./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-ext-properties/960521-1_1-3.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 57096758 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext-properties/960521-1_1-3.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs --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 cbc7a588e1092d0916f2339b4d4b9e0fa8415335 ......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext-properties/960521-1_1-3.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs --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 cbc7a588e1092d0916f2339b4d4b9e0fa8415335 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(valid-free) --- Real Ultimate output --- This is Ultimate 0.2.1-dev-5709675 [2021-10-16 01:54:45,043 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-16 01:54:45,046 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-16 01:54:45,097 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-16 01:54:45,097 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-16 01:54:45,099 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-16 01:54:45,101 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-16 01:54:45,104 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-16 01:54:45,107 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-16 01:54:45,108 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-16 01:54:45,113 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-16 01:54:45,116 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-16 01:54:45,117 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-16 01:54:45,123 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-16 01:54:45,125 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-16 01:54:45,127 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-16 01:54:45,128 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-16 01:54:45,129 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-16 01:54:45,132 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-16 01:54:45,135 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-16 01:54:45,138 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-16 01:54:45,139 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-16 01:54:45,141 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-16 01:54:45,142 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-16 01:54:45,146 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-16 01:54:45,147 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-16 01:54:45,148 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-16 01:54:45,149 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-16 01:54:45,150 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-16 01:54:45,151 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-16 01:54:45,152 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-16 01:54:45,153 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-16 01:54:45,154 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-16 01:54:45,160 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-16 01:54:45,161 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-16 01:54:45,162 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-16 01:54:45,163 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-16 01:54:45,163 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-16 01:54:45,164 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-16 01:54:45,165 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-16 01:54:45,166 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-16 01:54:45,169 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-10-16 01:54:45,216 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-16 01:54:45,216 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-16 01:54:45,218 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-16 01:54:45,225 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-16 01:54:45,225 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-16 01:54:45,226 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-16 01:54:45,226 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-16 01:54:45,226 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-16 01:54:45,226 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-16 01:54:45,227 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-16 01:54:45,228 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-16 01:54:45,228 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-16 01:54:45,229 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-16 01:54:45,229 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-16 01:54:45,229 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-16 01:54:45,230 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-16 01:54:45,230 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-16 01:54:45,230 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-16 01:54:45,231 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-16 01:54:45,231 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-16 01:54:45,231 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-16 01:54:45,231 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-16 01:54:45,232 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-16 01:54:45,232 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-16 01:54:45,232 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-16 01:54:45,232 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-16 01:54:45,234 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-16 01:54:45,234 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-16 01:54:45,235 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-16 01:54:45,235 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-16 01:54:45,235 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-16 01:54:45,236 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-16 01:54:45,236 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-16 01:54:45,236 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-16 01:54:45,237 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-16 01:54:45,237 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-16 01:54:45,237 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-16 01:54:45,237 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-16 01:54:45,238 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-16 01:54:45,238 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_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cbc7a588e1092d0916f2339b4d4b9e0fa8415335 [2021-10-16 01:54:45,519 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-16 01:54:45,549 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-16 01:54:45,552 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-16 01:54:45,553 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-16 01:54:45,556 INFO L275 PluginConnector]: CDTParser initialized [2021-10-16 01:54:45,557 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/../../sv-benchmarks/c/list-ext-properties/960521-1_1-3.i [2021-10-16 01:54:45,652 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/data/14f084599/14bcd94bbe6147f08fd75bc4a692fa40/FLAGc8dc9195c [2021-10-16 01:54:46,240 INFO L306 CDTParser]: Found 1 translation units. [2021-10-16 01:54:46,254 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/sv-benchmarks/c/list-ext-properties/960521-1_1-3.i [2021-10-16 01:54:46,269 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/data/14f084599/14bcd94bbe6147f08fd75bc4a692fa40/FLAGc8dc9195c [2021-10-16 01:54:46,529 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/data/14f084599/14bcd94bbe6147f08fd75bc4a692fa40 [2021-10-16 01:54:46,540 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-16 01:54:46,541 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-16 01:54:46,547 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-16 01:54:46,547 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-16 01:54:46,552 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-16 01:54:46,554 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.10 01:54:46" (1/1) ... [2021-10-16 01:54:46,556 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@428eabec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:46, skipping insertion in model container [2021-10-16 01:54:46,557 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.10 01:54:46" (1/1) ... [2021-10-16 01:54:46,565 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-16 01:54:46,623 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-16 01:54:46,995 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-16 01:54:47,007 INFO L203 MainTranslator]: Completed pre-run [2021-10-16 01:54:47,076 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-16 01:54:47,117 INFO L208 MainTranslator]: Completed translation [2021-10-16 01:54:47,118 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:47 WrapperNode [2021-10-16 01:54:47,118 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-16 01:54:47,119 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-16 01:54:47,119 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-16 01:54:47,120 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-16 01:54:47,128 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:47" (1/1) ... [2021-10-16 01:54:47,144 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:47" (1/1) ... [2021-10-16 01:54:47,169 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-16 01:54:47,170 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-16 01:54:47,170 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-16 01:54:47,170 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-16 01:54:47,180 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:47" (1/1) ... [2021-10-16 01:54:47,180 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:47" (1/1) ... [2021-10-16 01:54:47,184 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:47" (1/1) ... [2021-10-16 01:54:47,184 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:47" (1/1) ... [2021-10-16 01:54:47,192 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:47" (1/1) ... [2021-10-16 01:54:47,197 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:47" (1/1) ... [2021-10-16 01:54:47,199 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:47" (1/1) ... [2021-10-16 01:54:47,201 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-16 01:54:47,202 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-16 01:54:47,203 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-16 01:54:47,203 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-16 01:54:47,204 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:47" (1/1) ... [2021-10-16 01:54:47,212 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-16 01:54:47,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 01:54:47,239 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-16 01:54:47,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-16 01:54:47,293 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-16 01:54:47,294 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-16 01:54:47,294 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-10-16 01:54:47,294 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-16 01:54:47,294 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-16 01:54:47,296 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-16 01:54:47,296 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-16 01:54:47,297 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-16 01:54:47,648 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-16 01:54:47,649 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-10-16 01:54:47,652 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.10 01:54:47 BoogieIcfgContainer [2021-10-16 01:54:47,652 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-16 01:54:47,654 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-16 01:54:47,655 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-16 01:54:47,659 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-16 01:54:47,659 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.10 01:54:46" (1/3) ... [2021-10-16 01:54:47,660 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e8499e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.10 01:54:47, skipping insertion in model container [2021-10-16 01:54:47,661 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:47" (2/3) ... [2021-10-16 01:54:47,661 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e8499e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.10 01:54:47, skipping insertion in model container [2021-10-16 01:54:47,661 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.10 01:54:47" (3/3) ... [2021-10-16 01:54:47,663 INFO L111 eAbstractionObserver]: Analyzing ICFG 960521-1_1-3.i [2021-10-16 01:54:47,670 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-16 01:54:47,670 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 21 error locations. [2021-10-16 01:54:47,745 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-16 01:54:47,753 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, mConcurrency=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 [2021-10-16 01:54:47,753 INFO L340 AbstractCegarLoop]: Starting to check reachability of 21 error locations. [2021-10-16 01:54:47,772 INFO L276 IsEmpty]: Start isEmpty. Operand has 47 states, 25 states have (on average 2.04) internal successors, (51), 46 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) [2021-10-16 01:54:47,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-10-16 01:54:47,779 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:54:47,780 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-10-16 01:54:47,781 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:54:47,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:54:47,788 INFO L82 PathProgramCache]: Analyzing trace with hash 3767634, now seen corresponding path program 1 times [2021-10-16 01:54:47,799 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-16 01:54:47,799 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648818365] [2021-10-16 01:54:47,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:47,801 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-16 01:54:47,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:48,039 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:48,040 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-16 01:54:48,041 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648818365] [2021-10-16 01:54:48,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [648818365] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-16 01:54:48,043 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-16 01:54:48,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-16 01:54:48,051 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25931629] [2021-10-16 01:54:48,060 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-10-16 01:54:48,060 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-16 01:54:48,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-10-16 01:54:48,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-16 01:54:48,084 INFO L87 Difference]: Start difference. First operand has 47 states, 25 states have (on average 2.04) internal successors, (51), 46 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) Second operand has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:48,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:54:48,104 INFO L93 Difference]: Finished difference Result 47 states and 50 transitions. [2021-10-16 01:54:48,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-10-16 01:54:48,106 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 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 4 [2021-10-16 01:54:48,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:54:48,116 INFO L225 Difference]: With dead ends: 47 [2021-10-16 01:54:48,116 INFO L226 Difference]: Without dead ends: 46 [2021-10-16 01:54:48,120 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0ms TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-16 01:54:48,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-10-16 01:54:48,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-10-16 01:54:48,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 25 states have (on average 1.96) internal successors, (49), 45 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) [2021-10-16 01:54:48,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2021-10-16 01:54:48,163 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 4 [2021-10-16 01:54:48,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:54:48,164 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2021-10-16 01:54:48,165 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:48,165 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2021-10-16 01:54:48,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-10-16 01:54:48,166 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:54:48,166 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-10-16 01:54:48,166 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-16 01:54:48,166 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:54:48,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:54:48,172 INFO L82 PathProgramCache]: Analyzing trace with hash 116582307, now seen corresponding path program 1 times [2021-10-16 01:54:48,172 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-16 01:54:48,172 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [132642013] [2021-10-16 01:54:48,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:48,173 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-16 01:54:48,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:48,284 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:48,284 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-16 01:54:48,285 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [132642013] [2021-10-16 01:54:48,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [132642013] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-16 01:54:48,285 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-16 01:54:48,286 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-16 01:54:48,287 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412695512] [2021-10-16 01:54:48,288 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-16 01:54:48,289 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-16 01:54:48,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-16 01:54:48,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-16 01:54:48,292 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:48,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:54:48,362 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2021-10-16 01:54:48,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-16 01:54:48,362 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 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 5 [2021-10-16 01:54:48,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:54:48,365 INFO L225 Difference]: With dead ends: 45 [2021-10-16 01:54:48,365 INFO L226 Difference]: Without dead ends: 45 [2021-10-16 01:54:48,366 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-16 01:54:48,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-10-16 01:54:48,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-10-16 01:54:48,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 25 states have (on average 1.92) internal successors, (48), 44 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) [2021-10-16 01:54:48,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2021-10-16 01:54:48,378 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 5 [2021-10-16 01:54:48,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:54:48,378 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2021-10-16 01:54:48,379 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:48,379 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2021-10-16 01:54:48,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-10-16 01:54:48,380 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:54:48,380 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-10-16 01:54:48,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-16 01:54:48,381 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:54:48,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:54:48,386 INFO L82 PathProgramCache]: Analyzing trace with hash 116582308, now seen corresponding path program 1 times [2021-10-16 01:54:48,387 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-16 01:54:48,387 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1688660336] [2021-10-16 01:54:48,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:48,388 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-16 01:54:48,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:48,496 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:48,497 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-16 01:54:48,497 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1688660336] [2021-10-16 01:54:48,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1688660336] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-16 01:54:48,504 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-16 01:54:48,505 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-16 01:54:48,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265914527] [2021-10-16 01:54:48,506 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-16 01:54:48,506 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-16 01:54:48,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-16 01:54:48,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-16 01:54:48,508 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:48,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:54:48,609 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2021-10-16 01:54:48,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-16 01:54:48,610 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 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 5 [2021-10-16 01:54:48,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:54:48,611 INFO L225 Difference]: With dead ends: 88 [2021-10-16 01:54:48,612 INFO L226 Difference]: Without dead ends: 88 [2021-10-16 01:54:48,613 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 24.