:47:16,506 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-19 13:47:16,506 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:47:16,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-19 13:47:16,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2021-11-19 13:47:16,507 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) [2021-11-19 13:47:17,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:47:17,174 INFO L93 Difference]: Finished difference Result 972 states and 1266 transitions. [2021-11-19 13:47:17,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-19 13:47:17,175 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 [2021-11-19 13:47:17,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:47:17,178 INFO L225 Difference]: With dead ends: 972 [2021-11-19 13:47:17,178 INFO L226 Difference]: Without dead ends: 899 [2021-11-19 13:47:17,179 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 [2021-11-19 13:47:17,179 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 [2021-11-19 13:47:17,179 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] [2021-11-19 13:47:17,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 899 states. [2021-11-19 13:47:17,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 899 to 835. [2021-11-19 13:47:17,193 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) [2021-11-19 13:47:17,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 835 states to 835 states and 1100 transitions. [2021-11-19 13:47:17,196 INFO L78 Accepts]: Start accepts. Automaton has 835 states and 1100 transitions. Word has length 43 [2021-11-19 13:47:17,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:47:17,196 INFO L470 AbstractCegarLoop]: Abstraction has 835 states and 1100 transitions. [2021-11-19 13:47:17,196 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) [2021-11-19 13:47:17,197 INFO L276 IsEmpty]: Start isEmpty. Operand 835 states and 1100 transitions. [2021-11-19 13:47:17,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-19 13:47:17,206 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:47:17,206 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] [2021-11-19 13:47:17,208 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (81)] Forceful destruction successful, exit code 0 [2021-11-19 13:47:17,431 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Ended with exit code 0 [2021-11-19 13:47:17,617 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (80)] Forceful destruction successful, exit code 0 [2021-11-19 13:47:17,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:47:17,809 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:47:17,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:47:17,809 INFO L85 PathProgramCache]: Analyzing trace with hash -2013885157, now seen corresponding path program 1 times [2021-11-19 13:47:17,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:47:17,810 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [635471141] [2021-11-19 13:47:17,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:47:17,810 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:47:17,810 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:47:17,811 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:47:17,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (83)] Waiting until timeout for monitored process [2021-11-19 13:47:17,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:47:17,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-19 13:47:17,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:47:18,193 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 9 proven. 9 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-19 13:47:18,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:47:18,804 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 27 treesize of output 23 [2021-11-19 13:47:19,207 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-19 13:47:19,208 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:47:19,208 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [635471141] [2021-11-19 13:47:19,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [635471141] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:47:19,208 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [12904014] [2021-11-19 13:47:19,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:47:19,208 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:47:19,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:47:19,209 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:47:19,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (84)] Waiting until timeout for monitored process [2021-11-19 13:47:19,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:47:19,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-19 13:47:19,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:47:19,919 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 10 proven. 7 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-19 13:47:19,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:47:20,687 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 10 proven. 7 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-19 13:47:20,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [12904014] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:47:20,687 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332129296] [2021-11-19 13:47:20,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:47:20,687 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:47:20,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:47:20,688 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:47:20,689 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-19 13:47:20,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:47:20,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-19 13:47:20,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:47:21,312 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-19 13:47:21,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:47:21,848 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-19 13:47:21,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [332129296] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:47:21,849 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:47:21,849 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 12, 11, 9, 7] total 45 [2021-11-19 13:47:21,849 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345323901] [2021-11-19 13:47:21,849 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:47:21,849 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-19 13:47:21,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:47:21,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-19 13:47:21,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=1803, Unknown=0, NotChecked=0, Total=1980 [2021-11-19 13:47:21,851 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) [2021-11-19 13:47:30,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:47:30,590 INFO L93 Difference]: Finished difference Result 1702 states and 2021 transitions. [2021-11-19 13:47:30,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-19 13:47:30,591 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 [2021-11-19 13:47:30,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:47:30,609 INFO L225 Difference]: With dead ends: 1702 [2021-11-19 13:47:30,609 INFO L226 Difference]: Without dead ends: 1634 [2021-11-19 13:47:30,612 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2236 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=1504, Invalid=7808, Unknown=0, NotChecked=0, Total=9312 [2021-11-19 13:47:30,616 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 1388 mSDsluCounter, 745 mSDsCounter, 0 mSdLazyCounter, 1256 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s 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, 2.4s IncrementalHoareTripleChecker+Time [2021-11-19 13:47:30,617 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1388 Valid, 790 Invalid, 1413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 1256 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2021-11-19 13:47:30,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1634 states. [2021-11-19 13:47:30,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1634 to 820. [2021-11-19 13:47:30,634 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) [2021-11-19 13:47:30,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 820 states to 820 states and 999 transitions. [2021-11-19 13:47:30,636 INFO L78 Accepts]: Start accepts. Automaton has 820 states and 999 transitions. Word has length 44 [2021-11-19 13:47:30,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:47:30,637 INFO L470 AbstractCegarLoop]: Abstraction has 820 states and 999 transitions. [2021-11-19 13:47:30,637 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) [2021-11-19 13:47:30,637 INFO L276 IsEmpty]: Start isEmpty. Operand 820 states and 999 transitions. [2021-11-19 13:47:30,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-19 13:47:30,638 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:47:30,639 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] [2021-11-19 13:47:30,651 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (83)] Forceful destruction successful, exit code 0 [2021-11-19 13:47:30,853 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (84)] Ended with exit code 0 [2021-11-19 13:47:31,073 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Ended with exit code 0 [2021-11-19 13:47:31,252 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:47:31,252 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:47:31,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:47:31,252 INFO L85 PathProgramCache]: Analyzing trace with hash 1937706185, now seen corresponding path program 2 times [2021-11-19 13:47:31,252 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:47:31,252 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [318012871] [2021-11-19 13:47:31,252 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:47:31,253 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:47:31,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:47:31,254 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:47:31,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (86)] Waiting until timeout for monitored process [2021-11-19 13:47:31,360 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:47:31,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:47:31,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-19 13:47:31,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:47:31,756 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:47:31,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:47:33,218 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 [2021-11-19 13:47:33,832 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:47:33,833 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:47:33,833 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [318012871] [2021-11-19 13:47:33,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [318012871] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:47:33,833 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [653734984] [2021-11-19 13:47:33,833 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:47:33,833 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:47:33,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:47:33,834 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:47:33,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (87)] Waiting until timeout for monitored process [2021-11-19 13:47:33,998 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:47:33,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:47:34,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-19 13:47:34,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:47:34,123 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-19 13:47:34,127 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 [2021-11-19 13:47:34,135 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:47:34,136 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 [2021-11-19 13:47:39,254 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:47:39,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:47:42,033 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:47:42,034 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 [2021-11-19 13:47:42,042 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:47:42,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [653734984] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:47:42,042 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1545442087] [2021-11-19 13:47:42,042 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:47:42,042 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:47:42,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:47:42,043 