./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/array03-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/array03-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 00a8f866e26c2e2f6efeb25e7ec6952d97cdca88cd5ba8f7afdfeeef8678b95c --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:20:45,016 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:20:45,019 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:20:45,078 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:20:45,079 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:20:45,086 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:20:45,091 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:20:45,097 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:20:45,101 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:20:45,111 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:20:45,113 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:20:45,114 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:20:45,116 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:20:45,120 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:20:45,124 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:20:45,131 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:20:45,133 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:20:45,135 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:20:45,141 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:20:45,149 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:20:45,152 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:20:45,155 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:20:45,157 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:20:45,158 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:20:45,163 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:20:45,164 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:20:45,164 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:20:45,166 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:20:45,167 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:20:45,169 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:20:45,169 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:20:45,171 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:20:45,172 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:20:45,173 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:20:45,175 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:20:45,176 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:20:45,177 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:20:45,177 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:20:45,177 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:20:45,179 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:20:45,180 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:20:45,181 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-23 03:20:45,217 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:20:45,223 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:20:45,224 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:20:45,224 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:20:45,225 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:20:45,225 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:20:45,226 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:20:45,226 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:20:45,226 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:20:45,227 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:20:45,227 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:20:45,227 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:20:45,228 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:20:45,228 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:20:45,228 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:20:45,229 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:20:45,230 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:20:45,230 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:20:45,231 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-23 03:20:45,231 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-23 03:20:45,232 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:20:45,232 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:20:45,232 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-23 03:20:45,234 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:20:45,235 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:20:45,235 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:20:45,236 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-23 03:20:45,236 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-23 03:20:45,237 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-23 03:20:45,237 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:20:45,238 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 03:20:45,238 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:20:45,239 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:20:45,239 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:20:45,239 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:20:45,240 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:20:45,241 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:20:45,242 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:20:45,242 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:20:45,242 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:20:45,242 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:20:45,243 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:20:45,243 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_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 00a8f866e26c2e2f6efeb25e7ec6952d97cdca88cd5ba8f7afdfeeef8678b95c [2021-11-23 03:20:45,578 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:20:45,609 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:20:45,612 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:20:45,614 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:20:45,632 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:20:45,634 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/array-memsafety/array03-alloca-2.i [2021-11-23 03:20:45,713 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/data/70761d2a4/54c2f86cbfbe4a1894d25e6d6780a2e2/FLAG6b950c0f4 [2021-11-23 03:20:46,373 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:20:46,374 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/sv-benchmarks/c/array-memsafety/array03-alloca-2.i [2021-11-23 03:20:46,411 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/data/70761d2a4/54c2f86cbfbe4a1894d25e6d6780a2e2/FLAG6b950c0f4 [2021-11-23 03:20:46,600 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/data/70761d2a4/54c2f86cbfbe4a1894d25e6d6780a2e2 [2021-11-23 03:20:46,604 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:20:46,606 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:20:46,608 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:20:46,609 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:20:46,613 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:20:46,630 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:20:46" (1/1) ... [2021-11-23 03:20:46,631 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12a5eb9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:20:46, skipping insertion in model container [2021-11-23 03:20:46,631 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:20:46" (1/1) ... [2021-11-23 03:20:46,641 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:20:46,700 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:20:47,167 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:20:47,178 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-11-23 03:20:47,179 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@60b42b0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:20:47, skipping insertion in model container [2021-11-23 03:20:47,179 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:20:47,180 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-23 03:20:47,182 INFO L158 Benchmark]: Toolchain (without parser) took 574.98ms. Allocated memory is still 90.2MB. Free memory was 55.6MB in the beginning and 66.6MB in the end (delta: -11.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-23 03:20:47,183 INFO L158 Benchmark]: CDTParser took 0.35ms. Allocated memory is still 90.2MB. Free memory is still 72.9MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 03:20:47,184 INFO L158 Benchmark]: CACSL2BoogieTranslator took 571.35ms. Allocated memory is still 90.2MB. Free memory was 55.5MB in the beginning and 66.6MB in the end (delta: -11.2MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-23 03:20:47,186 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.35ms. Allocated memory is still 90.2MB. Free memory is still 72.9MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 571.35ms. Allocated memory is still 90.2MB. Free memory was 55.5MB in the beginning and 66.6MB in the end (delta: -11.2MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 535]: Unsupported Syntax Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/array03-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 00a8f866e26c2e2f6efeb25e7ec6952d97cdca88cd5ba8f7afdfeeef8678b95c --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:20:50,092 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:20:50,096 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:20:50,137 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:20:50,138 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:20:50,140 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:20:50,142 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:20:50,146 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:20:50,149 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:20:50,150 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:20:50,152 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:20:50,154 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:20:50,155 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:20:50,157 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:20:50,159 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:20:50,161 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:20:50,163 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:20:50,164 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:20:50,167 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:20:50,171 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:20:50,173 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:20:50,175 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:20:50,177 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:20:50,179 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:20:50,184 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:20:50,185 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:20:50,185 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:20:50,187 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:20:50,188 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:20:50,190 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:20:50,190 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:20:50,192 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:20:50,193 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:20:50,194 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:20:50,196 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:20:50,196 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:20:50,198 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:20:50,198 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:20:50,198 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:20:50,200 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:20:50,201 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:20:50,202 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2021-11-23 03:20:50,241 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:20:50,246 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:20:50,247 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:20:50,247 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:20:50,249 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:20:50,249 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:20:50,249 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:20:50,250 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:20:50,251 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:20:50,251 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:20:50,253 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:20:50,253 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:20:50,255 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-23 03:20:50,256 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-23 03:20:50,256 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:20:50,256 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:20:50,257 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-23 03:20:50,257 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:20:50,257 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:20:50,257 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:20:50,258 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-23 03:20:50,258 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-23 03:20:50,258 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-23 03:20:50,259 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:20:50,259 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 03:20:50,259 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 03:20:50,260 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 03:20:50,260 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:20:50,260 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:20:50,261 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:20:50,261 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 03:20:50,261 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:20:50,262 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:20:50,262 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:20:50,263 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:20:50,263 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 03:20:50,263 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 03:20:50,264 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:20:50,264 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:20:50,264 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_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 00a8f866e26c2e2f6efeb25e7ec6952d97cdca88cd5ba8f7afdfeeef8678b95c [2021-11-23 03:20:50,787 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:20:50,813 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:20:50,816 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:20:50,818 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:20:50,819 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:20:50,820 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/array-memsafety/array03-alloca-2.i [2021-11-23 03:20:50,909 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/data/aa2693f23/6477533201734e11843ffe2e17be8b8e/FLAGbb860ee46 [2021-11-23 03:20:51,733 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:20:51,734 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/sv-benchmarks/c/array-memsafety/array03-alloca-2.i [2021-11-23 03:20:51,765 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/data/aa2693f23/6477533201734e11843ffe2e17be8b8e/FLAGbb860ee46 [2021-11-23 03:20:51,956 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/data/aa2693f23/6477533201734e11843ffe2e17be8b8e [2021-11-23 03:20:51,959 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:20:51,961 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:20:51,963 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:20:51,963 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:20:51,968 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:20:51,969 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:20:51" (1/1) ... [2021-11-23 03:20:51,971 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1452b30b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:20:51, skipping insertion in model container [2021-11-23 03:20:51,971 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:20:51" (1/1) ... [2021-11-23 03:20:51,992 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:20:52,053 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:20:52,423 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:20:52,436 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-23 03:20:52,447 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:20:52,481 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:20:52,487 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:20:52,535 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:20:52,596 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:20:52,597 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:20:52 WrapperNode [2021-11-23 03:20:52,597 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:20:52,599 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:20:52,599 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:20:52,599 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:20:52,608 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:20:52" (1/1) ... [2021-11-23 03:20:52,638 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:20:52" (1/1) ... [2021-11-23 03:20:52,679 INFO L137 Inliner]: procedures = 117, calls = 13, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 64 [2021-11-23 03:20:52,680 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:20:52,682 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:20:52,683 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:20:52,683 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:20:52,695 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:20:52" (1/1) ... [2021-11-23 03:20:52,695 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:20:52" (1/1) ... [2021-11-23 03:20:52,717 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:20:52" (1/1) ... [2021-11-23 03:20:52,717 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:20:52" (1/1) ... [2021-11-23 03:20:52,727 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:20:52" (1/1) ... [2021-11-23 03:20:52,744 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:20:52" (1/1) ... [2021-11-23 03:20:52,750 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:20:52" (1/1) ... [2021-11-23 03:20:52,757 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:20:52,763 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:20:52,763 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:20:52,763 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:20:52,764 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:20:52" (1/1) ... [2021-11-23 03:20:52,777 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:20:52,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:20:52,811 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:20:52,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:20:52,873 