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-16 01:54:48,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-10-16 01:54:48,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 49. [2021-10-16 01:54:48,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 29 states have (on average 1.8275862068965518) internal successors, (53), 48 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) [2021-10-16 01:54:48,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2021-10-16 01:54:48,624 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 5 [2021-10-16 01:54:48,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:54:48,625 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2021-10-16 01:54:48,625 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:48,625 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2021-10-16 01:54:48,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-10-16 01:54:48,626 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:54:48,626 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:54:48,626 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-10-16 01:54:48,626 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:54:48,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:54:48,628 INFO L82 PathProgramCache]: Analyzing trace with hash 366521265, now seen corresponding path program 1 times [2021-10-16 01:54:48,628 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-16 01:54:48,629 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369151787] [2021-10-16 01:54:48,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:48,630 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-16 01:54:48,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:48,711 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:48,712 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-16 01:54:48,713 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369151787] [2021-10-16 01:54:48,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1369151787] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-16 01:54:48,714 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-16 01:54:48,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-16 01:54:48,717 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580898399] [2021-10-16 01:54:48,718 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-16 01:54:48,718 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-16 01:54:48,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-16 01:54:48,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-16 01:54:48,719 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:48,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:54:48,768 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2021-10-16 01:54:48,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-16 01:54:48,769 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 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 [2021-10-16 01:54:48,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:54:48,770 INFO L225 Difference]: With dead ends: 46 [2021-10-16 01:54:48,771 INFO L226 Difference]: Without dead ends: 46 [2021-10-16 01:54:48,771 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.8ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-16 01:54:48,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-10-16 01:54:48,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-10-16 01:54:48,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 29 states have (on average 1.7241379310344827) internal successors, (50), 45 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) [2021-10-16 01:54:48,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-10-16 01:54:48,780 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 7 [2021-10-16 01:54:48,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:54:48,782 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-10-16 01:54:48,782 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:48,782 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-10-16 01:54:48,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-10-16 01:54:48,783 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:54:48,783 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:54:48,784 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-10-16 01:54:48,784 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:54:48,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:54:48,785 INFO L82 PathProgramCache]: Analyzing trace with hash 366521266, now seen corresponding path program 1 times [2021-10-16 01:54:48,785 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-16 01:54:48,786 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [788358818] [2021-10-16 01:54:48,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:48,786 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-16 01:54:48,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:48,956 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:48,957 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-16 01:54:48,957 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [788358818] [2021-10-16 01:54:48,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [788358818] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-16 01:54:48,957 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-16 01:54:48,957 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-10-16 01:54:48,958 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658716309] [2021-10-16 01:54:48,958 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-16 01:54:48,958 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-16 01:54:48,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-16 01:54:48,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-16 01:54:48,959 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:49,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:54:49,059 INFO L93 Difference]: Finished difference Result 79 states and 84 transitions. [2021-10-16 01:54:49,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-16 01:54:49,059 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 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 [2021-10-16 01:54:49,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:54:49,063 INFO L225 Difference]: With dead ends: 79 [2021-10-16 01:54:49,064 INFO L226 Difference]: Without dead ends: 79 [2021-10-16 01:54:49,064 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 58.9ms TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-16 01:54:49,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-10-16 01:54:49,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 55. [2021-10-16 01:54:49,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 54 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:49,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2021-10-16 01:54:49,079 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 7 [2021-10-16 01:54:49,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:54:49,080 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2021-10-16 01:54:49,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:49,080 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2021-10-16 01:54:49,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-10-16 01:54:49,081 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:54:49,081 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2021-10-16 01:54:49,081 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-10-16 01:54:49,081 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:54:49,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:54:49,082 INFO L82 PathProgramCache]: Analyzing trace with hash 368019081, now seen corresponding path program 1 times [2021-10-16 01:54:49,083 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-16 01:54:49,083 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605063381] [2021-10-16 01:54:49,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:49,088 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-16 01:54:49,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:49,165 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:49,166 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-16 01:54:49,166 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605063381] [2021-10-16 01:54:49,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [605063381] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-16 01:54:49,166 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1154884309] [2021-10-16 01:54:49,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:49,167 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:54:49,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 01:54:49,176 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 01:54:49,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-16 01:54:49,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:49,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 01:54:49,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:54:49,360 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-10-16 01:54:49,361 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 1 case distinctions, treesize of input 17 treesize of output 18 [2021-10-16 01:54:49,438 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:49,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:54:49,509 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:49,510 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1154884309] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 01:54:49,510 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-10-16 01:54:49,510 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 7 [2021-10-16 01:54:49,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119457085] [2021-10-16 01:54:49,513 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-16 01:54:49,513 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-16 01:54:49,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-16 01:54:49,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-10-16 01:54:49,515 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand has 7 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) [2021-10-16 01:54:49,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:54:49,610 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2021-10-16 01:54:49,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-16 01:54:49,610 INFO L78 Accepts]: Start accepts. Automaton has has 7 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 7 [2021-10-16 01:54:49,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:54:49,612 INFO L225 Difference]: With dead ends: 78 [2021-10-16 01:54:49,612 INFO L226 Difference]: Without dead ends: 78 [2021-10-16 01:54:49,616 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 97.0ms TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2021-10-16 01:54:49,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-10-16 01:54:49,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 54. [2021-10-16 01:54:49,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 38 states have (on average 1.6578947368421053) internal successors, (63), 53 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:49,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2021-10-16 01:54:49,623 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 7 [2021-10-16 01:54:49,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:54:49,623 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2021-10-16 01:54:49,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 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) [2021-10-16 01:54:49,624 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2021-10-16 01:54:49,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-10-16 01:54:49,624 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:54:49,624 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:54:49,665 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-16 01:54:49,825 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:54:49,825 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:54:49,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:54:49,826 INFO L82 PathProgramCache]: Analyzing trace with hash 39678835, now seen corresponding path program 1 times [2021-10-16 01:54:49,826 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-16 01:54:49,826 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392739624] [2021-10-16 01:54:49,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:49,826 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-16 01:54:49,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:49,879 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:49,880 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-16 01:54:49,880 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392739624] [2021-10-16 01:54:49,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [392739624] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-16 01:54:49,880 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [496042881] [2021-10-16 01:54:49,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:49,880 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:54:49,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 01:54:49,882 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 01:54:49,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-16 01:54:49,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:49,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 01:54:49,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:54:50,019 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:50,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:54:50,065 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:50,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [496042881] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 01:54:50,065 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-10-16 01:54:50,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [4] total 9 [2021-10-16 01:54:50,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624281329] [2021-10-16 01:54:50,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-16 01:54:50,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-16 01:54:50,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-16 01:54:50,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-10-16 01:54:50,067 INFO L87 Difference]: Start difference. First operand 54 states and 63 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) 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) [2021-10-16 01:54:50,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:54:50,117 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2021-10-16 01:54:50,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-16 01:54:50,117 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) 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 [2021-10-16 01:54:50,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:54:50,118 INFO L225 Difference]: With dead ends: 76 [2021-10-16 01:54:50,118 INFO L226 Difference]: Without dead ends: 76 [2021-10-16 01:54:50,118 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 44.4ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-10-16 01:54:50,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-10-16 01:54:50,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 53. [2021-10-16 01:54:50,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 52 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:50,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2021-10-16 01:54:50,122 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 9 [2021-10-16 01:54:50,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:54:50,122 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2021-10-16 01:54:50,122 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) 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) [2021-10-16 01:54:50,122 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2021-10-16 01:54:50,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-10-16 01:54:50,123 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:54:50,123 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:54:50,157 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-10-16 01:54:50,347 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-10-16 01:54:50,348 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:54:50,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:54:50,348 INFO L82 PathProgramCache]: Analyzing trace with hash 1479091543, now seen corresponding path program 1 times [2021-10-16 01:54:50,348 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-16 01:54:50,349 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119556904] [2021-10-16 01:54:50,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:50,349 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-16 01:54:50,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:50,487 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:50,487 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-16 01:54:50,488 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119556904] [2021-10-16 01:54:50,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [119556904] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-16 01:54:50,488 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [818001075] [2021-10-16 01:54:50,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:50,488 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:54:50,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 01:54:50,492 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 01:54:50,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-10-16 01:54:50,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:50,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-16 01:54:50,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:54:50,620 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-10-16 01:54:50,620 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 1 case distinctions, treesize of input 17 treesize of output 18 [2021-10-16 01:54:50,742 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:50,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:54:50,848 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:50,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [818001075] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 01:54:50,850 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-10-16 01:54:50,850 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5] total 11 [2021-10-16 01:54:50,851 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841499532] [2021-10-16 01:54:50,851 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-16 01:54:50,851 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-16 01:54:50,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-16 01:54:50,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2021-10-16 01:54:50,852 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 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) [2021-10-16 01:54:51,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:54:51,149 INFO L93 Difference]: Finished difference Result 113 states and 119 transitions. [2021-10-16 01:54:51,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-16 01:54:51,151 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 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 9 [2021-10-16 01:54:51,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:54:51,152 INFO L225 Difference]: With dead ends: 113 [2021-10-16 01:54:51,152 INFO L226 Difference]: Without dead ends: 113 [2021-10-16 01:54:51,152 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 228.5ms TimeCoverageRelationStatistics Valid=101, Invalid=205, Unknown=0, NotChecked=0, Total=306 [2021-10-16 01:54:51,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-10-16 01:54:51,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 52. [2021-10-16 01:54:51,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 38 states have (on average 1.5) internal successors, (57), 51 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:51,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2021-10-16 01:54:51,157 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 9 [2021-10-16 01:54:51,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:54:51,157 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2021-10-16 01:54:51,157 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 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) [2021-10-16 01:54:51,158 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2021-10-16 01:54:51,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-16 01:54:51,158 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:54:51,159 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:54:51,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-10-16 01:54:51,359 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:54:51,359 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:54:51,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:54:51,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1230114217, now seen corresponding path program 1 times [2021-10-16 01:54:51,360 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-16 01:54:51,360 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1906055770] [2021-10-16 01:54:51,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:51,360 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-16 01:54:51,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:51,398 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 01:54:51,398 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-16 01:54:51,400 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1906055770] [2021-10-16 01:54:51,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1906055770] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-16 01:54:51,401 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-16 01:54:51,401 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-16 01:54:51,401 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242453525] [2021-10-16 01:54:51,402 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-16 01:54:51,402 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-16 01:54:51,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-16 01:54:51,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-16 01:54:51,407 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. 