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:47:42,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-19 13:47:42,117 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:47:42,117 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:47:42,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-19 13:47:42,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:47:42,540 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:47:42,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:47:43,409 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 [2021-11-19 13:47:43,552 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:47:43,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1545442087] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:47:43,552 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:47:43,552 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 12, 11, 8, 9] total 35 [2021-11-19 13:47:43,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799736665] [2021-11-19 13:47:43,552 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:47:43,553 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-19 13:47:43,553 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:47:43,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-19 13:47:43,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1077, Unknown=0, NotChecked=0, Total=1260 [2021-11-19 13:47:43,554 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) [2021-11-19 13:47:53,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:47:53,724 INFO L93 Difference]: Finished difference Result 1663 states and 1988 transitions. [2021-11-19 13:47:53,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-19 13:47:53,726 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 [2021-11-19 13:47:53,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:47:53,732 INFO L225 Difference]: With dead ends: 1663 [2021-11-19 13:47:53,732 INFO L226 Difference]: Without dead ends: 1663 [2021-11-19 13:47:53,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 245 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 691 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=355, Invalid=2297, Unknown=0, NotChecked=0, Total=2652 [2021-11-19 13:47:53,733 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, 2.1s IncrementalHoareTripleChecker+Time [2021-11-19 13:47:53,733 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [195 Valid, 1007 Invalid, 607 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 345 Invalid, 0 Unknown, 258 Unchecked, 2.1s Time] [2021-11-19 13:47:53,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1663 states. [2021-11-19 13:47:53,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1663 to 1286. [2021-11-19 13:47:53,755 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) [2021-11-19 13:47:53,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1286 states to 1286 states and 1560 transitions. [2021-11-19 13:47:53,759 INFO L78 Accepts]: Start accepts. Automaton has 1286 states and 1560 transitions. Word has length 47 [2021-11-19 13:47:53,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:47:53,760 INFO L470 AbstractCegarLoop]: Abstraction has 1286 states and 1560 transitions. [2021-11-19 13:47:53,760 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) [2021-11-19 13:47:53,760 INFO L276 IsEmpty]: Start isEmpty. Operand 1286 states and 1560 transitions. [2021-11-19 13:47:53,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-19 13:47:53,762 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:47:53,762 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] [2021-11-19 13:47:53,800 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Forceful destruction successful, exit code 0 [2021-11-19 13:47:53,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (86)] Forceful destruction successful, exit code 0 [2021-11-19 13:47:54,185 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (87)] Forceful destruction successful, exit code 0 [2021-11-19 13:47:54,383 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 13:47:54,383 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:47:54,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:47:54,384 INFO L85 PathProgramCache]: Analyzing trace with hash 420978799, now seen corresponding path program 3 times [2021-11-19 13:47:54,384 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:47:54,384 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [89930108] [2021-11-19 13:47:54,384 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:47:54,385 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:47:54,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:47:54,385 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:47:54,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (89)] Waiting until timeout for monitored process [2021-11-19 13:47:54,677 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-19 13:47:54,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:47:54,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-19 13:47:54,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:47:55,112 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:47:55,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:47:56,682 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 [2021-11-19 13:47:57,435 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:47:57,435 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:47:57,435 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [89930108] [2021-11-19 13:47:57,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [89930108] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:47:57,436 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1698004639] [2021-11-19 13:47:57,436 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:47:57,436 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:47:57,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:47:57,443 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:47:57,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (90)] Waiting until timeout for monitored process [2021-11-19 13:47:58,398 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-19 13:47:58,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:47:58,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-19 13:47:58,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:47:58,605 INFO L354 Elim1Store]: treesize reduction 48, result has 21.3 percent of original size [2021-11-19 13:47:58,606 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 [2021-11-19 13:47:58,612 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:47:58,612 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 [2021-11-19 13:48:01,879 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:48:01,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:48:09,215 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:48:09,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1698004639] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:48:09,215 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [114028746] [2021-11-19 13:48:09,215 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-19 13:48:09,216 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:48:09,216 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:48:09,216 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:48:09,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-19 13:48:09,656 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-19 13:48:09,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:48:09,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-19 13:48:09,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:48:10,010 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:48:10,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:48:10,915 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 [2021-11-19 13:48:11,093 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:48:11,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [114028746] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:48:11,093 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:48:11,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 12, 12, 8, 9] total 36 [2021-11-19 13:48:11,094 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835869989] [2021-11-19 13:48:11,094 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:48:11,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-19 13:48:11,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:48:11,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-19 13:48:11,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=1125, Unknown=0, NotChecked=0, Total=1332 [2021-11-19 13:48:11,096 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) [2021-11-19 13:48:32,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:48:32,166 INFO L93 Difference]: Finished difference Result 2083 states and 2473 transitions. [2021-11-19 13:48:32,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-19 13:48:32,169 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 [2021-11-19 13:48:32,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:48:32,178 INFO L225 Difference]: With dead ends: 2083 [2021-11-19 13:48:32,178 INFO L226 Difference]: Without dead ends: 2083 [2021-11-19 13:48:32,180 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 246 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1227 ImplicationChecksByTransitivity, 23.5s TimeCoverageRelationStatistics Valid=791, Invalid=3901, Unknown=0, NotChecked=0, Total=4692 [2021-11-19 13:48:32,181 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 550 mSDsluCounter, 865 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s 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, 4.6s IncrementalHoareTripleChecker+Time [2021-11-19 13:48:32,181 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [550 Valid, 936 Invalid, 609 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 465 Invalid, 0 Unknown, 115 Unchecked, 4.6s Time] [2021-11-19 13:48:32,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2083 states. [2021-11-19 13:48:32,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2083 to 1356. [2021-11-19 13:48:32,205 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) [2021-11-19 13:48:32,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1356 states to 1356 states and 1644 transitions. [2021-11-19 13:48:32,209 INFO L78 Accepts]: Start accepts. Automaton has 1356 states and 1644 transitions. Word has length 47 [2021-11-19 13:48:32,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:48:32,209 INFO L470 AbstractCegarLoop]: Abstraction has 1356 states and 1644 transitions. [2021-11-19 13:48:32,210 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) [2021-11-19 13:48:32,210 INFO L276 IsEmpty]: Start isEmpty. Operand 1356 states and 1644 transitions. [2021-11-19 13:48:32,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-19 13:48:32,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:48:32,212 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] [2021-11-19 13:48:32,228 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (89)] Ended with exit code 0 [2021-11-19 13:48:32,455 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Forceful destruction successful, exit code 0 [2021-11-19 13:48:32,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (90)] Forceful destruction successful, exit code 0 [2021-11-19 13:48:32,831 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 13:48:32,831 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:48:32,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:48:32,832 INFO L85 PathProgramCache]: Analyzing trace with hash -240796018, now seen corresponding path program 4 times [2021-11-19 13:48:32,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:48:32,832 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [901735413] [2021-11-19 13:48:32,832 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:48:32,832 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:48:32,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:48:32,833 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:48:32,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (92)] Waiting until timeout for monitored process [2021-11-19 13:48:32,945 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:48:32,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:48:32,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-19 13:48:32,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:48:33,393 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 25 proven. 43 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:48:33,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:48:34,036 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 25 proven. 