./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 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/diff-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF --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-63182f1 [2021-11-12 22:35:29,375 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 22:35:29,378 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 22:35:29,430 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 22:35:29,431 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 22:35:29,435 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 22:35:29,437 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 22:35:29,441 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 22:35:29,444 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 22:35:29,449 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 22:35:29,451 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 22:35:29,452 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 22:35:29,453 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 22:35:29,456 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 22:35:29,458 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 22:35:29,463 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 22:35:29,464 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 22:35:29,466 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 22:35:29,468 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 22:35:29,478 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 22:35:29,480 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 22:35:29,481 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 22:35:29,485 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 22:35:29,486 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 22:35:29,495 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 22:35:29,496 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 22:35:29,496 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 22:35:29,499 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 22:35:29,499 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 22:35:29,501 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 22:35:29,502 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 22:35:29,503 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 22:35:29,505 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 22:35:29,506 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 22:35:29,508 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 22:35:29,508 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 22:35:29,509 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 22:35:29,509 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 22:35:29,509 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 22:35:29,510 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 22:35:29,511 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 22:35:29,512 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-12 22:35:29,555 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 22:35:29,558 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 22:35:29,560 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 22:35:29,560 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 22:35:29,560 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 22:35:29,566 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 22:35:29,567 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 22:35:29,567 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 22:35:29,567 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 22:35:29,567 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 22:35:29,569 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 22:35:29,569 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 22:35:29,569 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 22:35:29,569 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 22:35:29,570 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 22:35:29,570 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 22:35:29,570 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-12 22:35:29,571 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-12 22:35:29,571 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 22:35:29,571 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 22:35:29,571 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-12 22:35:29,572 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 22:35:29,572 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 22:35:29,572 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 22:35:29,572 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-12 22:35:29,573 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-12 22:35:29,575 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-12 22:35:29,575 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 22:35:29,575 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 22:35:29,575 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 22:35:29,576 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 22:35:29,576 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 22:35:29,576 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 22:35:29,576 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:35:29,577 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 22:35:29,577 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 22:35:29,577 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 22:35:29,577 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 22:35:29,578 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 22:35:29,578 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 22:35:29,578 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_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5cc33a4b6801f9f06dbbb17ff694aba4439c76c6a2b62ec290c2132cc01ea0fe [2021-11-12 22:35:29,947 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 22:35:29,991 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 22:35:29,995 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 22:35:29,996 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 22:35:29,997 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 22:35:29,999 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/array-memsafety/diff-alloca-2.i [2021-11-12 22:35:30,071 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/data/8b0cdd917/adebbb6b74954e839ecb1185a359987d/FLAG966458812 [2021-11-12 22:35:30,745 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 22:35:30,746 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/sv-benchmarks/c/array-memsafety/diff-alloca-2.i [2021-11-12 22:35:30,758 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/data/8b0cdd917/adebbb6b74954e839ecb1185a359987d/FLAG966458812 [2021-11-12 22:35:31,036 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/data/8b0cdd917/adebbb6b74954e839ecb1185a359987d [2021-11-12 22:35:31,038 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 22:35:31,040 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 22:35:31,042 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 22:35:31,042 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 22:35:31,045 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 22:35:31,046 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:35:31" (1/1) ... [2021-11-12 22:35:31,047 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1bf79c11 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:35:31, skipping insertion in model container [2021-11-12 22:35:31,048 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:35:31" (1/1) ... [2021-11-12 22:35:31,055 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 22:35:31,096 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 22:35:31,479 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:35:31,491 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-11-12 22:35:31,491 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@27f3fa85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:35:31, skipping insertion in model container [2021-11-12 22:35:31,492 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 22:35:31,492 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-12 22:35:31,495 INFO L158 Benchmark]: Toolchain (without parser) took 453.42ms. Allocated memory is still 109.1MB. Free memory was 72.5MB in the beginning and 83.0MB in the end (delta: -10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-12 22:35:31,496 INFO L158 Benchmark]: CDTParser took 0.28ms. Allocated memory is still 79.7MB. Free memory was 52.8MB in the beginning and 52.7MB in the end (delta: 25.5kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-12 22:35:31,497 INFO L158 Benchmark]: CACSL2BoogieTranslator took 450.50ms. Allocated memory is still 109.1MB. Free memory was 72.4MB in the beginning and 83.0MB in the end (delta: -10.6MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-12 22:35:31,499 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28ms. Allocated memory is still 79.7MB. Free memory was 52.8MB in the beginning and 52.7MB in the end (delta: 25.5kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 450.50ms. Allocated memory is still 109.1MB. Free memory was 72.4MB in the beginning and 83.0MB in the end (delta: -10.6MB). Peak memory consumption was 10.5MB. 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_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/diff-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF --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-63182f1 [2021-11-12 22:35:34,015 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 22:35:34,019 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 22:35:34,077 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 22:35:34,078 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 22:35:34,083 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 22:35:34,085 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 22:35:34,089 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 22:35:34,093 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 22:35:34,103 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 22:35:34,105 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 22:35:34,107 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 22:35:34,107 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 22:35:34,110 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 22:35:34,111 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 22:35:34,113 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 22:35:34,114 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 22:35:34,115 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 22:35:34,117 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 22:35:34,119 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 22:35:34,121 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 22:35:34,123 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 22:35:34,124 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 22:35:34,125 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 22:35:34,128 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 22:35:34,129 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 22:35:34,129 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 22:35:34,131 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 22:35:34,131 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 22:35:34,132 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 22:35:34,133 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 22:35:34,134 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 22:35:34,135 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 22:35:34,136 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 22:35:34,137 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 22:35:34,137 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 22:35:34,138 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 22:35:34,162 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 22:35:34,162 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 22:35:34,163 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 22:35:34,164 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 22:35:34,165 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2021-11-12 22:35:34,195 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 22:35:34,197 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 22:35:34,199 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 22:35:34,199 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 22:35:34,200 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 22:35:34,200 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 22:35:34,200 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 22:35:34,200 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 22:35:34,200 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 22:35:34,201 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 22:35:34,203 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-12 22:35:34,204 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-12 22:35:34,204 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 22:35:34,204 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 22:35:34,205 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-12 22:35:34,205 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 22:35:34,205 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 22:35:34,205 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 22:35:34,206 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-12 22:35:34,206 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-12 22:35:34,206 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-12 22:35:34,206 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 22:35:34,206 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 22:35:34,207 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-12 22:35:34,207 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-12 22:35:34,207 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 22:35:34,207 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 22:35:34,208 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 22:35:34,208 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-12 22:35:34,208 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 22:35:34,208 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:35:34,209 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 22:35:34,209 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 22:35:34,209 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-12 22:35:34,210 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-12 22:35:34,210 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 22:35:34,210 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 22:35:34,211 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_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5cc33a4b6801f9f06dbbb17ff694aba4439c76c6a2b62ec290c2132cc01ea0fe [2021-11-12 22:35:34,664 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 22:35:34,697 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 22:35:34,701 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 22:35:34,703 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 22:35:34,704 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 22:35:34,705 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/array-memsafety/diff-alloca-2.i [2021-11-12 22:35:34,793 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/data/b49e00e6e/53dbf57eac624e099761356e2721c49d/FLAGfe538cb0b [2021-11-12 22:35:35,426 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 22:35:35,427 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/sv-benchmarks/c/array-memsafety/diff-alloca-2.i [2021-11-12 22:35:35,442 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/data/b49e00e6e/53dbf57eac624e099761356e2721c49d/FLAGfe538cb0b [2021-11-12 22:35:35,710 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/data/b49e00e6e/53dbf57eac624e099761356e2721c49d [2021-11-12 22:35:35,714 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 22:35:35,717 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 22:35:35,719 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 22:35:35,719 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 22:35:35,723 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 22:35:35,725 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:35:35" (1/1) ... [2021-11-12 22:35:35,727 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@31059b45 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:35:35, skipping insertion in model container [2021-11-12 22:35:35,727 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:35:35" (1/1) ... [2021-11-12 22:35:35,736 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 22:35:35,811 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 22:35:36,225 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:35:36,245 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-12 22:35:36,264 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 22:35:36,340 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:35:36,349 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 22:35:36,430 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:35:36,465 INFO L208 MainTranslator]: Completed translation [2021-11-12 22:35:36,466 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:35:36 WrapperNode [2021-11-12 22:35:36,466 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 22:35:36,467 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 22:35:36,467 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 22:35:36,467 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 22:35:36,476 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:35:36" (1/1) ... [2021-11-12 22:35:36,522 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:35:36" (1/1) ... [2021-11-12 22:35:36,564 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 22:35:36,565 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 22:35:36,565 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 22:35:36,566 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 22:35:36,576 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:35:36" (1/1) ... [2021-11-12 22:35:36,576 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:35:36" (1/1) ... [2021-11-12 22:35:36,592 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:35:36" (1/1) ... [2021-11-12 22:35:36,594 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:35:36" (1/1) ... [2021-11-12 22:35:36,609 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:35:36" (1/1) ... [2021-11-12 22:35:36,624 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:35:36" (1/1) ... [2021-11-12 22:35:36,627 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:35:36" (1/1) ... [2021-11-12 22:35:36,638 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 22:35:36,639 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 22:35:36,647 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 22:35:36,647 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 22:35:36,648 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:35:36" (1/1) ... [2021-11-12 22:35:36,657 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:35:36,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:35:36,684 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 22:35:36,687 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 22:35:36,739 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-12 22:35:36,739 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 22:35:36,739 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-12 22:35:36,739 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-12 22:35:36,740 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 22:35:36,740 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 22:35:37,405 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 22:35:37,405 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-12 22:35:37,407 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:35:37 BoogieIcfgContainer [2021-11-12 22:35:37,408 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 22:35:37,410 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 22:35:37,413 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 22:35:37,417 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 22:35:37,446 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 10:35:35" (1/3) ... [2021-11-12 22:35:37,447 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f08346 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:35:37, skipping insertion in model container [2021-11-12 22:35:37,447 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:35:36" (2/3) ... [2021-11-12 22:35:37,448 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f08346 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:35:37, skipping insertion in model container [2021-11-12 22:35:37,448 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:35:37" (3/3) ... [2021-11-12 22:35:37,450 INFO L111 eAbstractionObserver]: Analyzing ICFG diff-alloca-2.i [2021-11-12 22:35:37,456 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 22:35:37,456 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 13 error locations. [2021-11-12 22:35:37,513 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 22:35:37,531 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 [2021-11-12 22:35:37,532 INFO L340 AbstractCegarLoop]: Starting to check reachability of 13 error locations. [2021-11-12 22:35:37,564 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) [2021-11-12 22:35:37,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-12 22:35:37,573 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:35:37,577 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:35:37,577 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:35:37,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:35:37,583 INFO L85 PathProgramCache]: Analyzing trace with hash 1805029096, now seen corresponding path program 1 times [2021-11-12 22:35:37,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:35:37,595 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1488808568] [2021-11-12 22:35:37,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:37,597 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:35:37,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:35:37,602 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:35:37,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-12 22:35:37,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:37,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:35:37,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:38,047 INFO L354 Elim1Store]: treesize reduction 39, result has 29.1 percent of original size [2021-11-12 22:35:38,048 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 [2021-11-12 22:35:38,231 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:38,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:38,343 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:38,344 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:35:38,344 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1488808568] [2021-11-12 22:35:38,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1488808568] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:35:38,345 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:35:38,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 3 [2021-11-12 22:35:38,349 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194843204] [2021-11-12 22:35:38,350 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:35:38,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:35:38,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:35:38,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:35:38,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:35:38,410 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) [2021-11-12 22:35:38,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:35:38,542 INFO L93 Difference]: Finished difference Result 49 states and 60 transitions. [2021-11-12 22:35:38,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:35:38,547 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 [2021-11-12 22:35:38,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:35:38,558 INFO L225 Difference]: With dead ends: 49 [2021-11-12 22:35:38,558 INFO L226 Difference]: Without dead ends: 47 [2021-11-12 22:35:38,560 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:35:38,565 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 10 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 77.83ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.33ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 5 IncrementalHoareTripleChecker+Unchecked, 93.24ms IncrementalHoareTripleChecker+Time [2021-11-12 22:35:38,567 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 73 Invalid, 19 Unknown, 0 Unchecked, 7.33ms Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 5 Unchecked, 93.24ms Time] [2021-11-12 22:35:38,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-12 22:35:38,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 42. [2021-11-12 22:35:38,611 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) [2021-11-12 22:35:38,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 51 transitions. [2021-11-12 22:35:38,615 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 51 transitions. Word has length 7 [2021-11-12 22:35:38,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:35:38,616 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 51 transitions. [2021-11-12 22:35:38,617 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) [2021-11-12 22:35:38,617 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 51 transitions. [2021-11-12 22:35:38,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-12 22:35:38,618 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:35:38,618 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:35:38,645 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-12 22:35:38,845 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:35:38,845 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:35:38,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:35:38,850 INFO L85 PathProgramCache]: Analyzing trace with hash 1805029097, now seen corresponding path program 1 times [2021-11-12 22:35:38,854 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:35:38,854 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1689853737] [2021-11-12 22:35:38,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:38,855 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:35:38,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:35:38,856 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:35:38,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-12 22:35:38,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:38,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-12 22:35:38,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:39,094 INFO L354 Elim1Store]: treesize reduction 42, result has 28.8 percent of original size [2021-11-12 22:35:39,095 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 [2021-11-12 22:35:39,106 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 [2021-11-12 22:35:39,664 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:39,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:39,843 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 60 treesize of output 58 [2021-11-12 22:35:39,901 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:39,902 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:35:39,902 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1689853737] [2021-11-12 22:35:39,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1689853737] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:35:39,902 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:35:39,903 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-11-12 22:35:39,903 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057471306] [2021-11-12 22:35:39,903 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:35:39,904 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:35:39,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:35:39,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:35:39,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-12 22:35:39,906 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) [2021-11-12 22:35:40,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:35:40,485 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2021-11-12 22:35:40,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-12 22:35:40,487 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 [2021-11-12 22:35:40,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:35:40,488 INFO L225 Difference]: With dead ends: 46 [2021-11-12 22:35:40,488 INFO L226 Difference]: Without dead ends: 46 [2021-11-12 22:35:40,489 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 [2021-11-12 22:35:40,490 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 6 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 282.81ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.05ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 4 IncrementalHoareTripleChecker+Unchecked, 303.63ms IncrementalHoareTripleChecker+Time [2021-11-12 22:35:40,491 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 110 Invalid, 25 Unknown, 0 Unchecked, 2.05ms Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 4 Unchecked, 303.63ms Time] [2021-11-12 22:35:40,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-12 22:35:40,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2021-11-12 22:35:40,497 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) [2021-11-12 22:35:40,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2021-11-12 22:35:40,499 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 7 [2021-11-12 22:35:40,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:35:40,499 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2021-11-12 22:35:40,499 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) [2021-11-12 22:35:40,500 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2021-11-12 22:35:40,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-12 22:35:40,500 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:35:40,501 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:35:40,513 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-11-12 22:35:40,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:35:40,714 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:35:40,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:35:40,715 INFO L85 PathProgramCache]: Analyzing trace with hash -533876908, now seen corresponding path program 1 times [2021-11-12 22:35:40,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:35:40,716 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1501934232] [2021-11-12 22:35:40,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:40,716 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:35:40,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:35:40,718 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:35:40,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-12 22:35:40,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:40,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 22:35:40,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:40,830 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:40,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:40,878 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:40,878 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:35:40,879 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1501934232] [2021-11-12 22:35:40,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1501934232] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:35:40,879 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:35:40,879 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-12 22:35:40,880 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263960571] [2021-11-12 22:35:40,880 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:35:40,881 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:35:40,881 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:35:40,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:35:40,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-12 22:35:40,883 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) [2021-11-12 22:35:41,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:35:41,017 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2021-11-12 22:35:41,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 22:35:41,019 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 [2021-11-12 22:35:41,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:35:41,022 INFO L225 Difference]: With dead ends: 83 [2021-11-12 22:35:41,024 INFO L226 Difference]: Without dead ends: 83 [2021-11-12 22:35:41,025 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 [2021-11-12 22:35:41,027 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 138 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 73.55ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.32ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 90.33ms IncrementalHoareTripleChecker+Time [2021-11-12 22:35:41,029 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 115 Invalid, 35 Unknown, 0 Unchecked, 4.32ms Time], IncrementalHoareTripleChecker [7 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 90.33ms Time] [2021-11-12 22:35:41,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-12 22:35:41,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 42. [2021-11-12 22:35:41,040 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) [2021-11-12 22:35:41,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2021-11-12 22:35:41,043 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 9 [2021-11-12 22:35:41,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:35:41,043 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2021-11-12 22:35:41,044 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) [2021-11-12 22:35:41,045 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2021-11-12 22:35:41,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-12 22:35:41,047 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:35:41,048 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:35:41,069 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-12 22:35:41,261 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:35:41,261 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:35:41,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:35:41,262 INFO L85 PathProgramCache]: Analyzing trace with hash -1906083541, now seen corresponding path program 1 times [2021-11-12 22:35:41,262 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:35:41,263 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1233690972] [2021-11-12 22:35:41,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:41,263 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:35:41,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:35:41,264 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:35:41,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-12 22:35:41,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:41,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:35:41,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:41,423 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:41,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:41,494 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:41,494 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:35:41,494 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1233690972] [2021-11-12 22:35:41,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1233690972] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:35:41,495 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1663172000] [2021-11-12 22:35:41,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:41,495 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:35:41,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:35:41,498 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:35:41,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (6)] Waiting until timeout for monitored process [2021-11-12 22:35:41,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:41,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:35:41,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:41,619 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:41,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:41,650 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:41,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1663172000] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:35:41,651 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:35:41,651 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5] total 9 [2021-11-12 22:35:41,652 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076483486] [2021-11-12 22:35:41,652 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:35:41,653 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:35:41,653 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:35:41,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:35:41,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-12 22:35:41,655 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) [2021-11-12 22:35:41,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:35:41,762 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2021-11-12 22:35:41,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:35:41,764 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 [2021-11-12 22:35:41,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:35:41,764 INFO L225 Difference]: With dead ends: 41 [2021-11-12 22:35:41,764 INFO L226 Difference]: Without dead ends: 41 [2021-11-12 22:35:41,765 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 [2021-11-12 22:35:41,766 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 33 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 87.04ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.07ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 100.90ms IncrementalHoareTripleChecker+Time [2021-11-12 22:35:41,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 36 Invalid, 19 Unknown, 0 Unchecked, 1.07ms Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 100.90ms Time] [2021-11-12 22:35:41,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-12 22:35:41,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-12 22:35:41,770 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) [2021-11-12 22:35:41,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2021-11-12 22:35:41,771 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 11 [2021-11-12 22:35:41,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:35:41,771 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2021-11-12 22:35:41,771 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) [2021-11-12 22:35:41,771 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2021-11-12 22:35:41,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-12 22:35:41,772 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:35:41,772 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:35:41,789 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (6)] Forceful destruction successful, exit code 0 [2021-11-12 22:35:41,984 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-12 22:35:42,177 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:35:42,178 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:35:42,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:35:42,178 INFO L85 PathProgramCache]: Analyzing trace with hash -1906083540, now seen corresponding path program 1 times [2021-11-12 22:35:42,179 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:35:42,179 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1633353339] [2021-11-12 22:35:42,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:42,179 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:35:42,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:35:42,181 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:35:42,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-12 22:35:42,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:42,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:35:42,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:42,345 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:42,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:42,420 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:42,421 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:35:42,421 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1633353339] [2021-11-12 22:35:42,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1633353339] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:35:42,421 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1708164609] [2021-11-12 22:35:42,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:42,422 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:35:42,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:35:42,425 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:35:42,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (8)] Waiting until timeout for monitored process [2021-11-12 22:35:42,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:42,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:35:42,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:42,616 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:42,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:42,661 