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) [2021-10-16 01:54:51,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:54:51,447 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2021-10-16 01:54:51,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-16 01:54:51,448 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 10 [2021-10-16 01:54:51,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:54:51,449 INFO L225 Difference]: With dead ends: 50 [2021-10-16 01:54:51,449 INFO L226 Difference]: Without dead ends: 50 [2021-10-16 01:54:51,449 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-16 01:54:51,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-10-16 01:54:51,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-10-16 01:54:51,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 49 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:51,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2021-10-16 01:54:51,453 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 10 [2021-10-16 01:54:51,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:54:51,454 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2021-10-16 01:54:51,454 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) [2021-10-16 01:54:51,454 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2021-10-16 01:54:51,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-16 01:54:51,454 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:54:51,454 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:54:51,455 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-10-16 01:54:51,455 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:54:51,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:54:51,455 INFO L82 PathProgramCache]: Analyzing trace with hash 1230114218, now seen corresponding path program 1 times [2021-10-16 01:54:51,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-16 01:54:51,455 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451490123] [2021-10-16 01:54:51,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:51,455 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-16 01:54:51,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:51,536 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 01:54:51,536 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-16 01:54:51,537 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451490123] [2021-10-16 01:54:51,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [451490123] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-16 01:54:51,537 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-16 01:54:51,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-16 01:54:51,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083031070] [2021-10-16 01:54:51,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-16 01:54:51,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-16 01:54:51,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-16 01:54:51,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-16 01:54:51,539 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 5 states, 4 states have (on average 2.5) 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) [2021-10-16 01:54:51,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:54:51,596 INFO L93 Difference]: Finished difference Result 53 states and 56 transitions. [2021-10-16 01:54:51,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-16 01:54:51,596 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) 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 10 [2021-10-16 01:54:51,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:54:51,597 INFO L225 Difference]: With dead ends: 53 [2021-10-16 01:54:51,597 INFO L226 Difference]: Without dead ends: 53 [2021-10-16 01:54:51,598 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 18.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-16 01:54:51,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-10-16 01:54:51,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 40. [2021-10-16 01:54:51,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 39 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) [2021-10-16 01:54:51,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2021-10-16 01:54:51,602 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 10 [2021-10-16 01:54:51,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:54:51,602 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2021-10-16 01:54:51,602 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) 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) [2021-10-16 01:54:51,602 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2021-10-16 01:54:51,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-10-16 01:54:51,604 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:54:51,604 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:54:51,604 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-10-16 01:54:51,604 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:54:51,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:54:51,605 INFO L82 PathProgramCache]: Analyzing trace with hash 1548611473, now seen corresponding path program 1 times [2021-10-16 01:54:51,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-16 01:54:51,605 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075360063] [2021-10-16 01:54:51,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:51,606 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-16 01:54:51,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:51,680 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:51,680 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-16 01:54:51,680 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075360063] [2021-10-16 01:54:51,681 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1075360063] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-16 01:54:51,681 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1377901847] [2021-10-16 01:54:51,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:51,681 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:54:51,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 01:54:51,682 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 01:54:51,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-10-16 01:54:51,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:51,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-16 01:54:51,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:54:51,836 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:51,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:54:51,888 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:51,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1377901847] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:54:51,889 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [160028349] [2021-10-16 01:54:51,910 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-10-16 01:54:51,911 INFO L166 IcfgInterpreter]: Building call graph [2021-10-16 01:54:51,915 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-16 01:54:51,921 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-16 01:54:51,922 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-16 01:54:51,956 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 01:54:51,960 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-16 01:54:51,961 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 01:54:51,962 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-10-16 01:54:51,963 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-16 01:54:51,963 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 01:54:51,964 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-10-16 01:54:51,967 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-10-16 01:54:51,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-16 01:54:51,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:54:51,989 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 01:54:51,990 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-16 01:54:51,993 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 01:54:51,993 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-16 01:54:51,994 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-16 01:54:51,996 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-16 01:54:52,005 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 01:54:52,007 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-16 01:54:52,009 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 105 [2021-10-16 01:54:52,010 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-10-16 01:54:52,010 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:104, output treesize:105 [2021-10-16 01:54:52,052 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-10-16 01:54:52,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:54:52,224 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: No corresponding IProgramVar for |v_#valid_47| at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:83) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.constructTermVarsProc(BasicPredicateFactory.java:92) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.newPredicate(BasicPredicateFactory.java:81) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.predicate(SymbolicTools.java:174) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.post(SymbolicTools.java:116) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretInternal(DagInterpreter.java:227) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:209) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:53) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:392) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-16 01:54:52,227 INFO L168 Benchmark]: Toolchain (without parser) took 5685.29 ms. Allocated memory was 104.9 MB in the beginning and 125.8 MB in the end (delta: 21.0 MB). Free memory was 71.2 MB in the beginning and 66.3 MB in the end (delta: 4.9 MB). Peak memory consumption was 24.1 MB. Max. memory is 16.1 GB. [2021-10-16 01:54:52,227 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 104.9 MB. Free memory is still 57.6 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-16 01:54:52,228 INFO L168 Benchmark]: CACSL2BoogieTranslator took 571.60 ms. Allocated memory is still 104.9 MB. Free memory was 70.8 MB in the beginning and 73.5 MB in the end (delta: -2.7 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2021-10-16 01:54:52,228 INFO L168 Benchmark]: Boogie Procedure Inliner took 49.93 ms. Allocated memory is still 104.9 MB. Free memory was 73.5 MB in the beginning and 71.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-16 01:54:52,228 INFO L168 Benchmark]: Boogie Preprocessor took 31.99 ms. Allocated memory is still 104.9 MB. Free memory was 71.4 MB in the beginning and 70.1 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-16 01:54:52,229 INFO L168 Benchmark]: RCFGBuilder took 449.74 ms. Allocated memory is still 104.9 MB. Free memory was 70.1 MB in the beginning and 56.1 MB in the end (delta: 14.0 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-10-16 01:54:52,229 INFO L168 Benchmark]: TraceAbstraction took 4571.95 ms. Allocated memory was 104.9 MB in the beginning and 125.8 MB in the end (delta: 21.0 MB). Free memory was 55.8 MB in the beginning and 66.3 MB in the end (delta: -10.5 MB). Peak memory consumption was 12.1 MB. Max. memory is 16.1 GB. [2021-10-16 01:54:52,231 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 104.9 MB. Free memory is still 57.6 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 571.60 ms. Allocated memory is still 104.9 MB. Free memory was 70.8 MB in the beginning and 73.5 MB in the end (delta: -2.7 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 49.93 ms. Allocated memory is still 104.9 MB. Free memory was 73.5 MB in the beginning and 71.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 31.99 ms. Allocated memory is still 104.9 MB. Free memory was 71.4 MB in the beginning and 70.1 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 449.74 ms. Allocated memory is still 104.9 MB. Free memory was 70.1 MB in the beginning and 56.1 MB in the end (delta: 14.0 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 4571.95 ms. Allocated memory was 104.9 MB in the beginning and 125.8 MB in the end (delta: 21.0 MB). Free memory was 55.8 MB in the beginning and 66.3 MB in the end (delta: -10.5 MB). Peak memory consumption was 12.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: No corresponding IProgramVar for |v_#valid_47| de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: No corresponding IProgramVar for |v_#valid_47|: de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-10-16 01:54:52,275 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... ### Bit-precise run ### This is Ultimate 0.2.1-dev-5709675 [2021-10-16 01:54:54,933 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-16 01:54:54,936 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-16 01:54:54,993 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-16 01:54:54,994 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-16 01:54:54,999 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-16 01:54:55,001 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-16 01:54:55,006 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-16 01:54:55,009 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-16 01:54:55,020 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-16 01:54:55,022 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-16 01:54:55,024 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-16 01:54:55,025 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-16 01:54:55,028 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-16 01:54:55,031 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-16 01:54:55,037 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-16 01:54:55,039 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-16 01:54:55,040 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-16 01:54:55,042 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-16 01:54:55,051 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-16 01:54:55,054 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-16 01:54:55,055 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-16 01:54:55,059 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-16 01:54:55,060 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-16 01:54:55,069 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-16 01:54:55,070 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-16 01:54:55,070 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-16 01:54:55,073 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-16 01:54:55,073 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-16 01:54:55,074 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-16 01:54:55,075 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-16 01:54:55,076 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-16 01:54:55,078 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-16 01:54:55,079 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-16 01:54:55,081 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-16 01:54:55,081 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-16 01:54:55,082 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-16 01:54:55,082 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-16 01:54:55,082 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-16 01:54:55,084 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-16 01:54:55,085 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-16 01:54:55,086 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2021-10-16 01:54:55,138 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-16 01:54:55,138 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-16 01:54:55,139 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-16 01:54:55,139 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-16 01:54:55,140 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-16 01:54:55,140 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-16 01:54:55,140 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-16 01:54:55,140 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-16 01:54:55,140 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-16 01:54:55,141 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-16 01:54:55,141 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-16 01:54:55,142 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-16 01:54:55,142 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-16 01:54:55,142 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-16 01:54:55,142 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-16 01:54:55,143 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-16 01:54:55,143 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-16 01:54:55,143 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-16 01:54:55,143 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-16 01:54:55,143 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-16 01:54:55,144 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-16 01:54:55,144 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-16 01:54:55,144 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-10-16 01:54:55,144 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-10-16 01:54:55,145 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-16 01:54:55,145 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-16 01:54:55,145 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-16 01:54:55,145 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-16 01:54:55,145 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-16 01:54:55,146 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-16 01:54:55,146 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-16 01:54:55,146 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-16 01:54:55,147 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-10-16 01:54:55,147 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-10-16 01:54:55,147 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-16 01:54:55,147 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-16 01:54:55,147 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_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cbc7a588e1092d0916f2339b4d4b9e0fa8415335 [2021-10-16 01:54:55,579 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-16 01:54:55,617 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-16 01:54:55,620 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-16 01:54:55,621 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-16 01:54:55,622 INFO L275 PluginConnector]: CDTParser initialized [2021-10-16 01:54:55,623 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/../../sv-benchmarks/c/list-ext-properties/960521-1_1-3.i [2021-10-16 01:54:55,708 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/data/7a2a2cde2/0f21cfb1b4c8462b8a8ce14bea7583a8/FLAG805ff56e7 [2021-10-16 01:54:56,323 INFO L306 CDTParser]: Found 1 translation units. [2021-10-16 01:54:56,324 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/sv-benchmarks/c/list-ext-properties/960521-1_1-3.i [2021-10-16 01:54:56,351 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/data/7a2a2cde2/0f21cfb1b4c8462b8a8ce14bea7583a8/FLAG805ff56e7 [2021-10-16 01:54:56,596 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/data/7a2a2cde2/0f21cfb1b4c8462b8a8ce14bea7583a8 [2021-10-16 01:54:56,598 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-16 01:54:56,600 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-16 01:54:56,601 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-16 01:54:56,601 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-16 01:54:56,605 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-16 01:54:56,606 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.10 01:54:56" (1/1) ... [2021-10-16 01:54:56,607 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@81113d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:56, skipping insertion in model container [2021-10-16 01:54:56,607 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 16.10 01:54:56" (1/1) ... [2021-10-16 01:54:56,614 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-16 01:54:56,648 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-16 01:54:56,953 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-16 01:54:56,966 INFO L203 MainTranslator]: Completed pre-run [2021-10-16 01:54:57,010 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-16 01:54:57,046 INFO L208 MainTranslator]: Completed translation [2021-10-16 01:54:57,047 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:57 WrapperNode [2021-10-16 01:54:57,047 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-16 01:54:57,048 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-16 01:54:57,048 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-16 01:54:57,049 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-16 01:54:57,056 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:57" (1/1) ... [2021-10-16 01:54:57,075 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:57" (1/1) ... [2021-10-16 01:54:57,097 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-16 01:54:57,098 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-16 01:54:57,098 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-16 01:54:57,099 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-16 01:54:57,107 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:57" (1/1) ... [2021-10-16 01:54:57,108 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:57" (1/1) ... [2021-10-16 01:54:57,112 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:57" (1/1) ... [2021-10-16 01:54:57,113 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:57" (1/1) ... [2021-10-16 01:54:57,121 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:57" (1/1) ... [2021-10-16 01:54:57,125 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:57" (1/1) ... [2021-10-16 01:54:57,127 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:57" (1/1) ... [2021-10-16 01:54:57,130 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-16 01:54:57,131 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-16 01:54:57,131 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-16 01:54:57,131 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-16 01:54:57,132 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:57" (1/1) ... [2021-10-16 01:54:57,139 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-16 01:54:57,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 01:54:57,161 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-16 01:54:57,194 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-16 01:54:57,226 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-10-16 01:54:57,226 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-10-16 01:54:57,227 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-16 01:54:57,227 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-16 01:54:57,227 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-10-16 01:54:57,227 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-10-16 