43 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:48:34,036 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:48:34,036 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [901735413] [2021-11-19 13:48:34,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [901735413] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:48:34,036 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2106115680] [2021-11-19 13:48:34,036 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:48:34,037 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:48:34,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:48:34,037 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:48:34,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (93)] Waiting until timeout for monitored process [2021-11-19 13:48:34,206 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:48:34,206 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:48:34,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-19 13:48:34,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:48:34,470 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 32 proven. 30 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-19 13:48:34,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:48:34,976 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 32 proven. 30 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-19 13:48:34,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2106115680] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:48:34,976 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [629445983] [2021-11-19 13:48:34,977 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:48:34,977 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:48:34,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:48:34,978 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:48:34,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2021-11-19 13:48:35,062 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:48:35,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:48:35,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-19 13:48:35,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:48:35,329 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 32 proven. 30 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-19 13:48:35,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:48:35,590 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 32 proven. 30 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-19 13:48:35,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [629445983] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:48:35,591 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:48:35,591 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13, 12, 13, 12] total 31 [2021-11-19 13:48:35,591 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859395049] [2021-11-19 13:48:35,591 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:48:35,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-19 13:48:35,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:48:35,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-19 13:48:35,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=779, Unknown=0, NotChecked=0, Total=930 [2021-11-19 13:48:35,593 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) [2021-11-19 13:48:38,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:48:38,365 INFO L93 Difference]: Finished difference Result 2806 states and 3335 transitions. [2021-11-19 13:48:38,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-19 13:48:38,366 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 [2021-11-19 13:48:38,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:48:38,382 INFO L225 Difference]: With dead ends: 2806 [2021-11-19 13:48:38,382 INFO L226 Difference]: Without dead ends: 2760 [2021-11-19 13:48:38,383 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 259 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 716 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=766, Invalid=2656, Unknown=0, NotChecked=0, Total=3422 [2021-11-19 13:48:38,384 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 886 mSDsluCounter, 1157 mSDsCounter, 0 mSdLazyCounter, 881 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s 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, 1.4s IncrementalHoareTripleChecker+Time [2021-11-19 13:48:38,384 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [886 Valid, 1243 Invalid, 967 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 881 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-19 13:48:38,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2760 states. [2021-11-19 13:48:38,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2760 to 2220. [2021-11-19 13:48:38,415 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) [2021-11-19 13:48:38,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2220 states to 2220 states and 2749 transitions. [2021-11-19 13:48:38,420 INFO L78 Accepts]: Start accepts. Automaton has 2220 states and 2749 transitions. Word has length 49 [2021-11-19 13:48:38,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:48:38,420 INFO L470 AbstractCegarLoop]: Abstraction has 2220 states and 2749 transitions. [2021-11-19 13:48:38,421 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) [2021-11-19 13:48:38,421 INFO L276 IsEmpty]: Start isEmpty. Operand 2220 states and 2749 transitions. [2021-11-19 13:48:38,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-19 13:48:38,423 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:48:38,423 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] [2021-11-19 13:48:38,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Forceful destruction successful, exit code 0 [2021-11-19 13:48:38,647 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (92)] Ended with exit code 0 [2021-11-19 13:48:38,841 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (93)] Forceful destruction successful, exit code 0 [2021-11-19 13:48:39,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 13:48:39,039 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:48:39,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:48:39,040 INFO L85 PathProgramCache]: Analyzing trace with hash -722595117, now seen corresponding path program 2 times [2021-11-19 13:48:39,040 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:48:39,040 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [234865501] [2021-11-19 13:48:39,040 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:48:39,040 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:48:39,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:48:39,041 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:48:39,042 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (95)] Waiting until timeout for monitored process [2021-11-19 13:48:39,172 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:48:39,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:48:39,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-19 13:48:39,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:48:39,257 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-19 13:48:39,257 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 [2021-11-19 13:48:39,263 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:48:39,263 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 [2021-11-19 13:48:44,820 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:48:44,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:48:47,761 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 29 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:48:47,761 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:48:47,761 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [234865501] [2021-11-19 13:48:47,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [234865501] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:48:47,761 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1384540395] [2021-11-19 13:48:47,761 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:48:47,761 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:48:47,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:48:47,762 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:48:47,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (96)] Waiting until timeout for monitored process [2021-11-19 13:48:47,964 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:48:47,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:48:47,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-19 13:48:47,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:48:48,152 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-19 13:48:48,152 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 43 treesize of output 46 [2021-11-19 13:48:48,159 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:48:48,159 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 [2021-11-19 13:48:55,455 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:48:55,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:48:59,136 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:48:59,136 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 [2021-11-19 13:48:59,145 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:48:59,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1384540395] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:48:59,146 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2042290792] [2021-11-19 13:48:59,146 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:48:59,146 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:48:59,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:48:59,147 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:48:59,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2021-11-19 13:48:59,242 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:48:59,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:48:59,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-19 13:48:59,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:49:00,385 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-19 13:49:00,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:49:01,369 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 [2021-11-19 13:49:02,912 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 1 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-19 13:49:02,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2042290792] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:49:02,913 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:49:02,913 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 12, 11, 8, 9] total 46 [2021-11-19 13:49:02,913 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910596160] [2021-11-19 13:49:02,913 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:49:02,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-19 13:49:02,914 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:49:02,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-19 13:49:02,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=1863, Unknown=0, NotChecked=0, Total=2162 [2021-11-19 13:49:02,915 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) [2021-11-19 13:49:13,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:49:13,308 INFO L93 Difference]: Finished difference Result 3227 states and 3948 transitions. [2021-11-19 13:49:13,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-19 13:49:13,310 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 [2021-11-19 13:49:13,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:49:13,323 INFO L225 Difference]: With dead ends: 3227 [2021-11-19 13:49:13,323 INFO L226 Difference]: Without dead ends: 3227 [2021-11-19 13:49:13,323 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 251 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1019 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=461, Invalid=2731, Unknown=0, NotChecked=0, Total=3192 [2021-11-19 13:49:13,324 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 168 mSDsluCounter, 664 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s 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, 1.6s IncrementalHoareTripleChecker+Time [2021-11-19 13:49:13,324 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [168 Valid, 700 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 193 Invalid, 0 Unknown, 61 Unchecked, 1.6s Time] [2021-11-19 13:49:13,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3227 states. [2021-11-19 13:49:13,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3227 to 2139. [2021-11-19 13:49:13,354 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) [2021-11-19 13:49:13,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2139 states to 2139 states and 2621 transitions. [2021-11-19 13:49:13,357 INFO L78 Accepts]: Start accepts. Automaton has 2139 states and 2621 transitions. Word has length 50 [2021-11-19 13:49:13,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:49:13,358 INFO L470 AbstractCegarLoop]: Abstraction has 2139 states and 2621 transitions. [2021-11-19 13:49:13,358 