./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/insertionsort-alloca-1.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_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/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_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/insertionsort-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/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_b428bf27-b0e3-4021-8645-1da4c8ea3c72/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 56160afe0156ee9cb1db810e306de9e54e614e31d545b68546457414a273604d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:06:40,728 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:06:40,730 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:06:40,764 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:06:40,765 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:06:40,766 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:06:40,768 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:06:40,771 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:06:40,773 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:06:40,774 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:06:40,776 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:06:40,777 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:06:40,778 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:06:40,780 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:06:40,781 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:06:40,783 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:06:40,785 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:06:40,786 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:06:40,794 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:06:40,797 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:06:40,800 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:06:40,811 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:06:40,813 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:06:40,814 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:06:40,819 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:06:40,819 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:06:40,820 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:06:40,821 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:06:40,822 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:06:40,823 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:06:40,824 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:06:40,832 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:06:40,835 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:06:40,837 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:06:40,838 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:06:40,839 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:06:40,840 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:06:40,840 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:06:40,840 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:06:40,841 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:06:40,842 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:06:40,843 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-23 02:06:40,911 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:06:40,916 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:06:40,917 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:06:40,918 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:06:40,918 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:06:40,919 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:06:40,920 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:06:40,920 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:06:40,920 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:06:40,921 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:06:40,922 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:06:40,922 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:06:40,923 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:06:40,923 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:06:40,923 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:06:40,923 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:06:40,924 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:06:40,924 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:06:40,925 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-23 02:06:40,925 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-23 02:06:40,925 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:06:40,926 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:06:40,926 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-23 02:06:40,928 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:06:40,928 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:06:40,928 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:06:40,928 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-23 02:06:40,929 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-23 02:06:40,929 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-23 02:06:40,929 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:06:40,930 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 02:06:40,930 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:06:40,930 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:06:40,930 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:06:40,931 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:06:40,931 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:06:40,931 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:06:40,932 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:06:40,932 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:06:40,932 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:06:40,932 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:06:40,933 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:06:40,933 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_b428bf27-b0e3-4021-8645-1da4c8ea3c72/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 56160afe0156ee9cb1db810e306de9e54e614e31d545b68546457414a273604d [2021-11-23 02:06:41,218 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:06:41,254 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:06:41,257 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:06:41,258 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:06:41,259 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:06:41,261 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/array-memsafety/insertionsort-alloca-1.i [2021-11-23 02:06:41,356 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/data/4ac7fe426/d4b93157c5de48d1817146e472d84cf4/FLAG507e0257a [2021-11-23 02:06:42,046 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:06:42,047 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/sv-benchmarks/c/array-memsafety/insertionsort-alloca-1.i [2021-11-23 02:06:42,066 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/data/4ac7fe426/d4b93157c5de48d1817146e472d84cf4/FLAG507e0257a [2021-11-23 02:06:42,344 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/data/4ac7fe426/d4b93157c5de48d1817146e472d84cf4 [2021-11-23 02:06:42,346 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:06:42,348 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:06:42,350 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:06:42,350 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:06:42,361 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:06:42,362 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:06:42" (1/1) ... [2021-11-23 02:06:42,365 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e669e62 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:06:42, skipping insertion in model container [2021-11-23 02:06:42,366 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:06:42" (1/1) ... [2021-11-23 02:06:42,375 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:06:42,436 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:06:42,800 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:06:42,810 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 02:06:42,811 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@5ff8593c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:06:42, skipping insertion in model container [2021-11-23 02:06:42,812 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:06:42,812 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-23 02:06:42,815 INFO L158 Benchmark]: Toolchain (without parser) took 465.61ms. Allocated memory was 100.7MB in the beginning and 140.5MB in the end (delta: 39.8MB). Free memory was 65.9MB in the beginning and 114.1MB in the end (delta: -48.2MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-23 02:06:42,816 INFO L158 Benchmark]: CDTParser took 0.32ms. Allocated memory is still 100.7MB. Free memory is still 54.0MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 02:06:42,818 INFO L158 Benchmark]: CACSL2BoogieTranslator took 462.45ms. Allocated memory was 100.7MB in the beginning and 140.5MB in the end (delta: 39.8MB). Free memory was 65.7MB in the beginning and 114.1MB in the end (delta: -48.4MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-23 02:06:42,821 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32ms. Allocated memory is still 100.7MB. Free memory is still 54.0MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 462.45ms. Allocated memory was 100.7MB in the beginning and 140.5MB in the end (delta: 39.8MB). Free memory was 65.7MB in the beginning and 114.1MB in the end (delta: -48.4MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 528]: 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_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/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_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/insertionsort-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/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_b428bf27-b0e3-4021-8645-1da4c8ea3c72/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 56160afe0156ee9cb1db810e306de9e54e614e31d545b68546457414a273604d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:06:45,349 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:06:45,352 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:06:45,405 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:06:45,406 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:06:45,411 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:06:45,414 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:06:45,419 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:06:45,423 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:06:45,433 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:06:45,434 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:06:45,437 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:06:45,437 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:06:45,441 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:06:45,443 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:06:45,448 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:06:45,450 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:06:45,452 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:06:45,454 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:06:45,463 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:06:45,466 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:06:45,468 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:06:45,471 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:06:45,474 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:06:45,487 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:06:45,488 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:06:45,489 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:06:45,491 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:06:45,492 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:06:45,493 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:06:45,495 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:06:45,496 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:06:45,498 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:06:45,500 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:06:45,502 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:06:45,502 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:06:45,503 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:06:45,504 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:06:45,504 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:06:45,507 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:06:45,508 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:06:45,515 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2021-11-23 02:06:45,575 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:06:45,576 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:06:45,577 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:06:45,577 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:06:45,578 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:06:45,578 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:06:45,578 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:06:45,579 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:06:45,580 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:06:45,580 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:06:45,581 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:06:45,582 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:06:45,583 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-23 02:06:45,584 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-23 02:06:45,584 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:06:45,585 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:06:45,585 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-23 02:06:45,585 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:06:45,585 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:06:45,586 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:06:45,586 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-23 02:06:45,586 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-23 02:06:45,586 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-23 02:06:45,587 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:06:45,587 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 02:06:45,587 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 02:06:45,587 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 02:06:45,588 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:06:45,588 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:06:45,588 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:06:45,589 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 02:06:45,589 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:06:45,590 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:06:45,590 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:06:45,590 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:06:45,591 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 02:06:45,591 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 02:06:45,591 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:06:45,591 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:06:45,592 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_b428bf27-b0e3-4021-8645-1da4c8ea3c72/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 56160afe0156ee9cb1db810e306de9e54e614e31d545b68546457414a273604d [2021-11-23 02:06:46,073 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:06:46,099 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:06:46,102 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:06:46,103 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:06:46,104 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:06:46,106 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/array-memsafety/insertionsort-alloca-1.i [2021-11-23 02:06:46,180 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/data/f0701cf91/ff817776f14c4dcf9657e4f3df5aa1c3/FLAG6f2d77810 [2021-11-23 02:06:46,779 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:06:46,784 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/sv-benchmarks/c/array-memsafety/insertionsort-alloca-1.i [2021-11-23 02:06:46,803 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/data/f0701cf91/ff817776f14c4dcf9657e4f3df5aa1c3/FLAG6f2d77810 [2021-11-23 02:06:47,061 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/data/f0701cf91/ff817776f14c4dcf9657e4f3df5aa1c3 [2021-11-23 02:06:47,064 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:06:47,065 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:06:47,067 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:06:47,067 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:06:47,075 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:06:47,077 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:06:47" (1/1) ... [2021-11-23 02:06:47,078 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2202e4e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:06:47, skipping insertion in model container [2021-11-23 02:06:47,078 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:06:47" (1/1) ... [2021-11-23 02:06:47,089 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:06:47,155 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:06:47,570 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:06:47,583 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-23 02:06:47,591 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:06:47,627 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:06:47,634 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:06:47,710 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:06:47,764 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:06:47,765 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:06:47 WrapperNode [2021-11-23 02:06:47,766 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:06:47,767 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:06:47,768 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:06:47,768 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:06:47,777 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:06:47" (1/1) ... [2021-11-23 02:06:47,815 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:06:47" (1/1) ... [2021-11-23 02:06:47,854 INFO L137 Inliner]: procedures = 117, calls = 12, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 65 [2021-11-23 02:06:47,854 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:06:47,855 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:06:47,855 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:06:47,855 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:06:47,864 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:06:47" (1/1) ... [2021-11-23 02:06:47,864 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:06:47" (1/1) ... [2021-11-23 02:06:47,868 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:06:47" (1/1) ... [2021-11-23 02:06:47,868 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:06:47" (1/1) ... [2021-11-23 02:06:47,877 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:06:47" (1/1) ... [2021-11-23 02:06:47,881 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:06:47" (1/1) ... [2021-11-23 02:06:47,883 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:06:47" (1/1) ... [2021-11-23 02:06:47,887 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:06:47,888 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:06:47,888 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:06:47,889 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:06:47,890 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:06:47" (1/1) ... [2021-11-23 02:06:47,920 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:06:47,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:06:47,952 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:06:47,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:06:48,013 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-23 02:06:48,014 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 02:06:48,016 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 02:06:48,017 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-23 02:06:48,017 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:06:48,017 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:06:48,162 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:06:48,163 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:06:48,513 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:06:48,520 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:06:48,521 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-23 02:06:48,523 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:06:48 BoogieIcfgContainer [2021-11-23 02:06:48,523 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:06:48,526 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:06:48,526 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:06:48,529 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:06:48,530 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:06:47" (1/3) ... [2021-11-23 02:06:48,531 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17bd26f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:06:48, skipping insertion in model container [2021-11-23 02:06:48,531 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:06:47" (2/3) ... [2021-11-23 02:06:48,531 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17bd26f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:06:48, skipping insertion in model container [2021-11-23 02:06:48,532 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:06:48" (3/3) ... [2021-11-23 02:06:48,533 INFO L111 eAbstractionObserver]: Analyzing ICFG insertionsort-alloca-1.i [2021-11-23 02:06:48,540 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:06:48,540 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 13 error locations. [2021-11-23 02:06:48,594 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:06:48,602 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 02:06:48,602 INFO L340 AbstractCegarLoop]: Starting to check reachability of 13 error locations. [2021-11-23 02:06:48,620 INFO L276 IsEmpty]: Start isEmpty. Operand has 40 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 39 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 02:06:48,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 02:06:48,628 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:48,629 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 02:06:48,629 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:06:48,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:48,636 INFO L85 PathProgramCache]: Analyzing trace with hash 889508873, now seen corresponding path program 1 times [2021-11-23 02:06:48,650 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:06:48,650 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [543789805] [2021-11-23 02:06:48,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:48,652 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:06:48,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:06:48,656 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:06:48,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 02:06:48,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:48,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:06:48,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:48,863 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 6 treesize of output 5 [2021-11-23 02:06:48,894 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 02:06:48,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:06:48,931 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 02:06:48,933 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:06:48,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [543789805] [2021-11-23 02:06:48,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [543789805] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:48,936 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:48,936 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-23 02:06:48,938 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75527015] [2021-11-23 02:06:48,939 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:48,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:06:48,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:06:48,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:06:48,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:06:49,000 INFO L87 Difference]: Start difference. First operand has 40 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 39 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) 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 02:06:49,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:49,174 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2021-11-23 02:06:49,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:06:49,177 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 02:06:49,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:49,187 INFO L225 Difference]: With dead ends: 39 [2021-11-23 02:06:49,187 INFO L226 Difference]: Without dead ends: 37 [2021-11-23 02:06:49,189 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 02:06:49,194 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 33 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:49,195 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 32 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:06:49,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-23 02:06:49,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-23 02:06:49,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 25 states have (on average 1.64) internal successors, (41), 36 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:49,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-11-23 02:06:49,233 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 6 [2021-11-23 02:06:49,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:49,233 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-11-23 02:06:49,234 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 02:06:49,234 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-11-23 02:06:49,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 02:06:49,235 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:49,235 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 02:06:49,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:06:49,447 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:06:49,447 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:06:49,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:49,448 INFO L85 PathProgramCache]: Analyzing trace with hash 889508874, now seen corresponding path program 1 times [2021-11-23 02:06:49,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:06:49,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1814971016] [2021-11-23 02:06:49,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:49,450 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:06:49,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:06:49,457 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:06:49,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 02:06:49,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:49,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:06:49,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:49,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 02:06:49,641 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 02:06:49,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:06:49,843 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 02:06:49,843 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:06:49,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1814971016] [2021-11-23 02:06:49,844 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1814971016] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:49,844 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:49,844 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-11-23 02:06:49,844 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682959295] [2021-11-23 02:06:49,845 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:49,846 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:06:49,846 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:06:49,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:06:49,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:06:49,847 INFO L87 Difference]: Start difference. First operand 37 states and 41 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 02:06:50,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:50,547 INFO L93 Difference]: Finished difference Result 105 states and 115 transitions. [2021-11-23 02:06:50,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:06:50,548 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 02:06:50,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:50,550 INFO L225 Difference]: With dead ends: 105 [2021-11-23 02:06:50,551 INFO L226 Difference]: Without dead ends: 105 [2021-11-23 02:06:50,551 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:06:50,553 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 183 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:50,554 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [183 Valid, 119 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:06:50,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-23 02:06:50,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 41. [2021-11-23 02:06:50,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 40 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:50,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2021-11-23 02:06:50,563 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 6 [2021-11-23 02:06:50,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:50,563 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2021-11-23 02:06:50,563 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 02:06:50,563 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2021-11-23 02:06:50,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 02:06:50,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:50,564 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:50,572 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-11-23 02:06:50,768 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:06:50,769 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:06:50,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:50,769 INFO L85 PathProgramCache]: Analyzing trace with hash 176742579, now seen corresponding path program 1 times [2021-11-23 02:06:50,770 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:06:50,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [200123208] [2021-11-23 02:06:50,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:50,770 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:06:50,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:06:50,771 