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:42,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1708164609] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:35:42,662 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1512652588] [2021-11-12 22:35:42,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:42,662 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:35:42,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:35:42,664 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:35:42,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-12 22:35:42,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:42,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:35:42,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:42,799 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:42,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:42,841 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:42,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1512652588] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:35:42,842 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:35:42,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-12 22:35:42,843 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206329386] [2021-11-12 22:35:42,843 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:35:42,844 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 22:35:42,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:35:42,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 22:35:42,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:35:42,845 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) [2021-11-12 22:35:42,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:35:42,949 INFO L93 Difference]: Finished difference Result 77 states and 89 transitions. [2021-11-12 22:35:42,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 22:35:42,950 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 [2021-11-12 22:35:42,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:35:42,952 INFO L225 Difference]: With dead ends: 77 [2021-11-12 22:35:42,952 INFO L226 Difference]: Without dead ends: 77 [2021-11-12 22:35:42,953 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 [2021-11-12 22:35:42,958 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 72 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 74.83ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.45ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 92.75ms IncrementalHoareTripleChecker+Time [2021-11-12 22:35:42,960 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 226 Invalid, 52 Unknown, 0 Unchecked, 2.45ms Time], IncrementalHoareTripleChecker [3 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 92.75ms Time] [2021-11-12 22:35:42,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-12 22:35:42,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 48. [2021-11-12 22:35:42,970 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) [2021-11-12 22:35:42,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2021-11-12 22:35:42,973 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 11 [2021-11-12 22:35:42,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:35:42,974 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2021-11-12 22:35:42,974 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) [2021-11-12 22:35:42,974 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2021-11-12 22:35:42,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-12 22:35:42,975 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:35:42,975 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:35:42,984 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-12 22:35:43,182 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (8)] Ended with exit code 0 [2021-11-12 22:35:43,402 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-12 22:35:43,582 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:35:43,582 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:35:43,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:35:43,584 INFO L85 PathProgramCache]: Analyzing trace with hash -1226025170, now seen corresponding path program 1 times [2021-11-12 22:35:43,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:35:43,584 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1091684639] [2021-11-12 22:35:43,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:43,585 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:35:43,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:35:43,586 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:35:43,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-12 22:35:43,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:43,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 22:35:43,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:43,766 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-12 22:35:43,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 28 treesize of output 35 [2021-11-12 22:35:43,776 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 [2021-11-12 22:35:45,173 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:45,173 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:45,993 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 [2021-11-12 22:35:46,102 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:46,102 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:35:46,102 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1091684639] [2021-11-12 22:35:46,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1091684639] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:35:46,103 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1638034214] [2021-11-12 22:35:46,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:46,103 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:35:46,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:35:46,105 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:35:46,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-12 22:35:46,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:46,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 22:35:46,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:46,350 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-12 22:35:46,350 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 [2021-11-12 22:35:46,361 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 [2021-11-12 22:35:47,644 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:47,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:47,919 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 [2021-11-12 22:35:47,983 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:47,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1638034214] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:35:47,983 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [362464868] [2021-11-12 22:35:47,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:47,991 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:35:47,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:35:47,992 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:35:48,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-12 22:35:48,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:48,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 22:35:48,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:48,143 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-12 22:35:48,144 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 [2021-11-12 22:35:48,155 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:35:48,156 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 [2021-11-12 22:35:51,946 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:51,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:52,248 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:35:52,249 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 72 treesize of output 68 [2021-11-12 22:35:52,374 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:35:52,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [362464868] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:35:52,374 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:35:52,374 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6, 6, 5, 5] total 16 [2021-11-12 22:35:52,375 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518971900] [2021-11-12 22:35:52,375 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:35:52,375 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-12 22:35:52,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:35:52,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-12 22:35:52,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=192, Unknown=1, NotChecked=0, Total=272 [2021-11-12 22:35:52,377 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand has 17 states, 16 states have (on average 2.3125) internal successors, (37), 17 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:35:52,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:35:52,688 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2021-11-12 22:35:52,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 22:35:52,689 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.3125) internal successors, (37), 17 states have internal predecessors, (37), 0 states have call successors, (0), 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 [2021-11-12 22:35:52,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:35:52,691 INFO L225 Difference]: With dead ends: 56 [2021-11-12 22:35:52,692 INFO L226 Difference]: Without dead ends: 56 [2021-11-12 22:35:52,692 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=111, Invalid=268, Unknown=1, NotChecked=0, Total=380 [2021-11-12 22:35:52,693 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 8 mSDsluCounter, 236 mSDsCounter, 0 mSdLazyCounter, 1 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.82ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 285 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.57ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 10.02ms IncrementalHoareTripleChecker+Time [2021-11-12 22:35:52,694 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 285 Invalid, 48 Unknown, 0 Unchecked, 1.57ms Time], IncrementalHoareTripleChecker [0 Valid, 1 Invalid, 0 Unknown, 47 Unchecked, 10.02ms Time] [2021-11-12 22:35:52,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-12 22:35:52,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-11-12 22:35:52,701 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) [2021-11-12 22:35:52,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 66 transitions. [2021-11-12 22:35:52,702 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 66 transitions. Word has length 11 [2021-11-12 22:35:52,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:35:52,703 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 66 transitions. [2021-11-12 22:35:52,703 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.3125) internal successors, (37), 17 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:35:52,703 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 66 transitions. [2021-11-12 22:35:52,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-12 22:35:52,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:35:52,705 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:35:52,731 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-12 22:35:52,916 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-12 22:35:53,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-12 22:35:53,309 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:35:53,310 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:35:53,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:35:53,310 INFO L85 PathProgramCache]: Analyzing trace with hash -2090265385, now seen corresponding path program 1 times [2021-11-12 22:35:53,310 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:35:53,310 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1749906654] [2021-11-12 22:35:53,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:53,311 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:35:53,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:35:53,312 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:35:53,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-12 22:35:53,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:53,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:35:53,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:53,433 INFO L354 Elim1Store]: treesize reduction 39, result has 29.1 percent of original size [2021-11-12 22:35:53,434 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 29 treesize of output 35 [2021-11-12 22:35:53,865 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:35:53,865 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:53,917 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:35:53,917 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:35:53,917 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1749906654] [2021-11-12 22:35:53,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1749906654] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:35:53,918 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:35:53,918 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 3 [2021-11-12 22:35:53,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035761292] [2021-11-12 22:35:53,918 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:35:53,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:35:53,920 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:35:53,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:35:53,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:35:53,921 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) [2021-11-12 22:35:53,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:35:53,934 INFO L93 Difference]: Finished difference Result 59 states and 71 transitions. [2021-11-12 22:35:53,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:35:53,935 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 [2021-11-12 22:35:53,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:35:53,936 INFO L225 Difference]: With dead ends: 59 [2021-11-12 22:35:53,938 INFO L226 Difference]: Without dead ends: 59 [2021-11-12 22:35:53,939 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 [2021-11-12 22:35:53,940 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 2 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.53ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 17 IncrementalHoareTripleChecker+Unchecked, 0.07ms IncrementalHoareTripleChecker+Time [2021-11-12 22:35:53,945 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 86 Invalid, 17 Unknown, 0 Unchecked, 0.53ms Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 17 Unchecked, 0.07ms Time] [2021-11-12 22:35:53,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-12 22:35:53,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-11-12 22:35:53,956 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) [2021-11-12 22:35:53,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 70 transitions. [2021-11-12 22:35:53,961 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 70 transitions. Word has length 13 [2021-11-12 22:35:53,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:35:53,961 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 70 transitions. [2021-11-12 22:35:53,962 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) [2021-11-12 22:35:53,962 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 70 transitions. [2021-11-12 22:35:53,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-12 22:35:53,963 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:35:53,964 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:35:53,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-12 22:35:54,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:35:54,177 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:35:54,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:35:54,178 INFO L85 PathProgramCache]: Analyzing trace with hash -2090265384, now seen corresponding path program 1 times [2021-11-12 22:35:54,178 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:35:54,179 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1772941317] [2021-11-12 22:35:54,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:54,179 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:35:54,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:35:54,180 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:35:54,218 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-12 22:35:54,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:54,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-12 22:35:54,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:54,326 INFO L354 Elim1Store]: treesize reduction 44, result has 27.9 percent of original size [2021-11-12 22:35:54,327 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 [2021-11-12 22:35:54,331 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 [2021-11-12 22:35:58,617 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:35:58,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:58,895 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 [2021-11-12 22:35:58,929 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:35:58,929 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:35:58,930 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1772941317] [2021-11-12 22:35:58,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1772941317] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:35:58,930 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:35:58,930 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2021-11-12 22:35:58,930 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126198490] [2021-11-12 22:35:58,930 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:35:58,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 22:35:58,931 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:35:58,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 22:35:58,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:35:58,931 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) [2021-11-12 22:35:59,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:35:59,349 INFO L93 Difference]: Finished difference Result 82 states and 98 transitions. [2021-11-12 22:35:59,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-12 22:35:59,350 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 [2021-11-12 22:35:59,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:35:59,351 INFO L225 Difference]: With dead ends: 82 [2021-11-12 22:35:59,351 INFO L226 Difference]: Without dead ends: 82 [2021-11-12 22:35:59,352 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-11-12 22:35:59,353 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 6 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 231.48ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.32ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 250.74ms IncrementalHoareTripleChecker+Time [2021-11-12 22:35:59,353 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 190 Invalid, 52 Unknown, 0 Unchecked, 1.32ms Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 18 Unchecked, 250.74ms Time] [2021-11-12 22:35:59,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-12 22:35:59,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 58. [2021-11-12 22:35:59,359 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) [2021-11-12 22:35:59,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 69 transitions. [2021-11-12 22:35:59,360 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 69 transitions. Word has length 13 [2021-11-12 22:35:59,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:35:59,360 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 69 transitions. [2021-11-12 22:35:59,361 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) [2021-11-12 22:35:59,361 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 69 transitions. [2021-11-12 22:35:59,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-12 22:35:59,362 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:35:59,362 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:35:59,371 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-12 22:35:59,565 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:35:59,565 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)] === [2021-11-12 22:35:59,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:35:59,566 INFO L85 PathProgramCache]: Analyzing trace with hash 1633190459, now seen corresponding path program 1 times [2021-11-12 22:35:59,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:35:59,566 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [406682599] [2021-11-12 22:35:59,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:35:59,566 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:35:59,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:35:59,567 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:35:59,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-12 22:35:59,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:35:59,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 22:35:59,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:35:59,667 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:35:59,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:35:59,714 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:35:59,714 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:35:59,714 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [406682599] [2021-11-12 22:35:59,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [406682599] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:35:59,714 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:35:59,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-12 22:35:59,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486034056] [2021-11-12 22:35:59,715 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:35:59,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:35:59,715 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:35:59,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:35:59,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-12 22:35:59,716 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) [2021-11-12 22:35:59,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:35:59,818 INFO L93 Difference]: Finished difference Result 113 states and 130 transitions. [2021-11-12 22:35:59,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 22:35:59,819 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 [2021-11-12 22:35:59,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:35:59,820 INFO L225 Difference]: With dead ends: 113 [2021-11-12 22:35:59,820 INFO L226 Difference]: Without dead ends: 113 [2021-11-12 22:35:59,821 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 [2021-11-12 22:35:59,821 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 117 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 68.76ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.19ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 77.47ms IncrementalHoareTripleChecker+Time [2021-11-12 22:35:59,822 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 110 Invalid, 33 Unknown, 0 Unchecked, 1.19ms Time], IncrementalHoareTripleChecker [7 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 77.47ms Time] [2021-11-12 22:35:59,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-12 22:35:59,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 58. [2021-11-12 22:35:59,828 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) [2021-11-12 22:35:59,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2021-11-12 22:35:59,829 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 16 [2021-11-12 22:35:59,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:35:59,829 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2021-11-12 22:35:59,829 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) [2021-11-12 22:35:59,829 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2021-11-12 22:35:59,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-12 22:35:59,830 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:35:59,831 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:35:59,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:00,048 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:36:00,048 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:36:00,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:36:00,049 INFO L85 PathProgramCache]: Analyzing trace with hash -862198758, now seen corresponding path program 1 times [2021-11-12 22:36:00,049 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:36:00,049 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [681918373] [2021-11-12 22:36:00,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:00,049 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:36:00,049 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:36:00,062 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:36:00,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-12 22:36:00,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:00,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:36:00,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:00,229 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:00,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:00,320 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:00,320 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:36:00,320 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [681918373] [2021-11-12 22:36:00,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [681918373] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:00,320 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [165261154] [2021-11-12 22:36:00,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:00,321 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:36:00,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:36:00,322 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:36:00,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-12 22:36:00,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:00,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:36:00,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:00,463 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:00,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:00,518 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:00,518 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [165261154] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:36:00,518 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:36:00,519 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5] total 9 [2021-11-12 22:36:00,519 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490047396] [2021-11-12 22:36:00,519 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:36:00,520 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:36:00,520 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:36:00,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:36:00,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-12 22:36:00,521 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) [2021-11-12 22:36:00,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:36:00,611 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-11-12 22:36:00,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:36:00,611 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 [2021-11-12 22:36:00,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:36:00,612 INFO L225 Difference]: With dead ends: 57 [2021-11-12 22:36:00,612 INFO L226 Difference]: Without dead ends: 57 [2021-11-12 22:36:00,613 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 [2021-11-12 22:36:00,613 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 32 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 77.39ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.63ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 87.20ms IncrementalHoareTripleChecker+Time [2021-11-12 22:36:00,614 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 36 Invalid, 18 Unknown, 0 Unchecked, 0.63ms Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 87.20ms Time] [2021-11-12 22:36:00,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-12 22:36:00,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-11-12 22:36:00,618 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) [2021-11-12 22:36:00,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-11-12 22:36:00,620 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 17 [2021-11-12 22:36:00,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:36:00,620 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-11-12 22:36:00,620 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) [2021-11-12 22:36:00,621 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-11-12 22:36:00,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-12 22:36:00,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:36:00,622 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:36:00,632 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:00,830 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:01,029 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:36:01,030 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:36:01,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:36:01,030 INFO L85 PathProgramCache]: Analyzing trace with hash -862198757, now seen corresponding path program 1 times [2021-11-12 22:36:01,031 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:36:01,031 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1694780959] [2021-11-12 22:36:01,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:01,031 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:36:01,032 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:36:01,032 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:36:01,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-12 22:36:01,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:01,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:36:01,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:01,193 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:01,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:01,277 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:01,278 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:36:01,278 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1694780959] [2021-11-12 22:36:01,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1694780959] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:01,278 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [75590884] [2021-11-12 22:36:01,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:01,278 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:36:01,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:36:01,279 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:36:01,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-12 22:36:01,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:01,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:36:01,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:01,475 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:01,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:01,527 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:01,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [75590884] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:01,528 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1366861441] [2021-11-12 22:36:01,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:01,528 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:36:01,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:36:01,529 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:36:01,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-12 22:36:01,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:01,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:36:01,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:01,669 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:01,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:01,724 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:01,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1366861441] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:01,725 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:36:01,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-12 22:36:01,732 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625953353] [2021-11-12 22:36:01,732 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:36:01,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 22:36:01,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:36:01,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 22:36:01,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:36:01,735 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) [2021-11-12 22:36:01,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:36:01,872 INFO L93 Difference]: Finished difference Result 107 states and 123 transitions. [2021-11-12 22:36:01,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 22:36:01,873 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 [2021-11-12 22:36:01,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:36:01,875 INFO L225 Difference]: With dead ends: 107 [2021-11-12 22:36:01,875 INFO L226 Difference]: Without dead ends: 107 [2021-11-12 22:36:01,875 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 [2021-11-12 22:36:01,876 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 87 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 111.39ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.96ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 128.12ms IncrementalHoareTripleChecker+Time [2021-11-12 22:36:01,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 162 Invalid, 52 Unknown, 0 Unchecked, 1.96ms Time], IncrementalHoareTripleChecker [4 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 128.12ms Time] [2021-11-12 22:36:01,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-12 22:36:01,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 84. [2021-11-12 22:36:01,890 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) [2021-11-12 22:36:01,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 98 transitions. [2021-11-12 22:36:01,899 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 98 transitions. Word has length 17 [2021-11-12 22:36:01,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:36:01,900 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 98 transitions. [2021-11-12 22:36:01,900 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) [2021-11-12 22:36:01,900 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 98 transitions. [2021-11-12 22:36:01,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-12 22:36:01,903 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:36:01,903 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:36:01,914 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:02,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:02,340 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:02,516 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:36:02,516 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:36:02,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:36:02,517 INFO L85 PathProgramCache]: Analyzing trace with hash -1873316007, now seen corresponding path program 1 times [2021-11-12 22:36:02,517 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:36:02,517 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1677267128] [2021-11-12 22:36:02,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:02,517 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:36:02,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:36:02,518 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:36:02,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-12 22:36:02,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:02,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 22:36:02,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:02,676 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-12 22:36:02,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 33 treesize of output 40 [2021-11-12 22:36:02,682 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 42 treesize of output 40 [2021-11-12 22:36:07,560 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:07,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:08,228 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 32 [2021-11-12 22:36:08,304 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:08,304 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:36:08,305 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1677267128] [2021-11-12 22:36:08,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1677267128] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:08,305 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1874789475] [2021-11-12 22:36:08,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:08,305 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:36:08,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:36:08,307 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:36:08,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-12 22:36:08,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:08,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 22:36:08,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:08,549 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-12 22:36:08,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 33 treesize of output 40 [2021-11-12 22:36:08,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 40 [2021-11-12 22:36:11,259 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:11,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:11,648 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 [2021-11-12 22:36:11,664 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:11,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1874789475] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:11,665 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [532550053] [2021-11-12 22:36:11,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:11,665 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:36:11,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:36:11,674 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:36:11,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-12 22:36:11,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:11,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 22:36:11,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:11,797 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-12 22:36:11,798 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 [2021-11-12 22:36:11,811 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 41 treesize of output 39 [2021-11-12 22:36:12,192 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:12,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:12,531 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 [2021-11-12 22:36:12,549 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:12,549 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [532550053] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:12,549 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:36:12,549 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 15 [2021-11-12 22:36:12,550 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298211444] [2021-11-12 22:36:12,550 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:36:12,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-12 22:36:12,550 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:36:12,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-12 22:36:12,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=165, Unknown=0, NotChecked=0, Total=240 [2021-11-12 22:36:12,551 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) [2021-11-12 22:36:13,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:36:13,336 INFO L93 Difference]: Finished difference Result 92 states and 108 transitions. [2021-11-12 22:36:13,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-12 22:36:13,337 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 [2021-11-12 22:36:13,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:36:13,339 INFO L225 Difference]: With dead ends: 92 [2021-11-12 22:36:13,339 INFO L226 Difference]: Without dead ends: 92 [2021-11-12 22:36:13,339 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=91, Invalid=215, Unknown=0, NotChecked=0, Total=306 [2021-11-12 22:36:13,340 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 15 mSDsluCounter, 159 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 474.34ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.54ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 512.00ms IncrementalHoareTripleChecker+Time [2021-11-12 22:36:13,340 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 197 Invalid, 78 Unknown, 0 Unchecked, 1.54ms Time], IncrementalHoareTripleChecker [5 Valid, 57 Invalid, 0 Unknown, 16 Unchecked, 512.00ms Time] [2021-11-12 22:36:13,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-12 22:36:13,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-11-12 22:36:13,345 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) [2021-11-12 22:36:13,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 108 transitions. [2021-11-12 22:36:13,346 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 108 transitions. Word has length 17 [2021-11-12 22:36:13,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:36:13,346 