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-23 03:20:52,873 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 03:20:52,875 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 03:20:52,876 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-23 03:20:52,876 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:20:52,876 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:20:53,040 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:20:53,042 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:20:53,554 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:20:53,562 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:20:53,562 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-23 03:20:53,564 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:20:53 BoogieIcfgContainer [2021-11-23 03:20:53,565 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:20:53,567 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:20:53,567 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:20:53,571 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:20:53,571 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:20:51" (1/3) ... [2021-11-23 03:20:53,572 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29ff6083 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:20:53, skipping insertion in model container [2021-11-23 03:20:53,573 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:20:52" (2/3) ... [2021-11-23 03:20:53,573 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29ff6083 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:20:53, skipping insertion in model container [2021-11-23 03:20:53,573 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:20:53" (3/3) ... [2021-11-23 03:20:53,575 INFO L111 eAbstractionObserver]: Analyzing ICFG array03-alloca-2.i [2021-11-23 03:20:53,582 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:20:53,582 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 17 error locations. [2021-11-23 03:20:53,640 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:20:53,648 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 03:20:53,649 INFO L340 AbstractCegarLoop]: Starting to check reachability of 17 error locations. [2021-11-23 03:20:53,667 INFO L276 IsEmpty]: Start isEmpty. Operand has 45 states, 27 states have (on average 1.962962962962963) internal successors, (53), 44 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:20:53,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 03:20:53,675 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:20:53,676 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 03:20:53,676 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:20:53,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:20:53,683 INFO L85 PathProgramCache]: Analyzing trace with hash 889508873, now seen corresponding path program 1 times [2021-11-23 03:20:53,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:20:53,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1800606285] [2021-11-23 03:20:53,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:20:53,700 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:20:53,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:20:53,706 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:20:53,734 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 03:20:53,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:20:53,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:20:53,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:20:53,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:20:53,926 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:20:53,926 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:20:53,975 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:20:53,976 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:20:53,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1800606285] [2021-11-23 03:20:53,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1800606285] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:20:53,991 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:20:53,991 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-23 03:20:53,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569540401] [2021-11-23 03:20:53,994 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:20:53,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:20:54,000 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:20:54,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:20:54,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:20:54,047 INFO L87 Difference]: Start difference. First operand has 45 states, 27 states have (on average 1.962962962962963) internal successors, (53), 44 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:20:54,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:20:54,237 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-11-23 03:20:54,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:20:54,240 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 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 6 [2021-11-23 03:20:54,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:20:54,263 INFO L225 Difference]: With dead ends: 44 [2021-11-23 03:20:54,263 INFO L226 Difference]: Without dead ends: 42 [2021-11-23 03:20:54,267 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:20:54,275 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 39 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:20:54,277 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 34 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:20:54,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-23 03:20:54,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-11-23 03:20:54,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 41 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:20:54,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2021-11-23 03:20:54,333 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 6 [2021-11-23 03:20:54,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:20:54,335 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2021-11-23 03:20:54,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:20:54,336 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2021-11-23 03:20:54,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 03:20:54,337 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:20:54,337 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 03:20:54,352 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:20:54,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:20:54,553 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:20:54,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:20:54,554 INFO L85 PathProgramCache]: Analyzing trace with hash 889508874, now seen corresponding path program 1 times [2021-11-23 03:20:54,555 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:20:54,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [408293519] [2021-11-23 03:20:54,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:20:54,556 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:20:54,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:20:54,557 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:20:54,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 03:20:54,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:20:54,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 03:20:54,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:20:54,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:20:54,736 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:20:54,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:20:54,986 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:20:54,986 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:20:54,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [408293519] [2021-11-23 03:20:54,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [408293519] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:20:54,987 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:20:54,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-11-23 03:20:54,988 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754460146] [2021-11-23 03:20:54,988 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:20:54,990 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:20:54,990 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:20:54,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:20:54,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:20:54,992 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:20:56,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:20:56,143 INFO L93 Difference]: Finished difference Result 120 states and 133 transitions. [2021-11-23 03:20:56,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:20:56,145 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 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 6 [2021-11-23 03:20:56,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:20:56,148 INFO L225 Difference]: With dead ends: 120 [2021-11-23 03:20:56,148 INFO L226 Difference]: Without dead ends: 120 [2021-11-23 03:20:56,149 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:20:56,151 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 211 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:20:56,152 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 157 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 03:20:56,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-23 03:20:56,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 46. [2021-11-23 03:20:56,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 45 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:20:56,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2021-11-23 03:20:56,167 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 6 [2021-11-23 03:20:56,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:20:56,167 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2021-11-23 03:20:56,168 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:20:56,168 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2021-11-23 03:20:56,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 03:20:56,169 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:20:56,169 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:20:56,188 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:20:56,386 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:20:56,387 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:20:56,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:20:56,388 INFO L85 PathProgramCache]: Analyzing trace with hash 176742579, now seen corresponding path program 1 times [2021-11-23 03:20:56,388 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:20:56,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [316401417] [2021-11-23 03:20:56,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:20:56,389 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:20:56,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:20:56,392 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:20:56,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 03:20:56,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:20:56,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:20:56,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:20:56,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 03:20:56,538 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:20:56,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:20:56,593 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:20:56,594 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:20:56,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [316401417] [2021-11-23 03:20:56,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [316401417] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:20:56,594 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:20:56,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-23 03:20:56,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482541308] [2021-11-23 03:20:56,595 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:20:56,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:20:56,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:20:56,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:20:56,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:20:56,597 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 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) [2021-11-23 03:20:56,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:20:56,854 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2021-11-23 03:20:56,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:20:56,856 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 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 [2021-11-23 03:20:56,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:20:56,857 INFO L225 Difference]: With dead ends: 39 [2021-11-23 03:20:56,857 INFO L226 Difference]: Without dead ends: 39 [2021-11-23 03:20:56,858 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:20:56,859 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 57 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:20:56,860 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 30 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:20:56,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-23 03:20:56,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-11-23 03:20:56,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 30 states have (on average 1.5) internal successors, (45), 38 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:20:56,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2021-11-23 03:20:56,876 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 8 [2021-11-23 03:20:56,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:20:56,877 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2021-11-23 03:20:56,877 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:20:56,878 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2021-11-23 03:20:56,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 03:20:56,878 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:20:56,879 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:20:56,897 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:20:57,092 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:20:57,093 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:20:57,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:20:57,094 INFO L85 PathProgramCache]: Analyzing trace with hash 176742580, now seen corresponding path program 1 times [2021-11-23 03:20:57,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:20:57,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2079390265] [2021-11-23 03:20:57,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:20:57,095 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:20:57,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:20:57,097 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:20:57,101 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 03:20:57,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:20:57,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 03:20:57,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:20:57,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:20:57,286 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:20:57,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:20:57,768 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:20:57,769 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:20:57,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2079390265] [2021-11-23 03:20:57,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2079390265] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:20:57,770 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:20:57,770 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 5] imperfect sequences [] total 8 [2021-11-23 03:20:57,770 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381774992] [2021-11-23 03:20:57,771 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:20:57,771 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:20:57,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:20:57,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:20:57,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:20:57,773 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand has 8 states, 8 states have (on average 1.75) 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) [2021-11-23 03:20:58,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:20:58,450 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2021-11-23 03:20:58,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:20:58,452 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) 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 8 [2021-11-23 03:20:58,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:20:58,453 INFO L225 Difference]: With dead ends: 40 [2021-11-23 03:20:58,453 INFO L226 Difference]: Without dead ends: 40 [2021-11-23 03:20:58,454 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:20:58,456 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 126 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:20:58,456 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 40 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:20:58,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-23 03:20:58,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 33. [2021-11-23 03:20:58,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 30 states have (on average 1.3) internal successors, (39), 32 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) [2021-11-23 03:20:58,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2021-11-23 03:20:58,463 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 8 [2021-11-23 03:20:58,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:20:58,463 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2021-11-23 03:20:58,464 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) 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) [2021-11-23 03:20:58,464 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2021-11-23 03:20:58,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 03:20:58,464 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:20:58,465 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:20:58,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:20:58,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:20:58,666 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:20:58,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:20:58,666 INFO L85 PathProgramCache]: Analyzing trace with hash -1091210163, now seen corresponding path program 1 times [2021-11-23 03:20:58,667 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:20:58,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [282111372] [2021-11-23 03:20:58,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:20:58,668 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:20:58,668 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:20:58,669 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:20:58,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 