01:54:57,227 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-16 01:54:57,228 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-16 01:54:57,694 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-16 01:54:57,701 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-10-16 01:54:57,703 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.10 01:54:57 BoogieIcfgContainer [2021-10-16 01:54:57,704 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-16 01:54:57,706 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-16 01:54:57,707 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-16 01:54:57,710 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-16 01:54:57,711 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 16.10 01:54:56" (1/3) ... [2021-10-16 01:54:57,712 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1de7235d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.10 01:54:57, skipping insertion in model container [2021-10-16 01:54:57,712 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 16.10 01:54:57" (2/3) ... [2021-10-16 01:54:57,713 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1de7235d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 16.10 01:54:57, skipping insertion in model container [2021-10-16 01:54:57,713 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.10 01:54:57" (3/3) ... [2021-10-16 01:54:57,714 INFO L111 eAbstractionObserver]: Analyzing ICFG 960521-1_1-3.i [2021-10-16 01:54:57,720 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-16 01:54:57,721 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 21 error locations. [2021-10-16 01:54:57,781 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-16 01:54:57,791 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, mConcurrency=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 [2021-10-16 01:54:57,791 INFO L340 AbstractCegarLoop]: Starting to check reachability of 21 error locations. [2021-10-16 01:54:57,808 INFO L276 IsEmpty]: Start isEmpty. Operand has 52 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 51 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:57,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-10-16 01:54:57,826 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:54:57,827 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-10-16 01:54:57,828 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:54:57,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:54:57,834 INFO L82 PathProgramCache]: Analyzing trace with hash 28697864, now seen corresponding path program 1 times [2021-10-16 01:54:57,846 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:54:57,847 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1937897331] [2021-10-16 01:54:57,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:57,849 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:54:57,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:54:57,854 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:54:57,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-10-16 01:54:57,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:57,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 2 conjunts are in the unsatisfiable core [2021-10-16 01:54:57,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:54:58,084 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-10-16 01:54:58,085 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 1 case distinctions, treesize of input 9 treesize of output 14 [2021-10-16 01:54:58,144 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:58,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:54:58,178 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:58,179 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:54:58,179 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1937897331] [2021-10-16 01:54:58,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1937897331] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 01:54:58,181 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-16 01:54:58,181 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-10-16 01:54:58,185 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373728326] [2021-10-16 01:54:58,191 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-16 01:54:58,192 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:54:58,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-16 01:54:58,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-16 01:54:58,214 INFO L87 Difference]: Start difference. First operand has 52 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 51 states have internal predecessors, (58), 0 states have call successors, (0), 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 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:58,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:54:58,321 INFO L93 Difference]: Finished difference Result 51 states and 54 transitions. [2021-10-16 01:54:58,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-16 01:54:58,326 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 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 5 [2021-10-16 01:54:58,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:54:58,335 INFO L225 Difference]: With dead ends: 51 [2021-10-16 01:54:58,336 INFO L226 Difference]: Without dead ends: 49 [2021-10-16 01:54:58,337 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-16 01:54:58,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-10-16 01:54:58,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-10-16 01:54:58,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 29 states have (on average 1.793103448275862) internal successors, (52), 48 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) [2021-10-16 01:54:58,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2021-10-16 01:54:58,384 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 5 [2021-10-16 01:54:58,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:54:58,384 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2021-10-16 01:54:58,386 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:58,386 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2021-10-16 01:54:58,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-10-16 01:54:58,386 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:54:58,387 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-10-16 01:54:58,405 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-10-16 01:54:58,606 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 01:54:58,606 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:54:58,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:54:58,610 INFO L82 PathProgramCache]: Analyzing trace with hash 28697865, now seen corresponding path program 1 times [2021-10-16 01:54:58,612 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:54:58,613 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [601593480] [2021-10-16 01:54:58,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:58,613 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:54:58,614 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:54:58,615 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:54:58,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-10-16 01:54:58,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:58,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 01:54:58,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:54:58,767 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:54:58,768 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:54:58,811 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:58,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:54:58,927 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:58,927 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:54:58,927 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [601593480] [2021-10-16 01:54:58,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [601593480] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 01:54:58,928 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-16 01:54:58,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-10-16 01:54:58,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997025807] [2021-10-16 01:54:58,929 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-16 01:54:58,930 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:54:58,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-16 01:54:58,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-16 01:54:58,931 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 6 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:59,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:54:59,173 INFO L93 Difference]: Finished difference Result 141 states and 150 transitions. [2021-10-16 01:54:59,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-16 01:54:59,178 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 6 states have internal predecessors, (9), 0 states have call successors, (0), 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 5 [2021-10-16 01:54:59,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:54:59,183 INFO L225 Difference]: With dead ends: 141 [2021-10-16 01:54:59,183 INFO L226 Difference]: Without dead ends: 141 [2021-10-16 01:54:59,184 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 114.3ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-10-16 01:54:59,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-10-16 01:54:59,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 53. [2021-10-16 01:54:59,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 52 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:59,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 58 transitions. [2021-10-16 01:54:59,200 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 58 transitions. Word has length 5 [2021-10-16 01:54:59,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:54:59,200 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 58 transitions. [2021-10-16 01:54:59,201 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 6 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:54:59,205 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 58 transitions. [2021-10-16 01:54:59,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-10-16 01:54:59,205 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:54:59,206 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2021-10-16 01:54:59,219 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-10-16 01:54:59,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 01:54:59,418 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:54:59,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:54:59,419 INFO L82 PathProgramCache]: Analyzing trace with hash 1810564201, now seen corresponding path program 1 times [2021-10-16 01:54:59,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:54:59,419 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [746570273] [2021-10-16 01:54:59,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:59,420 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:54:59,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:54:59,426 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:54:59,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-10-16 01:54:59,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:59,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 01:54:59,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:54:59,572 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:54:59,573 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:54:59,607 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:59,607 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:54:59,755 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:59,755 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:54:59,755 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [746570273] [2021-10-16 01:54:59,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [746570273] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:54:59,756 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1552131918] [2021-10-16 01:54:59,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:54:59,756 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 01:54:59,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 01:54:59,762 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 01:54:59,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-10-16 01:54:59,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:54:59,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 01:54:59,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:54:59,946 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:54:59,947 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:54:59,965 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:54:59,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:00,015 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:00,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1552131918] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:00,016 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [210736809] [2021-10-16 01:55:00,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:00,017 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:55:00,017 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 01:55:00,019 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 01:55:00,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-10-16 01:55:00,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:00,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 01:55:00,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:00,160 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:00,161 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:55:00,175 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:00,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:00,240 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:00,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [210736809] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:00,240 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 01:55:00,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 9 [2021-10-16 01:55:00,241 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140109012] [2021-10-16 01:55:00,241 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-16 01:55:00,241 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:55:00,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-16 01:55:00,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-10-16 01:55:00,242 INFO L87 Difference]: Start difference. First operand 53 states and 58 transitions. Second operand has 10 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 10 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) [2021-10-16 01:55:01,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:55:01,058 INFO L93 Difference]: Finished difference Result 325 states and 346 transitions. [2021-10-16 01:55:01,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-16 01:55:01,059 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 10 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 7 [2021-10-16 01:55:01,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:55:01,062 INFO L225 Difference]: With dead ends: 325 [2021-10-16 01:55:01,062 INFO L226 Difference]: Without dead ends: 325 [2021-10-16 01:55:01,063 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 440.0ms TimeCoverageRelationStatistics Valid=113, Invalid=229, Unknown=0, NotChecked=0, Total=342 [2021-10-16 01:55:01,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2021-10-16 01:55:01,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 57. [2021-10-16 01:55:01,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 37 states have (on average 1.7837837837837838) internal successors, (66), 56 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) [2021-10-16 01:55:01,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 66 transitions. [2021-10-16 01:55:01,074 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 66 transitions. Word has length 7 [2021-10-16 01:55:01,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:55:01,074 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 66 transitions. [2021-10-16 01:55:01,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 10 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) [2021-10-16 01:55:01,074 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 66 transitions. [2021-10-16 01:55:01,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-10-16 01:55:01,075 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:55:01,075 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:55:01,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:01,291 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (5)] Ended with exit code 0 [2021-10-16 01:55:01,496 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:01,690 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 01:55:01,690 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:55:01,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:55:01,691 INFO L82 PathProgramCache]: Analyzing trace with hash 239563854, now seen corresponding path program 1 times [2021-10-16 01:55:01,691 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:55:01,692 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1583344804] [2021-10-16 01:55:01,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:01,692 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:55:01,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:55:01,693 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:55:01,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-10-16 01:55:01,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:01,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 2 conjunts are in the unsatisfiable core [2021-10-16 01:55:01,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:01,844 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-10-16 01:55:01,845 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 1 case distinctions, treesize of input 9 treesize of output 14 [2021-10-16 01:55:01,887 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:01,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:01,915 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:01,915 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:55:01,915 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1583344804] [2021-10-16 01:55:01,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1583344804] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 01:55:01,916 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-16 01:55:01,916 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-10-16 01:55:01,916 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832293795] [2021-10-16 01:55:01,917 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-16 01:55:01,917 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:55:01,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-16 01:55:01,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-16 01:55:01,918 INFO L87 Difference]: Start difference. First operand 57 states and 66 transitions. Second operand has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:01,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:55:01,980 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2021-10-16 01:55:01,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-16 01:55:01,980 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 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 8 [2021-10-16 01:55:01,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:55:01,982 INFO L225 Difference]: With dead ends: 54 [2021-10-16 01:55:01,982 INFO L226 Difference]: Without dead ends: 54 [2021-10-16 01:55:01,983 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-16 01:55:01,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-10-16 01:55:01,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-10-16 01:55:01,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 37 states have (on average 1.7027027027027026) internal successors, (63), 53 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:01,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2021-10-16 01:55:01,988 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 8 [2021-10-16 01:55:01,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:55:01,988 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2021-10-16 01:55:01,988 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:01,988 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2021-10-16 01:55:01,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-10-16 01:55:01,989 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:55:01,989 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:55:02,008 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:02,208 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 01:55:02,209 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:55:02,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:55:02,209 INFO L82 PathProgramCache]: Analyzing trace with hash 239563855, now seen corresponding path program 1 times [2021-10-16 01:55:02,209 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:55:02,209 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1297992684] [2021-10-16 01:55:02,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:02,210 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:55:02,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:55:02,211 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:55:02,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-10-16 01:55:02,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:02,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-16 01:55:02,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:02,325 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:02,325 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:55:02,407 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:02,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:02,684 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:02,684 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:55:02,684 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1297992684] [2021-10-16 01:55:02,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1297992684] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 01:55:02,685 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-16 01:55:02,685 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2021-10-16 01:55:02,685 