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 108 transitions. [2021-11-12 22:36:13,347 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) [2021-11-12 22:36:13,347 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 108 transitions. [2021-11-12 22:36:13,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-12 22:36:13,348 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:36:13,348 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1] [2021-11-12 22:36:13,376 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2021-11-12 22:36:13,562 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:13,768 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:13,961 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:36:13,962 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:36:13,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:36:13,962 INFO L85 PathProgramCache]: Analyzing trace with hash -472171212, now seen corresponding path program 2 times [2021-11-12 22:36:13,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:36:13,962 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [447225848] [2021-11-12 22:36:13,962 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:36:13,962 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:36:13,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:36:13,963 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:36:13,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-12 22:36:14,017 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:36:14,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:36:14,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-12 22:36:14,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:14,091 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-12 22:36:14,091 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 [2021-11-12 22:36:14,099 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:36:14,100 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 [2021-11-12 22:36:15,896 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:36:15,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:17,058 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:36:17,059 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 [2021-11-12 22:36:17,177 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:36:17,177 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:36:17,177 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [447225848] [2021-11-12 22:36:17,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [447225848] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:17,178 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1940236022] [2021-11-12 22:36:17,178 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:36:17,178 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:36:17,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:36:17,187 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:36:17,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-12 22:36:17,335 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:36:17,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:36:17,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-12 22:36:17,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:17,479 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-12 22:36:17,479 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 [2021-11-12 22:36:17,487 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:36:17,488 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 [2021-11-12 22:36:19,337 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:36:19,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:19,766 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:36:19,766 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 [2021-11-12 22:36:19,787 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:36:19,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1940236022] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:19,787 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1116080350] [2021-11-12 22:36:19,787 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:36:19,794 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:36:19,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:36:19,795 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:36:19,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-12 22:36:19,858 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:36:19,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:36:19,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-12 22:36:19,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:19,941 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-12 22:36:19,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 43 [2021-11-12 22:36:19,956 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:36:19,956 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 [2021-11-12 22:36:21,634 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:36:21,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:22,916 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:36:22,917 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 [2021-11-12 22:36:23,059 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:36:23,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1116080350] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:23,060 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:36:23,060 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 8, 8] total 24 [2021-11-12 22:36:23,060 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780453512] [2021-11-12 22:36:23,060 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:36:23,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-12 22:36:23,061 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:36:23,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-12 22:36:23,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=425, Unknown=0, NotChecked=0, Total=600 [2021-11-12 22:36:23,062 INFO L87 Difference]: Start difference. First operand 92 states and 108 transitions. Second operand has 25 states, 24 states have (on average 2.875) internal successors, (69), 25 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) [2021-11-12 22:36:25,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:36:25,572 INFO L93 Difference]: Finished difference Result 124 states and 148 transitions. [2021-11-12 22:36:25,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-12 22:36:25,573 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.875) internal successors, (69), 25 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 19 [2021-11-12 22:36:25,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:36:25,574 INFO L225 Difference]: With dead ends: 124 [2021-11-12 22:36:25,574 INFO L226 Difference]: Without dead ends: 124 [2021-11-12 22:36:25,575 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=306, Invalid=750, Unknown=0, NotChecked=0, Total=1056 [2021-11-12 22:36:25,576 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 20 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 605.13ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 291 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.64ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 652.58ms IncrementalHoareTripleChecker+Time [2021-11-12 22:36:25,576 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 291 Invalid, 101 Unknown, 0 Unchecked, 1.64ms Time], IncrementalHoareTripleChecker [3 Valid, 82 Invalid, 0 Unknown, 16 Unchecked, 652.58ms Time] [2021-11-12 22:36:25,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-12 22:36:25,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2021-11-12 22:36:25,582 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) [2021-11-12 22:36:25,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 148 transitions. [2021-11-12 22:36:25,583 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 148 transitions. Word has length 19 [2021-11-12 22:36:25,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:36:25,584 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 148 transitions. [2021-11-12 22:36:25,584 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.875) internal successors, (69), 25 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) [2021-11-12 22:36:25,584 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 148 transitions. [2021-11-12 22:36:25,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-12 22:36:25,586 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:36:25,586 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] [2021-11-12 22:36:25,602 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:25,799 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (24)] Ended with exit code 0 [2021-11-12 22:36:26,013 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2021-11-12 22:36:26,188 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:36:26,189 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)] === [2021-11-12 22:36:26,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:36:26,189 INFO L85 PathProgramCache]: Analyzing trace with hash -1860319208, now seen corresponding path program 1 times [2021-11-12 22:36:26,189 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:36:26,189 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1715920102] [2021-11-12 22:36:26,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:26,190 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:36:26,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:36:26,190 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:36:26,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-12 22:36:26,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:26,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 22:36:26,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:26,307 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:36:26,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:26,369 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:36:26,369 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:36:26,369 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1715920102] [2021-11-12 22:36:26,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1715920102] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:36:26,369 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:36:26,369 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-12 22:36:26,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258899272] [2021-11-12 22:36:26,370 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:36:26,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:36:26,370 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:36:26,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:36:26,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-12 22:36:26,371 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) [2021-11-12 22:36:26,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:36:26,517 INFO L93 Difference]: Finished difference Result 187 states and 220 transitions. [2021-11-12 22:36:26,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 22:36:26,518 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 [2021-11-12 22:36:26,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:36:26,519 INFO L225 Difference]: With dead ends: 187 [2021-11-12 22:36:26,519 INFO L226 Difference]: Without dead ends: 187 [2021-11-12 22:36:26,520 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 [2021-11-12 22:36:26,520 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 114 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 98.79ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.14ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 114.39ms IncrementalHoareTripleChecker+Time [2021-11-12 22:36:26,520 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 136 Invalid, 50 Unknown, 0 Unchecked, 1.14ms Time], IncrementalHoareTripleChecker [6 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 114.39ms Time] [2021-11-12 22:36:26,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-11-12 22:36:26,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 125. [2021-11-12 22:36:26,526 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) [2021-11-12 22:36:26,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 149 transitions. [2021-11-12 22:36:26,527 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 149 transitions. Word has length 20 [2021-11-12 22:36:26,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:36:26,527 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 149 transitions. [2021-11-12 22:36:26,528 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) [2021-11-12 22:36:26,528 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 149 transitions. [2021-11-12 22:36:26,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-12 22:36:26,529 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:36:26,529 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] [2021-11-12 22:36:26,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:26,737 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:36:26,737 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:36:26,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:36:26,738 INFO L85 PathProgramCache]: Analyzing trace with hash -1860318342, now seen corresponding path program 1 times [2021-11-12 22:36:26,738 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:36:26,738 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1083013812] [2021-11-12 22:36:26,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:26,738 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:36:26,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:36:26,739 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:36:26,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-12 22:36:26,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:26,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:36:26,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:26,872 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:26,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:26,930 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:26,930 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:36:26,930 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1083013812] [2021-11-12 22:36:26,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1083013812] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:36:26,930 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:36:26,930 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-12 22:36:26,931 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219221473] [2021-11-12 22:36:26,931 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:36:26,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:36:26,931 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:36:26,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:36:26,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:36:26,932 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) [2021-11-12 22:36:27,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:36:27,062 INFO L93 Difference]: Finished difference Result 123 states and 147 transitions. [2021-11-12 22:36:27,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:36:27,063 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 [2021-11-12 22:36:27,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:36:27,064 INFO L225 Difference]: With dead ends: 123 [2021-11-12 22:36:27,064 INFO L226 Difference]: Without dead ends: 123 [2021-11-12 22:36:27,064 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 [2021-11-12 22:36:27,065 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 42 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 108.92ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.64ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 119.78ms IncrementalHoareTripleChecker+Time [2021-11-12 22:36:27,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 48 Invalid, 27 Unknown, 0 Unchecked, 0.64ms Time], IncrementalHoareTripleChecker [2 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 119.78ms Time] [2021-11-12 22:36:27,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-12 22:36:27,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2021-11-12 22:36:27,070 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) [2021-11-12 22:36:27,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 147 transitions. [2021-11-12 22:36:27,071 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 147 transitions. Word has length 20 [2021-11-12 22:36:27,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:36:27,072 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 147 transitions. [2021-11-12 22:36:27,072 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) [2021-11-12 22:36:27,072 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 147 transitions. [2021-11-12 22:36:27,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-12 22:36:27,073 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:36:27,074 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] [2021-11-12 22:36:27,090 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:27,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:36:27,286 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:36:27,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:36:27,287 INFO L85 PathProgramCache]: Analyzing trace with hash -1860318341, now seen corresponding path program 1 times [2021-11-12 22:36:27,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:36:27,287 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [722631977] [2021-11-12 22:36:27,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:27,288 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:36:27,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:36:27,289 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:36:27,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-12 22:36:27,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:27,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 22:36:27,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:27,598 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:27,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:27,979 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 [2021-11-12 22:36:28,074 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:28,074 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:36:28,076 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [722631977] [2021-11-12 22:36:28,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [722631977] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:28,076 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [568340405] [2021-11-12 22:36:28,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:28,076 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:36:28,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:36:28,077 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:36:28,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-12 22:36:28,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:28,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 22:36:28,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:28,329 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:28,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:28,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-12 22:36:28,649 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:28,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [568340405] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:28,650 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [778741539] [2021-11-12 22:36:28,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:28,650 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:36:28,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:36:28,658 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:36:28,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-12 22:36:28,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:28,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 22:36:28,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:28,827 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:28,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:29,047 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 [2021-11-12 22:36:29,086 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:29,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [778741539] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:29,086 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:36:29,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 7 [2021-11-12 22:36:29,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856803613] [2021-11-12 22:36:29,086 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:36:29,087 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 22:36:29,087 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:36:29,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 22:36:29,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:36:29,087 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) [2021-11-12 22:36:29,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:36:29,951 INFO L93 Difference]: Finished difference Result 202 states and 242 transitions. [2021-11-12 22:36:29,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-12 22:36:29,952 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 [2021-11-12 22:36:29,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:36:29,954 INFO L225 Difference]: With dead ends: 202 [2021-11-12 22:36:29,954 INFO L226 Difference]: Without dead ends: 202 [2021-11-12 22:36:29,954 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2021-11-12 22:36:29,955 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 272 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 438.58ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.73ms SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 485.66ms IncrementalHoareTripleChecker+Time [2021-11-12 22:36:29,955 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [272 Valid, 120 Invalid, 113 Unknown, 0 Unchecked, 5.73ms Time], IncrementalHoareTripleChecker [15 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 485.66ms Time] [2021-11-12 22:36:29,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-11-12 22:36:29,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 127. [2021-11-12 22:36:29,960 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) [2021-11-12 22:36:29,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 153 transitions. [2021-11-12 22:36:29,961 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 153 transitions. Word has length 20 [2021-11-12 22:36:29,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:36:29,962 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 153 transitions. [2021-11-12 22:36:29,962 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) [2021-11-12 22:36:29,962 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 153 transitions. [2021-11-12 22:36:29,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-12 22:36:29,963 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:36:29,963 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] [2021-11-12 22:36:29,988 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2021-11-12 22:36:30,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:30,371 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:30,569 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:36:30,570 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:36:30,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:36:30,570 INFO L85 PathProgramCache]: Analyzing trace with hash -1835293711, now seen corresponding path program 1 times [2021-11-12 22:36:30,570 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:36:30,570 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1824071604] [2021-11-12 22:36:30,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:30,571 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:36:30,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:36:30,572 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:36:30,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-12 22:36:30,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:30,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 22:36:30,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:30,705 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:30,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:30,746 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:30,746 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:36:30,746 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1824071604] [2021-11-12 22:36:30,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1824071604] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:36:30,746 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:36:30,747 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-12 22:36:30,747 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876980609] [2021-11-12 22:36:30,747 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:36:30,747 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:36:30,747 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:36:30,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:36:30,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:36:30,748 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) [2021-11-12 22:36:30,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:36:30,839 INFO L93 Difference]: Finished difference Result 126 states and 152 transitions. [2021-11-12 22:36:30,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:36:30,839 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 [2021-11-12 22:36:30,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:36:30,840 INFO L225 Difference]: With dead ends: 126 [2021-11-12 22:36:30,840 INFO L226 Difference]: Without dead ends: 126 [2021-11-12 22:36:30,841 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 [2021-11-12 22:36:30,842 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 45 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 73.37ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.44ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 82.17ms IncrementalHoareTripleChecker+Time [2021-11-12 22:36:30,842 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 49 Invalid, 24 Unknown, 0 Unchecked, 0.44ms Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 82.17ms Time] [2021-11-12 22:36:30,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-12 22:36:30,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2021-11-12 22:36:30,846 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) [2021-11-12 22:36:30,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 152 transitions. [2021-11-12 22:36:30,847 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 152 transitions. Word has length 21 [2021-11-12 22:36:30,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:36:30,848 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 152 transitions. [2021-11-12 22:36:30,848 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) [2021-11-12 22:36:30,848 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 152 transitions. [2021-11-12 22:36:30,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-12 22:36:30,849 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:36:30,849 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] [2021-11-12 22:36:30,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:31,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:36:31,062 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:36:31,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:36:31,062 INFO L85 PathProgramCache]: Analyzing trace with hash -1835293710, now seen corresponding path program 1 times [2021-11-12 22:36:31,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:36:31,063 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1078135310] [2021-11-12 22:36:31,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:31,063 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:36:31,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:36:31,064 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:36:31,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-12 22:36:31,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:31,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 22:36:31,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:31,267 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:31,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:31,585 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 [2021-11-12 22:36:31,726 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:31,726 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:36:31,726 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1078135310] [2021-11-12 22:36:31,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1078135310] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:31,726 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [155969956] [2021-11-12 22:36:31,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:31,727 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:36:31,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:36:31,727 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:36:31,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-12 22:36:31,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:31,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 22:36:31,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:31,916 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:31,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:32,023 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 [2021-11-12 22:36:32,096 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:32,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [155969956] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:32,097 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714999814] [2021-11-12 22:36:32,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:32,097 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:36:32,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:36:32,098 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:36:32,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-12 22:36:32,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:32,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 22:36:32,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:32,268 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:32,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:32,427 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 [2021-11-12 22:36:32,502 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:32,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1714999814] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:32,503 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:36:32,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 11 [2021-11-12 22:36:32,503 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295921929] [2021-11-12 22:36:32,503 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:36:32,504 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-12 22:36:32,504 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:36:32,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-12 22:36:32,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:36:32,505 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) [2021-11-12 22:36:33,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:36:33,577 INFO L93 Difference]: Finished difference Result 208 states and 249 transitions. [2021-11-12 22:36:33,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-12 22:36:33,577 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 [2021-11-12 22:36:33,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:36:33,579 INFO L225 Difference]: With dead ends: 208 [2021-11-12 22:36:33,580 INFO L226 Difference]: Without dead ends: 208 [2021-11-12 22:36:33,580 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 [2021-11-12 22:36:33,581 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 225 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 570.95ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.38ms SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 625.73ms IncrementalHoareTripleChecker+Time [2021-11-12 22:36:33,582 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [225 Valid, 174 Invalid, 150 Unknown, 0 Unchecked, 2.38ms Time], IncrementalHoareTripleChecker [16 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 625.73ms Time] [2021-11-12 22:36:33,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-11-12 22:36:33,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 129. [2021-11-12 22:36:33,585 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) [2021-11-12 22:36:33,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 156 transitions. [2021-11-12 22:36:33,586 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 156 transitions. Word has length 21 [2021-11-12 22:36:33,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:36:33,586 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 156 transitions. [2021-11-12 22:36:33,586 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) [2021-11-12 22:36:33,587 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 156 transitions. [2021-11-12 22:36:33,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-12 22:36:33,587 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:36:33,588 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] [2021-11-12 22:36:33,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:33,797 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:34,013 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-11-12 22:36:34,190 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:36:34,190 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:36:34,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:36:34,191 INFO L85 PathProgramCache]: Analyzing trace with hash -1059572912, now seen corresponding path program 1 times [2021-11-12 22:36:34,191 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:36:34,191 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [609010775] [2021-11-12 22:36:34,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:34,192 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:36:34,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:36:34,193 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:36:34,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-12 22:36:34,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:34,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-12 22:36:34,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:34,362 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:36:34,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:34,470 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:36:34,470 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:36:34,471 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [609010775] [2021-11-12 22:36:34,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [609010775] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:36:34,471 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:36:34,471 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2021-11-12 22:36:34,471 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965714651] [2021-11-12 22:36:34,471 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:36:34,471 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 22:36:34,471 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:36:34,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 22:36:34,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:36:34,472 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) [2021-11-12 22:36:34,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:36:34,671 INFO L93 Difference]: Finished difference Result 156 states and 185 transitions. [2021-11-12 22:36:34,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 22:36:34,673 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 [2021-11-12 22:36:34,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:36:34,674 INFO L225 Difference]: With dead ends: 156 [2021-11-12 22:36:34,674 INFO L226 Difference]: Without dead ends: 156 [2021-11-12 22:36:34,674 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 [2021-11-12 22:36:34,675 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 97 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 103.40ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.25ms SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 122.38ms IncrementalHoareTripleChecker+Time [2021-11-12 22:36:34,676 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 168 Invalid, 66 Unknown, 0 Unchecked, 1.25ms Time], IncrementalHoareTripleChecker [9 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 122.38ms Time] [2021-11-12 22:36:34,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-11-12 22:36:34,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 127. [2021-11-12 22:36:34,680 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) [2021-11-12 22:36:34,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 152 transitions. [2021-11-12 22:36:34,681 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 152 transitions. Word has length 22 [2021-11-12 22:36:34,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:36:34,682 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 152 transitions. [2021-11-12 22:36:34,682 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) [2021-11-12 22:36:34,682 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 152 transitions. [2021-11-12 22:36:34,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-12 22:36:34,683 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:36:34,684 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] [2021-11-12 22:36:34,705 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:34,897 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:36:34,897 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:36:34,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:36:34,898 INFO L85 PathProgramCache]: Analyzing trace with hash -747793046, now seen corresponding path program 1 times [2021-11-12 22:36:34,898 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:36:34,898 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [968816552] [2021-11-12 22:36:34,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:34,898 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:36:34,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:36:34,899 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:36:34,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-12 22:36:34,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:34,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-12 22:36:34,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:35,085 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:36:35,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:35,187 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:36:35,187 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:36:35,187 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [968816552] [2021-11-12 22:36:35,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [968816552] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:35,187 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [914479377] [2021-11-12 22:36:35,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:35,188 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:36:35,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:36:35,188 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:36:35,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-12 22:36:35,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:35,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-12 22:36:35,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:35,355 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:36:35,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:35,406 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:36:35,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [914479377] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:35,407 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578755691] [2021-11-12 22:36:35,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:35,407 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:36:35,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:36:35,408 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:36:35,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-12 22:36:35,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:35,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-12 22:36:35,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:35,524 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:36:35,524 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:35,576 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:36:35,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578755691] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:35,576 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:36:35,576 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 10 [2021-11-12 22:36:35,576 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912013051] [2021-11-12 22:36:35,576 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:36:35,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-12 22:36:35,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:36:35,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-12 22:36:35,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-12 