03:20:58,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:20:58,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:20:58,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:20:58,860 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:20:58,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:20:58,950 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:20:58,950 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:20:58,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [282111372] [2021-11-23 03:20:58,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [282111372] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:20:58,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2895669] [2021-11-23 03:20:58,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:20:58,952 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:20:58,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:20:58,955 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:20:58,977 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-23 03:20:59,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:20:59,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:20:59,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:20:59,139 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:20:59,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:20:59,180 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:20:59,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2895669] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:20:59,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1665504558] [2021-11-23 03:20:59,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:20:59,182 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:20:59,183 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:20:59,185 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:20:59,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:20:59,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:20:59,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:20:59,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:20:59,329 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:20:59,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:20:59,369 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:20:59,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1665504558] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:20:59,370 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:20:59,370 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-23 03:20:59,370 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228200555] [2021-11-23 03:20:59,371 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:20:59,372 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:20:59,372 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:20:59,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:20:59,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:20:59,374 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 8 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) [2021-11-23 03:20:59,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:20:59,471 INFO L93 Difference]: Finished difference Result 61 states and 71 transitions. [2021-11-23 03:20:59,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:20:59,472 INFO L78 Accepts]: Start accepts. Automaton has has 8 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 10 [2021-11-23 03:20:59,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:20:59,474 INFO L225 Difference]: With dead ends: 61 [2021-11-23 03:20:59,476 INFO L226 Difference]: Without dead ends: 61 [2021-11-23 03:20:59,477 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:20:59,481 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 123 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:20:59,485 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 130 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:20:59,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-23 03:20:59,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 39. [2021-11-23 03:20:59,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 36 states have (on average 1.25) internal successors, (45), 38 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:20:59,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2021-11-23 03:20:59,501 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 10 [2021-11-23 03:20:59,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:20:59,502 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2021-11-23 03:20:59,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 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) [2021-11-23 03:20:59,505 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2021-11-23 03:20:59,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 03:20:59,506 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:20:59,506 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:20:59,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 03:20:59,730 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:20:59,923 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:21:00,122 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 03:21:00,122 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:21:00,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:21:00,123 INFO L85 PathProgramCache]: Analyzing trace with hash -1900556789, now seen corresponding path program 1 times [2021-11-23 03:21:00,123 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:21:00,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1212830325] [2021-11-23 03:21:00,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:21:00,124 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:21:00,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:21:00,125 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:21:00,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 03:21:00,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:21:00,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 03:21:00,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:00,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:21:00,510 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:00,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:01,258 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:01,258 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:21:01,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1212830325] [2021-11-23 03:21:01,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1212830325] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:21:01,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1612815446] [2021-11-23 03:21:01,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:21:01,260 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:21:01,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:21:01,262 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:21:01,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-11-23 03:21:01,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:21:01,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:21:01,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:01,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:21:01,681 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:01,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:02,051 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:02,052 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1612815446] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:21:02,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [783262989] [2021-11-23 03:21:02,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:21:02,052 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:21:02,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:21:02,054 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:21:02,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 03:21:02,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:21:02,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:21:02,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:02,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:21:02,303 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:02,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:02,638 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:02,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [783262989] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:21:02,638 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:21:02,638 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 12 [2021-11-23 03:21:02,639 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534633509] [2021-11-23 03:21:02,639 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:21:02,640 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 03:21:02,640 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:21:02,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 03:21:02,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2021-11-23 03:21:02,641 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:21:03,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:21:03,433 INFO L93 Difference]: Finished difference Result 71 states and 83 transitions. [2021-11-23 03:21:03,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:21:03,436 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 13 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 10 [2021-11-23 03:21:03,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:21:03,437 INFO L225 Difference]: With dead ends: 71 [2021-11-23 03:21:03,437 INFO L226 Difference]: Without dead ends: 71 [2021-11-23 03:21:03,438 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:21:03,439 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 108 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 6 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:21:03,440 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 125 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 115 Invalid, 0 Unknown, 6 Unchecked, 0.7s Time] [2021-11-23 03:21:03,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-23 03:21:03,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 47. [2021-11-23 03:21:03,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 44 states have (on average 1.25) internal successors, (55), 46 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:21:03,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2021-11-23 03:21:03,447 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 10 [2021-11-23 03:21:03,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:21:03,458 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2021-11-23 03:21:03,458 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:21:03,458 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2021-11-23 03:21:03,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 03:21:03,459 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:21:03,459 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:21:03,471 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-11-23 03:21:03,685 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 03:21:03,868 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 03:21:04,060 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:21:04,060 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:21:04,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:21:04,061 INFO L85 PathProgramCache]: Analyzing trace with hash 363893485, now seen corresponding path program 1 times [2021-11-23 03:21:04,061 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:21:04,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1102426398] [2021-11-23 03:21:04,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:21:04,061 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:21:04,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:21:04,062 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:21:04,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 03:21:04,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:21:04,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:21:04,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:04,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:21:04,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:04,219 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:21:04,220 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:21:04,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1102426398] [2021-11-23 03:21:04,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1102426398] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:21:04,220 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:21:04,220 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-23 03:21:04,220 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876360468] [2021-11-23 03:21:04,221 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:21:04,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:21:04,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:21:04,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:21:04,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:21:04,222 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:21:04,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:21:04,501 INFO L93 Difference]: Finished difference Result 82 states and 95 transitions. [2021-11-23 03:21:04,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:21:04,503 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-23 03:21:04,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:21:04,504 INFO L225 Difference]: With dead ends: 82 [2021-11-23 03:21:04,504 INFO L226 Difference]: Without dead ends: 82 [2021-11-23 03:21:04,504 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:21:04,505 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 116 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:21:04,506 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 66 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:21:04,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-23 03:21:04,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 47. [2021-11-23 03:21:04,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 46 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:21:04,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2021-11-23 03:21:04,524 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 13 [2021-11-23 03:21:04,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:21:04,524 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2021-11-23 03:21:04,525 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:21:04,525 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2021-11-23 03:21:04,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-23 03:21:04,527 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:21:04,527 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1] [2021-11-23 03:21:04,546 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 03:21:04,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:21:04,741 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:21:04,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:21:04,742 INFO L85 PathProgramCache]: Analyzing trace with hash -1817992175, now seen corresponding path program 2 times [2021-11-23 03:21:04,743 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:21:04,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [522655025] [2021-11-23 03:21:04,743 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:21:04,743 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:21:04,744 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:21:04,745 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:21:04,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 03:21:04,824 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 03:21:04,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:21:04,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 03:21:04,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:04,867 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:21:05,422 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:05,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:06,890 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:06,891 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:21:06,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [522655025] [2021-11-23 03:21:06,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [522655025] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:21:06,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [217442588] [2021-11-23 03:21:06,892 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:21:06,892 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:21:06,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:21:06,895 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:21:06,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-23 03:21:07,026 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 03:21:07,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:21:07,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 03:21:07,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:07,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:21:07,599 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:07,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:08,248 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:08,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [217442588] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:21:08,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338774482] [2021-11-23 03:21:08,249 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:21:08,249 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:21:08,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:21:08,250 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:21:08,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 03:21:08,343 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 03:21:08,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:21:08,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 03:21:08,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:08,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:21:08,835 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:08,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:10,591 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:10,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [338774482] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:21:10,592 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:21:10,592 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 8, 8] total 24 [2021-11-23 03:21:10,593 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562499485] [2021-11-23 03:21:10,593 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:21:10,594 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 03:21:10,594 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:21:10,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 03:21:10,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=425, Unknown=0, NotChecked=0, Total=600 [2021-11-23 03:21:10,596 INFO L87 Difference]: Start difference. First operand 47 states and 54 