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:06:50,772 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 02:06:50,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:50,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:06:50,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:50,833 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 6 treesize of output 5 [2021-11-23 02:06:50,876 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 02:06:50,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:06:50,930 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 02:06:50,943 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:06:50,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [200123208] [2021-11-23 02:06:50,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [200123208] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:50,944 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:50,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-23 02:06:50,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625025768] [2021-11-23 02:06:50,944 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:50,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:06:50,945 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:06:50,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:06:50,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:06:50,946 INFO L87 Difference]: Start difference. First operand 41 states and 46 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 02:06:51,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:51,114 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-11-23 02:06:51,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:06:51,118 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 02:06:51,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:51,119 INFO L225 Difference]: With dead ends: 36 [2021-11-23 02:06:51,119 INFO L226 Difference]: Without dead ends: 36 [2021-11-23 02:06:51,119 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:06:51,121 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 49 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:51,121 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 30 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:06:51,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-23 02:06:51,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-23 02:06:51,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 35 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:51,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2021-11-23 02:06:51,132 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 8 [2021-11-23 02:06:51,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:51,132 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2021-11-23 02:06:51,134 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 02:06:51,135 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2021-11-23 02:06:51,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 02:06:51,136 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:51,136 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:51,152 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:06:51,349 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:06:51,349 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:06:51,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:51,350 INFO L85 PathProgramCache]: Analyzing trace with hash 176742580, now seen corresponding path program 1 times [2021-11-23 02:06:51,350 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:06:51,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [443385128] [2021-11-23 02:06:51,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:51,351 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:06:51,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:06:51,352 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:06:51,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 02:06:51,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:51,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:06:51,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:51,444 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 02:06:51,519 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 02:06:51,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:06:51,976 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 02:06:51,976 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:06:51,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [443385128] [2021-11-23 02:06:51,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [443385128] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:51,977 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:51,977 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 5] imperfect sequences [] total 8 [2021-11-23 02:06:51,978 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379298013] [2021-11-23 02:06:51,978 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:51,978 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:06:51,978 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:06:51,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:06:51,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:06:51,980 INFO L87 Difference]: Start difference. First operand 36 states and 41 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 02:06:52,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:52,678 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2021-11-23 02:06:52,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:06:52,680 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 02:06:52,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:52,681 INFO L225 Difference]: With dead ends: 38 [2021-11-23 02:06:52,681 INFO L226 Difference]: Without dead ends: 38 [2021-11-23 02:06:52,682 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:06:52,683 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 86 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:52,683 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 69 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:06:52,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-23 02:06:52,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 34. [2021-11-23 02:06:52,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 33 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:52,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2021-11-23 02:06:52,689 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 8 [2021-11-23 02:06:52,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:52,690 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2021-11-23 02:06:52,690 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 02:06:52,690 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2021-11-23 02:06:52,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 02:06:52,691 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:52,691 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:52,705 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:06:52,901 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:06:52,902 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:06:52,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:52,902 INFO L85 PathProgramCache]: Analyzing trace with hash -1091210163, now seen corresponding path program 1 times [2021-11-23 02:06:52,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:06:52,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1191099095] [2021-11-23 02:06:52,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:52,903 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:06:52,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:06:52,904 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:06:52,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 02:06:52,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:52,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:06:52,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:53,049 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 02:06:53,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:06:53,128 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 02:06:53,128 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:06:53,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1191099095] [2021-11-23 02:06:53,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1191099095] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:06:53,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [263173064] [2021-11-23 02:06:53,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:53,129 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:06:53,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:06:53,130 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:06:53,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-23 02:06:53,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:53,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:06:53,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:53,302 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 02:06:53,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:06:53,348 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 02:06:53,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [263173064] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:06:53,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [687018745] [2021-11-23 02:06:53,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:53,350 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:06:53,350 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:06:53,353 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:06:53,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:06:53,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:53,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:06:53,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:53,475 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 02:06:53,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:06:53,510 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 02:06:53,510 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [687018745] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:06:53,510 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:06:53,511 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-23 02:06:53,511 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965284212] [2021-11-23 02:06:53,511 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:06:53,512 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:06:53,512 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:06:53,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:06:53,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:06:53,514 INFO L87 Difference]: Start difference. First operand 34 states and 38 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 02:06:53,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:53,624 INFO L93 Difference]: Finished difference Result 63 states and 69 transitions. [2021-11-23 02:06:53,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:06:53,625 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 02:06:53,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:53,625 INFO L225 Difference]: With dead ends: 63 [2021-11-23 02:06:53,626 INFO L226 Difference]: Without dead ends: 63 [2021-11-23 02:06:53,626 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 02:06:53,629 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 55 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:53,630 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 168 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:06:53,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-23 02:06:53,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 40. [2021-11-23 02:06:53,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 39 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:53,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2021-11-23 02:06:53,636 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 10 [2021-11-23 02:06:53,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:53,636 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2021-11-23 02:06:53,637 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 02:06:53,637 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2021-11-23 02:06:53,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 02:06:53,637 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:53,638 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:53,649 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-11-23 02:06:53,847 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:06:54,071 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-23 02:06:54,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:06:54,247 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:06:54,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:54,247 INFO L85 PathProgramCache]: Analyzing trace with hash -1900556789, now seen corresponding path program 1 times [2021-11-23 02:06:54,248 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:06:54,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [762330170] [2021-11-23 02:06:54,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:54,248 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:06:54,248 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:06:54,249 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:06:54,250 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 02:06:54,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:54,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 02:06:54,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:54,328 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 02:06:54,598 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 02:06:54,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:06:55,263 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 02:06:55,263 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:06:55,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [762330170] [2021-11-23 02:06:55,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [762330170] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:06:55,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [231578339] [2021-11-23 02:06:55,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:55,264 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:06:55,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:06:55,269 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:06:55,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-11-23 02:06:55,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:55,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:06:55,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:55,446 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 02:06:55,629 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 02:06:55,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:06:55,926 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 02:06:55,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [231578339] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:06:55,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1948711139] [2021-11-23 02:06:55,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:55,927 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:06:55,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:06:55,932 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:06:55,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:06:55,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:55,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:06:55,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:56,012 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 02:06:56,105 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 02:06:56,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:06:56,333 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 02:06:56,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1948711139] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:06:56,334 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:06:56,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 12 [2021-11-23 02:06:56,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186882893] [2021-11-23 02:06:56,334 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:06:56,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 02:06:56,336 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:06:56,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 02:06:56,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:06:56,337 INFO L87 Difference]: Start difference. First operand 40 states and 44 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 02:06:57,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:57,146 INFO L93 Difference]: Finished difference Result 71 states and 79 transitions. [2021-11-23 02:06:57,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:06:57,147 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 02:06:57,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:57,148 INFO L225 Difference]: With dead ends: 71 [2021-11-23 02:06:57,148 INFO L226 Difference]: Without dead ends: 71 [2021-11-23 02:06:57,148 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:06:57,149 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 125 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 4 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:57,149 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 107 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 114 Invalid, 0 Unknown, 4 Unchecked, 0.7s Time] [2021-11-23 02:06:57,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-23 02:06:57,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 48. [2021-11-23 02:06:57,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 41 states have (on average 1.3170731707317074) internal successors, (54), 47 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 02:06:57,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 54 transitions. [2021-11-23 02:06:57,154 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 54 transitions. Word has length 10 [2021-11-23 02:06:57,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:57,155 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 54 transitions. [2021-11-23 02:06:57,155 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 02:06:57,155 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 54 transitions. [2021-11-23 02:06:57,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 02:06:57,156 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:57,156 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:57,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:06:57,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:06:57,566 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:06:57,764 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:06:57,765 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:06:57,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:57,765 INFO L85 PathProgramCache]: Analyzing trace with hash -680998151, now seen corresponding path program 1 times [2021-11-23 02:06:57,766 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:06:57,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [645301097] [2021-11-23 02:06:57,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:57,766 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:06:57,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:06:57,775 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:06:57,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 02:06:57,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:57,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:06:57,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:57,878 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 02:06:57,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:06:57,942 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 02:06:57,942 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:06:57,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [645301097] [2021-11-23 02:06:57,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [645301097] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:57,942 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:57,943 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-23 02:06:57,943 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429868894] [2021-11-23 02:06:57,943 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:57,944 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:06:57,944 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:06:57,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:06:57,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:06:57,945 INFO L87 Difference]: Start difference. First operand 48 states and 54 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:58,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:58,016 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2021-11-23 02:06:58,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:06:58,016 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-23 02:06:58,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:58,017 INFO L225 Difference]: With dead ends: 53 [2021-11-23 02:06:58,017 INFO L226 Difference]: Without dead ends: 53 [2021-11-23 02:06:58,017 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:06:58,018 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 12 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:58,019 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 115 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:06:58,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-23 02:06:58,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2021-11-23 02:06:58,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 43 states have (on average 1.302325581395349) internal successors, (56), 49 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:58,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 56 transitions. [2021-11-23 02:06:58,027 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 56 transitions. Word has length 12 [2021-11-23 02:06:58,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:58,027 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 56 transitions. [2021-11-23 02:06:58,028 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:58,028 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 56 transitions. [2021-11-23 02:06:58,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 02:06:58,029 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:58,029 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:58,037 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 02:06:58,237 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:06:58,237 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:06:58,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:06:58,238 INFO L85 PathProgramCache]: Analyzing trace with hash -1074025161, now seen corresponding path program 1 times [2021-11-23 02:06:58,238 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:06:58,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [115393812] [2021-11-23 02:06:58,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:06:58,239 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:06:58,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:06:58,240 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:06:58,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 02:06:58,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:06:58,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:06:58,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:06:58,339 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 02:06:58,566 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 02:06:58,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:06:59,214 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 02:06:59,215 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:06:59,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [115393812] [2021-11-23 02:06:59,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [115393812] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:06:59,215 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:06:59,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 9 [2021-11-23 02:06:59,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376395570] [2021-11-23 02:06:59,215 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:06:59,216 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 02:06:59,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:06:59,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 02:06:59,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:06:59,218 INFO L87 Difference]: Start difference. First operand 50 states and 56 transitions. Second operand has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 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 02:06:59,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:06:59,813 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2021-11-23 02:06:59,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:06:59,814 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 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 12 [2021-11-23 02:06:59,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:06:59,815 INFO L225 Difference]: With dead ends: 55 [2021-11-23 02:06:59,815 INFO L226 Difference]: Without dead ends: 55 [2021-11-23 02:06:59,816 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:06:59,816 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 24 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:06:59,817 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 136 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 77 Invalid, 0 Unknown, 1 Unchecked, 0.3s Time] [2021-11-23 02:06:59,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-23 02:06:59,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2021-11-23 02:06:59,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 45 states have (on average 1.3111111111111111) internal successors, (59), 51 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:06:59,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 59 transitions. [2021-11-23 02:06:59,822 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 59 transitions. Word has length 12 [2021-11-23 02:06:59,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:06:59,822 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 59 transitions. [2021-11-23 02:06:59,822 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 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 02:06:59,822 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 59 transitions. [2021-11-23 02:06:59,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 02:06:59,823 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:06:59,823 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:06:59,837 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:00,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:07:00,034 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:07:00,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:00,034 INFO L85 PathProgramCache]: Analyzing trace with hash 363893229, now seen corresponding path program 1 times [2021-11-23 02:07:00,035 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:07:00,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1377730582] [2021-11-23 02:07:00,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:00,035 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:07:00,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:07:00,038 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:07:00,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-23 02:07:00,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:00,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:07:00,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:00,173 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:07:00,173 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:04,288 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 02:07:04,288 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:07:04,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1377730582] [2021-11-23 02:07:04,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1377730582] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:04,289 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:04,289 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-23 02:07:04,289 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324592877] [2021-11-23 02:07:04,289 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:04,289 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:07:04,290 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:07:04,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:07:04,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=25, Unknown=2, NotChecked=0, Total=42 [2021-11-23 02:07:04,290 INFO L87 Difference]: Start difference. First operand 52 states and 59 transitions. Second operand has 7 states, 6 states have (on average 4.166666666666667) internal successors, (25), 7 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 02:07:04,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:04,386 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2021-11-23 02:07:04,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:07:04,387 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.166666666666667) internal successors, (25), 7 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-23 02:07:04,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:04,388 INFO L225 Difference]: With dead ends: 51 [2021-11-23 02:07:04,388 INFO L226 Difference]: Without dead ends: 41 [2021-11-23 02:07:04,389 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=15, Invalid=25, Unknown=2, NotChecked=0, Total=42 [2021-11-23 02:07:04,389 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 24 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:04,390 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 79 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 18 Unchecked, 0.1s Time] [2021-11-23 02:07:04,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-23 02:07:04,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-23 02:07:04,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 40 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:04,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2021-11-23 02:07:04,395 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 13 [2021-11-23 02:07:04,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:04,395 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2021-11-23 02:07:04,395 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.166666666666667) internal successors, (25), 7 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 02:07:04,395 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2021-11-23 02:07:04,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 