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) [2021-11-19 13:49:13,358 INFO L276 IsEmpty]: Start isEmpty. Operand 2139 states and 2621 transitions. [2021-11-19 13:49:13,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-19 13:49:13,360 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:49:13,360 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] [2021-11-19 13:49:13,371 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (96)] Forceful destruction successful, exit code 0 [2021-11-19 13:49:13,572 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (95)] Forceful destruction successful, exit code 0 [2021-11-19 13:49:13,790 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Ended with exit code 0 [2021-11-19 13:49:13,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:49:13,963 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:49:13,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:49:13,964 INFO L85 PathProgramCache]: Analyzing trace with hash -1022969014, now seen corresponding path program 4 times [2021-11-19 13:49:13,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:49:13,964 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1193892510] [2021-11-19 13:49:13,964 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:49:13,964 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:49:13,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:49:13,965 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:49:13,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (98)] Waiting until timeout for monitored process [2021-11-19 13:49:14,088 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:49:14,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:49:14,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-19 13:49:14,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:49:14,658 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:49:14,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:49:15,391 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:49:15,391 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:49:15,391 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1193892510] [2021-11-19 13:49:15,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1193892510] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:49:15,392 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1674602082] [2021-11-19 13:49:15,392 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:49:15,392 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:49:15,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:49:15,397 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:49:15,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (99)] Waiting until timeout for monitored process [2021-11-19 13:49:15,544 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:49:15,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:49:15,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-19 13:49:15,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:49:16,152 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:49:16,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:49:16,541 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:49:16,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1674602082] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:49:16,542 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780612648] [2021-11-19 13:49:16,542 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:49:16,542 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:49:16,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:49:16,543 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:49:16,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2021-11-19 13:49:16,620 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:49:16,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:49:16,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-19 13:49:16,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:49:16,989 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:49:16,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:49:17,278 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:49:17,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [780612648] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:49:17,278 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:49:17,278 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 12, 11, 13, 12] total 33 [2021-11-19 13:49:17,279 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170349970] [2021-11-19 13:49:17,279 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:49:17,279 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-19 13:49:17,279 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:49:17,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-19 13:49:17,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=899, Unknown=0, NotChecked=0, Total=1056 [2021-11-19 13:49:17,280 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) [2021-11-19 13:49:18,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:49:18,583 INFO L93 Difference]: Finished difference Result 2067 states and 2479 transitions. [2021-11-19 13:49:18,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-19 13:49:18,584 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 [2021-11-19 13:49:18,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:49:18,592 INFO L225 Difference]: With dead ends: 2067 [2021-11-19 13:49:18,592 INFO L226 Difference]: Without dead ends: 1839 [2021-11-19 13:49:18,592 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 274 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 492 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=390, Invalid=1680, Unknown=0, NotChecked=0, Total=2070 [2021-11-19 13:49:18,593 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 645 mSDsluCounter, 1075 mSDsCounter, 0 mSdLazyCounter, 578 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s 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 [2021-11-19 13:49:18,593 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] [2021-11-19 13:49:18,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1839 states. [2021-11-19 13:49:18,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1839 to 1593. [2021-11-19 13:49:18,614 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) [2021-11-19 13:49:18,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1593 states to 1593 states and 1929 transitions. [2021-11-19 13:49:18,617 INFO L78 Accepts]: Start accepts. Automaton has 1593 states and 1929 transitions. Word has length 52 [2021-11-19 13:49:18,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:49:18,617 INFO L470 AbstractCegarLoop]: Abstraction has 1593 states and 1929 transitions. [2021-11-19 13:49:18,618 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) [2021-11-19 13:49:18,618 INFO L276 IsEmpty]: Start isEmpty. Operand 1593 states and 1929 transitions. [2021-11-19 13:49:18,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-19 13:49:18,620 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:49:18,620 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] [2021-11-19 13:49:18,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Forceful destruction successful, exit code 0 [2021-11-19 13:49:18,835 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (99)] Ended with exit code 0 [2021-11-19 13:49:19,042 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (98)] Ended with exit code 0 [2021-11-19 13:49:19,234 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:49:19,234 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:49:19,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:49:19,234 INFO L85 PathProgramCache]: Analyzing trace with hash -958451034, now seen corresponding path program 1 times [2021-11-19 13:49:19,234 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:49:19,234 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [761064747] [2021-11-19 13:49:19,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:49:19,235 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:49:19,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:49:19,236 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:49:19,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (101)] Waiting until timeout for monitored process [2021-11-19 13:49:19,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:49:19,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-19 13:49:19,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:49:19,769 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 5 proven. 44 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-19 13:49:19,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:49:21,373 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 [2021-11-19 13:49:22,167 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 4 proven. 53 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-19 13:49:22,167 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:49:22,167 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [761064747] [2021-11-19 13:49:22,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [761064747] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:49:22,167 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1401611731] [2021-11-19 13:49:22,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:49:22,168 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:49:22,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:49:22,168 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:49:22,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (102)] Waiting until timeout for monitored process [2021-11-19 13:49:22,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:49:22,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-19 13:49:22,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:49:22,707 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 5 proven. 44 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-19 13:49:22,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:49:23,291 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 [2021-11-19 13:49:23,492 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 4 proven. 53 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-19 13:49:23,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1401611731] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:49:23,492 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [886274523] [2021-11-19 13:49:23,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 13:49:23,492 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:49:23,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:49:23,493 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:49:23,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2021-11-19 13:49:23,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 13:49:23,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-19 13:49:23,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:49:23,889 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 5 proven. 44 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-19 13:49:23,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:49:24,452 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 [2021-11-19 13:49:24,657 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 4 proven. 