transitions. Second operand has 25 states, 24 states have (on average 2.7083333333333335) internal successors, (65), 25 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:21:15,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:21:15,011 INFO L93 Difference]: Finished difference Result 173 states and 199 transitions. [2021-11-23 03:21:15,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 03:21:15,014 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.7083333333333335) internal successors, (65), 25 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-23 03:21:15,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:21:15,015 INFO L225 Difference]: With dead ends: 173 [2021-11-23 03:21:15,015 INFO L226 Difference]: Without dead ends: 173 [2021-11-23 03:21:15,016 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 79 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 364 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=313, Invalid=743, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 03:21:15,017 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 759 mSDsluCounter, 399 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 759 SdHoareTripleChecker+Valid, 449 SdHoareTripleChecker+Invalid, 423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 55 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:21:15,018 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [759 Valid, 449 Invalid, 423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 345 Invalid, 0 Unknown, 55 Unchecked, 2.3s Time] [2021-11-23 03:21:15,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-11-23 03:21:15,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 63. [2021-11-23 03:21:15,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 60 states have (on average 1.2333333333333334) internal successors, (74), 62 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:21:15,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2021-11-23 03:21:15,028 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 18 [2021-11-23 03:21:15,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:21:15,028 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2021-11-23 03:21:15,029 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.7083333333333335) internal successors, (65), 25 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:21:15,029 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2021-11-23 03:21:15,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 03:21:15,030 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:21:15,030 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:21:15,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 03:21:15,243 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (14)] Ended with exit code 0 [2021-11-23 03:21:15,469 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 03:21:15,642 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:21:15,642 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:21:15,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:21:15,643 INFO L85 PathProgramCache]: Analyzing trace with hash 1194451038, now seen corresponding path program 1 times [2021-11-23 03:21:15,643 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:21:15,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1238931558] [2021-11-23 03:21:15,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:21:15,643 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:21:15,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:21:15,645 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:21:15,657 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 03:21:15,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:21:15,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 03:21:15,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:15,839 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:21:15,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:15,958 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:21:15,958 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:21:15,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1238931558] [2021-11-23 03:21:15,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1238931558] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:21:15,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1391100680] [2021-11-23 03:21:15,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:21:15,959 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:21:15,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:21:15,962 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:21:15,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-23 03:21:16,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:21:16,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 03:21:16,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:16,211 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:21:16,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:16,284 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:21:16,284 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1391100680] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:21:16,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2110529444] [2021-11-23 03:21:16,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:21:16,285 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:21:16,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:21:16,286 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:21:16,302 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 03:21:16,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:21:16,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 03:21:16,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:16,445 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:21:16,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:16,504 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:21:16,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2110529444] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:21:16,504 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:21:16,504 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-23 03:21:16,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895068830] [2021-11-23 03:21:16,505 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:21:16,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:21:16,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:21:16,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:21:16,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:21:16,506 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:21:16,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:21:16,779 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2021-11-23 03:21:16,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:21:16,783 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-23 03:21:16,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:21:16,784 INFO L225 Difference]: With dead ends: 83 [2021-11-23 03:21:16,784 INFO L226 Difference]: Without dead ends: 83 [2021-11-23 03:21:16,784 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:21:16,785 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 37 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:21:16,785 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 148 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:21:16,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-23 03:21:16,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2021-11-23 03:21:16,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 77 states have (on average 1.2207792207792207) internal successors, (94), 79 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:21:16,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 94 transitions. [2021-11-23 03:21:16,794 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 94 transitions. Word has length 19 [2021-11-23 03:21:16,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:21:16,795 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 94 transitions. [2021-11-23 03:21:16,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:21:16,795 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 94 transitions. [2021-11-23 03:21:16,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 03:21:16,796 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:21:16,797 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:21:16,810 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-23 03:21:17,008 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 03:21:17,227 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 03:21:17,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:21:17,399 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:21:17,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:21:17,400 INFO L85 PathProgramCache]: Analyzing trace with hash -393896864, now seen corresponding path program 1 times [2021-11-23 03:21:17,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:21:17,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1689107495] [2021-11-23 03:21:17,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:21:17,400 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:21:17,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:21:17,401 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:21:17,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 03:21:17,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:21:17,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 03:21:17,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:17,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:21:17,992 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:21:17,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:19,067 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:21:19,067 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:21:19,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1689107495] [2021-11-23 03:21:19,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1689107495] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:21:19,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1797229469] [2021-11-23 03:21:19,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:21:19,068 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:21:19,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:21:19,074 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:21:19,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-11-23 03:21:19,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:21:19,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:21:19,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:19,633 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:19,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:20,024 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:20,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1797229469] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:21:20,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [502567846] [2021-11-23 03:21:20,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:21:20,024 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:21:20,025 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:21:20,042 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:21:20,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 03:21:20,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:21:20,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 03:21:20,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:20,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:21:20,613 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:21:20,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:21,253 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:21:21,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [502567846] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:21:21,253 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:21:21,253 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 8, 7, 6, 6] total 26 [2021-11-23 03:21:21,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133978451] [2021-11-23 03:21:21,254 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:21:21,254 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 03:21:21,254 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:21:21,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 03:21:21,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=551, Unknown=0, NotChecked=0, Total=650 [2021-11-23 03:21:21,256 INFO L87 Difference]: Start difference. First operand 80 states and 94 transitions. Second operand has 26 states, 26 states have (on average 3.230769230769231) internal successors, (84), 26 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:21:23,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:21:23,703 INFO L93 Difference]: Finished difference Result 134 states and 157 transitions. [2021-11-23 03:21:23,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 03:21:23,705 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.230769230769231) internal successors, (84), 26 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-23 03:21:23,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:21:23,707 INFO L225 Difference]: With dead ends: 134 [2021-11-23 03:21:23,707 INFO L226 Difference]: Without dead ends: 134 [2021-11-23 03:21:23,708 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 334 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=305, Invalid=1255, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 03:21:23,709 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 405 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 405 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:21:23,709 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [405 Valid, 252 Invalid, 375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 287 Invalid, 0 Unknown, 47 Unchecked, 1.2s Time] [2021-11-23 03:21:23,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-11-23 03:21:23,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 110. [2021-11-23 03:21:23,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 107 states have (on average 1.233644859813084) internal successors, (132), 109 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:21:23,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 132 transitions. [2021-11-23 03:21:23,720 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 132 transitions. Word has length 19 [2021-11-23 03:21:23,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:21:23,720 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 132 transitions. [2021-11-23 03:21:23,721 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.230769230769231) internal successors, (84), 26 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:21:23,721 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 132 transitions. [2021-11-23 03:21:23,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-23 03:21:23,722 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:21:23,723 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:21:23,742 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (20)] Ended with exit code 0 [2021-11-23 03:21:23,951 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 03:21:24,143 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 03:21:24,325 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:21:24,325 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:21:24,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:21:24,326 INFO L85 PathProgramCache]: Analyzing trace with hash -1626723800, now seen corresponding path program 1 times [2021-11-23 03:21:24,326 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:21:24,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1581984294] [2021-11-23 03:21:24,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:21:24,327 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:21:24,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:21:24,328 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:21:24,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 03:21:24,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:21:24,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:21:24,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:24,572 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:21:24,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:30,769 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:21:30,769 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:21:30,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1581984294] [2021-11-23 03:21:30,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1581984294] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:21:30,770 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:21:30,770 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-23 03:21:30,770 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800831986] [2021-11-23 03:21:30,770 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:21:30,771 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:21:30,771 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:21:30,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:21:30,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=24, Unknown=3, NotChecked=0, Total=42 [2021-11-23 03:21:30,772 INFO L87 Difference]: Start difference. First operand 110 states and 132 transitions. Second operand has 7 states, 6 states have (on average 6.5) internal successors, (39), 7 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) [2021-11-23 03:21:30,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:21:30,896 INFO L93 Difference]: Finished difference Result 109 states and 131 transitions. [2021-11-23 03:21:30,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:21:30,897 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 6.5) internal successors, (39), 7 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 20 [2021-11-23 03:21:30,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:21:30,898 INFO L225 Difference]: With dead ends: 109 [2021-11-23 03:21:30,899 INFO L226 Difference]: Without dead ends: 84 [2021-11-23 03:21:30,899 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=15, Invalid=24, Unknown=3, NotChecked=0, Total=42 [2021-11-23 03:21:30,900 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 28 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 12 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:21:30,900 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 46 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 12 Unchecked, 0.1s Time] [2021-11-23 03:21:30,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-23 03:21:30,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2021-11-23 03:21:30,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 82 states have (on average 1.2073170731707317) internal successors, (99), 83 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) [2021-11-23 03:21:30,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 99 transitions. [2021-11-23 03:21:30,907 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 99 transitions. Word has length 20 [2021-11-23 03:21:30,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:21:30,907 