22:36:35,577 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) [2021-11-12 22:36:35,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:36:35,676 INFO L93 Difference]: Finished difference Result 161 states and 189 transitions. [2021-11-12 22:36:35,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 22:36:35,676 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 [2021-11-12 22:36:35,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:36:35,677 INFO L225 Difference]: With dead ends: 161 [2021-11-12 22:36:35,678 INFO L226 Difference]: Without dead ends: 161 [2021-11-12 22:36:35,678 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 [2021-11-12 22:36:35,679 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 80 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 63.91ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.73ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 74.06ms IncrementalHoareTripleChecker+Time [2021-11-12 22:36:35,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 253 Invalid, 68 Unknown, 0 Unchecked, 0.73ms Time], IncrementalHoareTripleChecker [4 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 74.06ms Time] [2021-11-12 22:36:35,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-11-12 22:36:35,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 143. [2021-11-12 22:36:35,683 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) [2021-11-12 22:36:35,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 175 transitions. [2021-11-12 22:36:35,684 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 175 transitions. Word has length 25 [2021-11-12 22:36:35,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:36:35,684 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 175 transitions. [2021-11-12 22:36:35,684 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) [2021-11-12 22:36:35,684 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 175 transitions. [2021-11-12 22:36:35,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-12 22:36:35,685 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:36:35,685 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] [2021-11-12 22:36:35,702 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:35,898 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (38)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:36,122 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2021-11-12 22:36:36,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:36:36,297 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:36:36,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:36:36,298 INFO L85 PathProgramCache]: Analyzing trace with hash -528938328, now seen corresponding path program 1 times [2021-11-12 22:36:36,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:36:36,298 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [680803075] [2021-11-12 22:36:36,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:36,299 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:36:36,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:36:36,299 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:36:36,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-12 22:36:36,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:36,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 22:36:36,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:36,621 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:36,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:36,831 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:36,831 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:36:36,831 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [680803075] [2021-11-12 22:36:36,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [680803075] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:36,832 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1549215626] [2021-11-12 22:36:36,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:36,832 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:36:36,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:36:36,833 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:36:36,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-12 22:36:36,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:36,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 22:36:36,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:37,203 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:37,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:37,270 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:37,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1549215626] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:37,271 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [658107891] [2021-11-12 22:36:37,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:37,271 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:36:37,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:36:37,271 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:36:37,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-12 22:36:37,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:37,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-12 22:36:37,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:37,423 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:37,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:37,488 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:37,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [658107891] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:37,488 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:36:37,488 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9, 8, 9, 8] total 22 [2021-11-12 22:36:37,488 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859530707] [2021-11-12 22:36:37,488 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:36:37,489 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-12 22:36:37,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:36:37,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-12 22:36:37,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2021-11-12 22:36:37,489 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) [2021-11-12 22:36:37,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:36:37,845 INFO L93 Difference]: Finished difference Result 183 states and 222 transitions. [2021-11-12 22:36:37,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-12 22:36:37,846 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 [2021-11-12 22:36:37,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:36:37,847 INFO L225 Difference]: With dead ends: 183 [2021-11-12 22:36:37,847 INFO L226 Difference]: Without dead ends: 183 [2021-11-12 22:36:37,847 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=178, Invalid=578, Unknown=0, NotChecked=0, Total=756 [2021-11-12 22:36:37,848 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 227 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 169.90ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.53ms SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 196.71ms IncrementalHoareTripleChecker+Time [2021-11-12 22:36:37,848 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [227 Valid, 376 Invalid, 177 Unknown, 0 Unchecked, 2.53ms Time], IncrementalHoareTripleChecker [18 Valid, 159 Invalid, 0 Unknown, 0 Unchecked, 196.71ms Time] [2021-11-12 22:36:37,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-11-12 22:36:37,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 143. [2021-11-12 22:36:37,853 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) [2021-11-12 22:36:37,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 175 transitions. [2021-11-12 22:36:37,854 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 175 transitions. Word has length 25 [2021-11-12 22:36:37,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:36:37,854 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 175 transitions. [2021-11-12 22:36:37,854 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) [2021-11-12 22:36:37,855 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 175 transitions. [2021-11-12 22:36:37,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-12 22:36:37,855 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:36:37,855 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:36:37,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (41)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:38,066 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (40)] Ended with exit code 0 [2021-11-12 22:36:38,283 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2021-11-12 22:36:38,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:36:38,458 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:36:38,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:36:38,458 INFO L85 PathProgramCache]: Analyzing trace with hash -1117279393, now seen corresponding path program 2 times [2021-11-12 22:36:38,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:36:38,459 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [924408340] [2021-11-12 22:36:38,459 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:36:38,459 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:36:38,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:36:38,460 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:36:38,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-12 22:36:38,519 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:36:38,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:36:38,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-12 22:36:38,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:38,589 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-12 22:36:38,590 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 [2021-11-12 22:36:38,594 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 [2021-11-12 22:36:45,560 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:45,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:47,127 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 [2021-11-12 22:36:47,222 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:47,223 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:36:47,223 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [924408340] [2021-11-12 22:36:47,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [924408340] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:47,223 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [367847249] [2021-11-12 22:36:47,223 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:36:47,224 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:36:47,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:36:47,225 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:36:47,226 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-12 22:36:47,350 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:36:47,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:36:47,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 22:36:47,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:47,414 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-12 22:36:47,414 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 [2021-11-12 22:36:47,418 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 [2021-11-12 22:36:49,074 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:49,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:49,937 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 [2021-11-12 22:36:50,036 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:50,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [367847249] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:50,037 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676015408] [2021-11-12 22:36:50,037 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:36:50,037 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:36:50,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:36:50,038 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:36:50,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-12 22:36:50,100 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:36:50,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:36:50,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 22:36:50,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:50,168 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-12 22:36:50,168 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 [2021-11-12 22:36:50,172 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 [2021-11-12 22:36:50,860 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:50,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:51,420 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 [2021-11-12 22:36:51,433 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:36:51,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1676015408] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:36:51,433 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:36:51,434 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8, 8, 8, 8] total 22 [2021-11-12 22:36:51,434 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538107885] [2021-11-12 22:36:51,434 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:36:51,435 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-12 22:36:51,435 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:36:51,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-12 22:36:51,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=359, Unknown=0, NotChecked=0, Total=506 [2021-11-12 22:36:51,436 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) [2021-11-12 22:36:58,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:36:58,568 INFO L93 Difference]: Finished difference Result 159 states and 195 transitions. [2021-11-12 22:36:58,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-12 22:36:58,569 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 [2021-11-12 22:36:58,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:36:58,571 INFO L225 Difference]: With dead ends: 159 [2021-11-12 22:36:58,571 INFO L226 Difference]: Without dead ends: 159 [2021-11-12 22:36:58,572 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 125 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=299, Invalid=757, Unknown=0, NotChecked=0, Total=1056 [2021-11-12 22:36:58,572 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 34 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 772.94ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.24ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 819.46ms IncrementalHoareTripleChecker+Time [2021-11-12 22:36:58,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 204 Invalid, 103 Unknown, 0 Unchecked, 1.24ms Time], IncrementalHoareTripleChecker [6 Valid, 79 Invalid, 0 Unknown, 18 Unchecked, 819.46ms Time] [2021-11-12 22:36:58,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-11-12 22:36:58,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2021-11-12 22:36:58,577 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) [2021-11-12 22:36:58,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 195 transitions. [2021-11-12 22:36:58,579 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 195 transitions. Word has length 25 [2021-11-12 22:36:58,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:36:58,579 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 195 transitions. [2021-11-12 22:36:58,579 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) [2021-11-12 22:36:58,580 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 195 transitions. [2021-11-12 22:36:58,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-12 22:36:58,580 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:36:58,581 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, 1, 1, 1, 1, 1, 1] [2021-11-12 22:36:58,583 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (44)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:58,806 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2021-11-12 22:36:58,990 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (43)] Ended with exit code 0 [2021-11-12 22:36:59,183 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:36:59,183 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:36:59,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:36:59,183 INFO L85 PathProgramCache]: Analyzing trace with hash -1706790696, now seen corresponding path program 1 times [2021-11-12 22:36:59,184 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:36:59,184 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1744197889] [2021-11-12 22:36:59,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:59,184 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:36:59,184 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:36:59,185 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:36:59,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-12 22:36:59,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:59,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 22:36:59,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:59,288 INFO L354 Elim1Store]: treesize reduction 39, result has 29.1 percent of original size [2021-11-12 22:36:59,288 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 [2021-11-12 22:36:59,353 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:36:59,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:36:59,410 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:36:59,410 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:36:59,410 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1744197889] [2021-11-12 22:36:59,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1744197889] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:36:59,410 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:36:59,410 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-12 22:36:59,410 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232135548] [2021-11-12 22:36:59,411 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:36:59,411 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:36:59,411 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:36:59,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:36:59,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:36:59,411 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) [2021-11-12 22:36:59,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:36:59,482 INFO L93 Difference]: Finished difference Result 158 states and 193 transitions. [2021-11-12 22:36:59,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:36:59,482 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 [2021-11-12 22:36:59,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:36:59,483 INFO L225 Difference]: With dead ends: 158 [2021-11-12 22:36:59,483 INFO L226 Difference]: Without dead ends: 158 [2021-11-12 22:36:59,483 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 [2021-11-12 22:36:59,484 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 29 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 56.33ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.31ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 63.27ms IncrementalHoareTripleChecker+Time [2021-11-12 22:36:59,484 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 50 Invalid, 20 Unknown, 0 Unchecked, 0.31ms Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 63.27ms Time] [2021-11-12 22:36:59,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-11-12 22:36:59,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 158. [2021-11-12 22:36:59,488 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) [2021-11-12 22:36:59,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 193 transitions. [2021-11-12 22:36:59,489 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 193 transitions. Word has length 26 [2021-11-12 22:36:59,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:36:59,490 INFO L470 AbstractCegarLoop]: Abstraction has 158 states and 193 transitions. [2021-11-12 22:36:59,490 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) [2021-11-12 22:36:59,490 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 193 transitions. [2021-11-12 22:36:59,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-12 22:36:59,491 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:36:59,491 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] [2021-11-12 22:36:59,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (46)] Forceful destruction successful, exit code 0 [2021-11-12 22:36:59,702 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:36:59,702 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:36:59,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:36:59,703 INFO L85 PathProgramCache]: Analyzing trace with hash -1706790695, now seen corresponding path program 1 times [2021-11-12 22:36:59,703 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:36:59,703 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [928185847] [2021-11-12 22:36:59,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:36:59,703 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:36:59,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:36:59,704 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:36:59,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-12 22:36:59,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:36:59,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 22:36:59,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:36:59,839 INFO L354 Elim1Store]: treesize reduction 38, result has 35.6 percent of original size [2021-11-12 22:36:59,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 14 treesize of output 26 [2021-11-12 22:37:00,041 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:37:00,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:00,593 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:37:00,593 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:37:00,593 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [928185847] [2021-11-12 22:37:00,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [928185847] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:37:00,594 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:37:00,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2021-11-12 22:37:00,594 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267368435] [2021-11-12 22:37:00,594 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:37:00,594 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 22:37:00,594 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:37:00,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 22:37:00,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:37:00,595 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) [2021-11-12 22:37:01,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:37:01,307 INFO L93 Difference]: Finished difference Result 300 states and 370 transitions. [2021-11-12 22:37:01,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 22:37:01,308 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 [2021-11-12 22:37:01,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:37:01,310 INFO L225 Difference]: With dead ends: 300 [2021-11-12 22:37:01,310 INFO L226 Difference]: Without dead ends: 300 [2021-11-12 22:37:01,310 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 [2021-11-12 22:37:01,311 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 231 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 376.41ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.68ms SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 436.52ms IncrementalHoareTripleChecker+Time [2021-11-12 22:37:01,311 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [231 Valid, 128 Invalid, 98 Unknown, 0 Unchecked, 1.68ms Time], IncrementalHoareTripleChecker [10 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 436.52ms Time] [2021-11-12 22:37:01,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2021-11-12 22:37:01,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 184. [2021-11-12 22:37:01,317 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) [2021-11-12 22:37:01,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 231 transitions. [2021-11-12 22:37:01,318 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 231 transitions. Word has length 26 [2021-11-12 22:37:01,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:37:01,319 INFO L470 AbstractCegarLoop]: Abstraction has 184 states and 231 transitions. [2021-11-12 22:37:01,319 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) [2021-11-12 22:37:01,319 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 231 transitions. [2021-11-12 22:37:01,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-12 22:37:01,320 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:37:01,320 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] [2021-11-12 22:37:01,329 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (47)] Ended with exit code 0 [2021-11-12 22:37:01,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:37:01,525 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)] === [2021-11-12 22:37:01,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:37:01,525 INFO L85 PathProgramCache]: Analyzing trace with hash 460228407, now seen corresponding path program 1 times [2021-11-12 22:37:01,526 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:37:01,526 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1028124712] [2021-11-12 22:37:01,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:37:01,526 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:37:01,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:37:01,529 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:37:01,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-12 22:37:01,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:37:01,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:37:01,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:01,655 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:37:01,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:01,692 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:37:01,693 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:37:01,693 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1028124712] [2021-11-12 22:37:01,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1028124712] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:37:01,693 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:37:01,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-12 22:37:01,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374374673] [2021-11-12 22:37:01,693 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:37:01,697 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:37:01,697 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:37:01,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:37:01,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 22:37:01,697 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) [2021-11-12 22:37:01,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:37:01,708 INFO L93 Difference]: Finished difference Result 195 states and 243 transitions. [2021-11-12 22:37:01,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:37:01,708 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 [2021-11-12 22:37:01,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:37:01,709 INFO L225 Difference]: With dead ends: 195 [2021-11-12 22:37:01,709 INFO L226 Difference]: Without dead ends: 195 [2021-11-12 22:37:01,710 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 [2021-11-12 22:37:01,710 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 11 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.62ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.14ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.31ms IncrementalHoareTripleChecker+Time [2021-11-12 22:37:01,710 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 66 Invalid, 9 Unknown, 0 Unchecked, 0.14ms Time], IncrementalHoareTripleChecker [2 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 9.31ms Time] [2021-11-12 22:37:01,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-11-12 22:37:01,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 188. [2021-11-12 22:37:01,715 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) [2021-11-12 22:37:01,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 235 transitions. [2021-11-12 22:37:01,716 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 235 transitions. Word has length 28 [2021-11-12 22:37:01,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:37:01,717 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 235 transitions. [2021-11-12 22:37:01,717 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) [2021-11-12 22:37:01,717 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 235 transitions. [2021-11-12 22:37:01,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-12 22:37:01,718 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:37:01,718 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] [2021-11-12 22:37:01,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-12 22:37:01,929 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:37:01,929 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)] === [2021-11-12 22:37:01,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:37:01,930 INFO L85 PathProgramCache]: Analyzing trace with hash -1314778955, now seen corresponding path program 1 times [2021-11-12 22:37:01,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:37:01,930 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2048726564] [2021-11-12 22:37:01,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:37:01,930 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:37:01,930 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:37:01,931 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:37:01,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2021-11-12 22:37:02,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:37:02,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-12 22:37:02,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:02,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-12 22:37:04,738 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:37:04,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:09,073 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:37:09,073 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:37:09,074 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2048726564] [2021-11-12 22:37:09,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2048726564] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 22:37:09,074 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:37:09,074 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 8 [2021-11-12 22:37:09,074 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696374946] [2021-11-12 22:37:09,074 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 22:37:09,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-12 22:37:09,075 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:37:09,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-12 22:37:09,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=45, Unknown=3, NotChecked=0, Total=72 [2021-11-12 22:37:09,076 INFO L87 Difference]: Start difference. First operand 188 states and 235 transitions. Second operand has 9 states, 8 states have (on average 7.0) internal successors, (56), 9 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) [2021-11-12 22:37:09,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:37:09,305 INFO L93 Difference]: Finished difference Result 187 states and 234 transitions. [2021-11-12 22:37:09,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 22:37:09,306 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 7.0) internal successors, (56), 9 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) Word has length 28 [2021-11-12 22:37:09,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:37:09,307 INFO L225 Difference]: With dead ends: 187 [2021-11-12 22:37:09,307 INFO L226 Difference]: Without dead ends: 185 [2021-11-12 22:37:09,307 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=29, Invalid=58, Unknown=3, NotChecked=0, Total=90 [2021-11-12 22:37:09,308 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 48 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 153.75ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.96ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 168.34ms IncrementalHoareTripleChecker+Time [2021-11-12 22:37:09,308 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 113 Invalid, 47 Unknown, 0 Unchecked, 0.96ms Time], IncrementalHoareTripleChecker [3 Valid, 23 Invalid, 0 Unknown, 21 Unchecked, 168.34ms Time] [2021-11-12 22:37:09,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-11-12 22:37:09,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2021-11-12 22:37:09,313 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) [2021-11-12 22:37:09,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 229 transitions. [2021-11-12 22:37:09,315 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 229 transitions. Word has length 28 [2021-11-12 22:37:09,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:37:09,315 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 229 transitions. [2021-11-12 22:37:09,315 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 7.0) internal successors, (56), 9 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) [2021-11-12 22:37:09,315 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 229 transitions. [2021-11-12 22:37:09,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-12 22:37:09,316 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:37:09,316 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] [2021-11-12 22:37:09,329 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (49)] Ended with exit code 0 [2021-11-12 22:37:09,529 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:37:09,529 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:37:09,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:37:09,530 INFO L85 PathProgramCache]: Analyzing trace with hash -1314778088, now seen corresponding path program 1 times [2021-11-12 22:37:09,530 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:37:09,530 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [47738712] [2021-11-12 22:37:09,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:37:09,530 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:37:09,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:37:09,531 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:37:09,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-12 22:37:09,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:37:09,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-12 22:37:09,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:09,701 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:37:09,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:09,795 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:37:09,795 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:37:09,795 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [47738712] [2021-11-12 22:37:09,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [47738712] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:37:09,795 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [199112506] [2021-11-12 22:37:09,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:37:09,795 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:37:09,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:37:09,798 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:37:09,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2021-11-12 22:37:09,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:37:09,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-12 22:37:09,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:09,973 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:37:09,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:10,043 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:37:10,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [199112506] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:37:10,044 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1677683213] [2021-11-12 22:37:10,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:37:10,044 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:37:10,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:37:10,045 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:37:10,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-12 22:37:10,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:37:10,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-12 22:37:10,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:10,208 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:37:10,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:10,299 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:37:10,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1677683213] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:37:10,299 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:37:10,299 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-12 22:37:10,299 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117692333] [2021-11-12 22:37:10,300 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:37:10,300 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-12 22:37:10,300 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:37:10,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-12 22:37:10,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-12 22:37:10,301 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) [2021-11-12 22:37:10,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:37:10,436 INFO L93 Difference]: Finished difference Result 260 states and 314 transitions. [2021-11-12 22:37:10,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 22:37:10,437 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 [2021-11-12 22:37:10,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:37:10,438 INFO L225 Difference]: With dead ends: 260 [2021-11-12 22:37:10,438 INFO L226 Difference]: Without dead ends: 222 [2021-11-12 22:37:10,438 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 [2021-11-12 22:37:10,439 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 22 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 92.35ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.71ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 109.88ms IncrementalHoareTripleChecker+Time [2021-11-12 22:37:10,440 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 201 Invalid, 58 Unknown, 0 Unchecked, 0.71ms Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 109.88ms Time] [2021-11-12 22:37:10,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-11-12 22:37:10,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 219. [2021-11-12 22:37:10,447 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) [2021-11-12 22:37:10,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 271 transitions. [2021-11-12 22:37:10,449 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 271 transitions. Word has length 28 [2021-11-12 22:37:10,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:37:10,449 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 271 transitions. [2021-11-12 22:37:10,449 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) [2021-11-12 22:37:10,449 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 271 transitions. [2021-11-12 22:37:10,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-12 22:37:10,450 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:37:10,450 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] [2021-11-12 22:37:10,461 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (50)] Forceful destruction successful, exit code 0 [2021-11-12 22:37:10,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (51)] Forceful destruction successful, exit code 0 [2021-11-12 22:37:10,881 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2021-11-12 22:37:11,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:37:11,058 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:37:11,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:37:11,058 INFO L85 PathProgramCache]: Analyzing trace with hash -1252738474, now seen corresponding path program 1 times [2021-11-12 22:37:11,058 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:37:11,058 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [540926878] [2021-11-12 22:37:11,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:37:11,059 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:37:11,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:37:11,059 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:37:11,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2021-11-12 22:37:11,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:37:11,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 22:37:11,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:11,341 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:37:11,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:11,521 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:37:11,522 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:37:11,522 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [540926878] [2021-11-12 22:37:11,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [540926878] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:37:11,522 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2016706974] [2021-11-12 