53 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-19 13:49:24,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [886274523] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:49:24,658 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:49:24,658 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 10, 13, 10, 13] total 22 [2021-11-19 13:49:24,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049798561] [2021-11-19 13:49:24,658 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:49:24,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-19 13:49:24,658 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:49:24,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-19 13:49:24,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2021-11-19 13:49:24,659 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) [2021-11-19 13:49:29,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:49:29,636 INFO L93 Difference]: Finished difference Result 2628 states and 3057 transitions. [2021-11-19 13:49:29,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-19 13:49:29,637 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 [2021-11-19 13:49:29,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:49:29,648 INFO L225 Difference]: With dead ends: 2628 [2021-11-19 13:49:29,648 INFO L226 Difference]: Without dead ends: 2557 [2021-11-19 13:49:29,648 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 291 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=539, Invalid=1717, Unknown=0, NotChecked=0, Total=2256 [2021-11-19 13:49:29,648 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 804 mSDsluCounter, 499 mSDsCounter, 0 mSdLazyCounter, 699 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s 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, 2.6s IncrementalHoareTripleChecker+Time [2021-11-19 13:49:29,649 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [804 Valid, 562 Invalid, 778 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 699 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2021-11-19 13:49:29,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2557 states. [2021-11-19 13:49:29,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2557 to 1531. [2021-11-19 13:49:29,670 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) [2021-11-19 13:49:29,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1531 states to 1531 states and 1841 transitions. [2021-11-19 13:49:29,674 INFO L78 Accepts]: Start accepts. Automaton has 1531 states and 1841 transitions. Word has length 53 [2021-11-19 13:49:29,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:49:29,674 INFO L470 AbstractCegarLoop]: Abstraction has 1531 states and 1841 transitions. [2021-11-19 13:49:29,675 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) [2021-11-19 13:49:29,675 INFO L276 IsEmpty]: Start isEmpty. Operand 1531 states and 1841 transitions. [2021-11-19 13:49:29,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-19 13:49:29,677 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:49:29,677 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] [2021-11-19 13:49:29,687 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (102)] Forceful destruction successful, exit code 0 [2021-11-19 13:49:29,904 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Ended with exit code 0 [2021-11-19 13:49:30,095 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (101)] Forceful destruction successful, exit code 0 [2021-11-19 13:49:30,280 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:49:30,280 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:49:30,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:49:30,280 INFO L85 PathProgramCache]: Analyzing trace with hash -878193103, now seen corresponding path program 2 times [2021-11-19 13:49:30,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:49:30,281 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [651263544] [2021-11-19 13:49:30,281 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:49:30,281 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:49:30,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:49:30,282 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:49:30,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (104)] Waiting until timeout for monitored process [2021-11-19 13:49:30,427 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:49:30,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:49:30,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-19 13:49:30,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:49:30,514 INFO L354 Elim1Store]: treesize reduction 42, result has 35.4 percent of original size [2021-11-19 13:49:30,515 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 [2021-11-19 13:49:31,610 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:49:31,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:49:34,437 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 9 proven. 41 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:49:34,437 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:49:34,438 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [651263544] [2021-11-19 13:49:34,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [651263544] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:49:34,438 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [666418335] [2021-11-19 13:49:34,438 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:49:34,438 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:49:34,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:49:34,440 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:49:34,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (105)] Waiting until timeout for monitored process [2021-11-19 13:49:34,776 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:49:34,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:49:34,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-19 13:49:34,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:49:34,852 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-19 13:49:34,853 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 [2021-11-19 13:49:34,865 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:49:34,865 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 [2021-11-19 13:49:49,655 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:49:49,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:49:52,975 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:49:52,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [666418335] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:49:52,975 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1902539253] [2021-11-19 13:49:52,975 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:49:52,975 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:49:52,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:49:52,982 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:49:52,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2021-11-19 13:49:53,096 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:49:53,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:49:53,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-19 13:49:53,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:49:53,188 INFO L354 Elim1Store]: treesize reduction 42, result has 35.4 percent of original size [2021-11-19 13:49:53,188 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 [2021-11-19 13:49:54,899 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:49:54,899 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:49:58,129 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:49:58,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1902539253] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:49:58,129 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:49:58,129 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 12, 11, 11, 11] total 47 [2021-11-19 13:49:58,129 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72412680] [2021-11-19 13:49:58,130 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:49:58,130 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-19 13:49:58,130 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:49:58,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-19 13:49:58,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=1878, Unknown=0, NotChecked=0, Total=2256 [2021-11-19 13:49:58,131 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) [2021-11-19 13:50:01,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:50:01,785 INFO L93 Difference]: Finished difference Result 2494 states and 2981 transitions. [2021-11-19 13:50:01,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-19 13:50:01,788 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 [2021-11-19 13:50:01,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:50:01,800 INFO L225 Difference]: With dead ends: 2494 [2021-11-19 13:50:01,800 INFO L226 Difference]: Without dead ends: 2371 [2021-11-19 13:50:01,801 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 285 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1179 ImplicationChecksByTransitivity, 17.3s TimeCoverageRelationStatistics Valid=521, Invalid=2341, Unknown=0, NotChecked=0, Total=2862 [2021-11-19 13:50:01,801 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 201 mSDsluCounter, 627 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s 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, 1.9s IncrementalHoareTripleChecker+Time [2021-11-19 13:50:01,802 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [201 Valid, 671 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 210 Invalid, 0 Unknown, 118 Unchecked, 1.9s Time] [2021-11-19 13:50:01,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2371 states. [2021-11-19 13:50:01,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2371 to 1429. [2021-11-19 13:50:01,826 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) [2021-11-19 13:50:01,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1429 states to 1429 states and 1738 transitions. [2021-11-19 13:50:01,830 INFO L78 Accepts]: Start accepts. Automaton has 1429 states and 1738 transitions. Word has length 56 [2021-11-19 13:50:01,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:50:01,830 INFO L470 AbstractCegarLoop]: Abstraction has 1429 states and 1738 transitions. [2021-11-19 13:50:01,831 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) [2021-11-19 13:50:01,831 INFO L276 IsEmpty]: Start isEmpty. Operand 1429 states and 1738 transitions. [2021-11-19 13:50:01,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-19 13:50:01,833 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:50:01,833 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] [2021-11-19 13:50:01,846 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (104)] Ended with exit code 0 [2021-11-19 13:50:02,067 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Ended with exit code 0 [2021-11-19 13:50:02,246 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (105)] Ended with exit code 0 [2021-11-19 13:50:02,443 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt [2021-11-19 13:50:02,443 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:50:02,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:50:02,444 INFO L85 PathProgramCache]: Analyzing trace with hash -564407577, now seen corresponding path program 5 times [2021-11-19 13:50:02,444 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:50:02,444 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [131178771] [2021-11-19 13:50:02,444 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-19 13:50:02,444 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:50:02,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:50:02,446 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:50:02,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (107)] Waiting until timeout for monitored process [2021-11-19 13:50:02,823 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-19 13:50:02,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:50:02,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-19 13:50:02,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:50:03,372 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:50:03,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:50:04,966 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 [2021-11-19 13:50:06,133 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:50:06,134 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:50:06,134 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [131178771] [2021-11-19 13:50:06,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [131178771] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:50:06,134 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1989169054] [2021-11-19 13:50:06,134 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-19 13:50:06,134 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:50:06,134 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:50:06,135 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:50:06,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (108)] Waiting until timeout for monitored process [2021-11-19 13:51:05,804 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-19 13:51:05,804 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:51:05,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-19 13:51:05,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:51:06,294 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:51:06,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:51:07,080 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 [2021-11-19 13:51:07,321 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:51:07,321 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1989169054] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:51:07,321 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470657072] [2021-11-19 13:51:07,321 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-19 13:51:07,322 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:51:07,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:51:07,323 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:51:07,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2021-11-19 13:51:12,488 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-19 13:51:12,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:51:12,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-19 