02:07:04,396 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:04,397 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:04,422 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:04,597 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:07:04,597 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:07:04,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:04,598 INFO L85 PathProgramCache]: Analyzing trace with hash -749048740, now seen corresponding path program 1 times [2021-11-23 02:07:04,598 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:07:04,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [644179159] [2021-11-23 02:07:04,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:04,598 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:07:04,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:07:04,599 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:07:04,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 02:07:04,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:04,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 02:07:04,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:04,667 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 13 treesize of output 12 [2021-11-23 02:07:05,133 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 02:07:05,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:06,397 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 02:07:06,397 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:07:06,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [644179159] [2021-11-23 02:07:06,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [644179159] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:06,398 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:06,398 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [] total 10 [2021-11-23 02:07:06,398 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937858421] [2021-11-23 02:07:06,398 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:06,398 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 02:07:06,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:07:06,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 02:07:06,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:07:06,400 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand has 11 states, 10 states have (on average 3.0) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:06,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:06,828 INFO L93 Difference]: Finished difference Result 48 states and 57 transitions. [2021-11-23 02:07:06,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:07:06,830 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.0) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-23 02:07:06,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:06,831 INFO L225 Difference]: With dead ends: 48 [2021-11-23 02:07:06,831 INFO L226 Difference]: Without dead ends: 48 [2021-11-23 02:07:06,831 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:07:06,832 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 7 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 25 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:06,832 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 92 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 25 Unchecked, 0.3s Time] [2021-11-23 02:07:06,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-23 02:07:06,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 45. [2021-11-23 02:07:06,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 44 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:06,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 51 transitions. [2021-11-23 02:07:06,843 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 51 transitions. Word has length 16 [2021-11-23 02:07:06,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:06,844 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 51 transitions. [2021-11-23 02:07:06,844 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.0) internal successors, (30), 11 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:06,844 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 51 transitions. [2021-11-23 02:07:06,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-23 02:07:06,846 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:06,846 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:06,862 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:07,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:07:07,047 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:07:07,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:07,053 INFO L85 PathProgramCache]: Analyzing trace with hash -1745668404, now seen corresponding path program 1 times [2021-11-23 02:07:07,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:07:07,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1176950968] [2021-11-23 02:07:07,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:07,054 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:07:07,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:07:07,054 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:07:07,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 02:07:07,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:07,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:07:07,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:07,179 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 02:07:07,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:07,238 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 02:07:07,238 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:07:07,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1176950968] [2021-11-23 02:07:07,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1176950968] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:07,238 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:07,238 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2021-11-23 02:07:07,239 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63433789] [2021-11-23 02:07:07,239 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:07,239 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:07:07,239 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:07:07,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:07:07,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:07:07,240 INFO L87 Difference]: Start difference. First operand 45 states and 51 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 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 02:07:07,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:07,684 INFO L93 Difference]: Finished difference Result 113 states and 124 transitions. [2021-11-23 02:07:07,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 02:07:07,685 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 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 17 [2021-11-23 02:07:07,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:07,686 INFO L225 Difference]: With dead ends: 113 [2021-11-23 02:07:07,686 INFO L226 Difference]: Without dead ends: 113 [2021-11-23 02:07:07,686 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:07:07,687 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 123 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:07,687 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 92 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:07:07,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-23 02:07:07,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 61. [2021-11-23 02:07:07,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 55 states have (on average 1.3272727272727274) internal successors, (73), 60 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:07,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 73 transitions. [2021-11-23 02:07:07,708 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 73 transitions. Word has length 17 [2021-11-23 02:07:07,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:07,708 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 73 transitions. [2021-11-23 02:07:07,709 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 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 02:07:07,709 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 73 transitions. [2021-11-23 02:07:07,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-23 02:07:07,710 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:07,710 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1] [2021-11-23 02:07:07,726 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:07,922 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:07:07,923 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:07:07,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:07,923 INFO L85 PathProgramCache]: Analyzing trace with hash -1817992175, now seen corresponding path program 2 times [2021-11-23 02:07:07,923 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:07:07,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1276997144] [2021-11-23 02:07:07,924 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:07:07,924 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:07:07,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:07:07,924 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:07:07,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 02:07:07,974 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:07:07,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:07:07,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:07:07,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:08,020 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 02:07:08,482 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 02:07:08,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:09,945 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 02:07:09,945 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:07:09,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1276997144] [2021-11-23 02:07:09,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1276997144] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:09,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1077176421] [2021-11-23 02:07:09,946 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:07:09,946 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:07:09,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:07:09,949 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:07:09,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-11-23 02:07:10,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:07:10,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:07:10,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 02:07:10,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:10,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 02:07:10,620 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 02:07:10,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:11,259 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 02:07:11,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1077176421] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:11,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1361762518] [2021-11-23 02:07:11,260 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:07:11,260 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:11,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:07:11,265 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:07:11,288 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 02:07:11,338 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:07:11,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:07:11,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:07:11,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:11,367 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 02:07:11,799 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 02:07:11,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:13,342 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 02:07:13,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1361762518] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:13,342 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:07:13,342 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 8, 8] total 24 [2021-11-23 02:07:13,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277141383] [2021-11-23 02:07:13,343 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:07:13,343 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 02:07:13,343 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:07:13,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 02:07:13,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=425, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:07:13,344 INFO L87 Difference]: Start difference. First operand 61 states and 73 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 02:07:17,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:17,295 INFO L93 Difference]: Finished difference Result 287 states and 348 transitions. [2021-11-23 02:07:17,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 02:07:17,297 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 02:07:17,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:17,299 INFO L225 Difference]: With dead ends: 287 [2021-11-23 02:07:17,299 INFO L226 Difference]: Without dead ends: 287 [2021-11-23 02:07:17,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=292, Invalid=700, Unknown=0, NotChecked=0, Total=992 [2021-11-23 02:07:17,301 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 502 mSDsluCounter, 336 mSDsCounter, 0 mSdLazyCounter, 487 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 502 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 487 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:17,301 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [502 Valid, 376 Invalid, 513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 487 Invalid, 0 Unknown, 9 Unchecked, 2.3s Time] [2021-11-23 02:07:17,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2021-11-23 02:07:17,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 77. [2021-11-23 02:07:17,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 71 states have (on average 1.3098591549295775) internal successors, (93), 76 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:17,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 93 transitions. [2021-11-23 02:07:17,309 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 93 transitions. Word has length 18 [2021-11-23 02:07:17,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:17,310 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 93 transitions. [2021-11-23 02:07:17,310 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 02:07:17,310 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 93 transitions. [2021-11-23 02:07:17,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 02:07:17,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:17,311 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:17,332 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (18)] Ended with exit code 0 [2021-11-23 02:07:17,519 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:17,737 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-11-23 02:07:17,913 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:17,913 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:07:17,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:17,913 INFO L85 PathProgramCache]: Analyzing trace with hash 1739046953, now seen corresponding path program 1 times [2021-11-23 02:07:17,914 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:07:17,914 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [263818609] [2021-11-23 02:07:17,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:17,914 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:07:17,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:07:17,915 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:07:17,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 02:07:17,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:17,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 02:07:17,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:17,978 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 13 treesize of output 12 [2021-11-23 02:07:18,642 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 02:07:18,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:19,522 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 02:07:19,522 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:07:19,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [263818609] [2021-11-23 02:07:19,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [263818609] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:19,522 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:19,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [] total 10 [2021-11-23 02:07:19,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150536624] [2021-11-23 02:07:19,523 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:19,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 02:07:19,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:07:19,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 02:07:19,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:07:19,524 INFO L87 Difference]: Start difference. First operand 77 states and 93 transitions. Second operand has 11 states, 10 states have (on average 3.6) internal successors, (36), 11 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:19,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:19,819 INFO L93 Difference]: Finished difference Result 81 states and 99 transitions. [2021-11-23 02:07:19,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:07:19,820 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.6) internal successors, (36), 11 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-23 02:07:19,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:19,823 INFO L225 Difference]: With dead ends: 81 [2021-11-23 02:07:19,823 INFO L226 Difference]: Without dead ends: 81 [2021-11-23 02:07:19,823 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:07:19,824 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 4 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 22 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:19,825 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 91 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 22 Unchecked, 0.2s Time] [2021-11-23 02:07:19,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-23 02:07:19,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2021-11-23 02:07:19,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 74 states have (on average 1.3108108108108107) internal successors, (97), 79 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:19,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 97 transitions. [2021-11-23 02:07:19,832 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 97 transitions. Word has length 19 [2021-11-23 02:07:19,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:19,833 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 97 transitions. [2021-11-23 02:07:19,833 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.6) internal successors, (36), 11 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:19,833 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 97 transitions. [2021-11-23 02:07:19,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 02:07:19,834 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:19,834 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:19,851 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:20,047 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:07:20,047 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:07:20,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:20,048 INFO L85 PathProgramCache]: Analyzing trace with hash 1739047003, now seen corresponding path program 1 times [2021-11-23 02:07:20,048 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:07:20,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1400900547] [2021-11-23 02:07:20,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:20,048 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:07:20,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:07:20,049 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:07:20,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 02:07:20,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:20,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:07:20,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:20,272 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 02:07:20,272 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:20,415 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 10 treesize of output 8 [2021-11-23 02:07:20,702 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 02:07:20,702 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:07:20,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1400900547] [2021-11-23 02:07:20,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1400900547] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:20,703 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:20,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 9 [2021-11-23 02:07:20,703 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966835336] [2021-11-23 02:07:20,703 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:20,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 02:07:20,704 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:07:20,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 02:07:20,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:07:20,705 INFO L87 Difference]: Start difference. First operand 80 states and 97 transitions. Second operand has 10 states, 9 states have (on average 3.888888888888889) internal successors, (35), 10 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 02:07:22,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:22,197 INFO L93 Difference]: Finished difference Result 134 states and 152 transitions. [2021-11-23 02:07:22,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:07:22,198 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.888888888888889) internal successors, (35), 10 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 02:07:22,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:22,199 INFO L225 Difference]: With dead ends: 134 [2021-11-23 02:07:22,199 INFO L226 Difference]: Without dead ends: 134 [2021-11-23 02:07:22,200 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=114, Invalid=228, Unknown=0, NotChecked=0, Total=342 [2021-11-23 02:07:22,200 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 189 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:22,201 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [189 Valid, 92 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-23 02:07:22,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-11-23 02:07:22,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 84. [2021-11-23 02:07:22,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 78 states have (on average 1.3205128205128205) internal successors, (103), 83 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:22,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 103 transitions. [2021-11-23 02:07:22,207 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 103 transitions. Word has length 19 [2021-11-23 02:07:22,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:22,207 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 103 transitions. [2021-11-23 02:07:22,208 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.888888888888889) internal successors, (35), 10 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 02:07:22,208 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 103 transitions. [2021-11-23 02:07:22,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-23 02:07:22,209 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:22,209 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 02:07:22,229 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:22,421 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:07:22,421 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:07:22,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:22,422 INFO L85 PathProgramCache]: Analyzing trace with hash -1924117753, now seen corresponding path program 1 times [2021-11-23 02:07:22,422 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:07:22,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [13501174] [2021-11-23 02:07:22,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:22,422 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:07:22,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:07:22,424 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:07:22,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 02:07:22,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:22,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 02:07:22,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:22,503 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 13 treesize of output 12 [2021-11-23 02:07:24,301 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 02:07:24,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:25,143 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 02:07:25,143 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:07:25,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [13501174] [2021-11-23 02:07:25,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [13501174] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 02:07:25,144 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:07:25,144 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [] total 10 [2021-11-23 02:07:25,144 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503213511] [2021-11-23 02:07:25,144 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 02:07:25,144 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 02:07:25,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:07:25,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 02:07:25,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:07:25,145 INFO L87 Difference]: Start difference. First operand 84 states and 103 transitions. Second operand has 11 states, 10 states have (on average 3.8) internal successors, (38), 11 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:25,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:25,373 INFO L93 Difference]: Finished difference Result 86 states and 105 transitions. [2021-11-23 02:07:25,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:07:25,374 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.8) internal successors, (38), 11 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-23 02:07:25,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:25,375 INFO L225 Difference]: With dead ends: 86 [2021-11-23 02:07:25,375 INFO L226 Difference]: Without dead ends: 86 [2021-11-23 02:07:25,375 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:07:25,376 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 2 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 20 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:25,376 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 84 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 20 Unchecked, 0.2s Time] [2021-11-23 02:07:25,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-23 02:07:25,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-11-23 02:07:25,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 80 states have (on average 1.3125) internal successors, (105), 85 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:25,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 105 transitions. [2021-11-23 02:07:25,381 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 105 transitions. Word has length 20 [2021-11-23 02:07:25,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:25,382 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 105 transitions. [2021-11-23 02:07:25,382 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.8) internal successors, (38), 11 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:25,382 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 105 transitions. [2021-11-23 02:07:25,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-23 02:07:25,383 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:25,383 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:25,404 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:25,594 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:07:25,594 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:07:25,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:25,595 INFO L85 PathProgramCache]: Analyzing trace with hash 2052266087, now seen corresponding path program 1 times [2021-11-23 02:07:25,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:07:25,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1944500714] [2021-11-23 02:07:25,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:25,595 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:07:25,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:07:25,596 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:07:25,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 02:07:25,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:25,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:07:25,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:25,688 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 02:07:25,959 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:07:25,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:27,309 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:07:27,309 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:07:27,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1944500714] [2021-11-23 02:07:27,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1944500714] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:27,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1186146071] [2021-11-23 02:07:27,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:27,310 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:07:27,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:07:27,311 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:07:27,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-23 02:07:27,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:27,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:07:27,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:27,630 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 02:07:27,631 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:27,911 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 02:07:27,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1186146071] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:27,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [633976459] [2021-11-23 02:07:27,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:27,912 