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653242589] [2021-10-16 01:55:02,685 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-16 01:55:02,686 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:55:02,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-16 01:55:02,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-10-16 01:55:02,687 INFO L87 Difference]: Start difference. First operand 54 states and 63 transitions. Second operand has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:03,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:55:03,701 INFO L93 Difference]: Finished difference Result 172 states and 186 transitions. [2021-10-16 01:55:03,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-16 01:55:03,703 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 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 8 [2021-10-16 01:55:03,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:55:03,704 INFO L225 Difference]: With dead ends: 172 [2021-10-16 01:55:03,704 INFO L226 Difference]: Without dead ends: 172 [2021-10-16 01:55:03,705 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 352.0ms TimeCoverageRelationStatistics Valid=57, Invalid=99, Unknown=0, NotChecked=0, Total=156 [2021-10-16 01:55:03,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-10-16 01:55:03,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 73. [2021-10-16 01:55:03,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 56 states have (on average 1.5714285714285714) internal successors, (88), 72 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:03,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 88 transitions. [2021-10-16 01:55:03,712 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 88 transitions. Word has length 8 [2021-10-16 01:55:03,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:55:03,712 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 88 transitions. [2021-10-16 01:55:03,712 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:03,712 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 88 transitions. [2021-10-16 01:55:03,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-16 01:55:03,713 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:55:03,713 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:55:03,728 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:03,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 01:55:03,925 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:55:03,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:55:03,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1976198929, now seen corresponding path program 1 times [2021-10-16 01:55:03,925 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:55:03,925 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [3136247] [2021-10-16 01:55:03,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:03,926 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:55:03,926 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:55:03,927 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:55:03,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-10-16 01:55:04,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:04,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-16 01:55:04,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:04,098 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:04,099 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:55:04,176 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:04,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:04,501 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:04,502 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:55:04,502 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [3136247] [2021-10-16 01:55:04,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [3136247] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:04,502 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [579409586] [2021-10-16 01:55:04,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:04,503 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 01:55:04,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 01:55:04,516 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 01:55:04,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-10-16 01:55:04,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:04,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-16 01:55:04,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:04,719 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:04,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 21 [2021-10-16 01:55:04,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2021-10-16 01:55:04,945 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:04,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:05,075 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:05,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [579409586] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:05,075 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [356933030] [2021-10-16 01:55:05,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:05,075 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:55:05,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 01:55:05,077 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 01:55:05,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-10-16 01:55:05,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:05,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-16 01:55:05,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:05,239 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:05,239 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:55:05,294 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:05,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:05,426 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:05,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [356933030] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:05,427 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 01:55:05,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 13 [2021-10-16 01:55:05,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640384886] [2021-10-16 01:55:05,427 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-10-16 01:55:05,428 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:55:05,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-16 01:55:05,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-10-16 01:55:05,428 INFO L87 Difference]: Start difference. First operand 73 states and 88 transitions. Second operand has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:07,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:55:07,822 INFO L93 Difference]: Finished difference Result 489 states and 519 transitions. [2021-10-16 01:55:07,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-10-16 01:55:07,823 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 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 10 [2021-10-16 01:55:07,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:55:07,825 INFO L225 Difference]: With dead ends: 489 [2021-10-16 01:55:07,826 INFO L226 Difference]: Without dead ends: 489 [2021-10-16 01:55:07,829 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 1070.8ms TimeCoverageRelationStatistics Valid=242, Invalid=628, Unknown=0, NotChecked=0, Total=870 [2021-10-16 01:55:07,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 489 states. [2021-10-16 01:55:07,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 489 to 87. [2021-10-16 01:55:07,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 70 states have (on average 1.542857142857143) internal successors, (108), 86 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) [2021-10-16 01:55:07,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 108 transitions. [2021-10-16 01:55:07,840 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 108 transitions. Word has length 10 [2021-10-16 01:55:07,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:55:07,840 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 108 transitions. [2021-10-16 01:55:07,841 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:07,841 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 108 transitions. [2021-10-16 01:55:07,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-16 01:55:07,842 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:55:07,842 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:55:07,873 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:08,069 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:08,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:08,462 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt [2021-10-16 01:55:08,462 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:55:08,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:55:08,463 INFO L82 PathProgramCache]: Analyzing trace with hash -1388869610, now seen corresponding path program 1 times [2021-10-16 01:55:08,463 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:55:08,463 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1043208789] [2021-10-16 01:55:08,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:08,463 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:55:08,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:55:08,464 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:55:08,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-10-16 01:55:08,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:08,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 01:55:08,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:08,640 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:08,641 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:08,706 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:08,706 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:55:08,706 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1043208789] [2021-10-16 01:55:08,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1043208789] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:08,707 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1974184327] [2021-10-16 01:55:08,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:08,707 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 01:55:08,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 01:55:08,712 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 01:55:08,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-10-16 01:55:08,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:08,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 01:55:08,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:08,939 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:08,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:08,985 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:08,985 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1974184327] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:08,985 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1549130340] [2021-10-16 01:55:08,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:08,985 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:55:08,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 01:55:08,988 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 01:55:08,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-10-16 01:55:09,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:09,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 01:55:09,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:09,182 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:09,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:09,231 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:09,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1549130340] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:09,231 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 01:55:09,231 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-10-16 01:55:09,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104714306] [2021-10-16 01:55:09,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-16 01:55:09,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:55:09,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-16 01:55:09,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-10-16 01:55:09,232 INFO L87 Difference]: Start difference. First operand 87 states and 108 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 8 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) [2021-10-16 01:55:09,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:55:09,332 INFO L93 Difference]: Finished difference Result 113 states and 132 transitions. [2021-10-16 01:55:09,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-16 01:55:09,336 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 8 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 11 [2021-10-16 01:55:09,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:55:09,337 INFO L225 Difference]: With dead ends: 113 [2021-10-16 01:55:09,337 INFO L226 Difference]: Without dead ends: 113 [2021-10-16 01:55:09,338 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 41.9ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-10-16 01:55:09,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-10-16 01:55:09,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 86. [2021-10-16 01:55:09,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 69 states have (on average 1.5217391304347827) internal successors, (105), 85 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) [2021-10-16 01:55:09,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 105 transitions. [2021-10-16 01:55:09,343 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 105 transitions. Word has length 11 [2021-10-16 01:55:09,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:55:09,344 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 105 transitions. [2021-10-16 01:55:09,344 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 8 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) [2021-10-16 01:55:09,344 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 105 transitions. [2021-10-16 01:55:09,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-16 01:55:09,345 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:55:09,345 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:55:09,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:09,578 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:09,776 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (13)] Ended with exit code 0 [2021-10-16 01:55:09,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt [2021-10-16 01:55:09,972 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:55:09,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:55:09,972 INFO L82 PathProgramCache]: Analyzing trace with hash 738364296, now seen corresponding path program 1 times [2021-10-16 01:55:09,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:55:09,973 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [642402727] [2021-10-16 01:55:09,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:09,973 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:55:09,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:55:09,974 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:55:09,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-10-16 01:55:10,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:10,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 01:55:10,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:10,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:10,137 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:10,207 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:10,207 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:55:10,207 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [642402727] [2021-10-16 01:55:10,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [642402727] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:10,208 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1457299831] [2021-10-16 01:55:10,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:10,208 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 01:55:10,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 01:55:10,209 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 01:55:10,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-10-16 01:55:10,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:10,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 01:55:10,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:10,455 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:10,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:10,500 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:10,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1457299831] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:10,501 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602132208] [2021-10-16 01:55:10,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:10,501 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:55:10,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 01:55:10,502 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 01:55:10,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-10-16 01:55:10,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:10,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-16 01:55:10,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:10,670 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-10-16 01:55:10,671 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 1 case distinctions, treesize of input 9 treesize of output 14 [2021-10-16 01:55:10,715 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 01:55:10,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:10,745 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 01:55:10,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1602132208] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 01:55:10,746 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2021-10-16 01:55:10,746 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5, 5, 5] total 9 [2021-10-16 01:55:10,746 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306657978] [2021-10-16 01:55:10,747 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-16 01:55:10,747 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:55:10,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-16 01:55:10,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-10-16 01:55:10,748 INFO L87 Difference]: Start difference. First operand 86 states and 105 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) [2021-10-16 01:55:10,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:55:10,800 INFO L93 Difference]: Finished difference Result 84 states and 101 transitions. [2021-10-16 01:55:10,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-16 01:55:10,801 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 [2021-10-16 01:55:10,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:55:10,802 INFO L225 Difference]: With dead ends: 84 [2021-10-16 01:55:10,802 INFO L226 Difference]: Without dead ends: 84 [2021-10-16 01:55:10,802 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 48.3ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-10-16 01:55:10,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-10-16 01:55:10,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2021-10-16 01:55:10,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 69 states have (on average 1.463768115942029) internal successors, (101), 83 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:10,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 101 transitions. [2021-10-16 01:55:10,807 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 101 transitions. Word has length 11 [2021-10-16 01:55:10,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:55:10,808 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 101 transitions. [2021-10-16 01:55:10,808 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) [2021-10-16 01:55:10,808 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 101 transitions. [2021-10-16 01:55:10,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-16 01:55:10,809 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:55:10,809 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:55:10,847 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:11,026 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:11,221 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:11,420 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt [2021-10-16 01:55:11,420 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:55:11,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:55:11,420 INFO L82 PathProgramCache]: Analyzing trace with hash 738364297, now seen corresponding path program 1 times [2021-10-16 01:55:11,421 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:55:11,421 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1204548396] [2021-10-16 01:55:11,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:11,421 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:55:11,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:55:11,422 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:55:11,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-10-16 01:55:11,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:11,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 01:55:11,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:11,590 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:11,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:11,641 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:11,641 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:55:11,641 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1204548396] [2021-10-16 01:55:11,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1204548396] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:11,642 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [832503209] [2021-10-16 01:55:11,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:11,642 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 01:55:11,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 01:55:11,651 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 01:55:11,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-10-16 01:55:11,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:11,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 