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 99 transitions. [2021-11-23 03:21:30,908 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 6.5) internal successors, (39), 7 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) [2021-11-23 03:21:30,908 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 99 transitions. [2021-11-23 03:21:30,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-23 03:21:30,909 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:21:30,910 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1] [2021-11-23 03:21:30,930 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 03:21:31,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:21:31,123 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:21:31,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:21:31,124 INFO L85 PathProgramCache]: Analyzing trace with hash -563143139, now seen corresponding path program 3 times [2021-11-23 03:21:31,124 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:21:31,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1599595537] [2021-11-23 03:21:31,125 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:21:31,125 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:21:31,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:21:31,126 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:21:31,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 03:21:31,260 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-23 03:21:31,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:21:31,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 03:21:31,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:31,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:21:32,408 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:32,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:35,410 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:35,410 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:21:35,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1599595537] [2021-11-23 03:21:35,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1599595537] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:21:35,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [888205408] [2021-11-23 03:21:35,411 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:21:35,411 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:21:35,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:21:35,412 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:21:35,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-23 03:21:35,720 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-23 03:21:35,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:21:35,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 03:21:35,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:35,863 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:21:37,229 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:37,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:48,514 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:48,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [888205408] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:21:48,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2065003246] [2021-11-23 03:21:48,515 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:21:48,515 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:21:48,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:21:48,516 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:21:48,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 03:21:50,400 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-23 03:21:50,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:21:50,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 03:21:50,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:21:50,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:21:51,510 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:51,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:21:58,678 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:21:58,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2065003246] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:21:58,679 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:21:58,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 13, 15, 14, 14] total 54 [2021-11-23 03:21:58,679 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052608431] [2021-11-23 03:21:58,679 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:21:58,680 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 03:21:58,680 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:21:58,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 03:21:58,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2152, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 03:21:58,683 INFO L87 Difference]: Start difference. First operand 84 states and 99 transitions. Second operand has 55 states, 54 states have (on average 2.9444444444444446) internal successors, (159), 55 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:22:04,654 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.98s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:22:06,657 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:22:08,661 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:22:10,664 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:22:16,866 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:22:18,874 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:22:20,927 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:22:22,599 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.67s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:22:27,140 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.63s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:22:29,205 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:22:31,208 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:22:35,562 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:22:37,249 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:22:41,220 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:22:47,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:47,623 INFO L93 Difference]: Finished difference Result 704 states and 835 transitions. [2021-11-23 03:22:47,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 03:22:47,626 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 2.9444444444444446) internal successors, (159), 55 states have internal predecessors, (159), 0 states have call successors, (0), 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 34 [2021-11-23 03:22:47,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:47,632 INFO L225 Difference]: With dead ends: 704 [2021-11-23 03:22:47,632 INFO L226 Difference]: Without dead ends: 704 [2021-11-23 03:22:47,635 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 147 SyntacticMatches, 5 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2374 ImplicationChecksByTransitivity, 28.3s TimeCoverageRelationStatistics Valid=1458, Invalid=3654, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 03:22:47,636 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 1887 mSDsluCounter, 1001 mSDsCounter, 0 mSdLazyCounter, 1222 mSolverCounterSat, 82 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 33.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1887 SdHoareTripleChecker+Valid, 1078 SdHoareTripleChecker+Invalid, 1339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 1222 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 25 IncrementalHoareTripleChecker+Unchecked, 34.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:47,636 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1887 Valid, 1078 Invalid, 1339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 1222 Invalid, 10 Unknown, 25 Unchecked, 34.3s Time] [2021-11-23 03:22:47,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 704 states. [2021-11-23 03:22:47,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 704 to 116. [2021-11-23 03:22:47,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 114 states have (on average 1.219298245614035) internal successors, (139), 115 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:22:47,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 139 transitions. [2021-11-23 03:22:47,652 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 139 transitions. Word has length 34 [2021-11-23 03:22:47,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:47,653 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 139 transitions. [2021-11-23 03:22:47,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 54 states have (on average 2.9444444444444446) internal successors, (159), 55 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:22:47,653 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 139 transitions. [2021-11-23 03:22:47,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-23 03:22:47,655 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:47,656 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:47,665 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-23 03:22:47,868 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (23)] Ended with exit code 0 [2021-11-23 03:22:48,087 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-11-23 03:22:48,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:48,260 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:22:48,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:48,260 INFO L85 PathProgramCache]: Analyzing trace with hash -265228963, now seen corresponding path program 2 times [2021-11-23 03:22:48,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:22:48,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1263980228] [2021-11-23 03:22:48,261 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:22:48,261 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:22:48,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:22:48,277 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:22:48,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 03:22:48,393 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 03:22:48,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:22:48,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 03:22:48,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:48,432 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 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:22:49,314 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 16 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:22:49,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:22:53,518 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:22:53,518 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:22:53,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1263980228] [2021-11-23 03:22:53,518 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1263980228] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:22:53,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [268086959] [2021-11-23 03:22:53,518 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:22:53,519 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:22:53,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:22:53,519 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:22:53,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-23 03:22:53,688 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 03:22:53,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:22:53,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 03:22:53,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:54,784 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 17 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:22:54,784 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:22:56,244 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 17 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:22:56,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [268086959] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:22:56,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460319526] [2021-11-23 03:22:56,245 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:22:56,246 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:22:56,246 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:56,247 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:22:56,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-23 03:22:56,351 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 03:22:56,351 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:22:56,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 03:22:56,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:22:56,376 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:22:57,604 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 16 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:22:57,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:23:01,463 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:01,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [460319526] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:23:01,463 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:23:01,463 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 11, 10, 11, 11] total 48 [2021-11-23 03:23:01,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179129982] [2021-11-23 03:23:01,464 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:23:01,464 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 03:23:01,465 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:23:01,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 03:23:01,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=2011, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 03:23:01,466 INFO L87 Difference]: Start difference. First operand 116 states and 139 transitions. Second operand has 48 states, 48 states have (on average 3.3541666666666665) internal successors, (161), 48 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:07,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:07,090 INFO L93 Difference]: Finished difference Result 169 states and 201 transitions. [2021-11-23 03:23:07,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 03:23:07,091 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.3541666666666665) internal successors, (161), 48 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-23 03:23:07,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:07,093 INFO L225 Difference]: With dead ends: 169 [2021-11-23 03:23:07,093 INFO L226 Difference]: Without dead ends: 166 [2021-11-23 03:23:07,094 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 173 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1016 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=421, Invalid=3119, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 03:23:07,095 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 165 mSDsluCounter, 407 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 428 SdHoareTripleChecker+Invalid, 398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:07,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [165 Valid, 428 Invalid, 398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 313 Invalid, 0 Unknown, 29 Unchecked, 1.7s Time] [2021-11-23 03:23:07,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-23 03:23:07,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 149. [2021-11-23 03:23:07,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 147 states have (on average 1.2312925170068028) internal successors, (181), 148 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:07,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 181 transitions. [2021-11-23 03:23:07,108 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 181 transitions. Word has length 37 [2021-11-23 03:23:07,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:07,108 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 181 transitions. [2021-11-23 03:23:07,108 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 3.3541666666666665) internal successors, (161), 48 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:07,109 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 181 transitions. [2021-11-23 03:23:07,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-23 03:23:07,111 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:07,111 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:07,135 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-23 03:23:07,327 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (26)] Ended with exit code 0 [2021-11-23 03:23:07,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-11-23 03:23:07,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 03:23:07,718 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:23:07,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:07,719 INFO L85 PathProgramCache]: Analyzing trace with hash 374439734, now seen corresponding path program 1 times [2021-11-23 03:23:07,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:23:07,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1960267841] [2021-11-23 03:23:07,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:07,719 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:23:07,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:23:07,721 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:23:07,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 03:23:07,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:07,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 03:23:07,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:23:07,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:23:08,884 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:08,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:23:13,160 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:13,160 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:23:13,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1960267841] [2021-11-23 03:23:13,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1960267841] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:23:13,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [134563292] [2021-11-23 03:23:13,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:13,161 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:23:13,161 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:23:13,161 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:23:13,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-23 03:23:13,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:13,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 03:23:13,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:23:14,290 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 17 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:23:14,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:23:15,679 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 17 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:23:15,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [134563292] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:23:15,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [586230891] [2021-11-23 03:23:15,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:15,680 