22:37:11,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:37:11,522 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:37:11,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:37:11,523 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:37:11,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (54)] Waiting until timeout for monitored process [2021-11-12 22:37:11,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:37:11,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 22:37:11,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:11,766 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:37:11,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:11,853 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:37:11,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2016706974] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:37:11,853 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [84971075] [2021-11-12 22:37:11,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:37:11,854 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:37:11,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:37:11,854 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:37:11,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-12 22:37:11,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:37:11,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 22:37:11,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:12,095 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:37:12,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:12,205 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:37:12,205 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [84971075] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:37:12,206 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:37:12,206 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 8, 7, 8, 7] total 13 [2021-11-12 22:37:12,206 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575488531] [2021-11-12 22:37:12,206 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:37:12,207 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-12 22:37:12,207 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:37:12,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-12 22:37:12,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-12 22:37:12,208 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) [2021-11-12 22:37:12,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:37:12,586 INFO L93 Difference]: Finished difference Result 294 states and 356 transitions. [2021-11-12 22:37:12,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-12 22:37:12,588 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 [2021-11-12 22:37:12,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:37:12,589 INFO L225 Difference]: With dead ends: 294 [2021-11-12 22:37:12,589 INFO L226 Difference]: Without dead ends: 262 [2021-11-12 22:37:12,590 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=219, Unknown=0, NotChecked=0, Total=306 [2021-11-12 22:37:12,590 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 136 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 186.98ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.24ms SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 234.25ms IncrementalHoareTripleChecker+Time [2021-11-12 22:37:12,590 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 183 Invalid, 115 Unknown, 0 Unchecked, 1.24ms Time], IncrementalHoareTripleChecker [13 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 234.25ms Time] [2021-11-12 22:37:12,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2021-11-12 22:37:12,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 219. [2021-11-12 22:37:12,596 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) [2021-11-12 22:37:12,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 270 transitions. [2021-11-12 22:37:12,598 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 270 transitions. Word has length 28 [2021-11-12 22:37:12,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:37:12,598 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 270 transitions. [2021-11-12 22:37:12,598 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) [2021-11-12 22:37:12,598 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 270 transitions. [2021-11-12 22:37:12,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-12 22:37:12,599 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:37:12,599 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] [2021-11-12 22:37:12,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-12 22:37:12,821 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (53)] Ended with exit code 0 [2021-11-12 22:37:13,015 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (54)] Ended with exit code 0 [2021-11-12 22:37:13,214 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:37:13,214 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:37:13,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:37:13,214 INFO L85 PathProgramCache]: Analyzing trace with hash 1138703979, now seen corresponding path program 2 times [2021-11-12 22:37:13,214 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:37:13,214 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1734294522] [2021-11-12 22:37:13,214 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:37:13,215 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:37:13,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:37:13,215 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:37:13,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-12 22:37:13,288 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:37:13,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:37:13,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 22:37:13,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:13,479 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:37:13,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:14,035 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 [2021-11-12 22:37:14,467 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:37:14,467 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:37:14,468 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1734294522] [2021-11-12 22:37:14,468 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1734294522] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:37:14,468 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1368883667] [2021-11-12 22:37:14,468 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:37:14,469 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:37:14,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:37:14,469 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:37:14,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (57)] Waiting until timeout for monitored process [2021-11-12 22:37:14,634 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:37:14,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:37:14,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-12 22:37:14,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:14,747 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-12 22:37:14,747 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 [2021-11-12 22:37:14,751 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 [2021-11-12 22:37:24,844 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:37:24,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:26,291 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 34 treesize of output 32 [2021-11-12 22:37:26,299 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:37:26,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1368883667] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:37:26,299 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130273077] [2021-11-12 22:37:26,300 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:37:26,300 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:37:26,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:37:26,301 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:37:26,302 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-12 22:37:26,359 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:37:26,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:37:26,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 22:37:26,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:26,500 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:37:26,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:26,687 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 [2021-11-12 22:37:26,810 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:37:26,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2130273077] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:37:26,811 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:37:26,811 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11, 10, 8, 8] total 30 [2021-11-12 22:37:26,811 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088047628] [2021-11-12 22:37:26,811 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:37:26,812 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-12 22:37:26,812 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:37:26,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-12 22:37:26,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=766, Unknown=0, NotChecked=0, Total=930 [2021-11-12 22:37:26,813 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) [2021-11-12 22:37:29,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:37:29,466 INFO L93 Difference]: Finished difference Result 289 states and 355 transitions. [2021-11-12 22:37:29,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-12 22:37:29,468 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 [2021-11-12 22:37:29,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:37:29,470 INFO L225 Difference]: With dead ends: 289 [2021-11-12 22:37:29,470 INFO L226 Difference]: Without dead ends: 289 [2021-11-12 22:37:29,471 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 461 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=246, Invalid=1160, Unknown=0, NotChecked=0, Total=1406 [2021-11-12 22:37:29,472 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 60 mSDsluCounter, 342 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 613.01ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 373 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.84ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 71 IncrementalHoareTripleChecker+Unchecked, 683.20ms IncrementalHoareTripleChecker+Time [2021-11-12 22:37:29,472 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 373 Invalid, 172 Unknown, 0 Unchecked, 1.84ms Time], IncrementalHoareTripleChecker [2 Valid, 99 Invalid, 0 Unknown, 71 Unchecked, 683.20ms Time] [2021-11-12 22:37:29,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-12 22:37:29,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 260. [2021-11-12 22:37:29,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 255 states have (on average 1.2745098039215685) internal successors, (325), 259 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:37:29,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 325 transitions. [2021-11-12 22:37:29,482 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 325 transitions. Word has length 29 [2021-11-12 22:37:29,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:37:29,482 INFO L470 AbstractCegarLoop]: Abstraction has 260 states and 325 transitions. [2021-11-12 22:37:29,483 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) [2021-11-12 22:37:29,483 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 325 transitions. [2021-11-12 22:37:29,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-12 22:37:29,484 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:37:29,484 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] [2021-11-12 22:37:29,489 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (57)] Forceful destruction successful, exit code 0 [2021-11-12 22:37:29,701 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (56)] Forceful destruction successful, exit code 0 [2021-11-12 22:37:29,937 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-12 22:37:30,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:37:30,096 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:37:30,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:37:30,096 INFO L85 PathProgramCache]: Analyzing trace with hash -112944909, now seen corresponding path program 2 times [2021-11-12 22:37:30,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:37:30,096 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1485964911] [2021-11-12 22:37:30,096 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:37:30,097 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:37:30,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:37:30,098 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:37:30,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (59)] Waiting until timeout for monitored process [2021-11-12 22:37:30,187 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:37:30,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:37:30,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 22:37:30,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:30,463 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:37:30,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:31,102 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 [2021-11-12 22:37:31,382 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:37:31,383 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:37:31,383 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1485964911] [2021-11-12 22:37:31,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1485964911] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:37:31,383 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [329650463] [2021-11-12 22:37:31,383 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:37:31,383 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:37:31,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:37:31,385 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:37:31,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (60)] Waiting until timeout for monitored process [2021-11-12 22:37:31,520 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:37:31,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:37:31,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-12 22:37:31,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:31,641 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-12 22:37:31,642 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 [2021-11-12 22:37:31,649 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:37:31,649 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 [2021-11-12 22:37:35,498 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:37:35,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:36,788 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:37:36,788 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 [2021-11-12 22:37:36,796 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:37:36,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [329650463] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:37:36,797 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1922334791] [2021-11-12 22:37:36,797 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:37:36,797 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:37:36,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:37:36,798 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:37:36,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-12 22:37:36,866 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:37:36,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:37:36,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 22:37:36,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:37,095 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:37:37,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:37,404 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 [2021-11-12 22:37:37,502 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:37:37,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1922334791] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:37:37,502 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:37:37,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 9, 8, 6, 6] total 23 [2021-11-12 22:37:37,503 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162373653] [2021-11-12 22:37:37,503 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:37:37,503 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-12 22:37:37,503 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:37:37,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-12 22:37:37,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2021-11-12 22:37:37,504 INFO L87 Difference]: Start difference. First operand 260 states and 325 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) [2021-11-12 22:37:40,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:37:40,260 INFO L93 Difference]: Finished difference Result 458 states and 564 transitions. [2021-11-12 22:37:40,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-12 22:37:40,261 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 [2021-11-12 22:37:40,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:37:40,263 INFO L225 Difference]: With dead ends: 458 [2021-11-12 22:37:40,263 INFO L226 Difference]: Without dead ends: 458 [2021-11-12 22:37:40,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=192, Invalid=800, Unknown=0, NotChecked=0, Total=992 [2021-11-12 22:37:40,264 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 94 mSDsluCounter, 383 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 772.72ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 421 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.55ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 89 IncrementalHoareTripleChecker+Unchecked, 865.28ms IncrementalHoareTripleChecker+Time [2021-11-12 22:37:40,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 421 Invalid, 248 Unknown, 0 Unchecked, 1.55ms Time], IncrementalHoareTripleChecker [3 Valid, 156 Invalid, 0 Unknown, 89 Unchecked, 865.28ms Time] [2021-11-12 22:37:40,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2021-11-12 22:37:40,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 335. [2021-11-12 22:37:40,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 330 states have (on average 1.2787878787878788) internal successors, (422), 334 states have internal predecessors, (422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:37:40,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 422 transitions. [2021-11-12 22:37:40,274 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 422 transitions. Word has length 32 [2021-11-12 22:37:40,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:37:40,275 INFO L470 AbstractCegarLoop]: Abstraction has 335 states and 422 transitions. [2021-11-12 22:37:40,275 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) [2021-11-12 22:37:40,275 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 422 transitions. [2021-11-12 22:37:40,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-12 22:37:40,276 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:37:40,276 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] [2021-11-12 22:37:40,297 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (59)] Forceful destruction successful, exit code 0 [2021-11-12 22:37:40,521 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-11-12 22:37:40,707 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (60)] Forceful destruction successful, exit code 0 [2021-11-12 22:37:40,905 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:37:40,905 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:37:40,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:37:40,906 INFO L85 PathProgramCache]: Analyzing trace with hash -1409463453, now seen corresponding path program 3 times [2021-11-12 22:37:40,906 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:37:40,906 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1895908193] [2021-11-12 22:37:40,906 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:37:40,907 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:37:40,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:37:40,907 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:37:40,908 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (62)] Waiting until timeout for monitored process [2021-11-12 22:37:41,039 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-12 22:37:41,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:37:41,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-12 22:37:41,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:41,116 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-12 22:37:41,117 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 [2021-11-12 22:37:41,120 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 [2021-11-12 22:37:46,839 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-12 22:37:46,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:48,623 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 [2021-11-12 22:37:48,726 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-12 22:37:48,727 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:37:48,727 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1895908193] [2021-11-12 22:37:48,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1895908193] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:37:48,727 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [787514012] [2021-11-12 22:37:48,727 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:37:48,727 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:37:48,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:37:48,729 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:37:48,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (63)] Waiting until timeout for monitored process [2021-11-12 22:37:48,939 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-12 22:37:48,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:37:48,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-12 22:37:48,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:49,008 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-12 22:37:49,008 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 32 treesize of output 39 [2021-11-12 22:37:49,012 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 [2021-11-12 22:37:49,845 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-12 22:37:49,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:52,205 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 [2021-11-12 22:37:52,231 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-12 22:37:52,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [787514012] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:37:52,232 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426272060] [2021-11-12 22:37:52,232 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:37:52,233 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:37:52,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:37:52,235 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:37:52,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-12 22:37:52,355 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-12 22:37:52,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:37:52,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-12 22:37:52,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:37:53,122 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:37:53,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:37:54,375 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:37:54,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1426272060] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:37:54,375 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:37:54,375 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 12, 11] total 40 [2021-11-12 22:37:54,376 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783421802] [2021-11-12 22:37:54,376 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:37:54,376 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-12 22:37:54,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:37:54,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-12 22:37:54,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=1348, Unknown=0, NotChecked=0, Total=1560 [2021-11-12 22:37:54,378 INFO L87 Difference]: Start difference. First operand 335 states and 422 transitions. Second operand has 40 states, 40 states have (on average 3.325) internal successors, (133), 40 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:38:27,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:38:27,176 INFO L93 Difference]: Finished difference Result 459 states and 586 transitions. [2021-11-12 22:38:27,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-12 22:38:27,178 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 3.325) internal successors, (133), 40 states have internal predecessors, (133), 0 states have call successors, (0), 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 [2021-11-12 22:38:27,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:38:27,180 INFO L225 Difference]: With dead ends: 459 [2021-11-12 22:38:27,180 INFO L226 Difference]: Without dead ends: 448 [2021-11-12 22:38:27,181 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 161 SyntacticMatches, 7 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1248 ImplicationChecksByTransitivity, 40.6s TimeCoverageRelationStatistics Valid=523, Invalid=3137, Unknown=0, NotChecked=0, Total=3660 [2021-11-12 22:38:27,182 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 52 mSDsluCounter, 361 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 544.70ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 387 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.17ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 34 IncrementalHoareTripleChecker+Unchecked, 592.78ms IncrementalHoareTripleChecker+Time [2021-11-12 22:38:27,182 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 387 Invalid, 128 Unknown, 0 Unchecked, 1.17ms Time], IncrementalHoareTripleChecker [3 Valid, 91 Invalid, 0 Unknown, 34 Unchecked, 592.78ms Time] [2021-11-12 22:38:27,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2021-11-12 22:38:27,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 388. [2021-11-12 22:38:27,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 383 states have (on average 1.3133159268929504) internal successors, (503), 387 states have internal predecessors, (503), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:38:27,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 503 transitions. [2021-11-12 22:38:27,193 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 503 transitions. Word has length 33 [2021-11-12 22:38:27,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:38:27,193 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 503 transitions. [2021-11-12 22:38:27,194 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 3.325) internal successors, (133), 40 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:38:27,194 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 503 transitions. [2021-11-12 22:38:27,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-12 22:38:27,195 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:38:27,195 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] [2021-11-12 22:38:27,213 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (63)] Ended with exit code 0 [2021-11-12 22:38:27,417 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Ended with exit code 0 [2021-11-12 22:38:27,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (62)] Forceful destruction successful, exit code 0 [2021-11-12 22:38:27,798 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:38:27,798 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:38:27,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:38:27,798 INFO L85 PathProgramCache]: Analyzing trace with hash -54518167, now seen corresponding path program 1 times [2021-11-12 22:38:27,799 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:38:27,799 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [852782813] [2021-11-12 22:38:27,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:27,799 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:38:27,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:38:27,800 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:38:27,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (65)] Waiting until timeout for monitored process [2021-11-12 22:38:27,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:27,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 22:38:27,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:38:28,221 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:38:28,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:38:29,022 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 [2021-11-12 22:38:29,336 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:38:29,337 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:38:29,337 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [852782813] [2021-11-12 22:38:29,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [852782813] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:38:29,337 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1847219338] [2021-11-12 22:38:29,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:29,338 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:38:29,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:38:29,341 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:38:29,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (66)] Waiting until timeout for monitored process [2021-11-12 22:38:29,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:29,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-12 22:38:29,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:38:29,679 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:38:29,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:38:30,131 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 [2021-11-12 22:38:30,266 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:38:30,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1847219338] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:38:30,266 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659017650] [2021-11-12 22:38:30,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:38:30,267 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:38:30,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:38:30,267 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:38:30,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-12 22:38:30,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:38:30,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 22:38:30,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:38:30,597 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:38:30,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:38:31,106 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 [2021-11-12 22:38:31,208 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:38:31,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [659017650] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:38:31,208 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:38:31,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 11 [2021-11-12 22:38:31,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114980608] [2021-11-12 22:38:31,209 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:38:31,209 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-12 22:38:31,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:38:31,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-12 22:38:31,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-11-12 22:38:31,210 INFO L87 Difference]: Start difference. First operand 388 states and 503 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) [2021-11-12 22:38:33,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:38:33,494 INFO L93 Difference]: Finished difference Result 1069 states and 1390 transitions. [2021-11-12 22:38:33,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-12 22:38:33,495 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 [2021-11-12 22:38:33,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:38:33,500 INFO L225 Difference]: With dead ends: 1069 [2021-11-12 22:38:33,500 INFO L226 Difference]: Without dead ends: 1069 [2021-11-12 22:38:33,501 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=148, Invalid=452, Unknown=0, NotChecked=0, Total=600 [2021-11-12 22:38:33,502 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 423 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 935.63ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 423 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.18ms SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1061.87ms IncrementalHoareTripleChecker+Time [2021-11-12 22:38:33,502 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [423 Valid, 266 Invalid, 289 Unknown, 0 Unchecked, 2.18ms Time], IncrementalHoareTripleChecker [27 Valid, 262 Invalid, 0 Unknown, 0 Unchecked, 1061.87ms Time] [2021-11-12 22:38:33,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1069 states. [2021-11-12 22:38:33,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1069 to 337. [2021-11-12 22:38:33,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 332 states have (on average 1.2891566265060241) internal successors, (428), 336 states have internal predecessors, (428), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:38:33,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 428 transitions. [2021-11-12 22:38:33,518 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 428 transitions. Word has length 35 [2021-11-12 22:38:33,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:38:33,518 INFO L470 AbstractCegarLoop]: Abstraction has 337 states and 428 transitions. [2021-11-12 22:38:33,518 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) [2021-11-12 22:38:33,518 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 428 transitions. [2021-11-12 22:38:33,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-12 22:38:33,519 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:38:33,520 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1] [2021-11-12 22:38:33,537 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (66)] Ended with exit code 0 [2021-11-12 22:38:33,745 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2021-11-12 22:38:33,931 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (65)] Ended with exit code 0 [2021-11-12 22:38:34,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:38:34,123 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:38:34,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:38:34,123 INFO L85 PathProgramCache]: Analyzing trace with hash 1249695552, now seen corresponding path program 3 times [2021-11-12 22:38:34,124 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:38:34,124 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [309960789] [2021-11-12 22:38:34,124 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:38:34,124 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:38:34,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:38:34,125 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:38:34,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (68)] Waiting until timeout for monitored process [2021-11-12 22:38:34,265 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-12 22:38:34,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:38:34,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-12 22:38:34,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:38:34,342 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-12 22:38:34,343 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 [2021-11-12 22:38:34,349 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:38:34,349 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 [2021-11-12 22:38:37,727 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:38:37,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:38:40,458 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:38:40,458 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 [2021-11-12 22:38:40,605 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:38:40,605 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:38:40,605 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [309960789] [2021-11-12 22:38:40,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [309960789] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:38:40,605 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [763775793] [2021-11-12 22:38:40,605 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:38:40,605 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:38:40,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:38:40,606 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:38:40,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (69)] Waiting until timeout for monitored process [2021-11-12 22:38:41,027 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-12 22:38:41,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:38:41,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-12 22:38:41,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:38:41,218 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-12 22:38:41,219 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 [2021-11-12 22:38:41,237 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:38:41,237 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 [2021-11-12 22:38:45,444 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:38:45,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:38:54,571 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:38:54,572 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 181 treesize of output 177 [2021-11-12 22:38:54,815 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:38:54,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [763775793] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:38:54,816 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449863454] [2021-11-12 22:38:54,816 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:38:54,816 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:38:54,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:38:54,825 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:38:54,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-12 22:38:55,749 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-12 22:38:55,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:38:55,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-12 22:38:55,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:38:55,842 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-12 22:38:55,842 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 [2021-11-12 22:38:55,850 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:38:55,850 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 [2021-11-12 22:38:59,136 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:38:59,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:39:05,648 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:39:05,648 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 180 treesize of output 176 [2021-11-12 22:39:05,706 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 22:39:05,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1449863454] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:39:05,706 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:39:05,706 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 15, 15, 14, 14] total 54 [2021-11-12 22:39:05,707 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913077289] [2021-11-12 22:39:05,707 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:39:05,707 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-12 22:39:05,707 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:39:05,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-12 22:39:05,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=819, Invalid=2151, Unknown=0, NotChecked=0, Total=2970 [2021-11-12 22:39:05,709 INFO L87 Difference]: Start difference. First operand 337 states and 428 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) [2021-11-12 22:39:24,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:39:24,280 INFO L93 Difference]: Finished difference Result 401 states and 508 transitions. [2021-11-12 22:39:24,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-12 22:39:24,281 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 [2021-11-12 22:39:24,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:39:24,283 INFO L225 Difference]: With dead ends: 401 [2021-11-12 22:39:24,283 INFO L226 Difference]: Without dead ends: 401 [2021-11-12 22:39:24,285 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 153 SyntacticMatches, 9 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2640 ImplicationChecksByTransitivity, 30.2s TimeCoverageRelationStatistics Valid=1671, Invalid=4029, Unknown=0, NotChecked=0, Total=5700 [2021-11-12 22:39:24,285 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 86 mSDsluCounter, 320 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1807.10ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.51ms SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 34 IncrementalHoareTripleChecker+Unchecked, 1951.09ms IncrementalHoareTripleChecker+Time [2021-11-12 22:39:24,286 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 358 Invalid, 188 Unknown, 0 Unchecked, 1.51ms Time], IncrementalHoareTripleChecker [10 Valid, 144 Invalid, 0 Unknown, 34 Unchecked, 1951.09ms Time] [2021-11-12 22:39:24,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2021-11-12 22:39:24,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 401. [2021-11-12 22:39:24,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 401 states, 396 states have (on average 1.2828282828282829) internal successors, (508), 400 states have internal predecessors, (508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:39:24,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 401 states to 401 states and 508 transitions. [2021-11-12 22:39:24,296 INFO L78 Accepts]: Start accepts. Automaton has 401 states and 508 transitions. Word has length 35 [2021-11-12 22:39:24,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:39:24,297 INFO L470 AbstractCegarLoop]: Abstraction has 401 states and 508 transitions. [2021-11-12 22:39:24,297 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) [2021-11-12 22:39:24,297 INFO L276 IsEmpty]: Start isEmpty. Operand 401 states and 508 transitions. [2021-11-12 22:39:24,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-12 22:39:24,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:39:24,299 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] [2021-11-12 22:39:24,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (68)] Forceful destruction successful, exit code 0 [2021-11-12 22:39:24,515 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (69)] Ended with exit code 0 [2021-11-12 22:39:24,739 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Ended with exit code 0 [2021-11-12 22:39:24,913 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:39:24,913 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:39:24,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:39:24,914 INFO L85 PathProgramCache]: Analyzing trace with hash -524293744, now seen corresponding path program 3 times [2021-11-12 22:39:24,914 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:39:24,914 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1368538046] [2021-11-12 22:39:24,915 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:39:24,915 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:39:24,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:39:24,916 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:39:24,918 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (71)] Waiting until timeout for monitored process [2021-11-12 22:39:25,159 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-12 22:39:25,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:39:25,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-12 22:39:25,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:39:25,273 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-12 22:39:25,273 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 [2021-11-12 22:39:25,280 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:39:25,280 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 [2021-11-12 22:39:28,864 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:39:28,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:39:33,380 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 24 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:39:33,380 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:39:33,380 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1368538046] [2021-11-12 22:39:33,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1368538046] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:39:33,380 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [115315251] [2021-11-12 22:39:33,380 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:39:33,380 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:39:33,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:39:33,381 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:39:33,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (72)] Waiting until timeout for monitored process [2021-11-12 22:39:33,805 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-12 22:39:33,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:39:33,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-12 22:39:33,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:39:33,885 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-12 22:39:33,885 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 [2021-11-12 22:39:33,893 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:39:33,893 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 [2021-11-12 22:39:36,547 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-12 22:39:36,548 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 [2021-11-12 22:39:36,746 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:39:36,747 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:39:39,859 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 7 proven. 