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:27,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:07:27,918 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:07:27,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 02:07:27,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:27,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:07:27,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:27,977 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 02:07:28,112 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:07:28,113 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:28,630 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:07:28,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [633976459] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:28,631 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:07:28,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 7, 6, 7, 8] total 22 [2021-11-23 02:07:28,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340395923] [2021-11-23 02:07:28,631 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:07:28,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 02:07:28,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:07:28,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 02:07:28,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2021-11-23 02:07:28,633 INFO L87 Difference]: Start difference. First operand 86 states and 105 transitions. Second operand has 22 states, 22 states have (on average 2.727272727272727) internal successors, (60), 22 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:29,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:29,590 INFO L93 Difference]: Finished difference Result 88 states and 106 transitions. [2021-11-23 02:07:29,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:07:29,591 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.727272727272727) internal successors, (60), 22 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-23 02:07:29,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:29,608 INFO L225 Difference]: With dead ends: 88 [2021-11-23 02:07:29,608 INFO L226 Difference]: Without dead ends: 86 [2021-11-23 02:07:29,609 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:07:29,610 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 62 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 45 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:29,610 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 150 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 189 Invalid, 0 Unknown, 45 Unchecked, 0.8s Time] [2021-11-23 02:07:29,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-23 02:07:29,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-11-23 02:07:29,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 80 states have (on average 1.3) internal successors, (104), 85 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:29,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 104 transitions. [2021-11-23 02:07:29,615 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 104 transitions. Word has length 22 [2021-11-23 02:07:29,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:29,615 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 104 transitions. [2021-11-23 02:07:29,616 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.727272727272727) internal successors, (60), 22 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:29,616 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 104 transitions. [2021-11-23 02:07:29,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 02:07:29,621 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:29,622 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:29,624 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:29,830 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (23)] Ended with exit code 0 [2021-11-23 02:07:30,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:30,224 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:30,224 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:07:30,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:30,225 INFO L85 PathProgramCache]: Analyzing trace with hash -1808251990, now seen corresponding path program 2 times [2021-11-23 02:07:30,225 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:07:30,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1972666797] [2021-11-23 02:07:30,225 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:07:30,225 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:07:30,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:07:30,226 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:07:30,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 02:07:30,298 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:07:30,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:07:30,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:07:30,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:30,334 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 02:07:30,877 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:07:30,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:32,191 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:07:32,191 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:07:32,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1972666797] [2021-11-23 02:07:32,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1972666797] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:32,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [648860743] [2021-11-23 02:07:32,192 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:07:32,192 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:07:32,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:07:32,193 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:07:32,194 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-23 02:07:32,292 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:07:32,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:07:32,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 02:07:32,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:32,821 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:07:32,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:33,614 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:07:33,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [648860743] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:33,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1269881231] [2021-11-23 02:07:33,614 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:07:33,615 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:33,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:07:33,620 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:07:33,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-23 02:07:33,680 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:07:33,680 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:07:33,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:07:33,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:33,706 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 02:07:34,043 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:07:34,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:34,841 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:07:34,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1269881231] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:34,841 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:07:34,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 10, 9, 7, 7] total 28 [2021-11-23 02:07:34,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830251408] [2021-11-23 02:07:34,842 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:07:34,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 02:07:34,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:07:34,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 02:07:34,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=638, Unknown=0, NotChecked=0, Total=756 [2021-11-23 02:07:34,843 INFO L87 Difference]: Start difference. First operand 86 states and 104 transitions. Second operand has 28 states, 28 states have (on average 3.142857142857143) internal successors, (88), 28 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:38,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:38,134 INFO L93 Difference]: Finished difference Result 139 states and 158 transitions. [2021-11-23 02:07:38,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 02:07:38,135 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.142857142857143) internal successors, (88), 28 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-23 02:07:38,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:38,136 INFO L225 Difference]: With dead ends: 139 [2021-11-23 02:07:38,136 INFO L226 Difference]: Without dead ends: 136 [2021-11-23 02:07:38,137 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=321, Invalid=1401, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 02:07:38,138 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 360 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 418 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 360 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 418 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 62 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:38,139 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [360 Valid, 279 Invalid, 514 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 418 Invalid, 0 Unknown, 62 Unchecked, 1.7s Time] [2021-11-23 02:07:38,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-23 02:07:38,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 124. [2021-11-23 02:07:38,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 118 states have (on average 1.305084745762712) internal successors, (154), 123 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:38,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 154 transitions. [2021-11-23 02:07:38,144 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 154 transitions. Word has length 26 [2021-11-23 02:07:38,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:38,144 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 154 transitions. [2021-11-23 02:07:38,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 3.142857142857143) internal successors, (88), 28 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:38,145 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 154 transitions. [2021-11-23 02:07:38,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 02:07:38,146 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:38,146 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:38,152 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:38,368 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:38,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:38,748 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:07:38,748 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:07:38,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:38,748 INFO L85 PathProgramCache]: Analyzing trace with hash -1073263164, now seen corresponding path program 1 times [2021-11-23 02:07:38,749 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:07:38,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [582943025] [2021-11-23 02:07:38,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:38,749 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:07:38,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:07:38,750 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:07:38,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 02:07:38,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:38,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:07:38,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:38,859 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:07:38,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:38,965 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:07:38,965 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:07:38,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [582943025] [2021-11-23 02:07:38,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [582943025] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:38,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [196769225] [2021-11-23 02:07:38,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:38,966 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:07:38,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:07:38,966 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:07:38,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-23 02:07:39,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:39,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:07:39,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:39,162 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:07:39,163 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:39,246 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:07:39,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [196769225] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:39,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [186086493] [2021-11-23 02:07:39,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:39,247 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:39,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:07:39,252 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:07:39,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-23 02:07:39,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:39,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:07:39,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:39,368 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:07:39,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:39,445 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:07:39,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [186086493] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:39,446 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:07:39,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 9 [2021-11-23 02:07:39,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382918850] [2021-11-23 02:07:39,446 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:07:39,446 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:07:39,446 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:07:39,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:07:39,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:07:39,447 INFO L87 Difference]: Start difference. First operand 124 states and 154 transitions. Second operand has 9 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 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 02:07:39,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:39,653 INFO L93 Difference]: Finished difference Result 114 states and 128 transitions. [2021-11-23 02:07:39,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:07:39,654 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 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 29 [2021-11-23 02:07:39,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:39,655 INFO L225 Difference]: With dead ends: 114 [2021-11-23 02:07:39,655 INFO L226 Difference]: Without dead ends: 114 [2021-11-23 02:07:39,656 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:07:39,656 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 47 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:39,657 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 124 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:07:39,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-23 02:07:39,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 109. [2021-11-23 02:07:39,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.1923076923076923) internal successors, (124), 108 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:39,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 124 transitions. [2021-11-23 02:07:39,660 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 124 transitions. Word has length 29 [2021-11-23 02:07:39,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:39,661 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 124 transitions. [2021-11-23 02:07:39,661 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.333333333333333) internal successors, (39), 9 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 02:07:39,661 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 124 transitions. [2021-11-23 02:07:39,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 02:07:39,662 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:39,662 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:07:39,685 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:39,879 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (29)] Ended with exit code 0 [2021-11-23 02:07:40,073 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (30)] Ended with exit code 0 [2021-11-23 02:07:40,272 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:07:40,273 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:07:40,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:40,273 INFO L85 PathProgramCache]: Analyzing trace with hash 1088586340, now seen corresponding path program 1 times [2021-11-23 02:07:40,273 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:07:40,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1044795130] [2021-11-23 02:07:40,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:40,273 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:07:40,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:07:40,275 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:07:40,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 02:07:40,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:40,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:07:40,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:40,352 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 13 treesize of output 12 [2021-11-23 02:07:40,889 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:07:40,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:42,406 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:07:42,406 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:07:42,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1044795130] [2021-11-23 02:07:42,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1044795130] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:42,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1455965171] [2021-11-23 02:07:42,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:42,406 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:07:42,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:07:42,407 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:07:42,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (33)] Waiting until timeout for monitored process [2021-11-23 02:07:42,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:42,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:07:42,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:42,559 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 02:07:43,570 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:07:43,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:45,054 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:07:45,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1455965171] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:45,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [582230878] [2021-11-23 02:07:45,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:07:45,055 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:07:45,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:07:45,056 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:07:45,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-23 02:07:45,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:07:45,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:07:45,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:45,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2021-11-23 02:07:45,621 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:07:45,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:46,379 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:07:46,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [582230878] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:46,379 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:07:46,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 10, 9, 7, 6] total 25 [2021-11-23 02:07:46,380 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853629] [2021-11-23 02:07:46,380 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:07:46,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 02:07:46,381 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:07:46,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 02:07:46,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=543, Unknown=0, NotChecked=0, Total=650 [2021-11-23 02:07:46,382 INFO L87 Difference]: Start difference. First operand 109 states and 124 transitions. Second operand has 26 states, 25 states have (on average 3.6) internal successors, (90), 26 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:47,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:07:47,303 INFO L93 Difference]: Finished difference Result 109 states and 122 transitions. [2021-11-23 02:07:47,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 02:07:47,305 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 3.6) internal successors, (90), 26 states have internal predecessors, (90), 0 states have call successors, (0), 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 30 [2021-11-23 02:07:47,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:07:47,305 INFO L225 Difference]: With dead ends: 109 [2021-11-23 02:07:47,305 INFO L226 Difference]: Without dead ends: 92 [2021-11-23 02:07:47,306 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 149 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=180, Invalid=812, Unknown=0, NotChecked=0, Total=992 [2021-11-23 02:07:47,306 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 38 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 71 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:07:47,307 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 190 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 108 Invalid, 0 Unknown, 71 Unchecked, 0.4s Time] [2021-11-23 02:07:47,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-23 02:07:47,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2021-11-23 02:07:47,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.2093023255813953) internal successors, (104), 90 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:47,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 104 transitions. [2021-11-23 02:07:47,310 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 104 transitions. Word has length 30 [2021-11-23 02:07:47,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:07:47,310 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 104 transitions. [2021-11-23 02:07:47,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 3.6) internal successors, (90), 26 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:07:47,311 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 104 transitions. [2021-11-23 02:07:47,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-23 02:07:47,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:07:47,312 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1] [2021-11-23 02:07:47,342 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:47,540 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (32)] Ended with exit code 0 [2021-11-23 02:07:47,734 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (33)] Forceful destruction successful, exit code 0 [2021-11-23 02:07:47,933 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:07:47,933 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:07:47,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:07:47,933 INFO L85 PathProgramCache]: Analyzing trace with hash -563143139, now seen corresponding path program 3 times [2021-11-23 02:07:47,934 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:07:47,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1421535899] [2021-11-23 02:07:47,934 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:07:47,934 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:07:47,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:07:47,935 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:07:48,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 02:07:48,093 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-23 02:07:48,093 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:07:48,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:07:48,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:48,120 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 02:07:49,029 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 02:07:49,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:07:53,353 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 02:07:53,353 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:07:53,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1421535899] [2021-11-23 02:07:53,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1421535899] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:07:53,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [532937069] [2021-11-23 02:07:53,354 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:07:53,354 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:07:53,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:07:53,355 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:07:53,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-23 02:07:53,681 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-23 02:07:53,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:07:53,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:07:53,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:07:53,844 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 02:07:54,830 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 02:07:54,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:08:05,788 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 02:08:05,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [532937069] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:08:05,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [215555813] [2021-11-23 02:08:05,789 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:08:05,789 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:08:05,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:08:05,791 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:08:05,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-23 02:08:06,920 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-23 02:08:06,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:08:06,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:08:06,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:08:06,944 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 02:08:07,704 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 02:08:07,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:08:14,519 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 02:08:14,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [215555813] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:08:14,520 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:08:14,520 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 15, 15, 14, 14] total 51 [2021-11-23 02:08:14,520 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082026409] [2021-11-23 02:08:14,520 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:08:14,521 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-23 02:08:14,521 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:08:14,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-23 02:08:14,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=733, Invalid=1919, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 02:08:14,523 INFO L87 Difference]: Start difference. First operand 91 states and 104 transitions. Second operand has 52 states, 51 states have (on average 2.9019607843137254) internal successors, (148), 52 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:08:19,710 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.51s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:21,713 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:23,745 WARN L534 Checker$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 02:08:25,821 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:35,172 WARN L534 Checker$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 02:08:37,194 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:39,256 WARN L534 Checker$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 02:08:46,307 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:08:48,364 WARN L534 Checker$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 02:08:54,070 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 02:09:04,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:04,867 INFO L93 Difference]: Finished difference Result 739 states and 848 transitions. [2021-11-23 02:09:04,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 02:09:04,869 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 2.9019607843137254) internal successors, (148), 52 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-23 02:09:04,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:04,873 INFO L225 Difference]: With dead ends: 739 [2021-11-23 02:09:04,873 INFO L226 Difference]: Without dead ends: 739 [2021-11-23 02:09:04,875 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 149 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2030 ImplicationChecksByTransitivity, 32.1s TimeCoverageRelationStatistics Valid=1298, Invalid=3258, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 02:09:04,875 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 2019 mSDsluCounter, 970 mSDsCounter, 0 mSdLazyCounter, 1220 mSolverCounterSat, 81 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 29.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2019 SdHoareTripleChecker+Valid, 1036 SdHoareTripleChecker+Invalid, 1392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 1220 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 82 IncrementalHoareTripleChecker+Unchecked, 29.