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:23:15,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:23:15,681 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:23:15,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-23 03:23:15,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:15,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 03:23:15,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:23:15,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:23:17,055 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 16 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:17,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:23:21,158 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:21,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [586230891] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:23:21,159 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:23:21,159 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 11, 10, 11, 11] total 48 [2021-11-23 03:23:21,159 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755341299] [2021-11-23 03:23:21,160 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:23:21,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 03:23:21,161 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:23:21,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 03:23:21,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=2011, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 03:23:21,163 INFO L87 Difference]: Start difference. First operand 149 states and 181 transitions. Second operand has 48 states, 48 states have (on average 3.7291666666666665) internal successors, (179), 48 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:27,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:27,550 INFO L93 Difference]: Finished difference Result 186 states and 223 transitions. [2021-11-23 03:23:27,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 03:23:27,552 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.7291666666666665) internal successors, (179), 48 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-23 03:23:27,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:27,554 INFO L225 Difference]: With dead ends: 186 [2021-11-23 03:23:27,554 INFO L226 Difference]: Without dead ends: 183 [2021-11-23 03:23:27,556 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 188 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1016 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=421, Invalid=3119, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 03:23:27,557 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 186 mSDsluCounter, 500 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 523 SdHoareTripleChecker+Invalid, 467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:27,557 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 523 Invalid, 467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 386 Invalid, 0 Unknown, 29 Unchecked, 2.4s Time] [2021-11-23 03:23:27,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-11-23 03:23:27,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 153. [2021-11-23 03:23:27,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 151 states have (on average 1.2384105960264902) internal successors, (187), 152 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:27,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 187 transitions. [2021-11-23 03:23:27,564 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 187 transitions. Word has length 39 [2021-11-23 03:23:27,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:27,565 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 187 transitions. [2021-11-23 03:23:27,565 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 3.7291666666666665) internal successors, (179), 48 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:27,566 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 187 transitions. [2021-11-23 03:23:27,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-23 03:23:27,568 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:27,568 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:27,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-23 03:23:27,783 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (30)] Ended with exit code 0 [2021-11-23 03:23:27,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-23 03:23:28,182 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:23:28,182 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:23:28,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:28,183 INFO L85 PathProgramCache]: Analyzing trace with hash -151005020, now seen corresponding path program 2 times [2021-11-23 03:23:28,183 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:23:28,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [488310240] [2021-11-23 03:23:28,183 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:23:28,183 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:23:28,183 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:23:28,184 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:23:28,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 03:23:28,262 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 03:23:28,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:23:28,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 03:23:28,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:23:28,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:23:29,261 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:29,261 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:23:33,804 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:33,804 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:23:33,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [488310240] [2021-11-23 03:23:33,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [488310240] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:23:33,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1501247850] [2021-11-23 03:23:33,805 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:23:33,805 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:23:33,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:23:33,806 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:23:33,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-23 03:23:33,949 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 03:23:33,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:23:33,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 03:23:33,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:23:35,103 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 17 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:23:35,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:23:36,761 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 17 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:23:36,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1501247850] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:23:36,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735647296] [2021-11-23 03:23:36,762 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:23:36,762 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:23:36,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:23:36,763 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:23:36,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-23 03:23:36,835 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 03:23:36,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:23:36,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 03:23:36,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:23:36,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:23:38,300 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 16 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:38,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:23:42,618 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:42,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [735647296] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:23:42,618 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:23:42,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 11, 10, 11, 11] total 48 [2021-11-23 03:23:42,619 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392719171] [2021-11-23 03:23:42,619 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:23:42,619 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 03:23:42,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:23:42,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 03:23:42,622 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=2011, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 03:23:42,622 INFO L87 Difference]: Start difference. First operand 153 states and 187 transitions. Second operand has 48 states, 48 states have (on average 3.8125) internal successors, (183), 48 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:51,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:51,728 INFO L93 Difference]: Finished difference Result 231 states and 280 transitions. [2021-11-23 03:23:51,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 03:23:51,731 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.8125) internal successors, (183), 48 states have internal predecessors, (183), 0 states have call successors, (0), 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 39 [2021-11-23 03:23:51,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:51,733 INFO L225 Difference]: With dead ends: 231 [2021-11-23 03:23:51,733 INFO L226 Difference]: Without dead ends: 225 [2021-11-23 03:23:51,735 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 188 SyntacticMatches, 4 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1153 ImplicationChecksByTransitivity, 15.5s TimeCoverageRelationStatistics Valid=449, Invalid=3583, Unknown=0, NotChecked=0, Total=4032 [2021-11-23 03:23:51,736 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 139 mSDsluCounter, 528 mSDsCounter, 0 mSdLazyCounter, 361 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 549 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 361 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:51,737 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 549 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 361 Invalid, 0 Unknown, 43 Unchecked, 2.2s Time] [2021-11-23 03:23:51,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2021-11-23 03:23:51,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 182. [2021-11-23 03:23:51,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 180 states have (on average 1.25) internal successors, (225), 181 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:51,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 225 transitions. [2021-11-23 03:23:51,745 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 225 transitions. Word has length 39 [2021-11-23 03:23:51,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:51,746 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 225 transitions. [2021-11-23 03:23:51,746 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 3.8125) internal successors, (183), 48 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:51,746 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 225 transitions. [2021-11-23 03:23:51,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 03:23:51,748 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:51,749 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:51,769 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (33)] Ended with exit code 0 [2021-11-23 03:23:51,978 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2021-11-23 03:23:52,161 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 03:23:52,352 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:23:52,352 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:23:52,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:52,353 INFO L85 PathProgramCache]: Analyzing trace with hash -1189252166, now seen corresponding path program 3 times [2021-11-23 03:23:52,353 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:23:52,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2067047526] [2021-11-23 03:23:52,353 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:23:52,353 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:23:52,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:23:52,354 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:23:52,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 03:23:52,464 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 03:23:52,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:23:52,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 03:23:52,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:23:52,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:23:53,294 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 03:23:53,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:23:56,374 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 03:23:56,374 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:23:56,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2067047526] [2021-11-23 03:23:56,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2067047526] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:23:56,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1373902357] [2021-11-23 03:23:56,374 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:23:56,374 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:23:56,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:23:56,375 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:23:56,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-23 03:23:56,667 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 03:23:56,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:23:56,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 03:23:56,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:23:56,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:23:58,156 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 17 treesize of output 13 [2021-11-23 03:23:58,283 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 3 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:58,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:24:05,791 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 3 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:24:05,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1373902357] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:24:05,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1381828171] [2021-11-23 03:24:05,791 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:24:05,792 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:05,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:24:05,793 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:24:05,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-23 03:24:06,078 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 03:24:06,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:24:06,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 03:24:06,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:24:06,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:24:06,706 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 03:24:06,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:24:08,176 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 03:24:08,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1381828171] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:24:08,177 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:24:08,177 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 14, 15, 9, 9] total 42 [2021-11-23 03:24:08,177 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80964266] [2021-11-23 03:24:08,177 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:24:08,178 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-23 03:24:08,178 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:24:08,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-23 03:24:08,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=1488, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 03:24:08,180 INFO L87 Difference]: Start difference. First operand 182 states and 225 transitions. Second operand has 42 states, 42 states have (on average 3.4761904761904763) internal successors, (146), 42 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:25,327 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:28,777 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.70s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:32,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:32,284 INFO L93 Difference]: Finished difference Result 335 states and 404 transitions. [2021-11-23 03:24:32,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-23 03:24:32,286 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.4761904761904763) internal successors, (146), 42 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-23 03:24:32,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:32,288 INFO L225 Difference]: With dead ends: 335 [2021-11-23 03:24:32,288 INFO L226 Difference]: Without dead ends: 212 [2021-11-23 03:24:32,291 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 199 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1371 ImplicationChecksByTransitivity, 23.4s TimeCoverageRelationStatistics Valid=975, Invalid=4281, Unknown=0, NotChecked=0, Total=5256 [2021-11-23 03:24:32,292 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 1855 mSDsluCounter, 1002 mSDsCounter, 0 mSdLazyCounter, 1220 mSolverCounterSat, 137 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1855 SdHoareTripleChecker+Valid, 1064 SdHoareTripleChecker+Invalid, 1466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 137 IncrementalHoareTripleChecker+Valid, 1220 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 108 IncrementalHoareTripleChecker+Unchecked, 8.