13:51:12,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:51:12,913 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:51:12,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:51:13,649 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 [2021-11-19 13:51:13,870 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-19 13:51:13,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470657072] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:51:13,870 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:51:13,870 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10, 10] total 19 [2021-11-19 13:51:13,871 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771582251] [2021-11-19 13:51:13,871 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:51:13,871 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-19 13:51:13,871 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:51:13,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-19 13:51:13,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=322, Unknown=0, NotChecked=0, Total=380 [2021-11-19 13:51:13,872 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) [2021-11-19 13:51:21,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:51:21,450 INFO L93 Difference]: Finished difference Result 8810 states and 10738 transitions. [2021-11-19 13:51:21,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-19 13:51:21,452 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 [2021-11-19 13:51:21,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:51:21,473 INFO L225 Difference]: With dead ends: 8810 [2021-11-19 13:51:21,473 INFO L226 Difference]: Without dead ends: 8810 [2021-11-19 13:51:21,474 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 541 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=509, Invalid=2247, Unknown=0, NotChecked=0, Total=2756 [2021-11-19 13:51:21,475 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, 3.4s IncrementalHoareTripleChecker+Time [2021-11-19 13:51:21,475 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2220 Valid, 930 Invalid, 1028 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 895 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2021-11-19 13:51:21,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8810 states. [2021-11-19 13:51:21,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8810 to 1782. [2021-11-19 13:51:21,541 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) [2021-11-19 13:51:21,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1782 states to 1782 states and 2161 transitions. [2021-11-19 13:51:21,546 INFO L78 Accepts]: Start accepts. Automaton has 1782 states and 2161 transitions. Word has length 56 [2021-11-19 13:51:21,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:51:21,546 INFO L470 AbstractCegarLoop]: Abstraction has 1782 states and 2161 transitions. [2021-11-19 13:51:21,547 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) [2021-11-19 13:51:21,547 INFO L276 IsEmpty]: Start isEmpty. Operand 1782 states and 2161 transitions. [2021-11-19 13:51:21,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-19 13:51:21,549 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:51:21,549 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] [2021-11-19 13:51:21,573 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (108)] Forceful destruction successful, exit code 0 [2021-11-19 13:51:21,773 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (107)] Ended with exit code 0 [2021-11-19 13:51:21,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Forceful destruction successful, exit code 0 [2021-11-19 13:51:22,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:51:22,163 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:51:22,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:51:22,164 INFO L85 PathProgramCache]: Analyzing trace with hash -1544267116, now seen corresponding path program 5 times [2021-11-19 13:51:22,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:51:22,164 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1473400828] [2021-11-19 13:51:22,164 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-19 13:51:22,165 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:51:22,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:51:22,165 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:51:22,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (110)] Waiting until timeout for monitored process [2021-11-19 13:51:22,460 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-19 13:51:22,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:51:22,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-19 13:51:22,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:51:23,028 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:51:23,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:51:24,860 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 15 proven. 85 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:51:24,860 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:51:24,860 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1473400828] [2021-11-19 13:51:24,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1473400828] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:51:24,860 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1417610786] [2021-11-19 13:51:24,860 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-19 13:51:24,860 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:51:24,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:51:24,861 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:51:24,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (111)] Waiting until timeout for monitored process [2021-11-19 13:51:51,441 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-19 13:51:51,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:51:51,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-19 13:51:51,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:51:52,473 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:51:52,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:51:54,008 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 11 proven. 89 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:51:54,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1417610786] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:51:54,008 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1239581045] [2021-11-19 13:51:54,008 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-19 13:51:54,008 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:51:54,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:51:54,009 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:51:54,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Waiting until timeout for monitored process [2021-11-19 13:52:10,921 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-19 13:52:10,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:52:10,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-19 13:52:10,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:52:12,048 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:52:12,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:52:12,525 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:52:12,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1239581045] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:52:12,525 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:52:12,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 18, 18, 20, 17] total 66 [2021-11-19 13:52:12,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057113734] [2021-11-19 13:52:12,526 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:52:12,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-19 13:52:12,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:52:12,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-19 13:52:12,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=505, Invalid=3785, Unknown=0, NotChecked=0, Total=4290 [2021-11-19 13:52:12,527 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) [2021-11-19 13:52:19,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:52:19,084 INFO L93 Difference]: Finished difference Result 3144 states and 3660 transitions. [2021-11-19 13:52:19,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-19 13:52:19,086 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 [2021-11-19 13:52:19,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:52:19,090 INFO L225 Difference]: With dead ends: 3144 [2021-11-19 13:52:19,090 INFO L226 Difference]: Without dead ends: 3117 [2021-11-19 13:52:19,091 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 273 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3549 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=1693, Invalid=9019, Unknown=0, NotChecked=0, Total=10712 [2021-11-19 13:52:19,091 INFO L933 BasicCegarLoop]: 179 mSDtfsCounter, 1818 mSDsluCounter, 3251 mSDsCounter, 0 mSdLazyCounter, 2404 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s 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, 3.5s IncrementalHoareTripleChecker+Time [2021-11-19 13:52:19,092 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1818 Valid, 3430 Invalid, 2540 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 2404 Invalid, 0 Unknown, 0 Unchecked, 3.5s Time] [2021-11-19 13:52:19,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3117 states. [2021-11-19 13:52:19,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3117 to 2261. [2021-11-19 13:52:19,119 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) [2021-11-19 13:52:19,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2261 states to 2261 states and 2789 transitions. [2021-11-19 13:52:19,122 INFO L78 Accepts]: Start accepts. Automaton has 2261 states and 2789 transitions. Word has length 57 [2021-11-19 13:52:19,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:52:19,122 INFO L470 AbstractCegarLoop]: Abstraction has 2261 states and 2789 transitions. [2021-11-19 13:52:19,122 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) [2021-11-19 13:52:19,122 INFO L276 IsEmpty]: Start isEmpty. Operand 2261 states and 2789 transitions. [2021-11-19 13:52:19,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-19 13:52:19,124 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:52:19,124 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] [2021-11-19 13:52:19,182 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Forceful destruction successful, exit code 0 [2021-11-19 13:52:19,347 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (111)] Ended with exit code 0 [2021-11-19 13:52:19,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (110)] Forceful destruction successful, exit code 0 [2021-11-19 13:52:19,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:52:19,739 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:52:19,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:52:19,740 INFO L85 PathProgramCache]: Analyzing trace with hash -987577769, now seen corresponding path program 6 times [2021-11-19 13:52:19,740 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:52:19,740 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2126827671] [2021-11-19 13:52:19,740 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-19 13:52:19,740 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:52:19,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:52:19,741 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:52:19,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (113)] Waiting until timeout for monitored process [2021-11-19 13:52:19,995 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-19 13:52:19,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:52:20,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-19 13:52:20,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:52:20,069 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:52:20,070 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 [2021-11-19 13:52:20,073 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 [2021-11-19 13:52:38,330 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-19 13:52:38,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:52:42,078 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 [2021-11-19 13:52:42,216 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-19 13:52:42,217 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:52:42,217 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2126827671] [2021-11-19 13:52:42,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2126827671] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:52:42,217 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [915940581] [2021-11-19 13:52:42,217 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-19 13:52:42,217 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:52:42,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:52:42,218 