01:55:11,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:11,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:11,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:11,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:11,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [832503209] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:11,969 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326709055] [2021-10-16 01:55:11,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:11,969 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:55:11,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 01:55:11,976 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 01:55:11,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-10-16 01:55:12,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:12,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-16 01:55:12,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:12,187 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:12,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:12,251 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:12,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [326709055] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:12,252 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 01:55:12,252 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 10 [2021-10-16 01:55:12,252 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924382125] [2021-10-16 01:55:12,252 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-16 01:55:12,253 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:55:12,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-16 01:55:12,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-10-16 01:55:12,254 INFO L87 Difference]: Start difference. First operand 84 states and 101 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:12,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:55:12,780 INFO L93 Difference]: Finished difference Result 164 states and 181 transitions. [2021-10-16 01:55:12,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-10-16 01:55:12,781 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 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 [2021-10-16 01:55:12,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:55:12,782 INFO L225 Difference]: With dead ends: 164 [2021-10-16 01:55:12,782 INFO L226 Difference]: Without dead ends: 164 [2021-10-16 01:55:12,782 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 230.4ms TimeCoverageRelationStatistics Valid=82, Invalid=158, Unknown=0, NotChecked=0, Total=240 [2021-10-16 01:55:12,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-10-16 01:55:12,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 89. [2021-10-16 01:55:12,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 74 states have (on average 1.4189189189189189) internal successors, (105), 88 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) [2021-10-16 01:55:12,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 105 transitions. [2021-10-16 01:55:12,787 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 105 transitions. Word has length 11 [2021-10-16 01:55:12,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:55:12,787 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 105 transitions. [2021-10-16 01:55:12,788 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:12,788 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 105 transitions. [2021-10-16 01:55:12,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-16 01:55:12,789 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:55:12,789 INFO L512 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1] [2021-10-16 01:55:12,799 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:12,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:13,213 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-10-16 01:55:13,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:55:13,390 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:55:13,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:55:13,390 INFO L82 PathProgramCache]: Analyzing trace with hash 522992425, now seen corresponding path program 2 times [2021-10-16 01:55:13,391 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:55:13,391 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [340942599] [2021-10-16 01:55:13,391 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-16 01:55:13,391 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:55:13,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:55:13,392 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:55:13,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-10-16 01:55:13,529 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-16 01:55:13,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 01:55:13,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-16 01:55:13,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:13,618 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:13,618 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:55:13,652 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:13,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:13,894 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:13,894 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:55:13,894 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [340942599] [2021-10-16 01:55:13,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [340942599] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:13,895 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1249998396] [2021-10-16 01:55:13,895 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-16 01:55:13,895 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 01:55:13,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 01:55:13,896 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 01:55:13,897 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-10-16 01:55:14,127 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-16 01:55:14,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 01:55:14,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-16 01:55:14,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:14,198 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:14,198 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:55:14,206 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:14,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:14,266 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:14,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1249998396] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:14,266 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1276213111] [2021-10-16 01:55:14,266 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-16 01:55:14,267 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:55:14,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 01:55:14,267 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 01:55:14,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-10-16 01:55:14,466 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-16 01:55:14,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 01:55:14,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-16 01:55:14,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:14,517 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:14,517 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:55:14,525 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:14,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:14,585 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:14,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1276213111] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:14,585 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 01:55:14,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 17 [2021-10-16 01:55:14,588 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493430015] [2021-10-16 01:55:14,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-10-16 01:55:14,590 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:55:14,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-10-16 01:55:14,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2021-10-16 01:55:14,591 INFO L87 Difference]: Start difference. First operand 89 states and 105 transitions. Second operand has 18 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 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) [2021-10-16 01:55:16,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:55:16,538 INFO L93 Difference]: Finished difference Result 682 states and 734 transitions. [2021-10-16 01:55:16,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-10-16 01:55:16,539 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 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 11 [2021-10-16 01:55:16,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:55:16,543 INFO L225 Difference]: With dead ends: 682 [2021-10-16 01:55:16,543 INFO L226 Difference]: Without dead ends: 682 [2021-10-16 01:55:16,544 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1188.6ms TimeCoverageRelationStatistics Valid=463, Invalid=1019, Unknown=0, NotChecked=0, Total=1482 [2021-10-16 01:55:16,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 682 states. [2021-10-16 01:55:16,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 682 to 99. [2021-10-16 01:55:16,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 84 states have (on average 1.4642857142857142) internal successors, (123), 98 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:16,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 123 transitions. [2021-10-16 01:55:16,552 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 123 transitions. Word has length 11 [2021-10-16 01:55:16,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:55:16,553 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 123 transitions. [2021-10-16 01:55:16,553 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 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) [2021-10-16 01:55:16,553 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 123 transitions. [2021-10-16 01:55:16,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-10-16 01:55:16,554 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:55:16,554 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:55:16,570 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:16,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:16,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:17,165 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:55:17,166 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:55:17,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:55:17,166 INFO L82 PathProgramCache]: Analyzing trace with hash 1416054993, now seen corresponding path program 1 times [2021-10-16 01:55:17,166 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:55:17,166 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [741566167] [2021-10-16 01:55:17,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:17,167 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:55:17,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:55:17,169 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:55:17,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-10-16 01:55:17,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:17,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-16 01:55:17,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:17,380 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:17,380 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:55:17,516 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:17,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:17,990 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:17,990 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:55:17,990 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [741566167] [2021-10-16 01:55:17,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [741566167] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:17,990 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [257005988] [2021-10-16 01:55:17,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:17,991 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 01:55:17,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 01:55:17,992 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 01:55:18,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-10-16 01:55:18,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:18,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-16 01:55:18,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:18,306 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:18,307 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 1 case distinctions, treesize of input 20 treesize of output 21 [2021-10-16 01:55:18,310 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2021-10-16 01:55:18,566 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:18,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:18,744 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:18,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [257005988] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:18,744 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1722205452] [2021-10-16 01:55:18,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:18,745 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:55:18,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 01:55:18,752 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 01:55:18,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-10-16 01:55:18,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:18,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-16 01:55:18,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:19,004 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:19,004 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:55:19,082 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:19,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:19,607 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:19,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1722205452] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:19,608 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 01:55:19,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 7] total 18 [2021-10-16 01:55:19,608 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102939706] [2021-10-16 01:55:19,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-10-16 01:55:19,609 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:55:19,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-10-16 01:55:19,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-10-16 01:55:19,612 INFO L87 Difference]: Start difference. First operand 99 states and 123 transitions. Second operand has 19 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 19 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:25,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:55:25,201 INFO L93 Difference]: Finished difference Result 364 states and 394 transitions. [2021-10-16 01:55:25,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-10-16 01:55:25,202 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 19 states have internal predecessors, (39), 0 states have call successors, (0), 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 12 [2021-10-16 01:55:25,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:55:25,204 INFO L225 Difference]: With dead ends: 364 [2021-10-16 01:55:25,204 INFO L226 Difference]: Without dead ends: 364 [2021-10-16 01:55:25,205 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 2932.9ms TimeCoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2021-10-16 01:55:25,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2021-10-16 01:55:25,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 128. [2021-10-16 01:55:25,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 113 states have (on average 1.3982300884955752) internal successors, (158), 127 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:25,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 158 transitions. [2021-10-16 01:55:25,212 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 158 transitions. Word has length 12 [2021-10-16 01:55:25,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:55:25,212 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 158 transitions. [2021-10-16 01:55:25,212 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 19 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:25,213 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 158 transitions. [2021-10-16 01:55:25,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-10-16 01:55:25,214 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:55:25,214 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:55:25,225 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:25,426 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (25)] Ended with exit code 0 [2021-10-16 01:55:25,645 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:25,825 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:55:25,825 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:55:25,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:55:25,826 INFO L82 PathProgramCache]: Analyzing trace with hash 1031081387, now seen corresponding path program 1 times [2021-10-16 01:55:25,826 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:55:25,826 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1968843194] [2021-10-16 01:55:25,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:25,826 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:55:25,826 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:55:25,827 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:55:25,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-10-16 01:55:26,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:26,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 01:55:26,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:26,090 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:26,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:55:26,173 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 01:55:26,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:26,299 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 01:55:26,299 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:55:26,299 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1968843194] [2021-10-16 01:55:26,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1968843194] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 01:55:26,299 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-16 01:55:26,299 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-10-16 01:55:26,299 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863606847] [2021-10-16 01:55:26,300 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-16 01:55:26,300 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:55:26,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-16 01:55:26,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-16 01:55:26,300 INFO L87 Difference]: Start difference. First operand 128 states and 158 transitions. Second operand has 6 states, 5 states have (on average 5.0) 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) [2021-10-16 01:55:26,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:55:26,476 INFO L93 Difference]: Finished difference Result 148 states and 173 transitions. [2021-10-16 01:55:26,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-16 01:55:26,477 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.0) 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 13 [2021-10-16 01:55:26,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:55:26,478 INFO L225 Difference]: With dead ends: 148 [2021-10-16 01:55:26,478 INFO L226 Difference]: Without dead ends: 148 [2021-10-16 01:55:26,478 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 60.9ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-10-16 01:55:26,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-10-16 01:55:26,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 118. [2021-10-16 01:55:26,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 108 states have (on average 1.3611111111111112) internal successors, (147), 117 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) [2021-10-16 01:55:26,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 147 transitions. [2021-10-16 01:55:26,483 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 147 transitions. Word has length 13 [2021-10-16 01:55:26,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:55:26,483 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 147 transitions. [2021-10-16 01:55:26,483 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.0) 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) [2021-10-16 01:55:26,483 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 147 transitions. [2021-10-16 01:55:26,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-10-16 01:55:26,484 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:55:26,485 INFO L512 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:55:26,507 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (27)] Ended with exit code 0 [2021-10-16 01:55:26,696 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 01:55:26,696 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:55:26,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:55:26,696 INFO L82 PathProgramCache]: Analyzing trace with hash -1674057169, now seen corresponding path program 2 times [2021-10-16 01:55:26,697 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:55:26,697 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [203424138] [2021-10-16 01:55:26,697 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-16 01:55:26,697 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:55:26,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:55:26,698 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:55:26,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-10-16 01:55:26,904 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-10-16 01:55:26,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 01:55:26,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 01:55:26,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:26,959 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-10-16 01:55:26,959 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 1 case distinctions, treesize of input 13 treesize of output 15 [2021-10-16 01:55:27,144 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-10-16 01:55:27,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:27,438 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-10-16 01:55:27,439 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:55:27,439 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [203424138] [2021-10-16 01:55:27,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [203424138] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 01:55:27,439 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-16 01:55:27,439 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2021-10-16 01:55:27,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140410880] [2021-10-16 01:55:27,439 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-16 01:55:27,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:55:27,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-16 01:55:27,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-10-16 01:55:27,441 INFO L87 Difference]: Start difference. First operand 118 states and 147 transitions. Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:27,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:55:27,826 INFO L93 Difference]: Finished difference Result 136 states and 164 transitions. [2021-10-16 01:55:27,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-16 01:55:27,827 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 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 14 [2021-10-16 01:55:27,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:55:27,828 INFO L225 Difference]: With dead ends: 136 [2021-10-16 01:55:27,828 INFO L226 Difference]: Without dead ends: 136 [2021-10-16 01:55:27,828 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 296.1ms TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2021-10-16 01:55:27,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-10-16 01:55:27,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 91. [2021-10-16 01:55:27,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 83 states have (on average 1.3614457831325302) internal successors, (113), 90 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:27,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 113 transitions. [2021-10-16 01:55:27,832 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 113 transitions. Word has length 14 [2021-10-16 01:55:27,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:55:27,832 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 113 transitions. [2021-10-16 01:55:27,832 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:27,832 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 113 transitions. [2021-10-16 01:55:27,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-10-16 01:55:27,833 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:55:27,833 INFO L512 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:55:27,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:28,043 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 01:55:28,044 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:55:28,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:55:28,044 INFO L82 PathProgramCache]: Analyzing trace with hash 525487188, now seen corresponding path program 2 times [2021-10-16 01:55:28,044 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:55:28,045 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [457544133] [2021-10-16 01:55:28,045 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-16 01:55:28,045 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:55:28,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:55:28,046 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:55:28,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-10-16 01:55:28,280 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-16 01:55:28,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 01:55:28,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 01:55:28,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:28,387 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:28,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:28,486 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:28,487 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:55:28,487 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [457544133] [2021-10-16 01:55:28,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [457544133] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:28,487 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2087579213] [2021-10-16 01:55:28,487 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-16 01:55:28,487 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 01:55:28,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 01:55:28,488 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 01:55:28,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-10-16 01:55:28,832 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-16 01:55:28,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 01:55:28,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 01:55:28,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:28,913 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:28,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:28,971 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:28,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2087579213] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:28,971 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [162469875] [2021-10-16 01:55:28,972 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-16 01:55:28,972 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:55:28,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 01:55:28,977 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 01:55:28,977 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-10-16 01:55:29,303 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-16 01:55:29,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 01:55:29,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-16 01:55:29,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:29,375 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:29,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:29,437 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:29,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [162469875] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:29,437 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 01:55:29,438 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 12 [2021-10-16 01:55:29,438 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451001883] [2021-10-16 01:55:29,438 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-16 01:55:29,438 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:55:29,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-16 01:55:29,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-10-16 01:55:29,439 INFO L87 Difference]: Start difference. First operand 91 states and 113 transitions. Second operand has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 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) [2021-10-16 01:55:29,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:55:29,674 INFO L93 Difference]: Finished difference Result 113 states and 127 transitions. [2021-10-16 01:55:29,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-10-16 01:55:29,675 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 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 15 [2021-10-16 01:55:29,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:55:29,676 INFO L225 Difference]: With dead ends: 113 [2021-10-16 01:55:29,676 INFO L226 Difference]: Without dead ends: 113 [2021-10-16 01:55:29,676 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 124.9ms TimeCoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2021-10-16 01:55:29,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-10-16 01:55:29,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 84. [2021-10-16 01:55:29,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 76 states have (on average 1.3289473684210527) internal successors, (101), 83 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:29,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 101 transitions. [2021-10-16 01:55:29,679 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 101 transitions. Word has length 15 [2021-10-16 01:55:29,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:55:29,680 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 101 transitions. [2021-10-16 01:55:29,680 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 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) [2021-10-16 01:55:29,680 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 101 transitions. [2021-10-16 01:55:29,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-10-16 01:55:29,681 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:55:29,681 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:55:29,690 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:29,889 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (30)] Ended with exit code 0 [2021-10-16 01:55:30,108 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:30,288 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:55:30,288 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:55:30,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:55:30,288 INFO L82 PathProgramCache]: Analyzing trace with hash -660488896, now seen corresponding path program 1 times [2021-10-16 01:55:30,289 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:55:30,289 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2095007059] [2021-10-16 01:55:30,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:55:30,289 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:55:30,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:55:30,290 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:55:30,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-10-16 01:55:30,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:55:30,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 2 conjunts are in the unsatisfiable core [2021-10-16 01:55:30,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:30,574 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 01:55:30,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:30,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-16 01:55:30,615 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:55:30,615 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2095007059] [2021-10-16 01:55:30,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2095007059] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-16 01:55:30,615 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-16 01:55:30,615 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-10-16 01:55:30,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680819792] [2021-10-16 01:55:30,615 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-16 01:55:30,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:55:30,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-16 01:55:30,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-16 01:55:30,616 INFO L87 Difference]: Start difference. First operand 84 states and 101 transitions. Second operand has 3 states, 2 states have (on average 8.0) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:30,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:55:30,657 INFO L93 Difference]: Finished difference Result 82 states and 99 transitions. [2021-10-16 01:55:30,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-16 01:55:30,658 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 8.0) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 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 [2021-10-16 01:55:30,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:55:30,659 INFO L225 Difference]: With dead ends: 82 [2021-10-16 01:55:30,659 INFO L226 Difference]: Without dead ends: 82 [2021-10-16 01:55:30,659 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-16 01:55:30,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-10-16 01:55:30,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-10-16 01:55:30,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 76 states have (on average 1.3026315789473684) internal successors, (99), 81 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:30,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 99 transitions. [2021-10-16 01:55:30,669 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 99 transitions. Word has length 16 [2021-10-16 01:55:30,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:55:30,669 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 99 transitions. [2021-10-16 01:55:30,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 8.0) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:30,669 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 99 transitions. [2021-10-16 01:55:30,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-10-16 01:55:30,670 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:55:30,670 INFO L512 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:55:30,684 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:30,882 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 01:55:30,883 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:55:30,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:55:30,883 INFO L82 PathProgramCache]: Analyzing trace with hash 854407055, now seen corresponding path program 3 times [2021-10-16 01:55:30,883 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:55:30,883 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1273646066] [2021-10-16 01:55:30,883 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-16 01:55:30,884 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:55:30,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:55:30,884 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:55:30,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-10-16 01:55:31,137 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-16 01:55:31,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 01:55:31,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 11 conjunts are in the unsatisfiable core [2021-10-16 01:55:31,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:31,178 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:31,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:55:31,346 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:31,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:32,705 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:32,706 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:55:32,706 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1273646066] [2021-10-16 01:55:32,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1273646066] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:32,706 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [134097445] [2021-10-16 01:55:32,706 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-16 01:55:32,706 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 01:55:32,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 01:55:32,707 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 01:55:32,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-10-16 01:55:33,100 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-16 01:55:33,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 01:55:33,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-16 01:55:33,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:33,150 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:33,150 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 1 case distinctions, treesize of input 21 treesize of output 22 [2021-10-16 01:55:33,156 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 23 treesize of output 21 [2021-10-16 01:55:33,538 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:33,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:34,054 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:34,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [134097445] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:34,054 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962580127] [2021-10-16 01:55:34,054 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-16 01:55:34,054 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:55:34,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 01:55:34,055 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 01:55:34,056 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-10-16 01:55:34,398 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-16 01:55:34,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 01:55:34,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-16 01:55:34,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:34,431 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:34,432 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:55:34,520 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:34,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:35,293 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:35,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962580127] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:35,293 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 01:55:35,293 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 8, 9, 8, 9] total 23 [2021-10-16 01:55:35,293 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133547148] [2021-10-16 01:55:35,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-10-16 01:55:35,294 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:55:35,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-10-16 01:55:35,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2021-10-16 01:55:35,295 INFO L87 Difference]: Start difference. First operand 82 states and 99 transitions. Second operand has 24 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 24 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) [2021-10-16 01:55:49,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:55:49,069 INFO L93 Difference]: Finished difference Result 315 states and 339 transitions. [2021-10-16 01:55:49,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-10-16 01:55:49,069 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 24 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 16 [2021-10-16 01:55:49,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:55:49,071 INFO L225 Difference]: With dead ends: 315 [2021-10-16 01:55:49,071 INFO L226 Difference]: Without dead ends: 315 [2021-10-16 01:55:49,072 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 988 ImplicationChecksByTransitivity, 7650.6ms TimeCoverageRelationStatistics Valid=711, Invalid=2829, Unknown=0, NotChecked=0, Total=3540 [2021-10-16 01:55:49,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2021-10-16 01:55:49,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 124. [2021-10-16 01:55:49,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 118 states have (on average 1.2796610169491525) internal successors, (151), 123 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:55:49,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 151 transitions. [2021-10-16 01:55:49,078 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 151 transitions. Word has length 16 [2021-10-16 01:55:49,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:55:49,079 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 151 transitions. [2021-10-16 01:55:49,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 24 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) [2021-10-16 01:55:49,079 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 151 transitions. [2021-10-16 01:55:49,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-10-16 01:55:49,080 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:55:49,080 INFO L512 BasicCegarLoop]: trace histogram [5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:55:49,093 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-10-16 01:55:49,312 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-10-16 01:55:49,493 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (34)] Ended with exit code 0 [2021-10-16 01:55:49,692 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt [2021-10-16 01:55:49,692 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:55:49,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:55:49,692 INFO L82 PathProgramCache]: Analyzing trace with hash -283489775, now seen corresponding path program 4 times [2021-10-16 01:55:49,692 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:55:49,693 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1485454563] [2021-10-16 01:55:49,693 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-16 01:55:49,693 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:55:49,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:55:49,694 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:55:49,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-10-16 01:55:50,137 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-16 01:55:50,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 01:55:50,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 11 conjunts are in the unsatisfiable core [2021-10-16 01:55:50,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:50,204 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:50,205 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:55:50,341 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:50,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:51,028 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:51,028 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:55:51,028 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1485454563] [2021-10-16 01:55:51,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1485454563] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:51,028 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1264644052] [2021-10-16 01:55:51,028 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-16 01:55:51,028 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 01:55:51,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 01:55:51,030 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 01:55:51,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-10-16 01:55:51,525 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-16 01:55:51,525 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 01:55:51,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-16 01:55:51,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:51,564 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:51,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 