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:04,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2019 Valid, 1036 Invalid, 1392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 1220 Invalid, 9 Unknown, 82 Unchecked, 29.9s Time] [2021-11-23 02:09:04,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 739 states. [2021-11-23 02:09:04,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 739 to 123. [2021-11-23 02:09:04,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 118 states have (on average 1.2203389830508475) internal successors, (144), 122 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:04,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 144 transitions. [2021-11-23 02:09:04,885 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 144 transitions. Word has length 34 [2021-11-23 02:09:04,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:04,885 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 144 transitions. [2021-11-23 02:09:04,896 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 2.9019607843137254) internal successors, (148), 52 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:04,897 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 144 transitions. [2021-11-23 02:09:04,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-23 02:09:04,897 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:04,897 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:04,899 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (36)] Ended with exit code 0 [2021-11-23 02:09:05,126 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2021-11-23 02:09:05,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:05,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:09:05,498 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:09:05,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:05,499 INFO L85 PathProgramCache]: Analyzing trace with hash 589547922, now seen corresponding path program 1 times [2021-11-23 02:09:05,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:09:05,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1834103954] [2021-11-23 02:09:05,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:05,499 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:09:05,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:09:05,500 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:09:05,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-23 02:09:05,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:05,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:09:05,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:05,574 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 13 treesize of output 12 [2021-11-23 02:09:06,247 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:09:06,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:07,800 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:09:07,800 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:09:07,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1834103954] [2021-11-23 02:09:07,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1834103954] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:07,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1103269147] [2021-11-23 02:09:07,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:07,801 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:07,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:09:07,801 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:09:07,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (39)] Waiting until timeout for monitored process [2021-11-23 02:09:07,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:07,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 02:09:07,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:07,952 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 02:09:09,375 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:09:09,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:11,473 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:09:11,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1103269147] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:11,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2045614132] [2021-11-23 02:09:11,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:11,474 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:11,474 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:11,475 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:11,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-23 02:09:11,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:11,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:09:11,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:11,559 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 13 treesize of output 12 [2021-11-23 02:09:12,167 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:09:12,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:12,967 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:09:12,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2045614132] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:12,967 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:09:12,967 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 11, 10, 7, 6] total 27 [2021-11-23 02:09:12,967 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509429959] [2021-11-23 02:09:12,967 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:12,968 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 02:09:12,968 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:09:12,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 02:09:12,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=631, Unknown=0, NotChecked=0, Total=756 [2021-11-23 02:09:12,969 INFO L87 Difference]: Start difference. First operand 123 states and 144 transitions. Second operand has 28 states, 27 states have (on average 3.6296296296296298) internal successors, (98), 28 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:15,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:15,705 INFO L93 Difference]: Finished difference Result 167 states and 192 transitions. [2021-11-23 02:09:15,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 02:09:15,707 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 3.6296296296296298) internal successors, (98), 28 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-23 02:09:15,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:15,708 INFO L225 Difference]: With dead ends: 167 [2021-11-23 02:09:15,708 INFO L226 Difference]: Without dead ends: 167 [2021-11-23 02:09:15,709 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 176 SyntacticMatches, 4 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 478 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=285, Invalid=1437, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 02:09:15,709 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 104 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 129 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:15,710 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 223 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 131 Invalid, 0 Unknown, 129 Unchecked, 0.6s Time] [2021-11-23 02:09:15,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-23 02:09:15,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 141. [2021-11-23 02:09:15,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 136 states have (on average 1.213235294117647) internal successors, (165), 140 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:15,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 165 transitions. [2021-11-23 02:09:15,715 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 165 transitions. Word has length 34 [2021-11-23 02:09:15,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:15,716 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 165 transitions. [2021-11-23 02:09:15,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 3.6296296296296298) internal successors, (98), 28 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:15,716 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 165 transitions. [2021-11-23 02:09:15,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-23 02:09:15,717 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:15,717 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:15,728 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (38)] Ended with exit code 0 [2021-11-23 02:09:15,950 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2021-11-23 02:09:16,129 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (39)] Ended with exit code 0 [2021-11-23 02:09:16,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:16,328 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:09:16,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:16,329 INFO L85 PathProgramCache]: Analyzing trace with hash 1100861235, now seen corresponding path program 1 times [2021-11-23 02:09:16,329 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:09:16,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1245104805] [2021-11-23 02:09:16,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:16,329 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:09:16,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:09:16,331 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:09:16,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-23 02:09:16,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:16,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:09:16,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:16,415 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 13 treesize of output 12 [2021-11-23 02:09:17,428 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:09:17,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:19,202 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:09:19,202 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:09:19,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1245104805] [2021-11-23 02:09:19,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1245104805] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:19,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [209714470] [2021-11-23 02:09:19,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:19,203 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:19,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:09:19,208 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:09:19,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-11-23 02:09:19,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:19,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 02:09:19,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:19,390 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 02:09:20,793 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:09:20,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:23,745 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:09:23,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [209714470] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:23,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [786999389] [2021-11-23 02:09:23,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:23,746 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:23,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:23,747 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:23,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-23 02:09:23,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:23,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:09:23,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:23,820 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 13 treesize of output 12 [2021-11-23 02:09:24,464 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:09:24,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:26,468 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:09:26,468 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [786999389] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:26,468 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:09:26,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 12, 11, 8, 7] total 35 [2021-11-23 02:09:26,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978095308] [2021-11-23 02:09:26,468 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:26,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-23 02:09:26,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:09:26,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-23 02:09:26,474 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=1069, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 02:09:26,474 INFO L87 Difference]: Start difference. First operand 141 states and 165 transitions. Second operand has 36 states, 35 states have (on average 3.7714285714285714) internal successors, (132), 36 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 02:09:29,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:29,612 INFO L93 Difference]: Finished difference Result 169 states and 195 transitions. [2021-11-23 02:09:29,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 02:09:29,615 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 3.7714285714285714) internal successors, (132), 36 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-23 02:09:29,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:29,616 INFO L225 Difference]: With dead ends: 169 [2021-11-23 02:09:29,616 INFO L226 Difference]: Without dead ends: 169 [2021-11-23 02:09:29,617 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 190 SyntacticMatches, 5 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 620 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=288, Invalid=1604, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 02:09:29,618 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 115 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 308 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 93 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:29,618 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [115 Valid, 323 Invalid, 308 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 195 Invalid, 0 Unknown, 93 Unchecked, 1.7s Time] [2021-11-23 02:09:29,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-11-23 02:09:29,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 145. [2021-11-23 02:09:29,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.207142857142857) internal successors, (169), 144 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:29,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 169 transitions. [2021-11-23 02:09:29,623 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 169 transitions. Word has length 37 [2021-11-23 02:09:29,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:29,624 INFO L470 AbstractCegarLoop]: Abstraction has 145 states and 169 transitions. [2021-11-23 02:09:29,624 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 3.7714285714285714) internal successors, (132), 36 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 02:09:29,624 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 169 transitions. [2021-11-23 02:09:29,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 02:09:29,625 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:29,625 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:29,634 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (42)] Ended with exit code 0 [2021-11-23 02:09:29,848 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2021-11-23 02:09:30,034 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (41)] Ended with exit code 0 [2021-11-23 02:09:30,227 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:09:30,227 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:09:30,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:30,228 INFO L85 PathProgramCache]: Analyzing trace with hash -233038531, now seen corresponding path program 1 times [2021-11-23 02:09:30,228 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:09:30,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [400204308] [2021-11-23 02:09:30,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:30,228 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:09:30,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:09:30,229 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:09:30,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-23 02:09:30,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:30,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:09:30,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:30,307 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2021-11-23 02:09:31,148 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:09:31,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:33,077 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:09:33,077 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:09:33,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [400204308] [2021-11-23 02:09:33,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [400204308] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:33,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [30794040] [2021-11-23 02:09:33,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:33,077 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:33,078 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:09:33,078 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:09:33,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (45)] Waiting until timeout for monitored process [2021-11-23 02:09:33,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:33,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 02:09:33,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:33,234 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 02:09:34,643 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:09:34,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:37,873 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:09:37,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [30794040] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:37,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893958719] [2021-11-23 02:09:37,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:37,874 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:37,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:37,875 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:37,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-23 02:09:37,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:37,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:09:37,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:37,961 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 13 treesize of output 12 [2021-11-23 02:09:38,541 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:09:38,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:40,695 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:09:40,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [893958719] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:40,696 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:09:40,696 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 12, 11, 8, 7] total 35 [2021-11-23 02:09:40,696 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945856408] [2021-11-23 02:09:40,696 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:40,697 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-23 02:09:40,697 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:09:40,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-23 02:09:40,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=1069, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 02:09:40,698 INFO L87 Difference]: Start difference. First operand 145 states and 169 transitions. Second operand has 36 states, 35 states have (on average 3.857142857142857) internal successors, (135), 36 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:45,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:45,048 INFO L93 Difference]: Finished difference Result 172 states and 198 transitions. [2021-11-23 02:09:45,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-23 02:09:45,050 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 3.857142857142857) internal successors, (135), 36 states have internal predecessors, (135), 0 states have call successors, (0), 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 38 [2021-11-23 02:09:45,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:45,051 INFO L225 Difference]: With dead ends: 172 [2021-11-23 02:09:45,051 INFO L226 Difference]: Without dead ends: 172 [2021-11-23 02:09:45,052 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 195 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 639 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=288, Invalid=1604, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 02:09:45,053 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 107 mSDsluCounter, 239 mSDsCounter, 0 mSdLazyCounter, 249 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 28 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:45,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 261 Invalid, 297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 249 Invalid, 0 Unknown, 28 Unchecked, 2.7s Time] [2021-11-23 02:09:45,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-11-23 02:09:45,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 149. [2021-11-23 02:09:45,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 144 states have (on average 1.2013888888888888) internal successors, (173), 148 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:45,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 173 transitions. [2021-11-23 02:09:45,060 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 173 transitions. Word has length 38 [2021-11-23 02:09:45,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:45,062 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 173 transitions. [2021-11-23 02:09:45,062 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 3.857142857142857) internal successors, (135), 36 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:45,062 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 173 transitions. [2021-11-23 02:09:45,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 02:09:45,063 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:45,063 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:45,101 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:45,285 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (44)] Ended with exit code 0 [2021-11-23 02:09:45,480 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (45)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:45,678 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:45,678 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:09:45,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:45,679 INFO L85 PathProgramCache]: Analyzing trace with hash 105294, now seen corresponding path program 1 times [2021-11-23 02:09:45,679 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:09:45,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [564096318] [2021-11-23 02:09:45,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:45,679 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:09:45,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:09:45,681 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:09:45,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-23 02:09:45,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:45,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:09:45,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:45,779 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 13 treesize of output 12 [2021-11-23 02:09:48,484 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:09:48,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:49,943 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:09:49,944 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:09:49,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [564096318] [2021-11-23 02:09:49,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [564096318] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:49,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1910858494] [2021-11-23 02:09:49,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:49,944 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:09:49,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:09:49,945 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:09:49,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2021-11-23 02:09:50,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:50,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 02:09:50,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:50,112 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 02:09:51,247 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 02:09:51,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:53,151 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 02:09:53,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1910858494] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:53,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [137609059] [2021-11-23 02:09:53,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:53,151 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:53,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:53,152 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:53,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-23 02:09:53,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:53,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:09:53,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:53,234 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 13 treesize of output 12 [2021-11-23 02:09:53,793 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:09:53,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:54,495 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:09:54,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [137609059] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:54,496 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:09:54,496 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 11, 10, 7, 6] total 27 [2021-11-23 02:09:54,496 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695921262] [2021-11-23 02:09:54,496 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:54,497 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 02:09:54,497 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:09:54,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 02:09:54,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=631, Unknown=0, NotChecked=0, Total=756 [2021-11-23 02:09:54,498 INFO L87 Difference]: Start difference. First operand 149 states and 173 transitions. Second operand has 28 states, 27 states have (on average 4.296296296296297) internal successors, (116), 28 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:56,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:56,490 INFO L93 Difference]: Finished difference Result 189 states and 216 transitions. [2021-11-23 02:09:56,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 02:09:56,491 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 4.296296296296297) internal successors, (116), 28 states have internal predecessors, (116), 0 states have call successors, (0), 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 02:09:56,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:56,492 INFO L225 Difference]: With dead ends: 189 [2021-11-23 02:09:56,493 INFO L226 Difference]: Without dead ends: 189 [2021-11-23 02:09:56,493 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 219 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 341 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=207, Invalid=1125, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:09:56,494 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 106 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 86 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:56,494 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 225 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 160 Invalid, 0 Unknown, 86 Unchecked, 1.0s Time] [2021-11-23 02:09:56,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-11-23 02:09:56,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 154. [2021-11-23 02:09:56,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 149 states have (on average 1.2013422818791946) internal successors, (179), 153 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 02:09:56,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 179 transitions. [2021-11-23 02:09:56,500 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 179 transitions. Word has length 41 [2021-11-23 02:09:56,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:56,501 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 179 transitions. [2021-11-23 02:09:56,501 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 4.296296296296297) internal successors, (116), 28 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:09:56,501 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 179 transitions. [2021-11-23 02:09:56,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 02:09:56,502 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:56,502 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:56,529 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:56,709 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (48)] Ended with exit code 0 [2021-11-23 02:09:56,916 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (47)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:57,108 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:09:57,109 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:09:57,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:57,109 INFO L85 PathProgramCache]: Analyzing trace with hash -464583823, now seen corresponding path program 1 times [2021-11-23 02:09:57,109 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:09:57,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1218254615] [2021-11-23 02:09:57,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:57,110 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:09:57,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:09:57,110 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:09:57,112 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (50)] Waiting until timeout for monitored process [2021-11-23 02:09:57,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:57,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:09:57,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:57,197 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 13 treesize of output 12 [2021-11-23 02:09:57,919 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:09:57,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:00,005 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:00,005 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:10:00,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1218254615] [2021-11-23 02:10:00,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1218254615] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:00,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [349611880] [2021-11-23 02:10:00,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:00,006 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:10:00,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:10:00,015 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:10:00,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (51)] Waiting