18 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:39:39,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [115315251] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:39:39,860 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1420209101] [2021-11-12 22:39:39,860 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:39:39,860 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:39:39,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:39:39,861 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:39:39,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-12 22:39:40,027 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-12 22:39:40,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:39:40,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-12 22:39:40,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:39:40,243 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-12 22:39:40,244 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 [2021-11-12 22:39:40,253 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:39:40,253 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 [2021-11-12 22:39:44,786 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 18 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:39:44,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:39:47,126 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:39:47,127 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 129 treesize of output 125 [2021-11-12 22:39:47,322 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 18 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:39:47,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1420209101] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:39:47,322 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:39:47,323 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 12, 11, 8, 8] total 43 [2021-11-12 22:39:47,323 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296484674] [2021-11-12 22:39:47,323 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:39:47,323 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-12 22:39:47,323 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:39:47,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-12 22:39:47,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=1530, Unknown=0, NotChecked=0, Total=1806 [2021-11-12 22:39:47,325 INFO L87 Difference]: Start difference. First operand 401 states and 508 transitions. Second operand has 43 states, 43 states have (on average 4.162790697674419) internal successors, (179), 43 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:39:54,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:39:54,261 INFO L93 Difference]: Finished difference Result 714 states and 907 transitions. [2021-11-12 22:39:54,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-12 22:39:54,261 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 4.162790697674419) internal successors, (179), 43 states have internal predecessors, (179), 0 states have call successors, (0), 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 [2021-11-12 22:39:54,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:39:54,265 INFO L225 Difference]: With dead ends: 714 [2021-11-12 22:39:54,265 INFO L226 Difference]: Without dead ends: 708 [2021-11-12 22:39:54,266 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 200 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1136 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=453, Invalid=2627, Unknown=0, NotChecked=0, Total=3080 [2021-11-12 22:39:54,267 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 247 mSDsluCounter, 610 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1369.74ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 247 SdHoareTripleChecker+Valid, 652 SdHoareTripleChecker+Invalid, 308 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.07ms SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 169 IncrementalHoareTripleChecker+Unchecked, 1474.47ms IncrementalHoareTripleChecker+Time [2021-11-12 22:39:54,267 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [247 Valid, 652 Invalid, 308 Unknown, 0 Unchecked, 2.07ms Time], IncrementalHoareTripleChecker [11 Valid, 128 Invalid, 0 Unknown, 169 Unchecked, 1474.47ms Time] [2021-11-12 22:39:54,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 708 states. [2021-11-12 22:39:54,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 708 to 599. [2021-11-12 22:39:54,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 599 states, 594 states have (on average 1.3198653198653199) internal successors, (784), 598 states have internal predecessors, (784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:39:54,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 599 states to 599 states and 784 transitions. [2021-11-12 22:39:54,284 INFO L78 Accepts]: Start accepts. Automaton has 599 states and 784 transitions. Word has length 40 [2021-11-12 22:39:54,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:39:54,285 INFO L470 AbstractCegarLoop]: Abstraction has 599 states and 784 transitions. [2021-11-12 22:39:54,285 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 4.162790697674419) internal successors, (179), 43 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:39:54,285 INFO L276 IsEmpty]: Start isEmpty. Operand 599 states and 784 transitions. [2021-11-12 22:39:54,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-12 22:39:54,287 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:39:54,287 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:39:54,298 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (72)] Forceful destruction successful, exit code 0 [2021-11-12 22:39:54,499 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (71)] Ended with exit code 0 [2021-11-12 22:39:54,711 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Ended with exit code 0 [2021-11-12 22:39:54,890 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:39:54,890 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:39:54,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:39:54,891 INFO L85 PathProgramCache]: Analyzing trace with hash -1396579989, now seen corresponding path program 3 times [2021-11-12 22:39:54,891 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:39:54,891 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [680739386] [2021-11-12 22:39:54,891 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:39:54,891 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:39:54,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:39:54,892 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:39:54,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (74)] Waiting until timeout for monitored process [2021-11-12 22:39:55,034 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-12 22:39:55,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:39:55,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-12 22:39:55,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:39:55,093 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-12 22:39:55,094 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 [2021-11-12 22:39:55,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 40 [2021-11-12 22:40:06,124 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:40:06,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:40:11,270 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 77 treesize of output 75 [2021-11-12 22:40:11,483 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:40:11,484 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:40:11,484 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [680739386] [2021-11-12 22:40:11,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [680739386] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:40:11,484 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1222228079] [2021-11-12 22:40:11,484 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:40:11,484 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:40:11,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:40:11,485 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:40:11,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (75)] Waiting until timeout for monitored process [2021-11-12 22:40:12,011 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-12 22:40:12,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:40:12,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-12 22:40:12,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:40:12,113 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-12 22:40:12,114 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 [2021-11-12 22:40:12,117 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 [2021-11-12 22:40:21,192 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:40:21,192 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:40:31,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 78 treesize of output 76 [2021-11-12 22:40:31,610 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:40:31,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1222228079] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:40:31,611 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [279842842] [2021-11-12 22:40:31,611 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:40:31,611 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:40:31,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:40:31,619 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:40:31,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-12 22:40:34,964 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-12 22:40:34,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:40:34,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-12 22:40:34,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:40:35,040 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-12 22:40:35,040 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 [2021-11-12 22:40:35,047 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 [2021-11-12 22:40:36,368 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:40:36,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:40:41,016 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 [2021-11-12 22:40:41,037 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:40:41,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [279842842] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:40:41,037 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:40:41,037 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 16, 16, 13, 13] total 48 [2021-11-12 22:40:41,038 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166978453] [2021-11-12 22:40:41,038 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:40:41,038 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-12 22:40:41,038 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:40:41,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-12 22:40:41,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=1751, Unknown=0, NotChecked=0, Total=2352 [2021-11-12 22:40:41,040 INFO L87 Difference]: Start difference. First operand 599 states and 784 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) [2021-11-12 22:41:12,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:41:12,085 INFO L93 Difference]: Finished difference Result 695 states and 904 transitions. [2021-11-12 22:41:12,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-12 22:41:12,086 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 [2021-11-12 22:41:12,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:41:12,088 INFO L225 Difference]: With dead ends: 695 [2021-11-12 22:41:12,088 INFO L226 Difference]: Without dead ends: 695 [2021-11-12 22:41:12,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 197 SyntacticMatches, 6 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1932 ImplicationChecksByTransitivity, 58.7s TimeCoverageRelationStatistics Valid=1430, Invalid=3826, Unknown=0, NotChecked=0, Total=5256 [2021-11-12 22:41:12,090 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 90 mSDsluCounter, 359 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2287.87ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 395 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.60ms SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 2469.82ms IncrementalHoareTripleChecker+Time [2021-11-12 22:41:12,091 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 395 Invalid, 251 Unknown, 0 Unchecked, 1.60ms Time], IncrementalHoareTripleChecker [8 Valid, 200 Invalid, 0 Unknown, 43 Unchecked, 2469.82ms Time] [2021-11-12 22:41:12,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2021-11-12 22:41:12,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 695. [2021-11-12 22:41:12,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 695 states, 690 states have (on average 1.3101449275362318) internal successors, (904), 694 states have internal predecessors, (904), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:41:12,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 695 states to 695 states and 904 transitions. [2021-11-12 22:41:12,103 INFO L78 Accepts]: Start accepts. Automaton has 695 states and 904 transitions. Word has length 41 [2021-11-12 22:41:12,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:41:12,104 INFO L470 AbstractCegarLoop]: Abstraction has 695 states and 904 transitions. [2021-11-12 22:41:12,104 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) [2021-11-12 22:41:12,104 INFO L276 IsEmpty]: Start isEmpty. Operand 695 states and 904 transitions. [2021-11-12 22:41:12,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-12 22:41:12,105 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:41:12,106 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] [2021-11-12 22:41:12,162 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Forceful destruction successful, exit code 0 [2021-11-12 22:41:12,336 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (74)] Ended with exit code 0 [2021-11-12 22:41:12,532 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (75)] Forceful destruction successful, exit code 0 [2021-11-12 22:41:12,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:41:12,729 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:41:12,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:41:12,730 INFO L85 PathProgramCache]: Analyzing trace with hash 829184327, now seen corresponding path program 1 times [2021-11-12 22:41:12,730 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:41:12,730 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1604233579] [2021-11-12 22:41:12,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:41:12,730 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:41:12,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:41:12,731 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:41:12,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (77)] Waiting until timeout for monitored process [2021-11-12 22:41:12,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:41:12,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-12 22:41:12,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:41:12,901 INFO L354 Elim1Store]: treesize reduction 42, result has 35.4 percent of original size [2021-11-12 22:41:12,902 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 [2021-11-12 22:41:13,565 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:41:13,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:41:14,672 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:41:14,672 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:41:14,673 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1604233579] [2021-11-12 22:41:14,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1604233579] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:41:14,673 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [575174280] [2021-11-12 22:41:14,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:41:14,673 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:41:14,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:41:14,674 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:41:14,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (78)] Waiting until timeout for monitored process [2021-11-12 22:41:14,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:41:14,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-12 22:41:14,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:41:14,897 INFO L354 Elim1Store]: treesize reduction 42, result has 35.4 percent of original size [2021-11-12 22:41:14,897 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 [2021-11-12 22:41:15,705 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:41:15,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:41:16,987 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:41:16,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [575174280] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:41:16,987 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018638644] [2021-11-12 22:41:16,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:41:16,987 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:41:16,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:41:16,988 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:41:16,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2021-11-12 22:41:17,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:41:17,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-12 22:41:17,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:41:17,183 INFO L354 Elim1Store]: treesize reduction 42, result has 35.4 percent of original size [2021-11-12 22:41:17,184 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 18 treesize of output 30 [2021-11-12 22:41:17,815 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:41:17,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:41:18,475 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:41:18,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018638644] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:41:18,476 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:41:18,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9, 8, 7, 7] total 25 [2021-11-12 22:41:18,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198975214] [2021-11-12 22:41:18,476 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:41:18,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-12 22:41:18,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:41:18,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-12 22:41:18,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=517, Unknown=0, NotChecked=0, Total=650 [2021-11-12 22:41:18,477 INFO L87 Difference]: Start difference. First operand 695 states and 904 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) [2021-11-12 22:41:18,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:41:18,887 INFO L93 Difference]: Finished difference Result 1133 states and 1478 transitions. [2021-11-12 22:41:18,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-12 22:41:18,888 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 [2021-11-12 22:41:18,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:41:18,893 INFO L225 Difference]: With dead ends: 1133 [2021-11-12 22:41:18,894 INFO L226 Difference]: Without dead ends: 1133 [2021-11-12 22:41:18,894 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 218 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=180, Invalid=632, Unknown=0, NotChecked=0, Total=812 [2021-11-12 22:41:18,895 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 211 mSDsluCounter, 423 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 204.98ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 463 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.19ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 108 IncrementalHoareTripleChecker+Unchecked, 234.74ms IncrementalHoareTripleChecker+Time [2021-11-12 22:41:18,895 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 463 Invalid, 239 Unknown, 0 Unchecked, 1.19ms Time], IncrementalHoareTripleChecker [14 Valid, 117 Invalid, 0 Unknown, 108 Unchecked, 234.74ms Time] [2021-11-12 22:41:18,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1133 states. [2021-11-12 22:41:18,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1133 to 738. [2021-11-12 22:41:18,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 738 states, 733 states have (on average 1.3124147339699863) internal successors, (962), 737 states have internal predecessors, (962), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:41:18,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 738 states to 738 states and 962 transitions. [2021-11-12 22:41:18,918 INFO L78 Accepts]: Start accepts. Automaton has 738 states and 962 transitions. Word has length 41 [2021-11-12 22:41:18,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:41:18,918 INFO L470 AbstractCegarLoop]: Abstraction has 738 states and 962 transitions. [2021-11-12 22:41:18,919 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) [2021-11-12 22:41:18,919 INFO L276 IsEmpty]: Start isEmpty. Operand 738 states and 962 transitions. [2021-11-12 22:41:18,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-12 22:41:18,920 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:41:18,920 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] [2021-11-12 22:41:18,922 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (78)] Ended with exit code 0 [2021-11-12 22:41:19,130 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (77)] Ended with exit code 0 [2021-11-12 22:41:19,343 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Ended with exit code 0 [2021-11-12 22:41:19,522 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:41:19,523 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:41:19,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:41:19,523 INFO L85 PathProgramCache]: Analyzing trace with hash 510761222, now seen corresponding path program 1 times [2021-11-12 22:41:19,523 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:41:19,523 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [309295780] [2021-11-12 22:41:19,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:41:19,523 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:41:19,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:41:19,524 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:41:19,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (80)] Waiting until timeout for monitored process [2021-11-12 22:41:19,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:41:19,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-12 22:41:19,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:41:20,035 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:41:20,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:41:20,459 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:41:20,459 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:41:20,460 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [309295780] [2021-11-12 22:41:20,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [309295780] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:41:20,460 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [586928915] [2021-11-12 22:41:20,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:41:20,460 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:41:20,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:41:20,461 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:41:20,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (81)] Waiting until timeout for monitored process [2021-11-12 22:41:20,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:41:20,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-12 22:41:20,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:41:20,875 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:41:20,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:41:21,073 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:41:21,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [586928915] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:41:21,073 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1710689680] [2021-11-12 22:41:21,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:41:21,073 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:41:21,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:41:21,074 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:41:21,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-12 22:41:21,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:41:21,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-12 22:41:21,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:41:21,475 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:41:21,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:41:21,676 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:41:21,676 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1710689680] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:41:21,676 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:41:21,677 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 11, 10, 11, 10] total 19 [2021-11-12 22:41:21,677 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759907557] [2021-11-12 22:41:21,677 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:41:21,677 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-12 22:41:21,677 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:41:21,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-12 22:41:21,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2021-11-12 22:41:21,678 INFO L87 Difference]: Start difference. First operand 738 states and 962 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) [2021-11-12 22:41:22,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:41:22,311 INFO L93 Difference]: Finished difference Result 820 states and 1045 transitions. [2021-11-12 22:41:22,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-12 22:41:22,312 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 [2021-11-12 22:41:22,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:41:22,314 INFO L225 Difference]: With dead ends: 820 [2021-11-12 22:41:22,314 INFO L226 Difference]: Without dead ends: 747 [2021-11-12 22:41:22,315 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 [2021-11-12 22:41:22,315 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 306 mSDsluCounter, 386 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 277.46ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 306 SdHoareTripleChecker+Valid, 436 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.38ms SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 321.18ms IncrementalHoareTripleChecker+Time [2021-11-12 22:41:22,315 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [306 Valid, 436 Invalid, 252 Unknown, 0 Unchecked, 1.38ms Time], IncrementalHoareTripleChecker [25 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 321.18ms Time] [2021-11-12 22:41:22,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 747 states. [2021-11-12 22:41:22,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 747 to 711. [2021-11-12 22:41:22,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 711 states, 706 states have (on average 1.3059490084985836) internal successors, (922), 710 states have internal predecessors, (922), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:41:22,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 711 states to 711 states and 922 transitions. [2021-11-12 22:41:22,328 INFO L78 Accepts]: Start accepts. Automaton has 711 states and 922 transitions. Word has length 43 [2021-11-12 22:41:22,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:41:22,328 INFO L470 AbstractCegarLoop]: Abstraction has 711 states and 922 transitions. [2021-11-12 22:41:22,328 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) [2021-11-12 22:41:22,328 INFO L276 IsEmpty]: Start isEmpty. Operand 711 states and 922 transitions. [2021-11-12 22:41:22,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-12 22:41:22,330 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:41:22,330 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] [2021-11-12 22:41:22,360 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Ended with exit code 0 [2021-11-12 22:41:22,565 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (80)] Ended with exit code 0 [2021-11-12 22:41:22,754 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (81)] Ended with exit code 0 [2021-11-12 22:41:22,953 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:41:22,953 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:41:22,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:41:22,954 INFO L85 PathProgramCache]: Analyzing trace with hash -2013885157, now seen corresponding path program 1 times [2021-11-12 22:41:22,954 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:41:22,954 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2018875152] [2021-11-12 22:41:22,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:41:22,954 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:41:22,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:41:22,955 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:41:22,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (83)] Waiting until timeout for monitored process [2021-11-12 22:41:23,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:41:23,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-12 22:41:23,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:41:23,329 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 9 proven. 9 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:41:23,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:41:23,919 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 [2021-11-12 22:41:24,323 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:41:24,323 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:41:24,323 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2018875152] [2021-11-12 22:41:24,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2018875152] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:41:24,324 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1616175422] [2021-11-12 22:41:24,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:41:24,324 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:41:24,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:41:24,324 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:41:24,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (84)] Waiting until timeout for monitored process [2021-11-12 22:41:24,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:41:24,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-12 22:41:24,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:41:25,032 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 10 proven. 7 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-12 22:41:25,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:41:25,765 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 10 proven. 