21 [2021-10-16 01:55:51,567 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2021-10-16 01:55:51,827 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:51,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:52,005 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:52,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1264644052] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:52,005 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [123755316] [2021-10-16 01:55:52,006 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-16 01:55:52,006 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:55:52,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 01:55:52,006 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 01:55:52,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-10-16 01:55:52,392 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-16 01:55:52,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-16 01:55:52,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-16 01:55:52,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:55:52,435 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:55:52,436 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:55:52,520 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:52,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:55:53,489 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-16 01:55:53,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [123755316] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:55:53,489 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 01:55:53,489 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10, 11] total 30 [2021-10-16 01:55:53,490 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871067887] [2021-10-16 01:55:53,490 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-10-16 01:55:53,490 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:55:53,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-10-16 01:55:53,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=755, Unknown=0, NotChecked=0, Total=930 [2021-10-16 01:55:53,492 INFO L87 Difference]: Start difference. First operand 124 states and 151 transitions. Second operand has 31 states, 30 states have (on average 1.7) internal successors, (51), 31 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) [2021-10-16 01:56:18,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:56:18,863 INFO L93 Difference]: Finished difference Result 674 states and 706 transitions. [2021-10-16 01:56:18,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-10-16 01:56:18,864 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.7) internal successors, (51), 31 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) Word has length 16 [2021-10-16 01:56:18,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:56:18,867 INFO L225 Difference]: With dead ends: 674 [2021-10-16 01:56:18,867 INFO L226 Difference]: Without dead ends: 674 [2021-10-16 01:56:18,879 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2743 ImplicationChecksByTransitivity, 13140.4ms TimeCoverageRelationStatistics Valid=2257, Invalid=7055, Unknown=0, NotChecked=0, Total=9312 [2021-10-16 01:56:18,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 674 states. [2021-10-16 01:56:18,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 674 to 144. [2021-10-16 01:56:18,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 138 states have (on average 1.2681159420289856) internal successors, (175), 143 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) [2021-10-16 01:56:18,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 175 transitions. [2021-10-16 01:56:18,904 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 175 transitions. Word has length 16 [2021-10-16 01:56:18,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:56:18,905 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 175 transitions. [2021-10-16 01:56:18,905 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.7) internal successors, (51), 31 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) [2021-10-16 01:56:18,905 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 175 transitions. [2021-10-16 01:56:18,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-10-16 01:56:18,906 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:56:18,906 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:56:18,932 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-10-16 01:56:19,127 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (36)] Ended with exit code 0 [2021-10-16 01:56:19,322 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (37)] Forceful destruction successful, exit code 0 [2021-10-16 01:56:19,520 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt [2021-10-16 01:56:19,520 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:56:19,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:56:19,520 INFO L82 PathProgramCache]: Analyzing trace with hash -1813005665, now seen corresponding path program 1 times [2021-10-16 01:56:19,521 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:56:19,521 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1456887330] [2021-10-16 01:56:19,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:56:19,521 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:56:19,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:56:19,522 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:56:19,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-10-16 01:56:19,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:56:19,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-16 01:56:19,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:56:19,892 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:56:19,893 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:56:20,015 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-16 01:56:20,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:56:20,359 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-16 01:56:20,361 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-16 01:56:20,361 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1456887330] [2021-10-16 01:56:20,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1456887330] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:56:20,361 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [206172094] [2021-10-16 01:56:20,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:56:20,361 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-16 01:56:20,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 [2021-10-16 01:56:20,362 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-16 01:56:20,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-10-16 01:56:20,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:56:20,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-16 01:56:20,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:56:20,895 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:56:20,895 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:56:20,978 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-16 01:56:20,978 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:56:21,134 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-16 01:56:21,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [206172094] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:56:21,134 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026096783] [2021-10-16 01:56:21,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:56:21,134 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:56:21,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 [2021-10-16 01:56:21,135 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-16 01:56:21,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-10-16 01:56:21,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-16 01:56:21,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-16 01:56:21,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-16 01:56:21,759 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-16 01:56:21,759 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 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-16 01:56:21,852 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-16 01:56:21,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-16 01:56:22,028 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-16 01:56:22,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1026096783] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-16 01:56:22,028 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-16 01:56:22,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 9 [2021-10-16 01:56:22,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645648505] [2021-10-16 01:56:22,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-16 01:56:22,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-16 01:56:22,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-16 01:56:22,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-10-16 01:56:22,030 INFO L87 Difference]: Start difference. First operand 144 states and 175 transitions. Second operand has 10 states, 9 states have (on average 3.0) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:56:22,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-16 01:56:22,768 INFO L93 Difference]: Finished difference Result 218 states and 244 transitions. [2021-10-16 01:56:22,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-16 01:56:22,768 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.0) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 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 [2021-10-16 01:56:22,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-16 01:56:22,769 INFO L225 Difference]: With dead ends: 218 [2021-10-16 01:56:22,770 INFO L226 Difference]: Without dead ends: 218 [2021-10-16 01:56:22,770 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 435.1ms TimeCoverageRelationStatistics Valid=81, Invalid=191, Unknown=0, NotChecked=0, Total=272 [2021-10-16 01:56:22,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2021-10-16 01:56:22,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 161. [2021-10-16 01:56:22,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 155 states have (on average 1.2451612903225806) internal successors, (193), 160 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) [2021-10-16 01:56:22,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 193 transitions. [2021-10-16 01:56:22,775 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 193 transitions. Word has length 17 [2021-10-16 01:56:22,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-16 01:56:22,775 INFO L470 AbstractCegarLoop]: Abstraction has 161 states and 193 transitions. [2021-10-16 01:56:22,775 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.0) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-16 01:56:22,775 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 193 transitions. [2021-10-16 01:56:22,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-10-16 01:56:22,776 INFO L504 BasicCegarLoop]: Found error trace [2021-10-16 01:56:22,776 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-16 01:56:22,796 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-10-16 01:56:22,990 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt (40)] Forceful destruction successful, exit code 0 [2021-10-16 01:56:23,209 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2021-10-16 01:56:23,388 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/cvc4 --incremental --print-success --lang smt,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-16 01:56:23,389 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr17ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-16 01:56:23,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-16 01:56:23,389 INFO L82 PathProgramCache]: Analyzing trace with hash 925334210, now seen corresponding path program 1 times [2021-10-16 01:56:23,389 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-16 01:56:23,389 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [572193008] [2021-10-16 01:56:23,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-16 01:56:23,390 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-16 01:56:23,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat [2021-10-16 01:56:23,391 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-16 01:56:23,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-10-16 01:56:23,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-16 01:56:23,782 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-16 01:56:23,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-16 01:56:23,865 INFO L133 FreeRefinementEngine]: Strategy WALRUS found a feasible trace [2021-10-16 01:56:23,865 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-10-16 01:56:23,866 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr17ASSERT_VIOLATIONMEMORY_FREE [2021-10-16 01:56:23,868 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATION [2021-10-16 01:56:23,868 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATION [2021-10-16 01:56:23,868 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2REQUIRES_VIOLATION [2021-10-16 01:56:23,868 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr3REQUIRES_VIOLATION [2021-10-16 01:56:23,869 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr4REQUIRES_VIOLATION [2021-10-16 01:56:23,869 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr5REQUIRES_VIOLATION [2021-10-16 01:56:23,869 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr6REQUIRES_VIOLATION [2021-10-16 01:56:23,869 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr7REQUIRES_VIOLATION [2021-10-16 01:56:23,869 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE [2021-10-16 01:56:23,869 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_FREE [2021-10-16 01:56:23,870 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr10ASSERT_VIOLATIONMEMORY_FREE [2021-10-16 01:56:23,870 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_FREE [2021-10-16 01:56:23,870 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_FREE [2021-10-16 01:56:23,870 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE [2021-10-16 01:56:23,870 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE [2021-10-16 01:56:23,870 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_FREE [2021-10-16 01:56:23,871 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_FREE [2021-10-16 01:56:23,871 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_FREE [2021-10-16 01:56:23,871 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr19ASSERT_VIOLATIONMEMORY_FREE [2021-10-16 01:56:23,871 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr20ASSERT_VIOLATIONMEMORY_LEAK [2021-10-16 01:56:23,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-10-16 01:56:24,093 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/mathsat -unsat_core_generation=3 [2021-10-16 01:56:24,099 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-16 01:56:24,128 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 16.10 01:56:24 BoogieIcfgContainer [2021-10-16 01:56:24,128 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-16 01:56:24,129 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-16 01:56:24,129 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-16 01:56:24,129 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-16 01:56:24,129 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 16.10 01:54:57" (3/4) ... [2021-10-16 01:56:24,131 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-10-16 01:56:24,197 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/witness.graphml [2021-10-16 01:56:24,197 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-16 01:56:24,198 INFO L168 Benchmark]: Toolchain (without parser) took 87598.32 ms. Allocated memory was 48.2 MB in the beginning and 75.5 MB in the end (delta: 27.3 MB). Free memory was 32.6 MB in the beginning and 19.9 MB in the end (delta: 12.7 MB). Peak memory consumption was 39.2 MB. Max. memory is 16.1 GB. [2021-10-16 01:56:24,198 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 48.2 MB. Free memory was 29.5 MB in the beginning and 29.5 MB in the end (delta: 31.8 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-16 01:56:24,199 INFO L168 Benchmark]: CACSL2BoogieTranslator took 446.05 ms. Allocated memory was 48.2 MB in the beginning and 58.7 MB in the end (delta: 10.5 MB). Free memory was 32.5 MB in the beginning and 34.6 MB in the end (delta: -2.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-16 01:56:24,199 INFO L168 Benchmark]: Boogie Procedure Inliner took 49.50 ms. Allocated memory is still 58.7 MB. Free memory was 34.5 MB in the beginning and 32.5 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-16 01:56:24,199 INFO L168 Benchmark]: Boogie Preprocessor took 32.25 ms. Allocated memory is still 58.7 MB. Free memory was 32.5 MB in the beginning and 30.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-16 01:56:24,200 INFO L168 Benchmark]: RCFGBuilder took 573.36 ms. Allocated memory is still 58.7 MB. Free memory was 30.9 MB in the beginning and 30.9 MB in the end (delta: 45.2 kB). Peak memory consumption was 7.6 MB. Max. memory is 16.1 GB. [2021-10-16 01:56:24,200 INFO L168 Benchmark]: TraceAbstraction took 86421.73 ms. Allocated memory was 58.7 MB in the beginning and 75.5 MB in the end (delta: 16.8 MB). Free memory was 30.3 MB in the beginning and 22.5 MB in the end (delta: 7.8 MB). Peak memory consumption was 24.6 MB. Max. memory is 16.1 GB. [2021-10-16 01:56:24,201 INFO L168 Benchmark]: Witness Printer took 68.97 ms. Allocated memory is still 75.5 MB. Free memory was 22.5 MB in the beginning and 19.9 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-16 01:56:24,203 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 48.2 MB. Free memory was 29.5 MB in the beginning and 29.5 MB in the end (delta: 31.8 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 446.05 ms. Allocated memory was 48.2 MB in the beginning and 58.7 MB in the end (delta: 10.5 MB). Free memory was 32.5 MB in the beginning and 34.6 MB in the end (delta: -2.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 49.50 ms. Allocated memory is still 58.7 MB. Free memory was 34.5 MB in the beginning and 32.5 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 32.25 ms. Allocated memory is still 58.7 MB. Free memory was 32.5 MB in the beginning and 30.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 573.36 ms. Allocated memory is still 58.7 MB. Free memory was 30.9 MB in the beginning and 30.9 MB in the end (delta: 45.2 kB). Peak memory consumption was 7.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 86421.73 ms. Allocated memory was 58.7 MB in the beginning and 75.5 MB in the end (delta: 16.8 MB). Free memory was 30.3 MB in the beginning and 22.5 MB in the end (delta: 7.8 MB). Peak memory consumption was 24.6 MB. Max. memory is 16.1 GB. * Witness Printer took 68.97 ms. Allocated memory is still 75.5 MB. Free memory was 22.5 MB in the beginning and 19.9 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 547]: free of unallocated memory possible free of unallocated memory possible We found a FailurePath: [L523] int *a, *b; [L524] int n; VAL [a={0:0}, b={0:0}, n=0] [L536] n = 1 VAL [a={0:0}, b={0:0}, n=1] [L537] COND FALSE !(__VERIFIER_nondet_int() && n < 30) [L540] a = malloc(n * sizeof(*a)) [L541] b = malloc(n * sizeof(*b)) [L542] EXPR b++ VAL [a={3:0}, b={1:4}, n=1] [L542] *b++ = 0 VAL [a={3:0}, b={1:4}, n=1] [L528] int i; [L529] i = 0 VAL [a={3:0}, b={1:4}, n=1] [L529] COND TRUE i < n VAL [a={3:0}, b={1:4}, n=1] [L530] a[i] = -1 VAL [a={3:0}, b={1:4}, n=1] [L529] i++ VAL [a={3:0}, b={1:4}, n=1] [L529] COND FALSE !(i < n) VAL [a={3:0}, b={1:4}, n=1] [L531] i = 0 VAL [a={3:0}, b={1:4}, n=1] [L531] COND FALSE !(i < n - 1) VAL [a={3:0}, b={1:4}, n=1] [L544] b[-1] VAL [a={3:0}, b={1:4}, n=1] [L544] COND FALSE !(b[-1]) [L547] free(a) VAL [a={3:0}, b={1:4}, n=1] [L547] free(a) VAL [a={3:0}, b={1:4}, n=1] [L547] free(a) [L547] free(b) VAL [a={3:0}, b={1:4}, n=1] - UnprovableResult [Line: 542]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 542]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 530]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 530]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 532]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 532]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 544]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 544]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 547]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 547]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 547]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 547]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 547]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 534]: Unable to prove that all allocated memory was freed Unable to prove that all allocated memory was freed Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 52 locations, 21 error locations. Started 1 CEGAR loops. OverallTime: 86319.1ms, OverallIterations: 19, TraceHistogramMax: 6, EmptinessCheckTime: 35.2ms, AutomataDifference: 53687.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 12.6ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 1046 SDtfs, 12453 SDslu, 5030 SDs, 0 SdLazy, 5427 SolverSat, 898 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 28450.6ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1078 GetRequests, 715 SyntacticMatches, 0 SemanticMatches, 363 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4697 ImplicationChecksByTransitivity, 28161.0ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=161occurred in iteration=18, InterpolantAutomatonStates: 307, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 163.1ms AutomataMinimizationTime, 18 MinimizatonAttempts, 2660 StatesRemovedByMinimization, 14 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 323.5ms SsaConstructionTime, 1226.0ms SatisfiabilityAnalysisTime, 14258.9ms InterpolantComputationTime, 498 NumberOfCodeBlocks, 492 NumberOfCodeBlocksAsserted, 53 NumberOfCheckSat, 880 ConstructedInterpolants, 32 QuantifiedInterpolants, 7395 SizeOfPredicates, 105 NumberOfNonLiveVariables, 2214 ConjunctsInSsa, 265 ConjunctsInUnsatCore, 80 InterpolantComputations, 16 PerfectInterpolantSequences, 96/496 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-10-16 01:56:24,260 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da2f6833-1fa0-4a45-9715-29a5d5839673/bin/utaipan-mTDlp9Zugs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...