until timeout for monitored process [2021-11-23 02:10:00,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:00,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 02:10:00,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:00,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2021-11-23 02:10:01,736 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:01,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:03,816 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:03,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [349611880] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:03,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568887053] [2021-11-23 02:10:03,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:03,816 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:03,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:10:03,817 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:10:03,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-23 02:10:03,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:03,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:10:03,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:03,893 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2021-11-23 02:10:04,468 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:04,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:05,598 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:05,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [568887053] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:05,599 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:10:05,599 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 12, 11, 8, 7] total 30 [2021-11-23 02:10:05,599 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691783206] [2021-11-23 02:10:05,599 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:10:05,599 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-23 02:10:05,599 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:10:05,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-23 02:10:05,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=793, Unknown=0, NotChecked=0, Total=930 [2021-11-23 02:10:05,600 INFO L87 Difference]: Start difference. First operand 154 states and 179 transitions. Second operand has 31 states, 30 states have (on average 4.166666666666667) internal successors, (125), 31 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:07,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:07,469 INFO L93 Difference]: Finished difference Result 198 states and 231 transitions. [2021-11-23 02:10:07,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 02:10:07,470 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 4.166666666666667) internal successors, (125), 31 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-23 02:10:07,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:07,472 INFO L225 Difference]: With dead ends: 198 [2021-11-23 02:10:07,472 INFO L226 Difference]: Without dead ends: 198 [2021-11-23 02:10:07,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 227 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=215, Invalid=1191, Unknown=0, NotChecked=0, Total=1406 [2021-11-23 02:10:07,474 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 114 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 349 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 99 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:07,474 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 349 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 163 Invalid, 0 Unknown, 99 Unchecked, 1.1s Time] [2021-11-23 02:10:07,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-11-23 02:10:07,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 160. [2021-11-23 02:10:07,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 155 states have (on average 1.2) internal successors, (186), 159 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:07,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 186 transitions. [2021-11-23 02:10:07,479 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 186 transitions. Word has length 43 [2021-11-23 02:10:07,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:07,480 INFO L470 AbstractCegarLoop]: Abstraction has 160 states and 186 transitions. [2021-11-23 02:10:07,480 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 4.166666666666667) internal successors, (125), 31 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:07,480 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 186 transitions. [2021-11-23 02:10:07,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 02:10:07,481 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:07,481 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:07,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (50)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:07,695 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (51)] Ended with exit code 0 [2021-11-23 02:10:07,915 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2021-11-23 02:10:08,094 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:08,095 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:10:08,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:08,095 INFO L85 PathProgramCache]: Analyzing trace with hash -1517190569, now seen corresponding path program 1 times [2021-11-23 02:10:08,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:10:08,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1419238414] [2021-11-23 02:10:08,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:08,095 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:10:08,096 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:10:08,096 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:10:08,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2021-11-23 02:10:08,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:08,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:10:08,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:08,257 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:08,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:08,388 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:08,389 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:10:08,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1419238414] [2021-11-23 02:10:08,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1419238414] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:08,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [572881347] [2021-11-23 02:10:08,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:08,392 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:10:08,393 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:10:08,393 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:10:08,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (54)] Waiting until timeout for monitored process [2021-11-23 02:10:08,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:08,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:10:08,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:08,590 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:08,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:08,717 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:08,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [572881347] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:08,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [38914684] [2021-11-23 02:10:08,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:08,717 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:08,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:10:08,720 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:10:08,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-23 02:10:08,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:08,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:10:08,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:08,944 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:08,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:09,256 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:09,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [38914684] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:09,257 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:10:09,257 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 8, 9] total 16 [2021-11-23 02:10:09,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489702315] [2021-11-23 02:10:09,257 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:10:09,257 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 02:10:09,257 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:10:09,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 02:10:09,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-11-23 02:10:09,258 INFO L87 Difference]: Start difference. First operand 160 states and 186 transitions. Second operand has 16 states, 16 states have (on average 5.0) internal successors, (80), 16 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:12,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:12,128 INFO L93 Difference]: Finished difference Result 466 states and 510 transitions. [2021-11-23 02:10:12,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-23 02:10:12,133 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 5.0) internal successors, (80), 16 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-23 02:10:12,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:12,136 INFO L225 Difference]: With dead ends: 466 [2021-11-23 02:10:12,136 INFO L226 Difference]: Without dead ends: 466 [2021-11-23 02:10:12,138 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 244 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1487 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=862, Invalid=3560, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 02:10:12,139 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 757 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 507 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 757 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 633 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:12,141 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [757 Valid, 197 Invalid, 633 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 507 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-23 02:10:12,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2021-11-23 02:10:12,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 275. [2021-11-23 02:10:12,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 270 states have (on average 1.2555555555555555) internal successors, (339), 274 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:12,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 339 transitions. [2021-11-23 02:10:12,166 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 339 transitions. Word has length 44 [2021-11-23 02:10:12,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:12,166 INFO L470 AbstractCegarLoop]: Abstraction has 275 states and 339 transitions. [2021-11-23 02:10:12,167 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 5.0) internal successors, (80), 16 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:12,167 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 339 transitions. [2021-11-23 02:10:12,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 02:10:12,167 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:12,168 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:12,182 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (53)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:12,399 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2021-11-23 02:10:12,580 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (54)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:12,779 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:10:12,779 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:10:12,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:12,780 INFO L85 PathProgramCache]: Analyzing trace with hash -1158163465, now seen corresponding path program 2 times [2021-11-23 02:10:12,780 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:10:12,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1962786103] [2021-11-23 02:10:12,780 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:10:12,780 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:10:12,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:10:12,781 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:10:12,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-23 02:10:12,842 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-23 02:10:12,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:10:12,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:10:12,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:12,860 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 02:10:13,699 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:10:13,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:17,649 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:10:17,649 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:10:17,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1962786103] [2021-11-23 02:10:17,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1962786103] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:17,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1637697097] [2021-11-23 02:10:17,650 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:10:17,650 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:10:17,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:10:17,651 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:10:17,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (57)] Waiting until timeout for monitored process [2021-11-23 02:10:17,738 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-23 02:10:17,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:10:17,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 02:10:17,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:17,750 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 02:10:18,867 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:10:18,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:19,207 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:10:19,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1637697097] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:10:19,207 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:10:19,207 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 10, 9] total 21 [2021-11-23 02:10:19,207 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230342771] [2021-11-23 02:10:19,208 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:10:19,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:10:19,208 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:10:19,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:10:19,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2021-11-23 02:10:19,209 INFO L87 Difference]: Start difference. First operand 275 states and 339 transitions. Second operand has 7 states, 6 states have (on average 5.666666666666667) internal successors, (34), 7 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:22,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:22,038 INFO L93 Difference]: Finished difference Result 295 states and 358 transitions. [2021-11-23 02:10:22,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:10:22,040 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 5.666666666666667) internal successors, (34), 7 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-23 02:10:22,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:22,042 INFO L225 Difference]: With dead ends: 295 [2021-11-23 02:10:22,042 INFO L226 Difference]: Without dead ends: 295 [2021-11-23 02:10:22,043 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 151 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=140, Invalid=562, Unknown=0, NotChecked=0, Total=702 [2021-11-23 02:10:22,044 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 49 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:22,044 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 57 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 02:10:22,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2021-11-23 02:10:22,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 286. [2021-11-23 02:10:22,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 281 states have (on average 1.2384341637010676) internal successors, (348), 285 states have internal predecessors, (348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:22,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 348 transitions. [2021-11-23 02:10:22,054 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 348 transitions. Word has length 44 [2021-11-23 02:10:22,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:22,055 INFO L470 AbstractCegarLoop]: Abstraction has 286 states and 348 transitions. [2021-11-23 02:10:22,055 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 5.666666666666667) internal successors, (34), 7 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:22,055 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 348 transitions. [2021-11-23 02:10:22,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 02:10:22,056 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:22,056 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:22,068 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (56)] Ended with exit code 0 [2021-11-23 02:10:22,272 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (57)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:22,468 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:10:22,468 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:10:22,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:22,468 INFO L85 PathProgramCache]: Analyzing trace with hash -2032053004, now seen corresponding path program 1 times [2021-11-23 02:10:22,469 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:10:22,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1309010435] [2021-11-23 02:10:22,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:22,469 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:10:22,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:10:22,473 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:10:22,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (58)] Waiting until timeout for monitored process [2021-11-23 02:10:22,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:22,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:10:22,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:22,555 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 13 treesize of output 12 [2021-11-23 02:10:25,336 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:25,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:26,917 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:26,917 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:10:26,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1309010435] [2021-11-23 02:10:26,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1309010435] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:26,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [736275415] [2021-11-23 02:10:26,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:26,918 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:10:26,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:10:26,919 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:10:26,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (59)] Waiting until timeout for monitored process [2021-11-23 02:10:27,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:27,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 02:10:27,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:27,107 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 02:10:28,521 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:28,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:30,655 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:30,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [736275415] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:30,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [318889031] [2021-11-23 02:10:30,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:30,655 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:30,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:10:30,656 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:10:30,657 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-23 02:10:30,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:30,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:10:30,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:30,735 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 13 treesize of output 12 [2021-11-23 02:10:31,372 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:31,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:34,694 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:34,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [318889031] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:34,695 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:10:34,695 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 12, 11, 8, 8] total 36 [2021-11-23 02:10:34,695 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826530851] [2021-11-23 02:10:34,695 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:10:34,696 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-23 02:10:34,696 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:10:34,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-23 02:10:34,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1147, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:10:34,697 INFO L87 Difference]: Start difference. First operand 286 states and 348 transitions. Second operand has 37 states, 36 states have (on average 4.611111111111111) internal successors, (166), 37 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:44,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:44,601 INFO L93 Difference]: Finished difference Result 455 states and 541 transitions. [2021-11-23 02:10:44,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-23 02:10:44,604 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 4.611111111111111) internal successors, (166), 37 states have internal predecessors, (166), 0 states have call successors, (0), 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 46 [2021-11-23 02:10:44,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:44,606 INFO L225 Difference]: With dead ends: 455 [2021-11-23 02:10:44,606 INFO L226 Difference]: Without dead ends: 455 [2021-11-23 02:10:44,608 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 243 SyntacticMatches, 5 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 836 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=384, Invalid=2586, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 02:10:44,609 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 182 mSDsluCounter, 515 mSDsCounter, 0 mSdLazyCounter, 356 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 551 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 112 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:44,609 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [182 Valid, 551 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 356 Invalid, 0 Unknown, 112 Unchecked, 3.6s Time] [2021-11-23 02:10:44,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2021-11-23 02:10:44,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 348. [2021-11-23 02:10:44,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 348 states, 343 states have (on average 1.2419825072886297) internal successors, (426), 347 states have internal predecessors, (426), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:44,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 426 transitions. [2021-11-23 02:10:44,620 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 426 transitions. Word has length 46 [2021-11-23 02:10:44,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:44,621 INFO L470 AbstractCegarLoop]: Abstraction has 348 states and 426 transitions. [2021-11-23 02:10:44,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 4.611111111111111) internal successors, (166), 37 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:44,621 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 426 transitions. [2021-11-23 02:10:44,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 02:10:44,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:44,622 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:44,651 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (58)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:44,873 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:45,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (59)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:45,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:10:45,235 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:10:45,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:45,236 INFO L85 PathProgramCache]: Analyzing trace with hash 1430867868, now seen corresponding path program 1 times [2021-11-23 02:10:45,236 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:10:45,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1331013457] [2021-11-23 02:10:45,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:45,236 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:10:45,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:10:45,237 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:10:45,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (61)] Waiting until timeout for monitored process [2021-11-23 02:10:45,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:45,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:10:45,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:45,336 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 13 treesize of output 12 [2021-11-23 02:10:46,876 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:46,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:48,530 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:48,530 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:10:48,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1331013457] [2021-11-23 02:10:48,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1331013457] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:48,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [191831580] [2021-11-23 02:10:48,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:48,530 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:10:48,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:10:48,532 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:10:48,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (62)] Waiting until timeout for monitored process [2021-11-23 02:10:48,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:48,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 02:10:48,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:48,706 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 02:10:49,959 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:49,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:52,083 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:52,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [191831580] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:52,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44865161] [2021-11-23 02:10:52,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:52,084 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:52,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:10:52,085 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:10:52,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-23 02:10:52,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:52,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:10:52,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:52,169 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 13 treesize of output 12 [2021-11-23 02:10:52,821 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:52,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:56,077 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:56,078 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [44865161] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:56,078 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:10:56,078 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 12, 11, 8, 8] total 36 [2021-11-23 02:10:56,078 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140479659] [2021-11-23 02:10:56,078 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:10:56,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-23 02:10:56,079 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:10:56,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-23 02:10:56,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1147, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:10:56,080 INFO L87 Difference]: Start difference. First operand 348 states and 426 transitions. Second operand has 37 states, 36 states have (on average 4.694444444444445) internal successors, (169), 37 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:04,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:04,163 INFO L93 Difference]: Finished difference Result 441 states and 515 transitions. [2021-11-23 02:11:04,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-23 02:11:04,164 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 4.694444444444445) internal successors, (169), 37 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-23 02:11:04,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:04,166 INFO L225 Difference]: With dead ends: 441 [2021-11-23 02:11:04,166 INFO L226 Difference]: Without dead ends: 441 [2021-11-23 02:11:04,167 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 247 SyntacticMatches, 4 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 754 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=358, Invalid=2398, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 02:11:04,168 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 194 mSDsluCounter, 472 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 505 SdHoareTripleChecker+Invalid, 530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 112 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:04,168 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 505 Invalid, 530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 386 Invalid, 0 Unknown, 112 Unchecked, 4.2s Time] [2021-11-23 02:11:04,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2021-11-23 02:11:04,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 293. [2021-11-23 02:11:04,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 290 states have (on average 1.193103448275862) internal successors, (346), 292 states have internal predecessors, (346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:04,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 