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:32,292 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1855 Valid, 1064 Invalid, 1466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [137 Valid, 1220 Invalid, 1 Unknown, 108 Unchecked, 8.3s Time] [2021-11-23 03:24:32,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-11-23 03:24:32,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 176. [2021-11-23 03:24:32,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 174 states have (on average 1.2011494252873562) internal successors, (209), 175 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:32,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 209 transitions. [2021-11-23 03:24:32,300 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 209 transitions. Word has length 41 [2021-11-23 03:24:32,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:32,300 INFO L470 AbstractCegarLoop]: Abstraction has 176 states and 209 transitions. [2021-11-23 03:24:32,301 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 3.4761904761904763) internal successors, (146), 42 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:24:32,301 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 209 transitions. [2021-11-23 03:24:32,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 03:24:32,304 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:32,304 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1, 1] [2021-11-23 03:24:32,317 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2021-11-23 03:24:32,516 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (35)] Ended with exit code 0 [2021-11-23 03:24:32,734 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2021-11-23 03:24:32,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:32,908 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:24:32,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:32,908 INFO L85 PathProgramCache]: Analyzing trace with hash 58542645, now seen corresponding path program 4 times [2021-11-23 03:24:32,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:24:32,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2015366527] [2021-11-23 03:24:32,908 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:24:32,909 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:24:32,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:24:32,910 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:24:32,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-23 03:24:33,018 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:24:33,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:24:33,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 03:24:33,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:24:33,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:24:35,301 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:24:35,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:24:46,345 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:24:46,345 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:24:46,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2015366527] [2021-11-23 03:24:46,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2015366527] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:24:46,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [836956212] [2021-11-23 03:24:46,346 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:24:46,346 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:24:46,346 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:24:46,346 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:24:46,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2021-11-23 03:24:46,551 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:24:46,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:24:46,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 03:24:46,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:24:46,567 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:24:47,940 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:24:47,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:24:57,877 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:24:57,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [836956212] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:24:57,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1571588845] [2021-11-23 03:24:57,877 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:24:57,878 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:57,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:24:57,878 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:24:57,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-23 03:24:57,958 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:24:57,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:24:57,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 03:24:57,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:24:57,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:25:00,429 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:25:00,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:25:20,553 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:25:20,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1571588845] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:25:20,553 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:25:20,554 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 19, 19, 26, 26] total 105 [2021-11-23 03:25:20,554 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155590984] [2021-11-23 03:25:20,554 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:25:20,555 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2021-11-23 03:25:20,555 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:25:20,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-11-23 03:25:20,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2920, Invalid=8210, Unknown=0, NotChecked=0, Total=11130 [2021-11-23 03:25:20,559 INFO L87 Difference]: Start difference. First operand 176 states and 209 transitions. Second operand has 106 states, 105 states have (on average 3.104761904761905) internal successors, (326), 106 states have internal predecessors, (326), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:25:33,713 WARN L227 SmtUtils]: Spent 5.67s on a formula simplification that was a NOOP. DAG size: 157 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:25:35,894 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:25:37,943 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:25:39,952 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:25:41,955 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:25:43,958 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:25:45,961 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:25:48,049 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:25:50,052 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:25:55,996 WARN L227 SmtUtils]: Spent 5.31s on a formula simplification that was a NOOP. DAG size: 154 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:26:02,727 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:04,773 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:06,798 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:08,801 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:10,805 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:12,808 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:14,882 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:16,885 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:24,103 WARN L227 SmtUtils]: Spent 6.72s on a formula simplification that was a NOOP. DAG size: 144 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:26:30,850 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:32,853 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:34,857 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:36,914 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:38,917 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:40,920 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:42,923 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:53,925 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:55,928 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:57,931 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:26:59,933 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:01,979 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:04,017 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:06,075 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:16,249 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:18,251 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:20,254 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:22,257 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:24,260 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:26,264 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:36,150 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:37,838 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:39,841 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:41,909 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:43,912 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:45,916 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:54,691 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:56,694 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:27:58,697 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:00,700 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:02,704 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:11,645 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:13,689 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:15,693 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:17,696 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:24,937 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:26,967 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:28,969 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:39,459 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:41,523 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:53,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:28:53,951 INFO L93 Difference]: Finished difference Result 3074 states and 3669 transitions. [2021-11-23 03:28:53,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-23 03:28:53,953 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 105 states have (on average 3.104761904761905) internal successors, (326), 106 states have internal predecessors, (326), 0 states have call successors, (0), 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 66 [2021-11-23 03:28:53,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:28:53,975 INFO L225 Difference]: With dead ends: 3074 [2021-11-23 03:28:53,975 INFO L226 Difference]: Without dead ends: 3074 [2021-11-23 03:28:53,981 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 298 SyntacticMatches, 1 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8384 ImplicationChecksByTransitivity, 115.6s TimeCoverageRelationStatistics Valid=5451, Invalid=14289, Unknown=0, NotChecked=0, Total=19740 [2021-11-23 03:28:53,983 INFO L933 BasicCegarLoop]: 151 mSDtfsCounter, 8018 mSDsluCounter, 4482 mSDsCounter, 0 mSdLazyCounter, 5109 mSolverCounterSat, 235 mSolverCounterUnsat, 55 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 129.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8018 SdHoareTripleChecker+Valid, 4633 SdHoareTripleChecker+Invalid, 5588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 235 IncrementalHoareTripleChecker+Valid, 5109 IncrementalHoareTripleChecker+Invalid, 55 IncrementalHoareTripleChecker+Unknown, 189 IncrementalHoareTripleChecker+Unchecked, 131.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:28:53,983 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8018 Valid, 4633 Invalid, 5588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [235 Valid, 5109 Invalid, 55 Unknown, 189 Unchecked, 131.5s Time] [2021-11-23 03:28:53,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3074 states. [2021-11-23 03:28:54,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3074 to 240. [2021-11-23 03:28:54,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 240 states, 238 states have (on average 1.2142857142857142) internal successors, (289), 239 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:28:54,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 289 transitions. [2021-11-23 03:28:54,012 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 289 transitions. Word has length 66 [2021-11-23 03:28:54,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:28:54,013 INFO L470 AbstractCegarLoop]: Abstraction has 240 states and 289 transitions. [2021-11-23 03:28:54,014 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 105 states have (on average 3.104761904761905) internal successors, (326), 106 states have internal predecessors, (326), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:28:54,014 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 289 transitions. [2021-11-23 03:28:54,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-23 03:28:54,015 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:28:54,016 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:28:54,021 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (39)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:54,226 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:54,441 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:54,618 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:28:54,619 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:28:54,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:28:54,619 INFO L85 PathProgramCache]: Analyzing trace with hash -1784706217, now seen corresponding path program 4 times [2021-11-23 03:28:54,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:28:54,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1206926233] [2021-11-23 03:28:54,620 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:28:54,620 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:28:54,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:28:54,621 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:28:54,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-23 03:28:54,783 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:28:54,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:28:54,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 03:28:54,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:54,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:28:56,401 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 58 proven. 128 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:28:56,401 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:04,901 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:04,901 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:29:04,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1206926233] [2021-11-23 03:29:04,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1206926233] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:04,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1339229044] [2021-11-23 03:29:04,901 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:29:04,901 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:04,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:29:04,902 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:29:04,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-11-23 03:29:05,073 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:29:05,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:29:05,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 03:29:05,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:07,076 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 91 proven. 74 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 03:29:07,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:10,123 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 91 proven. 74 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 03:29:10,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1339229044] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:10,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893943085] [2021-11-23 03:29:10,124 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:29:10,124 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:29:10,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:29:10,125 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:29:10,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-23 03:29:10,216 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:29:10,216 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:29:10,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 03:29:10,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:10,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:29:10,376 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 17 treesize of output 13 [2021-11-23 03:29:11,431 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 77 proven. 103 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 03:29:11,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:14,787 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 77 proven. 103 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 03:29:14,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1893943085] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:14,787 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:29:14,787 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18, 15, 14, 17, 16] total 69 [2021-11-23 03:29:14,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288820535] [2021-11-23 03:29:14,788 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:29:14,788 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-23 03:29:14,788 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:29:14,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-23 03:29:14,789 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=4255, Unknown=0, NotChecked=0, Total=4692 [2021-11-23 03:29:14,789 INFO L87 Difference]: Start difference. First operand 240 states and 289 transitions. Second operand has 69 states, 69 states have (on average 4.0144927536231885) internal successors, (277), 69 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:25,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:25,961 INFO L93 Difference]: Finished difference Result 325 states and 390 transitions. [2021-11-23 03:29:25,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 03:29:25,962 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 4.0144927536231885) internal successors, (277), 69 states have internal predecessors, (277), 0 states have call successors, (0), 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 73 [2021-11-23 03:29:25,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:25,964 INFO L225 Difference]: With dead ends: 325 [2021-11-23 03:29:25,964 INFO L226 Difference]: Without dead ends: 319 [2021-11-23 03:29:25,965 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 370 SyntacticMatches, 5 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2179 ImplicationChecksByTransitivity, 23.1s TimeCoverageRelationStatistics Valid=861, Invalid=7881, Unknown=0, NotChecked=0, Total=8742 [2021-11-23 03:29:25,965 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 197 mSDsluCounter, 1079 mSDsCounter, 0 mSdLazyCounter, 519 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 1111 SdHoareTripleChecker+Invalid, 649 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 519 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 79 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:25,965 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [197 Valid, 1111 Invalid, 649 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 519 Invalid, 0 Unknown, 79 Unchecked, 1.4s Time] [2021-11-23 03:29:25,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2021-11-23 03:29:25,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 301. [2021-11-23 03:29:25,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 299 states have (on average 1.2240802675585285) internal successors, (366), 300 states have internal predecessors, (366), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:25,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 366 transitions. [2021-11-23 03:29:25,973 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 366 transitions. Word has length 73 [2021-11-23 03:29:25,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:25,973 INFO L470 AbstractCegarLoop]: Abstraction has 301 states and 366 transitions. [2021-11-23 03:29:25,973 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 4.0144927536231885) internal successors, (277), 69 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:25,974 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 366 transitions. [2021-11-23 03:29:25,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 03:29:25,975 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:25,975 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:25,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (42)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:26,199 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2021-11-23 03:29:26,388 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:26,578 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:29:26,578 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:29:26,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:26,578 INFO L85 PathProgramCache]: Analyzing trace with hash -2043957520, now seen corresponding path program 3 times [2021-11-23 03:29:26,578 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:29:26,579 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1202073028] [2021-11-23 03:29:26,579 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:29:26,579 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:29:26,579 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:29:26,579 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:29:26,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-23 03:29:26,804 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-23 03:29:26,804 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:29:26,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 03:29:26,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:26,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:29:30,095 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 101 proven. 