7 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-12 22:41:25,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1616175422] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:41:25,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1221092478] [2021-11-12 22:41:25,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:41:25,765 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:41:25,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:41:25,766 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:41:25,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-12 22:41:25,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:41:25,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-12 22:41:25,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:41:26,329 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-12 22:41:26,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:41:26,819 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-12 22:41:26,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1221092478] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:41:26,819 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:41:26,819 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 12, 11, 9, 7] total 45 [2021-11-12 22:41:26,819 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301055728] [2021-11-12 22:41:26,820 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:41:26,820 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-12 22:41:26,820 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:41:26,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-12 22:41:26,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=1803, Unknown=0, NotChecked=0, Total=1980 [2021-11-12 22:41:26,821 INFO L87 Difference]: Start difference. First operand 711 states and 922 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) [2021-11-12 22:41:35,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:41:35,154 INFO L93 Difference]: Finished difference Result 1557 states and 1819 transitions. [2021-11-12 22:41:35,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-12 22:41:35,155 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 [2021-11-12 22:41:35,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:41:35,160 INFO L225 Difference]: With dead ends: 1557 [2021-11-12 22:41:35,160 INFO L226 Difference]: Without dead ends: 1492 [2021-11-12 22:41:35,162 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2236 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=1504, Invalid=7808, Unknown=0, NotChecked=0, Total=9312 [2021-11-12 22:41:35,162 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 1483 mSDsluCounter, 750 mSDsCounter, 0 mSdLazyCounter, 1343 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2087.28ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1483 SdHoareTripleChecker+Valid, 795 SdHoareTripleChecker+Invalid, 1522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.09ms SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 1343 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2368.59ms IncrementalHoareTripleChecker+Time [2021-11-12 22:41:35,163 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1483 Valid, 795 Invalid, 1522 Unknown, 0 Unchecked, 7.09ms Time], IncrementalHoareTripleChecker [179 Valid, 1343 Invalid, 0 Unknown, 0 Unchecked, 2368.59ms Time] [2021-11-12 22:41:35,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1492 states. [2021-11-12 22:41:35,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1492 to 729. [2021-11-12 22:41:35,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 729 states, 724 states have (on average 1.212707182320442) internal successors, (878), 728 states have internal predecessors, (878), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:41:35,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 729 states to 729 states and 878 transitions. [2021-11-12 22:41:35,178 INFO L78 Accepts]: Start accepts. Automaton has 729 states and 878 transitions. Word has length 44 [2021-11-12 22:41:35,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:41:35,179 INFO L470 AbstractCegarLoop]: Abstraction has 729 states and 878 transitions. [2021-11-12 22:41:35,179 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) [2021-11-12 22:41:35,179 INFO L276 IsEmpty]: Start isEmpty. Operand 729 states and 878 transitions. [2021-11-12 22:41:35,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-12 22:41:35,180 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:41:35,180 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] [2021-11-12 22:41:35,197 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (83)] Ended with exit code 0 [2021-11-12 22:41:35,394 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (84)] Ended with exit code 0 [2021-11-12 22:41:35,614 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Ended with exit code 0 [2021-11-12 22:41:35,793 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:41:35,793 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:41:35,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:41:35,793 INFO L85 PathProgramCache]: Analyzing trace with hash 1937706185, now seen corresponding path program 2 times [2021-11-12 22:41:35,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:41:35,794 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [662750261] [2021-11-12 22:41:35,794 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:41:35,794 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:41:35,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:41:35,795 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:41:35,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (86)] Waiting until timeout for monitored process [2021-11-12 22:41:35,900 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:41:35,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:41:35,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-12 22:41:35,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:41:36,289 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:41:36,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:41:37,743 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 [2021-11-12 22:41:38,330 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:41:38,330 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:41:38,331 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [662750261] [2021-11-12 22:41:38,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [662750261] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:41:38,331 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [149847787] [2021-11-12 22:41:38,331 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:41:38,331 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:41:38,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:41:38,333 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:41:38,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (87)] Waiting until timeout for monitored process [2021-11-12 22:41:38,496 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:41:38,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:41:38,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-12 22:41:38,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:41:38,620 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-12 22:41:38,620 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 [2021-11-12 22:41:38,626 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:41:38,627 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 [2021-11-12 22:41:43,726 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:41:43,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:41:46,553 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:41:46,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 75 treesize of output 1 [2021-11-12 22:41:46,559 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:41:46,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [149847787] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:41:46,559 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1337082553] [2021-11-12 22:41:46,560 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:41:46,560 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:41:46,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:41:46,564 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:41:46,564 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-12 22:41:46,636 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:41:46,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:41:46,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-12 22:41:46,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:41:47,075 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:41:47,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:41:47,900 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 [2021-11-12 22:41:48,043 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:41:48,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1337082553] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:41:48,043 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:41:48,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 12, 11, 8, 9] total 35 [2021-11-12 22:41:48,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774726997] [2021-11-12 22:41:48,044 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:41:48,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-12 22:41:48,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:41:48,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-12 22:41:48,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1077, Unknown=0, NotChecked=0, Total=1260 [2021-11-12 22:41:48,046 INFO L87 Difference]: Start difference. First operand 729 states and 878 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) [2021-11-12 22:41:54,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:41:54,949 INFO L93 Difference]: Finished difference Result 1411 states and 1678 transitions. [2021-11-12 22:41:54,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-12 22:41:54,951 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 [2021-11-12 22:41:54,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:41:54,956 INFO L225 Difference]: With dead ends: 1411 [2021-11-12 22:41:54,956 INFO L226 Difference]: Without dead ends: 1411 [2021-11-12 22:41:54,957 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 245 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 642 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=331, Invalid=2119, Unknown=0, NotChecked=0, Total=2450 [2021-11-12 22:41:54,957 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 113 mSDsluCounter, 580 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 886.65ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 626 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.60ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 962.86ms IncrementalHoareTripleChecker+Time [2021-11-12 22:41:54,957 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 626 Invalid, 231 Unknown, 0 Unchecked, 1.60ms Time], IncrementalHoareTripleChecker [1 Valid, 149 Invalid, 0 Unknown, 81 Unchecked, 962.86ms Time] [2021-11-12 22:41:54,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1411 states. [2021-11-12 22:41:54,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1411 to 1239. [2021-11-12 22:41:54,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1239 states, 1234 states have (on average 1.2106969205834683) internal successors, (1494), 1238 states have internal predecessors, (1494), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:41:54,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1239 states to 1239 states and 1494 transitions. [2021-11-12 22:41:54,979 INFO L78 Accepts]: Start accepts. Automaton has 1239 states and 1494 transitions. Word has length 47 [2021-11-12 22:41:54,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:41:54,979 INFO L470 AbstractCegarLoop]: Abstraction has 1239 states and 1494 transitions. [2021-11-12 22:41:54,980 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) [2021-11-12 22:41:54,980 INFO L276 IsEmpty]: Start isEmpty. Operand 1239 states and 1494 transitions. [2021-11-12 22:41:54,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-12 22:41:54,981 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:41:54,982 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] [2021-11-12 22:41:54,984 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (87)] Ended with exit code 0 [2021-11-12 22:41:55,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Forceful destruction successful, exit code 0 [2021-11-12 22:41:55,391 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (86)] Ended with exit code 0 [2021-11-12 22:41:55,584 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:41:55,584 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:41:55,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:41:55,585 INFO L85 PathProgramCache]: Analyzing trace with hash 420978799, now seen corresponding path program 3 times [2021-11-12 22:41:55,585 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:41:55,585 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [500930301] [2021-11-12 22:41:55,585 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:41:55,585 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:41:55,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:41:55,586 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:41:55,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (89)] Waiting until timeout for monitored process [2021-11-12 22:41:55,854 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-12 22:41:55,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:41:55,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-12 22:41:55,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:41:56,278 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:41:56,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:41:57,638 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 [2021-11-12 22:41:58,209 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:41:58,209 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:41:58,210 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [500930301] [2021-11-12 22:41:58,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [500930301] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:41:58,210 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [813310939] [2021-11-12 22:41:58,210 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:41:58,210 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:41:58,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:41:58,211 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:41:58,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (90)] Waiting until timeout for monitored process [2021-11-12 22:41:58,973 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-12 22:41:58,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:41:58,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-12 22:41:58,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:41:59,149 INFO L354 Elim1Store]: treesize reduction 48, result has 21.3 percent of original size [2021-11-12 22:41:59,149 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 [2021-11-12 22:41:59,155 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:41:59,155 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 [2021-11-12 22:42:02,045 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:42:02,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:42:08,996 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 33 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:42:08,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [813310939] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:42:08,997 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1175861596] [2021-11-12 22:42:08,997 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 22:42:08,997 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:42:08,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:42:08,998 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:42:08,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-12 22:42:09,189 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-12 22:42:09,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:42:09,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-12 22:42:09,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:42:09,259 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-12 22:42:09,260 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 [2021-11-12 22:42:09,266 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:42:09,266 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 [2021-11-12 22:42:18,810 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:42:18,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:42:21,688 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:42:21,688 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 129 treesize of output 1 [2021-11-12 22:42:21,695 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:42:21,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1175861596] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:42:21,696 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:42:21,696 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 12, 12, 11, 11] total 50 [2021-11-12 22:42:21,696 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692089343] [2021-11-12 22:42:21,696 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:42:21,696 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-12 22:42:21,696 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:42:21,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-12 22:42:21,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=389, Invalid=2160, Unknown=1, NotChecked=0, Total=2550 [2021-11-12 22:42:21,698 INFO L87 Difference]: Start difference. First operand 1239 states and 1494 transitions. Second operand has 51 states, 50 states have (on average 4.62) internal successors, (231), 51 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) [2021-11-12 22:42:33,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:42:33,925 INFO L93 Difference]: Finished difference Result 1690 states and 2002 transitions. [2021-11-12 22:42:33,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-12 22:42:33,927 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 4.62) internal successors, (231), 51 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) Word has length 47 [2021-11-12 22:42:33,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:42:33,933 INFO L225 Difference]: With dead ends: 1690 [2021-11-12 22:42:33,933 INFO L226 Difference]: Without dead ends: 1690 [2021-11-12 22:42:33,935 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 235 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1655 ImplicationChecksByTransitivity, 23.6s TimeCoverageRelationStatistics Valid=848, Invalid=4120, Unknown=2, NotChecked=0, Total=4970 [2021-11-12 22:42:33,935 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 311 mSDsluCounter, 691 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1857.59ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 311 SdHoareTripleChecker+Valid, 736 SdHoareTripleChecker+Invalid, 642 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.59ms SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 379 IncrementalHoareTripleChecker+Unchecked, 2007.72ms IncrementalHoareTripleChecker+Time [2021-11-12 22:42:33,935 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [311 Valid, 736 Invalid, 642 Unknown, 0 Unchecked, 2.59ms Time], IncrementalHoareTripleChecker [11 Valid, 252 Invalid, 0 Unknown, 379 Unchecked, 2007.72ms Time] [2021-11-12 22:42:33,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1690 states. [2021-11-12 22:42:33,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1690 to 1511. [2021-11-12 22:42:33,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1511 states, 1506 states have (on average 1.2124833997343958) internal successors, (1826), 1510 states have internal predecessors, (1826), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:42:33,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1511 states to 1511 states and 1826 transitions. [2021-11-12 22:42:33,957 INFO L78 Accepts]: Start accepts. Automaton has 1511 states and 1826 transitions. Word has length 47 [2021-11-12 22:42:33,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:42:33,958 INFO L470 AbstractCegarLoop]: Abstraction has 1511 states and 1826 transitions. [2021-11-12 22:42:33,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 50 states have (on average 4.62) internal successors, (231), 51 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) [2021-11-12 22:42:33,958 INFO L276 IsEmpty]: Start isEmpty. Operand 1511 states and 1826 transitions. [2021-11-12 22:42:33,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-12 22:42:33,960 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:42:33,960 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] [2021-11-12 22:42:33,978 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (90)] Ended with exit code 0 [2021-11-12 22:42:34,199 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Ended with exit code 0 [2021-11-12 22:42:34,388 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (89)] Forceful destruction successful, exit code 0 [2021-11-12 22:42:34,579 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:42:34,579 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:42:34,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:42:34,579 INFO L85 PathProgramCache]: Analyzing trace with hash -240796018, now seen corresponding path program 4 times [2021-11-12 22:42:34,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:42:34,580 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [865253146] [2021-11-12 22:42:34,580 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:42:34,580 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:42:34,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:42:34,581 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:42:34,581 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (92)] Waiting until timeout for monitored process [2021-11-12 22:42:34,704 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:42:34,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:42:34,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-12 22:42:34,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:42:35,062 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 25 proven. 43 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:42:35,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:42:35,569 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 25 proven. 43 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:42:35,569 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:42:35,570 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [865253146] [2021-11-12 22:42:35,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [865253146] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:42:35,570 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1119676109] [2021-11-12 22:42:35,570 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:42:35,570 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:42:35,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:42:35,571 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:42:35,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (93)] Waiting until timeout for monitored process [2021-11-12 22:42:35,721 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:42:35,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:42:35,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-12 22:42:35,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:42:35,922 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 32 proven. 30 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-12 22:42:35,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:42:36,321 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 32 proven. 30 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-12 22:42:36,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1119676109] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:42:36,322 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [367681282] [2021-11-12 22:42:36,322 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:42:36,322 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:42:36,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:42:36,323 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:42:36,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2021-11-12 22:42:36,397 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:42:36,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:42:36,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-12 22:42:36,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:42:36,623 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 32 proven. 30 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-12 22:42:36,623 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:42:36,794 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 32 proven. 30 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-12 22:42:36,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [367681282] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:42:36,795 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:42:36,795 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13, 12, 13, 12] total 31 [2021-11-12 22:42:36,795 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159381128] [2021-11-12 22:42:36,795 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:42:36,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-12 22:42:36,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:42:36,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-12 22:42:36,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=779, Unknown=0, NotChecked=0, Total=930 [2021-11-12 22:42:36,797 INFO L87 Difference]: Start difference. First operand 1511 states and 1826 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) [2021-11-12 22:42:38,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:42:38,975 INFO L93 Difference]: Finished difference Result 3119 states and 3693 transitions. [2021-11-12 22:42:38,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-12 22:42:38,976 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 [2021-11-12 22:42:38,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:42:38,986 INFO L225 Difference]: With dead ends: 3119 [2021-11-12 22:42:38,987 INFO L226 Difference]: Without dead ends: 3081 [2021-11-12 22:42:38,987 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 259 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 716 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=766, Invalid=2656, Unknown=0, NotChecked=0, Total=3422 [2021-11-12 22:42:38,988 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 707 mSDsluCounter, 1075 mSDsCounter, 0 mSdLazyCounter, 836 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 962.76ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 707 SdHoareTripleChecker+Valid, 1161 SdHoareTripleChecker+Invalid, 904 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.08ms SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 836 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1114.72ms IncrementalHoareTripleChecker+Time [2021-11-12 22:42:38,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [707 Valid, 1161 Invalid, 904 Unknown, 0 Unchecked, 4.08ms Time], IncrementalHoareTripleChecker [68 Valid, 836 Invalid, 0 Unknown, 0 Unchecked, 1114.72ms Time] [2021-11-12 22:42:38,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3081 states. [2021-11-12 22:42:39,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3081 to 2417. [2021-11-12 22:42:39,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2417 states, 2412 states have (on average 1.2450248756218905) internal successors, (3003), 2416 states have internal predecessors, (3003), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:42:39,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2417 states to 2417 states and 3003 transitions. [2021-11-12 22:42:39,030 INFO L78 Accepts]: Start accepts. Automaton has 2417 states and 3003 transitions. Word has length 49 [2021-11-12 22:42:39,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:42:39,030 INFO L470 AbstractCegarLoop]: Abstraction has 2417 states and 3003 transitions. [2021-11-12 22:42:39,030 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) [2021-11-12 22:42:39,030 INFO L276 IsEmpty]: Start isEmpty. Operand 2417 states and 3003 transitions. [2021-11-12 22:42:39,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-12 22:42:39,032 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:42:39,032 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:42:39,045 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (92)] Ended with exit code 0 [2021-11-12 22:42:39,247 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (93)] Forceful destruction successful, exit code 0 [2021-11-12 22:42:39,466 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Ended with exit code 0 [2021-11-12 22:42:39,646 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:42:39,646 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:42:39,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:42:39,646 INFO L85 PathProgramCache]: Analyzing trace with hash -1908687442, now seen corresponding path program 1 times [2021-11-12 22:42:39,646 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:42:39,646 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [895365837] [2021-11-12 22:42:39,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:42:39,646 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:42:39,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:42:39,647 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:42:39,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (95)] Waiting until timeout for monitored process [2021-11-12 22:42:39,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:42:39,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-12 22:42:39,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:42:40,088 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 14 proven. 25 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:42:40,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:42:41,251 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 [2021-11-12 22:42:41,893 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:42:41,893 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:42:41,893 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [895365837] [2021-11-12 22:42:41,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [895365837] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:42:41,893 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [292517901] [2021-11-12 22:42:41,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:42:41,893 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:42:41,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:42:41,894 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:42:41,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (96)] Waiting until timeout for monitored process [2021-11-12 22:42:42,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:42:42,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-12 22:42:42,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:42:42,317 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 14 proven. 25 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:42:42,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:42:42,839 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 [2021-11-12 22:42:43,007 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:42:43,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [292517901] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:42:43,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1326332154] [2021-11-12 22:42:43,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:42:43,007 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:42:43,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:42:43,008 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:42:43,009 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2021-11-12 22:42:43,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:42:43,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-12 22:42:43,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:42:43,191 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-12 22:42:43,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 32 treesize of output 39 [2021-11-12 22:42:43,194 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 [2021-11-12 22:42:57,191 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 14 proven. 25 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:42:57,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:42:59,536 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 [2021-11-12 22:42:59,546 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:42:59,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1326332154] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:42:59,547 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:42:59,547 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 10, 11, 13, 13] total 38 [2021-11-12 22:42:59,547 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474826987] [2021-11-12 22:42:59,547 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:42:59,547 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-12 22:42:59,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:42:59,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-12 22:42:59,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=1256, Unknown=0, NotChecked=0, Total=1482 [2021-11-12 22:42:59,548 INFO L87 Difference]: Start difference. First operand 2417 states and 3003 transitions. Second operand has 39 states, 38 states have (on average 3.8947368421052633) internal successors, (148), 39 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) [2021-11-12 22:43:13,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:43:13,412 INFO L93 Difference]: Finished difference Result 3391 states and 4074 transitions. [2021-11-12 22:43:13,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-12 22:43:13,414 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 3.8947368421052633) internal successors, (148), 39 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) Word has length 49 [2021-11-12 22:43:13,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:43:13,425 INFO L225 Difference]: With dead ends: 3391 [2021-11-12 22:43:13,426 INFO L226 Difference]: Without dead ends: 3363 [2021-11-12 22:43:13,426 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 259 SyntacticMatches, 5 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1613 ImplicationChecksByTransitivity, 27.3s TimeCoverageRelationStatistics Valid=654, Invalid=3636, Unknown=0, NotChecked=0, Total=4290 [2021-11-12 22:43:13,426 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 219 mSDsluCounter, 529 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1717.17ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 564 SdHoareTripleChecker+Invalid, 470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.25ms SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 158 IncrementalHoareTripleChecker+Unchecked, 1848.44ms IncrementalHoareTripleChecker+Time [2021-11-12 22:43:13,426 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [219 Valid, 564 Invalid, 470 Unknown, 0 Unchecked, 2.25ms Time], IncrementalHoareTripleChecker [12 Valid, 300 Invalid, 0 Unknown, 158 Unchecked, 1848.44ms Time] [2021-11-12 22:43:13,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3363 states. [2021-11-12 22:43:13,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3363 to 2917. [2021-11-12 22:43:13,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2917 states, 2912 states have (on average 1.231456043956044) internal successors, (3586), 2916 states have internal predecessors, (3586), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:43:13,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2917 states to 2917 states and 3586 transitions. [2021-11-12 22:43:13,467 INFO L78 Accepts]: Start accepts. Automaton has 2917 states and 3586 transitions. Word has length 49 [2021-11-12 22:43:13,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:43:13,467 INFO L470 AbstractCegarLoop]: Abstraction has 2917 states and 3586 transitions. [2021-11-12 22:43:13,467 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 3.8947368421052633) internal successors, (148), 39 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) [2021-11-12 22:43:13,467 INFO L276 IsEmpty]: Start isEmpty. Operand 2917 states and 3586 transitions. [2021-11-12 22:43:13,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-12 22:43:13,469 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:43:13,469 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] [2021-11-12 22:43:13,523 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Ended with exit code 0 [2021-11-12 22:43:13,688 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (96)] Ended with exit code 0 [2021-11-12 22:43:13,893 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (95)] Ended with exit code 0 [2021-11-12 22:43:14,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:43:14,086 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:43:14,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:43:14,086 INFO L85 PathProgramCache]: Analyzing trace with hash -722595117, now seen corresponding path program 2 times [2021-11-12 22:43:14,087 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:43:14,087 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [449543097] [2021-11-12 22:43:14,087 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:43:14,087 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:43:14,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:43:14,088 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:43:14,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (98)] Waiting until timeout for monitored process [2021-11-12 22:43:14,193 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:43:14,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:43:14,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-12 22:43:14,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:43:14,601 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:43:14,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:43:16,005 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 [2021-11-12 22:43:16,536 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 1 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:43:16,536 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:43:16,536 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [449543097] [2021-11-12 22:43:16,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [449543097] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:43:16,536 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [351514950] [2021-11-12 22:43:16,537 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:43:16,537 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:43:16,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:43:16,542 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:43:16,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (99)] Waiting until timeout for monitored process [2021-11-12 22:43:16,707 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:43:16,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:43:16,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-12 22:43:16,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:43:16,812 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-12 22:43:16,813 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 [2021-11-12 22:43:16,819 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:43:16,819 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 [2021-11-12 22:43:21,423 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:43:21,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:43:24,070 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:43:24,070 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 [2021-11-12 22:43:24,077 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:43:24,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [351514950] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:43:24,077 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534106557] [2021-11-12 22:43:24,077 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:43:24,078 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:43:24,078 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:43:24,078 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:43:24,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2021-11-12 22:43:24,155 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:43:24,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:43:24,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-12 22:43:24,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:43:24,216 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-12 22:43:24,216 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 [2021-11-12 22:43:24,221 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:43:24,221 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 [2021-11-12 22:43:30,928 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-12 22:43:30,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:43:33,439 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:43:33,439 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 1 [2021-11-12 22:43:33,446 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 1 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-12 22:43:33,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1534106557] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:43:33,446 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:43:33,447 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 12, 11, 11, 11] total 43 [2021-11-12 22:43:33,447 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512822107] [2021-11-12 22:43:33,447 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:43:33,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-12 22:43:33,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:43:33,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-12 22:43:33,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=1606, Unknown=1, NotChecked=0, Total=1892 [2021-11-12 22:43:33,448 INFO L87 Difference]: Start difference. First operand 2917 states and 3586 transitions. Second operand has 44 states, 43 states have (on average 5.046511627906977) internal successors, (217), 44 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:43:40,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:43:40,966 INFO L93 Difference]: Finished difference Result 3534 states and 4270 transitions. [2021-11-12 22:43:40,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-12 22:43:40,968 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 5.046511627906977) internal successors, (217), 44 states have internal predecessors, (217), 0 states have call successors, (0), 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 [2021-11-12 22:43:40,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:43:40,980 INFO L225 Difference]: With dead ends: 3534 [2021-11-12 22:43:40,980 INFO L226 Difference]: Without dead ends: 3534 [2021-11-12 22:43:40,980 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 253 SyntacticMatches, 4 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1091 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=525, Invalid=2666, Unknown=1, NotChecked=0, Total=3192 [2021-11-12 22:43:40,981 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 192 mSDsluCounter, 468 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1104.16ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 503 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.57ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 80 IncrementalHoareTripleChecker+Unchecked, 1200.96ms IncrementalHoareTripleChecker+Time [2021-11-12 22:43:40,981 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [192 Valid, 503 Invalid, 259 Unknown, 0 Unchecked, 1.57ms Time], IncrementalHoareTripleChecker [5 Valid, 174 Invalid, 0 Unknown, 80 Unchecked, 1200.96ms Time] [2021-11-12 22:43:40,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3534 states. [2021-11-12 22:43:41,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3534 to 2766. [2021-11-12 22:43:41,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2766 states, 2761 states have (on average 1.2238319449474828) internal successors, (3379), 2765 states have internal predecessors, (3379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:43:41,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2766 states to 2766 states and 3379 transitions. [2021-11-12 22:43:41,026 INFO L78 Accepts]: Start accepts. Automaton has 2766 states and 3379 transitions. Word has length 50 [2021-11-12 22:43:41,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:43:41,027 INFO L470 AbstractCegarLoop]: Abstraction has 2766 states and 3379 transitions. [2021-11-12 22:43:41,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 5.046511627906977) internal successors, (217), 44 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:43:41,027 INFO L276 IsEmpty]: Start isEmpty. Operand 2766 states and 3379 transitions. [2021-11-12 22:43:41,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-12 22:43:41,029 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:43:41,030 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:43:41,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Forceful destruction successful, exit code 0 [2021-11-12 22:43:41,251 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (98)] Ended with exit code 0 [2021-11-12 22:43:41,445 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (99)] Ended with exit code 0 [2021-11-12 22:43:41,643 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:43:41,644 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:43:41,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:43:41,644 INFO L85 PathProgramCache]: Analyzing trace with hash 806102886, now seen corresponding path program 4 times [2021-11-12 22:43:41,644 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:43:41,644 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [840657846] [2021-11-12 22:43:41,645 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:43:41,645 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:43:41,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:43:41,646 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:43:41,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (101)] Waiting until timeout for monitored process [2021-11-12 22:43:41,757 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:43:41,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:43:41,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-12 22:43:41,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:43:42,277 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:43:42,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:43:42,951 