346 transitions. [2021-11-23 02:11:04,177 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 346 transitions. Word has length 47 [2021-11-23 02:11:04,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:04,178 INFO L470 AbstractCegarLoop]: Abstraction has 293 states and 346 transitions. [2021-11-23 02:11:04,178 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 4.694444444444445) internal successors, (169), 37 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:04,178 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 346 transitions. [2021-11-23 02:11:04,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 02:11:04,179 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:04,179 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:04,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (62)] Forceful destruction successful, exit code 0 [2021-11-23 02:11:04,388 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (61)] Ended with exit code 0 [2021-11-23 02:11:04,602 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Ended with exit code 0 [2021-11-23 02:11:04,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:11:04,781 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:11:04,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:04,782 INFO L85 PathProgramCache]: Analyzing trace with hash 1288075469, now seen corresponding path program 3 times [2021-11-23 02:11:04,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:11:04,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1777422500] [2021-11-23 02:11:04,782 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:11:04,782 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:11:04,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:11:04,783 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:11:04,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (64)] Waiting until timeout for monitored process [2021-11-23 02:11:04,852 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:11:04,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:11:04,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 02:11:04,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:04,869 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 02:11:06,209 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 02:11:06,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:21,850 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 02:11:21,850 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:11:21,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1777422500] [2021-11-23 02:11:21,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1777422500] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:11:21,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1712488272] [2021-11-23 02:11:21,851 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:11:21,851 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:11:21,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:11:21,852 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:11:21,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (65)] Waiting until timeout for monitored process [2021-11-23 02:11:21,950 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:11:21,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:11:21,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 02:11:21,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:21,964 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 02:11:22,866 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 02:11:22,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:34,905 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 02:11:34,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1712488272] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:11:34,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1406764110] [2021-11-23 02:11:34,906 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:11:34,906 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:11:34,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:11:34,907 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:11:34,908 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-23 02:11:35,006 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:11:35,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:11:35,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 02:11:35,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:35,024 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 02:11:35,848 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 02:11:35,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:51,508 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-23 02:11:51,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1406764110] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:11:51,509 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:11:51,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 10, 10, 11, 11] total 30 [2021-11-23 02:11:51,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442579412] [2021-11-23 02:11:51,509 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:11:51,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-23 02:11:51,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:11:51,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-23 02:11:51,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=729, Unknown=1, NotChecked=0, Total=930 [2021-11-23 02:11:51,510 INFO L87 Difference]: Start difference. First operand 293 states and 346 transitions. Second operand has 31 states, 30 states have (on average 2.6666666666666665) internal successors, (80), 31 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:55,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:55,860 INFO L93 Difference]: Finished difference Result 327 states and 378 transitions. [2021-11-23 02:11:55,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 02:11:55,861 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 2.6666666666666665) internal successors, (80), 31 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-23 02:11:55,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:55,863 INFO L225 Difference]: With dead ends: 327 [2021-11-23 02:11:55,863 INFO L226 Difference]: Without dead ends: 327 [2021-11-23 02:11:55,863 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 262 SyntacticMatches, 3 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 519 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=542, Invalid=1349, Unknown=1, NotChecked=0, Total=1892 [2021-11-23 02:11:55,864 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 302 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 302 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 90 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:55,865 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [302 Valid, 112 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 165 Invalid, 0 Unknown, 90 Unchecked, 1.7s Time] [2021-11-23 02:11:55,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2021-11-23 02:11:55,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 308. [2021-11-23 02:11:55,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 305 states have (on average 1.1770491803278689) internal successors, (359), 307 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:55,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 359 transitions. [2021-11-23 02:11:55,873 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 359 transitions. Word has length 50 [2021-11-23 02:11:55,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:55,874 INFO L470 AbstractCegarLoop]: Abstraction has 308 states and 359 transitions. [2021-11-23 02:11:55,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 2.6666666666666665) internal successors, (80), 31 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:55,874 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 359 transitions. [2021-11-23 02:11:55,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 02:11:55,875 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:55,875 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:55,913 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2021-11-23 02:11:56,101 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (65)] Forceful destruction successful, exit code 0 [2021-11-23 02:11:56,307 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (64)] Ended with exit code 0 [2021-11-23 02:11:56,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:11:56,501 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:11:56,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:56,501 INFO L85 PathProgramCache]: Analyzing trace with hash -1956944587, now seen corresponding path program 2 times [2021-11-23 02:11:56,501 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:11:56,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1733501670] [2021-11-23 02:11:56,502 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:11:56,502 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:11:56,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:11:56,502 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:11:56,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (67)] Waiting until timeout for monitored process [2021-11-23 02:11:56,569 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:11:56,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:11:56,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:11:56,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:56,609 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 13 treesize of output 12 [2021-11-23 02:11:57,732 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:11:57,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:02,326 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:12:02,327 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:12:02,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1733501670] [2021-11-23 02:12:02,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1733501670] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:12:02,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1061575380] [2021-11-23 02:12:02,327 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:12:02,327 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:12:02,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:12:02,328 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:12:02,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (68)] Waiting until timeout for monitored process [2021-11-23 02:12:02,489 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:12:02,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:12:02,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:12:02,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:02,514 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 02:12:04,605 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 02:12:04,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:15,483 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 02:12:15,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1061575380] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:12:15,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1337668756] [2021-11-23 02:12:15,483 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:12:15,483 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:15,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:15,484 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:15,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2021-11-23 02:12:15,548 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:12:15,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:12:15,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:12:15,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:15,566 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 13 treesize of output 12 [2021-11-23 02:12:16,517 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:12:16,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:20,122 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:12:20,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1337668756] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:12:20,122 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:12:20,122 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13, 13, 8, 7] total 41 [2021-11-23 02:12:20,123 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915708939] [2021-11-23 02:12:20,123 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:12:20,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-23 02:12:20,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:12:20,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-23 02:12:20,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=1474, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 02:12:20,124 INFO L87 Difference]: Start difference. First operand 308 states and 359 transitions. Second operand has 42 states, 41 states have (on average 4.682926829268292) internal successors, (192), 42 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:12:29,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:29,581 INFO L93 Difference]: Finished difference Result 366 states and 417 transitions. [2021-11-23 02:12:29,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-23 02:12:29,583 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 4.682926829268292) internal successors, (192), 42 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-23 02:12:29,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:29,585 INFO L225 Difference]: With dead ends: 366 [2021-11-23 02:12:29,585 INFO L226 Difference]: Without dead ends: 366 [2021-11-23 02:12:29,586 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 264 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1087 ImplicationChecksByTransitivity, 18.3s TimeCoverageRelationStatistics Valid=472, Invalid=3068, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 02:12:29,586 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 83 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 102 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:29,587 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 302 Invalid, 393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 277 Invalid, 0 Unknown, 102 Unchecked, 2.1s Time] [2021-11-23 02:12:29,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2021-11-23 02:12:29,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 302. [2021-11-23 02:12:29,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 299 states have (on average 1.173913043478261) internal successors, (351), 301 states have internal predecessors, (351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:12:29,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 351 transitions. [2021-11-23 02:12:29,594 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 351 transitions. Word has length 50 [2021-11-23 02:12:29,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:29,595 INFO L470 AbstractCegarLoop]: Abstraction has 302 states and 351 transitions. [2021-11-23 02:12:29,595 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 4.682926829268292) internal successors, (192), 42 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:12:29,595 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 351 transitions. [2021-11-23 02:12:29,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 02:12:29,596 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:29,596 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:12:29,613 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (67)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:29,809 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (68)] Ended with exit code 0 [2021-11-23 02:12:30,029 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Ended with exit code 0 [2021-11-23 02:12:30,208 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:30,208 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:12:30,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:30,209 INFO L85 PathProgramCache]: Analyzing trace with hash 537492722, now seen corresponding path program 2 times [2021-11-23 02:12:30,209 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:12:30,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1332235058] [2021-11-23 02:12:30,209 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:12:30,209 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:12:30,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:12:30,210 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:12:30,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (70)] Waiting until timeout for monitored process [2021-11-23 02:12:30,256 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-23 02:12:30,256 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:12:30,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:12:30,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:30,274 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 02:12:31,276 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 02:12:31,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:47,717 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 02:12:47,717 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:12:47,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1332235058] [2021-11-23 02:12:47,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1332235058] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:12:47,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [971991078] [2021-11-23 02:12:47,717 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:12:47,718 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:12:47,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:12:47,718 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:12:47,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (71)] Waiting until timeout for monitored process [2021-11-23 02:12:47,801 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-23 02:12:47,801 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:12:47,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:12:47,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:47,817 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 02:12:49,450 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 02:12:49,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:54,309 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 02:12:54,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [971991078] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:12:54,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [427936196] [2021-11-23 02:12:54,309 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:12:54,309 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:54,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:54,310 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:54,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2021-11-23 02:12:54,387 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-23 02:12:54,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:12:54,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:12:54,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:54,401 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 02:12:55,181 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 02:12:55,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:11,447 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 02:13:11,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [427936196] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:13:11,447 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:13:11,447 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 24 [2021-11-23 02:13:11,447 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493233041] [2021-11-23 02:13:11,447 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:13:11,448 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 02:13:11,448 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:13:11,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 02:13:11,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=508, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:13:11,448 INFO L87 Difference]: Start difference. First operand 302 states and 351 transitions. Second operand has 25 states, 24 states have (on average 3.0833333333333335) internal successors, (74), 25 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 02:13:12,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:13:12,911 INFO L93 Difference]: Finished difference Result 302 states and 350 transitions. [2021-11-23 02:13:12,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:13:12,912 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.0833333333333335) internal successors, (74), 25 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) Word has length 54 [2021-11-23 02:13:12,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:13:12,914 INFO L225 Difference]: With dead ends: 302 [2021-11-23 02:13:12,914 INFO L226 Difference]: Without dead ends: 302 [2021-11-23 02:13:12,914 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 294 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=175, Invalid=817, Unknown=0, NotChecked=0, Total=992 [2021-11-23 02:13:12,915 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 22 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 64 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:13:12,915 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 111 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 53 Invalid, 0 Unknown, 64 Unchecked, 0.4s Time] [2021-11-23 02:13:12,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2021-11-23 02:13:12,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 257. [2021-11-23 02:13:12,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 254 states have (on average 1.1771653543307086) internal successors, (299), 256 states have internal predecessors, (299), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:13:12,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 299 transitions. [2021-11-23 02:13:12,922 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 299 transitions. Word has length 54 [2021-11-23 02:13:12,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:13:12,922 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 299 transitions. [2021-11-23 02:13:12,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.0833333333333335) internal successors, (74), 25 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 02:13:12,922 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 299 transitions. [2021-11-23 02:13:12,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-23 02:13:12,923 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:13:12,923 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:13:12,940 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (71)] Ended with exit code 0 [2021-11-23 02:13:13,143 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Ended with exit code 0 [2021-11-23 02:13:13,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (70)] Forceful destruction successful, exit code 0 [2021-11-23 02:13:13,524 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:13:13,524 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:13:13,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:13:13,524 INFO L85 PathProgramCache]: Analyzing trace with hash -553725830, now seen corresponding path program 1 times [2021-11-23 02:13:13,525 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:13:13,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1803337186] [2021-11-23 02:13:13,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:13,525 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:13:13,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:13:13,526 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:13:13,529 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (73)] Waiting until timeout for monitored process [2021-11-23 02:13:13,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:13,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:13:13,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:13,841 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 17 proven. 45 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:13:13,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:14,144 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 17 proven. 45 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:13:14,144 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:13:14,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1803337186] [2021-11-23 02:13:14,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1803337186] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:13:14,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1656026762] [2021-11-23 02:13:14,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:14,144 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:13:14,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:13:14,145 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:13:14,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (74)] Waiting until timeout for monitored process [2021-11-23 02:13:14,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:14,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:13:14,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:15,208 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 40 proven. 27 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:13:15,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:16,085 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 40 proven. 27 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:13:16,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1656026762] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:13:16,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1525517946] [2021-11-23 02:13:16,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:16,085 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:13:16,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:13:16,086 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:13:16,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2021-11-23 02:13:16,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:13:16,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:13:16,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:16,723 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 17 proven. 45 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:13:16,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:17,084 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 46 proven. 4 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-23 02:13:17,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1525517946] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:13:17,085 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:13:17,085 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11, 10, 12, 9] total 38 [2021-11-23 02:13:17,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550746040] [2021-11-23 02:13:17,085 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:13:17,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-23 02:13:17,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:13:17,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-23 02:13:17,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=1200, Unknown=0, NotChecked=0, Total=1406 [2021-11-23 02:13:17,087 INFO L87 Difference]: Start difference. First operand 257 states and 299 transitions. Second operand has 38 states, 38 states have (on average 5.578947368421052) internal successors, (212), 38 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:13:23,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:13:23,039 INFO L93 Difference]: Finished difference Result 391 states and 433 transitions. [2021-11-23 02:13:23,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-23 02:13:23,040 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 5.578947368421052) internal successors, (212), 38 states have internal predecessors, (212), 0 states have call successors, (0), 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 58 [2021-11-23 02:13:23,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:13:23,041 INFO L225 Difference]: With dead ends: 391 [2021-11-23 02:13:23,041 INFO L226 Difference]: Without dead ends: 384 [2021-11-23 02:13:23,043 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 334 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1826 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=1210, Invalid=5596, Unknown=0, NotChecked=0, Total=6806 [2021-11-23 02:13:23,044 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 1478 mSDsluCounter, 554 mSDsCounter, 0 mSdLazyCounter, 1383 mSolverCounterSat, 265 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1478 SdHoareTripleChecker+Valid, 583 SdHoareTripleChecker+Invalid, 1648 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 265 IncrementalHoareTripleChecker+Valid, 1383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:13:23,045 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1478 Valid, 583 Invalid, 1648 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [265 Valid, 1383 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2021-11-23 02:13:23,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 384 states. [2021-11-23 02:13:23,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 384 to 292. [2021-11-23 02:13:23,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 290 states have (on average 1.1379310344827587) internal successors, (330), 291 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:13:23,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 330 transitions. [2021-11-23 02:13:23,053 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 330 transitions. Word has length 58 [2021-11-23 02:13:23,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:13:23,054 INFO L470 AbstractCegarLoop]: Abstraction has 292 states and 330 transitions. [2021-11-23 02:13:23,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 5.578947368421052) internal successors, (212), 38 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:13:23,054 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 330 transitions. [2021-11-23 02:13:23,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 02:13:23,055 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:13:23,056 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:13:23,096 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (73)] Ended with exit code 0 [2021-11-23 02:13:23,308 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Forceful destruction successful, exit code 0 [2021-11-23 02:13:23,482 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (74)] Ended with exit code 0 [2021-11-23 02:13:23,681 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:13:23,681 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:13:23,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:13:23,681 INFO L85 PathProgramCache]: Analyzing trace with hash 1833407633, now seen corresponding path program 2 times [2021-11-23 02:13:23,682 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:13:23,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1058851953] [2021-11-23 02:13:23,682 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:13:23,682 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:13:23,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:13:23,683 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:13:23,689 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (76)] Waiting until timeout for monitored process [2021-11-23 02:13:23,766 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:13:23,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:13:23,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:13:23,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:23,973 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:13:23,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:24,282 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:13:24,283 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:13:24,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1058851953] [2021-11-23 02:13:24,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1058851953] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:13:24,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2085199691] [2021-11-23 02:13:24,283 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:13:24,283 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:13:24,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:13:24,284 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:13:24,285 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (77)] Waiting until timeout for monitored process [2021-11-23 02:13:24,446 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:13:24,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:13:24,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:13:24,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:24,487 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 02:13:25,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-23 02:13:25,505 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 28 proven. 