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:52:42,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (114)] Waiting until timeout for monitored process [2021-11-19 13:52:42,942 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-19 13:52:42,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:52:42,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-19 13:52:42,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:52:43,008 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:52:43,008 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 [2021-11-19 13:52:43,011 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 [2021-11-19 13:52:47,777 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-19 13:52:47,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:52:56,216 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 [2021-11-19 13:52:56,247 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-19 13:52:56,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [915940581] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:52:56,247 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1742330058] [2021-11-19 13:52:56,247 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-19 13:52:56,247 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:52:56,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:52:56,248 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:52:56,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2021-11-19 13:52:57,164 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-19 13:52:57,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:52:57,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-19 13:52:57,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:52:57,233 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:52:57,234 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 [2021-11-19 13:52:57,237 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 [2021-11-19 13:53:21,598 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:53:21,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:53:28,897 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 [2021-11-19 13:53:28,920 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 21 proven. 100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-19 13:53:28,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1742330058] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:53:28,921 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:53:28,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 14, 14, 17, 18] total 64 [2021-11-19 13:53:28,921 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139128695] [2021-11-19 13:53:28,921 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:53:28,921 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-19 13:53:28,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:53:28,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-19 13:53:28,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=549, Invalid=3611, Unknown=0, NotChecked=0, Total=4160 [2021-11-19 13:53:28,923 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) [2021-11-19 13:54:27,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:54:27,253 INFO L93 Difference]: Finished difference Result 2573 states and 3177 transitions. [2021-11-19 13:54:27,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-19 13:54:27,253 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 [2021-11-19 13:54:27,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:54:27,257 INFO L225 Difference]: With dead ends: 2573 [2021-11-19 13:54:27,258 INFO L226 Difference]: Without dead ends: 2573 [2021-11-19 13:54:27,260 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 315 SyntacticMatches, 19 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4240 ImplicationChecksByTransitivity, 110.9s TimeCoverageRelationStatistics Valid=1633, Invalid=8467, Unknown=0, NotChecked=0, Total=10100 [2021-11-19 13:54:27,260 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 95 mSDsluCounter, 872 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s 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, 1.5s IncrementalHoareTripleChecker+Time [2021-11-19 13:54:27,261 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 911 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 128 Invalid, 0 Unknown, 134 Unchecked, 1.5s Time] [2021-11-19 13:54:27,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2573 states. [2021-11-19 13:54:27,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2573 to 2364. [2021-11-19 13:54:27,289 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) [2021-11-19 13:54:27,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2364 states to 2364 states and 2929 transitions. [2021-11-19 13:54:27,293 INFO L78 Accepts]: Start accepts. Automaton has 2364 states and 2929 transitions. Word has length 61 [2021-11-19 13:54:27,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:54:27,293 INFO L470 AbstractCegarLoop]: Abstraction has 2364 states and 2929 transitions. [2021-11-19 13:54:27,294 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) [2021-11-19 13:54:27,294 INFO L276 IsEmpty]: Start isEmpty. Operand 2364 states and 2929 transitions. [2021-11-19 13:54:27,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-19 13:54:27,296 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:54:27,296 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] [2021-11-19 13:54:27,299 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (114)] Forceful destruction successful, exit code 0 [2021-11-19 13:54:27,536 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Forceful destruction successful, exit code 0 [2021-11-19 13:54:27,720 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (113)] Ended with exit code 0 [2021-11-19 13:54:27,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:54:27,911 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:54:27,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:54:27,912 INFO L85 PathProgramCache]: Analyzing trace with hash 1746378977, now seen corresponding path program 2 times [2021-11-19 13:54:27,912 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:54:27,912 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [104904278] [2021-11-19 13:54:27,912 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:54:27,912 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:54:27,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:54:27,913 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:54:27,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (116)] Waiting until timeout for monitored process [2021-11-19 13:54:28,055 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:54:28,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:54:28,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-19 13:54:28,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:54:28,121 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:54:28,121 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 [2021-11-19 13:54:28,123 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 [2021-11-19 13:54:33,565 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 34 proven. 49 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-19 13:54:33,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:54:36,209 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 10 proven. 73 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-19 13:54:36,209 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:54:36,209 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [104904278] [2021-11-19 13:54:36,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [104904278] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:54:36,209 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [168514041] [2021-11-19 13:54:36,210 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:54:36,210 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:54:36,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:54:36,210 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:54:36,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (117)] Waiting until timeout for monitored process [2021-11-19 13:54:36,413 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:54:36,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:54:36,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-19 13:54:36,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:54:36,469 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-19 13:54:36,469 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 [2021-11-19 13:54:36,472 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 [2021-11-19 13:54:57,325 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 34 proven. 49 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-19 13:54:57,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:55:00,145 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 [2021-11-19 13:55:00,153 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-19 13:55:00,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [168514041] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:55:00,154 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [412173840] [2021-11-19 13:55:00,154 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-19 13:55:00,154 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:55:00,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:55:00,155 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:55:00,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Waiting until timeout for monitored process [2021-11-19 13:55:00,251 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-19 13:55:00,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:55:00,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-19 13:55:00,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:55:01,816 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 34 proven. 49 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-19 13:55:01,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:55:02,330 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 [2021-11-19 13:55:04,470 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-19 13:55:04,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [412173840] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:55:04,470 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:55:04,470 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 15, 14, 12, 12] total 60 [2021-11-19 13:55:04,471 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669488823] [2021-11-19 13:55:04,471 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:55:04,471 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-19 13:55:04,471 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:55:04,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-19 13:55:04,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=480, Invalid=3180, Unknown=0, NotChecked=0, Total=3660 [2021-11-19 13:55:04,472 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) [2021-11-19 13:55:19,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:55:19,440 INFO L93 Difference]: Finished difference Result 3035 states and 3673 transitions. [2021-11-19 13:55:19,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-19 13:55:19,444 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 [2021-11-19 13:55:19,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:55:19,449 INFO L225 Difference]: With dead ends: 3035 [2021-11-19 13:55:19,449 INFO L226 Difference]: Without dead ends: 3003 [2021-11-19 13:55:19,450 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 305 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2529 ImplicationChecksByTransitivity, 42.7s TimeCoverageRelationStatistics Valid=827, Invalid=5653, Unknown=0, NotChecked=0, Total=6480 [2021-11-19 13:55:19,450 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 122 mSDsluCounter, 717 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s 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, 2.0s IncrementalHoareTripleChecker+Time [2021-11-19 13:55:19,451 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 761 Invalid, 682 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 362 Invalid, 0 Unknown, 317 Unchecked, 2.0s Time] [2021-11-19 13:55:19,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3003 states. [2021-11-19 13:55:19,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3003 to 2526. [2021-11-19 13:55:19,486 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) [2021-11-19 13:55:19,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2526 states to 2526 states and 3121 transitions. [2021-11-19 13:55:19,491 INFO L78 Accepts]: Start accepts. Automaton has 2526 states and 3121 transitions. Word has length 61 [2021-11-19 13:55:19,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:55:19,491 INFO L470 AbstractCegarLoop]: Abstraction has 2526 states and 3121 