69 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 03:29:30,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:29,625 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 170 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 03:30:29,625 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:30:29,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1202073028] [2021-11-23 03:30:29,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1202073028] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:29,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [929926427] [2021-11-23 03:30:29,626 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:30:29,626 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:30:29,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:30:29,627 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:30:29,628 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (45)] Waiting until timeout for monitored process [2021-11-23 03:30:31,303 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-23 03:30:31,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:30:31,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 03:30:31,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:31,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:30:38,896 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 132 proven. 38 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 03:30:38,897 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:32:02,305 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 52 proven. 118 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 03:32:02,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [929926427] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:32:02,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [837450419] [2021-11-23 03:32:02,306 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:32:02,306 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:32:02,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:32:02,323 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:32:02,342 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-23 03:32:02,777 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-23 03:32:02,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:32:02,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 03:32:02,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:32:02,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:32:08,632 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 140 proven. 30 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 03:32:08,632 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:33:03,513 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 72 proven. 98 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 03:33:03,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [837450419] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:33:03,514 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:33:03,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 19, 19, 20, 19] total 77 [2021-11-23 03:33:03,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744409969] [2021-11-23 03:33:03,514 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:33:03,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-23 03:33:03,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:33:03,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-23 03:33:03,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=669, Invalid=5153, Unknown=30, NotChecked=0, Total=5852 [2021-11-23 03:33:03,516 INFO L87 Difference]: Start difference. First operand 301 states and 366 transitions. Second operand has 77 states, 77 states have (on average 3.6363636363636362) internal successors, (280), 77 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:33:11,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:33:11,350 INFO L93 Difference]: Finished difference Result 437 states and 528 transitions. [2021-11-23 03:33:11,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 03:33:11,351 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 3.6363636363636362) internal successors, (280), 77 states have internal predecessors, (280), 0 states have call successors, (0), 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 75 [2021-11-23 03:33:11,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:33:11,353 INFO L225 Difference]: With dead ends: 437 [2021-11-23 03:33:11,353 INFO L226 Difference]: Without dead ends: 425 [2021-11-23 03:33:11,354 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 363 SyntacticMatches, 8 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3244 ImplicationChecksByTransitivity, 147.9s TimeCoverageRelationStatistics Valid=765, Invalid=5685, Unknown=30, NotChecked=0, Total=6480 [2021-11-23 03:33:11,354 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 137 mSDsluCounter, 919 mSDsCounter, 0 mSdLazyCounter, 308 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 957 SdHoareTripleChecker+Invalid, 666 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 308 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 355 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:33:11,355 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 957 Invalid, 666 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 308 Invalid, 0 Unknown, 355 Unchecked, 3.8s Time] [2021-11-23 03:33:11,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 425 states. [2021-11-23 03:33:11,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 425 to 382. [2021-11-23 03:33:11,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 380 states have (on average 1.2421052631578948) internal successors, (472), 381 states have internal predecessors, (472), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:33:11,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 472 transitions. [2021-11-23 03:33:11,363 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 472 transitions. Word has length 75 [2021-11-23 03:33:11,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:33:11,364 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 472 transitions. [2021-11-23 03:33:11,364 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 3.6363636363636362) internal successors, (280), 77 states have internal predecessors, (280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:33:11,364 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 472 transitions. [2021-11-23 03:33:11,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 03:33:11,365 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:33:11,366 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:33:11,391 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2021-11-23 03:33:11,581 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (44)] Ended with exit code 0 [2021-11-23 03:33:11,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (45)] Forceful destruction successful, exit code 0 [2021-11-23 03:33:11,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 03:33:11,974 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:33:11,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:33:11,974 INFO L85 PathProgramCache]: Analyzing trace with hash 2087612318, now seen corresponding path program 4 times [2021-11-23 03:33:11,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:33:11,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [310287107] [2021-11-23 03:33:11,975 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:33:11,975 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:33:11,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:33:11,976 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:33:11,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-23 03:33:12,082 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:33:12,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:33:12,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 03:33:12,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:33:12,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:33:14,951 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 66 proven. 118 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 03:33:14,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:33:26,782 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:33:26,783 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:33:26,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [310287107] [2021-11-23 03:33:26,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [310287107] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:33:26,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1388452957] [2021-11-23 03:33:26,783 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:33:26,783 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:33:26,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:33:26,784 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:33:26,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2021-11-23 03:33:27,026 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:33:27,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:33:27,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 03:33:27,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:33:30,794 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 91 proven. 74 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 03:33:30,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:33:35,471 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 91 proven. 74 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 03:33:35,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1388452957] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:33:35,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1559597184] [2021-11-23 03:33:35,471 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:33:35,471 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:33:35,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:33:35,472 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:33:35,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-23 03:33:35,561 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:33:35,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:33:35,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 03:33:35,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:33:35,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:33:35,891 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 17 treesize of output 13 [2021-11-23 03:33:37,869 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 77 proven. 103 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 03:33:37,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:33:42,947 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 77 proven. 103 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 03:33:42,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1559597184] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:33:42,947 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:33:42,947 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18, 15, 14, 17, 16] total 69 [2021-11-23 03:33:42,947 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741344660] [2021-11-23 03:33:42,948 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:33:42,948 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-23 03:33:42,948 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:33:42,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-23 03:33:42,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=4255, Unknown=0, NotChecked=0, Total=4692 [2021-11-23 03:33:42,950 INFO L87 Difference]: Start difference. First operand 382 states and 472 transitions. Second operand has 69 states, 69 states have (on average 4.144927536231884) internal successors, (286), 69 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:34:04,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:34:04,461 INFO L93 Difference]: Finished difference Result 796 states and 975 transitions. [2021-11-23 03:34:04,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-23 03:34:04,463 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 4.144927536231884) internal successors, (286), 69 states have internal predecessors, (286), 0 states have call successors, (0), 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 75 [2021-11-23 03:34:04,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:34:04,466 INFO L225 Difference]: With dead ends: 796 [2021-11-23 03:34:04,466 INFO L226 Difference]: Without dead ends: 772 [2021-11-23 03:34:04,468 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 385 SyntacticMatches, 5 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2519 ImplicationChecksByTransitivity, 38.9s TimeCoverageRelationStatistics Valid=955, Invalid=9347, Unknown=0, NotChecked=0, Total=10302 [2021-11-23 03:34:04,468 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 248 mSDsluCounter, 1052 mSDsCounter, 0 mSdLazyCounter, 544 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 1084 SdHoareTripleChecker+Invalid, 707 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 544 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 90 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:34:04,469 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [248 Valid, 1084 Invalid, 707 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 544 Invalid, 0 Unknown, 90 Unchecked, 2.6s Time] [2021-11-23 03:34:04,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 772 states. [2021-11-23 03:34:04,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 772 to 506. [2021-11-23 03:34:04,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 506 states, 504 states have (on average 1.2599206349206349) internal successors, (635), 505 states have internal predecessors, (635), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:34:04,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 506 states to 506 states and 635 transitions. [2021-11-23 03:34:04,482 INFO L78 Accepts]: Start accepts. Automaton has 506 states and 635 transitions. Word has length 75 [2021-11-23 03:34:04,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:34:04,482 INFO L470 AbstractCegarLoop]: Abstraction has 506 states and 635 transitions. [2021-11-23 03:34:04,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 4.144927536231884) internal successors, (286), 69 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:34:04,483 INFO L276 IsEmpty]: Start isEmpty. Operand 506 states and 635 transitions. [2021-11-23 03:34:04,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-23 03:34:04,484 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:34:04,484 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 5, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:34:04,493 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (48)] Forceful destruction successful, exit code 0 [2021-11-23 03:34:04,708 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-23 03:34:04,895 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (47)] Ended with exit code 0 [2021-11-23 03:34:05,087 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:34:05,087 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 13 more)] === [2021-11-23 03:34:05,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:34:05,087 INFO L85 PathProgramCache]: Analyzing trace with hash 413280265, now seen corresponding path program 5 times [2021-11-23 03:34:05,088 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:34:05,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1544888289] [2021-11-23 03:34:05,088 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 03:34:05,088 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:34:05,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:34:05,090 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:34:05,124 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-23 03:34:05,322 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-11-23 03:34:05,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:34:05,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 03:34:05,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:34:05,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 03:34:08,281 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 76 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 03:34:08,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:34:18,231 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 0 proven. 191 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:34:18,231 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:34:18,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1544888289] [2021-11-23 03:34:18,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1544888289] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:34:18,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1655351346] [2021-11-23 03:34:18,231 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 03:34:18,232 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:34:18,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:34:18,232 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:34:18,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_187357ea-d655-4462-b63d-adf6d2eac9bd/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process