43 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:13:25,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:26,437 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:13:26,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2085199691] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:13:26,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449543092] [2021-11-23 02:13:26,438 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 02:13:26,438 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:13:26,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:13:26,439 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:13:26,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2021-11-23 02:13:26,521 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 02:13:26,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:13:26,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:13:26,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:26,555 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 13 treesize of output 12 [2021-11-23 02:13:28,331 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:13:28,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:30,165 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 16 proven. 41 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:13:30,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [449543092] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:13:30,165 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:13:30,165 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 15, 9, 11, 9] total 38 [2021-11-23 02:13:30,166 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538128513] [2021-11-23 02:13:30,166 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:13:30,166 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-23 02:13:30,166 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:13:30,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-23 02:13:30,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1237, Unknown=0, NotChecked=0, Total=1406 [2021-11-23 02:13:30,167 INFO L87 Difference]: Start difference. First operand 292 states and 330 transitions. Second operand has 38 states, 38 states have (on average 5.421052631578948) internal successors, (206), 38 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:13:31,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:13:31,991 INFO L93 Difference]: Finished difference Result 354 states and 393 transitions. [2021-11-23 02:13:31,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 02:13:31,993 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 5.421052631578948) internal successors, (206), 38 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-23 02:13:31,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:13:31,994 INFO L225 Difference]: With dead ends: 354 [2021-11-23 02:13:31,994 INFO L226 Difference]: Without dead ends: 329 [2021-11-23 02:13:31,995 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 369 GetRequests, 325 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 524 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=224, Invalid=1668, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 02:13:31,995 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 67 mSDsluCounter, 473 mSDsCounter, 0 mSdLazyCounter, 411 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 504 SdHoareTripleChecker+Invalid, 721 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 411 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 303 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:13:31,995 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 504 Invalid, 721 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 411 Invalid, 0 Unknown, 303 Unchecked, 1.2s Time] [2021-11-23 02:13:31,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2021-11-23 02:13:32,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 317. [2021-11-23 02:13:32,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 317 states, 315 states have (on average 1.1301587301587301) internal successors, (356), 316 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:13:32,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 356 transitions. [2021-11-23 02:13:32,003 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 356 transitions. Word has length 61 [2021-11-23 02:13:32,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:13:32,003 INFO L470 AbstractCegarLoop]: Abstraction has 317 states and 356 transitions. [2021-11-23 02:13:32,004 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 5.421052631578948) internal successors, (206), 38 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:13:32,004 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 356 transitions. [2021-11-23 02:13:32,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 02:13:32,005 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:13:32,005 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1, 1] [2021-11-23 02:13:32,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Forceful destruction successful, exit code 0 [2021-11-23 02:13:32,240 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (76)] Ended with exit code 0 [2021-11-23 02:13:32,434 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (77)] Ended with exit code 0 [2021-11-23 02:13:32,632 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:13:32,633 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:13:32,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:13:32,633 INFO L85 PathProgramCache]: Analyzing trace with hash 58542645, now seen corresponding path program 4 times [2021-11-23 02:13:32,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:13:32,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1691857575] [2021-11-23 02:13:32,633 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:13:32,633 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:13:32,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:13:32,634 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:13:32,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (79)] Waiting until timeout for monitored process [2021-11-23 02:13:32,717 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:13:32,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:13:32,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 02:13:32,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:32,746 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 02:13:35,187 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:13:35,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:48,781 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:13:48,781 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:13:48,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1691857575] [2021-11-23 02:13:48,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1691857575] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:13:48,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1443320626] [2021-11-23 02:13:48,781 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:13:48,781 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:13:48,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:13:48,782 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:13:48,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (80)] Waiting until timeout for monitored process [2021-11-23 02:13:48,970 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:13:48,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:13:48,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:13:48,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:48,999 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 02:13:51,026 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:13:51,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:14:03,932 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:03,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1443320626] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:14:03,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603739007] [2021-11-23 02:14:03,933 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:14:03,933 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:14:03,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:14:03,934 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:14:03,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-23 02:14:04,026 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:14:04,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:14:04,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 02:14:04,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:14:04,067 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 02:14:07,965 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:07,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:14:35,882 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:14:35,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [603739007] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:14:35,883 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:14:35,883 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 19, 19, 26, 26] total 105 [2021-11-23 02:14:35,883 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967968769] [2021-11-23 02:14:35,883 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:14:35,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2021-11-23 02:14:35,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:14:35,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-11-23 02:14:35,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2920, Invalid=8210, Unknown=0, NotChecked=0, Total=11130 [2021-11-23 02:14:35,888 INFO L87 Difference]: Start difference. First operand 317 states and 356 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 02:14:51,466 WARN L227 SmtUtils]: Spent 6.85s 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 02:14:53,720 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 02:14:55,723 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:14:57,726 WARN L534 Checker$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 02:14:59,733 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:01,856 WARN L534 Checker$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 02:15:03,859 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:05,862 WARN L534 Checker$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 02:15:07,866 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:19,936 WARN L227 SmtUtils]: Spent 5.93s on a formula simplification that was a NOOP. DAG size: 150 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:15:27,076 WARN L227 SmtUtils]: Spent 6.41s on a formula simplification that was a NOOP. DAG size: 147 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:15:29,381 WARN L534 Checker$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 02:15:31,384 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:33,387 WARN L534 Checker$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 02:15:35,390 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:37,579 WARN L534 Checker$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 02:15:39,629 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:41,632 WARN L534 Checker$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 02:15:43,703 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:15:50,095 WARN L227 SmtUtils]: Spent 5.91s on a formula simplification that was a NOOP. DAG size: 144 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:16:01,797 WARN L227 SmtUtils]: Spent 5.71s on a formula simplification that was a NOOP. DAG size: 137 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:16:04,192 WARN L534 Checker$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 02:16:06,205 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:16:08,208 WARN L534 Checker$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 02:16:10,243 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:16:12,289 WARN L534 Checker$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 02:16:14,292 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:16:16,295 WARN L534 Checker$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 02:16:32,936 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:16:34,939 WARN L534 Checker$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 02:16:37,001 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:16:39,005 WARN L534 Checker$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 02:16:41,008 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:16:43,010 WARN L534 Checker$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 02:16:45,014 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:16:57,626 WARN L534 Checker$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 02:16:59,630 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:01,633 WARN L534 Checker$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 02:17:03,661 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:05,665 WARN L534 Checker$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 02:17:07,717 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:18,284 WARN L534 Checker$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 02:17:20,288 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:22,291 WARN L534 Checker$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 02:17:24,295 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:26,298 WARN L534 Checker$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 02:17:28,365 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:38,014 WARN L534 Checker$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 02:17:40,082 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:42,085 WARN L534 Checker$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 02:17:43,579 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.49s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:45,627 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.96s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:53,925 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:17:55,928 WARN L534 Checker$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 02:17:57,963 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:18:00,067 WARN L534 Checker$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 02:18:07,689 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:18:09,692 WARN L534 Checker$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 02:18:11,695 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:18:18,371 WARN L534 Checker$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 02:18:20,374 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:18:21,938 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.56s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:18:27,865 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.68s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:18:29,868 WARN L534 Checker$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 02:18:34,862 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.51s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:18:44,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:44,155 INFO L93 Difference]: Finished difference Result 5556 states and 6260 transitions. [2021-11-23 02:18:44,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-23 02:18:44,157 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 02:18:44,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:44,177 INFO L225 Difference]: With dead ends: 5556 [2021-11-23 02:18:44,177 INFO L226 Difference]: Without dead ends: 5556 [2021-11-23 02:18:44,178 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 302 SyntacticMatches, 1 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8729 ImplicationChecksByTransitivity, 155.2s TimeCoverageRelationStatistics Valid=5768, Invalid=14824, Unknown=0, NotChecked=0, Total=20592 [2021-11-23 02:18:44,179 INFO L933 BasicCegarLoop]: 162 mSDtfsCounter, 8402 mSDsluCounter, 4733 mSDsCounter, 0 mSdLazyCounter, 4462 mSolverCounterSat, 210 mSolverCounterUnsat, 55 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 137.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8402 SdHoareTripleChecker+Valid, 4895 SdHoareTripleChecker+Invalid, 4908 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 210 IncrementalHoareTripleChecker+Valid, 4462 IncrementalHoareTripleChecker+Invalid, 55 IncrementalHoareTripleChecker+Unknown, 181 IncrementalHoareTripleChecker+Unchecked, 138.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:44,179 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8402 Valid, 4895 Invalid, 4908 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [210 Valid, 4462 Invalid, 55 Unknown, 181 Unchecked, 138.9s Time] [2021-11-23 02:18:44,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5556 states. [2021-11-23 02:18:44,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5556 to 381. [2021-11-23 02:18:44,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 381 states, 379 states have (on average 1.150395778364116) internal successors, (436), 380 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:44,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 381 states to 381 states and 436 transitions. [2021-11-23 02:18:44,251 INFO L78 Accepts]: Start accepts. Automaton has 381 states and 436 transitions. Word has length 66 [2021-11-23 02:18:44,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:44,252 INFO L470 AbstractCegarLoop]: Abstraction has 381 states and 436 transitions. [2021-11-23 02:18:44,252 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 02:18:44,252 INFO L276 IsEmpty]: Start isEmpty. Operand 381 states and 436 transitions. [2021-11-23 02:18:44,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 02:18:44,253 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:44,254 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:18:44,257 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (80)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:44,478 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Ended with exit code 0 [2021-11-23 02:18:44,665 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (79)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:44,856 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 02:18:44,856 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:18:44,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:44,857 INFO L85 PathProgramCache]: Analyzing trace with hash 22158437, now seen corresponding path program 3 times [2021-11-23 02:18:44,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:18:44,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1742376224] [2021-11-23 02:18:44,857 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:18:44,857 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:18:44,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:18:44,858 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:18:44,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (82)] Waiting until timeout for monitored process [2021-11-23 02:18:44,976 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:18:44,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:18:44,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 02:18:44,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:45,005 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 02:18:46,752 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:18:46,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:18:53,390 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:18:53,390 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:18:53,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1742376224] [2021-11-23 02:18:53,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1742376224] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:18:53,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [718136200] [2021-11-23 02:18:53,391 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:18:53,391 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:18:53,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:18:53,393 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:18:53,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (83)] Waiting until timeout for monitored process [2021-11-23 02:18:53,599 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:18:53,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:18:53,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:18:53,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:53,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2021-11-23 02:18:57,749 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:18:57,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:19:00,592 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:19:00,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [718136200] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:19:00,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552257776] [2021-11-23 02:19:00,592 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:19:00,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:19:00,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:19:00,593 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:19:00,594 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-23 02:19:01,067 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:19:01,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:19:01,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:19:01,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:19:01,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 12 [2021-11-23 02:19:02,441 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:19:02,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:19:12,511 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:19:12,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1552257776] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:19:12,511 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 02:19:12,512 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 10, 9, 10, 10] total 44 [2021-11-23 02:19:12,512 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429949486] [2021-11-23 02:19:12,512 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 02:19:12,513 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-23 02:19:12,513 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 02:19:12,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-23 02:19:12,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=1716, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 02:19:12,514 INFO L87 Difference]: Start difference. First operand 381 states and 436 transitions. Second operand has 45 states, 44 states have (on average 5.2727272727272725) internal successors, (232), 45 states have internal predecessors, (232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:20:16,728 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result VALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 02:20:24,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:20:24,052 INFO L93 Difference]: Finished difference Result 767 states and 864 transitions. [2021-11-23 02:20:24,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-23 02:20:24,053 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 44 states have (on average 5.2727272727272725) internal successors, (232), 45 states have internal predecessors, (232), 0 states have call successors, (0), 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 02:20:24,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:20:24,056 INFO L225 Difference]: With dead ends: 767 [2021-11-23 02:20:24,056 INFO L226 Difference]: Without dead ends: 767 [2021-11-23 02:20:24,058 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 363 SyntacticMatches, 8 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3797 ImplicationChecksByTransitivity, 67.4s TimeCoverageRelationStatistics Valid=1986, Invalid=10224, Unknown=0, NotChecked=0, Total=12210 [2021-11-23 02:20:24,058 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 543 mSDsluCounter, 633 mSDsCounter, 0 mSdLazyCounter, 999 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 543 SdHoareTripleChecker+Valid, 682 SdHoareTripleChecker+Invalid, 1658 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 999 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 577 IncrementalHoareTripleChecker+Unchecked, 16.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:20:24,058 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [543 Valid, 682 Invalid, 1658 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 999 Invalid, 0 Unknown, 577 Unchecked, 16.5s Time] [2021-11-23 02:20:24,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 767 states. [2021-11-23 02:20:24,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 767 to 533. [2021-11-23 02:20:24,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 533 states, 531 states have (on average 1.1581920903954803) internal successors, (615), 532 states have internal predecessors, (615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:20:24,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 533 states to 533 states and 615 transitions. [2021-11-23 02:20:24,072 INFO L78 Accepts]: Start accepts. Automaton has 533 states and 615 transitions. Word has length 66 [2021-11-23 02:20:24,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:20:24,073 INFO L470 AbstractCegarLoop]: Abstraction has 533 states and 615 transitions. [2021-11-23 02:20:24,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 44 states have (on average 5.2727272727272725) internal successors, (232), 45 states have internal predecessors, (232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:20:24,073 INFO L276 IsEmpty]: Start isEmpty. Operand 533 states and 615 transitions. [2021-11-23 02:20:24,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 02:20:24,074 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:20:24,074 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:20:24,100 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (82)] Forceful destruction successful, exit code 0 [2021-11-23 02:20:24,310 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Ended with exit code 0 [2021-11-23 02:20:24,489 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (83)] Forceful destruction successful, exit code 0 [2021-11-23 02:20:24,687 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 02:20:24,687 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 9 more)] === [2021-11-23 02:20:24,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:20:24,688 INFO L85 PathProgramCache]: Analyzing trace with hash -288322219, now seen corresponding path program 3 times [2021-11-23 02:20:24,688 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 02:20:24,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1351543515] [2021-11-23 02:20:24,688 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:20:24,689 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 02:20:24,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 02:20:24,690 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 02:20:24,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (85)] Waiting until timeout for monitored process [2021-11-23 02:20:24,863 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 02:20:24,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:20:24,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:20:24,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:20:24,891 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 13 treesize of output 12 [2021-11-23 02:20:29,600 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 23 proven. 57 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:20:29,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:20:33,791 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:20:33,791 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 02:20:33,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1351543515] [2021-11-23 02:20:33,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1351543515] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:20:33,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1337165570] [2021-11-23 02:20:33,792 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:20:33,792 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 02:20:33,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 02:20:33,793 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 02:20:33,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b428bf27-b0e3-4021-8645-1da4c8ea3c72/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (86)] Waiting until timeout for monitored process [2021-11-23 02:20:34,503 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 02:20:34,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:20:34,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 02:20:34,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:20:34,535 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