transitions. [2021-11-19 13:55:19,492 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) [2021-11-19 13:55:19,492 INFO L276 IsEmpty]: Start isEmpty. Operand 2526 states and 3121 transitions. [2021-11-19 13:55:19,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-19 13:55:19,494 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:55:19,494 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] [2021-11-19 13:55:19,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (117)] Forceful destruction successful, exit code 0 [2021-11-19 13:55:19,720 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Ended with exit code 0 [2021-11-19 13:55:19,906 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (116)] Ended with exit code 0 [2021-11-19 13:55:20,097 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:55:20,097 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:55:20,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:55:20,098 INFO L85 PathProgramCache]: Analyzing trace with hash 1288171396, now seen corresponding path program 6 times [2021-11-19 13:55:20,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:55:20,098 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1731757161] [2021-11-19 13:55:20,098 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-19 13:55:20,098 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:55:20,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:55:20,099 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:55:20,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (119)] Waiting until timeout for monitored process [2021-11-19 13:55:20,293 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-11-19 13:55:20,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:55:20,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-19 13:55:20,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:55:20,383 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-19 13:55:20,384 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 [2021-11-19 13:55:20,389 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:55:20,389 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 [2021-11-19 13:55:26,145 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 1 proven. 76 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-19 13:55:26,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:55:29,728 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:55:29,728 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 [2021-11-19 13:55:29,888 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 1 proven. 76 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-19 13:55:29,889 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:55:29,889 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1731757161] [2021-11-19 13:55:29,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1731757161] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:55:29,889 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1851055762] [2021-11-19 13:55:29,889 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-19 13:55:29,889 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:55:29,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:55:29,891 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:55:29,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (120)] Waiting until timeout for monitored process [2021-11-19 13:55:30,301 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-11-19 13:55:30,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:55:30,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-19 13:55:30,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:55:30,455 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-19 13:55:30,455 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 43 treesize of output 46 [2021-11-19 13:55:30,462 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:55:30,462 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 [2021-11-19 13:55:35,944 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 1 proven. 76 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-19 13:55:35,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:55:40,936 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:55:40,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 128 treesize of output 124 [2021-11-19 13:55:40,976 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 1 proven. 76 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-19 13:55:40,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1851055762] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:55:40,976 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1444886257] [2021-11-19 13:55:40,976 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-19 13:55:40,977 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:55:40,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:55:41,002 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:55:41,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Waiting until timeout for monitored process [2021-11-19 13:55:41,242 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-11-19 13:55:41,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:55:41,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-19 13:55:41,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:55:41,309 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-19 13:55:41,310 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 [2021-11-19 13:55:41,315 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:55:41,315 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 [2021-11-19 13:55:46,282 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 1 proven. 76 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-19 13:55:46,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:55:48,415 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-19 13:55:48,416 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 [2021-11-19 13:55:48,455 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 1 proven. 76 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-19 13:55:48,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1444886257] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:55:48,455 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-19 13:55:48,455 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10, 10] total 30 [2021-11-19 13:55:48,456 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53176693] [2021-11-19 13:55:48,456 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-19 13:55:48,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-19 13:55:48,456 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-19 13:55:48,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-19 13:55:48,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=740, Unknown=0, NotChecked=0, Total=930 [2021-11-19 13:55:48,457 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) [2021-11-19 13:55:53,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 13:55:53,953 INFO L93 Difference]: Finished difference Result 3517 states and 4333 transitions. [2021-11-19 13:55:53,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-19 13:55:53,953 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 [2021-11-19 13:55:53,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 13:55:53,963 INFO L225 Difference]: With dead ends: 3517 [2021-11-19 13:55:53,963 INFO L226 Difference]: Without dead ends: 3517 [2021-11-19 13:55:53,963 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 355 SyntacticMatches, 4 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 516 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=427, Invalid=1465, Unknown=0, NotChecked=0, Total=1892 [2021-11-19 13:55:53,964 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 [2021-11-19 13:55:53,964 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] [2021-11-19 13:55:53,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3517 states. [2021-11-19 13:55:54,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3517 to 3221. [2021-11-19 13:55:54,016 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) [2021-11-19 13:55:54,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3221 states to 3221 states and 4016 transitions. [2021-11-19 13:55:54,021 INFO L78 Accepts]: Start accepts. Automaton has 3221 states and 4016 transitions. Word has length 64 [2021-11-19 13:55:54,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 13:55:54,022 INFO L470 AbstractCegarLoop]: Abstraction has 3221 states and 4016 transitions. [2021-11-19 13:55:54,022 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) [2021-11-19 13:55:54,022 INFO L276 IsEmpty]: Start isEmpty. Operand 3221 states and 4016 transitions. [2021-11-19 13:55:54,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-19 13:55:54,024 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 13:55:54,024 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] [2021-11-19 13:55:54,028 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (120)] Ended with exit code 0 [2021-11-19 13:55:54,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Forceful destruction successful, exit code 0 [2021-11-19 13:55:54,447 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (119)] Ended with exit code 0 [2021-11-19 13:55:54,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt,121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 [2021-11-19 13:55:54,639 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-19 13:55:54,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 13:55:54,640 INFO L85 PathProgramCache]: Analyzing trace with hash -1942992570, now seen corresponding path program 4 times [2021-11-19 13:55:54,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-19 13:55:54,640 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1448090982] [2021-11-19 13:55:54,640 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:55:54,640 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-19 13:55:54,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat [2021-11-19 13:55:54,642 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-19 13:55:54,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/mathsat -unsat_core_generation=3 (122)] Waiting until timeout for monitored process [2021-11-19 13:55:54,796 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:55:54,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:55:54,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-19 13:55:54,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:55:55,414 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 12 proven. 92 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-19 13:55:55,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:55:56,098 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 12 proven. 92 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-19 13:55:56,098 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-19 13:55:56,098 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1448090982] [2021-11-19 13:55:56,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1448090982] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:55:56,098 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1962236593] [2021-11-19 13:55:56,098 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:55:56,099 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-19 13:55:56,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 [2021-11-19 13:55:56,099 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-19 13:55:56,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/cvc4 --incremental --print-success --lang smt (123)] Waiting until timeout for monitored process [2021-11-19 13:55:56,290 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-19 13:55:56,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-19 13:55:56,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-19 13:55:56,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-19 13:55:57,006 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 12 proven. 92 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-19 13:55:57,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-19 13:55:57,784 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 12 proven. 92 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-19 13:55:57,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1962236593] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-19 13:55:57,784 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1833449371] [2021-11-19 13:55:57,784 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-19 13:55:57,784 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 13:55:57,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 13:55:57,785 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 13:55:57,786 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_621652e2-c629-4882-962f-5df05bd80e15/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Waiting until timeout for monitored process