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:43:42,951 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:43:42,951 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [840657846] [2021-11-12 22:43:42,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [840657846] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:43:42,952 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [548337538] [2021-11-12 22:43:42,952 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:43:42,952 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:43:42,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:43:42,953 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:43:42,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (102)] Waiting until timeout for monitored process [2021-11-12 22:43:43,119 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:43:43,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:43:43,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-12 22:43:43,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:43:43,676 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:43:43,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:43:44,027 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:43:44,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [548337538] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:43:44,028 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [388416758] [2021-11-12 22:43:44,028 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-12 22:43:44,028 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:43:44,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:43:44,029 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:43:44,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2021-11-12 22:43:44,106 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-12 22:43:44,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:43:44,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-12 22:43:44,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:43:44,475 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:43:44,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:43:44,763 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:43:44,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [388416758] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:43:44,763 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:43:44,763 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 12, 11, 13, 12] total 33 [2021-11-12 22:43:44,763 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078285066] [2021-11-12 22:43:44,763 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:43:44,764 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-12 22:43:44,764 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:43:44,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-12 22:43:44,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=899, Unknown=0, NotChecked=0, Total=1056 [2021-11-12 22:43:44,764 INFO L87 Difference]: Start difference. First operand 2766 states and 3379 transitions. Second operand has 33 states, 33 states have (on average 4.878787878787879) internal successors, (161), 33 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:43:45,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:43:45,965 INFO L93 Difference]: Finished difference Result 2614 states and 3135 transitions. [2021-11-12 22:43:45,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-12 22:43:45,966 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 4.878787878787879) internal successors, (161), 33 states have internal predecessors, (161), 0 states have call successors, (0), 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 55 [2021-11-12 22:43:45,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:43:45,974 INFO L225 Difference]: With dead ends: 2614 [2021-11-12 22:43:45,974 INFO L226 Difference]: Without dead ends: 2401 [2021-11-12 22:43:45,974 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 292 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 492 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=390, Invalid=1680, Unknown=0, NotChecked=0, Total=2070 [2021-11-12 22:43:45,975 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 564 mSDsluCounter, 1044 mSDsCounter, 0 mSdLazyCounter, 592 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 579.56ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 564 SdHoareTripleChecker+Valid, 1125 SdHoareTripleChecker+Invalid, 640 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.03ms SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 592 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 681.66ms IncrementalHoareTripleChecker+Time [2021-11-12 22:43:45,975 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [564 Valid, 1125 Invalid, 640 Unknown, 0 Unchecked, 3.03ms Time], IncrementalHoareTripleChecker [48 Valid, 592 Invalid, 0 Unknown, 0 Unchecked, 681.66ms Time] [2021-11-12 22:43:45,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2401 states. [2021-11-12 22:43:46,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2401 to 2180. [2021-11-12 22:43:46,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2180 states, 2175 states have (on average 1.214712643678161) internal successors, (2642), 2179 states have internal predecessors, (2642), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:43:46,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2180 states to 2180 states and 2642 transitions. [2021-11-12 22:43:46,012 INFO L78 Accepts]: Start accepts. Automaton has 2180 states and 2642 transitions. Word has length 55 [2021-11-12 22:43:46,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:43:46,012 INFO L470 AbstractCegarLoop]: Abstraction has 2180 states and 2642 transitions. [2021-11-12 22:43:46,013 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 4.878787878787879) internal successors, (161), 33 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:43:46,013 INFO L276 IsEmpty]: Start isEmpty. Operand 2180 states and 2642 transitions. [2021-11-12 22:43:46,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-12 22:43:46,015 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:43:46,015 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] [2021-11-12 22:43:46,040 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (101)] Ended with exit code 0 [2021-11-12 22:43:46,249 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Ended with exit code 0 [2021-11-12 22:43:46,430 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (102)] Ended with exit code 0 [2021-11-12 22:43:46,628 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:43:46,628 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:43:46,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:43:46,629 INFO L85 PathProgramCache]: Analyzing trace with hash -878193103, now seen corresponding path program 2 times [2021-11-12 22:43:46,629 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:43:46,629 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1406944359] [2021-11-12 22:43:46,629 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:43:46,630 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:43:46,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:43:46,630 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:43:46,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (104)] Waiting until timeout for monitored process [2021-11-12 22:43:46,760 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:43:46,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:43:46,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-12 22:43:46,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:43:46,841 INFO L354 Elim1Store]: treesize reduction 42, result has 35.4 percent of original size [2021-11-12 22:43:46,841 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 [2021-11-12 22:43:47,801 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:43:47,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:43:50,232 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 9 proven. 41 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:43:50,232 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:43:50,232 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1406944359] [2021-11-12 22:43:50,233 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1406944359] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:43:50,233 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [619093277] [2021-11-12 22:43:50,233 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:43:50,233 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:43:50,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:43:50,235 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:43:50,236 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (105)] Waiting until timeout for monitored process [2021-11-12 22:43:50,508 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:43:50,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:43:50,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-12 22:43:50,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:43:50,568 INFO L354 Elim1Store]: treesize reduction 50, result has 23.1 percent of original size [2021-11-12 22:43:50,581 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 [2021-11-12 22:43:50,595 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-12 22:43:50,595 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 [2021-11-12 22:44:05,469 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:44:05,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:44:08,344 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:44:08,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [619093277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:44:08,345 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610819974] [2021-11-12 22:44:08,345 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:44:08,345 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:44:08,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:44:08,346 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:44:08,347 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2021-11-12 22:44:08,428 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:44:08,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:44:08,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-12 22:44:08,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:44:08,502 INFO L354 Elim1Store]: treesize reduction 42, result has 35.4 percent of original size [2021-11-12 22:44:08,503 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 [2021-11-12 22:44:09,963 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:44:09,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:44:12,529 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:44:12,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1610819974] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:44:12,530 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:44:12,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 12, 11, 11, 11] total 47 [2021-11-12 22:44:12,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460635192] [2021-11-12 22:44:12,530 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:44:12,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-12 22:44:12,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:44:12,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-12 22:44:12,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=1878, Unknown=0, NotChecked=0, Total=2256 [2021-11-12 22:44:12,531 INFO L87 Difference]: Start difference. First operand 2180 states and 2642 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) [2021-11-12 22:44:14,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:44:14,804 INFO L93 Difference]: Finished difference Result 3401 states and 4107 transitions. [2021-11-12 22:44:14,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-12 22:44:14,806 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 [2021-11-12 22:44:14,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:44:14,820 INFO L225 Difference]: With dead ends: 3401 [2021-11-12 22:44:14,821 INFO L226 Difference]: Without dead ends: 3327 [2021-11-12 22:44:14,821 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 285 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1179 ImplicationChecksByTransitivity, 17.0s TimeCoverageRelationStatistics Valid=521, Invalid=2341, Unknown=0, NotChecked=0, Total=2862 [2021-11-12 22:44:14,822 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 177 mSDsluCounter, 804 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 821.29ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 849 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.81ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 114 IncrementalHoareTripleChecker+Unchecked, 898.00ms IncrementalHoareTripleChecker+Time [2021-11-12 22:44:14,822 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [177 Valid, 849 Invalid, 272 Unknown, 0 Unchecked, 1.81ms Time], IncrementalHoareTripleChecker [3 Valid, 155 Invalid, 0 Unknown, 114 Unchecked, 898.00ms Time] [2021-11-12 22:44:14,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3327 states. [2021-11-12 22:44:14,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3327 to 2117. [2021-11-12 22:44:14,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2117 states, 2112 states have (on average 1.2230113636363635) internal successors, (2583), 2116 states have internal predecessors, (2583), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:44:14,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2117 states to 2117 states and 2583 transitions. [2021-11-12 22:44:14,849 INFO L78 Accepts]: Start accepts. Automaton has 2117 states and 2583 transitions. Word has length 56 [2021-11-12 22:44:14,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:44:14,849 INFO L470 AbstractCegarLoop]: Abstraction has 2117 states and 2583 transitions. [2021-11-12 22:44:14,849 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) [2021-11-12 22:44:14,850 INFO L276 IsEmpty]: Start isEmpty. Operand 2117 states and 2583 transitions. [2021-11-12 22:44:14,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-12 22:44:14,851 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:44:14,852 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:44:14,882 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (104)] Forceful destruction successful, exit code 0 [2021-11-12 22:44:15,072 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (105)] Ended with exit code 0 [2021-11-12 22:44:15,287 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Ended with exit code 0 [2021-11-12 22:44:15,466 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:44:15,466 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:44:15,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:44:15,467 INFO L85 PathProgramCache]: Analyzing trace with hash 1717787640, now seen corresponding path program 2 times [2021-11-12 22:44:15,467 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:44:15,467 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [586009421] [2021-11-12 22:44:15,467 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:44:15,467 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:44:15,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:44:15,472 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:44:15,472 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (107)] Waiting until timeout for monitored process [2021-11-12 22:44:15,612 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:44:15,613 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:44:15,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-12 22:44:15,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:44:16,005 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 5 proven. 44 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-12 22:44:16,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:44:17,318 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 [2021-11-12 22:44:18,036 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 4 proven. 53 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-12 22:44:18,036 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:44:18,036 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [586009421] [2021-11-12 22:44:18,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [586009421] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:44:18,037 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1701970828] [2021-11-12 22:44:18,037 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:44:18,037 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:44:18,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:44:18,037 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:44:18,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (108)] Waiting until timeout for monitored process [2021-11-12 22:44:18,233 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:44:18,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:44:18,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-12 22:44:18,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:44:19,241 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-12 22:44:19,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:44:20,739 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-12 22:44:20,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1701970828] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:44:20,740 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [498345445] [2021-11-12 22:44:20,740 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:44:20,740 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:44:20,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:44:20,765 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:44:20,766 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2021-11-12 22:44:20,885 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:44:20,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:44:20,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-12 22:44:20,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:44:21,748 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 9 proven. 33 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-12 22:44:21,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:44:22,665 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 9 proven. 33 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-12 22:44:22,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [498345445] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:44:22,665 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:44:22,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 15, 14, 11, 9] total 62 [2021-11-12 22:44:22,665 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568130169] [2021-11-12 22:44:22,666 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:44:22,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-12 22:44:22,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:44:22,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-12 22:44:22,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=3495, Unknown=0, NotChecked=0, Total=3782 [2021-11-12 22:44:22,667 INFO L87 Difference]: Start difference. First operand 2117 states and 2583 transitions. Second operand has 62 states, 62 states have (on average 3.725806451612903) internal successors, (231), 62 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) [2021-11-12 22:44:43,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:44:43,198 INFO L93 Difference]: Finished difference Result 4227 states and 4898 transitions. [2021-11-12 22:44:43,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-11-12 22:44:43,200 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 3.725806451612903) internal successors, (231), 62 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) Word has length 56 [2021-11-12 22:44:43,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:44:43,205 INFO L225 Difference]: With dead ends: 4227 [2021-11-12 22:44:43,206 INFO L226 Difference]: Without dead ends: 4138 [2021-11-12 22:44:43,208 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 431 GetRequests, 276 SyntacticMatches, 0 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6552 ImplicationChecksByTransitivity, 19.2s TimeCoverageRelationStatistics Valid=3313, Invalid=21179, Unknown=0, NotChecked=0, Total=24492 [2021-11-12 22:44:43,209 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 2976 mSDsluCounter, 1651 mSDsCounter, 0 mSdLazyCounter, 3428 mSolverCounterSat, 364 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5270.96ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2976 SdHoareTripleChecker+Valid, 1730 SdHoareTripleChecker+Invalid, 3792 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 13.64ms SdHoareTripleChecker+Time, 364 IncrementalHoareTripleChecker+Valid, 3428 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5934.16ms IncrementalHoareTripleChecker+Time [2021-11-12 22:44:43,209 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2976 Valid, 1730 Invalid, 3792 Unknown, 0 Unchecked, 13.64ms Time], IncrementalHoareTripleChecker [364 Valid, 3428 Invalid, 0 Unknown, 0 Unchecked, 5934.16ms Time] [2021-11-12 22:44:43,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4138 states. [2021-11-12 22:44:43,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4138 to 1707. [2021-11-12 22:44:43,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1707 states, 1702 states have (on average 1.208578143360752) internal successors, (2057), 1706 states have internal predecessors, (2057), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:44:43,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1707 states to 1707 states and 2057 transitions. [2021-11-12 22:44:43,261 INFO L78 Accepts]: Start accepts. Automaton has 1707 states and 2057 transitions. Word has length 56 [2021-11-12 22:44:43,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:44:43,261 INFO L470 AbstractCegarLoop]: Abstraction has 1707 states and 2057 transitions. [2021-11-12 22:44:43,261 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 3.725806451612903) internal successors, (231), 62 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) [2021-11-12 22:44:43,261 INFO L276 IsEmpty]: Start isEmpty. Operand 1707 states and 2057 transitions. [2021-11-12 22:44:43,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-12 22:44:43,262 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:44:43,262 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] [2021-11-12 22:44:43,275 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (107)] Ended with exit code 0 [2021-11-12 22:44:43,482 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (108)] Forceful destruction successful, exit code 0 [2021-11-12 22:44:43,697 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Ended with exit code 0 [2021-11-12 22:44:43,876 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:44:43,876 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:44:43,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:44:43,877 INFO L85 PathProgramCache]: Analyzing trace with hash -1544267116, now seen corresponding path program 5 times [2021-11-12 22:44:43,877 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:44:43,877 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [872175597] [2021-11-12 22:44:43,877 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-12 22:44:43,878 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:44:43,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:44:43,879 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:44:43,880 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (110)] Waiting until timeout for monitored process [2021-11-12 22:44:44,120 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-12 22:44:44,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:44:44,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-12 22:44:44,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:44:44,665 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:44:44,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:44:46,234 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 15 proven. 85 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:44:46,234 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:44:46,234 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [872175597] [2021-11-12 22:44:46,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [872175597] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:44:46,234 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1465821292] [2021-11-12 22:44:46,234 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-12 22:44:46,234 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:44:46,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:44:46,235 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:44:46,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (111)] Waiting until timeout for monitored process [2021-11-12 22:45:48,318 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-12 22:45:48,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:45:48,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-12 22:45:48,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:45:49,147 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:45:49,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:45:50,280 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 11 proven. 89 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:45:50,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1465821292] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:45:50,280 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1398448094] [2021-11-12 22:45:50,280 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-12 22:45:50,280 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:45:50,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:45:50,281 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:45:50,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Waiting until timeout for monitored process [2021-11-12 22:46:04,566 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-12 22:46:04,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:46:04,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-12 22:46:04,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:46:05,443 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:46:05,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:46:05,823 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-12 22:46:05,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1398448094] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:46:05,823 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:46:05,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 18, 18, 20, 17] total 66 [2021-11-12 22:46:05,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841523132] [2021-11-12 22:46:05,823 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:46:05,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-12 22:46:05,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:46:05,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-12 22:46:05,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=505, Invalid=3785, Unknown=0, NotChecked=0, Total=4290 [2021-11-12 22:46:05,825 INFO L87 Difference]: Start difference. First operand 1707 states and 2057 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) [2021-11-12 22:46:10,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:46:10,992 INFO L93 Difference]: Finished difference Result 2780 states and 3239 transitions. [2021-11-12 22:46:10,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-12 22:46:10,993 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 [2021-11-12 22:46:10,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:46:10,997 INFO L225 Difference]: With dead ends: 2780 [2021-11-12 22:46:10,998 INFO L226 Difference]: Without dead ends: 2757 [2021-11-12 22:46:10,999 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 273 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3549 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=1693, Invalid=9019, Unknown=0, NotChecked=0, Total=10712 [2021-11-12 22:46:10,999 INFO L933 BasicCegarLoop]: 161 mSDtfsCounter, 2000 mSDsluCounter, 2809 mSDsCounter, 0 mSdLazyCounter, 2277 mSolverCounterSat, 188 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2412.42ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2000 SdHoareTripleChecker+Valid, 2970 SdHoareTripleChecker+Invalid, 2465 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.66ms SdHoareTripleChecker+Time, 188 IncrementalHoareTripleChecker+Valid, 2277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2747.02ms IncrementalHoareTripleChecker+Time [2021-11-12 22:46:10,999 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2000 Valid, 2970 Invalid, 2465 Unknown, 0 Unchecked, 9.66ms Time], IncrementalHoareTripleChecker [188 Valid, 2277 Invalid, 0 Unknown, 0 Unchecked, 2747.02ms Time] [2021-11-12 22:46:11,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2757 states. [2021-11-12 22:46:11,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2757 to 2111. [2021-11-12 22:46:11,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2111 states, 2106 states have (on average 1.2264957264957266) internal successors, (2583), 2110 states have internal predecessors, (2583), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:46:11,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2111 states to 2111 states and 2583 transitions. [2021-11-12 22:46:11,023 INFO L78 Accepts]: Start accepts. Automaton has 2111 states and 2583 transitions. Word has length 57 [2021-11-12 22:46:11,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:46:11,024 INFO L470 AbstractCegarLoop]: Abstraction has 2111 states and 2583 transitions. [2021-11-12 22:46:11,024 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) [2021-11-12 22:46:11,024 INFO L276 IsEmpty]: Start isEmpty. Operand 2111 states and 2583 transitions. [2021-11-12 22:46:11,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-12 22:46:11,026 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:46:11,026 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:46:11,040 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (110)] Ended with exit code 0 [2021-11-12 22:46:11,264 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Ended with exit code 0 [2021-11-12 22:46:11,452 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (111)] Ended with exit code 0 [2021-11-12 22:46:11,640 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 22:46:11,640 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:46:11,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:46:11,641 INFO L85 PathProgramCache]: Analyzing trace with hash 1205813609, now seen corresponding path program 2 times [2021-11-12 22:46:11,641 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:46:11,641 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2143140546] [2021-11-12 22:46:11,641 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:46:11,641 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:46:11,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:46:11,642 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:46:11,643 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (113)] Waiting until timeout for monitored process [2021-11-12 22:46:11,764 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:46:11,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:46:11,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-12 22:46:11,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:46:12,193 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 19 proven. 49 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:46:12,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:46:13,311 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 [2021-11-12 22:46:14,301 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:46:14,301 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:46:14,301 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2143140546] [2021-11-12 22:46:14,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2143140546] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:46:14,301 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [573393534] [2021-11-12 22:46:14,301 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:46:14,301 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:46:14,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:46:14,302 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:46:14,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (114)] Waiting until timeout for monitored process [2021-11-12 22:46:14,484 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:46:14,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:46:14,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-12 22:46:14,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:46:14,589 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-12 22:46:14,590 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 [2021-11-12 22:46:14,592 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 [2021-11-12 22:46:30,082 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 19 proven. 49 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:46:30,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:46:32,724 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 [2021-11-12 22:46:32,731 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:46:32,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [573393534] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:46:32,731 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1623893297] [2021-11-12 22:46:32,731 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 22:46:32,731 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:46:32,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:46:32,732 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:46:32,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2021-11-12 22:46:32,820 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 22:46:32,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:46:32,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-12 22:46:32,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:46:32,880 INFO L354 Elim1Store]: treesize reduction 46, result has 29.2 percent of original size [2021-11-12 22:46:32,880 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 [2021-11-12 22:46:32,883 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 [2021-11-12 22:46:42,221 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 19 proven. 49 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:46:42,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:46:44,354 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 33 [2021-11-12 22:46:44,466 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 13 proven. 55 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-12 22:46:44,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1623893297] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:46:44,466 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-12 22:46:44,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 15, 14, 13, 13] total 56 [2021-11-12 22:46:44,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937558730] [2021-11-12 22:46:44,466 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-12 22:46:44,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-12 22:46:44,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 22:46:44,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-12 22:46:44,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=2788, Unknown=0, NotChecked=0, Total=3192 [2021-11-12 22:46:44,468 INFO L87 Difference]: Start difference. First operand 2111 states and 2583 transitions. Second operand has 57 states, 56 states have (on average 4.071428571428571) internal successors, (228), 57 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:46:59,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:46:59,740 INFO L93 Difference]: Finished difference Result 2978 states and 3517 transitions. [2021-11-12 22:46:59,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-12 22:46:59,742 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 4.071428571428571) internal successors, (228), 57 states have internal predecessors, (228), 0 states have call successors, (0), 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 [2021-11-12 22:46:59,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:46:59,745 INFO L225 Difference]: With dead ends: 2978 [2021-11-12 22:46:59,745 INFO L226 Difference]: Without dead ends: 2943 [2021-11-12 22:46:59,746 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 291 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2316 ImplicationChecksByTransitivity, 37.6s TimeCoverageRelationStatistics Valid=743, Invalid=5737, Unknown=0, NotChecked=0, Total=6480 [2021-11-12 22:46:59,747 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 177 mSDsluCounter, 1094 mSDsCounter, 0 mSdLazyCounter, 561 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4211.25ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 1145 SdHoareTripleChecker+Invalid, 1207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.69ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 561 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 639 IncrementalHoareTripleChecker+Unchecked, 4411.66ms IncrementalHoareTripleChecker+Time [2021-11-12 22:46:59,747 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [177 Valid, 1145 Invalid, 1207 Unknown, 0 Unchecked, 3.69ms Time], IncrementalHoareTripleChecker [7 Valid, 561 Invalid, 0 Unknown, 639 Unchecked, 4411.66ms Time] [2021-11-12 22:46:59,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2943 states. [2021-11-12 22:46:59,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2943 to 2468. [2021-11-12 22:46:59,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2468 states, 2463 states have (on average 1.2192448233861144) internal successors, (3003), 2467 states have internal predecessors, (3003), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:46:59,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2468 states to 2468 states and 3003 transitions. [2021-11-12 22:46:59,782 INFO L78 Accepts]: Start accepts. Automaton has 2468 states and 3003 transitions. Word has length 57 [2021-11-12 22:46:59,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:46:59,783 INFO L470 AbstractCegarLoop]: Abstraction has 2468 states and 3003 transitions. [2021-11-12 22:46:59,783 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 56 states have (on average 4.071428571428571) internal successors, (228), 57 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-12 22:46:59,783 INFO L276 IsEmpty]: Start isEmpty. Operand 2468 states and 3003 transitions. [2021-11-12 22:46:59,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-12 22:46:59,785 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:46:59,785 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 22:46:59,829 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Forceful destruction successful, exit code 0 [2021-11-12 22:47:00,004 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (114)] Ended with exit code 0 [2021-11-12 22:47:00,209 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (113)] Ended with exit code 0 [2021-11-12 22:47:00,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 22:47:00,402 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-12 22:47:00,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:47:00,402 INFO L85 PathProgramCache]: Analyzing trace with hash -481096023, now seen corresponding path program 5 times [2021-11-12 22:47:00,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 22:47:00,402 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1327458023] [2021-11-12 22:47:00,402 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-12 22:47:00,402 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 22:47:00,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 22:47:00,403 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 22:47:00,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (116)] Waiting until timeout for monitored process [2021-11-12 22:47:00,804 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-12 22:47:00,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 22:47:00,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-12 22:47:00,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:47:01,306 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:47:01,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:47:02,682 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 27 treesize of output 23 [2021-11-12 22:47:03,621 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-12 22:47:03,621 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 22:47:03,621 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1327458023] [2021-11-12 22:47:03,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1327458023] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 22:47:03,621 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1070884615] [2021-11-12 22:47:03,622 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-12 22:47:03,622 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 22:47:03,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 22:47:03,622 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 22:47:03,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bca2cc46-0b5b-45d7-abf3-238ac6c2e191/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (117)] Waiting until timeout for monitored process